Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright(c) 2007 Intel Corporation. All rights reserved. |
| 3 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved. |
| 4 | * Copyright(c) 2008 Mike Christie |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along with |
| 16 | * this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Maintained at www.Open-FCoE.org |
| 20 | */ |
| 21 | |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/spinlock.h> |
| 27 | #include <linux/scatterlist.h> |
| 28 | #include <linux/err.h> |
| 29 | #include <linux/crc32.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 30 | #include <linux/slab.h> |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 31 | |
| 32 | #include <scsi/scsi_tcq.h> |
| 33 | #include <scsi/scsi.h> |
| 34 | #include <scsi/scsi_host.h> |
| 35 | #include <scsi/scsi_device.h> |
| 36 | #include <scsi/scsi_cmnd.h> |
| 37 | |
| 38 | #include <scsi/fc/fc_fc2.h> |
| 39 | |
| 40 | #include <scsi/libfc.h> |
| 41 | #include <scsi/fc_encode.h> |
| 42 | |
Robert Love | 8866a5d | 2009-11-03 11:45:58 -0800 | [diff] [blame] | 43 | #include "fc_libfc.h" |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 44 | |
Robert Love | 93e6d5a | 2009-11-03 11:46:03 -0800 | [diff] [blame] | 45 | struct kmem_cache *scsi_pkt_cachep; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 46 | |
| 47 | /* SRB state definitions */ |
| 48 | #define FC_SRB_FREE 0 /* cmd is free */ |
| 49 | #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ |
| 50 | #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ |
| 51 | #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 52 | #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 53 | #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ |
| 54 | #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ |
| 55 | #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 56 | |
| 57 | #define FC_SRB_READ (1 << 1) |
| 58 | #define FC_SRB_WRITE (1 << 0) |
| 59 | |
| 60 | /* |
| 61 | * The SCp.ptr should be tested and set under the host lock. NULL indicates |
| 62 | * that the command has been retruned to the scsi layer. |
| 63 | */ |
| 64 | #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) |
| 65 | #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) |
| 66 | #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) |
| 67 | #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) |
| 68 | #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) |
| 69 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 70 | /** |
| 71 | * struct fc_fcp_internal - FCP layer internal data |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 72 | * @scsi_pkt_pool: Memory pool to draw FCP packets from |
| 73 | * @scsi_queue_lock: Protects the scsi_pkt_queue |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 74 | * @scsi_pkt_queue: Current FCP packets |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 75 | * @last_can_queue_ramp_down_time: ramp down time |
| 76 | * @last_can_queue_ramp_up_time: ramp up time |
| 77 | * @max_can_queue: max can_queue size |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 78 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 79 | struct fc_fcp_internal { |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 80 | mempool_t *scsi_pkt_pool; |
| 81 | spinlock_t scsi_queue_lock; |
| 82 | struct list_head scsi_pkt_queue; |
| 83 | unsigned long last_can_queue_ramp_down_time; |
| 84 | unsigned long last_can_queue_ramp_up_time; |
| 85 | int max_can_queue; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 86 | }; |
| 87 | |
| 88 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) |
| 89 | |
| 90 | /* |
| 91 | * function prototypes |
| 92 | * FC scsi I/O related functions |
| 93 | */ |
| 94 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); |
| 95 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); |
| 96 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); |
| 97 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); |
| 98 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 99 | static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 100 | static void fc_fcp_recovery(struct fc_fcp_pkt *); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 101 | static void fc_fcp_timeout(unsigned long); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 102 | static void fc_fcp_rec(struct fc_fcp_pkt *); |
| 103 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); |
| 104 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); |
| 105 | static void fc_io_compl(struct fc_fcp_pkt *); |
| 106 | |
| 107 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); |
| 108 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); |
| 109 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); |
| 110 | |
| 111 | /* |
| 112 | * command status codes |
| 113 | */ |
| 114 | #define FC_COMPLETE 0 |
| 115 | #define FC_CMD_ABORTED 1 |
| 116 | #define FC_CMD_RESET 2 |
| 117 | #define FC_CMD_PLOGO 3 |
| 118 | #define FC_SNS_RCV 4 |
| 119 | #define FC_TRANS_ERR 5 |
| 120 | #define FC_DATA_OVRRUN 6 |
| 121 | #define FC_DATA_UNDRUN 7 |
| 122 | #define FC_ERROR 8 |
| 123 | #define FC_HRD_ERROR 9 |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 124 | #define FC_CMD_RECOVERY 10 |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 125 | |
| 126 | /* |
| 127 | * Error recovery timeout values. |
| 128 | */ |
| 129 | #define FC_SCSI_ER_TIMEOUT (10 * HZ) |
| 130 | #define FC_SCSI_TM_TOV (10 * HZ) |
| 131 | #define FC_SCSI_REC_TOV (2 * HZ) |
| 132 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 133 | #define FC_CAN_QUEUE_PERIOD (60 * HZ) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 134 | |
| 135 | #define FC_MAX_ERROR_CNT 5 |
| 136 | #define FC_MAX_RECOV_RETRY 3 |
| 137 | |
| 138 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 |
| 139 | |
| 140 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 141 | * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
| 142 | * @lport: The local port that the FCP packet is for |
| 143 | * @gfp: GFP flags for allocation |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 144 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 145 | * Return value: fcp_pkt structure or null on allocation failure. |
| 146 | * Context: Can be called from process context, no lock is required. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 147 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 148 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 149 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 150 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 151 | struct fc_fcp_pkt *fsp; |
| 152 | |
| 153 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); |
| 154 | if (fsp) { |
| 155 | memset(fsp, 0, sizeof(*fsp)); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 156 | fsp->lp = lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 157 | atomic_set(&fsp->ref_cnt, 1); |
| 158 | init_timer(&fsp->timer); |
| 159 | INIT_LIST_HEAD(&fsp->list); |
| 160 | spin_lock_init(&fsp->scsi_pkt_lock); |
| 161 | } |
| 162 | return fsp; |
| 163 | } |
| 164 | |
| 165 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 166 | * fc_fcp_pkt_release() - Release hold on a fcp_pkt |
| 167 | * @fsp: The FCP packet to be released |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 168 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 169 | * Context: Can be called from process or interrupt context, |
| 170 | * no lock is required. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 171 | */ |
| 172 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) |
| 173 | { |
| 174 | if (atomic_dec_and_test(&fsp->ref_cnt)) { |
| 175 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); |
| 176 | |
| 177 | mempool_free(fsp, si->scsi_pkt_pool); |
| 178 | } |
| 179 | } |
| 180 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 181 | /** |
| 182 | * fc_fcp_pkt_hold() - Hold a fcp_pkt |
| 183 | * @fsp: The FCP packet to be held |
| 184 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 185 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) |
| 186 | { |
| 187 | atomic_inc(&fsp->ref_cnt); |
| 188 | } |
| 189 | |
| 190 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 191 | * fc_fcp_pkt_destory() - Release hold on a fcp_pkt |
| 192 | * @seq: The sequence that the FCP packet is on (required by destructor API) |
| 193 | * @fsp: The FCP packet to be released |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 194 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 195 | * This routine is called by a destructor callback in the exch_seq_send() |
| 196 | * routine of the libfc Transport Template. The 'struct fc_seq' is a required |
| 197 | * argument even though it is not used by this routine. |
| 198 | * |
| 199 | * Context: No locking required. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 200 | */ |
| 201 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) |
| 202 | { |
| 203 | fc_fcp_pkt_release(fsp); |
| 204 | } |
| 205 | |
| 206 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 207 | * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count |
| 208 | * @fsp: The FCP packet to be locked and incremented |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 209 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 210 | * We should only return error if we return a command to SCSI-ml before |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 211 | * getting a response. This can happen in cases where we send a abort, but |
| 212 | * do not wait for the response and the abort and command can be passing |
| 213 | * each other on the wire/network-layer. |
| 214 | * |
| 215 | * Note: this function locks the packet and gets a reference to allow |
| 216 | * callers to call the completion function while the lock is held and |
| 217 | * not have to worry about the packets refcount. |
| 218 | * |
| 219 | * TODO: Maybe we should just have callers grab/release the lock and |
| 220 | * have a function that they call to verify the fsp and grab a ref if |
| 221 | * needed. |
| 222 | */ |
| 223 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) |
| 224 | { |
| 225 | spin_lock_bh(&fsp->scsi_pkt_lock); |
| 226 | if (fsp->state & FC_SRB_COMPL) { |
| 227 | spin_unlock_bh(&fsp->scsi_pkt_lock); |
| 228 | return -EPERM; |
| 229 | } |
| 230 | |
| 231 | fc_fcp_pkt_hold(fsp); |
| 232 | return 0; |
| 233 | } |
| 234 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 235 | /** |
| 236 | * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its |
| 237 | * reference count |
| 238 | * @fsp: The FCP packet to be unlocked and decremented |
| 239 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 240 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) |
| 241 | { |
| 242 | spin_unlock_bh(&fsp->scsi_pkt_lock); |
| 243 | fc_fcp_pkt_release(fsp); |
| 244 | } |
| 245 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 246 | /** |
| 247 | * fc_fcp_timer_set() - Start a timer for a fcp_pkt |
| 248 | * @fsp: The FCP packet to start a timer for |
| 249 | * @delay: The timeout period for the timer |
| 250 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 251 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) |
| 252 | { |
| 253 | if (!(fsp->state & FC_SRB_COMPL)) |
| 254 | mod_timer(&fsp->timer, jiffies + delay); |
| 255 | } |
| 256 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 257 | /** |
| 258 | * fc_fcp_send_abort() - Send an abort for exchanges associated with a |
| 259 | * fcp_pkt |
| 260 | * @fsp: The FCP packet to abort exchanges on |
| 261 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 262 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) |
| 263 | { |
| 264 | if (!fsp->seq_ptr) |
| 265 | return -EINVAL; |
| 266 | |
| 267 | fsp->state |= FC_SRB_ABORT_PENDING; |
| 268 | return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); |
| 269 | } |
| 270 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 271 | /** |
| 272 | * fc_fcp_retry_cmd() - Retry a fcp_pkt |
| 273 | * @fsp: The FCP packet to be retried |
| 274 | * |
| 275 | * Sets the status code to be FC_ERROR and then calls |
| 276 | * fc_fcp_complete_locked() which in turn calls fc_io_compl(). |
| 277 | * fc_io_compl() will notify the SCSI-ml that the I/O is done. |
| 278 | * The SCSI-ml will retry the command. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 279 | */ |
| 280 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) |
| 281 | { |
| 282 | if (fsp->seq_ptr) { |
| 283 | fsp->lp->tt.exch_done(fsp->seq_ptr); |
| 284 | fsp->seq_ptr = NULL; |
| 285 | } |
| 286 | |
| 287 | fsp->state &= ~FC_SRB_ABORT_PENDING; |
Martin K. Petersen | 1c9fbaf | 2009-01-04 03:14:11 -0500 | [diff] [blame] | 288 | fsp->io_status = 0; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 289 | fsp->status_code = FC_ERROR; |
| 290 | fc_fcp_complete_locked(fsp); |
| 291 | } |
| 292 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 293 | /** |
| 294 | * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context |
| 295 | * @fsp: The FCP packet that will manage the DDP frames |
| 296 | * @xid: The XID that will be used for the DDP exchange |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 297 | */ |
| 298 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) |
| 299 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 300 | struct fc_lport *lport; |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 301 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 302 | lport = fsp->lp; |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 303 | if ((fsp->req_flags & FC_SRB_READ) && |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 304 | (lport->lro_enabled) && (lport->tt.ddp_setup)) { |
| 305 | if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), |
| 306 | scsi_sg_count(fsp->cmd))) |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 307 | fsp->xfer_ddp = xid; |
| 308 | } |
| 309 | } |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 310 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 311 | /** |
| 312 | * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any |
| 313 | * DDP related resources for a fcp_pkt |
| 314 | * @fsp: The FCP packet that DDP had been used on |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 315 | */ |
| 316 | static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) |
| 317 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 318 | struct fc_lport *lport; |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 319 | |
| 320 | if (!fsp) |
| 321 | return; |
| 322 | |
Yi Zou | 5e472d0 | 2009-10-21 16:26:50 -0700 | [diff] [blame] | 323 | if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
| 324 | return; |
| 325 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 326 | lport = fsp->lp; |
| 327 | if (lport->tt.ddp_done) { |
| 328 | fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); |
Yi Zou | 5e472d0 | 2009-10-21 16:26:50 -0700 | [diff] [blame] | 329 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 330 | } |
| 331 | } |
| 332 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 333 | /** |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 334 | * fc_fcp_can_queue_ramp_up() - increases can_queue |
| 335 | * @lport: lport to ramp up can_queue |
| 336 | * |
| 337 | * Locking notes: Called with Scsi_Host lock held |
| 338 | */ |
| 339 | static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) |
| 340 | { |
| 341 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
| 342 | int can_queue; |
| 343 | |
| 344 | if (si->last_can_queue_ramp_up_time && |
| 345 | (time_before(jiffies, si->last_can_queue_ramp_up_time + |
| 346 | FC_CAN_QUEUE_PERIOD))) |
| 347 | return; |
| 348 | |
| 349 | if (time_before(jiffies, si->last_can_queue_ramp_down_time + |
| 350 | FC_CAN_QUEUE_PERIOD)) |
| 351 | return; |
| 352 | |
| 353 | si->last_can_queue_ramp_up_time = jiffies; |
| 354 | |
| 355 | can_queue = lport->host->can_queue << 1; |
| 356 | if (can_queue >= si->max_can_queue) { |
| 357 | can_queue = si->max_can_queue; |
| 358 | si->last_can_queue_ramp_down_time = 0; |
| 359 | } |
| 360 | lport->host->can_queue = can_queue; |
| 361 | shost_printk(KERN_ERR, lport->host, "libfc: increased " |
| 362 | "can_queue to %d.\n", can_queue); |
| 363 | } |
| 364 | |
| 365 | /** |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 366 | * fc_fcp_can_queue_ramp_down() - reduces can_queue |
| 367 | * @lport: lport to reduce can_queue |
| 368 | * |
| 369 | * If we are getting memory allocation failures, then we may |
| 370 | * be trying to execute too many commands. We let the running |
| 371 | * commands complete or timeout, then try again with a reduced |
| 372 | * can_queue. Eventually we will hit the point where we run |
| 373 | * on all reserved structs. |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 374 | * |
| 375 | * Locking notes: Called with Scsi_Host lock held |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 376 | */ |
| 377 | static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) |
| 378 | { |
| 379 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 380 | int can_queue; |
| 381 | |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 382 | if (si->last_can_queue_ramp_down_time && |
| 383 | (time_before(jiffies, si->last_can_queue_ramp_down_time + |
| 384 | FC_CAN_QUEUE_PERIOD))) |
| 385 | return; |
| 386 | |
| 387 | si->last_can_queue_ramp_down_time = jiffies; |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 388 | |
| 389 | can_queue = lport->host->can_queue; |
| 390 | can_queue >>= 1; |
| 391 | if (!can_queue) |
| 392 | can_queue = 1; |
| 393 | lport->host->can_queue = can_queue; |
| 394 | shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" |
| 395 | "Reducing can_queue to %d.\n", can_queue); |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | /* |
| 399 | * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. |
| 400 | * @lport: fc lport struct |
| 401 | * @len: payload length |
| 402 | * |
| 403 | * Allocates fc_frame structure and buffer but if fails to allocate |
| 404 | * then reduce can_queue. |
| 405 | */ |
| 406 | static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, |
| 407 | size_t len) |
| 408 | { |
| 409 | struct fc_frame *fp; |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 410 | unsigned long flags; |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 411 | |
| 412 | fp = fc_frame_alloc(lport, len); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 413 | if (likely(fp)) |
| 414 | return fp; |
| 415 | |
| 416 | /* error case */ |
| 417 | spin_lock_irqsave(lport->host->host_lock, flags); |
| 418 | fc_fcp_can_queue_ramp_down(lport); |
| 419 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
| 420 | return NULL; |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 424 | * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target |
| 425 | * @fsp: The FCP packet the data is on |
| 426 | * @fp: The data frame |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 427 | */ |
| 428 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
| 429 | { |
| 430 | struct scsi_cmnd *sc = fsp->cmd; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 431 | struct fc_lport *lport = fsp->lp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 432 | struct fcoe_dev_stats *stats; |
| 433 | struct fc_frame_header *fh; |
| 434 | size_t start_offset; |
| 435 | size_t offset; |
| 436 | u32 crc; |
| 437 | u32 copy_len = 0; |
| 438 | size_t len; |
| 439 | void *buf; |
| 440 | struct scatterlist *sg; |
Robert Love | 5868287 | 2009-11-03 11:47:28 -0800 | [diff] [blame] | 441 | u32 nents; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 442 | |
| 443 | fh = fc_frame_header_get(fp); |
| 444 | offset = ntohl(fh->fh_parm_offset); |
| 445 | start_offset = offset; |
| 446 | len = fr_len(fp) - sizeof(*fh); |
| 447 | buf = fc_frame_payload_get(fp, 0); |
| 448 | |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 449 | /* |
| 450 | * if this I/O is ddped then clear it |
| 451 | * and initiate recovery since data |
| 452 | * frames are expected to be placed |
| 453 | * directly in that case. |
| 454 | */ |
| 455 | if (fsp->xfer_ddp != FC_XID_UNKNOWN) { |
| 456 | fc_fcp_ddp_done(fsp); |
| 457 | goto err; |
| 458 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 459 | if (offset + len > fsp->data_len) { |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 460 | /* this should never happen */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 461 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
| 462 | fc_frame_crc_check(fp)) |
| 463 | goto crc_err; |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 464 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
| 465 | "data_len %x\n", len, offset, fsp->data_len); |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 466 | goto err; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 467 | } |
| 468 | if (offset != fsp->xfer_len) |
| 469 | fsp->state |= FC_SRB_DISCONTIG; |
| 470 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 471 | sg = scsi_sglist(sc); |
Robert Love | 5868287 | 2009-11-03 11:47:28 -0800 | [diff] [blame] | 472 | nents = scsi_sg_count(sc); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 473 | |
Robert Love | 5868287 | 2009-11-03 11:47:28 -0800 | [diff] [blame] | 474 | if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
| 475 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, |
| 476 | &offset, KM_SOFTIRQ0, NULL); |
| 477 | } else { |
| 478 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); |
| 479 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, |
| 480 | &offset, KM_SOFTIRQ0, &crc); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 481 | buf = fc_frame_payload_get(fp, 0); |
Robert Love | 5868287 | 2009-11-03 11:47:28 -0800 | [diff] [blame] | 482 | if (len % 4) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 483 | crc = crc32(crc, buf + len, 4 - (len % 4)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 484 | |
| 485 | if (~crc != le32_to_cpu(fr_crc(fp))) { |
| 486 | crc_err: |
Joe Eykholt | f018b73 | 2010-03-12 16:08:55 -0800 | [diff] [blame] | 487 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 488 | stats->ErrorFrames++; |
Joe Eykholt | f018b73 | 2010-03-12 16:08:55 -0800 | [diff] [blame] | 489 | /* per cpu count, not total count, but OK for limit */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 490 | if (stats->InvalidCRCCount++ < 5) |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 491 | printk(KERN_WARNING "libfc: CRC error on data " |
Chris Leech | ce8b5df | 2010-04-09 14:23:10 -0700 | [diff] [blame] | 492 | "frame for port (%6.6x)\n", |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 493 | lport->port_id); |
Joe Eykholt | f018b73 | 2010-03-12 16:08:55 -0800 | [diff] [blame] | 494 | put_cpu(); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 495 | /* |
| 496 | * Assume the frame is total garbage. |
| 497 | * We may have copied it over the good part |
| 498 | * of the buffer. |
| 499 | * If so, we need to retry the entire operation. |
| 500 | * Otherwise, ignore it. |
| 501 | */ |
| 502 | if (fsp->state & FC_SRB_DISCONTIG) |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 503 | goto err; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 504 | return; |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | if (fsp->xfer_contig_end == start_offset) |
| 509 | fsp->xfer_contig_end += copy_len; |
| 510 | fsp->xfer_len += copy_len; |
| 511 | |
| 512 | /* |
| 513 | * In the very rare event that this data arrived after the response |
| 514 | * and completes the transfer, call the completion handler. |
| 515 | */ |
| 516 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && |
| 517 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) |
| 518 | fc_fcp_complete_locked(fsp); |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 519 | return; |
| 520 | err: |
| 521 | fc_fcp_recovery(fsp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 522 | } |
| 523 | |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 524 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 525 | * fc_fcp_send_data() - Send SCSI data to a target |
| 526 | * @fsp: The FCP packet the data is on |
| 527 | * @sp: The sequence the data is to be sent on |
| 528 | * @offset: The starting offset for this data request |
| 529 | * @seq_blen: The burst length for this data request |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 530 | * |
| 531 | * Called after receiving a Transfer Ready data descriptor. |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 532 | * If the LLD is capable of sequence offload then send down the |
Uwe Kleine-König | 9ddc5b6 | 2010-01-20 17:02:24 +0100 | [diff] [blame] | 533 | * seq_blen amount of data in single frame, otherwise send |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 534 | * multiple frames of the maximum frame payload supported by |
| 535 | * the target port. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 536 | */ |
| 537 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, |
| 538 | size_t offset, size_t seq_blen) |
| 539 | { |
| 540 | struct fc_exch *ep; |
| 541 | struct scsi_cmnd *sc; |
| 542 | struct scatterlist *sg; |
| 543 | struct fc_frame *fp = NULL; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 544 | struct fc_lport *lport = fsp->lp; |
Chris Leech | 18fa11e | 2009-11-03 11:50:05 -0800 | [diff] [blame] | 545 | struct page *page; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 546 | size_t remaining; |
| 547 | size_t t_blen; |
| 548 | size_t tlen; |
| 549 | size_t sg_bytes; |
| 550 | size_t frame_offset, fh_parm_offset; |
Chris Leech | 18fa11e | 2009-11-03 11:50:05 -0800 | [diff] [blame] | 551 | size_t off; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 552 | int error; |
| 553 | void *data = NULL; |
| 554 | void *page_addr; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 555 | int using_sg = lport->sg_supp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 556 | u32 f_ctl; |
| 557 | |
| 558 | WARN_ON(seq_blen <= 0); |
| 559 | if (unlikely(offset + seq_blen > fsp->data_len)) { |
| 560 | /* this should never happen */ |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 561 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
| 562 | "offset %zx\n", seq_blen, offset); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 563 | fc_fcp_send_abort(fsp); |
| 564 | return 0; |
| 565 | } else if (offset != fsp->xfer_len) { |
| 566 | /* Out of Order Data Request - no problem, but unexpected. */ |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 567 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
| 568 | "seq_blen %zx offset %zx\n", seq_blen, offset); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 569 | } |
| 570 | |
| 571 | /* |
| 572 | * if LLD is capable of seq_offload then set transport |
| 573 | * burst length (t_blen) to seq_blen, otherwise set t_blen |
| 574 | * to max FC frame payload previously set in fsp->max_payload. |
| 575 | */ |
Yi Zou | 276d681 | 2009-02-27 14:07:10 -0800 | [diff] [blame] | 576 | t_blen = fsp->max_payload; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 577 | if (lport->seq_offload) { |
| 578 | t_blen = min(seq_blen, (size_t)lport->lso_max); |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 579 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 580 | fsp, seq_blen, lport->lso_max, t_blen); |
Yi Zou | 276d681 | 2009-02-27 14:07:10 -0800 | [diff] [blame] | 581 | } |
| 582 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 583 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); |
| 584 | if (t_blen > 512) |
| 585 | t_blen &= ~(512 - 1); /* round down to block size */ |
| 586 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */ |
| 587 | sc = fsp->cmd; |
| 588 | |
| 589 | remaining = seq_blen; |
| 590 | fh_parm_offset = frame_offset = offset; |
| 591 | tlen = 0; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 592 | seq = lport->tt.seq_start_next(seq); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 593 | f_ctl = FC_FC_REL_OFF; |
| 594 | WARN_ON(!seq); |
| 595 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 596 | sg = scsi_sglist(sc); |
| 597 | |
| 598 | while (remaining > 0 && sg) { |
| 599 | if (offset >= sg->length) { |
| 600 | offset -= sg->length; |
| 601 | sg = sg_next(sg); |
| 602 | continue; |
| 603 | } |
| 604 | if (!fp) { |
| 605 | tlen = min(t_blen, remaining); |
| 606 | |
| 607 | /* |
| 608 | * TODO. Temporary workaround. fc_seq_send() can't |
| 609 | * handle odd lengths in non-linear skbs. |
| 610 | * This will be the final fragment only. |
| 611 | */ |
| 612 | if (tlen % 4) |
| 613 | using_sg = 0; |
Vasu Dev | a7bbc7f | 2009-11-03 11:47:55 -0800 | [diff] [blame] | 614 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
| 615 | if (!fp) |
| 616 | return -ENOMEM; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 617 | |
Vasu Dev | a7bbc7f | 2009-11-03 11:47:55 -0800 | [diff] [blame] | 618 | data = fc_frame_header_get(fp) + 1; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 619 | fh_parm_offset = frame_offset; |
| 620 | fr_max_payload(fp) = fsp->max_payload; |
| 621 | } |
Chris Leech | 18fa11e | 2009-11-03 11:50:05 -0800 | [diff] [blame] | 622 | |
| 623 | off = offset + sg->offset; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 624 | sg_bytes = min(tlen, sg->length - offset); |
Chris Leech | 18fa11e | 2009-11-03 11:50:05 -0800 | [diff] [blame] | 625 | sg_bytes = min(sg_bytes, |
| 626 | (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); |
| 627 | page = sg_page(sg) + (off >> PAGE_SHIFT); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 628 | if (using_sg) { |
Chris Leech | 18fa11e | 2009-11-03 11:50:05 -0800 | [diff] [blame] | 629 | get_page(page); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 630 | skb_fill_page_desc(fp_skb(fp), |
| 631 | skb_shinfo(fp_skb(fp))->nr_frags, |
Chris Leech | 18fa11e | 2009-11-03 11:50:05 -0800 | [diff] [blame] | 632 | page, off & ~PAGE_MASK, sg_bytes); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 633 | fp_skb(fp)->data_len += sg_bytes; |
| 634 | fr_len(fp) += sg_bytes; |
| 635 | fp_skb(fp)->truesize += PAGE_SIZE; |
| 636 | } else { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 637 | /* |
| 638 | * The scatterlist item may be bigger than PAGE_SIZE, |
| 639 | * but we must not cross pages inside the kmap. |
| 640 | */ |
Chris Leech | 18fa11e | 2009-11-03 11:50:05 -0800 | [diff] [blame] | 641 | page_addr = kmap_atomic(page, KM_SOFTIRQ0); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 642 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
| 643 | sg_bytes); |
| 644 | kunmap_atomic(page_addr, KM_SOFTIRQ0); |
| 645 | data += sg_bytes; |
| 646 | } |
| 647 | offset += sg_bytes; |
| 648 | frame_offset += sg_bytes; |
| 649 | tlen -= sg_bytes; |
| 650 | remaining -= sg_bytes; |
| 651 | |
Yi Zou | d37322a | 2009-10-21 16:27:58 -0700 | [diff] [blame] | 652 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
| 653 | (tlen)) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 654 | continue; |
| 655 | |
| 656 | /* |
| 657 | * Send sequence with transfer sequence initiative in case |
| 658 | * this is last FCP frame of the sequence. |
| 659 | */ |
| 660 | if (remaining == 0) |
| 661 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; |
| 662 | |
| 663 | ep = fc_seq_exch(seq); |
| 664 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, |
| 665 | FC_TYPE_FCP, f_ctl, fh_parm_offset); |
| 666 | |
| 667 | /* |
| 668 | * send fragment using for a sequence. |
| 669 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 670 | error = lport->tt.seq_send(lport, seq, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 671 | if (error) { |
| 672 | WARN_ON(1); /* send error should be rare */ |
| 673 | fc_fcp_retry_cmd(fsp); |
| 674 | return 0; |
| 675 | } |
| 676 | fp = NULL; |
| 677 | } |
| 678 | fsp->xfer_len += seq_blen; /* premature count? */ |
| 679 | return 0; |
| 680 | } |
| 681 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 682 | /** |
| 683 | * fc_fcp_abts_resp() - Send an ABTS response |
| 684 | * @fsp: The FCP packet that is being aborted |
| 685 | * @fp: The response frame |
| 686 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 687 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
| 688 | { |
| 689 | int ba_done = 1; |
| 690 | struct fc_ba_rjt *brp; |
| 691 | struct fc_frame_header *fh; |
| 692 | |
| 693 | fh = fc_frame_header_get(fp); |
| 694 | switch (fh->fh_r_ctl) { |
| 695 | case FC_RCTL_BA_ACC: |
| 696 | break; |
| 697 | case FC_RCTL_BA_RJT: |
| 698 | brp = fc_frame_payload_get(fp, sizeof(*brp)); |
| 699 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) |
| 700 | break; |
| 701 | /* fall thru */ |
| 702 | default: |
| 703 | /* |
| 704 | * we will let the command timeout |
| 705 | * and scsi-ml recover in this case, |
| 706 | * therefore cleared the ba_done flag. |
| 707 | */ |
| 708 | ba_done = 0; |
| 709 | } |
| 710 | |
| 711 | if (ba_done) { |
| 712 | fsp->state |= FC_SRB_ABORTED; |
| 713 | fsp->state &= ~FC_SRB_ABORT_PENDING; |
| 714 | |
| 715 | if (fsp->wait_for_comp) |
| 716 | complete(&fsp->tm_done); |
| 717 | else |
| 718 | fc_fcp_complete_locked(fsp); |
| 719 | } |
| 720 | } |
| 721 | |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 722 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 723 | * fc_fcp_recv() - Reveive an FCP frame |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 724 | * @seq: The sequence the frame is on |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 725 | * @fp: The received frame |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 726 | * @arg: The related FCP packet |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 727 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 728 | * Context: Called from Soft IRQ context. Can not be called |
| 729 | * holding the FCP packet list lock. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 730 | */ |
| 731 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) |
| 732 | { |
| 733 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; |
Robert Love | a29e764 | 2009-04-21 16:27:41 -0700 | [diff] [blame] | 734 | struct fc_lport *lport = fsp->lp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 735 | struct fc_frame_header *fh; |
| 736 | struct fcp_txrdy *dd; |
| 737 | u8 r_ctl; |
| 738 | int rc = 0; |
| 739 | |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 740 | if (IS_ERR(fp)) { |
| 741 | fc_fcp_error(fsp, fp); |
| 742 | return; |
| 743 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 744 | |
| 745 | fh = fc_frame_header_get(fp); |
| 746 | r_ctl = fh->fh_r_ctl; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 747 | |
Robert Love | a29e764 | 2009-04-21 16:27:41 -0700 | [diff] [blame] | 748 | if (!(lport->state & LPORT_ST_READY)) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 749 | goto out; |
| 750 | if (fc_fcp_lock_pkt(fsp)) |
| 751 | goto out; |
| 752 | fsp->last_pkt_time = jiffies; |
| 753 | |
| 754 | if (fh->fh_type == FC_TYPE_BLS) { |
| 755 | fc_fcp_abts_resp(fsp, fp); |
| 756 | goto unlock; |
| 757 | } |
| 758 | |
| 759 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) |
| 760 | goto unlock; |
| 761 | |
| 762 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { |
| 763 | /* |
| 764 | * received XFER RDY from the target |
| 765 | * need to send data to the target |
| 766 | */ |
| 767 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); |
| 768 | dd = fc_frame_payload_get(fp, sizeof(*dd)); |
| 769 | WARN_ON(!dd); |
| 770 | |
| 771 | rc = fc_fcp_send_data(fsp, seq, |
| 772 | (size_t) ntohl(dd->ft_data_ro), |
| 773 | (size_t) ntohl(dd->ft_burst_len)); |
| 774 | if (!rc) |
| 775 | seq->rec_data = fsp->xfer_len; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 776 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { |
| 777 | /* |
| 778 | * received a DATA frame |
| 779 | * next we will copy the data to the system buffer |
| 780 | */ |
| 781 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ |
| 782 | fc_fcp_recv_data(fsp, fp); |
| 783 | seq->rec_data = fsp->xfer_contig_end; |
| 784 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { |
| 785 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); |
| 786 | |
| 787 | fc_fcp_resp(fsp, fp); |
| 788 | } else { |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 789 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 790 | } |
| 791 | unlock: |
| 792 | fc_fcp_unlock_pkt(fsp); |
| 793 | out: |
| 794 | fc_frame_free(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 795 | } |
| 796 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 797 | /** |
| 798 | * fc_fcp_resp() - Handler for FCP responses |
| 799 | * @fsp: The FCP packet the response is for |
| 800 | * @fp: The response frame |
| 801 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 802 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
| 803 | { |
| 804 | struct fc_frame_header *fh; |
| 805 | struct fcp_resp *fc_rp; |
| 806 | struct fcp_resp_ext *rp_ex; |
| 807 | struct fcp_resp_rsp_info *fc_rp_info; |
| 808 | u32 plen; |
| 809 | u32 expected_len; |
| 810 | u32 respl = 0; |
| 811 | u32 snsl = 0; |
| 812 | u8 flags = 0; |
| 813 | |
| 814 | plen = fr_len(fp); |
| 815 | fh = (struct fc_frame_header *)fr_hdr(fp); |
| 816 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) |
| 817 | goto len_err; |
| 818 | plen -= sizeof(*fh); |
| 819 | fc_rp = (struct fcp_resp *)(fh + 1); |
| 820 | fsp->cdb_status = fc_rp->fr_status; |
| 821 | flags = fc_rp->fr_flags; |
| 822 | fsp->scsi_comp_flags = flags; |
| 823 | expected_len = fsp->data_len; |
| 824 | |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 825 | /* if ddp, update xfer len */ |
| 826 | fc_fcp_ddp_done(fsp); |
| 827 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 828 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
| 829 | rp_ex = (void *)(fc_rp + 1); |
| 830 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { |
| 831 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) |
| 832 | goto len_err; |
| 833 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); |
| 834 | if (flags & FCP_RSP_LEN_VAL) { |
| 835 | respl = ntohl(rp_ex->fr_rsp_len); |
| 836 | if (respl != sizeof(*fc_rp_info)) |
| 837 | goto len_err; |
| 838 | if (fsp->wait_for_comp) { |
| 839 | /* Abuse cdb_status for rsp code */ |
| 840 | fsp->cdb_status = fc_rp_info->rsp_code; |
| 841 | complete(&fsp->tm_done); |
| 842 | /* |
| 843 | * tmfs will not have any scsi cmd so |
| 844 | * exit here |
| 845 | */ |
| 846 | return; |
Yi Zou | 63ac4bb | 2010-04-09 14:23:05 -0700 | [diff] [blame] | 847 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 848 | } |
| 849 | if (flags & FCP_SNS_LEN_VAL) { |
| 850 | snsl = ntohl(rp_ex->fr_sns_len); |
| 851 | if (snsl > SCSI_SENSE_BUFFERSIZE) |
| 852 | snsl = SCSI_SENSE_BUFFERSIZE; |
| 853 | memcpy(fsp->cmd->sense_buffer, |
| 854 | (char *)fc_rp_info + respl, snsl); |
| 855 | } |
| 856 | } |
| 857 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { |
| 858 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) |
| 859 | goto len_err; |
| 860 | if (flags & FCP_RESID_UNDER) { |
| 861 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); |
| 862 | /* |
| 863 | * The cmnd->underflow is the minimum number of |
| 864 | * bytes that must be transfered for this |
| 865 | * command. Provided a sense condition is not |
| 866 | * present, make sure the actual amount |
| 867 | * transferred is at least the underflow value |
| 868 | * or fail. |
| 869 | */ |
| 870 | if (!(flags & FCP_SNS_LEN_VAL) && |
| 871 | (fc_rp->fr_status == 0) && |
| 872 | (scsi_bufflen(fsp->cmd) - |
| 873 | fsp->scsi_resid) < fsp->cmd->underflow) |
| 874 | goto err; |
| 875 | expected_len -= fsp->scsi_resid; |
| 876 | } else { |
| 877 | fsp->status_code = FC_ERROR; |
| 878 | } |
| 879 | } |
| 880 | } |
| 881 | fsp->state |= FC_SRB_RCV_STATUS; |
| 882 | |
| 883 | /* |
| 884 | * Check for missing or extra data frames. |
| 885 | */ |
| 886 | if (unlikely(fsp->xfer_len != expected_len)) { |
| 887 | if (fsp->xfer_len < expected_len) { |
| 888 | /* |
| 889 | * Some data may be queued locally, |
| 890 | * Wait a at least one jiffy to see if it is delivered. |
| 891 | * If this expires without data, we may do SRR. |
| 892 | */ |
| 893 | fc_fcp_timer_set(fsp, 2); |
| 894 | return; |
| 895 | } |
| 896 | fsp->status_code = FC_DATA_OVRRUN; |
Chris Leech | ce8b5df | 2010-04-09 14:23:10 -0700 | [diff] [blame] | 897 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 898 | "len %x, data len %x\n", |
| 899 | fsp->rport->port_id, |
| 900 | fsp->xfer_len, expected_len, fsp->data_len); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 901 | } |
| 902 | fc_fcp_complete_locked(fsp); |
| 903 | return; |
| 904 | |
| 905 | len_err: |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 906 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
| 907 | "snsl %u\n", flags, fr_len(fp), respl, snsl); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 908 | err: |
| 909 | fsp->status_code = FC_ERROR; |
| 910 | fc_fcp_complete_locked(fsp); |
| 911 | } |
| 912 | |
| 913 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 914 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
| 915 | * fcp_pkt lock held |
| 916 | * @fsp: The FCP packet to be completed |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 917 | * |
| 918 | * This function may sleep if a timer is pending. The packet lock must be |
| 919 | * held, and the host lock must not be held. |
| 920 | */ |
| 921 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) |
| 922 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 923 | struct fc_lport *lport = fsp->lp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 924 | struct fc_seq *seq; |
| 925 | struct fc_exch *ep; |
| 926 | u32 f_ctl; |
| 927 | |
| 928 | if (fsp->state & FC_SRB_ABORT_PENDING) |
| 929 | return; |
| 930 | |
| 931 | if (fsp->state & FC_SRB_ABORTED) { |
| 932 | if (!fsp->status_code) |
| 933 | fsp->status_code = FC_CMD_ABORTED; |
| 934 | } else { |
| 935 | /* |
| 936 | * Test for transport underrun, independent of response |
| 937 | * underrun status. |
| 938 | */ |
| 939 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && |
| 940 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || |
| 941 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { |
| 942 | fsp->status_code = FC_DATA_UNDRUN; |
Martin K. Petersen | 1c9fbaf | 2009-01-04 03:14:11 -0500 | [diff] [blame] | 943 | fsp->io_status = 0; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 944 | } |
| 945 | } |
| 946 | |
| 947 | seq = fsp->seq_ptr; |
| 948 | if (seq) { |
| 949 | fsp->seq_ptr = NULL; |
| 950 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { |
| 951 | struct fc_frame *conf_frame; |
| 952 | struct fc_seq *csp; |
| 953 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 954 | csp = lport->tt.seq_start_next(seq); |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 955 | conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 956 | if (conf_frame) { |
| 957 | f_ctl = FC_FC_SEQ_INIT; |
| 958 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; |
| 959 | ep = fc_seq_exch(seq); |
| 960 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, |
| 961 | ep->did, ep->sid, |
| 962 | FC_TYPE_FCP, f_ctl, 0); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 963 | lport->tt.seq_send(lport, csp, conf_frame); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 964 | } |
| 965 | } |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 966 | lport->tt.exch_done(seq); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 967 | } |
| 968 | fc_io_compl(fsp); |
| 969 | } |
| 970 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 971 | /** |
| 972 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt |
| 973 | * @fsp: The FCP packet whose exchanges should be canceled |
| 974 | * @error: The reason for the cancellation |
| 975 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 976 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
| 977 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 978 | struct fc_lport *lport = fsp->lp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 979 | |
| 980 | if (fsp->seq_ptr) { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 981 | lport->tt.exch_done(fsp->seq_ptr); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 982 | fsp->seq_ptr = NULL; |
| 983 | } |
| 984 | fsp->status_code = error; |
| 985 | } |
| 986 | |
| 987 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 988 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
| 989 | * @lport: The local port whose exchanges should be canceled |
| 990 | * @id: The target's ID |
| 991 | * @lun: The LUN |
| 992 | * @error: The reason for cancellation |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 993 | * |
| 994 | * If lun or id is -1, they are ignored. |
| 995 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 996 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 997 | unsigned int lun, int error) |
| 998 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 999 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1000 | struct fc_fcp_pkt *fsp; |
| 1001 | struct scsi_cmnd *sc_cmd; |
| 1002 | unsigned long flags; |
| 1003 | |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1004 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1005 | restart: |
| 1006 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { |
| 1007 | sc_cmd = fsp->cmd; |
| 1008 | if (id != -1 && scmd_id(sc_cmd) != id) |
| 1009 | continue; |
| 1010 | |
| 1011 | if (lun != -1 && sc_cmd->device->lun != lun) |
| 1012 | continue; |
| 1013 | |
| 1014 | fc_fcp_pkt_hold(fsp); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1015 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1016 | |
| 1017 | if (!fc_fcp_lock_pkt(fsp)) { |
| 1018 | fc_fcp_cleanup_cmd(fsp, error); |
| 1019 | fc_io_compl(fsp); |
| 1020 | fc_fcp_unlock_pkt(fsp); |
| 1021 | } |
| 1022 | |
| 1023 | fc_fcp_pkt_release(fsp); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1024 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1025 | /* |
| 1026 | * while we dropped the lock multiple pkts could |
| 1027 | * have been released, so we have to start over. |
| 1028 | */ |
| 1029 | goto restart; |
| 1030 | } |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1031 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1032 | } |
| 1033 | |
| 1034 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1035 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port |
| 1036 | * @lport: The local port whose exchanges are to be aborted |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1037 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1038 | static void fc_fcp_abort_io(struct fc_lport *lport) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1039 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1040 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
| 1041 | } |
| 1042 | |
| 1043 | /** |
| 1044 | * fc_fcp_pkt_send() - Send a fcp_pkt |
| 1045 | * @lport: The local port to send the FCP packet on |
| 1046 | * @fsp: The FCP packet to send |
| 1047 | * |
| 1048 | * Return: Zero for success and -1 for failure |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1049 | * Locks: Called without locks held |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1050 | */ |
| 1051 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
| 1052 | { |
| 1053 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1054 | unsigned long flags; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1055 | int rc; |
| 1056 | |
| 1057 | fsp->cmd->SCp.ptr = (char *)fsp; |
| 1058 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); |
| 1059 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; |
| 1060 | |
| 1061 | int_to_scsilun(fsp->cmd->device->lun, |
| 1062 | (struct scsi_lun *)fsp->cdb_cmd.fc_lun); |
| 1063 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1064 | |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1065 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
| 1066 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); |
| 1067 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1068 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1069 | if (unlikely(rc)) { |
| 1070 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1071 | list_del(&fsp->list); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1072 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
| 1073 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1074 | |
| 1075 | return rc; |
| 1076 | } |
| 1077 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1078 | /** |
| 1079 | * fc_fcp_cmd_send() - Send a FCP command |
| 1080 | * @lport: The local port to send the command on |
| 1081 | * @fsp: The FCP packet the command is on |
| 1082 | * @resp: The handler for the response |
| 1083 | */ |
| 1084 | static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1085 | void (*resp)(struct fc_seq *, |
| 1086 | struct fc_frame *fp, |
| 1087 | void *arg)) |
| 1088 | { |
| 1089 | struct fc_frame *fp; |
| 1090 | struct fc_seq *seq; |
| 1091 | struct fc_rport *rport; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1092 | struct fc_rport_libfc_priv *rpriv; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1093 | const size_t len = sizeof(fsp->cdb_cmd); |
| 1094 | int rc = 0; |
| 1095 | |
| 1096 | if (fc_fcp_lock_pkt(fsp)) |
| 1097 | return 0; |
| 1098 | |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 1099 | fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1100 | if (!fp) { |
| 1101 | rc = -1; |
| 1102 | goto unlock; |
| 1103 | } |
| 1104 | |
| 1105 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 1106 | fr_fsp(fp) = fsp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1107 | rport = fsp->rport; |
| 1108 | fsp->max_payload = rport->maxframe_size; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1109 | rpriv = rport->dd_data; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1110 | |
| 1111 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 1112 | rpriv->local_port->port_id, FC_TYPE_FCP, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1113 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
| 1114 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1115 | seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, |
| 1116 | fsp, 0); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1117 | if (!seq) { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1118 | rc = -1; |
| 1119 | goto unlock; |
| 1120 | } |
| 1121 | fsp->last_pkt_time = jiffies; |
| 1122 | fsp->seq_ptr = seq; |
| 1123 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ |
| 1124 | |
| 1125 | setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); |
| 1126 | fc_fcp_timer_set(fsp, |
| 1127 | (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ? |
| 1128 | FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT); |
| 1129 | unlock: |
| 1130 | fc_fcp_unlock_pkt(fsp); |
| 1131 | return rc; |
| 1132 | } |
| 1133 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1134 | /** |
| 1135 | * fc_fcp_error() - Handler for FCP layer errors |
| 1136 | * @fsp: The FCP packet the error is on |
| 1137 | * @fp: The frame that has errored |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1138 | */ |
| 1139 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
| 1140 | { |
| 1141 | int error = PTR_ERR(fp); |
| 1142 | |
| 1143 | if (fc_fcp_lock_pkt(fsp)) |
| 1144 | return; |
| 1145 | |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 1146 | if (error == -FC_EX_CLOSED) { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1147 | fc_fcp_retry_cmd(fsp); |
| 1148 | goto unlock; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1149 | } |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 1150 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1151 | /* |
| 1152 | * clear abort pending, because the lower layer |
| 1153 | * decided to force completion. |
| 1154 | */ |
| 1155 | fsp->state &= ~FC_SRB_ABORT_PENDING; |
| 1156 | fsp->status_code = FC_CMD_PLOGO; |
| 1157 | fc_fcp_complete_locked(fsp); |
| 1158 | unlock: |
| 1159 | fc_fcp_unlock_pkt(fsp); |
| 1160 | } |
| 1161 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1162 | /** |
| 1163 | * fc_fcp_pkt_abort() - Abort a fcp_pkt |
| 1164 | * @fsp: The FCP packet to abort on |
| 1165 | * |
| 1166 | * Called to send an abort and then wait for abort completion |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1167 | */ |
Robert Love | c340111 | 2009-10-21 16:27:06 -0700 | [diff] [blame] | 1168 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1169 | { |
| 1170 | int rc = FAILED; |
| 1171 | |
| 1172 | if (fc_fcp_send_abort(fsp)) |
| 1173 | return FAILED; |
| 1174 | |
| 1175 | init_completion(&fsp->tm_done); |
| 1176 | fsp->wait_for_comp = 1; |
| 1177 | |
| 1178 | spin_unlock_bh(&fsp->scsi_pkt_lock); |
| 1179 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); |
| 1180 | spin_lock_bh(&fsp->scsi_pkt_lock); |
| 1181 | fsp->wait_for_comp = 0; |
| 1182 | |
| 1183 | if (!rc) { |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 1184 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1185 | rc = FAILED; |
| 1186 | } else if (fsp->state & FC_SRB_ABORTED) { |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 1187 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1188 | rc = SUCCESS; |
| 1189 | fc_fcp_complete_locked(fsp); |
| 1190 | } |
| 1191 | |
| 1192 | return rc; |
| 1193 | } |
| 1194 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1195 | /** |
| 1196 | * fc_lun_reset_send() - Send LUN reset command |
| 1197 | * @data: The FCP packet that identifies the LUN to be reset |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1198 | */ |
| 1199 | static void fc_lun_reset_send(unsigned long data) |
| 1200 | { |
| 1201 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1202 | struct fc_lport *lport = fsp->lp; |
| 1203 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1204 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
| 1205 | return; |
| 1206 | if (fc_fcp_lock_pkt(fsp)) |
| 1207 | return; |
| 1208 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); |
| 1209 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); |
| 1210 | fc_fcp_unlock_pkt(fsp); |
| 1211 | } |
| 1212 | } |
| 1213 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1214 | /** |
| 1215 | * fc_lun_reset() - Send a LUN RESET command to a device |
| 1216 | * and wait for the reply |
| 1217 | * @lport: The local port to sent the comand on |
| 1218 | * @fsp: The FCP packet that identifies the LUN to be reset |
| 1219 | * @id: The SCSI command ID |
| 1220 | * @lun: The LUN ID to be reset |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1221 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1222 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1223 | unsigned int id, unsigned int lun) |
| 1224 | { |
| 1225 | int rc; |
| 1226 | |
| 1227 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); |
| 1228 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; |
| 1229 | int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); |
| 1230 | |
| 1231 | fsp->wait_for_comp = 1; |
| 1232 | init_completion(&fsp->tm_done); |
| 1233 | |
| 1234 | fc_lun_reset_send((unsigned long)fsp); |
| 1235 | |
| 1236 | /* |
| 1237 | * wait for completion of reset |
| 1238 | * after that make sure all commands are terminated |
| 1239 | */ |
| 1240 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); |
| 1241 | |
| 1242 | spin_lock_bh(&fsp->scsi_pkt_lock); |
| 1243 | fsp->state |= FC_SRB_COMPL; |
| 1244 | spin_unlock_bh(&fsp->scsi_pkt_lock); |
| 1245 | |
| 1246 | del_timer_sync(&fsp->timer); |
| 1247 | |
| 1248 | spin_lock_bh(&fsp->scsi_pkt_lock); |
| 1249 | if (fsp->seq_ptr) { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1250 | lport->tt.exch_done(fsp->seq_ptr); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1251 | fsp->seq_ptr = NULL; |
| 1252 | } |
| 1253 | fsp->wait_for_comp = 0; |
| 1254 | spin_unlock_bh(&fsp->scsi_pkt_lock); |
| 1255 | |
| 1256 | if (!rc) { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1257 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1258 | return FAILED; |
| 1259 | } |
| 1260 | |
| 1261 | /* cdb_status holds the tmf's rsp code */ |
| 1262 | if (fsp->cdb_status != FCP_TMF_CMPL) |
| 1263 | return FAILED; |
| 1264 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1265 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
| 1266 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1267 | return SUCCESS; |
| 1268 | } |
| 1269 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1270 | /** |
| 1271 | * fc_tm_done() - Task Managment response handler |
| 1272 | * @seq: The sequence that the response is on |
| 1273 | * @fp: The response frame |
| 1274 | * @arg: The FCP packet the response is for |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1275 | */ |
| 1276 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) |
| 1277 | { |
| 1278 | struct fc_fcp_pkt *fsp = arg; |
| 1279 | struct fc_frame_header *fh; |
| 1280 | |
| 1281 | if (IS_ERR(fp)) { |
| 1282 | /* |
| 1283 | * If there is an error just let it timeout or wait |
| 1284 | * for TMF to be aborted if it timedout. |
| 1285 | * |
| 1286 | * scsi-eh will escalate for when either happens. |
| 1287 | */ |
| 1288 | return; |
| 1289 | } |
| 1290 | |
| 1291 | if (fc_fcp_lock_pkt(fsp)) |
| 1292 | return; |
| 1293 | |
| 1294 | /* |
| 1295 | * raced with eh timeout handler. |
| 1296 | */ |
| 1297 | if (!fsp->seq_ptr || !fsp->wait_for_comp) { |
| 1298 | spin_unlock_bh(&fsp->scsi_pkt_lock); |
| 1299 | return; |
| 1300 | } |
| 1301 | |
| 1302 | fh = fc_frame_header_get(fp); |
| 1303 | if (fh->fh_type != FC_TYPE_BLS) |
| 1304 | fc_fcp_resp(fsp, fp); |
| 1305 | fsp->seq_ptr = NULL; |
| 1306 | fsp->lp->tt.exch_done(seq); |
| 1307 | fc_frame_free(fp); |
| 1308 | fc_fcp_unlock_pkt(fsp); |
| 1309 | } |
| 1310 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1311 | /** |
| 1312 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port |
| 1313 | * @lport: The local port to be cleaned up |
| 1314 | */ |
| 1315 | static void fc_fcp_cleanup(struct fc_lport *lport) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1316 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1317 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1318 | } |
| 1319 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1320 | /** |
| 1321 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts |
| 1322 | * @data: The FCP packet that has timed out |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1323 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1324 | * If REC is supported then just issue it and return. The REC exchange will |
| 1325 | * complete or time out and recovery can continue at that point. Otherwise, |
| 1326 | * if the response has been received without all the data it has been |
| 1327 | * ER_TIMEOUT since the response was received. If the response has not been |
| 1328 | * received we see if data was received recently. If it has been then we |
| 1329 | * continue waiting, otherwise, we abort the command. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1330 | */ |
| 1331 | static void fc_fcp_timeout(unsigned long data) |
| 1332 | { |
| 1333 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; |
| 1334 | struct fc_rport *rport = fsp->rport; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1335 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1336 | |
| 1337 | if (fc_fcp_lock_pkt(fsp)) |
| 1338 | return; |
| 1339 | |
| 1340 | if (fsp->cdb_cmd.fc_tm_flags) |
| 1341 | goto unlock; |
| 1342 | |
| 1343 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; |
| 1344 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1345 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1346 | fc_fcp_rec(fsp); |
| 1347 | else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), |
| 1348 | jiffies)) |
| 1349 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); |
| 1350 | else if (fsp->state & FC_SRB_RCV_STATUS) |
| 1351 | fc_fcp_complete_locked(fsp); |
| 1352 | else |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1353 | fc_fcp_recovery(fsp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1354 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
| 1355 | unlock: |
| 1356 | fc_fcp_unlock_pkt(fsp); |
| 1357 | } |
| 1358 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1359 | /** |
| 1360 | * fc_fcp_rec() - Send a REC ELS request |
| 1361 | * @fsp: The FCP packet to send the REC request on |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1362 | */ |
| 1363 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) |
| 1364 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1365 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1366 | struct fc_frame *fp; |
| 1367 | struct fc_rport *rport; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1368 | struct fc_rport_libfc_priv *rpriv; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1369 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1370 | lport = fsp->lp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1371 | rport = fsp->rport; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1372 | rpriv = rport->dd_data; |
| 1373 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1374 | fsp->status_code = FC_HRD_ERROR; |
Martin K. Petersen | 1c9fbaf | 2009-01-04 03:14:11 -0500 | [diff] [blame] | 1375 | fsp->io_status = 0; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1376 | fc_fcp_complete_locked(fsp); |
| 1377 | return; |
| 1378 | } |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 1379 | fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1380 | if (!fp) |
| 1381 | goto retry; |
| 1382 | |
| 1383 | fr_seq(fp) = fsp->seq_ptr; |
| 1384 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 1385 | rpriv->local_port->port_id, FC_TYPE_ELS, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1386 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1387 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
| 1388 | fc_fcp_rec_resp, fsp, |
| 1389 | jiffies_to_msecs(FC_SCSI_REC_TOV))) { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1390 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
| 1391 | return; |
| 1392 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1393 | retry: |
| 1394 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
| 1395 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); |
| 1396 | else |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1397 | fc_fcp_recovery(fsp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1398 | } |
| 1399 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1400 | /** |
| 1401 | * fc_fcp_rec_resp() - Handler for REC ELS responses |
| 1402 | * @seq: The sequence the response is on |
| 1403 | * @fp: The response frame |
| 1404 | * @arg: The FCP packet the response is on |
| 1405 | * |
| 1406 | * If the response is a reject then the scsi layer will handle |
| 1407 | * the timeout. If the response is a LS_ACC then if the I/O was not completed |
| 1408 | * set the timeout and return. If the I/O was completed then complete the |
| 1409 | * exchange and tell the SCSI layer. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1410 | */ |
| 1411 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) |
| 1412 | { |
| 1413 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; |
| 1414 | struct fc_els_rec_acc *recp; |
| 1415 | struct fc_els_ls_rjt *rjt; |
| 1416 | u32 e_stat; |
| 1417 | u8 opcode; |
| 1418 | u32 offset; |
| 1419 | enum dma_data_direction data_dir; |
| 1420 | enum fc_rctl r_ctl; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1421 | struct fc_rport_libfc_priv *rpriv; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1422 | |
| 1423 | if (IS_ERR(fp)) { |
| 1424 | fc_fcp_rec_error(fsp, fp); |
| 1425 | return; |
| 1426 | } |
| 1427 | |
| 1428 | if (fc_fcp_lock_pkt(fsp)) |
| 1429 | goto out; |
| 1430 | |
| 1431 | fsp->recov_retry = 0; |
| 1432 | opcode = fc_frame_payload_op(fp); |
| 1433 | if (opcode == ELS_LS_RJT) { |
| 1434 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); |
| 1435 | switch (rjt->er_reason) { |
| 1436 | default: |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 1437 | FC_FCP_DBG(fsp, "device %x unexpected REC reject " |
| 1438 | "reason %d expl %d\n", |
| 1439 | fsp->rport->port_id, rjt->er_reason, |
| 1440 | rjt->er_explan); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1441 | /* fall through */ |
| 1442 | case ELS_RJT_UNSUP: |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 1443 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1444 | rpriv = fsp->rport->dd_data; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1445 | /* |
| 1446 | * if we do not spport RECs or got some bogus |
| 1447 | * reason then resetup timer so we check for |
| 1448 | * making progress. |
| 1449 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1450 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1451 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); |
| 1452 | break; |
| 1453 | case ELS_RJT_LOGIC: |
| 1454 | case ELS_RJT_UNAB: |
| 1455 | /* |
| 1456 | * If no data transfer, the command frame got dropped |
| 1457 | * so we just retry. If data was transferred, we |
| 1458 | * lost the response but the target has no record, |
| 1459 | * so we abort and retry. |
| 1460 | */ |
| 1461 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && |
| 1462 | fsp->xfer_len == 0) { |
| 1463 | fc_fcp_retry_cmd(fsp); |
| 1464 | break; |
| 1465 | } |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1466 | fc_fcp_recovery(fsp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1467 | break; |
| 1468 | } |
| 1469 | } else if (opcode == ELS_LS_ACC) { |
| 1470 | if (fsp->state & FC_SRB_ABORTED) |
| 1471 | goto unlock_out; |
| 1472 | |
| 1473 | data_dir = fsp->cmd->sc_data_direction; |
| 1474 | recp = fc_frame_payload_get(fp, sizeof(*recp)); |
| 1475 | offset = ntohl(recp->reca_fc4value); |
| 1476 | e_stat = ntohl(recp->reca_e_stat); |
| 1477 | |
| 1478 | if (e_stat & ESB_ST_COMPLETE) { |
| 1479 | |
| 1480 | /* |
| 1481 | * The exchange is complete. |
| 1482 | * |
| 1483 | * For output, we must've lost the response. |
| 1484 | * For input, all data must've been sent. |
| 1485 | * We lost may have lost the response |
| 1486 | * (and a confirmation was requested) and maybe |
| 1487 | * some data. |
| 1488 | * |
| 1489 | * If all data received, send SRR |
| 1490 | * asking for response. If partial data received, |
| 1491 | * or gaps, SRR requests data at start of gap. |
| 1492 | * Recovery via SRR relies on in-order-delivery. |
| 1493 | */ |
| 1494 | if (data_dir == DMA_TO_DEVICE) { |
| 1495 | r_ctl = FC_RCTL_DD_CMD_STATUS; |
| 1496 | } else if (fsp->xfer_contig_end == offset) { |
| 1497 | r_ctl = FC_RCTL_DD_CMD_STATUS; |
| 1498 | } else { |
| 1499 | offset = fsp->xfer_contig_end; |
| 1500 | r_ctl = FC_RCTL_DD_SOL_DATA; |
| 1501 | } |
| 1502 | fc_fcp_srr(fsp, r_ctl, offset); |
| 1503 | } else if (e_stat & ESB_ST_SEQ_INIT) { |
| 1504 | |
| 1505 | /* |
| 1506 | * The remote port has the initiative, so just |
| 1507 | * keep waiting for it to complete. |
| 1508 | */ |
| 1509 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); |
| 1510 | } else { |
| 1511 | |
| 1512 | /* |
| 1513 | * The exchange is incomplete, we have seq. initiative. |
| 1514 | * Lost response with requested confirmation, |
| 1515 | * lost confirmation, lost transfer ready or |
| 1516 | * lost write data. |
| 1517 | * |
| 1518 | * For output, if not all data was received, ask |
| 1519 | * for transfer ready to be repeated. |
| 1520 | * |
| 1521 | * If we received or sent all the data, send SRR to |
| 1522 | * request response. |
| 1523 | * |
| 1524 | * If we lost a response, we may have lost some read |
| 1525 | * data as well. |
| 1526 | */ |
| 1527 | r_ctl = FC_RCTL_DD_SOL_DATA; |
| 1528 | if (data_dir == DMA_TO_DEVICE) { |
| 1529 | r_ctl = FC_RCTL_DD_CMD_STATUS; |
| 1530 | if (offset < fsp->data_len) |
| 1531 | r_ctl = FC_RCTL_DD_DATA_DESC; |
| 1532 | } else if (offset == fsp->xfer_contig_end) { |
| 1533 | r_ctl = FC_RCTL_DD_CMD_STATUS; |
| 1534 | } else if (fsp->xfer_contig_end < offset) { |
| 1535 | offset = fsp->xfer_contig_end; |
| 1536 | } |
| 1537 | fc_fcp_srr(fsp, r_ctl, offset); |
| 1538 | } |
| 1539 | } |
| 1540 | unlock_out: |
| 1541 | fc_fcp_unlock_pkt(fsp); |
| 1542 | out: |
| 1543 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ |
| 1544 | fc_frame_free(fp); |
| 1545 | } |
| 1546 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1547 | /** |
| 1548 | * fc_fcp_rec_error() - Handler for REC errors |
| 1549 | * @fsp: The FCP packet the error is on |
| 1550 | * @fp: The REC frame |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1551 | */ |
| 1552 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
| 1553 | { |
| 1554 | int error = PTR_ERR(fp); |
| 1555 | |
| 1556 | if (fc_fcp_lock_pkt(fsp)) |
| 1557 | goto out; |
| 1558 | |
| 1559 | switch (error) { |
| 1560 | case -FC_EX_CLOSED: |
| 1561 | fc_fcp_retry_cmd(fsp); |
| 1562 | break; |
| 1563 | |
| 1564 | default: |
Chris Leech | ce8b5df | 2010-04-09 14:23:10 -0700 | [diff] [blame] | 1565 | FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 1566 | fsp, fsp->rport->port_id, error); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1567 | fsp->status_code = FC_CMD_PLOGO; |
| 1568 | /* fall through */ |
| 1569 | |
| 1570 | case -FC_EX_TIMEOUT: |
| 1571 | /* |
| 1572 | * Assume REC or LS_ACC was lost. |
| 1573 | * The exchange manager will have aborted REC, so retry. |
| 1574 | */ |
Chris Leech | ce8b5df | 2010-04-09 14:23:10 -0700 | [diff] [blame] | 1575 | FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 1576 | fsp->rport->port_id, error, fsp->recov_retry, |
| 1577 | FC_MAX_RECOV_RETRY); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1578 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
| 1579 | fc_fcp_rec(fsp); |
| 1580 | else |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1581 | fc_fcp_recovery(fsp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1582 | break; |
| 1583 | } |
| 1584 | fc_fcp_unlock_pkt(fsp); |
| 1585 | out: |
| 1586 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ |
| 1587 | } |
| 1588 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1589 | /** |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1590 | * fc_fcp_recovery() - Handler for fcp_pkt recovery |
| 1591 | * @fsp: The FCP pkt that needs to be aborted |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1592 | */ |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1593 | static void fc_fcp_recovery(struct fc_fcp_pkt *fsp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1594 | { |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1595 | fsp->status_code = FC_CMD_RECOVERY; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1596 | fsp->cdb_status = 0; |
| 1597 | fsp->io_status = 0; |
| 1598 | /* |
| 1599 | * if this fails then we let the scsi command timer fire and |
| 1600 | * scsi-ml escalate. |
| 1601 | */ |
| 1602 | fc_fcp_send_abort(fsp); |
| 1603 | } |
| 1604 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1605 | /** |
| 1606 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) |
| 1607 | * @fsp: The FCP packet the SRR is to be sent on |
| 1608 | * @r_ctl: The R_CTL field for the SRR request |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1609 | * This is called after receiving status but insufficient data, or |
| 1610 | * when expecting status but the request has timed out. |
| 1611 | */ |
| 1612 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) |
| 1613 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1614 | struct fc_lport *lport = fsp->lp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1615 | struct fc_rport *rport; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1616 | struct fc_rport_libfc_priv *rpriv; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1617 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
| 1618 | struct fc_seq *seq; |
| 1619 | struct fcp_srr *srr; |
| 1620 | struct fc_frame *fp; |
| 1621 | u8 cdb_op; |
| 1622 | |
| 1623 | rport = fsp->rport; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1624 | rpriv = rport->dd_data; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1625 | cdb_op = fsp->cdb_cmd.fc_cdb[0]; |
| 1626 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1627 | if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
| 1628 | rpriv->rp_state != RPORT_ST_READY) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1629 | goto retry; /* shouldn't happen */ |
Vasu Dev | c46be11 | 2009-11-03 11:48:00 -0800 | [diff] [blame] | 1630 | fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1631 | if (!fp) |
| 1632 | goto retry; |
| 1633 | |
| 1634 | srr = fc_frame_payload_get(fp, sizeof(*srr)); |
| 1635 | memset(srr, 0, sizeof(*srr)); |
| 1636 | srr->srr_op = ELS_SRR; |
| 1637 | srr->srr_ox_id = htons(ep->oxid); |
| 1638 | srr->srr_rx_id = htons(ep->rxid); |
| 1639 | srr->srr_r_ctl = r_ctl; |
| 1640 | srr->srr_rel_off = htonl(offset); |
| 1641 | |
| 1642 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 1643 | rpriv->local_port->port_id, FC_TYPE_FCP, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1644 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
| 1645 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1646 | seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, |
| 1647 | fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); |
Chris Leech | 8f550f9 | 2009-10-21 16:28:09 -0700 | [diff] [blame] | 1648 | if (!seq) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1649 | goto retry; |
Chris Leech | 8f550f9 | 2009-10-21 16:28:09 -0700 | [diff] [blame] | 1650 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1651 | fsp->recov_seq = seq; |
| 1652 | fsp->xfer_len = offset; |
| 1653 | fsp->xfer_contig_end = offset; |
| 1654 | fsp->state &= ~FC_SRB_RCV_STATUS; |
| 1655 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ |
| 1656 | return; |
| 1657 | retry: |
| 1658 | fc_fcp_retry_cmd(fsp); |
| 1659 | } |
| 1660 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1661 | /** |
| 1662 | * fc_fcp_srr_resp() - Handler for SRR response |
| 1663 | * @seq: The sequence the SRR is on |
| 1664 | * @fp: The SRR frame |
| 1665 | * @arg: The FCP packet the SRR is on |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1666 | */ |
| 1667 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) |
| 1668 | { |
| 1669 | struct fc_fcp_pkt *fsp = arg; |
| 1670 | struct fc_frame_header *fh; |
| 1671 | |
| 1672 | if (IS_ERR(fp)) { |
| 1673 | fc_fcp_srr_error(fsp, fp); |
| 1674 | return; |
| 1675 | } |
| 1676 | |
| 1677 | if (fc_fcp_lock_pkt(fsp)) |
| 1678 | goto out; |
| 1679 | |
| 1680 | fh = fc_frame_header_get(fp); |
| 1681 | /* |
| 1682 | * BUG? fc_fcp_srr_error calls exch_done which would release |
| 1683 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, |
| 1684 | * then fc_exch_timeout would be sending an abort. The exch_done |
| 1685 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing |
| 1686 | * an abort response though. |
| 1687 | */ |
| 1688 | if (fh->fh_type == FC_TYPE_BLS) { |
| 1689 | fc_fcp_unlock_pkt(fsp); |
| 1690 | return; |
| 1691 | } |
| 1692 | |
| 1693 | fsp->recov_seq = NULL; |
| 1694 | switch (fc_frame_payload_op(fp)) { |
| 1695 | case ELS_LS_ACC: |
| 1696 | fsp->recov_retry = 0; |
| 1697 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); |
| 1698 | break; |
| 1699 | case ELS_LS_RJT: |
| 1700 | default: |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1701 | fc_fcp_recovery(fsp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1702 | break; |
| 1703 | } |
| 1704 | fc_fcp_unlock_pkt(fsp); |
| 1705 | fsp->lp->tt.exch_done(seq); |
| 1706 | out: |
| 1707 | fc_frame_free(fp); |
| 1708 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ |
| 1709 | } |
| 1710 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1711 | /** |
| 1712 | * fc_fcp_srr_error() - Handler for SRR errors |
| 1713 | * @fsp: The FCP packet that the SRR error is on |
| 1714 | * @fp: The SRR frame |
| 1715 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1716 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
| 1717 | { |
| 1718 | if (fc_fcp_lock_pkt(fsp)) |
| 1719 | goto out; |
| 1720 | fsp->lp->tt.exch_done(fsp->recov_seq); |
| 1721 | fsp->recov_seq = NULL; |
| 1722 | switch (PTR_ERR(fp)) { |
| 1723 | case -FC_EX_TIMEOUT: |
| 1724 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
| 1725 | fc_fcp_rec(fsp); |
| 1726 | else |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1727 | fc_fcp_recovery(fsp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1728 | break; |
| 1729 | case -FC_EX_CLOSED: /* e.g., link failure */ |
| 1730 | /* fall through */ |
| 1731 | default: |
| 1732 | fc_fcp_retry_cmd(fsp); |
| 1733 | break; |
| 1734 | } |
| 1735 | fc_fcp_unlock_pkt(fsp); |
| 1736 | out: |
| 1737 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ |
| 1738 | } |
| 1739 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1740 | /** |
| 1741 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready |
| 1742 | * @lport: The local port to be checked |
| 1743 | */ |
| 1744 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1745 | { |
| 1746 | /* lock ? */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1747 | return (lport->state == LPORT_ST_READY) && |
| 1748 | lport->link_up && !lport->qfull; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1749 | } |
| 1750 | |
| 1751 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1752 | * fc_queuecommand() - The queuecommand function of the SCSI template |
| 1753 | * @cmd: The scsi_cmnd to be executed |
| 1754 | * @done: The callback function to be called when the scsi_cmnd is complete |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1755 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1756 | * This is the i/o strategy routine, called by the SCSI layer. This routine |
| 1757 | * is called with the host_lock held. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1758 | */ |
| 1759 | int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) |
| 1760 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1761 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1762 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
| 1763 | struct fc_fcp_pkt *fsp; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1764 | struct fc_rport_libfc_priv *rpriv; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1765 | int rval; |
| 1766 | int rc = 0; |
| 1767 | struct fcoe_dev_stats *stats; |
| 1768 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1769 | lport = shost_priv(sc_cmd->device->host); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1770 | spin_unlock_irq(lport->host->host_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1771 | |
| 1772 | rval = fc_remote_port_chkready(rport); |
| 1773 | if (rval) { |
| 1774 | sc_cmd->result = rval; |
| 1775 | done(sc_cmd); |
| 1776 | goto out; |
| 1777 | } |
| 1778 | |
| 1779 | if (!*(struct fc_remote_port **)rport->dd_data) { |
| 1780 | /* |
| 1781 | * rport is transitioning from blocked/deleted to |
| 1782 | * online |
| 1783 | */ |
| 1784 | sc_cmd->result = DID_IMM_RETRY << 16; |
| 1785 | done(sc_cmd); |
| 1786 | goto out; |
| 1787 | } |
| 1788 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1789 | rpriv = rport->dd_data; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1790 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1791 | if (!fc_fcp_lport_queue_ready(lport)) { |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 1792 | if (lport->qfull) |
| 1793 | fc_fcp_can_queue_ramp_down(lport); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1794 | rc = SCSI_MLQUEUE_HOST_BUSY; |
| 1795 | goto out; |
| 1796 | } |
| 1797 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1798 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1799 | if (fsp == NULL) { |
| 1800 | rc = SCSI_MLQUEUE_HOST_BUSY; |
| 1801 | goto out; |
| 1802 | } |
| 1803 | |
| 1804 | /* |
| 1805 | * build the libfc request pkt |
| 1806 | */ |
| 1807 | fsp->cmd = sc_cmd; /* save the cmd */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1808 | fsp->lp = lport; /* save the softc ptr */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1809 | fsp->rport = rport; /* set the remote port ptr */ |
Yi Zou | 5e472d0 | 2009-10-21 16:26:50 -0700 | [diff] [blame] | 1810 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1811 | sc_cmd->scsi_done = done; |
| 1812 | |
| 1813 | /* |
| 1814 | * set up the transfer length |
| 1815 | */ |
| 1816 | fsp->data_len = scsi_bufflen(sc_cmd); |
| 1817 | fsp->xfer_len = 0; |
| 1818 | |
| 1819 | /* |
| 1820 | * setup the data direction |
| 1821 | */ |
Joe Eykholt | f018b73 | 2010-03-12 16:08:55 -0800 | [diff] [blame] | 1822 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1823 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
| 1824 | fsp->req_flags = FC_SRB_READ; |
| 1825 | stats->InputRequests++; |
| 1826 | stats->InputMegabytes = fsp->data_len; |
| 1827 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { |
| 1828 | fsp->req_flags = FC_SRB_WRITE; |
| 1829 | stats->OutputRequests++; |
| 1830 | stats->OutputMegabytes = fsp->data_len; |
| 1831 | } else { |
| 1832 | fsp->req_flags = 0; |
| 1833 | stats->ControlRequests++; |
| 1834 | } |
Joe Eykholt | f018b73 | 2010-03-12 16:08:55 -0800 | [diff] [blame] | 1835 | put_cpu(); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1836 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1837 | fsp->tgt_flags = rpriv->flags; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1838 | |
| 1839 | init_timer(&fsp->timer); |
| 1840 | fsp->timer.data = (unsigned long)fsp; |
| 1841 | |
| 1842 | /* |
| 1843 | * send it to the lower layer |
| 1844 | * if we get -1 return then put the request in the pending |
| 1845 | * queue. |
| 1846 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1847 | rval = fc_fcp_pkt_send(lport, fsp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1848 | if (rval != 0) { |
| 1849 | fsp->state = FC_SRB_FREE; |
| 1850 | fc_fcp_pkt_release(fsp); |
| 1851 | rc = SCSI_MLQUEUE_HOST_BUSY; |
| 1852 | } |
| 1853 | out: |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1854 | spin_lock_irq(lport->host->host_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1855 | return rc; |
| 1856 | } |
| 1857 | EXPORT_SYMBOL(fc_queuecommand); |
| 1858 | |
| 1859 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1860 | * fc_io_compl() - Handle responses for completed commands |
| 1861 | * @fsp: The FCP packet that is complete |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1862 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1863 | * Translates fcp_pkt errors to a Linux SCSI errors. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1864 | * The fcp packet lock must be held when calling. |
| 1865 | */ |
| 1866 | static void fc_io_compl(struct fc_fcp_pkt *fsp) |
| 1867 | { |
| 1868 | struct fc_fcp_internal *si; |
| 1869 | struct scsi_cmnd *sc_cmd; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1870 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1871 | unsigned long flags; |
| 1872 | |
Yi Zou | b277d2a | 2009-02-27 14:07:21 -0800 | [diff] [blame] | 1873 | /* release outstanding ddp context */ |
| 1874 | fc_fcp_ddp_done(fsp); |
| 1875 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1876 | fsp->state |= FC_SRB_COMPL; |
| 1877 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { |
| 1878 | spin_unlock_bh(&fsp->scsi_pkt_lock); |
| 1879 | del_timer_sync(&fsp->timer); |
| 1880 | spin_lock_bh(&fsp->scsi_pkt_lock); |
| 1881 | } |
| 1882 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1883 | lport = fsp->lp; |
| 1884 | si = fc_get_scsi_internal(lport); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1885 | if (!fsp->cmd) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1886 | return; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1887 | |
| 1888 | /* |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 1889 | * if can_queue ramp down is done then try can_queue ramp up |
| 1890 | * since commands are completing now. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1891 | */ |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 1892 | if (si->last_can_queue_ramp_down_time) |
| 1893 | fc_fcp_can_queue_ramp_up(lport); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1894 | |
| 1895 | sc_cmd = fsp->cmd; |
| 1896 | fsp->cmd = NULL; |
| 1897 | |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1898 | if (!sc_cmd->SCp.ptr) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1899 | return; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1900 | |
| 1901 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; |
| 1902 | switch (fsp->status_code) { |
| 1903 | case FC_COMPLETE: |
| 1904 | if (fsp->cdb_status == 0) { |
| 1905 | /* |
| 1906 | * good I/O status |
| 1907 | */ |
| 1908 | sc_cmd->result = DID_OK << 16; |
| 1909 | if (fsp->scsi_resid) |
| 1910 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1911 | } else { |
| 1912 | /* |
| 1913 | * transport level I/O was ok but scsi |
| 1914 | * has non zero status |
| 1915 | */ |
| 1916 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; |
| 1917 | } |
| 1918 | break; |
| 1919 | case FC_ERROR: |
Robert Love | b3ef990 | 2010-03-12 16:08:50 -0800 | [diff] [blame] | 1920 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| 1921 | "due to FC_ERROR\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1922 | sc_cmd->result = DID_ERROR << 16; |
| 1923 | break; |
| 1924 | case FC_DATA_UNDRUN: |
Vasu Dev | 26d9cab | 2009-02-27 10:55:07 -0800 | [diff] [blame] | 1925 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1926 | /* |
| 1927 | * scsi status is good but transport level |
Vasu Dev | 26d9cab | 2009-02-27 10:55:07 -0800 | [diff] [blame] | 1928 | * underrun. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1929 | */ |
Robert Love | b3ef990 | 2010-03-12 16:08:50 -0800 | [diff] [blame] | 1930 | if (fsp->state & FC_SRB_RCV_STATUS) { |
| 1931 | sc_cmd->result = DID_OK << 16; |
| 1932 | } else { |
| 1933 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" |
| 1934 | " due to FC_DATA_UNDRUN (trans)\n"); |
| 1935 | sc_cmd->result = DID_ERROR << 16; |
| 1936 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1937 | } else { |
| 1938 | /* |
| 1939 | * scsi got underrun, this is an error |
| 1940 | */ |
Robert Love | b3ef990 | 2010-03-12 16:08:50 -0800 | [diff] [blame] | 1941 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| 1942 | "due to FC_DATA_UNDRUN (scsi)\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1943 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; |
| 1944 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
| 1945 | } |
| 1946 | break; |
| 1947 | case FC_DATA_OVRRUN: |
| 1948 | /* |
| 1949 | * overrun is an error |
| 1950 | */ |
Robert Love | b3ef990 | 2010-03-12 16:08:50 -0800 | [diff] [blame] | 1951 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| 1952 | "due to FC_DATA_OVRRUN\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1953 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
| 1954 | break; |
| 1955 | case FC_CMD_ABORTED: |
Robert Love | b3ef990 | 2010-03-12 16:08:50 -0800 | [diff] [blame] | 1956 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| 1957 | "due to FC_CMD_ABORTED\n"); |
Mike Christie | d5e6054 | 2009-05-06 10:52:23 -0700 | [diff] [blame] | 1958 | sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1959 | break; |
Vasu Dev | 5c12c41 | 2010-03-12 16:08:44 -0800 | [diff] [blame] | 1960 | case FC_CMD_RECOVERY: |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1961 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; |
| 1962 | break; |
| 1963 | case FC_CMD_RESET: |
| 1964 | sc_cmd->result = (DID_RESET << 16); |
| 1965 | break; |
| 1966 | case FC_HRD_ERROR: |
| 1967 | sc_cmd->result = (DID_NO_CONNECT << 16); |
| 1968 | break; |
| 1969 | default: |
Robert Love | b3ef990 | 2010-03-12 16:08:50 -0800 | [diff] [blame] | 1970 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
| 1971 | "due to unknown error\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1972 | sc_cmd->result = (DID_ERROR << 16); |
| 1973 | break; |
| 1974 | } |
| 1975 | |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1976 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1977 | list_del(&fsp->list); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 1978 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1979 | sc_cmd->SCp.ptr = NULL; |
| 1980 | sc_cmd->scsi_done(sc_cmd); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1981 | |
| 1982 | /* release ref from initial allocation in queue command */ |
| 1983 | fc_fcp_pkt_release(fsp); |
| 1984 | } |
| 1985 | |
| 1986 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1987 | * fc_eh_abort() - Abort a command |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1988 | * @sc_cmd: The SCSI command to abort |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1989 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1990 | * From SCSI host template. |
| 1991 | * Send an ABTS to the target device and wait for the response. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1992 | */ |
| 1993 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) |
| 1994 | { |
| 1995 | struct fc_fcp_pkt *fsp; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1996 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1997 | int rc = FAILED; |
| 1998 | unsigned long flags; |
| 1999 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2000 | lport = shost_priv(sc_cmd->device->host); |
| 2001 | if (lport->state != LPORT_ST_READY) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2002 | return rc; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2003 | else if (!lport->link_up) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2004 | return rc; |
| 2005 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2006 | spin_lock_irqsave(lport->host->host_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2007 | fsp = CMD_SP(sc_cmd); |
| 2008 | if (!fsp) { |
| 2009 | /* command completed while scsi eh was setting up */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2010 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2011 | return SUCCESS; |
| 2012 | } |
| 2013 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ |
| 2014 | fc_fcp_pkt_hold(fsp); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2015 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2016 | |
| 2017 | if (fc_fcp_lock_pkt(fsp)) { |
| 2018 | /* completed while we were waiting for timer to be deleted */ |
| 2019 | rc = SUCCESS; |
| 2020 | goto release_pkt; |
| 2021 | } |
| 2022 | |
Robert Love | c340111 | 2009-10-21 16:27:06 -0700 | [diff] [blame] | 2023 | rc = fc_fcp_pkt_abort(fsp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2024 | fc_fcp_unlock_pkt(fsp); |
| 2025 | |
| 2026 | release_pkt: |
| 2027 | fc_fcp_pkt_release(fsp); |
| 2028 | return rc; |
| 2029 | } |
| 2030 | EXPORT_SYMBOL(fc_eh_abort); |
| 2031 | |
| 2032 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2033 | * fc_eh_device_reset() - Reset a single LUN |
| 2034 | * @sc_cmd: The SCSI command which identifies the device whose |
| 2035 | * LUN is to be reset |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2036 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2037 | * Set from SCSI host template. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2038 | */ |
| 2039 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) |
| 2040 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2041 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2042 | struct fc_fcp_pkt *fsp; |
| 2043 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
| 2044 | int rc = FAILED; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2045 | int rval; |
| 2046 | |
| 2047 | rval = fc_remote_port_chkready(rport); |
| 2048 | if (rval) |
| 2049 | goto out; |
| 2050 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2051 | lport = shost_priv(sc_cmd->device->host); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2052 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2053 | if (lport->state != LPORT_ST_READY) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2054 | return rc; |
| 2055 | |
Chris Leech | ce8b5df | 2010-04-09 14:23:10 -0700 | [diff] [blame] | 2056 | FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 2057 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2058 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2059 | if (fsp == NULL) { |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 2060 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2061 | goto out; |
| 2062 | } |
| 2063 | |
| 2064 | /* |
| 2065 | * Build the libfc request pkt. Do not set the scsi cmnd, because |
| 2066 | * the sc passed in is not setup for execution like when sent |
| 2067 | * through the queuecommand callout. |
| 2068 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2069 | fsp->lp = lport; /* save the softc ptr */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2070 | fsp->rport = rport; /* set the remote port ptr */ |
| 2071 | |
| 2072 | /* |
| 2073 | * flush outstanding commands |
| 2074 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2075 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2076 | fsp->state = FC_SRB_FREE; |
| 2077 | fc_fcp_pkt_release(fsp); |
| 2078 | |
| 2079 | out: |
| 2080 | return rc; |
| 2081 | } |
| 2082 | EXPORT_SYMBOL(fc_eh_device_reset); |
| 2083 | |
| 2084 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2085 | * fc_eh_host_reset() - Reset a Scsi_Host. |
| 2086 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2087 | */ |
| 2088 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) |
| 2089 | { |
| 2090 | struct Scsi_Host *shost = sc_cmd->device->host; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2091 | struct fc_lport *lport = shost_priv(shost); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2092 | unsigned long wait_tmo; |
| 2093 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2094 | FC_SCSI_DBG(lport, "Resetting host\n"); |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 2095 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2096 | lport->tt.lport_reset(lport); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2097 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2098 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
| 2099 | wait_tmo)) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2100 | msleep(1000); |
| 2101 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2102 | if (fc_fcp_lport_queue_ready(lport)) { |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 2103 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 2104 | "on port (%6.6x)\n", lport->port_id); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2105 | return SUCCESS; |
| 2106 | } else { |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 2107 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
Chris Leech | ce8b5df | 2010-04-09 14:23:10 -0700 | [diff] [blame] | 2108 | "port (%6.6x) is not ready.\n", |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 2109 | lport->port_id); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2110 | return FAILED; |
| 2111 | } |
| 2112 | } |
| 2113 | EXPORT_SYMBOL(fc_eh_host_reset); |
| 2114 | |
| 2115 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2116 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
| 2117 | * @sdev: The SCSI device that identifies the SCSI host |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2118 | * |
| 2119 | * Configures queue depth based on host's cmd_per_len. If not set |
| 2120 | * then we use the libfc default. |
| 2121 | */ |
| 2122 | int fc_slave_alloc(struct scsi_device *sdev) |
| 2123 | { |
| 2124 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2125 | |
| 2126 | if (!rport || fc_remote_port_chkready(rport)) |
| 2127 | return -ENXIO; |
| 2128 | |
Vasu Dev | 14caf44 | 2009-10-15 17:46:55 -0700 | [diff] [blame] | 2129 | if (sdev->tagged_supported) |
| 2130 | scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); |
| 2131 | else |
| 2132 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), |
| 2133 | FC_FCP_DFLT_QUEUE_DEPTH); |
| 2134 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2135 | return 0; |
| 2136 | } |
| 2137 | EXPORT_SYMBOL(fc_slave_alloc); |
| 2138 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2139 | /** |
| 2140 | * fc_change_queue_depth() - Change a device's queue depth |
| 2141 | * @sdev: The SCSI device whose queue depth is to change |
| 2142 | * @qdepth: The new queue depth |
| 2143 | * @reason: The resason for the change |
| 2144 | */ |
Mike Christie | e881a17 | 2009-10-15 17:46:39 -0700 | [diff] [blame] | 2145 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2146 | { |
Mike Christie | 5c20848 | 2009-10-15 17:46:50 -0700 | [diff] [blame] | 2147 | switch (reason) { |
| 2148 | case SCSI_QDEPTH_DEFAULT: |
| 2149 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); |
| 2150 | break; |
| 2151 | case SCSI_QDEPTH_QFULL: |
| 2152 | scsi_track_queue_full(sdev, qdepth); |
| 2153 | break; |
Vasu Dev | 229b8d7 | 2009-10-15 17:47:06 -0700 | [diff] [blame] | 2154 | case SCSI_QDEPTH_RAMP_UP: |
| 2155 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); |
| 2156 | break; |
Mike Christie | 5c20848 | 2009-10-15 17:46:50 -0700 | [diff] [blame] | 2157 | default: |
Mike Christie | e881a17 | 2009-10-15 17:46:39 -0700 | [diff] [blame] | 2158 | return -EOPNOTSUPP; |
Mike Christie | 5c20848 | 2009-10-15 17:46:50 -0700 | [diff] [blame] | 2159 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2160 | return sdev->queue_depth; |
| 2161 | } |
| 2162 | EXPORT_SYMBOL(fc_change_queue_depth); |
| 2163 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2164 | /** |
| 2165 | * fc_change_queue_type() - Change a device's queue type |
| 2166 | * @sdev: The SCSI device whose queue depth is to change |
| 2167 | * @tag_type: Identifier for queue type |
| 2168 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2169 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) |
| 2170 | { |
| 2171 | if (sdev->tagged_supported) { |
| 2172 | scsi_set_tag_type(sdev, tag_type); |
| 2173 | if (tag_type) |
| 2174 | scsi_activate_tcq(sdev, sdev->queue_depth); |
| 2175 | else |
| 2176 | scsi_deactivate_tcq(sdev, sdev->queue_depth); |
| 2177 | } else |
| 2178 | tag_type = 0; |
| 2179 | |
| 2180 | return tag_type; |
| 2181 | } |
| 2182 | EXPORT_SYMBOL(fc_change_queue_type); |
| 2183 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2184 | /** |
| 2185 | * fc_fcp_destory() - Tear down the FCP layer for a given local port |
| 2186 | * @lport: The local port that no longer needs the FCP layer |
| 2187 | */ |
| 2188 | void fc_fcp_destroy(struct fc_lport *lport) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2189 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2190 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2191 | |
| 2192 | if (!list_empty(&si->scsi_pkt_queue)) |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 2193 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 2194 | "port (%6.6x)\n", lport->port_id); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2195 | |
| 2196 | mempool_destroy(si->scsi_pkt_pool); |
| 2197 | kfree(si); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2198 | lport->scsi_priv = NULL; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2199 | } |
| 2200 | EXPORT_SYMBOL(fc_fcp_destroy); |
| 2201 | |
Robert Love | 93e6d5a | 2009-11-03 11:46:03 -0800 | [diff] [blame] | 2202 | int fc_setup_fcp() |
| 2203 | { |
| 2204 | int rc = 0; |
| 2205 | |
| 2206 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", |
| 2207 | sizeof(struct fc_fcp_pkt), |
| 2208 | 0, SLAB_HWCACHE_ALIGN, NULL); |
| 2209 | if (!scsi_pkt_cachep) { |
| 2210 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " |
| 2211 | "module load failed!"); |
| 2212 | rc = -ENOMEM; |
| 2213 | } |
| 2214 | |
| 2215 | return rc; |
| 2216 | } |
| 2217 | |
| 2218 | void fc_destroy_fcp() |
| 2219 | { |
| 2220 | if (scsi_pkt_cachep) |
| 2221 | kmem_cache_destroy(scsi_pkt_cachep); |
| 2222 | } |
| 2223 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2224 | /** |
| 2225 | * fc_fcp_init() - Initialize the FCP layer for a local port |
| 2226 | * @lport: The local port to initialize the exchange layer for |
| 2227 | */ |
| 2228 | int fc_fcp_init(struct fc_lport *lport) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2229 | { |
| 2230 | int rc; |
| 2231 | struct fc_fcp_internal *si; |
| 2232 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2233 | if (!lport->tt.fcp_cmd_send) |
| 2234 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2235 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2236 | if (!lport->tt.fcp_cleanup) |
| 2237 | lport->tt.fcp_cleanup = fc_fcp_cleanup; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2238 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2239 | if (!lport->tt.fcp_abort_io) |
| 2240 | lport->tt.fcp_abort_io = fc_fcp_abort_io; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2241 | |
| 2242 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); |
| 2243 | if (!si) |
| 2244 | return -ENOMEM; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2245 | lport->scsi_priv = si; |
Vasu Dev | 84c3e1a | 2009-11-03 11:48:06 -0800 | [diff] [blame] | 2246 | si->max_can_queue = lport->host->can_queue; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2247 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
Chris Leech | c1ecb90 | 2009-12-10 09:59:26 -0800 | [diff] [blame] | 2248 | spin_lock_init(&si->scsi_queue_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2249 | |
| 2250 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); |
| 2251 | if (!si->scsi_pkt_pool) { |
| 2252 | rc = -ENOMEM; |
| 2253 | goto free_internal; |
| 2254 | } |
| 2255 | return 0; |
| 2256 | |
| 2257 | free_internal: |
| 2258 | kfree(si); |
| 2259 | return rc; |
| 2260 | } |
| 2261 | EXPORT_SYMBOL(fc_fcp_init); |