1 /*
2 * This file is part of the Chelsio FCoE driver for Linux.
3 *
4 * Copyright (c) 2008-2012 Chelsio Communications, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include <linux/device.h>
36 #include <linux/delay.h>
37 #include <linux/ctype.h>
38 #include <linux/kernel.h>
39 #include <linux/slab.h>
40 #include <linux/string.h>
41 #include <linux/compiler.h>
42 #include <linux/export.h>
43 #include <linux/module.h>
44 #include <asm/unaligned.h>
45 #include <asm/page.h>
46 #include <scsi/scsi.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_transport_fc.h>
49
50 #include "csio_hw.h"
51 #include "csio_lnode.h"
52 #include "csio_rnode.h"
53 #include "csio_scsi.h"
54 #include "csio_init.h"
55
56 int csio_scsi_eqsize = 65536;
57 int csio_scsi_iqlen = 128;
58 int csio_scsi_ioreqs = 2048;
59 uint32_t csio_max_scan_tmo;
60 uint32_t csio_delta_scan_tmo = 5;
61 int csio_lun_qdepth = 32;
62
63 static int csio_ddp_descs = 128;
64
65 static int csio_do_abrt_cls(struct csio_hw *,
66 struct csio_ioreq *, bool);
67
68 static void csio_scsis_uninit(struct csio_ioreq *, enum csio_scsi_ev);
69 static void csio_scsis_io_active(struct csio_ioreq *, enum csio_scsi_ev);
70 static void csio_scsis_tm_active(struct csio_ioreq *, enum csio_scsi_ev);
71 static void csio_scsis_aborting(struct csio_ioreq *, enum csio_scsi_ev);
72 static void csio_scsis_closing(struct csio_ioreq *, enum csio_scsi_ev);
73 static void csio_scsis_shost_cmpl_await(struct csio_ioreq *, enum csio_scsi_ev);
74
75 /*
76 * csio_scsi_match_io - Match an ioreq with the given SCSI level data.
77 * @ioreq: The I/O request
78 * @sld: Level information
79 *
80 * Should be called with lock held.
81 *
82 */
83 static bool
csio_scsi_match_io(struct csio_ioreq * ioreq,struct csio_scsi_level_data * sld)84 csio_scsi_match_io(struct csio_ioreq *ioreq, struct csio_scsi_level_data *sld)
85 {
86 struct scsi_cmnd *scmnd = csio_scsi_cmnd(ioreq);
87
88 switch (sld->level) {
89 case CSIO_LEV_LUN:
90 if (scmnd == NULL)
91 return false;
92
93 return ((ioreq->lnode == sld->lnode) &&
94 (ioreq->rnode == sld->rnode) &&
95 ((uint64_t)scmnd->device->lun == sld->oslun));
96
97 case CSIO_LEV_RNODE:
98 return ((ioreq->lnode == sld->lnode) &&
99 (ioreq->rnode == sld->rnode));
100 case CSIO_LEV_LNODE:
101 return (ioreq->lnode == sld->lnode);
102 case CSIO_LEV_ALL:
103 return true;
104 default:
105 return false;
106 }
107 }
108
109 /*
110 * csio_scsi_gather_active_ios - Gather active I/Os based on level
111 * @scm: SCSI module
112 * @sld: Level information
113 * @dest: The queue where these I/Os have to be gathered.
114 *
115 * Should be called with lock held.
116 */
117 static void
csio_scsi_gather_active_ios(struct csio_scsim * scm,struct csio_scsi_level_data * sld,struct list_head * dest)118 csio_scsi_gather_active_ios(struct csio_scsim *scm,
119 struct csio_scsi_level_data *sld,
120 struct list_head *dest)
121 {
122 struct list_head *tmp, *next;
123
124 if (list_empty(&scm->active_q))
125 return;
126
127 /* Just splice the entire active_q into dest */
128 if (sld->level == CSIO_LEV_ALL) {
129 list_splice_tail_init(&scm->active_q, dest);
130 return;
131 }
132
133 list_for_each_safe(tmp, next, &scm->active_q) {
134 if (csio_scsi_match_io((struct csio_ioreq *)tmp, sld)) {
135 list_del_init(tmp);
136 list_add_tail(tmp, dest);
137 }
138 }
139 }
140
141 static inline bool
csio_scsi_itnexus_loss_error(uint16_t error)142 csio_scsi_itnexus_loss_error(uint16_t error)
143 {
144 switch (error) {
145 case FW_ERR_LINK_DOWN:
146 case FW_RDEV_NOT_READY:
147 case FW_ERR_RDEV_LOST:
148 case FW_ERR_RDEV_LOGO:
149 case FW_ERR_RDEV_IMPL_LOGO:
150 return true;
151 }
152 return false;
153 }
154
155 /*
156 * csio_scsi_fcp_cmnd - Frame the SCSI FCP command paylod.
157 * @req: IO req structure.
158 * @addr: DMA location to place the payload.
159 *
160 * This routine is shared between FCP_WRITE, FCP_READ and FCP_CMD requests.
161 */
162 static inline void
csio_scsi_fcp_cmnd(struct csio_ioreq * req,void * addr)163 csio_scsi_fcp_cmnd(struct csio_ioreq *req, void *addr)
164 {
165 struct fcp_cmnd *fcp_cmnd = (struct fcp_cmnd *)addr;
166 struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
167
168 /* Check for Task Management */
169 if (likely(csio_priv(scmnd)->fc_tm_flags == 0)) {
170 int_to_scsilun(scmnd->device->lun, &fcp_cmnd->fc_lun);
171 fcp_cmnd->fc_tm_flags = 0;
172 fcp_cmnd->fc_cmdref = 0;
173
174 memcpy(fcp_cmnd->fc_cdb, scmnd->cmnd, 16);
175 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
176 fcp_cmnd->fc_dl = cpu_to_be32(scsi_bufflen(scmnd));
177
178 if (req->nsge)
179 if (req->datadir == DMA_TO_DEVICE)
180 fcp_cmnd->fc_flags = FCP_CFL_WRDATA;
181 else
182 fcp_cmnd->fc_flags = FCP_CFL_RDDATA;
183 else
184 fcp_cmnd->fc_flags = 0;
185 } else {
186 memset(fcp_cmnd, 0, sizeof(*fcp_cmnd));
187 int_to_scsilun(scmnd->device->lun, &fcp_cmnd->fc_lun);
188 fcp_cmnd->fc_tm_flags = csio_priv(scmnd)->fc_tm_flags;
189 }
190 }
191
192 /*
193 * csio_scsi_init_cmd_wr - Initialize the SCSI CMD WR.
194 * @req: IO req structure.
195 * @addr: DMA location to place the payload.
196 * @size: Size of WR (including FW WR + immed data + rsp SG entry
197 *
198 * Wrapper for populating fw_scsi_cmd_wr.
199 */
200 static inline void
csio_scsi_init_cmd_wr(struct csio_ioreq * req,void * addr,uint32_t size)201 csio_scsi_init_cmd_wr(struct csio_ioreq *req, void *addr, uint32_t size)
202 {
203 struct csio_hw *hw = req->lnode->hwp;
204 struct csio_rnode *rn = req->rnode;
205 struct fw_scsi_cmd_wr *wr = (struct fw_scsi_cmd_wr *)addr;
206 struct csio_dma_buf *dma_buf;
207 uint8_t imm = csio_hw_to_scsim(hw)->proto_cmd_len;
208
209 wr->op_immdlen = cpu_to_be32(FW_WR_OP_V(FW_SCSI_CMD_WR) |
210 FW_SCSI_CMD_WR_IMMDLEN(imm));
211 wr->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(rn->flowid) |
212 FW_WR_LEN16_V(
213 DIV_ROUND_UP(size, 16)));
214
215 wr->cookie = (uintptr_t) req;
216 wr->iqid = cpu_to_be16(csio_q_physiqid(hw, req->iq_idx));
217 wr->tmo_val = (uint8_t) req->tmo;
218 wr->r3 = 0;
219 memset(&wr->r5, 0, 8);
220
221 /* Get RSP DMA buffer */
222 dma_buf = &req->dma_buf;
223
224 /* Prepare RSP SGL */
225 wr->rsp_dmalen = cpu_to_be32(dma_buf->len);
226 wr->rsp_dmaaddr = cpu_to_be64(dma_buf->paddr);
227
228 wr->r6 = 0;
229
230 wr->u.fcoe.ctl_pri = 0;
231 wr->u.fcoe.cp_en_class = 0;
232 wr->u.fcoe.r4_lo[0] = 0;
233 wr->u.fcoe.r4_lo[1] = 0;
234
235 /* Frame a FCP command */
236 csio_scsi_fcp_cmnd(req, (void *)((uintptr_t)addr +
237 sizeof(struct fw_scsi_cmd_wr)));
238 }
239
240 #define CSIO_SCSI_CMD_WR_SZ(_imm) \
241 (sizeof(struct fw_scsi_cmd_wr) + /* WR size */ \
242 ALIGN((_imm), 16)) /* Immed data */
243
244 #define CSIO_SCSI_CMD_WR_SZ_16(_imm) \
245 (ALIGN(CSIO_SCSI_CMD_WR_SZ((_imm)), 16))
246
247 /*
248 * csio_scsi_cmd - Create a SCSI CMD WR.
249 * @req: IO req structure.
250 *
251 * Gets a WR slot in the ingress queue and initializes it with SCSI CMD WR.
252 *
253 */
254 static inline void
csio_scsi_cmd(struct csio_ioreq * req)255 csio_scsi_cmd(struct csio_ioreq *req)
256 {
257 struct csio_wr_pair wrp;
258 struct csio_hw *hw = req->lnode->hwp;
259 struct csio_scsim *scsim = csio_hw_to_scsim(hw);
260 uint32_t size = CSIO_SCSI_CMD_WR_SZ_16(scsim->proto_cmd_len);
261
262 req->drv_status = csio_wr_get(hw, req->eq_idx, size, &wrp);
263 if (unlikely(req->drv_status != 0))
264 return;
265
266 if (wrp.size1 >= size) {
267 /* Initialize WR in one shot */
268 csio_scsi_init_cmd_wr(req, wrp.addr1, size);
269 } else {
270 uint8_t *tmpwr = csio_q_eq_wrap(hw, req->eq_idx);
271
272 /*
273 * Make a temporary copy of the WR and write back
274 * the copy into the WR pair.
275 */
276 csio_scsi_init_cmd_wr(req, (void *)tmpwr, size);
277 memcpy(wrp.addr1, tmpwr, wrp.size1);
278 memcpy(wrp.addr2, tmpwr + wrp.size1, size - wrp.size1);
279 }
280 }
281
282 /*
283 * csio_scsi_init_ulptx_dsgl - Fill in a ULP_TX_SC_DSGL
284 * @hw: HW module
285 * @req: IO request
286 * @sgl: ULP TX SGL pointer.
287 *
288 */
289 static inline void
csio_scsi_init_ultptx_dsgl(struct csio_hw * hw,struct csio_ioreq * req,struct ulptx_sgl * sgl)290 csio_scsi_init_ultptx_dsgl(struct csio_hw *hw, struct csio_ioreq *req,
291 struct ulptx_sgl *sgl)
292 {
293 struct ulptx_sge_pair *sge_pair = NULL;
294 struct scatterlist *sgel;
295 uint32_t i = 0;
296 uint32_t xfer_len;
297 struct list_head *tmp;
298 struct csio_dma_buf *dma_buf;
299 struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
300
301 sgl->cmd_nsge = htonl(ULPTX_CMD_V(ULP_TX_SC_DSGL) | ULPTX_MORE_F |
302 ULPTX_NSGE_V(req->nsge));
303 /* Now add the data SGLs */
304 if (likely(!req->dcopy)) {
305 scsi_for_each_sg(scmnd, sgel, req->nsge, i) {
306 if (i == 0) {
307 sgl->addr0 = cpu_to_be64(sg_dma_address(sgel));
308 sgl->len0 = cpu_to_be32(sg_dma_len(sgel));
309 sge_pair = (struct ulptx_sge_pair *)(sgl + 1);
310 continue;
311 }
312 if ((i - 1) & 0x1) {
313 sge_pair->addr[1] = cpu_to_be64(
314 sg_dma_address(sgel));
315 sge_pair->len[1] = cpu_to_be32(
316 sg_dma_len(sgel));
317 sge_pair++;
318 } else {
319 sge_pair->addr[0] = cpu_to_be64(
320 sg_dma_address(sgel));
321 sge_pair->len[0] = cpu_to_be32(
322 sg_dma_len(sgel));
323 }
324 }
325 } else {
326 /* Program sg elements with driver's DDP buffer */
327 xfer_len = scsi_bufflen(scmnd);
328 list_for_each(tmp, &req->gen_list) {
329 dma_buf = (struct csio_dma_buf *)tmp;
330 if (i == 0) {
331 sgl->addr0 = cpu_to_be64(dma_buf->paddr);
332 sgl->len0 = cpu_to_be32(
333 min(xfer_len, dma_buf->len));
334 sge_pair = (struct ulptx_sge_pair *)(sgl + 1);
335 } else if ((i - 1) & 0x1) {
336 sge_pair->addr[1] = cpu_to_be64(dma_buf->paddr);
337 sge_pair->len[1] = cpu_to_be32(
338 min(xfer_len, dma_buf->len));
339 sge_pair++;
340 } else {
341 sge_pair->addr[0] = cpu_to_be64(dma_buf->paddr);
342 sge_pair->len[0] = cpu_to_be32(
343 min(xfer_len, dma_buf->len));
344 }
345 xfer_len -= min(xfer_len, dma_buf->len);
346 i++;
347 }
348 }
349 }
350
351 /*
352 * csio_scsi_init_read_wr - Initialize the READ SCSI WR.
353 * @req: IO req structure.
354 * @wrp: DMA location to place the payload.
355 * @size: Size of WR (including FW WR + immed data + rsp SG entry + data SGL
356 *
357 * Wrapper for populating fw_scsi_read_wr.
358 */
359 static inline void
csio_scsi_init_read_wr(struct csio_ioreq * req,void * wrp,uint32_t size)360 csio_scsi_init_read_wr(struct csio_ioreq *req, void *wrp, uint32_t size)
361 {
362 struct csio_hw *hw = req->lnode->hwp;
363 struct csio_rnode *rn = req->rnode;
364 struct fw_scsi_read_wr *wr = (struct fw_scsi_read_wr *)wrp;
365 struct ulptx_sgl *sgl;
366 struct csio_dma_buf *dma_buf;
367 uint8_t imm = csio_hw_to_scsim(hw)->proto_cmd_len;
368 struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
369
370 wr->op_immdlen = cpu_to_be32(FW_WR_OP_V(FW_SCSI_READ_WR) |
371 FW_SCSI_READ_WR_IMMDLEN(imm));
372 wr->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(rn->flowid) |
373 FW_WR_LEN16_V(DIV_ROUND_UP(size, 16)));
374 wr->cookie = (uintptr_t)req;
375 wr->iqid = cpu_to_be16(csio_q_physiqid(hw, req->iq_idx));
376 wr->tmo_val = (uint8_t)(req->tmo);
377 wr->use_xfer_cnt = 1;
378 wr->xfer_cnt = cpu_to_be32(scsi_bufflen(scmnd));
379 wr->ini_xfer_cnt = cpu_to_be32(scsi_bufflen(scmnd));
380 /* Get RSP DMA buffer */
381 dma_buf = &req->dma_buf;
382
383 /* Prepare RSP SGL */
384 wr->rsp_dmalen = cpu_to_be32(dma_buf->len);
385 wr->rsp_dmaaddr = cpu_to_be64(dma_buf->paddr);
386
387 wr->r4 = 0;
388
389 wr->u.fcoe.ctl_pri = 0;
390 wr->u.fcoe.cp_en_class = 0;
391 wr->u.fcoe.r3_lo[0] = 0;
392 wr->u.fcoe.r3_lo[1] = 0;
393 csio_scsi_fcp_cmnd(req, (void *)((uintptr_t)wrp +
394 sizeof(struct fw_scsi_read_wr)));
395
396 /* Move WR pointer past command and immediate data */
397 sgl = (struct ulptx_sgl *)((uintptr_t)wrp +
398 sizeof(struct fw_scsi_read_wr) + ALIGN(imm, 16));
399
400 /* Fill in the DSGL */
401 csio_scsi_init_ultptx_dsgl(hw, req, sgl);
402 }
403
404 /*
405 * csio_scsi_init_write_wr - Initialize the WRITE SCSI WR.
406 * @req: IO req structure.
407 * @wrp: DMA location to place the payload.
408 * @size: Size of WR (including FW WR + immed data + rsp SG entry + data SGL
409 *
410 * Wrapper for populating fw_scsi_write_wr.
411 */
412 static inline void
csio_scsi_init_write_wr(struct csio_ioreq * req,void * wrp,uint32_t size)413 csio_scsi_init_write_wr(struct csio_ioreq *req, void *wrp, uint32_t size)
414 {
415 struct csio_hw *hw = req->lnode->hwp;
416 struct csio_rnode *rn = req->rnode;
417 struct fw_scsi_write_wr *wr = (struct fw_scsi_write_wr *)wrp;
418 struct ulptx_sgl *sgl;
419 struct csio_dma_buf *dma_buf;
420 uint8_t imm = csio_hw_to_scsim(hw)->proto_cmd_len;
421 struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
422
423 wr->op_immdlen = cpu_to_be32(FW_WR_OP_V(FW_SCSI_WRITE_WR) |
424 FW_SCSI_WRITE_WR_IMMDLEN(imm));
425 wr->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(rn->flowid) |
426 FW_WR_LEN16_V(DIV_ROUND_UP(size, 16)));
427 wr->cookie = (uintptr_t)req;
428 wr->iqid = cpu_to_be16(csio_q_physiqid(hw, req->iq_idx));
429 wr->tmo_val = (uint8_t)(req->tmo);
430 wr->use_xfer_cnt = 1;
431 wr->xfer_cnt = cpu_to_be32(scsi_bufflen(scmnd));
432 wr->ini_xfer_cnt = cpu_to_be32(scsi_bufflen(scmnd));
433 /* Get RSP DMA buffer */
434 dma_buf = &req->dma_buf;
435
436 /* Prepare RSP SGL */
437 wr->rsp_dmalen = cpu_to_be32(dma_buf->len);
438 wr->rsp_dmaaddr = cpu_to_be64(dma_buf->paddr);
439
440 wr->r4 = 0;
441
442 wr->u.fcoe.ctl_pri = 0;
443 wr->u.fcoe.cp_en_class = 0;
444 wr->u.fcoe.r3_lo[0] = 0;
445 wr->u.fcoe.r3_lo[1] = 0;
446 csio_scsi_fcp_cmnd(req, (void *)((uintptr_t)wrp +
447 sizeof(struct fw_scsi_write_wr)));
448
449 /* Move WR pointer past command and immediate data */
450 sgl = (struct ulptx_sgl *)((uintptr_t)wrp +
451 sizeof(struct fw_scsi_write_wr) + ALIGN(imm, 16));
452
453 /* Fill in the DSGL */
454 csio_scsi_init_ultptx_dsgl(hw, req, sgl);
455 }
456
457 /* Calculate WR size needed for fw_scsi_read_wr/fw_scsi_write_wr */
458 #define CSIO_SCSI_DATA_WRSZ(req, oper, sz, imm) \
459 do { \
460 (sz) = sizeof(struct fw_scsi_##oper##_wr) + /* WR size */ \
461 ALIGN((imm), 16) + /* Immed data */ \
462 sizeof(struct ulptx_sgl); /* ulptx_sgl */ \
463 \
464 if (unlikely((req)->nsge > 1)) \
465 (sz) += (sizeof(struct ulptx_sge_pair) * \
466 (ALIGN(((req)->nsge - 1), 2) / 2)); \
467 /* Data SGE */ \
468 } while (0)
469
470 /*
471 * csio_scsi_read - Create a SCSI READ WR.
472 * @req: IO req structure.
473 *
474 * Gets a WR slot in the ingress queue and initializes it with
475 * SCSI READ WR.
476 *
477 */
478 static inline void
csio_scsi_read(struct csio_ioreq * req)479 csio_scsi_read(struct csio_ioreq *req)
480 {
481 struct csio_wr_pair wrp;
482 uint32_t size;
483 struct csio_hw *hw = req->lnode->hwp;
484 struct csio_scsim *scsim = csio_hw_to_scsim(hw);
485
486 CSIO_SCSI_DATA_WRSZ(req, read, size, scsim->proto_cmd_len);
487 size = ALIGN(size, 16);
488
489 req->drv_status = csio_wr_get(hw, req->eq_idx, size, &wrp);
490 if (likely(req->drv_status == 0)) {
491 if (likely(wrp.size1 >= size)) {
492 /* Initialize WR in one shot */
493 csio_scsi_init_read_wr(req, wrp.addr1, size);
494 } else {
495 uint8_t *tmpwr = csio_q_eq_wrap(hw, req->eq_idx);
496 /*
497 * Make a temporary copy of the WR and write back
498 * the copy into the WR pair.
499 */
500 csio_scsi_init_read_wr(req, (void *)tmpwr, size);
501 memcpy(wrp.addr1, tmpwr, wrp.size1);
502 memcpy(wrp.addr2, tmpwr + wrp.size1, size - wrp.size1);
503 }
504 }
505 }
506
507 /*
508 * csio_scsi_write - Create a SCSI WRITE WR.
509 * @req: IO req structure.
510 *
511 * Gets a WR slot in the ingress queue and initializes it with
512 * SCSI WRITE WR.
513 *
514 */
515 static inline void
csio_scsi_write(struct csio_ioreq * req)516 csio_scsi_write(struct csio_ioreq *req)
517 {
518 struct csio_wr_pair wrp;
519 uint32_t size;
520 struct csio_hw *hw = req->lnode->hwp;
521 struct csio_scsim *scsim = csio_hw_to_scsim(hw);
522
523 CSIO_SCSI_DATA_WRSZ(req, write, size, scsim->proto_cmd_len);
524 size = ALIGN(size, 16);
525
526 req->drv_status = csio_wr_get(hw, req->eq_idx, size, &wrp);
527 if (likely(req->drv_status == 0)) {
528 if (likely(wrp.size1 >= size)) {
529 /* Initialize WR in one shot */
530 csio_scsi_init_write_wr(req, wrp.addr1, size);
531 } else {
532 uint8_t *tmpwr = csio_q_eq_wrap(hw, req->eq_idx);
533 /*
534 * Make a temporary copy of the WR and write back
535 * the copy into the WR pair.
536 */
537 csio_scsi_init_write_wr(req, (void *)tmpwr, size);
538 memcpy(wrp.addr1, tmpwr, wrp.size1);
539 memcpy(wrp.addr2, tmpwr + wrp.size1, size - wrp.size1);
540 }
541 }
542 }
543
544 /*
545 * csio_setup_ddp - Setup DDP buffers for Read request.
546 * @req: IO req structure.
547 *
548 * Checks SGLs/Data buffers are virtually contiguous required for DDP.
549 * If contiguous,driver posts SGLs in the WR otherwise post internal
550 * buffers for such request for DDP.
551 */
552 static inline void
csio_setup_ddp(struct csio_scsim * scsim,struct csio_ioreq * req)553 csio_setup_ddp(struct csio_scsim *scsim, struct csio_ioreq *req)
554 {
555 #ifdef __CSIO_DEBUG__
556 struct csio_hw *hw = req->lnode->hwp;
557 #endif
558 struct scatterlist *sgel = NULL;
559 struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
560 uint64_t sg_addr = 0;
561 uint32_t ddp_pagesz = 4096;
562 uint32_t buf_off;
563 struct csio_dma_buf *dma_buf = NULL;
564 uint32_t alloc_len = 0;
565 uint32_t xfer_len = 0;
566 uint32_t sg_len = 0;
567 uint32_t i;
568
569 scsi_for_each_sg(scmnd, sgel, req->nsge, i) {
570 sg_addr = sg_dma_address(sgel);
571 sg_len = sg_dma_len(sgel);
572
573 buf_off = sg_addr & (ddp_pagesz - 1);
574
575 /* Except 1st buffer,all buffer addr have to be Page aligned */
576 if (i != 0 && buf_off) {
577 csio_dbg(hw, "SGL addr not DDP aligned (%llx:%d)\n",
578 sg_addr, sg_len);
579 goto unaligned;
580 }
581
582 /* Except last buffer,all buffer must end on page boundary */
583 if ((i != (req->nsge - 1)) &&
584 ((buf_off + sg_len) & (ddp_pagesz - 1))) {
585 csio_dbg(hw,
586 "SGL addr not ending on page boundary"
587 "(%llx:%d)\n", sg_addr, sg_len);
588 goto unaligned;
589 }
590 }
591
592 /* SGL's are virtually contiguous. HW will DDP to SGLs */
593 req->dcopy = 0;
594 csio_scsi_read(req);
595
596 return;
597
598 unaligned:
599 CSIO_INC_STATS(scsim, n_unaligned);
600 /*
601 * For unaligned SGLs, driver will allocate internal DDP buffer.
602 * Once command is completed data from DDP buffer copied to SGLs
603 */
604 req->dcopy = 1;
605
606 /* Use gen_list to store the DDP buffers */
607 INIT_LIST_HEAD(&req->gen_list);
608 xfer_len = scsi_bufflen(scmnd);
609
610 i = 0;
611 /* Allocate ddp buffers for this request */
612 while (alloc_len < xfer_len) {
613 dma_buf = csio_get_scsi_ddp(scsim);
614 if (dma_buf == NULL || i > scsim->max_sge) {
615 req->drv_status = -EBUSY;
616 break;
617 }
618 alloc_len += dma_buf->len;
619 /* Added to IO req */
620 list_add_tail(&dma_buf->list, &req->gen_list);
621 i++;
622 }
623
624 if (!req->drv_status) {
625 /* set number of ddp bufs used */
626 req->nsge = i;
627 csio_scsi_read(req);
628 return;
629 }
630
631 /* release dma descs */
632 if (i > 0)
633 csio_put_scsi_ddp_list(scsim, &req->gen_list, i);
634 }
635
636 /*
637 * csio_scsi_init_abrt_cls_wr - Initialize an ABORT/CLOSE WR.
638 * @req: IO req structure.
639 * @addr: DMA location to place the payload.
640 * @size: Size of WR
641 * @abort: abort OR close
642 *
643 * Wrapper for populating fw_scsi_cmd_wr.
644 */
645 static inline void
csio_scsi_init_abrt_cls_wr(struct csio_ioreq * req,void * addr,uint32_t size,bool abort)646 csio_scsi_init_abrt_cls_wr(struct csio_ioreq *req, void *addr, uint32_t size,
647 bool abort)
648 {
649 struct csio_hw *hw = req->lnode->hwp;
650 struct csio_rnode *rn = req->rnode;
651 struct fw_scsi_abrt_cls_wr *wr = (struct fw_scsi_abrt_cls_wr *)addr;
652
653 wr->op_immdlen = cpu_to_be32(FW_WR_OP_V(FW_SCSI_ABRT_CLS_WR));
654 wr->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(rn->flowid) |
655 FW_WR_LEN16_V(
656 DIV_ROUND_UP(size, 16)));
657
658 wr->cookie = (uintptr_t) req;
659 wr->iqid = cpu_to_be16(csio_q_physiqid(hw, req->iq_idx));
660 wr->tmo_val = (uint8_t) req->tmo;
661 /* 0 for CHK_ALL_IO tells FW to look up t_cookie */
662 wr->sub_opcode_to_chk_all_io =
663 (FW_SCSI_ABRT_CLS_WR_SUB_OPCODE(abort) |
664 FW_SCSI_ABRT_CLS_WR_CHK_ALL_IO(0));
665 wr->r3[0] = 0;
666 wr->r3[1] = 0;
667 wr->r3[2] = 0;
668 wr->r3[3] = 0;
669 /* Since we re-use the same ioreq for abort as well */
670 wr->t_cookie = (uintptr_t) req;
671 }
672
673 static inline void
csio_scsi_abrt_cls(struct csio_ioreq * req,bool abort)674 csio_scsi_abrt_cls(struct csio_ioreq *req, bool abort)
675 {
676 struct csio_wr_pair wrp;
677 struct csio_hw *hw = req->lnode->hwp;
678 uint32_t size = ALIGN(sizeof(struct fw_scsi_abrt_cls_wr), 16);
679
680 req->drv_status = csio_wr_get(hw, req->eq_idx, size, &wrp);
681 if (req->drv_status != 0)
682 return;
683
684 if (wrp.size1 >= size) {
685 /* Initialize WR in one shot */
686 csio_scsi_init_abrt_cls_wr(req, wrp.addr1, size, abort);
687 } else {
688 uint8_t *tmpwr = csio_q_eq_wrap(hw, req->eq_idx);
689 /*
690 * Make a temporary copy of the WR and write back
691 * the copy into the WR pair.
692 */
693 csio_scsi_init_abrt_cls_wr(req, (void *)tmpwr, size, abort);
694 memcpy(wrp.addr1, tmpwr, wrp.size1);
695 memcpy(wrp.addr2, tmpwr + wrp.size1, size - wrp.size1);
696 }
697 }
698
699 /*****************************************************************************/
700 /* START: SCSI SM */
701 /*****************************************************************************/
702 static void
csio_scsis_uninit(struct csio_ioreq * req,enum csio_scsi_ev evt)703 csio_scsis_uninit(struct csio_ioreq *req, enum csio_scsi_ev evt)
704 {
705 struct csio_hw *hw = req->lnode->hwp;
706 struct csio_scsim *scsim = csio_hw_to_scsim(hw);
707
708 switch (evt) {
709 case CSIO_SCSIE_START_IO:
710
711 if (req->nsge) {
712 if (req->datadir == DMA_TO_DEVICE) {
713 req->dcopy = 0;
714 csio_scsi_write(req);
715 } else
716 csio_setup_ddp(scsim, req);
717 } else {
718 csio_scsi_cmd(req);
719 }
720
721 if (likely(req->drv_status == 0)) {
722 /* change state and enqueue on active_q */
723 csio_set_state(&req->sm, csio_scsis_io_active);
724 list_add_tail(&req->sm.sm_list, &scsim->active_q);
725 csio_wr_issue(hw, req->eq_idx, false);
726 CSIO_INC_STATS(scsim, n_active);
727
728 return;
729 }
730 break;
731
732 case CSIO_SCSIE_START_TM:
733 csio_scsi_cmd(req);
734 if (req->drv_status == 0) {
735 /*
736 * NOTE: We collect the affected I/Os prior to issuing
737 * LUN reset, and not after it. This is to prevent
738 * aborting I/Os that get issued after the LUN reset,
739 * but prior to LUN reset completion (in the event that
740 * the host stack has not blocked I/Os to a LUN that is
741 * being reset.
742 */
743 csio_set_state(&req->sm, csio_scsis_tm_active);
744 list_add_tail(&req->sm.sm_list, &scsim->active_q);
745 csio_wr_issue(hw, req->eq_idx, false);
746 CSIO_INC_STATS(scsim, n_tm_active);
747 }
748 return;
749
750 case CSIO_SCSIE_ABORT:
751 case CSIO_SCSIE_CLOSE:
752 /*
753 * NOTE:
754 * We could get here due to :
755 * - a window in the cleanup path of the SCSI module
756 * (csio_scsi_abort_io()). Please see NOTE in this function.
757 * - a window in the time we tried to issue an abort/close
758 * of a request to FW, and the FW completed the request
759 * itself.
760 * Print a message for now, and return INVAL either way.
761 */
762 req->drv_status = -EINVAL;
763 csio_warn(hw, "Trying to abort/close completed IO:%p!\n", req);
764 break;
765
766 default:
767 csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
768 CSIO_DB_ASSERT(0);
769 }
770 }
771
772 static void
csio_scsis_io_active(struct csio_ioreq * req,enum csio_scsi_ev evt)773 csio_scsis_io_active(struct csio_ioreq *req, enum csio_scsi_ev evt)
774 {
775 struct csio_hw *hw = req->lnode->hwp;
776 struct csio_scsim *scm = csio_hw_to_scsim(hw);
777 struct csio_rnode *rn;
778
779 switch (evt) {
780 case CSIO_SCSIE_COMPLETED:
781 CSIO_DEC_STATS(scm, n_active);
782 list_del_init(&req->sm.sm_list);
783 csio_set_state(&req->sm, csio_scsis_uninit);
784 /*
785 * In MSIX mode, with multiple queues, the SCSI compeltions
786 * could reach us sooner than the FW events sent to indicate
787 * I-T nexus loss (link down, remote device logo etc). We
788 * dont want to be returning such I/Os to the upper layer
789 * immediately, since we wouldnt have reported the I-T nexus
790 * loss itself. This forces us to serialize such completions
791 * with the reporting of the I-T nexus loss. Therefore, we
792 * internally queue up such up such completions in the rnode.
793 * The reporting of I-T nexus loss to the upper layer is then
794 * followed by the returning of I/Os in this internal queue.
795 * Having another state alongwith another queue helps us take
796 * actions for events such as ABORT received while we are
797 * in this rnode queue.
798 */
799 if (unlikely(req->wr_status != FW_SUCCESS)) {
800 rn = req->rnode;
801 /*
802 * FW says remote device is lost, but rnode
803 * doesnt reflect it.
804 */
805 if (csio_scsi_itnexus_loss_error(req->wr_status) &&
806 csio_is_rnode_ready(rn)) {
807 csio_set_state(&req->sm,
808 csio_scsis_shost_cmpl_await);
809 list_add_tail(&req->sm.sm_list,
810 &rn->host_cmpl_q);
811 }
812 }
813
814 break;
815
816 case CSIO_SCSIE_ABORT:
817 csio_scsi_abrt_cls(req, SCSI_ABORT);
818 if (req->drv_status == 0) {
819 csio_wr_issue(hw, req->eq_idx, false);
820 csio_set_state(&req->sm, csio_scsis_aborting);
821 }
822 break;
823
824 case CSIO_SCSIE_CLOSE:
825 csio_scsi_abrt_cls(req, SCSI_CLOSE);
826 if (req->drv_status == 0) {
827 csio_wr_issue(hw, req->eq_idx, false);
828 csio_set_state(&req->sm, csio_scsis_closing);
829 }
830 break;
831
832 case CSIO_SCSIE_DRVCLEANUP:
833 req->wr_status = FW_HOSTERROR;
834 CSIO_DEC_STATS(scm, n_active);
835 csio_set_state(&req->sm, csio_scsis_uninit);
836 break;
837
838 default:
839 csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
840 CSIO_DB_ASSERT(0);
841 }
842 }
843
844 static void
csio_scsis_tm_active(struct csio_ioreq * req,enum csio_scsi_ev evt)845 csio_scsis_tm_active(struct csio_ioreq *req, enum csio_scsi_ev evt)
846 {
847 struct csio_hw *hw = req->lnode->hwp;
848 struct csio_scsim *scm = csio_hw_to_scsim(hw);
849
850 switch (evt) {
851 case CSIO_SCSIE_COMPLETED:
852 CSIO_DEC_STATS(scm, n_tm_active);
853 list_del_init(&req->sm.sm_list);
854 csio_set_state(&req->sm, csio_scsis_uninit);
855
856 break;
857
858 case CSIO_SCSIE_ABORT:
859 csio_scsi_abrt_cls(req, SCSI_ABORT);
860 if (req->drv_status == 0) {
861 csio_wr_issue(hw, req->eq_idx, false);
862 csio_set_state(&req->sm, csio_scsis_aborting);
863 }
864 break;
865
866
867 case CSIO_SCSIE_CLOSE:
868 csio_scsi_abrt_cls(req, SCSI_CLOSE);
869 if (req->drv_status == 0) {
870 csio_wr_issue(hw, req->eq_idx, false);
871 csio_set_state(&req->sm, csio_scsis_closing);
872 }
873 break;
874
875 case CSIO_SCSIE_DRVCLEANUP:
876 req->wr_status = FW_HOSTERROR;
877 CSIO_DEC_STATS(scm, n_tm_active);
878 csio_set_state(&req->sm, csio_scsis_uninit);
879 break;
880
881 default:
882 csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
883 CSIO_DB_ASSERT(0);
884 }
885 }
886
887 static void
csio_scsis_aborting(struct csio_ioreq * req,enum csio_scsi_ev evt)888 csio_scsis_aborting(struct csio_ioreq *req, enum csio_scsi_ev evt)
889 {
890 struct csio_hw *hw = req->lnode->hwp;
891 struct csio_scsim *scm = csio_hw_to_scsim(hw);
892
893 switch (evt) {
894 case CSIO_SCSIE_COMPLETED:
895 csio_dbg(hw,
896 "ioreq %p recvd cmpltd (wr_status:%d) "
897 "in aborting st\n", req, req->wr_status);
898 /*
899 * Use -ECANCELED to explicitly tell the ABORTED event that
900 * the original I/O was returned to driver by FW.
901 * We dont really care if the I/O was returned with success by
902 * FW (because the ABORT and completion of the I/O crossed each
903 * other), or any other return value. Once we are in aborting
904 * state, the success or failure of the I/O is unimportant to
905 * us.
906 */
907 req->drv_status = -ECANCELED;
908 break;
909
910 case CSIO_SCSIE_ABORT:
911 CSIO_INC_STATS(scm, n_abrt_dups);
912 break;
913
914 case CSIO_SCSIE_ABORTED:
915
916 csio_dbg(hw, "abort of %p return status:0x%x drv_status:%x\n",
917 req, req->wr_status, req->drv_status);
918 /*
919 * Check if original I/O WR completed before the Abort
920 * completion.
921 */
922 if (req->drv_status != -ECANCELED) {
923 csio_warn(hw,
924 "Abort completed before original I/O,"
925 " req:%p\n", req);
926 CSIO_DB_ASSERT(0);
927 }
928
929 /*
930 * There are the following possible scenarios:
931 * 1. The abort completed successfully, FW returned FW_SUCCESS.
932 * 2. The completion of an I/O and the receipt of
933 * abort for that I/O by the FW crossed each other.
934 * The FW returned FW_EINVAL. The original I/O would have
935 * returned with FW_SUCCESS or any other SCSI error.
936 * 3. The FW couldn't sent the abort out on the wire, as there
937 * was an I-T nexus loss (link down, remote device logged
938 * out etc). FW sent back an appropriate IT nexus loss status
939 * for the abort.
940 * 4. FW sent an abort, but abort timed out (remote device
941 * didnt respond). FW replied back with
942 * FW_SCSI_ABORT_TIMEDOUT.
943 * 5. FW couldn't genuinely abort the request for some reason,
944 * and sent us an error.
945 *
946 * The first 3 scenarios are treated as succesful abort
947 * operations by the host, while the last 2 are failed attempts
948 * to abort. Manipulate the return value of the request
949 * appropriately, so that host can convey these results
950 * back to the upper layer.
951 */
952 if ((req->wr_status == FW_SUCCESS) ||
953 (req->wr_status == FW_EINVAL) ||
954 csio_scsi_itnexus_loss_error(req->wr_status))
955 req->wr_status = FW_SCSI_ABORT_REQUESTED;
956
957 CSIO_DEC_STATS(scm, n_active);
958 list_del_init(&req->sm.sm_list);
959 csio_set_state(&req->sm, csio_scsis_uninit);
960 break;
961
962 case CSIO_SCSIE_DRVCLEANUP:
963 req->wr_status = FW_HOSTERROR;
964 CSIO_DEC_STATS(scm, n_active);
965 csio_set_state(&req->sm, csio_scsis_uninit);
966 break;
967
968 case CSIO_SCSIE_CLOSE:
969 /*
970 * We can receive this event from the module
971 * cleanup paths, if the FW forgot to reply to the ABORT WR
972 * and left this ioreq in this state. For now, just ignore
973 * the event. The CLOSE event is sent to this state, as
974 * the LINK may have already gone down.
975 */
976 break;
977
978 default:
979 csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
980 CSIO_DB_ASSERT(0);
981 }
982 }
983
984 static void
csio_scsis_closing(struct csio_ioreq * req,enum csio_scsi_ev evt)985 csio_scsis_closing(struct csio_ioreq *req, enum csio_scsi_ev evt)
986 {
987 struct csio_hw *hw = req->lnode->hwp;
988 struct csio_scsim *scm = csio_hw_to_scsim(hw);
989
990 switch (evt) {
991 case CSIO_SCSIE_COMPLETED:
992 csio_dbg(hw,
993 "ioreq %p recvd cmpltd (wr_status:%d) "
994 "in closing st\n", req, req->wr_status);
995 /*
996 * Use -ECANCELED to explicitly tell the CLOSED event that
997 * the original I/O was returned to driver by FW.
998 * We dont really care if the I/O was returned with success by
999 * FW (because the CLOSE and completion of the I/O crossed each
1000 * other), or any other return value. Once we are in aborting
1001 * state, the success or failure of the I/O is unimportant to
1002 * us.
1003 */
1004 req->drv_status = -ECANCELED;
1005 break;
1006
1007 case CSIO_SCSIE_CLOSED:
1008 /*
1009 * Check if original I/O WR completed before the Close
1010 * completion.
1011 */
1012 if (req->drv_status != -ECANCELED) {
1013 csio_fatal(hw,
1014 "Close completed before original I/O,"
1015 " req:%p\n", req);
1016 CSIO_DB_ASSERT(0);
1017 }
1018
1019 /*
1020 * Either close succeeded, or we issued close to FW at the
1021 * same time FW compelted it to us. Either way, the I/O
1022 * is closed.
1023 */
1024 CSIO_DB_ASSERT((req->wr_status == FW_SUCCESS) ||
1025 (req->wr_status == FW_EINVAL));
1026 req->wr_status = FW_SCSI_CLOSE_REQUESTED;
1027
1028 CSIO_DEC_STATS(scm, n_active);
1029 list_del_init(&req->sm.sm_list);
1030 csio_set_state(&req->sm, csio_scsis_uninit);
1031 break;
1032
1033 case CSIO_SCSIE_CLOSE:
1034 break;
1035
1036 case CSIO_SCSIE_DRVCLEANUP:
1037 req->wr_status = FW_HOSTERROR;
1038 CSIO_DEC_STATS(scm, n_active);
1039 csio_set_state(&req->sm, csio_scsis_uninit);
1040 break;
1041
1042 default:
1043 csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
1044 CSIO_DB_ASSERT(0);
1045 }
1046 }
1047
1048 static void
csio_scsis_shost_cmpl_await(struct csio_ioreq * req,enum csio_scsi_ev evt)1049 csio_scsis_shost_cmpl_await(struct csio_ioreq *req, enum csio_scsi_ev evt)
1050 {
1051 switch (evt) {
1052 case CSIO_SCSIE_ABORT:
1053 case CSIO_SCSIE_CLOSE:
1054 /*
1055 * Just succeed the abort request, and hope that
1056 * the remote device unregister path will cleanup
1057 * this I/O to the upper layer within a sane
1058 * amount of time.
1059 */
1060 /*
1061 * A close can come in during a LINK DOWN. The FW would have
1062 * returned us the I/O back, but not the remote device lost
1063 * FW event. In this interval, if the I/O times out at the upper
1064 * layer, a close can come in. Take the same action as abort:
1065 * return success, and hope that the remote device unregister
1066 * path will cleanup this I/O. If the FW still doesnt send
1067 * the msg, the close times out, and the upper layer resorts
1068 * to the next level of error recovery.
1069 */
1070 req->drv_status = 0;
1071 break;
1072 case CSIO_SCSIE_DRVCLEANUP:
1073 csio_set_state(&req->sm, csio_scsis_uninit);
1074 break;
1075 default:
1076 csio_dbg(req->lnode->hwp, "Unhandled event:%d sent to req:%p\n",
1077 evt, req);
1078 CSIO_DB_ASSERT(0);
1079 }
1080 }
1081
1082 /*
1083 * csio_scsi_cmpl_handler - WR completion handler for SCSI.
1084 * @hw: HW module.
1085 * @wr: The completed WR from the ingress queue.
1086 * @len: Length of the WR.
1087 * @flb: Freelist buffer array.
1088 * @priv: Private object
1089 * @scsiwr: Pointer to SCSI WR.
1090 *
1091 * This is the WR completion handler called per completion from the
1092 * ISR. It is called with lock held. It walks past the RSS and CPL message
1093 * header where the actual WR is present.
1094 * It then gets the status, WR handle (ioreq pointer) and the len of
1095 * the WR, based on WR opcode. Only on a non-good status is the entire
1096 * WR copied into the WR cache (ioreq->fw_wr).
1097 * The ioreq corresponding to the WR is returned to the caller.
1098 * NOTE: The SCSI queue doesnt allocate a freelist today, hence
1099 * no freelist buffer is expected.
1100 */
1101 struct csio_ioreq *
csio_scsi_cmpl_handler(struct csio_hw * hw,void * wr,uint32_t len,struct csio_fl_dma_buf * flb,void * priv,uint8_t ** scsiwr)1102 csio_scsi_cmpl_handler(struct csio_hw *hw, void *wr, uint32_t len,
1103 struct csio_fl_dma_buf *flb, void *priv, uint8_t **scsiwr)
1104 {
1105 struct csio_ioreq *ioreq = NULL;
1106 struct cpl_fw6_msg *cpl;
1107 uint8_t *tempwr;
1108 uint8_t status;
1109 struct csio_scsim *scm = csio_hw_to_scsim(hw);
1110
1111 /* skip RSS header */
1112 cpl = (struct cpl_fw6_msg *)((uintptr_t)wr + sizeof(__be64));
1113
1114 if (unlikely(cpl->opcode != CPL_FW6_MSG)) {
1115 csio_warn(hw, "Error: Invalid CPL msg %x recvd on SCSI q\n",
1116 cpl->opcode);
1117 CSIO_INC_STATS(scm, n_inval_cplop);
1118 return NULL;
1119 }
1120
1121 tempwr = (uint8_t *)(cpl->data);
1122 status = csio_wr_status(tempwr);
1123 *scsiwr = tempwr;
1124
1125 if (likely((*tempwr == FW_SCSI_READ_WR) ||
1126 (*tempwr == FW_SCSI_WRITE_WR) ||
1127 (*tempwr == FW_SCSI_CMD_WR))) {
1128 ioreq = (struct csio_ioreq *)((uintptr_t)
1129 (((struct fw_scsi_read_wr *)tempwr)->cookie));
1130 CSIO_DB_ASSERT(virt_addr_valid(ioreq));
1131
1132 ioreq->wr_status = status;
1133
1134 return ioreq;
1135 }
1136
1137 if (*tempwr == FW_SCSI_ABRT_CLS_WR) {
1138 ioreq = (struct csio_ioreq *)((uintptr_t)
1139 (((struct fw_scsi_abrt_cls_wr *)tempwr)->cookie));
1140 CSIO_DB_ASSERT(virt_addr_valid(ioreq));
1141
1142 ioreq->wr_status = status;
1143 return ioreq;
1144 }
1145
1146 csio_warn(hw, "WR with invalid opcode in SCSI IQ: %x\n", *tempwr);
1147 CSIO_INC_STATS(scm, n_inval_scsiop);
1148 return NULL;
1149 }
1150
1151 /*
1152 * csio_scsi_cleanup_io_q - Cleanup the given queue.
1153 * @scm: SCSI module.
1154 * @q: Queue to be cleaned up.
1155 *
1156 * Called with lock held. Has to exit with lock held.
1157 */
1158 void
csio_scsi_cleanup_io_q(struct csio_scsim * scm,struct list_head * q)1159 csio_scsi_cleanup_io_q(struct csio_scsim *scm, struct list_head *q)
1160 {
1161 struct csio_hw *hw = scm->hw;
1162 struct csio_ioreq *ioreq;
1163 struct list_head *tmp, *next;
1164 struct scsi_cmnd *scmnd;
1165
1166 /* Call back the completion routines of the active_q */
1167 list_for_each_safe(tmp, next, q) {
1168 ioreq = (struct csio_ioreq *)tmp;
1169 csio_scsi_drvcleanup(ioreq);
1170 list_del_init(&ioreq->sm.sm_list);
1171 scmnd = csio_scsi_cmnd(ioreq);
1172 spin_unlock_irq(&hw->lock);
1173
1174 /*
1175 * Upper layers may have cleared this command, hence this
1176 * check to avoid accessing stale references.
1177 */
1178 if (scmnd != NULL)
1179 ioreq->io_cbfn(hw, ioreq);
1180
1181 spin_lock_irq(&scm->freelist_lock);
1182 csio_put_scsi_ioreq(scm, ioreq);
1183 spin_unlock_irq(&scm->freelist_lock);
1184
1185 spin_lock_irq(&hw->lock);
1186 }
1187 }
1188
1189 #define CSIO_SCSI_ABORT_Q_POLL_MS 2000
1190
1191 static void
csio_abrt_cls(struct csio_ioreq * ioreq,struct scsi_cmnd * scmnd)1192 csio_abrt_cls(struct csio_ioreq *ioreq, struct scsi_cmnd *scmnd)
1193 {
1194 struct csio_lnode *ln = ioreq->lnode;
1195 struct csio_hw *hw = ln->hwp;
1196 int ready = 0;
1197 struct csio_scsim *scsim = csio_hw_to_scsim(hw);
1198 int rv;
1199
1200 if (csio_scsi_cmnd(ioreq) != scmnd) {
1201 CSIO_INC_STATS(scsim, n_abrt_race_comp);
1202 return;
1203 }
1204
1205 ready = csio_is_lnode_ready(ln);
1206
1207 rv = csio_do_abrt_cls(hw, ioreq, (ready ? SCSI_ABORT : SCSI_CLOSE));
1208 if (rv != 0) {
1209 if (ready)
1210 CSIO_INC_STATS(scsim, n_abrt_busy_error);
1211 else
1212 CSIO_INC_STATS(scsim, n_cls_busy_error);
1213 }
1214 }
1215
1216 /*
1217 * csio_scsi_abort_io_q - Abort all I/Os on given queue
1218 * @scm: SCSI module.
1219 * @q: Queue to abort.
1220 * @tmo: Timeout in ms
1221 *
1222 * Attempt to abort all I/Os on given queue, and wait for a max
1223 * of tmo milliseconds for them to complete. Returns success
1224 * if all I/Os are aborted. Else returns -ETIMEDOUT.
1225 * Should be entered with lock held. Exits with lock held.
1226 * NOTE:
1227 * Lock has to be held across the loop that aborts I/Os, since dropping the lock
1228 * in between can cause the list to be corrupted. As a result, the caller
1229 * of this function has to ensure that the number of I/os to be aborted
1230 * is finite enough to not cause lock-held-for-too-long issues.
1231 */
1232 static int
csio_scsi_abort_io_q(struct csio_scsim * scm,struct list_head * q,uint32_t tmo)1233 csio_scsi_abort_io_q(struct csio_scsim *scm, struct list_head *q, uint32_t tmo)
1234 {
1235 struct csio_hw *hw = scm->hw;
1236 struct list_head *tmp, *next;
1237 int count = DIV_ROUND_UP(tmo, CSIO_SCSI_ABORT_Q_POLL_MS);
1238 struct scsi_cmnd *scmnd;
1239
1240 if (list_empty(q))
1241 return 0;
1242
1243 csio_dbg(hw, "Aborting SCSI I/Os\n");
1244
1245 /* Now abort/close I/Os in the queue passed */
1246 list_for_each_safe(tmp, next, q) {
1247 scmnd = csio_scsi_cmnd((struct csio_ioreq *)tmp);
1248 csio_abrt_cls((struct csio_ioreq *)tmp, scmnd);
1249 }
1250
1251 /* Wait till all active I/Os are completed/aborted/closed */
1252 while (!list_empty(q) && count--) {
1253 spin_unlock_irq(&hw->lock);
1254 msleep(CSIO_SCSI_ABORT_Q_POLL_MS);
1255 spin_lock_irq(&hw->lock);
1256 }
1257
1258 /* all aborts completed */
1259 if (list_empty(q))
1260 return 0;
1261
1262 return -ETIMEDOUT;
1263 }
1264
1265 /*
1266 * csio_scsim_cleanup_io - Cleanup all I/Os in SCSI module.
1267 * @scm: SCSI module.
1268 * @abort: abort required.
1269 * Called with lock held, should exit with lock held.
1270 * Can sleep when waiting for I/Os to complete.
1271 */
1272 int
csio_scsim_cleanup_io(struct csio_scsim * scm,bool abort)1273 csio_scsim_cleanup_io(struct csio_scsim *scm, bool abort)
1274 {
1275 struct csio_hw *hw = scm->hw;
1276 int rv = 0;
1277 int count = DIV_ROUND_UP(60 * 1000, CSIO_SCSI_ABORT_Q_POLL_MS);
1278
1279 /* No I/Os pending */
1280 if (list_empty(&scm->active_q))
1281 return 0;
1282
1283 /* Wait until all active I/Os are completed */
1284 while (!list_empty(&scm->active_q) && count--) {
1285 spin_unlock_irq(&hw->lock);
1286 msleep(CSIO_SCSI_ABORT_Q_POLL_MS);
1287 spin_lock_irq(&hw->lock);
1288 }
1289
1290 /* all I/Os completed */
1291 if (list_empty(&scm->active_q))
1292 return 0;
1293
1294 /* Else abort */
1295 if (abort) {
1296 rv = csio_scsi_abort_io_q(scm, &scm->active_q, 30000);
1297 if (rv == 0)
1298 return rv;
1299 csio_dbg(hw, "Some I/O aborts timed out, cleaning up..\n");
1300 }
1301
1302 csio_scsi_cleanup_io_q(scm, &scm->active_q);
1303
1304 CSIO_DB_ASSERT(list_empty(&scm->active_q));
1305
1306 return rv;
1307 }
1308
1309 /*
1310 * csio_scsim_cleanup_io_lnode - Cleanup all I/Os of given lnode.
1311 * @scm: SCSI module.
1312 * @lnode: lnode
1313 *
1314 * Called with lock held, should exit with lock held.
1315 * Can sleep (with dropped lock) when waiting for I/Os to complete.
1316 */
1317 int
csio_scsim_cleanup_io_lnode(struct csio_scsim * scm,struct csio_lnode * ln)1318 csio_scsim_cleanup_io_lnode(struct csio_scsim *scm, struct csio_lnode *ln)
1319 {
1320 struct csio_hw *hw = scm->hw;
1321 struct csio_scsi_level_data sld;
1322 int rv;
1323 int count = DIV_ROUND_UP(60 * 1000, CSIO_SCSI_ABORT_Q_POLL_MS);
1324
1325 csio_dbg(hw, "Gathering all SCSI I/Os on lnode %p\n", ln);
1326
1327 sld.level = CSIO_LEV_LNODE;
1328 sld.lnode = ln;
1329 INIT_LIST_HEAD(&ln->cmpl_q);
1330 csio_scsi_gather_active_ios(scm, &sld, &ln->cmpl_q);
1331
1332 /* No I/Os pending on this lnode */
1333 if (list_empty(&ln->cmpl_q))
1334 return 0;
1335
1336 /* Wait until all active I/Os on this lnode are completed */
1337 while (!list_empty(&ln->cmpl_q) && count--) {
1338 spin_unlock_irq(&hw->lock);
1339 msleep(CSIO_SCSI_ABORT_Q_POLL_MS);
1340 spin_lock_irq(&hw->lock);
1341 }
1342
1343 /* all I/Os completed */
1344 if (list_empty(&ln->cmpl_q))
1345 return 0;
1346
1347 csio_dbg(hw, "Some I/Os pending on ln:%p, aborting them..\n", ln);
1348
1349 /* I/Os are pending, abort them */
1350 rv = csio_scsi_abort_io_q(scm, &ln->cmpl_q, 30000);
1351 if (rv != 0) {
1352 csio_dbg(hw, "Some I/O aborts timed out, cleaning up..\n");
1353 csio_scsi_cleanup_io_q(scm, &ln->cmpl_q);
1354 }
1355
1356 CSIO_DB_ASSERT(list_empty(&ln->cmpl_q));
1357
1358 return rv;
1359 }
1360
1361 static ssize_t
csio_show_hw_state(struct device * dev,struct device_attribute * attr,char * buf)1362 csio_show_hw_state(struct device *dev,
1363 struct device_attribute *attr, char *buf)
1364 {
1365 struct csio_lnode *ln = shost_priv(class_to_shost(dev));
1366 struct csio_hw *hw = csio_lnode_to_hw(ln);
1367
1368 if (csio_is_hw_ready(hw))
1369 return sysfs_emit(buf, "ready\n");
1370
1371 return sysfs_emit(buf, "not ready\n");
1372 }
1373
1374 /* Device reset */
1375 static ssize_t
csio_device_reset(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1376 csio_device_reset(struct device *dev,
1377 struct device_attribute *attr, const char *buf, size_t count)
1378 {
1379 struct csio_lnode *ln = shost_priv(class_to_shost(dev));
1380 struct csio_hw *hw = csio_lnode_to_hw(ln);
1381
1382 if (*buf != '1')
1383 return -EINVAL;
1384
1385 /* Delete NPIV lnodes */
1386 csio_lnodes_exit(hw, 1);
1387
1388 /* Block upper IOs */
1389 csio_lnodes_block_request(hw);
1390
1391 spin_lock_irq(&hw->lock);
1392 csio_hw_reset(hw);
1393 spin_unlock_irq(&hw->lock);
1394
1395 /* Unblock upper IOs */
1396 csio_lnodes_unblock_request(hw);
1397 return count;
1398 }
1399
1400 /* disable port */
1401 static ssize_t
csio_disable_port(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1402 csio_disable_port(struct device *dev,
1403 struct device_attribute *attr, const char *buf, size_t count)
1404 {
1405 struct csio_lnode *ln = shost_priv(class_to_shost(dev));
1406 struct csio_hw *hw = csio_lnode_to_hw(ln);
1407 bool disable;
1408
1409 if (*buf == '1' || *buf == '0')
1410 disable = (*buf == '1') ? true : false;
1411 else
1412 return -EINVAL;
1413
1414 /* Block upper IOs */
1415 csio_lnodes_block_by_port(hw, ln->portid);
1416
1417 spin_lock_irq(&hw->lock);
1418 csio_disable_lnodes(hw, ln->portid, disable);
1419 spin_unlock_irq(&hw->lock);
1420
1421 /* Unblock upper IOs */
1422 csio_lnodes_unblock_by_port(hw, ln->portid);
1423 return count;
1424 }
1425
1426 /* Show debug level */
1427 static ssize_t
csio_show_dbg_level(struct device * dev,struct device_attribute * attr,char * buf)1428 csio_show_dbg_level(struct device *dev,
1429 struct device_attribute *attr, char *buf)
1430 {
1431 struct csio_lnode *ln = shost_priv(class_to_shost(dev));
1432
1433 return sysfs_emit(buf, "%x\n", ln->params.log_level);
1434 }
1435
1436 /* Store debug level */
1437 static ssize_t
csio_store_dbg_level(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1438 csio_store_dbg_level(struct device *dev,
1439 struct device_attribute *attr, const char *buf, size_t count)
1440 {
1441 struct csio_lnode *ln = shost_priv(class_to_shost(dev));
1442 struct csio_hw *hw = csio_lnode_to_hw(ln);
1443 uint32_t dbg_level = 0;
1444
1445 if (!isdigit(buf[0]))
1446 return -EINVAL;
1447
1448 if (sscanf(buf, "%i", &dbg_level))
1449 return -EINVAL;
1450
1451 ln->params.log_level = dbg_level;
1452 hw->params.log_level = dbg_level;
1453
1454 return 0;
1455 }
1456
1457 static DEVICE_ATTR(hw_state, S_IRUGO, csio_show_hw_state, NULL);
1458 static DEVICE_ATTR(device_reset, S_IWUSR, NULL, csio_device_reset);
1459 static DEVICE_ATTR(disable_port, S_IWUSR, NULL, csio_disable_port);
1460 static DEVICE_ATTR(dbg_level, S_IRUGO | S_IWUSR, csio_show_dbg_level,
1461 csio_store_dbg_level);
1462
1463 static struct attribute *csio_fcoe_lport_attrs[] = {
1464 &dev_attr_hw_state.attr,
1465 &dev_attr_device_reset.attr,
1466 &dev_attr_disable_port.attr,
1467 &dev_attr_dbg_level.attr,
1468 NULL,
1469 };
1470
1471 ATTRIBUTE_GROUPS(csio_fcoe_lport);
1472
1473 static ssize_t
csio_show_num_reg_rnodes(struct device * dev,struct device_attribute * attr,char * buf)1474 csio_show_num_reg_rnodes(struct device *dev,
1475 struct device_attribute *attr, char *buf)
1476 {
1477 struct csio_lnode *ln = shost_priv(class_to_shost(dev));
1478
1479 return sysfs_emit(buf, "%d\n", ln->num_reg_rnodes);
1480 }
1481
1482 static DEVICE_ATTR(num_reg_rnodes, S_IRUGO, csio_show_num_reg_rnodes, NULL);
1483
1484 static struct attribute *csio_fcoe_vport_attrs[] = {
1485 &dev_attr_num_reg_rnodes.attr,
1486 &dev_attr_dbg_level.attr,
1487 NULL,
1488 };
1489
1490 ATTRIBUTE_GROUPS(csio_fcoe_vport);
1491
1492 static inline uint32_t
csio_scsi_copy_to_sgl(struct csio_hw * hw,struct csio_ioreq * req)1493 csio_scsi_copy_to_sgl(struct csio_hw *hw, struct csio_ioreq *req)
1494 {
1495 struct scsi_cmnd *scmnd = (struct scsi_cmnd *)csio_scsi_cmnd(req);
1496 struct scatterlist *sg;
1497 uint32_t bytes_left;
1498 uint32_t bytes_copy;
1499 uint32_t buf_off = 0;
1500 uint32_t start_off = 0;
1501 uint32_t sg_off = 0;
1502 void *sg_addr;
1503 void *buf_addr;
1504 struct csio_dma_buf *dma_buf;
1505
1506 bytes_left = scsi_bufflen(scmnd);
1507 sg = scsi_sglist(scmnd);
1508 dma_buf = (struct csio_dma_buf *)csio_list_next(&req->gen_list);
1509
1510 /* Copy data from driver buffer to SGs of SCSI CMD */
1511 while (bytes_left > 0 && sg && dma_buf) {
1512 if (buf_off >= dma_buf->len) {
1513 buf_off = 0;
1514 dma_buf = (struct csio_dma_buf *)
1515 csio_list_next(dma_buf);
1516 continue;
1517 }
1518
1519 if (start_off >= sg->length) {
1520 start_off -= sg->length;
1521 sg = sg_next(sg);
1522 continue;
1523 }
1524
1525 buf_addr = dma_buf->vaddr + buf_off;
1526 sg_off = sg->offset + start_off;
1527 bytes_copy = min((dma_buf->len - buf_off),
1528 sg->length - start_off);
1529 bytes_copy = min((uint32_t)(PAGE_SIZE - (sg_off & ~PAGE_MASK)),
1530 bytes_copy);
1531
1532 sg_addr = kmap_atomic(sg_page(sg) + (sg_off >> PAGE_SHIFT));
1533 if (!sg_addr) {
1534 csio_err(hw, "failed to kmap sg:%p of ioreq:%p\n",
1535 sg, req);
1536 break;
1537 }
1538
1539 csio_dbg(hw, "copy_to_sgl:sg_addr %p sg_off %d buf %p len %d\n",
1540 sg_addr, sg_off, buf_addr, bytes_copy);
1541 memcpy(sg_addr + (sg_off & ~PAGE_MASK), buf_addr, bytes_copy);
1542 kunmap_atomic(sg_addr);
1543
1544 start_off += bytes_copy;
1545 buf_off += bytes_copy;
1546 bytes_left -= bytes_copy;
1547 }
1548
1549 if (bytes_left > 0)
1550 return DID_ERROR;
1551 else
1552 return DID_OK;
1553 }
1554
1555 /*
1556 * csio_scsi_err_handler - SCSI error handler.
1557 * @hw: HW module.
1558 * @req: IO request.
1559 *
1560 */
1561 static inline void
csio_scsi_err_handler(struct csio_hw * hw,struct csio_ioreq * req)1562 csio_scsi_err_handler(struct csio_hw *hw, struct csio_ioreq *req)
1563 {
1564 struct scsi_cmnd *cmnd = (struct scsi_cmnd *)csio_scsi_cmnd(req);
1565 struct csio_scsim *scm = csio_hw_to_scsim(hw);
1566 struct fcp_resp_with_ext *fcp_resp;
1567 struct fcp_resp_rsp_info *rsp_info;
1568 struct csio_dma_buf *dma_buf;
1569 uint8_t flags, scsi_status = 0;
1570 uint32_t host_status = DID_OK;
1571 uint32_t rsp_len = 0, sns_len = 0;
1572 struct csio_rnode *rn = (struct csio_rnode *)(cmnd->device->hostdata);
1573
1574
1575 switch (req->wr_status) {
1576 case FW_HOSTERROR:
1577 if (unlikely(!csio_is_hw_ready(hw)))
1578 return;
1579
1580 host_status = DID_ERROR;
1581 CSIO_INC_STATS(scm, n_hosterror);
1582
1583 break;
1584 case FW_SCSI_RSP_ERR:
1585 dma_buf = &req->dma_buf;
1586 fcp_resp = (struct fcp_resp_with_ext *)dma_buf->vaddr;
1587 rsp_info = (struct fcp_resp_rsp_info *)(fcp_resp + 1);
1588 flags = fcp_resp->resp.fr_flags;
1589 scsi_status = fcp_resp->resp.fr_status;
1590
1591 if (flags & FCP_RSP_LEN_VAL) {
1592 rsp_len = be32_to_cpu(fcp_resp->ext.fr_rsp_len);
1593 if ((rsp_len != 0 && rsp_len != 4 && rsp_len != 8) ||
1594 (rsp_info->rsp_code != FCP_TMF_CMPL)) {
1595 host_status = DID_ERROR;
1596 goto out;
1597 }
1598 }
1599
1600 if ((flags & FCP_SNS_LEN_VAL) && fcp_resp->ext.fr_sns_len) {
1601 sns_len = be32_to_cpu(fcp_resp->ext.fr_sns_len);
1602 if (sns_len > SCSI_SENSE_BUFFERSIZE)
1603 sns_len = SCSI_SENSE_BUFFERSIZE;
1604
1605 memcpy(cmnd->sense_buffer,
1606 &rsp_info->_fr_resvd[0] + rsp_len, sns_len);
1607 CSIO_INC_STATS(scm, n_autosense);
1608 }
1609
1610 scsi_set_resid(cmnd, 0);
1611
1612 /* Under run */
1613 if (flags & FCP_RESID_UNDER) {
1614 scsi_set_resid(cmnd,
1615 be32_to_cpu(fcp_resp->ext.fr_resid));
1616
1617 if (!(flags & FCP_SNS_LEN_VAL) &&
1618 (scsi_status == SAM_STAT_GOOD) &&
1619 ((scsi_bufflen(cmnd) - scsi_get_resid(cmnd))
1620 < cmnd->underflow))
1621 host_status = DID_ERROR;
1622 } else if (flags & FCP_RESID_OVER)
1623 host_status = DID_ERROR;
1624
1625 CSIO_INC_STATS(scm, n_rsperror);
1626 break;
1627
1628 case FW_SCSI_OVER_FLOW_ERR:
1629 csio_warn(hw,
1630 "Over-flow error,cmnd:0x%x expected len:0x%x"
1631 " resid:0x%x\n", cmnd->cmnd[0],
1632 scsi_bufflen(cmnd), scsi_get_resid(cmnd));
1633 host_status = DID_ERROR;
1634 CSIO_INC_STATS(scm, n_ovflerror);
1635 break;
1636
1637 case FW_SCSI_UNDER_FLOW_ERR:
1638 csio_warn(hw,
1639 "Under-flow error,cmnd:0x%x expected"
1640 " len:0x%x resid:0x%x lun:0x%llx ssn:0x%x\n",
1641 cmnd->cmnd[0], scsi_bufflen(cmnd),
1642 scsi_get_resid(cmnd), cmnd->device->lun,
1643 rn->flowid);
1644 host_status = DID_ERROR;
1645 CSIO_INC_STATS(scm, n_unflerror);
1646 break;
1647
1648 case FW_SCSI_ABORT_REQUESTED:
1649 case FW_SCSI_ABORTED:
1650 case FW_SCSI_CLOSE_REQUESTED:
1651 csio_dbg(hw, "Req %p cmd:%p op:%x %s\n", req, cmnd,
1652 cmnd->cmnd[0],
1653 (req->wr_status == FW_SCSI_CLOSE_REQUESTED) ?
1654 "closed" : "aborted");
1655 /*
1656 * csio_eh_abort_handler checks this value to
1657 * succeed or fail the abort request.
1658 */
1659 host_status = DID_REQUEUE;
1660 if (req->wr_status == FW_SCSI_CLOSE_REQUESTED)
1661 CSIO_INC_STATS(scm, n_closed);
1662 else
1663 CSIO_INC_STATS(scm, n_aborted);
1664 break;
1665
1666 case FW_SCSI_ABORT_TIMEDOUT:
1667 /* FW timed out the abort itself */
1668 csio_dbg(hw, "FW timed out abort req:%p cmnd:%p status:%x\n",
1669 req, cmnd, req->wr_status);
1670 host_status = DID_ERROR;
1671 CSIO_INC_STATS(scm, n_abrt_timedout);
1672 break;
1673
1674 case FW_RDEV_NOT_READY:
1675 /*
1676 * In firmware, a RDEV can get into this state
1677 * temporarily, before moving into dissapeared/lost
1678 * state. So, the driver should complete the request equivalent
1679 * to device-disappeared!
1680 */
1681 CSIO_INC_STATS(scm, n_rdev_nr_error);
1682 host_status = DID_ERROR;
1683 break;
1684
1685 case FW_ERR_RDEV_LOST:
1686 CSIO_INC_STATS(scm, n_rdev_lost_error);
1687 host_status = DID_ERROR;
1688 break;
1689
1690 case FW_ERR_RDEV_LOGO:
1691 CSIO_INC_STATS(scm, n_rdev_logo_error);
1692 host_status = DID_ERROR;
1693 break;
1694
1695 case FW_ERR_RDEV_IMPL_LOGO:
1696 host_status = DID_ERROR;
1697 break;
1698
1699 case FW_ERR_LINK_DOWN:
1700 CSIO_INC_STATS(scm, n_link_down_error);
1701 host_status = DID_ERROR;
1702 break;
1703
1704 case FW_FCOE_NO_XCHG:
1705 CSIO_INC_STATS(scm, n_no_xchg_error);
1706 host_status = DID_ERROR;
1707 break;
1708
1709 default:
1710 csio_err(hw, "Unknown SCSI FW WR status:%d req:%p cmnd:%p\n",
1711 req->wr_status, req, cmnd);
1712 CSIO_DB_ASSERT(0);
1713
1714 CSIO_INC_STATS(scm, n_unknown_error);
1715 host_status = DID_ERROR;
1716 break;
1717 }
1718
1719 out:
1720 if (req->nsge > 0) {
1721 scsi_dma_unmap(cmnd);
1722 if (req->dcopy && (host_status == DID_OK))
1723 host_status = csio_scsi_copy_to_sgl(hw, req);
1724 }
1725
1726 cmnd->result = (((host_status) << 16) | scsi_status);
1727 scsi_done(cmnd);
1728
1729 /* Wake up waiting threads */
1730 csio_scsi_cmnd(req) = NULL;
1731 complete(&req->cmplobj);
1732 }
1733
1734 /*
1735 * csio_scsi_cbfn - SCSI callback function.
1736 * @hw: HW module.
1737 * @req: IO request.
1738 *
1739 */
1740 static void
csio_scsi_cbfn(struct csio_hw * hw,struct csio_ioreq * req)1741 csio_scsi_cbfn(struct csio_hw *hw, struct csio_ioreq *req)
1742 {
1743 struct scsi_cmnd *cmnd = (struct scsi_cmnd *)csio_scsi_cmnd(req);
1744 uint8_t scsi_status = SAM_STAT_GOOD;
1745 uint32_t host_status = DID_OK;
1746
1747 if (likely(req->wr_status == FW_SUCCESS)) {
1748 if (req->nsge > 0) {
1749 scsi_dma_unmap(cmnd);
1750 if (req->dcopy)
1751 host_status = csio_scsi_copy_to_sgl(hw, req);
1752 }
1753
1754 cmnd->result = (((host_status) << 16) | scsi_status);
1755 scsi_done(cmnd);
1756 csio_scsi_cmnd(req) = NULL;
1757 CSIO_INC_STATS(csio_hw_to_scsim(hw), n_tot_success);
1758 } else {
1759 /* Error handling */
1760 csio_scsi_err_handler(hw, req);
1761 }
1762 }
1763
1764 /**
1765 * csio_queuecommand - Entry point to kickstart an I/O request.
1766 * @host: The scsi_host pointer.
1767 * @cmnd: The I/O request from ML.
1768 *
1769 * This routine does the following:
1770 * - Checks for HW and Rnode module readiness.
1771 * - Gets a free ioreq structure (which is already initialized
1772 * to uninit during its allocation).
1773 * - Maps SG elements.
1774 * - Initializes ioreq members.
1775 * - Kicks off the SCSI state machine for this IO.
1776 * - Returns busy status on error.
1777 */
1778 static int
csio_queuecommand(struct Scsi_Host * host,struct scsi_cmnd * cmnd)1779 csio_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmnd)
1780 {
1781 struct csio_lnode *ln = shost_priv(host);
1782 struct csio_hw *hw = csio_lnode_to_hw(ln);
1783 struct csio_scsim *scsim = csio_hw_to_scsim(hw);
1784 struct csio_rnode *rn = (struct csio_rnode *)(cmnd->device->hostdata);
1785 struct csio_ioreq *ioreq = NULL;
1786 unsigned long flags;
1787 int nsge = 0;
1788 int rv = SCSI_MLQUEUE_HOST_BUSY, nr;
1789 int retval;
1790 struct csio_scsi_qset *sqset;
1791 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1792
1793 sqset = &hw->sqset[ln->portid][blk_mq_rq_cpu(scsi_cmd_to_rq(cmnd))];
1794
1795 nr = fc_remote_port_chkready(rport);
1796 if (nr) {
1797 cmnd->result = nr;
1798 CSIO_INC_STATS(scsim, n_rn_nr_error);
1799 goto err_done;
1800 }
1801
1802 if (unlikely(!csio_is_hw_ready(hw))) {
1803 cmnd->result = (DID_REQUEUE << 16);
1804 CSIO_INC_STATS(scsim, n_hw_nr_error);
1805 goto err_done;
1806 }
1807
1808 /* Get req->nsge, if there are SG elements to be mapped */
1809 nsge = scsi_dma_map(cmnd);
1810 if (unlikely(nsge < 0)) {
1811 CSIO_INC_STATS(scsim, n_dmamap_error);
1812 goto err;
1813 }
1814
1815 /* Do we support so many mappings? */
1816 if (unlikely(nsge > scsim->max_sge)) {
1817 csio_warn(hw,
1818 "More SGEs than can be supported."
1819 " SGEs: %d, Max SGEs: %d\n", nsge, scsim->max_sge);
1820 CSIO_INC_STATS(scsim, n_unsupp_sge_error);
1821 goto err_dma_unmap;
1822 }
1823
1824 /* Get a free ioreq structure - SM is already set to uninit */
1825 ioreq = csio_get_scsi_ioreq_lock(hw, scsim);
1826 if (!ioreq) {
1827 csio_err(hw, "Out of I/O request elements. Active #:%d\n",
1828 scsim->stats.n_active);
1829 CSIO_INC_STATS(scsim, n_no_req_error);
1830 goto err_dma_unmap;
1831 }
1832
1833 ioreq->nsge = nsge;
1834 ioreq->lnode = ln;
1835 ioreq->rnode = rn;
1836 ioreq->iq_idx = sqset->iq_idx;
1837 ioreq->eq_idx = sqset->eq_idx;
1838 ioreq->wr_status = 0;
1839 ioreq->drv_status = 0;
1840 csio_scsi_cmnd(ioreq) = (void *)cmnd;
1841 ioreq->tmo = 0;
1842 ioreq->datadir = cmnd->sc_data_direction;
1843
1844 if (cmnd->sc_data_direction == DMA_TO_DEVICE) {
1845 CSIO_INC_STATS(ln, n_output_requests);
1846 ln->stats.n_output_bytes += scsi_bufflen(cmnd);
1847 } else if (cmnd->sc_data_direction == DMA_FROM_DEVICE) {
1848 CSIO_INC_STATS(ln, n_input_requests);
1849 ln->stats.n_input_bytes += scsi_bufflen(cmnd);
1850 } else
1851 CSIO_INC_STATS(ln, n_control_requests);
1852
1853 /* Set cbfn */
1854 ioreq->io_cbfn = csio_scsi_cbfn;
1855
1856 /* Needed during abort */
1857 cmnd->host_scribble = (unsigned char *)ioreq;
1858 csio_priv(cmnd)->fc_tm_flags = 0;
1859
1860 /* Kick off SCSI IO SM on the ioreq */
1861 spin_lock_irqsave(&hw->lock, flags);
1862 retval = csio_scsi_start_io(ioreq);
1863 spin_unlock_irqrestore(&hw->lock, flags);
1864
1865 if (retval != 0) {
1866 csio_err(hw, "ioreq: %p couldn't be started, status:%d\n",
1867 ioreq, retval);
1868 CSIO_INC_STATS(scsim, n_busy_error);
1869 goto err_put_req;
1870 }
1871
1872 return 0;
1873
1874 err_put_req:
1875 csio_put_scsi_ioreq_lock(hw, scsim, ioreq);
1876 err_dma_unmap:
1877 if (nsge > 0)
1878 scsi_dma_unmap(cmnd);
1879 err:
1880 return rv;
1881
1882 err_done:
1883 scsi_done(cmnd);
1884 return 0;
1885 }
1886
1887 static int
csio_do_abrt_cls(struct csio_hw * hw,struct csio_ioreq * ioreq,bool abort)1888 csio_do_abrt_cls(struct csio_hw *hw, struct csio_ioreq *ioreq, bool abort)
1889 {
1890 int rv;
1891 int cpu = smp_processor_id();
1892 struct csio_lnode *ln = ioreq->lnode;
1893 struct csio_scsi_qset *sqset = &hw->sqset[ln->portid][cpu];
1894
1895 ioreq->tmo = CSIO_SCSI_ABRT_TMO_MS;
1896 /*
1897 * Use current processor queue for posting the abort/close, but retain
1898 * the ingress queue ID of the original I/O being aborted/closed - we
1899 * need the abort/close completion to be received on the same queue
1900 * as the original I/O.
1901 */
1902 ioreq->eq_idx = sqset->eq_idx;
1903
1904 if (abort == SCSI_ABORT)
1905 rv = csio_scsi_abort(ioreq);
1906 else
1907 rv = csio_scsi_close(ioreq);
1908
1909 return rv;
1910 }
1911
1912 static int
csio_eh_abort_handler(struct scsi_cmnd * cmnd)1913 csio_eh_abort_handler(struct scsi_cmnd *cmnd)
1914 {
1915 struct csio_ioreq *ioreq;
1916 struct csio_lnode *ln = shost_priv(cmnd->device->host);
1917 struct csio_hw *hw = csio_lnode_to_hw(ln);
1918 struct csio_scsim *scsim = csio_hw_to_scsim(hw);
1919 int ready = 0, ret;
1920 unsigned long tmo = 0;
1921 int rv;
1922 struct csio_rnode *rn = (struct csio_rnode *)(cmnd->device->hostdata);
1923
1924 ret = fc_block_scsi_eh(cmnd);
1925 if (ret)
1926 return ret;
1927
1928 ioreq = (struct csio_ioreq *)cmnd->host_scribble;
1929 if (!ioreq)
1930 return SUCCESS;
1931
1932 if (!rn)
1933 return FAILED;
1934
1935 csio_dbg(hw,
1936 "Request to abort ioreq:%p cmd:%p cdb:%08llx"
1937 " ssni:0x%x lun:%llu iq:0x%x\n",
1938 ioreq, cmnd, *((uint64_t *)cmnd->cmnd), rn->flowid,
1939 cmnd->device->lun, csio_q_physiqid(hw, ioreq->iq_idx));
1940
1941 if (((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) != cmnd) {
1942 CSIO_INC_STATS(scsim, n_abrt_race_comp);
1943 return SUCCESS;
1944 }
1945
1946 ready = csio_is_lnode_ready(ln);
1947 tmo = CSIO_SCSI_ABRT_TMO_MS;
1948
1949 reinit_completion(&ioreq->cmplobj);
1950 spin_lock_irq(&hw->lock);
1951 rv = csio_do_abrt_cls(hw, ioreq, (ready ? SCSI_ABORT : SCSI_CLOSE));
1952 spin_unlock_irq(&hw->lock);
1953
1954 if (rv != 0) {
1955 if (rv == -EINVAL) {
1956 /* Return success, if abort/close request issued on
1957 * already completed IO
1958 */
1959 return SUCCESS;
1960 }
1961 if (ready)
1962 CSIO_INC_STATS(scsim, n_abrt_busy_error);
1963 else
1964 CSIO_INC_STATS(scsim, n_cls_busy_error);
1965
1966 goto inval_scmnd;
1967 }
1968
1969 wait_for_completion_timeout(&ioreq->cmplobj, msecs_to_jiffies(tmo));
1970
1971 /* FW didnt respond to abort within our timeout */
1972 if (((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == cmnd) {
1973
1974 csio_err(hw, "Abort timed out -- req: %p\n", ioreq);
1975 CSIO_INC_STATS(scsim, n_abrt_timedout);
1976
1977 inval_scmnd:
1978 if (ioreq->nsge > 0)
1979 scsi_dma_unmap(cmnd);
1980
1981 spin_lock_irq(&hw->lock);
1982 csio_scsi_cmnd(ioreq) = NULL;
1983 spin_unlock_irq(&hw->lock);
1984
1985 cmnd->result = (DID_ERROR << 16);
1986 scsi_done(cmnd);
1987
1988 return FAILED;
1989 }
1990
1991 /* FW successfully aborted the request */
1992 if (host_byte(cmnd->result) == DID_REQUEUE) {
1993 csio_info(hw,
1994 "Aborted SCSI command to (%d:%llu) tag %u\n",
1995 cmnd->device->id, cmnd->device->lun,
1996 scsi_cmd_to_rq(cmnd)->tag);
1997 return SUCCESS;
1998 } else {
1999 csio_info(hw,
2000 "Failed to abort SCSI command, (%d:%llu) tag %u\n",
2001 cmnd->device->id, cmnd->device->lun,
2002 scsi_cmd_to_rq(cmnd)->tag);
2003 return FAILED;
2004 }
2005 }
2006
2007 /*
2008 * csio_tm_cbfn - TM callback function.
2009 * @hw: HW module.
2010 * @req: IO request.
2011 *
2012 * Cache the result in 'cmnd', since ioreq will be freed soon
2013 * after we return from here, and the waiting thread shouldnt trust
2014 * the ioreq contents.
2015 */
2016 static void
csio_tm_cbfn(struct csio_hw * hw,struct csio_ioreq * req)2017 csio_tm_cbfn(struct csio_hw *hw, struct csio_ioreq *req)
2018 {
2019 struct scsi_cmnd *cmnd = (struct scsi_cmnd *)csio_scsi_cmnd(req);
2020 struct csio_dma_buf *dma_buf;
2021 uint8_t flags = 0;
2022 struct fcp_resp_with_ext *fcp_resp;
2023 struct fcp_resp_rsp_info *rsp_info;
2024
2025 csio_dbg(hw, "req: %p in csio_tm_cbfn status: %d\n",
2026 req, req->wr_status);
2027
2028 /* Cache FW return status */
2029 csio_priv(cmnd)->wr_status = req->wr_status;
2030
2031 /* Special handling based on FCP response */
2032
2033 /*
2034 * FW returns us this error, if flags were set. FCP4 says
2035 * FCP_RSP_LEN_VAL in flags shall be set for TM completions.
2036 * So if a target were to set this bit, we expect that the
2037 * rsp_code is set to FCP_TMF_CMPL for a successful TM
2038 * completion. Any other rsp_code means TM operation failed.
2039 * If a target were to just ignore setting flags, we treat
2040 * the TM operation as success, and FW returns FW_SUCCESS.
2041 */
2042 if (req->wr_status == FW_SCSI_RSP_ERR) {
2043 dma_buf = &req->dma_buf;
2044 fcp_resp = (struct fcp_resp_with_ext *)dma_buf->vaddr;
2045 rsp_info = (struct fcp_resp_rsp_info *)(fcp_resp + 1);
2046
2047 flags = fcp_resp->resp.fr_flags;
2048
2049 /* Modify return status if flags indicate success */
2050 if (flags & FCP_RSP_LEN_VAL)
2051 if (rsp_info->rsp_code == FCP_TMF_CMPL)
2052 csio_priv(cmnd)->wr_status = FW_SUCCESS;
2053
2054 csio_dbg(hw, "TM FCP rsp code: %d\n", rsp_info->rsp_code);
2055 }
2056
2057 /* Wake up the TM handler thread */
2058 csio_scsi_cmnd(req) = NULL;
2059 }
2060
2061 static int
csio_eh_lun_reset_handler(struct scsi_cmnd * cmnd)2062 csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
2063 {
2064 struct csio_lnode *ln = shost_priv(cmnd->device->host);
2065 struct csio_hw *hw = csio_lnode_to_hw(ln);
2066 struct csio_scsim *scsim = csio_hw_to_scsim(hw);
2067 struct csio_rnode *rn = (struct csio_rnode *)(cmnd->device->hostdata);
2068 struct csio_ioreq *ioreq = NULL;
2069 struct csio_scsi_qset *sqset;
2070 unsigned long flags;
2071 int retval;
2072 int count, ret;
2073 LIST_HEAD(local_q);
2074 struct csio_scsi_level_data sld;
2075
2076 if (!rn)
2077 goto fail;
2078
2079 csio_dbg(hw, "Request to reset LUN:%llu (ssni:0x%x tgtid:%d)\n",
2080 cmnd->device->lun, rn->flowid, rn->scsi_id);
2081
2082 if (!csio_is_lnode_ready(ln)) {
2083 csio_err(hw,
2084 "LUN reset cannot be issued on non-ready"
2085 " local node vnpi:0x%x (LUN:%llu)\n",
2086 ln->vnp_flowid, cmnd->device->lun);
2087 goto fail;
2088 }
2089
2090 /* Lnode is ready, now wait on rport node readiness */
2091 ret = fc_block_scsi_eh(cmnd);
2092 if (ret)
2093 return ret;
2094
2095 /*
2096 * If we have blocked in the previous call, at this point, either the
2097 * remote node has come back online, or device loss timer has fired
2098 * and the remote node is destroyed. Allow the LUN reset only for
2099 * the former case, since LUN reset is a TMF I/O on the wire, and we
2100 * need a valid session to issue it.
2101 */
2102 if (fc_remote_port_chkready(rn->rport)) {
2103 csio_err(hw,
2104 "LUN reset cannot be issued on non-ready"
2105 " remote node ssni:0x%x (LUN:%llu)\n",
2106 rn->flowid, cmnd->device->lun);
2107 goto fail;
2108 }
2109
2110 /* Get a free ioreq structure - SM is already set to uninit */
2111 ioreq = csio_get_scsi_ioreq_lock(hw, scsim);
2112
2113 if (!ioreq) {
2114 csio_err(hw, "Out of IO request elements. Active # :%d\n",
2115 scsim->stats.n_active);
2116 goto fail;
2117 }
2118
2119 sqset = &hw->sqset[ln->portid][smp_processor_id()];
2120 ioreq->nsge = 0;
2121 ioreq->lnode = ln;
2122 ioreq->rnode = rn;
2123 ioreq->iq_idx = sqset->iq_idx;
2124 ioreq->eq_idx = sqset->eq_idx;
2125
2126 csio_scsi_cmnd(ioreq) = cmnd;
2127 cmnd->host_scribble = (unsigned char *)ioreq;
2128 csio_priv(cmnd)->wr_status = 0;
2129
2130 csio_priv(cmnd)->fc_tm_flags = FCP_TMF_LUN_RESET;
2131 ioreq->tmo = CSIO_SCSI_LUNRST_TMO_MS / 1000;
2132
2133 /*
2134 * FW times the LUN reset for ioreq->tmo, so we got to wait a little
2135 * longer (10s for now) than that to allow FW to return the timed
2136 * out command.
2137 */
2138 count = DIV_ROUND_UP((ioreq->tmo + 10) * 1000, CSIO_SCSI_TM_POLL_MS);
2139
2140 /* Set cbfn */
2141 ioreq->io_cbfn = csio_tm_cbfn;
2142
2143 /* Save of the ioreq info for later use */
2144 sld.level = CSIO_LEV_LUN;
2145 sld.lnode = ioreq->lnode;
2146 sld.rnode = ioreq->rnode;
2147 sld.oslun = cmnd->device->lun;
2148
2149 spin_lock_irqsave(&hw->lock, flags);
2150 /* Kick off TM SM on the ioreq */
2151 retval = csio_scsi_start_tm(ioreq);
2152 spin_unlock_irqrestore(&hw->lock, flags);
2153
2154 if (retval != 0) {
2155 csio_err(hw, "Failed to issue LUN reset, req:%p, status:%d\n",
2156 ioreq, retval);
2157 goto fail_ret_ioreq;
2158 }
2159
2160 csio_dbg(hw, "Waiting max %d secs for LUN reset completion\n",
2161 count * (CSIO_SCSI_TM_POLL_MS / 1000));
2162 /* Wait for completion */
2163 while ((((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == cmnd)
2164 && count--)
2165 msleep(CSIO_SCSI_TM_POLL_MS);
2166
2167 /* LUN reset timed-out */
2168 if (((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == cmnd) {
2169 csio_err(hw, "LUN reset (%d:%llu) timed out\n",
2170 cmnd->device->id, cmnd->device->lun);
2171
2172 spin_lock_irq(&hw->lock);
2173 csio_scsi_drvcleanup(ioreq);
2174 list_del_init(&ioreq->sm.sm_list);
2175 spin_unlock_irq(&hw->lock);
2176
2177 goto fail_ret_ioreq;
2178 }
2179
2180 /* LUN reset returned, check cached status */
2181 if (csio_priv(cmnd)->wr_status != FW_SUCCESS) {
2182 csio_err(hw, "LUN reset failed (%d:%llu), status: %d\n",
2183 cmnd->device->id, cmnd->device->lun,
2184 csio_priv(cmnd)->wr_status);
2185 goto fail;
2186 }
2187
2188 /* LUN reset succeeded, Start aborting affected I/Os */
2189 /*
2190 * Since the host guarantees during LUN reset that there
2191 * will not be any more I/Os to that LUN, until the LUN reset
2192 * completes, we gather pending I/Os after the LUN reset.
2193 */
2194 spin_lock_irq(&hw->lock);
2195 csio_scsi_gather_active_ios(scsim, &sld, &local_q);
2196
2197 retval = csio_scsi_abort_io_q(scsim, &local_q, 30000);
2198 spin_unlock_irq(&hw->lock);
2199
2200 /* Aborts may have timed out */
2201 if (retval != 0) {
2202 csio_err(hw,
2203 "Attempt to abort I/Os during LUN reset of %llu"
2204 " returned %d\n", cmnd->device->lun, retval);
2205 /* Return I/Os back to active_q */
2206 spin_lock_irq(&hw->lock);
2207 list_splice_tail_init(&local_q, &scsim->active_q);
2208 spin_unlock_irq(&hw->lock);
2209 goto fail;
2210 }
2211
2212 CSIO_INC_STATS(rn, n_lun_rst);
2213
2214 csio_info(hw, "LUN reset occurred (%d:%llu)\n",
2215 cmnd->device->id, cmnd->device->lun);
2216
2217 return SUCCESS;
2218
2219 fail_ret_ioreq:
2220 csio_put_scsi_ioreq_lock(hw, scsim, ioreq);
2221 fail:
2222 CSIO_INC_STATS(rn, n_lun_rst_fail);
2223 return FAILED;
2224 }
2225
2226 static int
csio_slave_alloc(struct scsi_device * sdev)2227 csio_slave_alloc(struct scsi_device *sdev)
2228 {
2229 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2230
2231 if (!rport || fc_remote_port_chkready(rport))
2232 return -ENXIO;
2233
2234 sdev->hostdata = *((struct csio_lnode **)(rport->dd_data));
2235
2236 return 0;
2237 }
2238
2239 static int
csio_slave_configure(struct scsi_device * sdev)2240 csio_slave_configure(struct scsi_device *sdev)
2241 {
2242 scsi_change_queue_depth(sdev, csio_lun_qdepth);
2243 return 0;
2244 }
2245
2246 static void
csio_slave_destroy(struct scsi_device * sdev)2247 csio_slave_destroy(struct scsi_device *sdev)
2248 {
2249 sdev->hostdata = NULL;
2250 }
2251
2252 static int
csio_scan_finished(struct Scsi_Host * shost,unsigned long time)2253 csio_scan_finished(struct Scsi_Host *shost, unsigned long time)
2254 {
2255 struct csio_lnode *ln = shost_priv(shost);
2256 int rv = 1;
2257
2258 spin_lock_irq(shost->host_lock);
2259 if (!ln->hwp || csio_list_deleted(&ln->sm.sm_list))
2260 goto out;
2261
2262 rv = csio_scan_done(ln, jiffies, time, csio_max_scan_tmo * HZ,
2263 csio_delta_scan_tmo * HZ);
2264 out:
2265 spin_unlock_irq(shost->host_lock);
2266
2267 return rv;
2268 }
2269
2270 struct scsi_host_template csio_fcoe_shost_template = {
2271 .module = THIS_MODULE,
2272 .name = CSIO_DRV_DESC,
2273 .proc_name = KBUILD_MODNAME,
2274 .queuecommand = csio_queuecommand,
2275 .cmd_size = sizeof(struct csio_cmd_priv),
2276 .eh_timed_out = fc_eh_timed_out,
2277 .eh_abort_handler = csio_eh_abort_handler,
2278 .eh_device_reset_handler = csio_eh_lun_reset_handler,
2279 .slave_alloc = csio_slave_alloc,
2280 .slave_configure = csio_slave_configure,
2281 .slave_destroy = csio_slave_destroy,
2282 .scan_finished = csio_scan_finished,
2283 .this_id = -1,
2284 .sg_tablesize = CSIO_SCSI_MAX_SGE,
2285 .cmd_per_lun = CSIO_MAX_CMD_PER_LUN,
2286 .shost_groups = csio_fcoe_lport_groups,
2287 .max_sectors = CSIO_MAX_SECTOR_SIZE,
2288 };
2289
2290 struct scsi_host_template csio_fcoe_shost_vport_template = {
2291 .module = THIS_MODULE,
2292 .name = CSIO_DRV_DESC,
2293 .proc_name = KBUILD_MODNAME,
2294 .queuecommand = csio_queuecommand,
2295 .eh_timed_out = fc_eh_timed_out,
2296 .eh_abort_handler = csio_eh_abort_handler,
2297 .eh_device_reset_handler = csio_eh_lun_reset_handler,
2298 .slave_alloc = csio_slave_alloc,
2299 .slave_configure = csio_slave_configure,
2300 .slave_destroy = csio_slave_destroy,
2301 .scan_finished = csio_scan_finished,
2302 .this_id = -1,
2303 .sg_tablesize = CSIO_SCSI_MAX_SGE,
2304 .cmd_per_lun = CSIO_MAX_CMD_PER_LUN,
2305 .shost_groups = csio_fcoe_vport_groups,
2306 .max_sectors = CSIO_MAX_SECTOR_SIZE,
2307 };
2308
2309 /*
2310 * csio_scsi_alloc_ddp_bufs - Allocate buffers for DDP of unaligned SGLs.
2311 * @scm: SCSI Module
2312 * @hw: HW device.
2313 * @buf_size: buffer size
2314 * @num_buf : Number of buffers.
2315 *
2316 * This routine allocates DMA buffers required for SCSI Data xfer, if
2317 * each SGL buffer for a SCSI Read request posted by SCSI midlayer are
2318 * not virtually contiguous.
2319 */
2320 static int
csio_scsi_alloc_ddp_bufs(struct csio_scsim * scm,struct csio_hw * hw,int buf_size,int num_buf)2321 csio_scsi_alloc_ddp_bufs(struct csio_scsim *scm, struct csio_hw *hw,
2322 int buf_size, int num_buf)
2323 {
2324 int n = 0;
2325 struct list_head *tmp;
2326 struct csio_dma_buf *ddp_desc = NULL;
2327 uint32_t unit_size = 0;
2328
2329 if (!num_buf)
2330 return 0;
2331
2332 if (!buf_size)
2333 return -EINVAL;
2334
2335 INIT_LIST_HEAD(&scm->ddp_freelist);
2336
2337 /* Align buf size to page size */
2338 buf_size = (buf_size + PAGE_SIZE - 1) & PAGE_MASK;
2339 /* Initialize dma descriptors */
2340 for (n = 0; n < num_buf; n++) {
2341 /* Set unit size to request size */
2342 unit_size = buf_size;
2343 ddp_desc = kzalloc(sizeof(struct csio_dma_buf), GFP_KERNEL);
2344 if (!ddp_desc) {
2345 csio_err(hw,
2346 "Failed to allocate ddp descriptors,"
2347 " Num allocated = %d.\n",
2348 scm->stats.n_free_ddp);
2349 goto no_mem;
2350 }
2351
2352 /* Allocate Dma buffers for DDP */
2353 ddp_desc->vaddr = dma_alloc_coherent(&hw->pdev->dev, unit_size,
2354 &ddp_desc->paddr, GFP_KERNEL);
2355 if (!ddp_desc->vaddr) {
2356 csio_err(hw,
2357 "SCSI response DMA buffer (ddp) allocation"
2358 " failed!\n");
2359 kfree(ddp_desc);
2360 goto no_mem;
2361 }
2362
2363 ddp_desc->len = unit_size;
2364
2365 /* Added it to scsi ddp freelist */
2366 list_add_tail(&ddp_desc->list, &scm->ddp_freelist);
2367 CSIO_INC_STATS(scm, n_free_ddp);
2368 }
2369
2370 return 0;
2371 no_mem:
2372 /* release dma descs back to freelist and free dma memory */
2373 list_for_each(tmp, &scm->ddp_freelist) {
2374 ddp_desc = (struct csio_dma_buf *) tmp;
2375 tmp = csio_list_prev(tmp);
2376 dma_free_coherent(&hw->pdev->dev, ddp_desc->len,
2377 ddp_desc->vaddr, ddp_desc->paddr);
2378 list_del_init(&ddp_desc->list);
2379 kfree(ddp_desc);
2380 }
2381 scm->stats.n_free_ddp = 0;
2382
2383 return -ENOMEM;
2384 }
2385
2386 /*
2387 * csio_scsi_free_ddp_bufs - free DDP buffers of unaligned SGLs.
2388 * @scm: SCSI Module
2389 * @hw: HW device.
2390 *
2391 * This routine frees ddp buffers.
2392 */
2393 static void
csio_scsi_free_ddp_bufs(struct csio_scsim * scm,struct csio_hw * hw)2394 csio_scsi_free_ddp_bufs(struct csio_scsim *scm, struct csio_hw *hw)
2395 {
2396 struct list_head *tmp;
2397 struct csio_dma_buf *ddp_desc;
2398
2399 /* release dma descs back to freelist and free dma memory */
2400 list_for_each(tmp, &scm->ddp_freelist) {
2401 ddp_desc = (struct csio_dma_buf *) tmp;
2402 tmp = csio_list_prev(tmp);
2403 dma_free_coherent(&hw->pdev->dev, ddp_desc->len,
2404 ddp_desc->vaddr, ddp_desc->paddr);
2405 list_del_init(&ddp_desc->list);
2406 kfree(ddp_desc);
2407 }
2408 scm->stats.n_free_ddp = 0;
2409 }
2410
2411 /**
2412 * csio_scsim_init - Initialize SCSI Module
2413 * @scm: SCSI Module
2414 * @hw: HW module
2415 *
2416 */
2417 int
csio_scsim_init(struct csio_scsim * scm,struct csio_hw * hw)2418 csio_scsim_init(struct csio_scsim *scm, struct csio_hw *hw)
2419 {
2420 int i;
2421 struct csio_ioreq *ioreq;
2422 struct csio_dma_buf *dma_buf;
2423
2424 INIT_LIST_HEAD(&scm->active_q);
2425 scm->hw = hw;
2426
2427 scm->proto_cmd_len = sizeof(struct fcp_cmnd);
2428 scm->proto_rsp_len = CSIO_SCSI_RSP_LEN;
2429 scm->max_sge = CSIO_SCSI_MAX_SGE;
2430
2431 spin_lock_init(&scm->freelist_lock);
2432
2433 /* Pre-allocate ioreqs and initialize them */
2434 INIT_LIST_HEAD(&scm->ioreq_freelist);
2435 for (i = 0; i < csio_scsi_ioreqs; i++) {
2436
2437 ioreq = kzalloc(sizeof(struct csio_ioreq), GFP_KERNEL);
2438 if (!ioreq) {
2439 csio_err(hw,
2440 "I/O request element allocation failed, "
2441 " Num allocated = %d.\n",
2442 scm->stats.n_free_ioreq);
2443
2444 goto free_ioreq;
2445 }
2446
2447 /* Allocate Dma buffers for Response Payload */
2448 dma_buf = &ioreq->dma_buf;
2449 dma_buf->vaddr = dma_pool_alloc(hw->scsi_dma_pool, GFP_KERNEL,
2450 &dma_buf->paddr);
2451 if (!dma_buf->vaddr) {
2452 csio_err(hw,
2453 "SCSI response DMA buffer allocation"
2454 " failed!\n");
2455 kfree(ioreq);
2456 goto free_ioreq;
2457 }
2458
2459 dma_buf->len = scm->proto_rsp_len;
2460
2461 /* Set state to uninit */
2462 csio_init_state(&ioreq->sm, csio_scsis_uninit);
2463 INIT_LIST_HEAD(&ioreq->gen_list);
2464 init_completion(&ioreq->cmplobj);
2465
2466 list_add_tail(&ioreq->sm.sm_list, &scm->ioreq_freelist);
2467 CSIO_INC_STATS(scm, n_free_ioreq);
2468 }
2469
2470 if (csio_scsi_alloc_ddp_bufs(scm, hw, PAGE_SIZE, csio_ddp_descs))
2471 goto free_ioreq;
2472
2473 return 0;
2474
2475 free_ioreq:
2476 /*
2477 * Free up existing allocations, since an error
2478 * from here means we are returning for good
2479 */
2480 while (!list_empty(&scm->ioreq_freelist)) {
2481 struct csio_sm *tmp;
2482
2483 tmp = list_first_entry(&scm->ioreq_freelist,
2484 struct csio_sm, sm_list);
2485 list_del_init(&tmp->sm_list);
2486 ioreq = (struct csio_ioreq *)tmp;
2487
2488 dma_buf = &ioreq->dma_buf;
2489 dma_pool_free(hw->scsi_dma_pool, dma_buf->vaddr,
2490 dma_buf->paddr);
2491
2492 kfree(ioreq);
2493 }
2494
2495 scm->stats.n_free_ioreq = 0;
2496
2497 return -ENOMEM;
2498 }
2499
2500 /**
2501 * csio_scsim_exit: Uninitialize SCSI Module
2502 * @scm: SCSI Module
2503 *
2504 */
2505 void
csio_scsim_exit(struct csio_scsim * scm)2506 csio_scsim_exit(struct csio_scsim *scm)
2507 {
2508 struct csio_ioreq *ioreq;
2509 struct csio_dma_buf *dma_buf;
2510
2511 while (!list_empty(&scm->ioreq_freelist)) {
2512 struct csio_sm *tmp;
2513
2514 tmp = list_first_entry(&scm->ioreq_freelist,
2515 struct csio_sm, sm_list);
2516 list_del_init(&tmp->sm_list);
2517 ioreq = (struct csio_ioreq *)tmp;
2518
2519 dma_buf = &ioreq->dma_buf;
2520 dma_pool_free(scm->hw->scsi_dma_pool, dma_buf->vaddr,
2521 dma_buf->paddr);
2522
2523 kfree(ioreq);
2524 }
2525
2526 scm->stats.n_free_ioreq = 0;
2527
2528 csio_scsi_free_ddp_bufs(scm, scm->hw);
2529 }
2530
