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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / target / iscsi / cxgbit / cxgbit_target.c
blobfcdc4211e3c27f2896d0782a9b2693dbeaf9f5d6
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2016 Chelsio Communications, Inc.
4 */
5
6 #include <linux/workqueue.h>
7 #include <linux/kthread.h>
8 #include <linux/sched/signal.h>
9
10 #include <asm/unaligned.h>
11 #include <net/tcp.h>
12 #include <target/target_core_base.h>
13 #include <target/target_core_fabric.h>
14 #include "cxgbit.h"
15
16 struct sge_opaque_hdr {
17 void *dev;
18 dma_addr_t addr[MAX_SKB_FRAGS + 1];
19 };
20
21 static const u8 cxgbit_digest_len[] = {0, 4, 4, 8};
22
23 #define TX_HDR_LEN (sizeof(struct sge_opaque_hdr) + \
24 sizeof(struct fw_ofld_tx_data_wr))
25
26 static struct sk_buff *
27 __cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len, bool iso)
28 {
29 struct sk_buff *skb = NULL;
30 u8 submode = 0;
31 int errcode;
32 static const u32 hdr_len = TX_HDR_LEN + ISCSI_HDR_LEN;
33
34 if (len) {
35 skb = alloc_skb_with_frags(hdr_len, len,
36 0, &errcode,
37 GFP_KERNEL);
38 if (!skb)
39 return NULL;
40
41 skb_reserve(skb, TX_HDR_LEN);
42 skb_reset_transport_header(skb);
43 __skb_put(skb, ISCSI_HDR_LEN);
44 skb->data_len = len;
45 skb->len += len;
46 submode |= (csk->submode & CXGBIT_SUBMODE_DCRC);
47
48 } else {
49 u32 iso_len = iso ? sizeof(struct cpl_tx_data_iso) : 0;
50
51 skb = alloc_skb(hdr_len + iso_len, GFP_KERNEL);
52 if (!skb)
53 return NULL;
54
55 skb_reserve(skb, TX_HDR_LEN + iso_len);
56 skb_reset_transport_header(skb);
57 __skb_put(skb, ISCSI_HDR_LEN);
58 }
59
60 submode |= (csk->submode & CXGBIT_SUBMODE_HCRC);
61 cxgbit_skcb_submode(skb) = submode;
62 cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[submode];
63 cxgbit_skcb_flags(skb) |= SKCBF_TX_NEED_HDR;
64 return skb;
65 }
66
67 static struct sk_buff *cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len)
68 {
69 return __cxgbit_alloc_skb(csk, len, false);
70 }
71
72 /*
73 * cxgbit_is_ofld_imm - check whether a packet can be sent as immediate data
74 * @skb: the packet
75 *
76 * Returns true if a packet can be sent as an offload WR with immediate
77 * data. We currently use the same limit as for Ethernet packets.
78 */
79 static int cxgbit_is_ofld_imm(const struct sk_buff *skb)
80 {
81 int length = skb->len;
82
83 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR))
84 length += sizeof(struct fw_ofld_tx_data_wr);
85
86 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_ISO))
87 length += sizeof(struct cpl_tx_data_iso);
88
89 #define MAX_IMM_TX_PKT_LEN 256
90 return length <= MAX_IMM_TX_PKT_LEN;
91 }
92
93 /*
94 * cxgbit_sgl_len - calculates the size of an SGL of the given capacity
95 * @n: the number of SGL entries
96 * Calculates the number of flits needed for a scatter/gather list that
97 * can hold the given number of entries.
98 */
99 static inline unsigned int cxgbit_sgl_len(unsigned int n)
100 {
101 n--;
102 return (3 * n) / 2 + (n & 1) + 2;
103 }
104
105 /*
106 * cxgbit_calc_tx_flits_ofld - calculate # of flits for an offload packet
107 * @skb: the packet
108 *
109 * Returns the number of flits needed for the given offload packet.
110 * These packets are already fully constructed and no additional headers
111 * will be added.
112 */
113 static unsigned int cxgbit_calc_tx_flits_ofld(const struct sk_buff *skb)
114 {
115 unsigned int flits, cnt;
116
117 if (cxgbit_is_ofld_imm(skb))
118 return DIV_ROUND_UP(skb->len, 8);
119 flits = skb_transport_offset(skb) / 8;
120 cnt = skb_shinfo(skb)->nr_frags;
121 if (skb_tail_pointer(skb) != skb_transport_header(skb))
122 cnt++;
123 return flits + cxgbit_sgl_len(cnt);
124 }
125
126 #define CXGBIT_ISO_FSLICE 0x1
127 #define CXGBIT_ISO_LSLICE 0x2
128 static void
129 cxgbit_cpl_tx_data_iso(struct sk_buff *skb, struct cxgbit_iso_info *iso_info)
130 {
131 struct cpl_tx_data_iso *cpl;
132 unsigned int submode = cxgbit_skcb_submode(skb);
133 unsigned int fslice = !!(iso_info->flags & CXGBIT_ISO_FSLICE);
134 unsigned int lslice = !!(iso_info->flags & CXGBIT_ISO_LSLICE);
135
136 cpl = __skb_push(skb, sizeof(*cpl));
137
138 cpl->op_to_scsi = htonl(CPL_TX_DATA_ISO_OP_V(CPL_TX_DATA_ISO) |
139 CPL_TX_DATA_ISO_FIRST_V(fslice) |
140 CPL_TX_DATA_ISO_LAST_V(lslice) |
141 CPL_TX_DATA_ISO_CPLHDRLEN_V(0) |
142 CPL_TX_DATA_ISO_HDRCRC_V(submode & 1) |
143 CPL_TX_DATA_ISO_PLDCRC_V(((submode >> 1) & 1)) |
144 CPL_TX_DATA_ISO_IMMEDIATE_V(0) |
145 CPL_TX_DATA_ISO_SCSI_V(2));
146
147 cpl->ahs_len = 0;
148 cpl->mpdu = htons(DIV_ROUND_UP(iso_info->mpdu, 4));
149 cpl->burst_size = htonl(DIV_ROUND_UP(iso_info->burst_len, 4));
150 cpl->len = htonl(iso_info->len);
151 cpl->reserved2_seglen_offset = htonl(0);
152 cpl->datasn_offset = htonl(0);
153 cpl->buffer_offset = htonl(0);
154 cpl->reserved3 = 0;
155
156 __skb_pull(skb, sizeof(*cpl));
157 }
158
159 static void
160 cxgbit_tx_data_wr(struct cxgbit_sock *csk, struct sk_buff *skb, u32 dlen,
161 u32 len, u32 credits, u32 compl)
162 {
163 struct fw_ofld_tx_data_wr *req;
164 const struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
165 u32 submode = cxgbit_skcb_submode(skb);
166 u32 wr_ulp_mode = 0;
167 u32 hdr_size = sizeof(*req);
168 u32 opcode = FW_OFLD_TX_DATA_WR;
169 u32 immlen = 0;
170 u32 force = is_t5(lldi->adapter_type) ? TX_FORCE_V(!submode) :
171 T6_TX_FORCE_F;
172
173 if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO) {
174 opcode = FW_ISCSI_TX_DATA_WR;
175 immlen += sizeof(struct cpl_tx_data_iso);
176 hdr_size += sizeof(struct cpl_tx_data_iso);
177 submode |= 8;
178 }
179
180 if (cxgbit_is_ofld_imm(skb))
181 immlen += dlen;
182
183 req = __skb_push(skb, hdr_size);
184 req->op_to_immdlen = cpu_to_be32(FW_WR_OP_V(opcode) |
185 FW_WR_COMPL_V(compl) |
186 FW_WR_IMMDLEN_V(immlen));
187 req->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(csk->tid) |
188 FW_WR_LEN16_V(credits));
189 req->plen = htonl(len);
190 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP_MODE_ISCSI) |
191 FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
192
193 req->tunnel_to_proxy = htonl((wr_ulp_mode) | force |
194 FW_OFLD_TX_DATA_WR_SHOVE_V(skb_peek(&csk->txq) ? 0 : 1));
195 }
196
197 static void cxgbit_arp_failure_skb_discard(void *handle, struct sk_buff *skb)
198 {
199 kfree_skb(skb);
200 }
201
202 void cxgbit_push_tx_frames(struct cxgbit_sock *csk)
203 {
204 struct sk_buff *skb;
205
206 while (csk->wr_cred && ((skb = skb_peek(&csk->txq)) != NULL)) {
207 u32 dlen = skb->len;
208 u32 len = skb->len;
209 u32 credits_needed;
210 u32 compl = 0;
211 u32 flowclen16 = 0;
212 u32 iso_cpl_len = 0;
213
214 if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO)
215 iso_cpl_len = sizeof(struct cpl_tx_data_iso);
216
217 if (cxgbit_is_ofld_imm(skb))
218 credits_needed = DIV_ROUND_UP(dlen + iso_cpl_len, 16);
219 else
220 credits_needed = DIV_ROUND_UP((8 *
221 cxgbit_calc_tx_flits_ofld(skb)) +
222 iso_cpl_len, 16);
223
224 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR))
225 credits_needed += DIV_ROUND_UP(
226 sizeof(struct fw_ofld_tx_data_wr), 16);
227 /*
228 * Assumes the initial credits is large enough to support
229 * fw_flowc_wr plus largest possible first payload
230 */
231
232 if (!test_and_set_bit(CSK_TX_DATA_SENT, &csk->com.flags)) {
233 flowclen16 = cxgbit_send_tx_flowc_wr(csk);
234 csk->wr_cred -= flowclen16;
235 csk->wr_una_cred += flowclen16;
236 }
237
238 if (csk->wr_cred < credits_needed) {
239 pr_debug("csk 0x%p, skb %u/%u, wr %d < %u.\n",
240 csk, skb->len, skb->data_len,
241 credits_needed, csk->wr_cred);
242 break;
243 }
244 __skb_unlink(skb, &csk->txq);
245 set_wr_txq(skb, CPL_PRIORITY_DATA, csk->txq_idx);
246 skb->csum = (__force __wsum)(credits_needed + flowclen16);
247 csk->wr_cred -= credits_needed;
248 csk->wr_una_cred += credits_needed;
249
250 pr_debug("csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
251 csk, skb->len, skb->data_len, credits_needed,
252 csk->wr_cred, csk->wr_una_cred);
253
254 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR)) {
255 len += cxgbit_skcb_tx_extralen(skb);
256
257 if ((csk->wr_una_cred >= (csk->wr_max_cred / 2)) ||
258 (!before(csk->write_seq,
259 csk->snd_una + csk->snd_win))) {
260 compl = 1;
261 csk->wr_una_cred = 0;
262 }
263
264 cxgbit_tx_data_wr(csk, skb, dlen, len, credits_needed,
265 compl);
266 csk->snd_nxt += len;
267
268 } else if ((cxgbit_skcb_flags(skb) & SKCBF_TX_FLAG_COMPL) ||
269 (csk->wr_una_cred >= (csk->wr_max_cred / 2))) {
270 struct cpl_close_con_req *req =
271 (struct cpl_close_con_req *)skb->data;
272 req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
273 csk->wr_una_cred = 0;
274 }
275
276 cxgbit_sock_enqueue_wr(csk, skb);
277 t4_set_arp_err_handler(skb, csk,
278 cxgbit_arp_failure_skb_discard);
279
280 pr_debug("csk 0x%p,%u, skb 0x%p, %u.\n",
281 csk, csk->tid, skb, len);
282
283 cxgbit_l2t_send(csk->com.cdev, skb, csk->l2t);
284 }
285 }
286
287 static bool cxgbit_lock_sock(struct cxgbit_sock *csk)
288 {
289 spin_lock_bh(&csk->lock);
290
291 if (before(csk->write_seq, csk->snd_una + csk->snd_win))
292 csk->lock_owner = true;
293
294 spin_unlock_bh(&csk->lock);
295
296 return csk->lock_owner;
297 }
298
299 static void cxgbit_unlock_sock(struct cxgbit_sock *csk)
300 {
301 struct sk_buff_head backlogq;
302 struct sk_buff *skb;
303 void (*fn)(struct cxgbit_sock *, struct sk_buff *);
304
305 skb_queue_head_init(&backlogq);
306
307 spin_lock_bh(&csk->lock);
308 while (skb_queue_len(&csk->backlogq)) {
309 skb_queue_splice_init(&csk->backlogq, &backlogq);
310 spin_unlock_bh(&csk->lock);
311
312 while ((skb = __skb_dequeue(&backlogq))) {
313 fn = cxgbit_skcb_rx_backlog_fn(skb);
314 fn(csk, skb);
315 }
316
317 spin_lock_bh(&csk->lock);
318 }
319
320 csk->lock_owner = false;
321 spin_unlock_bh(&csk->lock);
322 }
323
324 static int cxgbit_queue_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
325 {
326 int ret = 0;
327
328 wait_event_interruptible(csk->ack_waitq, cxgbit_lock_sock(csk));
329
330 if (unlikely((csk->com.state != CSK_STATE_ESTABLISHED) ||
331 signal_pending(current))) {
332 __kfree_skb(skb);
333 __skb_queue_purge(&csk->ppodq);
334 ret = -1;
335 spin_lock_bh(&csk->lock);
336 if (csk->lock_owner) {
337 spin_unlock_bh(&csk->lock);
338 goto unlock;
339 }
340 spin_unlock_bh(&csk->lock);
341 return ret;
342 }
343
344 csk->write_seq += skb->len +
345 cxgbit_skcb_tx_extralen(skb);
346
347 skb_queue_splice_tail_init(&csk->ppodq, &csk->txq);
348 __skb_queue_tail(&csk->txq, skb);
349 cxgbit_push_tx_frames(csk);
350
351 unlock:
352 cxgbit_unlock_sock(csk);
353 return ret;
354 }
355
356 static int
357 cxgbit_map_skb(struct iscsi_cmd *cmd, struct sk_buff *skb, u32 data_offset,
358 u32 data_length)
359 {
360 u32 i = 0, nr_frags = MAX_SKB_FRAGS;
361 u32 padding = ((-data_length) & 3);
362 struct scatterlist *sg;
363 struct page *page;
364 unsigned int page_off;
365
366 if (padding)
367 nr_frags--;
368
369 /*
370 * We know each entry in t_data_sg contains a page.
371 */
372 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
373 page_off = (data_offset % PAGE_SIZE);
374
375 while (data_length && (i < nr_frags)) {
376 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
377
378 page = sg_page(sg);
379
380 get_page(page);
381 skb_fill_page_desc(skb, i, page, sg->offset + page_off,
382 cur_len);
383 skb->data_len += cur_len;
384 skb->len += cur_len;
385 skb->truesize += cur_len;
386
387 data_length -= cur_len;
388 page_off = 0;
389 sg = sg_next(sg);
390 i++;
391 }
392
393 if (data_length)
394 return -1;
395
396 if (padding) {
397 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
398 if (!page)
399 return -1;
400 skb_fill_page_desc(skb, i, page, 0, padding);
401 skb->data_len += padding;
402 skb->len += padding;
403 skb->truesize += padding;
404 }
405
406 return 0;
407 }
408
409 static int
410 cxgbit_tx_datain_iso(struct cxgbit_sock *csk, struct iscsi_cmd *cmd,
411 struct iscsi_datain_req *dr)
412 {
413 struct iscsi_conn *conn = csk->conn;
414 struct sk_buff *skb;
415 struct iscsi_datain datain;
416 struct cxgbit_iso_info iso_info;
417 u32 data_length = cmd->se_cmd.data_length;
418 u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength;
419 u32 num_pdu, plen, tx_data = 0;
420 bool task_sense = !!(cmd->se_cmd.se_cmd_flags &
421 SCF_TRANSPORT_TASK_SENSE);
422 bool set_statsn = false;
423 int ret = -1;
424
425 while (data_length) {
426 num_pdu = (data_length + mrdsl - 1) / mrdsl;
427 if (num_pdu > csk->max_iso_npdu)
428 num_pdu = csk->max_iso_npdu;
429
430 plen = num_pdu * mrdsl;
431 if (plen > data_length)
432 plen = data_length;
433
434 skb = __cxgbit_alloc_skb(csk, 0, true);
435 if (unlikely(!skb))
436 return -ENOMEM;
437
438 memset(skb->data, 0, ISCSI_HDR_LEN);
439 cxgbit_skcb_flags(skb) |= SKCBF_TX_ISO;
440 cxgbit_skcb_submode(skb) |= (csk->submode &
441 CXGBIT_SUBMODE_DCRC);
442 cxgbit_skcb_tx_extralen(skb) = (num_pdu *
443 cxgbit_digest_len[cxgbit_skcb_submode(skb)]) +
444 ((num_pdu - 1) * ISCSI_HDR_LEN);
445
446 memset(&datain, 0, sizeof(struct iscsi_datain));
447 memset(&iso_info, 0, sizeof(iso_info));
448
449 if (!tx_data)
450 iso_info.flags |= CXGBIT_ISO_FSLICE;
451
452 if (!(data_length - plen)) {
453 iso_info.flags |= CXGBIT_ISO_LSLICE;
454 if (!task_sense) {
455 datain.flags = ISCSI_FLAG_DATA_STATUS;
456 iscsit_increment_maxcmdsn(cmd, conn->sess);
457 cmd->stat_sn = conn->stat_sn++;
458 set_statsn = true;
459 }
460 }
461
462 iso_info.burst_len = num_pdu * mrdsl;
463 iso_info.mpdu = mrdsl;
464 iso_info.len = ISCSI_HDR_LEN + plen;
465
466 cxgbit_cpl_tx_data_iso(skb, &iso_info);
467
468 datain.offset = tx_data;
469 datain.data_sn = cmd->data_sn - 1;
470
471 iscsit_build_datain_pdu(cmd, conn, &datain,
472 (struct iscsi_data_rsp *)skb->data,
473 set_statsn);
474
475 ret = cxgbit_map_skb(cmd, skb, tx_data, plen);
476 if (unlikely(ret)) {
477 __kfree_skb(skb);
478 goto out;
479 }
480
481 ret = cxgbit_queue_skb(csk, skb);
482 if (unlikely(ret))
483 goto out;
484
485 tx_data += plen;
486 data_length -= plen;
487
488 cmd->read_data_done += plen;
489 cmd->data_sn += num_pdu;
490 }
491
492 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
493
494 return 0;
495
496 out:
497 return ret;
498 }
499
500 static int
501 cxgbit_tx_datain(struct cxgbit_sock *csk, struct iscsi_cmd *cmd,
502 const struct iscsi_datain *datain)
503 {
504 struct sk_buff *skb;
505 int ret = 0;
506
507 skb = cxgbit_alloc_skb(csk, 0);
508 if (unlikely(!skb))
509 return -ENOMEM;
510
511 memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN);
512
513 if (datain->length) {
514 cxgbit_skcb_submode(skb) |= (csk->submode &
515 CXGBIT_SUBMODE_DCRC);
516 cxgbit_skcb_tx_extralen(skb) =
517 cxgbit_digest_len[cxgbit_skcb_submode(skb)];
518 }
519
520 ret = cxgbit_map_skb(cmd, skb, datain->offset, datain->length);
521 if (ret < 0) {
522 __kfree_skb(skb);
523 return ret;
524 }
525
526 return cxgbit_queue_skb(csk, skb);
527 }
528
529 static int
530 cxgbit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
531 struct iscsi_datain_req *dr,
532 const struct iscsi_datain *datain)
533 {
534 struct cxgbit_sock *csk = conn->context;
535 u32 data_length = cmd->se_cmd.data_length;
536 u32 padding = ((-data_length) & 3);
537 u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength;
538
539 if ((data_length > mrdsl) && (!dr->recovery) &&
540 (!padding) && (!datain->offset) && csk->max_iso_npdu) {
541 atomic_long_add(data_length - datain->length,
542 &conn->sess->tx_data_octets);
543 return cxgbit_tx_datain_iso(csk, cmd, dr);
544 }
545
546 return cxgbit_tx_datain(csk, cmd, datain);
547 }
548
549 static int
550 cxgbit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
551 const void *data_buf, u32 data_buf_len)
552 {
553 struct cxgbit_sock *csk = conn->context;
554 struct sk_buff *skb;
555 u32 padding = ((-data_buf_len) & 3);
556
557 skb = cxgbit_alloc_skb(csk, data_buf_len + padding);
558 if (unlikely(!skb))
559 return -ENOMEM;
560
561 memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN);
562
563 if (data_buf_len) {
564 u32 pad_bytes = 0;
565
566 skb_store_bits(skb, ISCSI_HDR_LEN, data_buf, data_buf_len);
567
568 if (padding)
569 skb_store_bits(skb, ISCSI_HDR_LEN + data_buf_len,
570 &pad_bytes, padding);
571 }
572
573 cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[
574 cxgbit_skcb_submode(skb)];
575
576 return cxgbit_queue_skb(csk, skb);
577 }
578
579 int
580 cxgbit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
581 struct iscsi_datain_req *dr, const void *buf, u32 buf_len)
582 {
583 if (dr)
584 return cxgbit_xmit_datain_pdu(conn, cmd, dr, buf);
585 else
586 return cxgbit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
587 }
588
589 int cxgbit_validate_params(struct iscsi_conn *conn)
590 {
591 struct cxgbit_sock *csk = conn->context;
592 struct cxgbit_device *cdev = csk->com.cdev;
593 struct iscsi_param *param;
594 u32 max_xmitdsl;
595
596 param = iscsi_find_param_from_key(MAXXMITDATASEGMENTLENGTH,
597 conn->param_list);
598 if (!param)
599 return -1;
600
601 if (kstrtou32(param->value, 0, &max_xmitdsl) < 0)
602 return -1;
603
604 if (max_xmitdsl > cdev->mdsl) {
605 if (iscsi_change_param_sprintf(
606 conn, "MaxXmitDataSegmentLength=%u", cdev->mdsl))
607 return -1;
608 }
609
610 return 0;
611 }
612
613 static int cxgbit_set_digest(struct cxgbit_sock *csk)
614 {
615 struct iscsi_conn *conn = csk->conn;
616 struct iscsi_param *param;
617
618 param = iscsi_find_param_from_key(HEADERDIGEST, conn->param_list);
619 if (!param) {
620 pr_err("param not found key %s\n", HEADERDIGEST);
621 return -1;
622 }
623
624 if (!strcmp(param->value, CRC32C))
625 csk->submode |= CXGBIT_SUBMODE_HCRC;
626
627 param = iscsi_find_param_from_key(DATADIGEST, conn->param_list);
628 if (!param) {
629 csk->submode = 0;
630 pr_err("param not found key %s\n", DATADIGEST);
631 return -1;
632 }
633
634 if (!strcmp(param->value, CRC32C))
635 csk->submode |= CXGBIT_SUBMODE_DCRC;
636
637 if (cxgbit_setup_conn_digest(csk)) {
638 csk->submode = 0;
639 return -1;
640 }
641
642 return 0;
643 }
644
645 static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk)
646 {
647 struct iscsi_conn *conn = csk->conn;
648 struct iscsi_conn_ops *conn_ops = conn->conn_ops;
649 struct iscsi_param *param;
650 u32 mrdsl, mbl;
651 u32 max_npdu, max_iso_npdu;
652 u32 max_iso_payload;
653
654 if (conn->login->leading_connection) {
655 param = iscsi_find_param_from_key(MAXBURSTLENGTH,
656 conn->param_list);
657 if (!param) {
658 pr_err("param not found key %s\n", MAXBURSTLENGTH);
659 return -1;
660 }
661
662 if (kstrtou32(param->value, 0, &mbl) < 0)
663 return -1;
664 } else {
665 mbl = conn->sess->sess_ops->MaxBurstLength;
666 }
667
668 mrdsl = conn_ops->MaxRecvDataSegmentLength;
669 max_npdu = mbl / mrdsl;
670
671 max_iso_payload = rounddown(CXGBIT_MAX_ISO_PAYLOAD, csk->emss);
672
673 max_iso_npdu = max_iso_payload /
674 (ISCSI_HDR_LEN + mrdsl +
675 cxgbit_digest_len[csk->submode]);
676
677 csk->max_iso_npdu = min(max_npdu, max_iso_npdu);
678
679 if (csk->max_iso_npdu <= 1)
680 csk->max_iso_npdu = 0;
681
682 return 0;
683 }
684
685 /*
686 * cxgbit_seq_pdu_inorder()
687 * @csk: pointer to cxgbit socket structure
688 *
689 * This function checks whether data sequence and data
690 * pdu are in order.
691 *
692 * Return: returns -1 on error, 0 if data sequence and
693 * data pdu are in order, 1 if data sequence or data pdu
694 * is not in order.
695 */
696 static int cxgbit_seq_pdu_inorder(struct cxgbit_sock *csk)
697 {
698 struct iscsi_conn *conn = csk->conn;
699 struct iscsi_param *param;
700
701 if (conn->login->leading_connection) {
702 param = iscsi_find_param_from_key(DATASEQUENCEINORDER,
703 conn->param_list);
704 if (!param) {
705 pr_err("param not found key %s\n", DATASEQUENCEINORDER);
706 return -1;
707 }
708
709 if (strcmp(param->value, YES))
710 return 1;
711
712 param = iscsi_find_param_from_key(DATAPDUINORDER,
713 conn->param_list);
714 if (!param) {
715 pr_err("param not found key %s\n", DATAPDUINORDER);
716 return -1;
717 }
718
719 if (strcmp(param->value, YES))
720 return 1;
721
722 } else {
723 if (!conn->sess->sess_ops->DataSequenceInOrder)
724 return 1;
725 if (!conn->sess->sess_ops->DataPDUInOrder)
726 return 1;
727 }
728
729 return 0;
730 }
731
732 static int cxgbit_set_params(struct iscsi_conn *conn)
733 {
734 struct cxgbit_sock *csk = conn->context;
735 struct cxgbit_device *cdev = csk->com.cdev;
736 struct cxgbi_ppm *ppm = *csk->com.cdev->lldi.iscsi_ppm;
737 struct iscsi_conn_ops *conn_ops = conn->conn_ops;
738 struct iscsi_param *param;
739 u8 erl;
740
741 if (conn_ops->MaxRecvDataSegmentLength > cdev->mdsl)
742 conn_ops->MaxRecvDataSegmentLength = cdev->mdsl;
743
744 if (cxgbit_set_digest(csk))
745 return -1;
746
747 if (conn->login->leading_connection) {
748 param = iscsi_find_param_from_key(ERRORRECOVERYLEVEL,
749 conn->param_list);
750 if (!param) {
751 pr_err("param not found key %s\n", ERRORRECOVERYLEVEL);
752 return -1;
753 }
754 if (kstrtou8(param->value, 0, &erl) < 0)
755 return -1;
756 } else {
757 erl = conn->sess->sess_ops->ErrorRecoveryLevel;
758 }
759
760 if (!erl) {
761 int ret;
762
763 ret = cxgbit_seq_pdu_inorder(csk);
764 if (ret < 0) {
765 return -1;
766 } else if (ret > 0) {
767 if (is_t5(cdev->lldi.adapter_type))
768 goto enable_ddp;
769 else
770 return 0;
771 }
772
773 if (test_bit(CDEV_ISO_ENABLE, &cdev->flags)) {
774 if (cxgbit_set_iso_npdu(csk))
775 return -1;
776 }
777
778 enable_ddp:
779 if (test_bit(CDEV_DDP_ENABLE, &cdev->flags)) {
780 if (cxgbit_setup_conn_pgidx(csk,
781 ppm->tformat.pgsz_idx_dflt))
782 return -1;
783 set_bit(CSK_DDP_ENABLE, &csk->com.flags);
784 }
785 }
786
787 return 0;
788 }
789
790 int
791 cxgbit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
792 u32 length)
793 {
794 struct cxgbit_sock *csk = conn->context;
795 struct sk_buff *skb;
796 u32 padding_buf = 0;
797 u8 padding = ((-length) & 3);
798
799 skb = cxgbit_alloc_skb(csk, length + padding);
800 if (!skb)
801 return -ENOMEM;
802 skb_store_bits(skb, 0, login->rsp, ISCSI_HDR_LEN);
803 skb_store_bits(skb, ISCSI_HDR_LEN, login->rsp_buf, length);
804
805 if (padding)
806 skb_store_bits(skb, ISCSI_HDR_LEN + length,
807 &padding_buf, padding);
808
809 if (login->login_complete) {
810 if (cxgbit_set_params(conn)) {
811 kfree_skb(skb);
812 return -1;
813 }
814
815 set_bit(CSK_LOGIN_DONE, &csk->com.flags);
816 }
817
818 if (cxgbit_queue_skb(csk, skb))
819 return -1;
820
821 if ((!login->login_complete) && (!login->login_failed))
822 schedule_delayed_work(&conn->login_work, 0);
823
824 return 0;
825 }
826
827 static void
828 cxgbit_skb_copy_to_sg(struct sk_buff *skb, struct scatterlist *sg,
829 unsigned int nents, u32 skip)
830 {
831 struct skb_seq_state st;
832 const u8 *buf;
833 unsigned int consumed = 0, buf_len;
834 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(skb);
835
836 skb_prepare_seq_read(skb, pdu_cb->doffset,
837 pdu_cb->doffset + pdu_cb->dlen,
838 &st);
839
840 while (true) {
841 buf_len = skb_seq_read(consumed, &buf, &st);
842 if (!buf_len) {
843 skb_abort_seq_read(&st);
844 break;
845 }
846
847 consumed += sg_pcopy_from_buffer(sg, nents, (void *)buf,
848 buf_len, skip + consumed);
849 }
850 }
851
852 static struct iscsi_cmd *cxgbit_allocate_cmd(struct cxgbit_sock *csk)
853 {
854 struct iscsi_conn *conn = csk->conn;
855 struct cxgbi_ppm *ppm = cdev2ppm(csk->com.cdev);
856 struct cxgbit_cmd *ccmd;
857 struct iscsi_cmd *cmd;
858
859 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
860 if (!cmd) {
861 pr_err("Unable to allocate iscsi_cmd + cxgbit_cmd\n");
862 return NULL;
863 }
864
865 ccmd = iscsit_priv_cmd(cmd);
866 ccmd->ttinfo.tag = ppm->tformat.no_ddp_mask;
867 ccmd->setup_ddp = true;
868
869 return cmd;
870 }
871
872 static int
873 cxgbit_handle_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
874 u32 length)
875 {
876 struct iscsi_conn *conn = cmd->conn;
877 struct cxgbit_sock *csk = conn->context;
878 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
879
880 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
881 pr_err("ImmediateData CRC32C DataDigest error\n");
882 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
883 pr_err("Unable to recover from"
884 " Immediate Data digest failure while"
885 " in ERL=0.\n");
886 iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
887 (unsigned char *)hdr);
888 return IMMEDIATE_DATA_CANNOT_RECOVER;
889 }
890
891 iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
892 (unsigned char *)hdr);
893 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
894 }
895
896 if (cmd->se_cmd.se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
897 struct cxgbit_cmd *ccmd = iscsit_priv_cmd(cmd);
898 struct skb_shared_info *ssi = skb_shinfo(csk->skb);
899 skb_frag_t *dfrag = &ssi->frags[pdu_cb->dfrag_idx];
900
901 sg_init_table(&ccmd->sg, 1);
902 sg_set_page(&ccmd->sg, skb_frag_page(dfrag),
903 skb_frag_size(dfrag), skb_frag_off(dfrag));
904 get_page(skb_frag_page(dfrag));
905
906 cmd->se_cmd.t_data_sg = &ccmd->sg;
907 cmd->se_cmd.t_data_nents = 1;
908
909 ccmd->release = true;
910 } else {
911 struct scatterlist *sg = &cmd->se_cmd.t_data_sg[0];
912 u32 sg_nents = max(1UL, DIV_ROUND_UP(pdu_cb->dlen, PAGE_SIZE));
913
914 cxgbit_skb_copy_to_sg(csk->skb, sg, sg_nents, 0);
915 }
916
917 cmd->write_data_done += pdu_cb->dlen;
918
919 if (cmd->write_data_done == cmd->se_cmd.data_length) {
920 spin_lock_bh(&cmd->istate_lock);
921 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
922 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
923 spin_unlock_bh(&cmd->istate_lock);
924 }
925
926 return IMMEDIATE_DATA_NORMAL_OPERATION;
927 }
928
929 static int
930 cxgbit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
931 bool dump_payload)
932 {
933 struct iscsi_conn *conn = cmd->conn;
934 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
935 /*
936 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
937 */
938 if (dump_payload)
939 goto after_immediate_data;
940
941 immed_ret = cxgbit_handle_immediate_data(cmd, hdr,
942 cmd->first_burst_len);
943 after_immediate_data:
944 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
945 /*
946 * A PDU/CmdSN carrying Immediate Data passed
947 * DataCRC, check against ExpCmdSN/MaxCmdSN if
948 * Immediate Bit is not set.
949 */
950 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
951 (unsigned char *)hdr,
952 hdr->cmdsn);
953 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
954 return -1;
955
956 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
957 target_put_sess_cmd(&cmd->se_cmd);
958 return 0;
959 } else if (cmd->unsolicited_data) {
960 iscsit_set_unsolicited_dataout(cmd);
961 }
962
963 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
964 /*
965 * Immediate Data failed DataCRC and ERL>=1,
966 * silently drop this PDU and let the initiator
967 * plug the CmdSN gap.
968 *
969 * FIXME: Send Unsolicited NOPIN with reserved
970 * TTT here to help the initiator figure out
971 * the missing CmdSN, although they should be
972 * intelligent enough to determine the missing
973 * CmdSN and issue a retry to plug the sequence.
974 */
975 cmd->i_state = ISTATE_REMOVE;
976 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
977 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
978 return -1;
979
980 return 0;
981 }
982
983 static int
984 cxgbit_handle_scsi_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
985 {
986 struct iscsi_conn *conn = csk->conn;
987 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
988 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)pdu_cb->hdr;
989 int rc;
990 bool dump_payload = false;
991
992 rc = iscsit_setup_scsi_cmd(conn, cmd, (unsigned char *)hdr);
993 if (rc < 0)
994 return rc;
995
996 if (pdu_cb->dlen && (pdu_cb->dlen == cmd->se_cmd.data_length) &&
997 (pdu_cb->nr_dfrags == 1))
998 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
999
1000 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1001 if (rc < 0)
1002 return 0;
1003 else if (rc > 0)
1004 dump_payload = true;
1005
1006 if (!pdu_cb->dlen)
1007 return 0;
1008
1009 return cxgbit_get_immediate_data(cmd, hdr, dump_payload);
1010 }
1011
1012 static int cxgbit_handle_iscsi_dataout(struct cxgbit_sock *csk)
1013 {
1014 struct scatterlist *sg_start;
1015 struct iscsi_conn *conn = csk->conn;
1016 struct iscsi_cmd *cmd = NULL;
1017 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1018 struct iscsi_data *hdr = (struct iscsi_data *)pdu_cb->hdr;
1019 u32 data_offset = be32_to_cpu(hdr->offset);
1020 u32 data_len = pdu_cb->dlen;
1021 int rc, sg_nents, sg_off;
1022 bool dcrc_err = false;
1023
1024 if (pdu_cb->flags & PDUCBF_RX_DDP_CMP) {
1025 u32 offset = be32_to_cpu(hdr->offset);
1026 u32 ddp_data_len;
1027 u32 payload_length = ntoh24(hdr->dlength);
1028 bool success = false;
1029
1030 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 0);
1031 if (!cmd)
1032 return 0;
1033
1034 ddp_data_len = offset - cmd->write_data_done;
1035 atomic_long_add(ddp_data_len, &conn->sess->rx_data_octets);
1036
1037 cmd->write_data_done = offset;
1038 cmd->next_burst_len = ddp_data_len;
1039 cmd->data_sn = be32_to_cpu(hdr->datasn);
1040
1041 rc = __iscsit_check_dataout_hdr(conn, (unsigned char *)hdr,
1042 cmd, payload_length, &success);
1043 if (rc < 0)
1044 return rc;
1045 else if (!success)
1046 return 0;
1047 } else {
1048 rc = iscsit_check_dataout_hdr(conn, (unsigned char *)hdr, &cmd);
1049 if (rc < 0)
1050 return rc;
1051 else if (!cmd)
1052 return 0;
1053 }
1054
1055 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
1056 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1057 " DataSN: 0x%08x\n",
1058 hdr->itt, hdr->offset, data_len,
1059 hdr->datasn);
1060
1061 dcrc_err = true;
1062 goto check_payload;
1063 }
1064
1065 pr_debug("DataOut data_len: %u, "
1066 "write_data_done: %u, data_length: %u\n",
1067 data_len, cmd->write_data_done,
1068 cmd->se_cmd.data_length);
1069
1070 if (!(pdu_cb->flags & PDUCBF_RX_DATA_DDPD)) {
1071 u32 skip = data_offset % PAGE_SIZE;
1072
1073 sg_off = data_offset / PAGE_SIZE;
1074 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1075 sg_nents = max(1UL, DIV_ROUND_UP(skip + data_len, PAGE_SIZE));
1076
1077 cxgbit_skb_copy_to_sg(csk->skb, sg_start, sg_nents, skip);
1078 }
1079
1080 check_payload:
1081
1082 rc = iscsit_check_dataout_payload(cmd, hdr, dcrc_err);
1083 if (rc < 0)
1084 return rc;
1085
1086 return 0;
1087 }
1088
1089 static int cxgbit_handle_nop_out(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
1090 {
1091 struct iscsi_conn *conn = csk->conn;
1092 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1093 struct iscsi_nopout *hdr = (struct iscsi_nopout *)pdu_cb->hdr;
1094 unsigned char *ping_data = NULL;
1095 u32 payload_length = pdu_cb->dlen;
1096 int ret;
1097
1098 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1099 if (ret < 0)
1100 return 0;
1101
1102 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
1103 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1104 pr_err("Unable to recover from"
1105 " NOPOUT Ping DataCRC failure while in"
1106 " ERL=0.\n");
1107 ret = -1;
1108 goto out;
1109 } else {
1110 /*
1111 * drop this PDU and let the
1112 * initiator plug the CmdSN gap.
1113 */
1114 pr_info("Dropping NOPOUT"
1115 " Command CmdSN: 0x%08x due to"
1116 " DataCRC error.\n", hdr->cmdsn);
1117 ret = 0;
1118 goto out;
1119 }
1120 }
1121
1122 /*
1123 * Handle NOP-OUT payload for traditional iSCSI sockets
1124 */
1125 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1126 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1127 if (!ping_data) {
1128 pr_err("Unable to allocate memory for"
1129 " NOPOUT ping data.\n");
1130 ret = -1;
1131 goto out;
1132 }
1133
1134 skb_copy_bits(csk->skb, pdu_cb->doffset,
1135 ping_data, payload_length);
1136
1137 ping_data[payload_length] = '\0';
1138 /*
1139 * Attach ping data to struct iscsi_cmd->buf_ptr.
1140 */
1141 cmd->buf_ptr = ping_data;
1142 cmd->buf_ptr_size = payload_length;
1143
1144 pr_debug("Got %u bytes of NOPOUT ping"
1145 " data.\n", payload_length);
1146 pr_debug("Ping Data: \"%s\"\n", ping_data);
1147 }
1148
1149 return iscsit_process_nop_out(conn, cmd, hdr);
1150 out:
1151 if (cmd)
1152 iscsit_free_cmd(cmd, false);
1153 return ret;
1154 }
1155
1156 static int
1157 cxgbit_handle_text_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
1158 {
1159 struct iscsi_conn *conn = csk->conn;
1160 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1161 struct iscsi_text *hdr = (struct iscsi_text *)pdu_cb->hdr;
1162 u32 payload_length = pdu_cb->dlen;
1163 int rc;
1164 unsigned char *text_in = NULL;
1165
1166 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1167 if (rc < 0)
1168 return rc;
1169
1170 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
1171 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1172 pr_err("Unable to recover from"
1173 " Text Data digest failure while in"
1174 " ERL=0.\n");
1175 goto reject;
1176 } else {
1177 /*
1178 * drop this PDU and let the
1179 * initiator plug the CmdSN gap.
1180 */
1181 pr_info("Dropping Text"
1182 " Command CmdSN: 0x%08x due to"
1183 " DataCRC error.\n", hdr->cmdsn);
1184 return 0;
1185 }
1186 }
1187
1188 if (payload_length) {
1189 text_in = kzalloc(payload_length, GFP_KERNEL);
1190 if (!text_in) {
1191 pr_err("Unable to allocate text_in of payload_length: %u\n",
1192 payload_length);
1193 return -ENOMEM;
1194 }
1195 skb_copy_bits(csk->skb, pdu_cb->doffset,
1196 text_in, payload_length);
1197
1198 text_in[payload_length - 1] = '\0';
1199
1200 cmd->text_in_ptr = text_in;
1201 }
1202
1203 return iscsit_process_text_cmd(conn, cmd, hdr);
1204
1205 reject:
1206 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1207 pdu_cb->hdr);
1208 }
1209
1210 static int cxgbit_target_rx_opcode(struct cxgbit_sock *csk)
1211 {
1212 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1213 struct iscsi_hdr *hdr = (struct iscsi_hdr *)pdu_cb->hdr;
1214 struct iscsi_conn *conn = csk->conn;
1215 struct iscsi_cmd *cmd = NULL;
1216 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1217 int ret = -EINVAL;
1218
1219 switch (opcode) {
1220 case ISCSI_OP_SCSI_CMD:
1221 cmd = cxgbit_allocate_cmd(csk);
1222 if (!cmd)
1223 goto reject;
1224
1225 ret = cxgbit_handle_scsi_cmd(csk, cmd);
1226 break;
1227 case ISCSI_OP_SCSI_DATA_OUT:
1228 ret = cxgbit_handle_iscsi_dataout(csk);
1229 break;
1230 case ISCSI_OP_NOOP_OUT:
1231 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1232 cmd = cxgbit_allocate_cmd(csk);
1233 if (!cmd)
1234 goto reject;
1235 }
1236
1237 ret = cxgbit_handle_nop_out(csk, cmd);
1238 break;
1239 case ISCSI_OP_SCSI_TMFUNC:
1240 cmd = cxgbit_allocate_cmd(csk);
1241 if (!cmd)
1242 goto reject;
1243
1244 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1245 (unsigned char *)hdr);
1246 break;
1247 case ISCSI_OP_TEXT:
1248 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1249 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1250 if (!cmd)
1251 goto reject;
1252 } else {
1253 cmd = cxgbit_allocate_cmd(csk);
1254 if (!cmd)
1255 goto reject;
1256 }
1257
1258 ret = cxgbit_handle_text_cmd(csk, cmd);
1259 break;
1260 case ISCSI_OP_LOGOUT:
1261 cmd = cxgbit_allocate_cmd(csk);
1262 if (!cmd)
1263 goto reject;
1264
1265 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1266 if (ret > 0)
1267 wait_for_completion_timeout(&conn->conn_logout_comp,
1268 SECONDS_FOR_LOGOUT_COMP
1269 * HZ);
1270 break;
1271 case ISCSI_OP_SNACK:
1272 ret = iscsit_handle_snack(conn, (unsigned char *)hdr);
1273 break;
1274 default:
1275 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1276 dump_stack();
1277 break;
1278 }
1279
1280 return ret;
1281
1282 reject:
1283 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1284 (unsigned char *)hdr);
1285 return ret;
1286 }
1287
1288 static int cxgbit_rx_opcode(struct cxgbit_sock *csk)
1289 {
1290 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1291 struct iscsi_conn *conn = csk->conn;
1292 struct iscsi_hdr *hdr = pdu_cb->hdr;
1293 u8 opcode;
1294
1295 if (pdu_cb->flags & PDUCBF_RX_HCRC_ERR) {
1296 atomic_long_inc(&conn->sess->conn_digest_errors);
1297 goto transport_err;
1298 }
1299
1300 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
1301 goto transport_err;
1302
1303 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1304
1305 if (conn->sess->sess_ops->SessionType &&
1306 ((!(opcode & ISCSI_OP_TEXT)) ||
1307 (!(opcode & ISCSI_OP_LOGOUT)))) {
1308 pr_err("Received illegal iSCSI Opcode: 0x%02x"
1309 " while in Discovery Session, rejecting.\n", opcode);
1310 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1311 (unsigned char *)hdr);
1312 goto transport_err;
1313 }
1314
1315 if (cxgbit_target_rx_opcode(csk) < 0)
1316 goto transport_err;
1317
1318 return 0;
1319
1320 transport_err:
1321 return -1;
1322 }
1323
1324 static int cxgbit_rx_login_pdu(struct cxgbit_sock *csk)
1325 {
1326 struct iscsi_conn *conn = csk->conn;
1327 struct iscsi_login *login = conn->login;
1328 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1329 struct iscsi_login_req *login_req;
1330
1331 login_req = (struct iscsi_login_req *)login->req;
1332 memcpy(login_req, pdu_cb->hdr, sizeof(*login_req));
1333
1334 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1335 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1336 login_req->flags, login_req->itt, login_req->cmdsn,
1337 login_req->exp_statsn, login_req->cid, pdu_cb->dlen);
1338 /*
1339 * Setup the initial iscsi_login values from the leading
1340 * login request PDU.
1341 */
1342 if (login->first_request) {
1343 login_req = (struct iscsi_login_req *)login->req;
1344 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1345 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(
1346 login_req->flags);
1347 login->version_min = login_req->min_version;
1348 login->version_max = login_req->max_version;
1349 memcpy(login->isid, login_req->isid, 6);
1350 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1351 login->init_task_tag = login_req->itt;
1352 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1353 login->cid = be16_to_cpu(login_req->cid);
1354 login->tsih = be16_to_cpu(login_req->tsih);
1355 }
1356
1357 if (iscsi_target_check_login_request(conn, login) < 0)
1358 return -1;
1359
1360 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1361 skb_copy_bits(csk->skb, pdu_cb->doffset, login->req_buf, pdu_cb->dlen);
1362
1363 return 0;
1364 }
1365
1366 static int
1367 cxgbit_process_iscsi_pdu(struct cxgbit_sock *csk, struct sk_buff *skb, int idx)
1368 {
1369 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, idx);
1370 int ret;
1371
1372 cxgbit_rx_pdu_cb(skb) = pdu_cb;
1373
1374 csk->skb = skb;
1375
1376 if (!test_bit(CSK_LOGIN_DONE, &csk->com.flags)) {
1377 ret = cxgbit_rx_login_pdu(csk);
1378 set_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags);
1379 } else {
1380 ret = cxgbit_rx_opcode(csk);
1381 }
1382
1383 return ret;
1384 }
1385
1386 static void cxgbit_lro_skb_dump(struct sk_buff *skb)
1387 {
1388 struct skb_shared_info *ssi = skb_shinfo(skb);
1389 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
1390 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
1391 u8 i;
1392
1393 pr_info("skb 0x%p, head 0x%p, 0x%p, len %u,%u, frags %u.\n",
1394 skb, skb->head, skb->data, skb->len, skb->data_len,
1395 ssi->nr_frags);
1396 pr_info("skb 0x%p, lro_cb, csk 0x%p, pdu %u, %u.\n",
1397 skb, lro_cb->csk, lro_cb->pdu_idx, lro_cb->pdu_totallen);
1398
1399 for (i = 0; i < lro_cb->pdu_idx; i++, pdu_cb++)
1400 pr_info("skb 0x%p, pdu %d, %u, f 0x%x, seq 0x%x, dcrc 0x%x, "
1401 "frags %u.\n",
1402 skb, i, pdu_cb->pdulen, pdu_cb->flags, pdu_cb->seq,
1403 pdu_cb->ddigest, pdu_cb->frags);
1404 for (i = 0; i < ssi->nr_frags; i++)
1405 pr_info("skb 0x%p, frag %d, off %u, sz %u.\n",
1406 skb, i, skb_frag_off(&ssi->frags[i]),
1407 skb_frag_size(&ssi->frags[i]));
1408 }
1409
1410 static void cxgbit_lro_hskb_reset(struct cxgbit_sock *csk)
1411 {
1412 struct sk_buff *skb = csk->lro_hskb;
1413 struct skb_shared_info *ssi = skb_shinfo(skb);
1414 u8 i;
1415
1416 memset(skb->data, 0, LRO_SKB_MIN_HEADROOM);
1417 for (i = 0; i < ssi->nr_frags; i++)
1418 put_page(skb_frag_page(&ssi->frags[i]));
1419 ssi->nr_frags = 0;
1420 skb->data_len = 0;
1421 skb->truesize -= skb->len;
1422 skb->len = 0;
1423 }
1424
1425 static void
1426 cxgbit_lro_skb_merge(struct cxgbit_sock *csk, struct sk_buff *skb, u8 pdu_idx)
1427 {
1428 struct sk_buff *hskb = csk->lro_hskb;
1429 struct cxgbit_lro_pdu_cb *hpdu_cb = cxgbit_skb_lro_pdu_cb(hskb, 0);
1430 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, pdu_idx);
1431 struct skb_shared_info *hssi = skb_shinfo(hskb);
1432 struct skb_shared_info *ssi = skb_shinfo(skb);
1433 unsigned int len = 0;
1434
1435 if (pdu_cb->flags & PDUCBF_RX_HDR) {
1436 u8 hfrag_idx = hssi->nr_frags;
1437
1438 hpdu_cb->flags |= pdu_cb->flags;
1439 hpdu_cb->seq = pdu_cb->seq;
1440 hpdu_cb->hdr = pdu_cb->hdr;
1441 hpdu_cb->hlen = pdu_cb->hlen;
1442
1443 memcpy(&hssi->frags[hfrag_idx], &ssi->frags[pdu_cb->hfrag_idx],
1444 sizeof(skb_frag_t));
1445
1446 get_page(skb_frag_page(&hssi->frags[hfrag_idx]));
1447 hssi->nr_frags++;
1448 hpdu_cb->frags++;
1449 hpdu_cb->hfrag_idx = hfrag_idx;
1450
1451 len = skb_frag_size(&hssi->frags[hfrag_idx]);
1452 hskb->len += len;
1453 hskb->data_len += len;
1454 hskb->truesize += len;
1455 }
1456
1457 if (pdu_cb->flags & PDUCBF_RX_DATA) {
1458 u8 dfrag_idx = hssi->nr_frags, i;
1459
1460 hpdu_cb->flags |= pdu_cb->flags;
1461 hpdu_cb->dfrag_idx = dfrag_idx;
1462
1463 len = 0;
1464 for (i = 0; i < pdu_cb->nr_dfrags; dfrag_idx++, i++) {
1465 memcpy(&hssi->frags[dfrag_idx],
1466 &ssi->frags[pdu_cb->dfrag_idx + i],
1467 sizeof(skb_frag_t));
1468
1469 get_page(skb_frag_page(&hssi->frags[dfrag_idx]));
1470
1471 len += skb_frag_size(&hssi->frags[dfrag_idx]);
1472
1473 hssi->nr_frags++;
1474 hpdu_cb->frags++;
1475 }
1476
1477 hpdu_cb->dlen = pdu_cb->dlen;
1478 hpdu_cb->doffset = hpdu_cb->hlen;
1479 hpdu_cb->nr_dfrags = pdu_cb->nr_dfrags;
1480 hskb->len += len;
1481 hskb->data_len += len;
1482 hskb->truesize += len;
1483 }
1484
1485 if (pdu_cb->flags & PDUCBF_RX_STATUS) {
1486 hpdu_cb->flags |= pdu_cb->flags;
1487
1488 if (hpdu_cb->flags & PDUCBF_RX_DATA)
1489 hpdu_cb->flags &= ~PDUCBF_RX_DATA_DDPD;
1490
1491 hpdu_cb->ddigest = pdu_cb->ddigest;
1492 hpdu_cb->pdulen = pdu_cb->pdulen;
1493 }
1494 }
1495
1496 static int cxgbit_process_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
1497 {
1498 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
1499 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
1500 u8 pdu_idx = 0, last_idx = 0;
1501 int ret = 0;
1502
1503 if (!pdu_cb->complete) {
1504 cxgbit_lro_skb_merge(csk, skb, 0);
1505
1506 if (pdu_cb->flags & PDUCBF_RX_STATUS) {
1507 struct sk_buff *hskb = csk->lro_hskb;
1508
1509 ret = cxgbit_process_iscsi_pdu(csk, hskb, 0);
1510
1511 cxgbit_lro_hskb_reset(csk);
1512
1513 if (ret < 0)
1514 goto out;
1515 }
1516
1517 pdu_idx = 1;
1518 }
1519
1520 if (lro_cb->pdu_idx)
1521 last_idx = lro_cb->pdu_idx - 1;
1522
1523 for (; pdu_idx <= last_idx; pdu_idx++) {
1524 ret = cxgbit_process_iscsi_pdu(csk, skb, pdu_idx);
1525 if (ret < 0)
1526 goto out;
1527 }
1528
1529 if ((!lro_cb->complete) && lro_cb->pdu_idx)
1530 cxgbit_lro_skb_merge(csk, skb, lro_cb->pdu_idx);
1531
1532 out:
1533 return ret;
1534 }
1535
1536 static int cxgbit_rx_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
1537 {
1538 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
1539 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
1540 int ret = -1;
1541
1542 if ((pdu_cb->flags & PDUCBF_RX_HDR) &&
1543 (pdu_cb->seq != csk->rcv_nxt)) {
1544 pr_info("csk 0x%p, tid 0x%x, seq 0x%x != 0x%x.\n",
1545 csk, csk->tid, pdu_cb->seq, csk->rcv_nxt);
1546 cxgbit_lro_skb_dump(skb);
1547 return ret;
1548 }
1549
1550 csk->rcv_nxt += lro_cb->pdu_totallen;
1551
1552 ret = cxgbit_process_lro_skb(csk, skb);
1553
1554 csk->rx_credits += lro_cb->pdu_totallen;
1555
1556 if (csk->rx_credits >= (csk->rcv_win / 4))
1557 cxgbit_rx_data_ack(csk);
1558
1559 return ret;
1560 }
1561
1562 static int cxgbit_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
1563 {
1564 struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
1565 int ret = -1;
1566
1567 if (likely(cxgbit_skcb_flags(skb) & SKCBF_RX_LRO)) {
1568 if (is_t5(lldi->adapter_type))
1569 ret = cxgbit_rx_lro_skb(csk, skb);
1570 else
1571 ret = cxgbit_process_lro_skb(csk, skb);
1572 }
1573
1574 __kfree_skb(skb);
1575 return ret;
1576 }
1577
1578 static bool cxgbit_rxq_len(struct cxgbit_sock *csk, struct sk_buff_head *rxq)
1579 {
1580 spin_lock_bh(&csk->rxq.lock);
1581 if (skb_queue_len(&csk->rxq)) {
1582 skb_queue_splice_init(&csk->rxq, rxq);
1583 spin_unlock_bh(&csk->rxq.lock);
1584 return true;
1585 }
1586 spin_unlock_bh(&csk->rxq.lock);
1587 return false;
1588 }
1589
1590 static int cxgbit_wait_rxq(struct cxgbit_sock *csk)
1591 {
1592 struct sk_buff *skb;
1593 struct sk_buff_head rxq;
1594
1595 skb_queue_head_init(&rxq);
1596
1597 wait_event_interruptible(csk->waitq, cxgbit_rxq_len(csk, &rxq));
1598
1599 if (signal_pending(current))
1600 goto out;
1601
1602 while ((skb = __skb_dequeue(&rxq))) {
1603 if (cxgbit_rx_skb(csk, skb))
1604 goto out;
1605 }
1606
1607 return 0;
1608 out:
1609 __skb_queue_purge(&rxq);
1610 return -1;
1611 }
1612
1613 int cxgbit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1614 {
1615 struct cxgbit_sock *csk = conn->context;
1616 int ret = -1;
1617
1618 while (!test_and_clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags)) {
1619 ret = cxgbit_wait_rxq(csk);
1620 if (ret) {
1621 clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags);
1622 break;
1623 }
1624 }
1625
1626 return ret;
1627 }
1628
1629 void cxgbit_get_rx_pdu(struct iscsi_conn *conn)
1630 {
1631 struct cxgbit_sock *csk = conn->context;
1632
1633 while (!kthread_should_stop()) {
1634 iscsit_thread_check_cpumask(conn, current, 0);
1635 if (cxgbit_wait_rxq(csk))
1636 return;
1637 }
1638 }
Linux with added FPC-III support