| 1 | |
| 2 | |
| 3 | * Copyright(c) 2007 Intel Corporation. All rights reserved.
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| 4 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
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| 5 | * Copyright(c) 2008 Mike Christie
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| 6 | *
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| 7 | * Maintained at www.Open-FCoE.org
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| 8 |
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| 9 |
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| 10 | |
| 11 | * Fibre Channel exchange and sequence handling.
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| 12 |
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| 13 |
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| 14 | #include <linux/timer.h>
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| 15 | #include <linux/slab.h>
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| 16 | #include <linux/err.h>
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| 17 | #include <linux/export.h>
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| 18 | #include <linux/log2.h>
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| 19 |
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| 20 | #include <scsi/fc/fc_fc2.h>
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| 21 |
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| 22 | #include <scsi/libfc.h>
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| 23 |
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| 24 | #include "fc_libfc.h"
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| 25 |
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| 26 | u16 fc_cpu_mask;
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| 27 | EXPORT_SYMBOL(fc_cpu_mask);
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| 28 | static u16 fc_cpu_order;
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| 29 | static struct kmem_cache *fc_em_cachep;
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| 30 | static struct workqueue_struct *fc_exch_workqueue;
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| 31 |
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| 32 | |
| 33 | * Structure and function definitions for managing Fibre Channel Exchanges
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| 34 | * and Sequences.
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| 35 | *
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| 36 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq.
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| 37 | *
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| 38 | * fc_exch_mgr holds the exchange state for an N port
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| 39 | *
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| 40 | * fc_exch holds state for one exchange and links to its active sequence.
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| 41 | *
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| 42 | * fc_seq holds the state for an individual sequence.
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| 43 |
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| 44 |
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| 45 | |
| 46 | * struct fc_exch_pool - Per cpu exchange pool
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| 47 | * @next_index: Next possible free exchange index
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| 48 | * @total_exches: Total allocated exchanges
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| 49 | * @lock: Exch pool lock
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| 50 | * @ex_list: List of exchanges
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| 51 | * @left: Cache of free slot in exch array
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| 52 | * @right: Cache of free slot in exch array
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| 53 | *
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| 54 | * This structure manages per cpu exchanges in array of exchange pointers.
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| 55 | * This array is allocated followed by struct fc_exch_pool memory for
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| 56 | * assigned range of exchanges to per cpu pool.
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| 57 |
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| 58 | struct fc_exch_pool {
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| 59 | spinlock_t lock;
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| 60 | struct list_head ex_list;
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| 61 | u16 next_index;
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| 62 | u16 total_exches;
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| 63 |
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| 64 | u16 left;
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| 65 | u16 right;
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| 66 | } ____cacheline_aligned_in_smp;
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| 67 |
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| 68 | |
| 69 | * struct fc_exch_mgr - The Exchange Manager (EM).
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| 70 | * @class: Default class for new sequences
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| 71 | * @kref: Reference counter
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| 72 | * @min_xid: Minimum exchange ID
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| 73 | * @max_xid: Maximum exchange ID
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| 74 | * @ep_pool: Reserved exchange pointers
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| 75 | * @pool_max_index: Max exch array index in exch pool
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| 76 | * @pool: Per cpu exch pool
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| 77 | * @lport: Local exchange port
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| 78 | * @stats: Statistics structure
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| 79 | *
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| 80 | * This structure is the center for creating exchanges and sequences.
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| 81 | * It manages the allocation of exchange IDs.
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| 82 |
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| 83 | struct fc_exch_mgr {
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| 84 | struct fc_exch_pool __percpu *pool;
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| 85 | mempool_t *ep_pool;
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| 86 | struct fc_lport *lport;
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| 87 | enum fc_class class;
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| 88 | struct kref kref;
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| 89 | u16 min_xid;
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| 90 | u16 max_xid;
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| 91 | u16 pool_max_index;
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| 92 |
|
| 93 | struct {
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| 94 | atomic_t no_free_exch;
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| 95 | atomic_t no_free_exch_xid;
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| 96 | atomic_t xid_not_found;
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| 97 | atomic_t xid_busy;
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| 98 | atomic_t seq_not_found;
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| 99 | atomic_t non_bls_resp;
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| 100 | } stats;
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| 101 | };
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| 102 |
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| 103 | |
| 104 | * struct fc_exch_mgr_anchor - primary structure for list of EMs
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| 105 | * @ema_list: Exchange Manager Anchor list
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| 106 | * @mp: Exchange Manager associated with this anchor
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| 107 | * @match: Routine to determine if this anchor's EM should be used
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| 108 | *
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| 109 | * When walking the list of anchors the match routine will be called
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| 110 | * for each anchor to determine if that EM should be used. The last
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| 111 | * anchor in the list will always match to handle any exchanges not
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| 112 | * handled by other EMs. The non-default EMs would be added to the
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| 113 | * anchor list by HW that provides offloads.
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| 114 |
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| 115 | struct fc_exch_mgr_anchor {
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| 116 | struct list_head ema_list;
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| 117 | struct fc_exch_mgr *mp;
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| 118 | bool (*match)(struct fc_frame *);
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| 119 | };
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| 120 |
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| 121 | static void fc_exch_rrq(struct fc_exch *);
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| 122 | static void fc_seq_ls_acc(struct fc_frame *);
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| 123 | static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason,
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| 124 | enum fc_els_rjt_explan);
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| 125 | static void fc_exch_els_rec(struct fc_frame *);
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| 126 | static void fc_exch_els_rrq(struct fc_frame *);
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| 127 |
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| 128 | |
| 129 | * Internal implementation notes.
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| 130 | *
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| 131 | * The exchange manager is one by default in libfc but LLD may choose
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| 132 | * to have one per CPU. The sequence manager is one per exchange manager
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| 133 | * and currently never separated.
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| 134 | *
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| 135 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
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| 136 | * assigned by the Sequence Initiator that shall be unique for a specific
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| 137 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't
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| 138 | * qualified by exchange ID, which one might think it would be.
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| 139 | * In practice this limits the number of open sequences and exchanges to 256
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| 140 | * per session. For most targets we could treat this limit as per exchange.
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| 141 | *
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| 142 | * The exchange and its sequence are freed when the last sequence is received.
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| 143 | * It's possible for the remote port to leave an exchange open without
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| 144 | * sending any sequences.
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| 145 | *
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| 146 | * Notes on reference counts:
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| 147 | *
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| 148 | * Exchanges are reference counted and exchange gets freed when the reference
|
| 149 | * count becomes zero.
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| 150 | *
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| 151 | * Timeouts:
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| 152 | * Sequences are timed out for E_D_TOV and R_A_TOV.
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| 153 | *
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| 154 | * Sequence event handling:
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| 155 | *
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| 156 | * The following events may occur on initiator sequences:
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| 157 | *
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| 158 | * Send.
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| 159 | * For now, the whole thing is sent.
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| 160 | * Receive ACK
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| 161 | * This applies only to class F.
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| 162 | * The sequence is marked complete.
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| 163 | * ULP completion.
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| 164 | * The upper layer calls fc_exch_done() when done
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| 165 | * with exchange and sequence tuple.
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| 166 | * RX-inferred completion.
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| 167 | * When we receive the next sequence on the same exchange, we can
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| 168 | * retire the previous sequence ID. (XXX not implemented).
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| 169 | * Timeout.
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| 170 | * R_A_TOV frees the sequence ID. If we're waiting for ACK,
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| 171 | * E_D_TOV causes abort and calls upper layer response handler
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| 172 | * with FC_EX_TIMEOUT error.
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| 173 | * Receive RJT
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| 174 | * XXX defer.
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| 175 | * Send ABTS
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| 176 | * On timeout.
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| 177 | *
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| 178 | * The following events may occur on recipient sequences:
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| 179 | *
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| 180 | * Receive
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| 181 | * Allocate sequence for first frame received.
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| 182 | * Hold during receive handler.
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| 183 | * Release when final frame received.
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| 184 | * Keep status of last N of these for the ELS RES command. XXX TBD.
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| 185 | * Receive ABTS
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| 186 | * Deallocate sequence
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| 187 | * Send RJT
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| 188 | * Deallocate
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| 189 | *
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| 190 | * For now, we neglect conditions where only part of a sequence was
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| 191 | * received or transmitted, or where out-of-order receipt is detected.
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| 192 |
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| 193 |
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| 194 | |
| 195 | * Locking notes:
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| 196 | *
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| 197 | * The EM code run in a per-CPU worker thread.
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| 198 | *
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| 199 | * To protect against concurrency between a worker thread code and timers,
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| 200 | * sequence allocation and deallocation must be locked.
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| 201 | * - exchange refcnt can be done atomicly without locks.
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| 202 | * - sequence allocation must be locked by exch lock.
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| 203 | * - If the EM pool lock and ex_lock must be taken at the same time, then the
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| 204 | * EM pool lock must be taken before the ex_lock.
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| 205 |
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| 206 |
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| 207 | |
| 208 | * opcode names for debugging.
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| 209 |
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| 210 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT;
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| 211 |
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| 212 | |
| 213 | * fc_exch_name_lookup() - Lookup name by opcode
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| 214 | * @op: Opcode to be looked up
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| 215 | * @table: Opcode/name table
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| 216 | * @max_index: Index not to be exceeded
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| 217 | *
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| 218 | * This routine is used to determine a human-readable string identifying
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| 219 | * a R_CTL opcode.
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| 220 |
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| 221 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table,
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| 222 | unsigned int max_index)
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| 223 | {
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| 224 | const char *name = NULL;
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| 225 |
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| 226 | if (op < max_index)
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| 227 | name = table[op];
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| 228 | if (!name)
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| 229 | name = "unknown";
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| 230 | return name;
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| 231 | }
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| 232 |
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| 233 | |
| 234 | * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup()
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| 235 | * @op: The opcode to be looked up
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| 236 |
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| 237 | static const char *fc_exch_rctl_name(unsigned int op)
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| 238 | {
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| 239 | return fc_exch_name_lookup(op, fc_exch_rctl_names,
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| 240 | ARRAY_SIZE(fc_exch_rctl_names));
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| 241 | }
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| 242 |
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| 243 | |
| 244 | * fc_exch_hold() - Increment an exchange's reference count
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| 245 | * @ep: Echange to be held
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| 246 |
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| 247 | static inline void fc_exch_hold(struct fc_exch *ep)
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| 248 | {
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| 249 | atomic_inc(&ep->ex_refcnt);
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| 250 | }
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| 251 |
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| 252 | |
| 253 | * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields
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| 254 | * and determine SOF and EOF.
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| 255 | * @ep: The exchange to that will use the header
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| 256 | * @fp: The frame whose header is to be modified
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| 257 | * @f_ctl: F_CTL bits that will be used for the frame header
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| 258 | *
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| 259 | * The fields initialized by this routine are: fh_ox_id, fh_rx_id,
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| 260 | * fh_seq_id, fh_seq_cnt and the SOF and EOF.
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| 261 |
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| 262 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp,
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| 263 | u32 f_ctl)
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| 264 | {
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| 265 | struct fc_frame_header *fh = fc_frame_header_get(fp);
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| 266 | u16 fill;
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| 267 |
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| 268 | fr_sof(fp) = ep->class;
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| 269 | if (ep->seq.cnt)
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| 270 | fr_sof(fp) = fc_sof_normal(ep->class);
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| 271 |
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| 272 | if (f_ctl & FC_FC_END_SEQ) {
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| 273 | fr_eof(fp) = FC_EOF_T;
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| 274 | if (fc_sof_needs_ack((enum fc_sof)ep->class))
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| 275 | fr_eof(fp) = FC_EOF_N;
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| 276 | |
| 277 | * From F_CTL.
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| 278 | * The number of fill bytes to make the length a 4-byte
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| 279 | * multiple is the low order 2-bits of the f_ctl.
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| 280 | * The fill itself will have been cleared by the frame
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| 281 | * allocation.
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| 282 | * After this, the length will be even, as expected by
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| 283 | * the transport.
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| 284 |
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| 285 | fill = fr_len(fp) & 3;
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| 286 | if (fill) {
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| 287 | fill = 4 - fill;
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| 288 |
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| 289 | skb_put(fp_skb(fp), fill);
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| 290 | hton24(fh->fh_f_ctl, f_ctl | fill);
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| 291 | }
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| 292 | } else {
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| 293 | WARN_ON(fr_len(fp) % 4 != 0);
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| 294 | fr_eof(fp) = FC_EOF_N;
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| 295 | }
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| 296 |
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| 297 |
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| 298 | fh->fh_ox_id = htons(ep->oxid);
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| 299 | fh->fh_rx_id = htons(ep->rxid);
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| 300 | fh->fh_seq_id = ep->seq.id;
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| 301 | fh->fh_seq_cnt = htons(ep->seq.cnt);
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| 302 | }
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| 303 |
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| 304 | |
| 305 | * fc_exch_release() - Decrement an exchange's reference count
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| 306 | * @ep: Exchange to be released
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| 307 | *
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| 308 | * If the reference count reaches zero and the exchange is complete,
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| 309 | * it is freed.
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| 310 |
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| 311 | static void fc_exch_release(struct fc_exch *ep)
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| 312 | {
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| 313 | struct fc_exch_mgr *mp;
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| 314 |
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| 315 | if (atomic_dec_and_test(&ep->ex_refcnt)) {
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| 316 | mp = ep->em;
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| 317 | if (ep->destructor)
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| 318 | ep->destructor(&ep->seq, ep->arg);
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| 319 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE));
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| 320 | mempool_free(ep, mp->ep_pool);
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| 321 | }
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| 322 | }
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| 323 |
|
| 324 | |
| 325 | * fc_exch_timer_cancel() - cancel exch timer
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| 326 | * @ep: The exchange whose timer to be canceled
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| 327 |
|
| 328 | static inline void fc_exch_timer_cancel(struct fc_exch *ep)
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| 329 | {
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| 330 | if (cancel_delayed_work(&ep->timeout_work)) {
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| 331 | FC_EXCH_DBG(ep, "Exchange timer canceled\n");
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| 332 | atomic_dec(&ep->ex_refcnt);
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| 333 | }
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| 334 | }
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| 335 |
|
| 336 | |
| 337 | * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the
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| 338 | * the exchange lock held
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| 339 | * @ep: The exchange whose timer will start
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| 340 | * @timer_msec: The timeout period
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| 341 | *
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| 342 | * Used for upper level protocols to time out the exchange.
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| 343 | * The timer is cancelled when it fires or when the exchange completes.
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| 344 |
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| 345 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep,
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| 346 | unsigned int timer_msec)
|
| 347 | {
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| 348 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
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| 349 | return;
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| 350 |
|
| 351 | FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec);
|
| 352 |
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| 353 | fc_exch_hold(ep);
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| 354 | if (!queue_delayed_work(fc_exch_workqueue, &ep->timeout_work,
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| 355 | msecs_to_jiffies(timer_msec))) {
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| 356 | FC_EXCH_DBG(ep, "Exchange already queued\n");
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| 357 | fc_exch_release(ep);
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| 358 | }
|
| 359 | }
|
| 360 |
|
| 361 | |
| 362 | * fc_exch_timer_set() - Lock the exchange and set the timer
|
| 363 | * @ep: The exchange whose timer will start
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| 364 | * @timer_msec: The timeout period
|
| 365 |
|
| 366 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec)
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| 367 | {
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| 368 | spin_lock_bh(&ep->ex_lock);
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| 369 | fc_exch_timer_set_locked(ep, timer_msec);
|
| 370 | spin_unlock_bh(&ep->ex_lock);
|
| 371 | }
|
| 372 |
|
| 373 | |
| 374 | * fc_exch_done_locked() - Complete an exchange with the exchange lock held
|
| 375 | * @ep: The exchange that is complete
|
| 376 | *
|
| 377 | * Note: May sleep if invoked from outside a response handler.
|
| 378 |
|
| 379 | static int fc_exch_done_locked(struct fc_exch *ep)
|
| 380 | {
|
| 381 | int rc = 1;
|
| 382 |
|
| 383 | |
| 384 | * We must check for completion in case there are two threads
|
| 385 | * tyring to complete this. But the rrq code will reuse the
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| 386 | * ep, and in that case we only clear the resp and set it as
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| 387 | * complete, so it can be reused by the timer to send the rrq.
|
| 388 |
|
| 389 | if (ep->state & FC_EX_DONE)
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| 390 | return rc;
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| 391 | ep->esb_stat |= ESB_ST_COMPLETE;
|
| 392 |
|
| 393 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
|
| 394 | ep->state |= FC_EX_DONE;
|
| 395 | fc_exch_timer_cancel(ep);
|
| 396 | rc = 0;
|
| 397 | }
|
| 398 | return rc;
|
| 399 | }
|
| 400 |
|
| 401 | static struct fc_exch fc_quarantine_exch;
|
| 402 |
|
| 403 | |
| 404 | * fc_exch_ptr_get() - Return an exchange from an exchange pool
|
| 405 | * @pool: Exchange Pool to get an exchange from
|
| 406 | * @index: Index of the exchange within the pool
|
| 407 | *
|
| 408 | * Use the index to get an exchange from within an exchange pool. exches
|
| 409 | * will point to an array of exchange pointers. The index will select
|
| 410 | * the exchange within the array.
|
| 411 |
|
| 412 | static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool,
|
| 413 | u16 index)
|
| 414 | {
|
| 415 | struct fc_exch **exches = (struct fc_exch **)(pool + 1);
|
| 416 | return exches[index];
|
| 417 | }
|
| 418 |
|
| 419 | |
| 420 | * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool
|
| 421 | * @pool: The pool to assign the exchange to
|
| 422 | * @index: The index in the pool where the exchange will be assigned
|
| 423 | * @ep: The exchange to assign to the pool
|
| 424 |
|
| 425 | static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index,
|
| 426 | struct fc_exch *ep)
|
| 427 | {
|
| 428 | ((struct fc_exch **)(pool + 1))[index] = ep;
|
| 429 | }
|
| 430 |
|
| 431 | |
| 432 | * fc_exch_delete() - Delete an exchange
|
| 433 | * @ep: The exchange to be deleted
|
| 434 |
|
| 435 | static void fc_exch_delete(struct fc_exch *ep)
|
| 436 | {
|
| 437 | struct fc_exch_pool *pool;
|
| 438 | u16 index;
|
| 439 |
|
| 440 | pool = ep->pool;
|
| 441 | spin_lock_bh(&pool->lock);
|
| 442 | WARN_ON(pool->total_exches <= 0);
|
| 443 | pool->total_exches--;
|
| 444 |
|
| 445 |
|
| 446 | index = (ep->xid - ep->em->min_xid) >> fc_cpu_order;
|
| 447 | if (!(ep->state & FC_EX_QUARANTINE)) {
|
| 448 | if (pool->left == FC_XID_UNKNOWN)
|
| 449 | pool->left = index;
|
| 450 | else if (pool->right == FC_XID_UNKNOWN)
|
| 451 | pool->right = index;
|
| 452 | else
|
| 453 | pool->next_index = index;
|
| 454 | fc_exch_ptr_set(pool, index, NULL);
|
| 455 | } else {
|
| 456 | fc_exch_ptr_set(pool, index, &fc_quarantine_exch);
|
| 457 | }
|
| 458 | list_del(&ep->ex_list);
|
| 459 | spin_unlock_bh(&pool->lock);
|
| 460 | fc_exch_release(ep);
|
| 461 | }
|
| 462 |
|
| 463 | static int fc_seq_send_locked(struct fc_lport *lport, struct fc_seq *sp,
|
| 464 | struct fc_frame *fp)
|
| 465 | {
|
| 466 | struct fc_exch *ep;
|
| 467 | struct fc_frame_header *fh = fc_frame_header_get(fp);
|
| 468 | int error = -ENXIO;
|
| 469 | u32 f_ctl;
|
| 470 | u8 fh_type = fh->fh_type;
|
| 471 |
|
| 472 | ep = fc_seq_exch(sp);
|
| 473 |
|
| 474 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL)) {
|
| 475 | fc_frame_free(fp);
|
| 476 | goto out;
|
| 477 | }
|
| 478 |
|
| 479 | WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT));
|
| 480 |
|
| 481 | f_ctl = ntoh24(fh->fh_f_ctl);
|
| 482 | fc_exch_setup_hdr(ep, fp, f_ctl);
|
| 483 | fr_encaps(fp) = ep->encaps;
|
| 484 |
|
| 485 | |
| 486 | * update sequence count if this frame is carrying
|
| 487 | * multiple FC frames when sequence offload is enabled
|
| 488 | * by LLD.
|
| 489 |
|
| 490 | if (fr_max_payload(fp))
|
| 491 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)),
|
| 492 | fr_max_payload(fp));
|
| 493 | else
|
| 494 | sp->cnt++;
|
| 495 |
|
| 496 | |
| 497 | * Send the frame.
|
| 498 |
|
| 499 | error = lport->tt.frame_send(lport, fp);
|
| 500 |
|
| 501 | if (fh_type == FC_TYPE_BLS)
|
| 502 | goto out;
|
| 503 |
|
| 504 | |
| 505 | * Update the exchange and sequence flags,
|
| 506 | * assuming all frames for the sequence have been sent.
|
| 507 | * We can only be called to send once for each sequence.
|
| 508 |
|
| 509 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ;
|
| 510 | if (f_ctl & FC_FC_SEQ_INIT)
|
| 511 | ep->esb_stat &= ~ESB_ST_SEQ_INIT;
|
| 512 | out:
|
| 513 | return error;
|
| 514 | }
|
| 515 |
|
| 516 | |
| 517 | * fc_seq_send() - Send a frame using existing sequence/exchange pair
|
| 518 | * @lport: The local port that the exchange will be sent on
|
| 519 | * @sp: The sequence to be sent
|
| 520 | * @fp: The frame to be sent on the exchange
|
| 521 | *
|
| 522 | * Note: The frame will be freed either by a direct call to fc_frame_free(fp)
|
| 523 | * or indirectly by calling libfc_function_template.frame_send().
|
| 524 |
|
| 525 | int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, struct fc_frame *fp)
|
| 526 | {
|
| 527 | struct fc_exch *ep;
|
| 528 | int error;
|
| 529 | ep = fc_seq_exch(sp);
|
| 530 | spin_lock_bh(&ep->ex_lock);
|
| 531 | error = fc_seq_send_locked(lport, sp, fp);
|
| 532 | spin_unlock_bh(&ep->ex_lock);
|
| 533 | return error;
|
| 534 | }
|
| 535 | EXPORT_SYMBOL(fc_seq_send);
|
| 536 |
|
| 537 | |
| 538 | * fc_seq_alloc() - Allocate a sequence for a given exchange
|
| 539 | * @ep: The exchange to allocate a new sequence for
|
| 540 | * @seq_id: The sequence ID to be used
|
| 541 | *
|
| 542 | * We don't support multiple originated sequences on the same exchange.
|
| 543 | * By implication, any previously originated sequence on this exchange
|
| 544 | * is complete, and we reallocate the same sequence.
|
| 545 |
|
| 546 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id)
|
| 547 | {
|
| 548 | struct fc_seq *sp;
|
| 549 |
|
| 550 | sp = &ep->seq;
|
| 551 | sp->ssb_stat = 0;
|
| 552 | sp->cnt = 0;
|
| 553 | sp->id = seq_id;
|
| 554 | return sp;
|
| 555 | }
|
| 556 |
|
| 557 | |
| 558 | * fc_seq_start_next_locked() - Allocate a new sequence on the same
|
| 559 | * exchange as the supplied sequence
|
| 560 | * @sp: The sequence/exchange to get a new sequence for
|
| 561 |
|
| 562 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp)
|
| 563 | {
|
| 564 | struct fc_exch *ep = fc_seq_exch(sp);
|
| 565 |
|
| 566 | sp = fc_seq_alloc(ep, ep->seq_id++);
|
| 567 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n",
|
| 568 | ep->f_ctl, sp->id);
|
| 569 | return sp;
|
| 570 | }
|
| 571 |
|
| 572 | |
| 573 | * fc_seq_start_next() - Lock the exchange and get a new sequence
|
| 574 | * for a given sequence/exchange pair
|
| 575 | * @sp: The sequence/exchange to get a new exchange for
|
| 576 |
|
| 577 | struct fc_seq *fc_seq_start_next(struct fc_seq *sp)
|
| 578 | {
|
| 579 | struct fc_exch *ep = fc_seq_exch(sp);
|
| 580 |
|
| 581 | spin_lock_bh(&ep->ex_lock);
|
| 582 | sp = fc_seq_start_next_locked(sp);
|
| 583 | spin_unlock_bh(&ep->ex_lock);
|
| 584 |
|
| 585 | return sp;
|
| 586 | }
|
| 587 | EXPORT_SYMBOL(fc_seq_start_next);
|
| 588 |
|
| 589 | |
| 590 | * Set the response handler for the exchange associated with a sequence.
|
| 591 | *
|
| 592 | * Note: May sleep if invoked from outside a response handler.
|
| 593 |
|
| 594 | void fc_seq_set_resp(struct fc_seq *sp,
|
| 595 | void (*resp)(struct fc_seq *, struct fc_frame *, void *),
|
| 596 | void *arg)
|
| 597 | {
|
| 598 | struct fc_exch *ep = fc_seq_exch(sp);
|
| 599 | DEFINE_WAIT(wait);
|
| 600 |
|
| 601 | spin_lock_bh(&ep->ex_lock);
|
| 602 | while (ep->resp_active && ep->resp_task != current) {
|
| 603 | prepare_to_wait(&ep->resp_wq, &wait, TASK_UNINTERRUPTIBLE);
|
| 604 | spin_unlock_bh(&ep->ex_lock);
|
| 605 |
|
| 606 | schedule();
|
| 607 |
|
| 608 | spin_lock_bh(&ep->ex_lock);
|
| 609 | }
|
| 610 | finish_wait(&ep->resp_wq, &wait);
|
| 611 | ep->resp = resp;
|
| 612 | ep->arg = arg;
|
| 613 | spin_unlock_bh(&ep->ex_lock);
|
| 614 | }
|
| 615 | EXPORT_SYMBOL(fc_seq_set_resp);
|
| 616 |
|
| 617 | |
| 618 | * fc_exch_abort_locked() - Abort an exchange
|
| 619 | * @ep: The exchange to be aborted
|
| 620 | * @timer_msec: The period of time to wait before aborting
|
| 621 | *
|
| 622 | * Abort an exchange and sequence. Generally called because of a
|
| 623 | * exchange timeout or an abort from the upper layer.
|
| 624 | *
|
| 625 | * A timer_msec can be specified for abort timeout, if non-zero
|
| 626 | * timer_msec value is specified then exchange resp handler
|
| 627 | * will be called with timeout error if no response to abort.
|
| 628 | *
|
| 629 | * Locking notes: Called with exch lock held
|
| 630 | *
|
| 631 | * Return value: 0 on success else error code
|
| 632 |
|
| 633 | static int fc_exch_abort_locked(struct fc_exch *ep,
|
| 634 | unsigned int timer_msec)
|
| 635 | {
|
| 636 | struct fc_seq *sp;
|
| 637 | struct fc_frame *fp;
|
| 638 | int error;
|
| 639 |
|
| 640 | FC_EXCH_DBG(ep, "exch: abort, time %d msecs\n", timer_msec);
|
| 641 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) ||
|
| 642 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) {
|
| 643 | FC_EXCH_DBG(ep, "exch: already completed esb %x state %x\n",
|
| 644 | ep->esb_stat, ep->state);
|
| 645 | return -ENXIO;
|
| 646 | }
|
| 647 |
|
| 648 | |
| 649 | * Send the abort on a new sequence if possible.
|
| 650 |
|
| 651 | sp = fc_seq_start_next_locked(&ep->seq);
|
| 652 | if (!sp)
|
| 653 | return -ENOMEM;
|
| 654 |
|
| 655 | if (timer_msec)
|
| 656 | fc_exch_timer_set_locked(ep, timer_msec);
|
| 657 |
|
| 658 | if (ep->sid) {
|
| 659 | |
| 660 | * Send an abort for the sequence that timed out.
|
| 661 |
|
| 662 | fp = fc_frame_alloc(ep->lp, 0);
|
| 663 | if (fp) {
|
| 664 | ep->esb_stat |= ESB_ST_SEQ_INIT;
|
| 665 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid,
|
| 666 | FC_TYPE_BLS, FC_FC_END_SEQ |
|
| 667 | FC_FC_SEQ_INIT, 0);
|
| 668 | error = fc_seq_send_locked(ep->lp, sp, fp);
|
| 669 | } else {
|
| 670 | error = -ENOBUFS;
|
| 671 | }
|
| 672 | } else {
|
| 673 | |
| 674 | * If not logged into the fabric, don't send ABTS but leave
|
| 675 | * sequence active until next timeout.
|
| 676 |
|
| 677 | error = 0;
|
| 678 | }
|
| 679 | ep->esb_stat |= ESB_ST_ABNORMAL;
|
| 680 | return error;
|
| 681 | }
|
| 682 |
|
| 683 | |
| 684 | * fc_seq_exch_abort() - Abort an exchange and sequence
|
| 685 | * @req_sp: The sequence to be aborted
|
| 686 | * @timer_msec: The period of time to wait before aborting
|
| 687 | *
|
| 688 | * Generally called because of a timeout or an abort from the upper layer.
|
| 689 | *
|
| 690 | * Return value: 0 on success else error code
|
| 691 |
|
| 692 | int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec)
|
| 693 | {
|
| 694 | struct fc_exch *ep;
|
| 695 | int error;
|
| 696 |
|
| 697 | ep = fc_seq_exch(req_sp);
|
| 698 | spin_lock_bh(&ep->ex_lock);
|
| 699 | error = fc_exch_abort_locked(ep, timer_msec);
|
| 700 | spin_unlock_bh(&ep->ex_lock);
|
| 701 | return error;
|
| 702 | }
|
| 703 |
|
| 704 | |
| 705 | * fc_invoke_resp() - invoke ep->resp()
|
| 706 | * @ep: The exchange to be operated on
|
| 707 | * @fp: The frame pointer to pass through to ->resp()
|
| 708 | * @sp: The sequence pointer to pass through to ->resp()
|
| 709 | *
|
| 710 | * Notes:
|
| 711 | * It is assumed that after initialization finished (this means the
|
| 712 | * first unlock of ex_lock after fc_exch_alloc()) ep->resp and ep->arg are
|
| 713 | * modified only via fc_seq_set_resp(). This guarantees that none of these
|
| 714 | * two variables changes if ep->resp_active > 0.
|
| 715 | *
|
| 716 | * If an fc_seq_set_resp() call is busy modifying ep->resp and ep->arg when
|
| 717 | * this function is invoked, the first spin_lock_bh() call in this function
|
| 718 | * will wait until fc_seq_set_resp() has finished modifying these variables.
|
| 719 | *
|
| 720 | * Since fc_exch_done() invokes fc_seq_set_resp() it is guaranteed that that
|
| 721 | * ep->resp() won't be invoked after fc_exch_done() has returned.
|
| 722 | *
|
| 723 | * The response handler itself may invoke fc_exch_done(), which will clear the
|
| 724 | * ep->resp pointer.
|
| 725 | *
|
| 726 | * Return value:
|
| 727 | * Returns true if and only if ep->resp has been invoked.
|
| 728 |
|
| 729 | static bool fc_invoke_resp(struct fc_exch *ep, struct fc_seq *sp,
|
| 730 | struct fc_frame *fp)
|
| 731 | {
|
| 732 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
|
| 733 | void *arg;
|
| 734 | bool res = false;
|
| 735 |
|
| 736 | spin_lock_bh(&ep->ex_lock);
|
| 737 | ep->resp_active++;
|
| 738 | if (ep->resp_task != current)
|
| 739 | ep->resp_task = !ep->resp_task ? current : NULL;
|
| 740 | resp = ep->resp;
|
| 741 | arg = ep->arg;
|
| 742 | spin_unlock_bh(&ep->ex_lock);
|
| 743 |
|
| 744 | if (resp) {
|
| 745 | resp(sp, fp, arg);
|
| 746 | res = true;
|
| 747 | }
|
| 748 |
|
| 749 | spin_lock_bh(&ep->ex_lock);
|
| 750 | if (--ep->resp_active == 0)
|
| 751 | ep->resp_task = NULL;
|
| 752 | spin_unlock_bh(&ep->ex_lock);
|
| 753 |
|
| 754 | if (ep->resp_active == 0)
|
| 755 | wake_up(&ep->resp_wq);
|
| 756 |
|
| 757 | return res;
|
| 758 | }
|
| 759 |
|
| 760 | |
| 761 | * fc_exch_timeout() - Handle exchange timer expiration
|
| 762 | * @work: The work_struct identifying the exchange that timed out
|
| 763 |
|
| 764 | static void fc_exch_timeout(struct work_struct *work)
|
| 765 | {
|
| 766 | struct fc_exch *ep = container_of(work, struct fc_exch,
|
| 767 | timeout_work.work);
|
| 768 | struct fc_seq *sp = &ep->seq;
|
| 769 | u32 e_stat;
|
| 770 | int rc = 1;
|
| 771 |
|
| 772 | FC_EXCH_DBG(ep, "Exchange timed out state %x\n", ep->state);
|
| 773 |
|
| 774 | spin_lock_bh(&ep->ex_lock);
|
| 775 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
|
| 776 | goto unlock;
|
| 777 |
|
| 778 | e_stat = ep->esb_stat;
|
| 779 | if (e_stat & ESB_ST_COMPLETE) {
|
| 780 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL;
|
| 781 | spin_unlock_bh(&ep->ex_lock);
|
| 782 | if (e_stat & ESB_ST_REC_QUAL)
|
| 783 | fc_exch_rrq(ep);
|
| 784 | goto done;
|
| 785 | } else {
|
| 786 | if (e_stat & ESB_ST_ABNORMAL)
|
| 787 | rc = fc_exch_done_locked(ep);
|
| 788 | spin_unlock_bh(&ep->ex_lock);
|
| 789 | if (!rc)
|
| 790 | fc_exch_delete(ep);
|
| 791 | fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_TIMEOUT));
|
| 792 | fc_seq_set_resp(sp, NULL, ep->arg);
|
| 793 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov);
|
| 794 | goto done;
|
| 795 | }
|
| 796 | unlock:
|
| 797 | spin_unlock_bh(&ep->ex_lock);
|
| 798 | done:
|
| 799 | |
| 800 | * This release matches the hold taken when the timer was set.
|
| 801 |
|
| 802 | fc_exch_release(ep);
|
| 803 | }
|
| 804 |
|
| 805 | |
| 806 | * fc_exch_em_alloc() - Allocate an exchange from a specified EM.
|
| 807 | * @lport: The local port that the exchange is for
|
| 808 | * @mp: The exchange manager that will allocate the exchange
|
| 809 | *
|
| 810 | * Returns pointer to allocated fc_exch with exch lock held.
|
| 811 |
|
| 812 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport,
|
| 813 | struct fc_exch_mgr *mp)
|
| 814 | {
|
| 815 | struct fc_exch *ep;
|
| 816 | unsigned int cpu;
|
| 817 | u16 index;
|
| 818 | struct fc_exch_pool *pool;
|
| 819 |
|
| 820 |
|
| 821 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC);
|
| 822 | if (!ep) {
|
| 823 | atomic_inc(&mp->stats.no_free_exch);
|
| 824 | goto out;
|
| 825 | }
|
| 826 | memset(ep, 0, sizeof(*ep));
|
| 827 |
|
| 828 | cpu = raw_smp_processor_id();
|
| 829 | pool = per_cpu_ptr(mp->pool, cpu);
|
| 830 | spin_lock_bh(&pool->lock);
|
| 831 |
|
| 832 |
|
| 833 | if (pool->left != FC_XID_UNKNOWN) {
|
| 834 | if (!WARN_ON(fc_exch_ptr_get(pool, pool->left))) {
|
| 835 | index = pool->left;
|
| 836 | pool->left = FC_XID_UNKNOWN;
|
| 837 | goto hit;
|
| 838 | }
|
| 839 | }
|
| 840 | if (pool->right != FC_XID_UNKNOWN) {
|
| 841 | if (!WARN_ON(fc_exch_ptr_get(pool, pool->right))) {
|
| 842 | index = pool->right;
|
| 843 | pool->right = FC_XID_UNKNOWN;
|
| 844 | goto hit;
|
| 845 | }
|
| 846 | }
|
| 847 |
|
| 848 | index = pool->next_index;
|
| 849 |
|
| 850 | while (fc_exch_ptr_get(pool, index)) {
|
| 851 | index = index == mp->pool_max_index ? 0 : index + 1;
|
| 852 | if (index == pool->next_index)
|
| 853 | goto err;
|
| 854 | }
|
| 855 | pool->next_index = index == mp->pool_max_index ? 0 : index + 1;
|
| 856 | hit:
|
| 857 | fc_exch_hold(ep);
|
| 858 | spin_lock_init(&ep->ex_lock);
|
| 859 | |
| 860 | * Hold exch lock for caller to prevent fc_exch_reset()
|
| 861 | * from releasing exch while fc_exch_alloc() caller is
|
| 862 | * still working on exch.
|
| 863 |
|
| 864 | spin_lock_bh(&ep->ex_lock);
|
| 865 |
|
| 866 | fc_exch_ptr_set(pool, index, ep);
|
| 867 | list_add_tail(&ep->ex_list, &pool->ex_list);
|
| 868 | fc_seq_alloc(ep, ep->seq_id++);
|
| 869 | pool->total_exches++;
|
| 870 | spin_unlock_bh(&pool->lock);
|
| 871 |
|
| 872 | |
| 873 | * update exchange
|
| 874 |
|
| 875 | ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid;
|
| 876 | ep->em = mp;
|
| 877 | ep->pool = pool;
|
| 878 | ep->lp = lport;
|
| 879 | ep->f_ctl = FC_FC_FIRST_SEQ;
|
| 880 | ep->rxid = FC_XID_UNKNOWN;
|
| 881 | ep->class = mp->class;
|
| 882 | ep->resp_active = 0;
|
| 883 | init_waitqueue_head(&ep->resp_wq);
|
| 884 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout);
|
| 885 | out:
|
| 886 | return ep;
|
| 887 | err:
|
| 888 | spin_unlock_bh(&pool->lock);
|
| 889 | atomic_inc(&mp->stats.no_free_exch_xid);
|
| 890 | mempool_free(ep, mp->ep_pool);
|
| 891 | return NULL;
|
| 892 | }
|
| 893 |
|
| 894 | |
| 895 | * fc_exch_alloc() - Allocate an exchange from an EM on a
|
| 896 | * local port's list of EMs.
|
| 897 | * @lport: The local port that will own the exchange
|
| 898 | * @fp: The FC frame that the exchange will be for
|
| 899 | *
|
| 900 | * This function walks the list of exchange manager(EM)
|
| 901 | * anchors to select an EM for a new exchange allocation. The
|
| 902 | * EM is selected when a NULL match function pointer is encountered
|
| 903 | * or when a call to a match function returns true.
|
| 904 |
|
| 905 | static struct fc_exch *fc_exch_alloc(struct fc_lport *lport,
|
| 906 | struct fc_frame *fp)
|
| 907 | {
|
| 908 | struct fc_exch_mgr_anchor *ema;
|
| 909 | struct fc_exch *ep;
|
| 910 |
|
| 911 | list_for_each_entry(ema, &lport->ema_list, ema_list) {
|
| 912 | if (!ema->match || ema->match(fp)) {
|
| 913 | ep = fc_exch_em_alloc(lport, ema->mp);
|
| 914 | if (ep)
|
| 915 | return ep;
|
| 916 | }
|
| 917 | }
|
| 918 | return NULL;
|
| 919 | }
|
| 920 |
|
| 921 | |
| 922 | * fc_exch_find() - Lookup and hold an exchange
|
| 923 | * @mp: The exchange manager to lookup the exchange from
|
| 924 | * @xid: The XID of the exchange to look up
|
| 925 |
|
| 926 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid)
|
| 927 | {
|
| 928 | struct fc_lport *lport = mp->lport;
|
| 929 | struct fc_exch_pool *pool;
|
| 930 | struct fc_exch *ep = NULL;
|
| 931 | u16 cpu = xid & fc_cpu_mask;
|
| 932 |
|
| 933 | if (xid == FC_XID_UNKNOWN)
|
| 934 | return NULL;
|
| 935 |
|
| 936 | if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
|
| 937 | pr_err("host%u: lport %6.6x: xid %d invalid CPU %d\n:",
|
| 938 | lport->host->host_no, lport->port_id, xid, cpu);
|
| 939 | return NULL;
|
| 940 | }
|
| 941 |
|
| 942 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) {
|
| 943 | pool = per_cpu_ptr(mp->pool, cpu);
|
| 944 | spin_lock_bh(&pool->lock);
|
| 945 | ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order);
|
| 946 | if (ep == &fc_quarantine_exch) {
|
| 947 | FC_LPORT_DBG(lport, "xid %x quarantined\n", xid);
|
| 948 | ep = NULL;
|
| 949 | }
|
| 950 | if (ep) {
|
| 951 | WARN_ON(ep->xid != xid);
|
| 952 | fc_exch_hold(ep);
|
| 953 | }
|
| 954 | spin_unlock_bh(&pool->lock);
|
| 955 | }
|
| 956 | return ep;
|
| 957 | }
|
| 958 |
|
| 959 |
|
| 960 | |
| 961 | * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and
|
| 962 | * the memory allocated for the related objects may be freed.
|
| 963 | * @sp: The sequence that has completed
|
| 964 | *
|
| 965 | * Note: May sleep if invoked from outside a response handler.
|
| 966 |
|
| 967 | void fc_exch_done(struct fc_seq *sp)
|
| 968 | {
|
| 969 | struct fc_exch *ep = fc_seq_exch(sp);
|
| 970 | int rc;
|
| 971 |
|
| 972 | spin_lock_bh(&ep->ex_lock);
|
| 973 | rc = fc_exch_done_locked(ep);
|
| 974 | spin_unlock_bh(&ep->ex_lock);
|
| 975 |
|
| 976 | fc_seq_set_resp(sp, NULL, ep->arg);
|
| 977 | if (!rc)
|
| 978 | fc_exch_delete(ep);
|
| 979 | }
|
| 980 | EXPORT_SYMBOL(fc_exch_done);
|
| 981 |
|
| 982 | |
| 983 | * fc_exch_resp() - Allocate a new exchange for a response frame
|
| 984 | * @lport: The local port that the exchange was for
|
| 985 | * @mp: The exchange manager to allocate the exchange from
|
| 986 | * @fp: The response frame
|
| 987 | *
|
| 988 | * Sets the responder ID in the frame header.
|
| 989 |
|
| 990 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport,
|
| 991 | struct fc_exch_mgr *mp,
|
| 992 | struct fc_frame *fp)
|
| 993 | {
|
| 994 | struct fc_exch *ep;
|
| 995 | struct fc_frame_header *fh;
|
| 996 |
|
| 997 | ep = fc_exch_alloc(lport, fp);
|
| 998 | if (ep) {
|
| 999 | ep->class = fc_frame_class(fp);
|
| 1000 |
|
| 1001 | |
| 1002 | * Set EX_CTX indicating we're responding on this exchange.
|
| 1003 |
|
| 1004 | ep->f_ctl |= FC_FC_EX_CTX;
|
| 1005 | ep->f_ctl &= ~FC_FC_FIRST_SEQ;
|
| 1006 | fh = fc_frame_header_get(fp);
|
| 1007 | ep->sid = ntoh24(fh->fh_d_id);
|
| 1008 | ep->did = ntoh24(fh->fh_s_id);
|
| 1009 | ep->oid = ep->did;
|
| 1010 |
|
| 1011 | |
| 1012 | * Allocated exchange has placed the XID in the
|
| 1013 | * originator field. Move it to the responder field,
|
| 1014 | * and set the originator XID from the frame.
|
| 1015 |
|
| 1016 | ep->rxid = ep->xid;
|
| 1017 | ep->oxid = ntohs(fh->fh_ox_id);
|
| 1018 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT;
|
| 1019 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0)
|
| 1020 | ep->esb_stat &= ~ESB_ST_SEQ_INIT;
|
| 1021 |
|
| 1022 | fc_exch_hold(ep);
|
| 1023 | spin_unlock_bh(&ep->ex_lock);
|
| 1024 | }
|
| 1025 | return ep;
|
| 1026 | }
|
| 1027 |
|
| 1028 | |
| 1029 | * fc_seq_lookup_recip() - Find a sequence where the other end
|
| 1030 | * originated the sequence
|
| 1031 | * @lport: The local port that the frame was sent to
|
| 1032 | * @mp: The Exchange Manager to lookup the exchange from
|
| 1033 | * @fp: The frame associated with the sequence we're looking for
|
| 1034 | *
|
| 1035 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
|
| 1036 | * on the ep that should be released by the caller.
|
| 1037 |
|
| 1038 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport,
|
| 1039 | struct fc_exch_mgr *mp,
|
| 1040 | struct fc_frame *fp)
|
| 1041 | {
|
| 1042 | struct fc_frame_header *fh = fc_frame_header_get(fp);
|
| 1043 | struct fc_exch *ep = NULL;
|
| 1044 | struct fc_seq *sp = NULL;
|
| 1045 | enum fc_pf_rjt_reason reject = FC_RJT_NONE;
|
| 1046 | u32 f_ctl;
|
| 1047 | u16 xid;
|
| 1048 |
|
| 1049 | f_ctl = ntoh24(fh->fh_f_ctl);
|
| 1050 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0);
|
| 1051 |
|
| 1052 | |
| 1053 | * Lookup or create the exchange if we will be creating the sequence.
|
| 1054 |
|
| 1055 | if (f_ctl & FC_FC_EX_CTX) {
|
| 1056 | xid = ntohs(fh->fh_ox_id);
|
| 1057 | ep = fc_exch_find(mp, xid);
|
| 1058 | if (!ep) {
|
| 1059 | atomic_inc(&mp->stats.xid_not_found);
|
| 1060 | reject = FC_RJT_OX_ID;
|
| 1061 | goto out;
|
| 1062 | }
|
| 1063 | if (ep->rxid == FC_XID_UNKNOWN)
|
| 1064 | ep->rxid = ntohs(fh->fh_rx_id);
|
| 1065 | else if (ep->rxid != ntohs(fh->fh_rx_id)) {
|
| 1066 | reject = FC_RJT_OX_ID;
|
| 1067 | goto rel;
|
| 1068 | }
|
| 1069 | } else {
|
| 1070 | xid = ntohs(fh->fh_rx_id);
|
| 1071 |
|
| 1072 | |
| 1073 | * Special case for MDS issuing an ELS TEST with a
|
| 1074 | * bad rxid of 0.
|
| 1075 | * XXX take this out once we do the proper reject.
|
| 1076 |
|
| 1077 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ &&
|
| 1078 | fc_frame_payload_op(fp) == ELS_TEST) {
|
| 1079 | fh->fh_rx_id = htons(FC_XID_UNKNOWN);
|
| 1080 | xid = FC_XID_UNKNOWN;
|
| 1081 | }
|
| 1082 |
|
| 1083 | |
| 1084 | * new sequence - find the exchange
|
| 1085 |
|
| 1086 | ep = fc_exch_find(mp, xid);
|
| 1087 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) {
|
| 1088 | if (ep) {
|
| 1089 | atomic_inc(&mp->stats.xid_busy);
|
| 1090 | reject = FC_RJT_RX_ID;
|
| 1091 | goto rel;
|
| 1092 | }
|
| 1093 | ep = fc_exch_resp(lport, mp, fp);
|
| 1094 | if (!ep) {
|
| 1095 | reject = FC_RJT_EXCH_EST;
|
| 1096 | goto out;
|
| 1097 | }
|
| 1098 | xid = ep->xid;
|
| 1099 | } else if (!ep) {
|
| 1100 | atomic_inc(&mp->stats.xid_not_found);
|
| 1101 | reject = FC_RJT_RX_ID;
|
| 1102 | goto out;
|
| 1103 | }
|
| 1104 | }
|
| 1105 |
|
| 1106 | spin_lock_bh(&ep->ex_lock);
|
| 1107 | |
| 1108 | * At this point, we have the exchange held.
|
| 1109 | * Find or create the sequence.
|
| 1110 |
|
| 1111 | if (fc_sof_is_init(fr_sof(fp))) {
|
| 1112 | sp = &ep->seq;
|
| 1113 | sp->ssb_stat |= SSB_ST_RESP;
|
| 1114 | sp->id = fh->fh_seq_id;
|
| 1115 | } else {
|
| 1116 | sp = &ep->seq;
|
| 1117 | if (sp->id != fh->fh_seq_id) {
|
| 1118 | atomic_inc(&mp->stats.seq_not_found);
|
| 1119 | if (f_ctl & FC_FC_END_SEQ) {
|
| 1120 | |
| 1121 | * Update sequence_id based on incoming last
|
| 1122 | * frame of sequence exchange. This is needed
|
| 1123 | * for FC target where DDP has been used
|
| 1124 | * on target where, stack is indicated only
|
| 1125 | * about last frame's (payload _header) header.
|
| 1126 | * Whereas "seq_id" which is part of
|
| 1127 | * frame_header is allocated by initiator
|
| 1128 | * which is totally different from "seq_id"
|
| 1129 | * allocated when XFER_RDY was sent by target.
|
| 1130 | * To avoid false -ve which results into not
|
| 1131 | * sending RSP, hence write request on other
|
| 1132 | * end never finishes.
|
| 1133 |
|
| 1134 | sp->ssb_stat |= SSB_ST_RESP;
|
| 1135 | sp->id = fh->fh_seq_id;
|
| 1136 | } else {
|
| 1137 | spin_unlock_bh(&ep->ex_lock);
|
| 1138 |
|
| 1139 |
|
| 1140 | reject = FC_RJT_SEQ_ID;
|
| 1141 | goto rel;
|
| 1142 | }
|
| 1143 | }
|
| 1144 | }
|
| 1145 | WARN_ON(ep != fc_seq_exch(sp));
|
| 1146 |
|
| 1147 | if (f_ctl & FC_FC_SEQ_INIT)
|
| 1148 | ep->esb_stat |= ESB_ST_SEQ_INIT;
|
| 1149 | spin_unlock_bh(&ep->ex_lock);
|
| 1150 |
|
| 1151 | fr_seq(fp) = sp;
|
| 1152 | out:
|
| 1153 | return reject;
|
| 1154 | rel:
|
| 1155 | fc_exch_done(&ep->seq);
|
| 1156 | fc_exch_release(ep);
|
| 1157 | return reject;
|
| 1158 | }
|
| 1159 |
|
| 1160 | |
| 1161 | * fc_seq_lookup_orig() - Find a sequence where this end
|
| 1162 | * originated the sequence
|
| 1163 | * @mp: The Exchange Manager to lookup the exchange from
|
| 1164 | * @fp: The frame associated with the sequence we're looking for
|
| 1165 | *
|
| 1166 | * Does not hold the sequence for the caller.
|
| 1167 |
|
| 1168 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp,
|
| 1169 | struct fc_frame *fp)
|
| 1170 | {
|
| 1171 | struct fc_frame_header *fh = fc_frame_header_get(fp);
|
| 1172 | struct fc_exch *ep;
|
| 1173 | struct fc_seq *sp = NULL;
|
| 1174 | u32 f_ctl;
|
| 1175 | u16 xid;
|
| 1176 |
|
| 1177 | f_ctl = ntoh24(fh->fh_f_ctl);
|
| 1178 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX);
|
| 1179 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id);
|
| 1180 | ep = fc_exch_find(mp, xid);
|
| 1181 | if (!ep)
|
| 1182 | return NULL;
|
| 1183 | if (ep->seq.id == fh->fh_seq_id) {
|
| 1184 | |
| 1185 | * Save the RX_ID if we didn't previously know it.
|
| 1186 |
|
| 1187 | sp = &ep->seq;
|
| 1188 | if ((f_ctl & FC_FC_EX_CTX) != 0 &&
|
| 1189 | ep->rxid == FC_XID_UNKNOWN) {
|
| 1190 | ep->rxid = ntohs(fh->fh_rx_id);
|
| 1191 | }
|
| 1192 | }
|
| 1193 | fc_exch_release(ep);
|
| 1194 | return sp;
|
| 1195 | }
|
| 1196 |
|
| 1197 | |
| 1198 | * fc_exch_set_addr() - Set the source and destination IDs for an exchange
|
| 1199 | * @ep: The exchange to set the addresses for
|
| 1200 | * @orig_id: The originator's ID
|
| 1201 | * @resp_id: The responder's ID
|
| 1202 | *
|
| 1203 | * Note this must be done before the first sequence of the exchange is sent.
|
| 1204 |
|
| 1205 | static void fc_exch_set_addr(struct fc_exch *ep,
|
| 1206 | u32 orig_id, u32 resp_id)
|
| 1207 | {
|
| 1208 | ep->oid = orig_id;
|
| 1209 | if (ep->esb_stat & ESB_ST_RESP) {
|
| 1210 | ep->sid = resp_id;
|
| 1211 | ep->did = orig_id;
|
| 1212 | } else {
|
| 1213 | ep->sid = orig_id;
|
| 1214 | ep->did = resp_id;
|
| 1215 | }
|
| 1216 | }
|
| 1217 |
|
| 1218 | |
| 1219 | * fc_seq_els_rsp_send() - Send an ELS response using information from
|
| 1220 | * the existing sequence/exchange.
|
| 1221 | * @fp: The received frame
|
| 1222 | * @els_cmd: The ELS command to be sent
|
| 1223 | * @els_data: The ELS data to be sent
|
| 1224 | *
|
| 1225 | * The received frame is not freed.
|
| 1226 |
|
| 1227 | void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd,
|
| 1228 | struct fc_seq_els_data *els_data)
|
| 1229 | {
|
| 1230 | switch (els_cmd) {
|
| 1231 | case ELS_LS_RJT:
|
| 1232 | fc_seq_ls_rjt(fp, els_data->reason, els_data->explan);
|
| 1233 | break;
|
| 1234 | case ELS_LS_ACC:
|
| 1235 | fc_seq_ls_acc(fp);
|
| 1236 | break;
|
| 1237 | case ELS_RRQ:
|
| 1238 | fc_exch_els_rrq(fp);
|
| 1239 | break;
|
| 1240 | case ELS_REC:
|
| 1241 | fc_exch_els_rec(fp);
|
| 1242 | break;
|
| 1243 | default:
|
| 1244 | FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd);
|
| 1245 | }
|
| 1246 | }
|
| 1247 | EXPORT_SYMBOL_GPL(fc_seq_els_rsp_send);
|
| 1248 |
|
| 1249 | |
| 1250 | * fc_seq_send_last() - Send a sequence that is the last in the exchange
|
| 1251 | * @sp: The sequence that is to be sent
|
| 1252 | * @fp: The frame that will be sent on the sequence
|
| 1253 | * @rctl: The R_CTL information to be sent
|
| 1254 | * @fh_type: The frame header type
|
| 1255 |
|
| 1256 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp,
|
| 1257 | enum fc_rctl rctl, enum fc_fh_type fh_type)
|
| 1258 | {
|
| 1259 | u32 f_ctl;
|
| 1260 | struct fc_exch *ep = fc_seq_exch(sp);
|
| 1261 |
|
| 1262 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
|
| 1263 | f_ctl |= ep->f_ctl;
|
| 1264 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0);
|
| 1265 | fc_seq_send_locked(ep->lp, sp, fp);
|
| 1266 | }
|
| 1267 |
|
| 1268 | |
| 1269 | * fc_seq_send_ack() - Send an acknowledgement that we've received a frame
|
| 1270 | * @sp: The sequence to send the ACK on
|
| 1271 | * @rx_fp: The received frame that is being acknoledged
|
| 1272 | *
|
| 1273 | * Send ACK_1 (or equiv.) indicating we received something.
|
| 1274 |
|
| 1275 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp)
|
| 1276 | {
|
| 1277 | struct fc_frame *fp;
|
| 1278 | struct fc_frame_header *rx_fh;
|
| 1279 | struct fc_frame_header *fh;
|
| 1280 | struct fc_exch *ep = fc_seq_exch(sp);
|
| 1281 | struct fc_lport *lport = ep->lp;
|
| 1282 | unsigned int f_ctl;
|
| 1283 |
|
| 1284 | |
| 1285 | * Don't send ACKs for class 3.
|
| 1286 |
|
| 1287 | if (fc_sof_needs_ack(fr_sof(rx_fp))) {
|
| 1288 | fp = fc_frame_alloc(lport, 0);
|
| 1289 | if (!fp) {
|
| 1290 | FC_EXCH_DBG(ep, "Drop ACK request, out of memory\n");
|
| 1291 | return;
|
| 1292 | }
|
| 1293 |
|
| 1294 | fh = fc_frame_header_get(fp);
|
| 1295 | fh->fh_r_ctl = FC_RCTL_ACK_1;
|
| 1296 | fh->fh_type = FC_TYPE_BLS;
|
| 1297 |
|
| 1298 | |
| 1299 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
|
| 1300 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
|
| 1301 | * Bits 9-8 are meaningful (retransmitted or unidirectional).
|
| 1302 | * Last ACK uses bits 7-6 (continue sequence),
|
| 1303 | * bits 5-4 are meaningful (what kind of ACK to use).
|
| 1304 |
|
| 1305 | rx_fh = fc_frame_header_get(rx_fp);
|
| 1306 | f_ctl = ntoh24(rx_fh->fh_f_ctl);
|
| 1307 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
|
| 1308 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ |
|
| 1309 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT |
|
| 1310 | FC_FC_RETX_SEQ | FC_FC_UNI_TX;
|
| 1311 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
|
| 1312 | hton24(fh->fh_f_ctl, f_ctl);
|
| 1313 |
|
| 1314 | fc_exch_setup_hdr(ep, fp, f_ctl);
|
| 1315 | fh->fh_seq_id = rx_fh->fh_seq_id;
|
| 1316 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
|
| 1317 | fh->fh_parm_offset = htonl(1);
|
| 1318 |
|
| 1319 | fr_sof(fp) = fr_sof(rx_fp);
|
| 1320 | if (f_ctl & FC_FC_END_SEQ)
|
| 1321 | fr_eof(fp) = FC_EOF_T;
|
| 1322 | else
|
| 1323 | fr_eof(fp) = FC_EOF_N;
|
| 1324 |
|
| 1325 | lport->tt.frame_send(lport, fp);
|
| 1326 | }
|
| 1327 | }
|
| 1328 |
|
| 1329 | |
| 1330 | * fc_exch_send_ba_rjt() - Send BLS Reject
|
| 1331 | * @rx_fp: The frame being rejected
|
| 1332 | * @reason: The reason the frame is being rejected
|
| 1333 | * @explan: The explanation for the rejection
|
| 1334 | *
|
| 1335 | * This is for rejecting BA_ABTS only.
|
| 1336 |
|
| 1337 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp,
|
| 1338 | enum fc_ba_rjt_reason reason,
|
| 1339 | enum fc_ba_rjt_explan explan)
|
| 1340 | {
|
| 1341 | struct fc_frame *fp;
|
| 1342 | struct fc_frame_header *rx_fh;
|
| 1343 | struct fc_frame_header *fh;
|
| 1344 | struct fc_ba_rjt *rp;
|
| 1345 | struct fc_seq *sp;
|
| 1346 | struct fc_lport *lport;
|
| 1347 | unsigned int f_ctl;
|
| 1348 |
|
| 1349 | lport = fr_dev(rx_fp);
|
| 1350 | sp = fr_seq(rx_fp);
|
| 1351 | fp = fc_frame_alloc(lport, sizeof(*rp));
|
| 1352 | if (!fp) {
|
| 1353 | FC_EXCH_DBG(fc_seq_exch(sp),
|
| 1354 | "Drop BA_RJT request, out of memory\n");
|
| 1355 | return;
|
| 1356 | }
|
| 1357 | fh = fc_frame_header_get(fp);
|
| 1358 | rx_fh = fc_frame_header_get(rx_fp);
|
| 1359 |
|
| 1360 | memset(fh, 0, sizeof(*fh) + sizeof(*rp));
|
| 1361 |
|
| 1362 | rp = fc_frame_payload_get(fp, sizeof(*rp));
|
| 1363 | rp->br_reason = reason;
|
| 1364 | rp->br_explan = explan;
|
| 1365 |
|
| 1366 | |
| 1367 | * seq_id, cs_ctl, df_ctl and param/offset are zero.
|
| 1368 |
|
| 1369 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3);
|
| 1370 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3);
|
| 1371 | fh->fh_ox_id = rx_fh->fh_ox_id;
|
| 1372 | fh->fh_rx_id = rx_fh->fh_rx_id;
|
| 1373 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
|
| 1374 | fh->fh_r_ctl = FC_RCTL_BA_RJT;
|
| 1375 | fh->fh_type = FC_TYPE_BLS;
|
| 1376 |
|
| 1377 | |
| 1378 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
|
| 1379 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
|
| 1380 | * Bits 9-8 are meaningful (retransmitted or unidirectional).
|
| 1381 | * Last ACK uses bits 7-6 (continue sequence),
|
| 1382 | * bits 5-4 are meaningful (what kind of ACK to use).
|
| 1383 | * Always set LAST_SEQ, END_SEQ.
|
| 1384 |
|
| 1385 | f_ctl = ntoh24(rx_fh->fh_f_ctl);
|
| 1386 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
|
| 1387 | FC_FC_END_CONN | FC_FC_SEQ_INIT |
|
| 1388 | FC_FC_RETX_SEQ | FC_FC_UNI_TX;
|
| 1389 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
|
| 1390 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
|
| 1391 | f_ctl &= ~FC_FC_FIRST_SEQ;
|
| 1392 | hton24(fh->fh_f_ctl, f_ctl);
|
| 1393 |
|
| 1394 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp));
|
| 1395 | fr_eof(fp) = FC_EOF_T;
|
| 1396 | if (fc_sof_needs_ack(fr_sof(fp)))
|
| 1397 | fr_eof(fp) = FC_EOF_N;
|
| 1398 |
|
| 1399 | lport->tt.frame_send(lport, fp);
|
| 1400 | }
|
| 1401 |
|
| 1402 | |
| 1403 | * fc_exch_recv_abts() - Handle an incoming ABTS
|
| 1404 | * @ep: The exchange the abort was on
|
| 1405 | * @rx_fp: The ABTS frame
|
| 1406 | *
|
| 1407 | * This would be for target mode usually, but could be due to lost
|
| 1408 | * FCP transfer ready, confirm or RRQ. We always handle this as an
|
| 1409 | * exchange abort, ignoring the parameter.
|
| 1410 |
|
| 1411 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp)
|
| 1412 | {
|
| 1413 | struct fc_frame *fp;
|
| 1414 | struct fc_ba_acc *ap;
|
| 1415 | struct fc_frame_header *fh;
|
| 1416 | struct fc_seq *sp;
|
| 1417 |
|
| 1418 | if (!ep)
|
| 1419 | goto reject;
|
| 1420 |
|
| 1421 | FC_EXCH_DBG(ep, "exch: ABTS received\n");
|
| 1422 | fp = fc_frame_alloc(ep->lp, sizeof(*ap));
|
| 1423 | if (!fp) {
|
| 1424 | FC_EXCH_DBG(ep, "Drop ABTS request, out of memory\n");
|
| 1425 | goto free;
|
| 1426 | }
|
| 1427 |
|
| 1428 | spin_lock_bh(&ep->ex_lock);
|
| 1429 | if (ep->esb_stat & ESB_ST_COMPLETE) {
|
| 1430 | spin_unlock_bh(&ep->ex_lock);
|
| 1431 | FC_EXCH_DBG(ep, "exch: ABTS rejected, exchange complete\n");
|
| 1432 | fc_frame_free(fp);
|
| 1433 | goto reject;
|
| 1434 | }
|
| 1435 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
|
| 1436 | ep->esb_stat |= ESB_ST_REC_QUAL;
|
| 1437 | fc_exch_hold(ep);
|
| 1438 | }
|
| 1439 | fc_exch_timer_set_locked(ep, ep->r_a_tov);
|
| 1440 | fh = fc_frame_header_get(fp);
|
| 1441 | ap = fc_frame_payload_get(fp, sizeof(*ap));
|
| 1442 | memset(ap, 0, sizeof(*ap));
|
| 1443 | sp = &ep->seq;
|
| 1444 | ap->ba_high_seq_cnt = htons(0xffff);
|
| 1445 | if (sp->ssb_stat & SSB_ST_RESP) {
|
| 1446 | ap->ba_seq_id = sp->id;
|
| 1447 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL;
|
| 1448 | ap->ba_high_seq_cnt = fh->fh_seq_cnt;
|
| 1449 | ap->ba_low_seq_cnt = htons(sp->cnt);
|
| 1450 | }
|
| 1451 | sp = fc_seq_start_next_locked(sp);
|
| 1452 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS);
|
| 1453 | ep->esb_stat |= ESB_ST_ABNORMAL;
|
| 1454 | spin_unlock_bh(&ep->ex_lock);
|
| 1455 |
|
| 1456 | free:
|
| 1457 | fc_frame_free(rx_fp);
|
| 1458 | return;
|
| 1459 |
|
| 1460 | reject:
|
| 1461 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID);
|
| 1462 | goto free;
|
| 1463 | }
|
| 1464 |
|
| 1465 | |
| 1466 | * fc_seq_assign() - Assign exchange and sequence for incoming request
|
| 1467 | * @lport: The local port that received the request
|
| 1468 | * @fp: The request frame
|
| 1469 | *
|
| 1470 | * On success, the sequence pointer will be returned and also in fr_seq(@fp).
|
| 1471 | * A reference will be held on the exchange/sequence for the caller, which
|
| 1472 | * must call fc_seq_release().
|
| 1473 |
|
| 1474 | struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp)
|
| 1475 | {
|
| 1476 | struct fc_exch_mgr_anchor *ema;
|
| 1477 |
|
| 1478 | WARN_ON(lport != fr_dev(fp));
|
| 1479 | WARN_ON(fr_seq(fp));
|
| 1480 | fr_seq(fp) = NULL;
|
| 1481 |
|
| 1482 | list_for_each_entry(ema, &lport->ema_list, ema_list)
|
| 1483 | if ((!ema->match || ema->match(fp)) &&
|
| 1484 | fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE)
|
| 1485 | break;
|
| 1486 | return fr_seq(fp);
|
| 1487 | }
|
| 1488 | EXPORT_SYMBOL(fc_seq_assign);
|
| 1489 |
|
| 1490 | |
| 1491 | * fc_seq_release() - Release the hold
|
| 1492 | * @sp: The sequence.
|
| 1493 |
|
| 1494 | void fc_seq_release(struct fc_seq *sp)
|
| 1495 | {
|
| 1496 | fc_exch_release(fc_seq_exch(sp));
|
| 1497 | }
|
| 1498 | EXPORT_SYMBOL(fc_seq_release);
|
| 1499 |
|
| 1500 | |
| 1501 | * fc_exch_recv_req() - Handler for an incoming request
|
| 1502 | * @lport: The local port that received the request
|
| 1503 | * @mp: The EM that the exchange is on
|
| 1504 | * @fp: The request frame
|
| 1505 | *
|
| 1506 | * This is used when the other end is originating the exchange
|
| 1507 | * and the sequence.
|
| 1508 |
|
| 1509 | static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp,
|
| 1510 | struct fc_frame *fp)
|
| 1511 | {
|
| 1512 | struct fc_frame_header *fh = fc_frame_header_get(fp);
|
| 1513 | struct fc_seq *sp = NULL;
|
| 1514 | struct fc_exch *ep = NULL;
|
| 1515 | enum fc_pf_rjt_reason reject;
|
| 1516 |
|
| 1517 | |
| 1518 | * problem now that we know a new exchange needs to be allocated
|
| 1519 |
|
| 1520 | lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id));
|
| 1521 | if (!lport) {
|
| 1522 | fc_frame_free(fp);
|
| 1523 | return;
|
| 1524 | }
|
| 1525 | fr_dev(fp) = lport;
|
| 1526 |
|
| 1527 | BUG_ON(fr_seq(fp));
|
| 1528 |
|
| 1529 | |
| 1530 | * If the RX_ID is 0xffff, don't allocate an exchange.
|
| 1531 | * The upper-level protocol may request one later, if needed.
|
| 1532 |
|
| 1533 | if (fh->fh_rx_id == htons(FC_XID_UNKNOWN))
|
| 1534 | return fc_lport_recv(lport, fp);
|
| 1535 |
|
| 1536 | reject = fc_seq_lookup_recip(lport, mp, fp);
|
| 1537 | if (reject == FC_RJT_NONE) {
|
| 1538 | sp = fr_seq(fp);
|
| 1539 | ep = fc_seq_exch(sp);
|
| 1540 | fc_seq_send_ack(sp, fp);
|
| 1541 | ep->encaps = fr_encaps(fp);
|
| 1542 |
|
| 1543 | |
| 1544 | * Call the receive function.
|
| 1545 | *
|
| 1546 | * The receive function may allocate a new sequence
|
| 1547 | * over the old one, so we shouldn't change the
|
| 1548 | * sequence after this.
|
| 1549 | *
|
| 1550 | * The frame will be freed by the receive function.
|
| 1551 | * If new exch resp handler is valid then call that
|
| 1552 | * first.
|
| 1553 |
|
| 1554 | if (!fc_invoke_resp(ep, sp, fp))
|
| 1555 | fc_lport_recv(lport, fp);
|
| 1556 | fc_exch_release(ep);
|
| 1557 | } else {
|
| 1558 | FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n",
|
| 1559 | reject);
|
| 1560 | fc_frame_free(fp);
|
| 1561 | }
|
| 1562 | }
|
| 1563 |
|
| 1564 | |
| 1565 | * fc_exch_recv_seq_resp() - Handler for an incoming response where the other
|
| 1566 | * end is the originator of the sequence that is a
|
| 1567 | * response to our initial exchange
|
| 1568 | * @mp: The EM that the exchange is on
|
| 1569 | * @fp: The response frame
|
| 1570 |
|
| 1571 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
|
| 1572 | {
|
| 1573 | struct fc_frame_header *fh = fc_frame_header_get(fp);
|
| 1574 | struct fc_seq *sp;
|
| 1575 | struct fc_exch *ep;
|
| 1576 | enum fc_sof sof;
|
| 1577 | u32 f_ctl;
|
| 1578 | int rc;
|
| 1579 |
|
| 1580 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id));
|
| 1581 | if (!ep) {
|
| 1582 | atomic_inc(&mp->stats.xid_not_found);
|
| 1583 | goto out;
|
| 1584 | }
|
| 1585 | if (ep->esb_stat & ESB_ST_COMPLETE) {
|
| 1586 | atomic_inc(&mp->stats.xid_not_found);
|
| 1587 | goto rel;
|
| 1588 | }
|
| 1589 | if (ep->rxid == FC_XID_UNKNOWN)
|
| 1590 | ep->rxid = ntohs(fh->fh_rx_id);
|
| 1591 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) {
|
| 1592 | atomic_inc(&mp->stats.xid_not_found);
|
| 1593 | goto rel;
|
| 1594 | }
|
| 1595 | if (ep->did != ntoh24(fh->fh_s_id) &&
|
| 1596 | ep->did != FC_FID_FLOGI) {
|
| 1597 | atomic_inc(&mp->stats.xid_not_found);
|
| 1598 | goto rel;
|
| 1599 | }
|
| 1600 | sof = fr_sof(fp);
|
| 1601 | sp = &ep->seq;
|
| 1602 | if (fc_sof_is_init(sof)) {
|
| 1603 | sp->ssb_stat |= SSB_ST_RESP;
|
| 1604 | sp->id = fh->fh_seq_id;
|
| 1605 | }
|
| 1606 |
|
| 1607 | f_ctl = ntoh24(fh->fh_f_ctl);
|
| 1608 | fr_seq(fp) = sp;
|
| 1609 |
|
| 1610 | spin_lock_bh(&ep->ex_lock);
|
| 1611 | if (f_ctl & FC_FC_SEQ_INIT)
|
| 1612 | ep->esb_stat |= ESB_ST_SEQ_INIT;
|
| 1613 | spin_unlock_bh(&ep->ex_lock);
|
| 1614 |
|
| 1615 | if (fc_sof_needs_ack(sof))
|
| 1616 | fc_seq_send_ack(sp, fp);
|
| 1617 |
|
| 1618 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T &&
|
| 1619 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
|
| 1620 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
|
| 1621 | spin_lock_bh(&ep->ex_lock);
|
| 1622 | rc = fc_exch_done_locked(ep);
|
| 1623 | WARN_ON(fc_seq_exch(sp) != ep);
|
| 1624 | spin_unlock_bh(&ep->ex_lock);
|
| 1625 | if (!rc) {
|
| 1626 | fc_exch_delete(ep);
|
| 1627 | } else {
|
| 1628 | FC_EXCH_DBG(ep, "ep is completed already,"
|
| 1629 | "hence skip calling the resp\n");
|
| 1630 | goto skip_resp;
|
| 1631 | }
|
| 1632 | }
|
| 1633 |
|
| 1634 | |
| 1635 | * Call the receive function.
|
| 1636 | * The sequence is held (has a refcnt) for us,
|
| 1637 | * but not for the receive function.
|
| 1638 | *
|
| 1639 | * The receive function may allocate a new sequence
|
| 1640 | * over the old one, so we shouldn't change the
|
| 1641 | * sequence after this.
|
| 1642 | *
|
| 1643 | * The frame will be freed by the receive function.
|
| 1644 | * If new exch resp handler is valid then call that
|
| 1645 | * first.
|
| 1646 |
|
| 1647 | if (!fc_invoke_resp(ep, sp, fp))
|
| 1648 | fc_frame_free(fp);
|
| 1649 |
|
| 1650 | skip_resp:
|
| 1651 | fc_exch_release(ep);
|
| 1652 | return;
|
| 1653 | rel:
|
| 1654 | fc_exch_release(ep);
|
| 1655 | out:
|
| 1656 | fc_frame_free(fp);
|
| 1657 | }
|
| 1658 |
|
| 1659 | |
| 1660 | * fc_exch_recv_resp() - Handler for a sequence where other end is
|
| 1661 | * responding to our sequence
|
| 1662 | * @mp: The EM that the exchange is on
|
| 1663 | * @fp: The response frame
|
| 1664 |
|
| 1665 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
|
| 1666 | {
|
| 1667 | struct fc_seq *sp;
|
| 1668 |
|
| 1669 | sp = fc_seq_lookup_orig(mp, fp);
|
| 1670 |
|
| 1671 | if (!sp)
|
| 1672 | atomic_inc(&mp->stats.xid_not_found);
|
| 1673 | else
|
| 1674 | atomic_inc(&mp->stats.non_bls_resp);
|
| 1675 |
|
| 1676 | fc_frame_free(fp);
|
| 1677 | }
|
| 1678 |
|
| 1679 | |
| 1680 | * fc_exch_abts_resp() - Handler for a response to an ABT
|
| 1681 | * @ep: The exchange that the frame is on
|
| 1682 | * @fp: The response frame
|
| 1683 | *
|
| 1684 | * This response would be to an ABTS cancelling an exchange or sequence.
|
| 1685 | * The response can be either BA_ACC or BA_RJT
|
| 1686 |
|
| 1687 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp)
|
| 1688 | {
|
| 1689 | struct fc_frame_header *fh;
|
| 1690 | struct fc_ba_acc *ap;
|
| 1691 | struct fc_seq *sp;
|
| 1692 | u16 low;
|
| 1693 | u16 high;
|
| 1694 | int rc = 1, has_rec = 0;
|
| 1695 |
|
| 1696 | fh = fc_frame_header_get(fp);
|
| 1697 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl,
|
| 1698 | fc_exch_rctl_name(fh->fh_r_ctl));
|
| 1699 |
|
| 1700 | if (cancel_delayed_work_sync(&ep->timeout_work)) {
|
| 1701 | FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n");
|
| 1702 | fc_exch_release(ep);
|
| 1703 | return;
|
| 1704 | }
|
| 1705 |
|
| 1706 | spin_lock_bh(&ep->ex_lock);
|
| 1707 | switch (fh->fh_r_ctl) {
|
| 1708 | case FC_RCTL_BA_ACC:
|
| 1709 | ap = fc_frame_payload_get(fp, sizeof(*ap));
|
| 1710 | if (!ap)
|
| 1711 | break;
|
| 1712 |
|
| 1713 | |
| 1714 | * Decide whether to establish a Recovery Qualifier.
|
| 1715 | * We do this if there is a non-empty SEQ_CNT range and
|
| 1716 | * SEQ_ID is the same as the one we aborted.
|
| 1717 |
|
| 1718 | low = ntohs(ap->ba_low_seq_cnt);
|
| 1719 | high = ntohs(ap->ba_high_seq_cnt);
|
| 1720 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 &&
|
| 1721 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL ||
|
| 1722 | ap->ba_seq_id == ep->seq_id) && low != high) {
|
| 1723 | ep->esb_stat |= ESB_ST_REC_QUAL;
|
| 1724 | fc_exch_hold(ep);
|
| 1725 | has_rec = 1;
|
| 1726 | }
|
| 1727 | break;
|
| 1728 | case FC_RCTL_BA_RJT:
|
| 1729 | break;
|
| 1730 | default:
|
| 1731 | break;
|
| 1732 | }
|
| 1733 |
|
| 1734 | |
| 1735 | * fc_exch_recv_seq_resp
|
| 1736 |
|
| 1737 | sp = &ep->seq;
|
| 1738 | |
| 1739 | * do we want to check END_SEQ as well as LAST_SEQ here?
|
| 1740 |
|
| 1741 | if (ep->fh_type != FC_TYPE_FCP &&
|
| 1742 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ)
|
| 1743 | rc = fc_exch_done_locked(ep);
|
| 1744 | spin_unlock_bh(&ep->ex_lock);
|
| 1745 |
|
| 1746 | fc_exch_hold(ep);
|
| 1747 | if (!rc)
|
| 1748 | fc_exch_delete(ep);
|
| 1749 | if (!fc_invoke_resp(ep, sp, fp))
|
| 1750 | fc_frame_free(fp);
|
| 1751 | if (has_rec)
|
| 1752 | fc_exch_timer_set(ep, ep->r_a_tov);
|
| 1753 | fc_exch_release(ep);
|
| 1754 | }
|
| 1755 |
|
| 1756 | |
| 1757 | * fc_exch_recv_bls() - Handler for a BLS sequence
|
| 1758 | * @mp: The EM that the exchange is on
|
| 1759 | * @fp: The request frame
|
| 1760 | *
|
| 1761 | * The BLS frame is always a sequence initiated by the remote side.
|
| 1762 | * We may be either the originator or recipient of the exchange.
|
| 1763 |
|
| 1764 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp)
|
| 1765 | {
|
| 1766 | struct fc_frame_header *fh;
|
| 1767 | struct fc_exch *ep;
|
| 1768 | u32 f_ctl;
|
| 1769 |
|
| 1770 | fh = fc_frame_header_get(fp);
|
| 1771 | f_ctl = ntoh24(fh->fh_f_ctl);
|
| 1772 | fr_seq(fp) = NULL;
|
| 1773 |
|
| 1774 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ?
|
| 1775 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id));
|
| 1776 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) {
|
| 1777 | spin_lock_bh(&ep->ex_lock);
|
| 1778 | ep->esb_stat |= ESB_ST_SEQ_INIT;
|
| 1779 | spin_unlock_bh(&ep->ex_lock);
|
| 1780 | }
|
| 1781 | if (f_ctl & FC_FC_SEQ_CTX) {
|
| 1782 | |
| 1783 | * A response to a sequence we initiated.
|
| 1784 | * This should only be ACKs for class 2 or F.
|
| 1785 |
|
| 1786 | switch (fh->fh_r_ctl) {
|
| 1787 | case FC_RCTL_ACK_1:
|
| 1788 | case FC_RCTL_ACK_0:
|
| 1789 | break;
|
| 1790 | default:
|
| 1791 | if (ep)
|
| 1792 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received\n",
|
| 1793 | fh->fh_r_ctl,
|
| 1794 | fc_exch_rctl_name(fh->fh_r_ctl));
|
| 1795 | break;
|
| 1796 | }
|
| 1797 | fc_frame_free(fp);
|
| 1798 | } else {
|
| 1799 | switch (fh->fh_r_ctl) {
|
| 1800 | case FC_RCTL_BA_RJT:
|
| 1801 | case FC_RCTL_BA_ACC:
|
| 1802 | if (ep)
|
| 1803 | fc_exch_abts_resp(ep, fp);
|
| 1804 | else
|
| 1805 | fc_frame_free(fp);
|
| 1806 | break;
|
| 1807 | case FC_RCTL_BA_ABTS:
|
| 1808 | if (ep)
|
| 1809 | fc_exch_recv_abts(ep, fp);
|
| 1810 | else
|
| 1811 | fc_frame_free(fp);
|
| 1812 | break;
|
| 1813 | default:
|
| 1814 | fc_frame_free(fp);
|
| 1815 | break;
|
| 1816 | }
|
| 1817 | }
|
| 1818 | if (ep)
|
| 1819 | fc_exch_release(ep);
|
| 1820 | }
|
| 1821 |
|
| 1822 | |
| 1823 | * fc_seq_ls_acc() - Accept sequence with LS_ACC
|
| 1824 | * @rx_fp: The received frame, not freed here.
|
| 1825 | *
|
| 1826 | * If this fails due to allocation or transmit congestion, assume the
|
| 1827 | * originator will repeat the sequence.
|
| 1828 |
|
| 1829 | static void fc_seq_ls_acc(struct fc_frame *rx_fp)
|
| 1830 | {
|
| 1831 | struct fc_lport *lport;
|
| 1832 | struct fc_els_ls_acc *acc;
|
| 1833 | struct fc_frame *fp;
|
| 1834 | struct fc_seq *sp;
|
| 1835 |
|
| 1836 | lport = fr_dev(rx_fp);
|
| 1837 | sp = fr_seq(rx_fp);
|
| 1838 | fp = fc_frame_alloc(lport, sizeof(*acc));
|
| 1839 | if (!fp) {
|
| 1840 | FC_EXCH_DBG(fc_seq_exch(sp),
|
| 1841 | "exch: drop LS_ACC, out of memory\n");
|
| 1842 | return;
|
| 1843 | }
|
| 1844 | acc = fc_frame_payload_get(fp, sizeof(*acc));
|
| 1845 | memset(acc, 0, sizeof(*acc));
|
| 1846 | acc->la_cmd = ELS_LS_ACC;
|
| 1847 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
|
| 1848 | lport->tt.frame_send(lport, fp);
|
| 1849 | }
|
| 1850 |
|
| 1851 | |
| 1852 | * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT
|
| 1853 | * @rx_fp: The received frame, not freed here.
|
| 1854 | * @reason: The reason the sequence is being rejected
|
| 1855 | * @explan: The explanation for the rejection
|
| 1856 | *
|
| 1857 | * If this fails due to allocation or transmit congestion, assume the
|
| 1858 | * originator will repeat the sequence.
|
| 1859 |
|
| 1860 | static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason,
|
| 1861 | enum fc_els_rjt_explan explan)
|
| 1862 | {
|
| 1863 | struct fc_lport *lport;
|
| 1864 | struct fc_els_ls_rjt *rjt;
|
| 1865 | struct fc_frame *fp;
|
| 1866 | struct fc_seq *sp;
|
| 1867 |
|
| 1868 | lport = fr_dev(rx_fp);
|
| 1869 | sp = fr_seq(rx_fp);
|
| 1870 | fp = fc_frame_alloc(lport, sizeof(*rjt));
|
| 1871 | if (!fp) {
|
| 1872 | FC_EXCH_DBG(fc_seq_exch(sp),
|
| 1873 | "exch: drop LS_ACC, out of memory\n");
|
| 1874 | return;
|
| 1875 | }
|
| 1876 | rjt = fc_frame_payload_get(fp, sizeof(*rjt));
|
| 1877 | memset(rjt, 0, sizeof(*rjt));
|
| 1878 | rjt->er_cmd = ELS_LS_RJT;
|
| 1879 | rjt->er_reason = reason;
|
| 1880 | rjt->er_explan = explan;
|
| 1881 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
|
| 1882 | lport->tt.frame_send(lport, fp);
|
| 1883 | }
|
| 1884 |
|
| 1885 | |
| 1886 | * fc_exch_reset() - Reset an exchange
|
| 1887 | * @ep: The exchange to be reset
|
| 1888 | *
|
| 1889 | * Note: May sleep if invoked from outside a response handler.
|
| 1890 |
|
| 1891 | static void fc_exch_reset(struct fc_exch *ep)
|
| 1892 | {
|
| 1893 | struct fc_seq *sp;
|
| 1894 | int rc = 1;
|
| 1895 |
|
| 1896 | spin_lock_bh(&ep->ex_lock);
|
| 1897 | ep->state |= FC_EX_RST_CLEANUP;
|
| 1898 | fc_exch_timer_cancel(ep);
|
| 1899 | if (ep->esb_stat & ESB_ST_REC_QUAL)
|
| 1900 | atomic_dec(&ep->ex_refcnt);
|
| 1901 | ep->esb_stat &= ~ESB_ST_REC_QUAL;
|
| 1902 | sp = &ep->seq;
|
| 1903 | rc = fc_exch_done_locked(ep);
|
| 1904 | spin_unlock_bh(&ep->ex_lock);
|
| 1905 |
|
| 1906 | fc_exch_hold(ep);
|
| 1907 |
|
| 1908 | if (!rc) {
|
| 1909 | fc_exch_delete(ep);
|
| 1910 | } else {
|
| 1911 | FC_EXCH_DBG(ep, "ep is completed already,"
|
| 1912 | "hence skip calling the resp\n");
|
| 1913 | goto skip_resp;
|
| 1914 | }
|
| 1915 |
|
| 1916 | fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_CLOSED));
|
| 1917 | skip_resp:
|
| 1918 | fc_seq_set_resp(sp, NULL, ep->arg);
|
| 1919 | fc_exch_release(ep);
|
| 1920 | }
|
| 1921 |
|
| 1922 | |
| 1923 | * fc_exch_pool_reset() - Reset a per cpu exchange pool
|
| 1924 | * @lport: The local port that the exchange pool is on
|
| 1925 | * @pool: The exchange pool to be reset
|
| 1926 | * @sid: The source ID
|
| 1927 | * @did: The destination ID
|
| 1928 | *
|
| 1929 | * Resets a per cpu exches pool, releasing all of its sequences
|
| 1930 | * and exchanges. If sid is non-zero then reset only exchanges
|
| 1931 | * we sourced from the local port's FID. If did is non-zero then
|
| 1932 | * only reset exchanges destined for the local port's FID.
|
| 1933 |
|
| 1934 | static void fc_exch_pool_reset(struct fc_lport *lport,
|
| 1935 | struct fc_exch_pool *pool,
|
| 1936 | u32 sid, u32 did)
|
| 1937 | {
|
| 1938 | struct fc_exch *ep;
|
| 1939 | struct fc_exch *next;
|
| 1940 |
|
| 1941 | spin_lock_bh(&pool->lock);
|
| 1942 | restart:
|
| 1943 | list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) {
|
| 1944 | if ((lport == ep->lp) &&
|
| 1945 | (sid == 0 || sid == ep->sid) &&
|
| 1946 | (did == 0 || did == ep->did)) {
|
| 1947 | fc_exch_hold(ep);
|
| 1948 | spin_unlock_bh(&pool->lock);
|
| 1949 |
|
| 1950 | fc_exch_reset(ep);
|
| 1951 |
|
| 1952 | fc_exch_release(ep);
|
| 1953 | spin_lock_bh(&pool->lock);
|
| 1954 |
|
| 1955 | |
| 1956 | * must restart loop incase while lock
|
| 1957 | * was down multiple eps were released.
|
| 1958 |
|
| 1959 | goto restart;
|
| 1960 | }
|
| 1961 | }
|
| 1962 | pool->next_index = 0;
|
| 1963 | pool->left = FC_XID_UNKNOWN;
|
| 1964 | pool->right = FC_XID_UNKNOWN;
|
| 1965 | spin_unlock_bh(&pool->lock);
|
| 1966 | }
|
| 1967 |
|
| 1968 | |
| 1969 | * fc_exch_mgr_reset() - Reset all EMs of a local port
|
| 1970 | * @lport: The local port whose EMs are to be reset
|
| 1971 | * @sid: The source ID
|
| 1972 | * @did: The destination ID
|
| 1973 | *
|
| 1974 | * Reset all EMs associated with a given local port. Release all
|
| 1975 | * sequences and exchanges. If sid is non-zero then reset only the
|
| 1976 | * exchanges sent from the local port's FID. If did is non-zero then
|
| 1977 | * reset only exchanges destined for the local port's FID.
|
| 1978 |
|
| 1979 | void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did)
|
| 1980 | {
|
| 1981 | struct fc_exch_mgr_anchor *ema;
|
| 1982 | unsigned int cpu;
|
| 1983 |
|
| 1984 | list_for_each_entry(ema, &lport->ema_list, ema_list) {
|
| 1985 | for_each_possible_cpu(cpu)
|
| 1986 | fc_exch_pool_reset(lport,
|
| 1987 | per_cpu_ptr(ema->mp->pool, cpu),
|
| 1988 | sid, did);
|
| 1989 | }
|
| 1990 | }
|
| 1991 | EXPORT_SYMBOL(fc_exch_mgr_reset);
|
| 1992 |
|
| 1993 | |
| 1994 | * fc_exch_lookup() - find an exchange
|
| 1995 | * @lport: The local port
|
| 1996 | * @xid: The exchange ID
|
| 1997 | *
|
| 1998 | * Returns exchange pointer with hold for caller, or NULL if not found.
|
| 1999 |
|
| 2000 | static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid)
|
| 2001 | {
|
| 2002 | struct fc_exch_mgr_anchor *ema;
|
| 2003 |
|
| 2004 | list_for_each_entry(ema, &lport->ema_list, ema_list)
|
| 2005 | if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid)
|
| 2006 | return fc_exch_find(ema->mp, xid);
|
| 2007 | return NULL;
|
| 2008 | }
|
| 2009 |
|
| 2010 | |
| 2011 | * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests
|
| 2012 | * @rfp: The REC frame, not freed here.
|
| 2013 | *
|
| 2014 | * Note that the requesting port may be different than the S_ID in the request.
|
| 2015 |
|
| 2016 | static void fc_exch_els_rec(struct fc_frame *rfp)
|
| 2017 | {
|
| 2018 | struct fc_lport *lport;
|
| 2019 | struct fc_frame *fp;
|
| 2020 | struct fc_exch *ep;
|
| 2021 | struct fc_els_rec *rp;
|
| 2022 | struct fc_els_rec_acc *acc;
|
| 2023 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC;
|
| 2024 | enum fc_els_rjt_explan explan;
|
| 2025 | u32 sid;
|
| 2026 | u16 xid, rxid, oxid;
|
| 2027 |
|
| 2028 | lport = fr_dev(rfp);
|
| 2029 | rp = fc_frame_payload_get(rfp, sizeof(*rp));
|
| 2030 | explan = ELS_EXPL_INV_LEN;
|
| 2031 | if (!rp)
|
| 2032 | goto reject;
|
| 2033 | sid = ntoh24(rp->rec_s_id);
|
| 2034 | rxid = ntohs(rp->rec_rx_id);
|
| 2035 | oxid = ntohs(rp->rec_ox_id);
|
| 2036 |
|
| 2037 | explan = ELS_EXPL_OXID_RXID;
|
| 2038 | if (sid == fc_host_port_id(lport->host))
|
| 2039 | xid = oxid;
|
| 2040 | else
|
| 2041 | xid = rxid;
|
| 2042 | if (xid == FC_XID_UNKNOWN) {
|
| 2043 | FC_LPORT_DBG(lport,
|
| 2044 | "REC request from %x: invalid rxid %x oxid %x\n",
|
| 2045 | sid, rxid, oxid);
|
| 2046 | goto reject;
|
| 2047 | }
|
| 2048 | ep = fc_exch_lookup(lport, xid);
|
| 2049 | if (!ep) {
|
| 2050 | FC_LPORT_DBG(lport,
|
| 2051 | "REC request from %x: rxid %x oxid %x not found\n",
|
| 2052 | sid, rxid, oxid);
|
| 2053 | goto reject;
|
| 2054 | }
|
| 2055 | FC_EXCH_DBG(ep, "REC request from %x: rxid %x oxid %x\n",
|
| 2056 | sid, rxid, oxid);
|
| 2057 | if (ep->oid != sid || oxid != ep->oxid)
|
| 2058 | goto rel;
|
| 2059 | if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid)
|
| 2060 | goto rel;
|
| 2061 | fp = fc_frame_alloc(lport, sizeof(*acc));
|
| 2062 | if (!fp) {
|
| 2063 | FC_EXCH_DBG(ep, "Drop REC request, out of memory\n");
|
| 2064 | goto out;
|
| 2065 | }
|
| 2066 |
|
| 2067 | acc = fc_frame_payload_get(fp, sizeof(*acc));
|
| 2068 | memset(acc, 0, sizeof(*acc));
|
| 2069 | acc->reca_cmd = ELS_LS_ACC;
|
| 2070 | acc->reca_ox_id = rp->rec_ox_id;
|
| 2071 | memcpy(acc->reca_ofid, rp->rec_s_id, 3);
|
| 2072 | acc->reca_rx_id = htons(ep->rxid);
|
| 2073 | if (ep->sid == ep->oid)
|
| 2074 | hton24(acc->reca_rfid, ep->did);
|
| 2075 | else
|
| 2076 | hton24(acc->reca_rfid, ep->sid);
|
| 2077 | acc->reca_fc4value = htonl(ep->seq.rec_data);
|
| 2078 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP |
|
| 2079 | ESB_ST_SEQ_INIT |
|
| 2080 | ESB_ST_COMPLETE));
|
| 2081 | fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0);
|
| 2082 | lport->tt.frame_send(lport, fp);
|
| 2083 | out:
|
| 2084 | fc_exch_release(ep);
|
| 2085 | return;
|
| 2086 |
|
| 2087 | rel:
|
| 2088 | fc_exch_release(ep);
|
| 2089 | reject:
|
| 2090 | fc_seq_ls_rjt(rfp, reason, explan);
|
| 2091 | }
|
| 2092 |
|
| 2093 | |
| 2094 | * fc_exch_rrq_resp() - Handler for RRQ responses
|
| 2095 | * @sp: The sequence that the RRQ is on
|
| 2096 | * @fp: The RRQ frame
|
| 2097 | * @arg: The exchange that the RRQ is on
|
| 2098 | *
|
| 2099 | * TODO: fix error handler.
|
| 2100 |
|
| 2101 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg)
|
| 2102 | {
|
| 2103 | struct fc_exch *aborted_ep = arg;
|
| 2104 | unsigned int op;
|
| 2105 |
|
| 2106 | if (IS_ERR(fp)) {
|
| 2107 | int err = PTR_ERR(fp);
|
| 2108 |
|
| 2109 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT)
|
| 2110 | goto cleanup;
|
| 2111 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, "
|
| 2112 | "frame error %d\n", err);
|
| 2113 | return;
|
| 2114 | }
|
| 2115 |
|
| 2116 | op = fc_frame_payload_op(fp);
|
| 2117 | fc_frame_free(fp);
|
| 2118 |
|
| 2119 | switch (op) {
|
| 2120 | case ELS_LS_RJT:
|
| 2121 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ\n");
|
| 2122 | fallthrough;
|
| 2123 | case ELS_LS_ACC:
|
| 2124 | goto cleanup;
|
| 2125 | default:
|
| 2126 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x for RRQ\n",
|
| 2127 | op);
|
| 2128 | return;
|
| 2129 | }
|
| 2130 |
|
| 2131 | cleanup:
|
| 2132 | fc_exch_done(&aborted_ep->seq);
|
| 2133 |
|
| 2134 | fc_exch_release(aborted_ep);
|
| 2135 | }
|
| 2136 |
|
| 2137 |
|
| 2138 | |
| 2139 | * fc_exch_seq_send() - Send a frame using a new exchange and sequence
|
| 2140 | * @lport: The local port to send the frame on
|
| 2141 | * @fp: The frame to be sent
|
| 2142 | * @resp: The response handler for this request
|
| 2143 | * @destructor: The destructor for the exchange
|
| 2144 | * @arg: The argument to be passed to the response handler
|
| 2145 | * @timer_msec: The timeout period for the exchange
|
| 2146 | *
|
| 2147 | * The exchange response handler is set in this routine to resp()
|
| 2148 | * function pointer. It can be called in two scenarios: if a timeout
|
| 2149 | * occurs or if a response frame is received for the exchange. The
|
| 2150 | * fc_frame pointer in response handler will also indicate timeout
|
| 2151 | * as error using IS_ERR related macros.
|
| 2152 | *
|
| 2153 | * The exchange destructor handler is also set in this routine.
|
| 2154 | * The destructor handler is invoked by EM layer when exchange
|
| 2155 | * is about to free, this can be used by caller to free its
|
| 2156 | * resources along with exchange free.
|
| 2157 | *
|
| 2158 | * The arg is passed back to resp and destructor handler.
|
| 2159 | *
|
| 2160 | * The timeout value (in msec) for an exchange is set if non zero
|
| 2161 | * timer_msec argument is specified. The timer is canceled when
|
| 2162 | * it fires or when the exchange is done. The exchange timeout handler
|
| 2163 | * is registered by EM layer.
|
| 2164 | *
|
| 2165 | * The frame pointer with some of the header's fields must be
|
| 2166 | * filled before calling this routine, those fields are:
|
| 2167 | *
|
| 2168 | * - routing control
|
| 2169 | * - FC port did
|
| 2170 | * - FC port sid
|
| 2171 | * - FC header type
|
| 2172 | * - frame control
|
| 2173 | * - parameter or relative offset
|
| 2174 |
|
| 2175 | struct fc_seq *fc_exch_seq_send(struct fc_lport *lport,
|
| 2176 | struct fc_frame *fp,
|
| 2177 | void (*resp)(struct fc_seq *,
|
| 2178 | struct fc_frame *fp,
|
| 2179 | void *arg),
|
| 2180 | void (*destructor)(struct fc_seq *, void *),
|
| 2181 | void *arg, u32 timer_msec)
|
| 2182 | {
|
| 2183 | struct fc_exch *ep;
|
| 2184 | struct fc_seq *sp = NULL;
|
| 2185 | struct fc_frame_header *fh;
|
| 2186 | struct fc_fcp_pkt *fsp = NULL;
|
| 2187 | int rc = 1;
|
| 2188 |
|
| 2189 | ep = fc_exch_alloc(lport, fp);
|
| 2190 | if (!ep) {
|
| 2191 | fc_frame_free(fp);
|
| 2192 | return NULL;
|
| 2193 | }
|
| 2194 | ep->esb_stat |= ESB_ST_SEQ_INIT;
|
| 2195 | fh = fc_frame_header_get(fp);
|
| 2196 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id));
|
| 2197 | ep->resp = resp;
|
| 2198 | ep->destructor = destructor;
|
| 2199 | ep->arg = arg;
|
| 2200 | ep->r_a_tov = lport->r_a_tov;
|
| 2201 | ep->lp = lport;
|
| 2202 | sp = &ep->seq;
|
| 2203 |
|
| 2204 | ep->fh_type = fh->fh_type;
|
| 2205 | ep->f_ctl = ntoh24(fh->fh_f_ctl);
|
| 2206 | fc_exch_setup_hdr(ep, fp, ep->f_ctl);
|
| 2207 | sp->cnt++;
|
| 2208 |
|
| 2209 | if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) {
|
| 2210 | fsp = fr_fsp(fp);
|
| 2211 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid);
|
| 2212 | }
|
| 2213 |
|
| 2214 | if (unlikely(lport->tt.frame_send(lport, fp)))
|
| 2215 | goto err;
|
| 2216 |
|
| 2217 | if (timer_msec)
|
| 2218 | fc_exch_timer_set_locked(ep, timer_msec);
|
| 2219 | ep->f_ctl &= ~FC_FC_FIRST_SEQ;
|
| 2220 |
|
| 2221 | if (ep->f_ctl & FC_FC_SEQ_INIT)
|
| 2222 | ep->esb_stat &= ~ESB_ST_SEQ_INIT;
|
| 2223 | spin_unlock_bh(&ep->ex_lock);
|
| 2224 | return sp;
|
| 2225 | err:
|
| 2226 | if (fsp)
|
| 2227 | fc_fcp_ddp_done(fsp);
|
| 2228 | rc = fc_exch_done_locked(ep);
|
| 2229 | spin_unlock_bh(&ep->ex_lock);
|
| 2230 | if (!rc)
|
| 2231 | fc_exch_delete(ep);
|
| 2232 | return NULL;
|
| 2233 | }
|
| 2234 | EXPORT_SYMBOL(fc_exch_seq_send);
|
| 2235 |
|
| 2236 | |
| 2237 | * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command
|
| 2238 | * @ep: The exchange to send the RRQ on
|
| 2239 | *
|
| 2240 | * This tells the remote port to stop blocking the use of
|
| 2241 | * the exchange and the seq_cnt range.
|
| 2242 |
|
| 2243 | static void fc_exch_rrq(struct fc_exch *ep)
|
| 2244 | {
|
| 2245 | struct fc_lport *lport;
|
| 2246 | struct fc_els_rrq *rrq;
|
| 2247 | struct fc_frame *fp;
|
| 2248 | u32 did;
|
| 2249 |
|
| 2250 | lport = ep->lp;
|
| 2251 |
|
| 2252 | fp = fc_frame_alloc(lport, sizeof(*rrq));
|
| 2253 | if (!fp)
|
| 2254 | goto retry;
|
| 2255 |
|
| 2256 | rrq = fc_frame_payload_get(fp, sizeof(*rrq));
|
| 2257 | memset(rrq, 0, sizeof(*rrq));
|
| 2258 | rrq->rrq_cmd = ELS_RRQ;
|
| 2259 | hton24(rrq->rrq_s_id, ep->sid);
|
| 2260 | rrq->rrq_ox_id = htons(ep->oxid);
|
| 2261 | rrq->rrq_rx_id = htons(ep->rxid);
|
| 2262 |
|
| 2263 | did = ep->did;
|
| 2264 | if (ep->esb_stat & ESB_ST_RESP)
|
| 2265 | did = ep->sid;
|
| 2266 |
|
| 2267 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did,
|
| 2268 | lport->port_id, FC_TYPE_ELS,
|
| 2269 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
|
| 2270 |
|
| 2271 | if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep,
|
| 2272 | lport->e_d_tov))
|
| 2273 | return;
|
| 2274 |
|
| 2275 | retry:
|
| 2276 | FC_EXCH_DBG(ep, "exch: RRQ send failed\n");
|
| 2277 | spin_lock_bh(&ep->ex_lock);
|
| 2278 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) {
|
| 2279 | spin_unlock_bh(&ep->ex_lock);
|
| 2280 |
|
| 2281 | fc_exch_release(ep);
|
| 2282 | return;
|
| 2283 | }
|
| 2284 | ep->esb_stat |= ESB_ST_REC_QUAL;
|
| 2285 | fc_exch_timer_set_locked(ep, ep->r_a_tov);
|
| 2286 | spin_unlock_bh(&ep->ex_lock);
|
| 2287 | }
|
| 2288 |
|
| 2289 | |
| 2290 | * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests
|
| 2291 | * @fp: The RRQ frame, not freed here.
|
| 2292 |
|
| 2293 | static void fc_exch_els_rrq(struct fc_frame *fp)
|
| 2294 | {
|
| 2295 | struct fc_lport *lport;
|
| 2296 | struct fc_exch *ep = NULL;
|
| 2297 | struct fc_els_rrq *rp;
|
| 2298 | u32 sid;
|
| 2299 | u16 xid;
|
| 2300 | enum fc_els_rjt_explan explan;
|
| 2301 |
|
| 2302 | lport = fr_dev(fp);
|
| 2303 | rp = fc_frame_payload_get(fp, sizeof(*rp));
|
| 2304 | explan = ELS_EXPL_INV_LEN;
|
| 2305 | if (!rp)
|
| 2306 | goto reject;
|
| 2307 |
|
| 2308 | |
| 2309 | * lookup subject exchange.
|
| 2310 |
|
| 2311 | sid = ntoh24(rp->rrq_s_id);
|
| 2312 | xid = fc_host_port_id(lport->host) == sid ?
|
| 2313 | ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id);
|
| 2314 | ep = fc_exch_lookup(lport, xid);
|
| 2315 | explan = ELS_EXPL_OXID_RXID;
|
| 2316 | if (!ep)
|
| 2317 | goto reject;
|
| 2318 | spin_lock_bh(&ep->ex_lock);
|
| 2319 | FC_EXCH_DBG(ep, "RRQ request from %x: xid %x rxid %x oxid %x\n",
|
| 2320 | sid, xid, ntohs(rp->rrq_rx_id), ntohs(rp->rrq_ox_id));
|
| 2321 | if (ep->oxid != ntohs(rp->rrq_ox_id))
|
| 2322 | goto unlock_reject;
|
| 2323 | if (ep->rxid != ntohs(rp->rrq_rx_id) &&
|
| 2324 | ep->rxid != FC_XID_UNKNOWN)
|
| 2325 | goto unlock_reject;
|
| 2326 | explan = ELS_EXPL_SID;
|
| 2327 | if (ep->sid != sid)
|
| 2328 | goto unlock_reject;
|
| 2329 |
|
| 2330 | |
| 2331 | * Clear Recovery Qualifier state, and cancel timer if complete.
|
| 2332 |
|
| 2333 | if (ep->esb_stat & ESB_ST_REC_QUAL) {
|
| 2334 | ep->esb_stat &= ~ESB_ST_REC_QUAL;
|
| 2335 | atomic_dec(&ep->ex_refcnt);
|
| 2336 | }
|
| 2337 | if (ep->esb_stat & ESB_ST_COMPLETE)
|
| 2338 | fc_exch_timer_cancel(ep);
|
| 2339 |
|
| 2340 | spin_unlock_bh(&ep->ex_lock);
|
| 2341 |
|
| 2342 | |
| 2343 | * Send LS_ACC.
|
| 2344 |
|
| 2345 | fc_seq_ls_acc(fp);
|
| 2346 | goto out;
|
| 2347 |
|
| 2348 | unlock_reject:
|
| 2349 | spin_unlock_bh(&ep->ex_lock);
|
| 2350 | reject:
|
| 2351 | fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan);
|
| 2352 | out:
|
| 2353 | if (ep)
|
| 2354 | fc_exch_release(ep);
|
| 2355 | }
|
| 2356 |
|
| 2357 | |
| 2358 | * fc_exch_update_stats() - update exches stats to lport
|
| 2359 | * @lport: The local port to update exchange manager stats
|
| 2360 |
|
| 2361 | void fc_exch_update_stats(struct fc_lport *lport)
|
| 2362 | {
|
| 2363 | struct fc_host_statistics *st;
|
| 2364 | struct fc_exch_mgr_anchor *ema;
|
| 2365 | struct fc_exch_mgr *mp;
|
| 2366 |
|
| 2367 | st = &lport->host_stats;
|
| 2368 |
|
| 2369 | list_for_each_entry(ema, &lport->ema_list, ema_list) {
|
| 2370 | mp = ema->mp;
|
| 2371 | st->fc_no_free_exch += atomic_read(&mp->stats.no_free_exch);
|
| 2372 | st->fc_no_free_exch_xid +=
|
| 2373 | atomic_read(&mp->stats.no_free_exch_xid);
|
| 2374 | st->fc_xid_not_found += atomic_read(&mp->stats.xid_not_found);
|
| 2375 | st->fc_xid_busy += atomic_read(&mp->stats.xid_busy);
|
| 2376 | st->fc_seq_not_found += atomic_read(&mp->stats.seq_not_found);
|
| 2377 | st->fc_non_bls_resp += atomic_read(&mp->stats.non_bls_resp);
|
| 2378 | }
|
| 2379 | }
|
| 2380 | EXPORT_SYMBOL(fc_exch_update_stats);
|
| 2381 |
|
| 2382 | |
| 2383 | * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs
|
| 2384 | * @lport: The local port to add the exchange manager to
|
| 2385 | * @mp: The exchange manager to be added to the local port
|
| 2386 | * @match: The match routine that indicates when this EM should be used
|
| 2387 |
|
| 2388 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
|
| 2389 | struct fc_exch_mgr *mp,
|
| 2390 | bool (*match)(struct fc_frame *))
|
| 2391 | {
|
| 2392 | struct fc_exch_mgr_anchor *ema;
|
| 2393 |
|
| 2394 | ema = kmalloc_obj(*ema, GFP_ATOMIC);
|
| 2395 | if (!ema)
|
| 2396 | return ema;
|
| 2397 |
|
| 2398 | ema->mp = mp;
|
| 2399 | ema->match = match;
|
| 2400 |
|
| 2401 | list_add_tail(&ema->ema_list, &lport->ema_list);
|
| 2402 | kref_get(&mp->kref);
|
| 2403 | return ema;
|
| 2404 | }
|
| 2405 | EXPORT_SYMBOL(fc_exch_mgr_add);
|
| 2406 |
|
| 2407 | |
| 2408 | * fc_exch_mgr_destroy() - Destroy an exchange manager
|
| 2409 | * @kref: The reference to the EM to be destroyed
|
| 2410 |
|
| 2411 | static void fc_exch_mgr_destroy(struct kref *kref)
|
| 2412 | {
|
| 2413 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref);
|
| 2414 |
|
| 2415 | mempool_destroy(mp->ep_pool);
|
| 2416 | free_percpu(mp->pool);
|
| 2417 | kfree(mp);
|
| 2418 | }
|
| 2419 |
|
| 2420 | |
| 2421 | * fc_exch_mgr_del() - Delete an EM from a local port's list
|
| 2422 | * @ema: The exchange manager anchor identifying the EM to be deleted
|
| 2423 |
|
| 2424 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema)
|
| 2425 | {
|
| 2426 |
|
| 2427 | list_del(&ema->ema_list);
|
| 2428 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy);
|
| 2429 | kfree(ema);
|
| 2430 | }
|
| 2431 | EXPORT_SYMBOL(fc_exch_mgr_del);
|
| 2432 |
|
| 2433 | |
| 2434 | * fc_exch_mgr_list_clone() - Share all exchange manager objects
|
| 2435 | * @src: Source lport to clone exchange managers from
|
| 2436 | * @dst: New lport that takes references to all the exchange managers
|
| 2437 |
|
| 2438 | int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst)
|
| 2439 | {
|
| 2440 | struct fc_exch_mgr_anchor *ema, *tmp;
|
| 2441 |
|
| 2442 | list_for_each_entry(ema, &src->ema_list, ema_list) {
|
| 2443 | if (!fc_exch_mgr_add(dst, ema->mp, ema->match))
|
| 2444 | goto err;
|
| 2445 | }
|
| 2446 | return 0;
|
| 2447 | err:
|
| 2448 | list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list)
|
| 2449 | fc_exch_mgr_del(ema);
|
| 2450 | return -ENOMEM;
|
| 2451 | }
|
| 2452 | EXPORT_SYMBOL(fc_exch_mgr_list_clone);
|
| 2453 |
|
| 2454 | |
| 2455 | * fc_exch_mgr_alloc() - Allocate an exchange manager
|
| 2456 | * @lport: The local port that the new EM will be associated with
|
| 2457 | * @class: The default FC class for new exchanges
|
| 2458 | * @min_xid: The minimum XID for exchanges from the new EM
|
| 2459 | * @max_xid: The maximum XID for exchanges from the new EM
|
| 2460 | * @match: The match routine for the new EM
|
| 2461 |
|
| 2462 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport,
|
| 2463 | enum fc_class class,
|
| 2464 | u16 min_xid, u16 max_xid,
|
| 2465 | bool (*match)(struct fc_frame *))
|
| 2466 | {
|
| 2467 | struct fc_exch_mgr *mp;
|
| 2468 | u16 pool_exch_range;
|
| 2469 | size_t pool_size;
|
| 2470 | unsigned int cpu;
|
| 2471 | struct fc_exch_pool *pool;
|
| 2472 |
|
| 2473 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN ||
|
| 2474 | (min_xid & fc_cpu_mask) != 0) {
|
| 2475 | FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
|
| 2476 | min_xid, max_xid);
|
| 2477 | return NULL;
|
| 2478 | }
|
| 2479 |
|
| 2480 | |
| 2481 | * allocate memory for EM
|
| 2482 |
|
| 2483 | mp = kzalloc_obj(struct fc_exch_mgr, GFP_ATOMIC);
|
| 2484 | if (!mp)
|
| 2485 | return NULL;
|
| 2486 |
|
| 2487 | mp->class = class;
|
| 2488 | mp->lport = lport;
|
| 2489 |
|
| 2490 | mp->min_xid = min_xid;
|
| 2491 |
|
| 2492 |
|
| 2493 | pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) /
|
| 2494 | sizeof(struct fc_exch *);
|
| 2495 | if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) {
|
| 2496 | mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) +
|
| 2497 | min_xid - 1;
|
| 2498 | } else {
|
| 2499 | mp->max_xid = max_xid;
|
| 2500 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) /
|
| 2501 | (fc_cpu_mask + 1);
|
| 2502 | }
|
| 2503 |
|
| 2504 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep);
|
| 2505 | if (!mp->ep_pool)
|
| 2506 | goto free_mp;
|
| 2507 |
|
| 2508 | |
| 2509 | * Setup per cpu exch pool with entire exchange id range equally
|
| 2510 | * divided across all cpus. The exch pointers array memory is
|
| 2511 | * allocated for exch range per pool.
|
| 2512 |
|
| 2513 | mp->pool_max_index = pool_exch_range - 1;
|
| 2514 |
|
| 2515 | |
| 2516 | * Allocate and initialize per cpu exch pool
|
| 2517 |
|
| 2518 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *);
|
| 2519 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool));
|
| 2520 | if (!mp->pool)
|
| 2521 | goto free_mempool;
|
| 2522 | for_each_possible_cpu(cpu) {
|
| 2523 | pool = per_cpu_ptr(mp->pool, cpu);
|
| 2524 | pool->next_index = 0;
|
| 2525 | pool->left = FC_XID_UNKNOWN;
|
| 2526 | pool->right = FC_XID_UNKNOWN;
|
| 2527 | spin_lock_init(&pool->lock);
|
| 2528 | INIT_LIST_HEAD(&pool->ex_list);
|
| 2529 | }
|
| 2530 |
|
| 2531 | kref_init(&mp->kref);
|
| 2532 | if (!fc_exch_mgr_add(lport, mp, match)) {
|
| 2533 | free_percpu(mp->pool);
|
| 2534 | goto free_mempool;
|
| 2535 | }
|
| 2536 |
|
| 2537 | |
| 2538 | * Above kref_init() sets mp->kref to 1 and then
|
| 2539 | * call to fc_exch_mgr_add incremented mp->kref again,
|
| 2540 | * so adjust that extra increment.
|
| 2541 |
|
| 2542 | kref_put(&mp->kref, fc_exch_mgr_destroy);
|
| 2543 | return mp;
|
| 2544 |
|
| 2545 | free_mempool:
|
| 2546 | mempool_destroy(mp->ep_pool);
|
| 2547 | free_mp:
|
| 2548 | kfree(mp);
|
| 2549 | return NULL;
|
| 2550 | }
|
| 2551 | EXPORT_SYMBOL(fc_exch_mgr_alloc);
|
| 2552 |
|
| 2553 | |
| 2554 | * fc_exch_mgr_free() - Free all exchange managers on a local port
|
| 2555 | * @lport: The local port whose EMs are to be freed
|
| 2556 |
|
| 2557 | void fc_exch_mgr_free(struct fc_lport *lport)
|
| 2558 | {
|
| 2559 | struct fc_exch_mgr_anchor *ema, *next;
|
| 2560 |
|
| 2561 | flush_workqueue(fc_exch_workqueue);
|
| 2562 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list)
|
| 2563 | fc_exch_mgr_del(ema);
|
| 2564 | }
|
| 2565 | EXPORT_SYMBOL(fc_exch_mgr_free);
|
| 2566 |
|
| 2567 | |
| 2568 | * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending
|
| 2569 | * upon 'xid'.
|
| 2570 | * @f_ctl: f_ctl
|
| 2571 | * @lport: The local port the frame was received on
|
| 2572 | * @fh: The received frame header
|
| 2573 |
|
| 2574 | static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl,
|
| 2575 | struct fc_lport *lport,
|
| 2576 | struct fc_frame_header *fh)
|
| 2577 | {
|
| 2578 | struct fc_exch_mgr_anchor *ema;
|
| 2579 | u16 xid;
|
| 2580 |
|
| 2581 | if (f_ctl & FC_FC_EX_CTX)
|
| 2582 | xid = ntohs(fh->fh_ox_id);
|
| 2583 | else {
|
| 2584 | xid = ntohs(fh->fh_rx_id);
|
| 2585 | if (xid == FC_XID_UNKNOWN)
|
| 2586 | return list_entry(lport->ema_list.prev,
|
| 2587 | typeof(*ema), ema_list);
|
| 2588 | }
|
| 2589 |
|
| 2590 | list_for_each_entry(ema, &lport->ema_list, ema_list) {
|
| 2591 | if ((xid >= ema->mp->min_xid) &&
|
| 2592 | (xid <= ema->mp->max_xid))
|
| 2593 | return ema;
|
| 2594 | }
|
| 2595 | return NULL;
|
| 2596 | }
|
| 2597 | |
| 2598 | * fc_exch_recv() - Handler for received frames
|
| 2599 | * @lport: The local port the frame was received on
|
| 2600 | * @fp: The received frame
|
| 2601 |
|
| 2602 | void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp)
|
| 2603 | {
|
| 2604 | struct fc_frame_header *fh = fc_frame_header_get(fp);
|
| 2605 | struct fc_exch_mgr_anchor *ema;
|
| 2606 | u32 f_ctl;
|
| 2607 |
|
| 2608 |
|
| 2609 | if (!lport || lport->state == LPORT_ST_DISABLED) {
|
| 2610 | FC_LIBFC_DBG("Receiving frames for an lport that "
|
| 2611 | "has not been initialized correctly\n");
|
| 2612 | fc_frame_free(fp);
|
| 2613 | return;
|
| 2614 | }
|
| 2615 |
|
| 2616 | f_ctl = ntoh24(fh->fh_f_ctl);
|
| 2617 | ema = fc_find_ema(f_ctl, lport, fh);
|
| 2618 | if (!ema) {
|
| 2619 | FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor,"
|
| 2620 | "fc_ctl <0x%x>, xid <0x%x>\n",
|
| 2621 | f_ctl,
|
| 2622 | (f_ctl & FC_FC_EX_CTX) ?
|
| 2623 | ntohs(fh->fh_ox_id) :
|
| 2624 | ntohs(fh->fh_rx_id));
|
| 2625 | fc_frame_free(fp);
|
| 2626 | return;
|
| 2627 | }
|
| 2628 |
|
| 2629 | |
| 2630 | * If frame is marked invalid, just drop it.
|
| 2631 |
|
| 2632 | switch (fr_eof(fp)) {
|
| 2633 | case FC_EOF_T:
|
| 2634 | if (f_ctl & FC_FC_END_SEQ)
|
| 2635 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl));
|
| 2636 | fallthrough;
|
| 2637 | case FC_EOF_N:
|
| 2638 | if (fh->fh_type == FC_TYPE_BLS)
|
| 2639 | fc_exch_recv_bls(ema->mp, fp);
|
| 2640 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) ==
|
| 2641 | FC_FC_EX_CTX)
|
| 2642 | fc_exch_recv_seq_resp(ema->mp, fp);
|
| 2643 | else if (f_ctl & FC_FC_SEQ_CTX)
|
| 2644 | fc_exch_recv_resp(ema->mp, fp);
|
| 2645 | else
|
| 2646 | fc_exch_recv_req(lport, ema->mp, fp);
|
| 2647 | break;
|
| 2648 | default:
|
| 2649 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)",
|
| 2650 | fr_eof(fp));
|
| 2651 | fc_frame_free(fp);
|
| 2652 | }
|
| 2653 | }
|
| 2654 | EXPORT_SYMBOL(fc_exch_recv);
|
| 2655 |
|
| 2656 | |
| 2657 | * fc_exch_init() - Initialize the exchange layer for a local port
|
| 2658 | * @lport: The local port to initialize the exchange layer for
|
| 2659 |
|
| 2660 | int fc_exch_init(struct fc_lport *lport)
|
| 2661 | {
|
| 2662 | if (!lport->tt.exch_mgr_reset)
|
| 2663 | lport->tt.exch_mgr_reset = fc_exch_mgr_reset;
|
| 2664 |
|
| 2665 | return 0;
|
| 2666 | }
|
| 2667 | EXPORT_SYMBOL(fc_exch_init);
|
| 2668 |
|
| 2669 | |
| 2670 | * fc_setup_exch_mgr() - Setup an exchange manager
|
| 2671 |
|
| 2672 | int fc_setup_exch_mgr(void)
|
| 2673 | {
|
| 2674 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch),
|
| 2675 | 0, SLAB_HWCACHE_ALIGN, NULL);
|
| 2676 | if (!fc_em_cachep)
|
| 2677 | return -ENOMEM;
|
| 2678 |
|
| 2679 | |
| 2680 | * Initialize fc_cpu_mask and fc_cpu_order. The
|
| 2681 | * fc_cpu_mask is set for nr_cpu_ids rounded up
|
| 2682 | * to order of 2's * power and order is stored
|
| 2683 | * in fc_cpu_order as this is later required in
|
| 2684 | * mapping between an exch id and exch array index
|
| 2685 | * in per cpu exch pool.
|
| 2686 | *
|
| 2687 | * This round up is required to align fc_cpu_mask
|
| 2688 | * to exchange id's lower bits such that all incoming
|
| 2689 | * frames of an exchange gets delivered to the same
|
| 2690 | * cpu on which exchange originated by simple bitwise
|
| 2691 | * AND operation between fc_cpu_mask and exchange id.
|
| 2692 |
|
| 2693 | fc_cpu_order = ilog2(roundup_pow_of_two(nr_cpu_ids));
|
| 2694 | fc_cpu_mask = (1 << fc_cpu_order) - 1;
|
| 2695 |
|
| 2696 | fc_exch_workqueue = alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM,
|
| 2697 | "fc_exch_workqueue");
|
| 2698 | if (!fc_exch_workqueue)
|
| 2699 | goto err;
|
| 2700 | return 0;
|
| 2701 | err:
|
| 2702 | kmem_cache_destroy(fc_em_cachep);
|
| 2703 | return -ENOMEM;
|
| 2704 | }
|
| 2705 |
|
| 2706 | |
| 2707 | * fc_destroy_exch_mgr() - Destroy an exchange manager
|
| 2708 |
|
| 2709 | void fc_destroy_exch_mgr(void)
|
| 2710 | {
|
| 2711 | destroy_workqueue(fc_exch_workqueue);
|
| 2712 | kmem_cache_destroy(fc_em_cachep);
|
| 2713 | }
|