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Linux 4.16.11
[linux/fpc-iii.git] / drivers / target / iscsi / cxgbit / cxgbit_target.c
blob514986b57c2d60ce19c1074f4d19d65dd550be2e
1 /*
2 * Copyright (c) 2016 Chelsio Communications, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 #include <linux/workqueue.h>
10 #include <linux/kthread.h>
11 #include <linux/sched/signal.h>
12
13 #include <asm/unaligned.h>
14 #include <net/tcp.h>
15 #include <target/target_core_base.h>
16 #include <target/target_core_fabric.h>
17 #include "cxgbit.h"
18
19 struct sge_opaque_hdr {
20 void *dev;
21 dma_addr_t addr[MAX_SKB_FRAGS + 1];
22 };
23
24 static const u8 cxgbit_digest_len[] = {0, 4, 4, 8};
25
26 #define TX_HDR_LEN (sizeof(struct sge_opaque_hdr) + \
27 sizeof(struct fw_ofld_tx_data_wr))
28
29 static struct sk_buff *
30 __cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len, bool iso)
31 {
32 struct sk_buff *skb = NULL;
33 u8 submode = 0;
34 int errcode;
35 static const u32 hdr_len = TX_HDR_LEN + ISCSI_HDR_LEN;
36
37 if (len) {
38 skb = alloc_skb_with_frags(hdr_len, len,
39 0, &errcode,
40 GFP_KERNEL);
41 if (!skb)
42 return NULL;
43
44 skb_reserve(skb, TX_HDR_LEN);
45 skb_reset_transport_header(skb);
46 __skb_put(skb, ISCSI_HDR_LEN);
47 skb->data_len = len;
48 skb->len += len;
49 submode |= (csk->submode & CXGBIT_SUBMODE_DCRC);
50
51 } else {
52 u32 iso_len = iso ? sizeof(struct cpl_tx_data_iso) : 0;
53
54 skb = alloc_skb(hdr_len + iso_len, GFP_KERNEL);
55 if (!skb)
56 return NULL;
57
58 skb_reserve(skb, TX_HDR_LEN + iso_len);
59 skb_reset_transport_header(skb);
60 __skb_put(skb, ISCSI_HDR_LEN);
61 }
62
63 submode |= (csk->submode & CXGBIT_SUBMODE_HCRC);
64 cxgbit_skcb_submode(skb) = submode;
65 cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[submode];
66 cxgbit_skcb_flags(skb) |= SKCBF_TX_NEED_HDR;
67 return skb;
68 }
69
70 static struct sk_buff *cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len)
71 {
72 return __cxgbit_alloc_skb(csk, len, false);
73 }
74
75 /*
76 * cxgbit_is_ofld_imm - check whether a packet can be sent as immediate data
77 * @skb: the packet
78 *
79 * Returns true if a packet can be sent as an offload WR with immediate
80 * data. We currently use the same limit as for Ethernet packets.
81 */
82 static int cxgbit_is_ofld_imm(const struct sk_buff *skb)
83 {
84 int length = skb->len;
85
86 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR))
87 length += sizeof(struct fw_ofld_tx_data_wr);
88
89 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_ISO))
90 length += sizeof(struct cpl_tx_data_iso);
91
92 #define MAX_IMM_TX_PKT_LEN 256
93 return length <= MAX_IMM_TX_PKT_LEN;
94 }
95
96 /*
97 * cxgbit_sgl_len - calculates the size of an SGL of the given capacity
98 * @n: the number of SGL entries
99 * Calculates the number of flits needed for a scatter/gather list that
100 * can hold the given number of entries.
101 */
102 static inline unsigned int cxgbit_sgl_len(unsigned int n)
103 {
104 n--;
105 return (3 * n) / 2 + (n & 1) + 2;
106 }
107
108 /*
109 * cxgbit_calc_tx_flits_ofld - calculate # of flits for an offload packet
110 * @skb: the packet
111 *
112 * Returns the number of flits needed for the given offload packet.
113 * These packets are already fully constructed and no additional headers
114 * will be added.
115 */
116 static unsigned int cxgbit_calc_tx_flits_ofld(const struct sk_buff *skb)
117 {
118 unsigned int flits, cnt;
119
120 if (cxgbit_is_ofld_imm(skb))
121 return DIV_ROUND_UP(skb->len, 8);
122 flits = skb_transport_offset(skb) / 8;
123 cnt = skb_shinfo(skb)->nr_frags;
124 if (skb_tail_pointer(skb) != skb_transport_header(skb))
125 cnt++;
126 return flits + cxgbit_sgl_len(cnt);
127 }
128
129 #define CXGBIT_ISO_FSLICE 0x1
130 #define CXGBIT_ISO_LSLICE 0x2
131 static void
132 cxgbit_cpl_tx_data_iso(struct sk_buff *skb, struct cxgbit_iso_info *iso_info)
133 {
134 struct cpl_tx_data_iso *cpl;
135 unsigned int submode = cxgbit_skcb_submode(skb);
136 unsigned int fslice = !!(iso_info->flags & CXGBIT_ISO_FSLICE);
137 unsigned int lslice = !!(iso_info->flags & CXGBIT_ISO_LSLICE);
138
139 cpl = __skb_push(skb, sizeof(*cpl));
140
141 cpl->op_to_scsi = htonl(CPL_TX_DATA_ISO_OP_V(CPL_TX_DATA_ISO) |
142 CPL_TX_DATA_ISO_FIRST_V(fslice) |
143 CPL_TX_DATA_ISO_LAST_V(lslice) |
144 CPL_TX_DATA_ISO_CPLHDRLEN_V(0) |
145 CPL_TX_DATA_ISO_HDRCRC_V(submode & 1) |
146 CPL_TX_DATA_ISO_PLDCRC_V(((submode >> 1) & 1)) |
147 CPL_TX_DATA_ISO_IMMEDIATE_V(0) |
148 CPL_TX_DATA_ISO_SCSI_V(2));
149
150 cpl->ahs_len = 0;
151 cpl->mpdu = htons(DIV_ROUND_UP(iso_info->mpdu, 4));
152 cpl->burst_size = htonl(DIV_ROUND_UP(iso_info->burst_len, 4));
153 cpl->len = htonl(iso_info->len);
154 cpl->reserved2_seglen_offset = htonl(0);
155 cpl->datasn_offset = htonl(0);
156 cpl->buffer_offset = htonl(0);
157 cpl->reserved3 = 0;
158
159 __skb_pull(skb, sizeof(*cpl));
160 }
161
162 static void
163 cxgbit_tx_data_wr(struct cxgbit_sock *csk, struct sk_buff *skb, u32 dlen,
164 u32 len, u32 credits, u32 compl)
165 {
166 struct fw_ofld_tx_data_wr *req;
167 const struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
168 u32 submode = cxgbit_skcb_submode(skb);
169 u32 wr_ulp_mode = 0;
170 u32 hdr_size = sizeof(*req);
171 u32 opcode = FW_OFLD_TX_DATA_WR;
172 u32 immlen = 0;
173 u32 force = is_t5(lldi->adapter_type) ? TX_FORCE_V(!submode) :
174 T6_TX_FORCE_F;
175
176 if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO) {
177 opcode = FW_ISCSI_TX_DATA_WR;
178 immlen += sizeof(struct cpl_tx_data_iso);
179 hdr_size += sizeof(struct cpl_tx_data_iso);
180 submode |= 8;
181 }
182
183 if (cxgbit_is_ofld_imm(skb))
184 immlen += dlen;
185
186 req = __skb_push(skb, hdr_size);
187 req->op_to_immdlen = cpu_to_be32(FW_WR_OP_V(opcode) |
188 FW_WR_COMPL_V(compl) |
189 FW_WR_IMMDLEN_V(immlen));
190 req->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(csk->tid) |
191 FW_WR_LEN16_V(credits));
192 req->plen = htonl(len);
193 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP_MODE_ISCSI) |
194 FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
195
196 req->tunnel_to_proxy = htonl((wr_ulp_mode) | force |
197 FW_OFLD_TX_DATA_WR_SHOVE_V(skb_peek(&csk->txq) ? 0 : 1));
198 }
199
200 static void cxgbit_arp_failure_skb_discard(void *handle, struct sk_buff *skb)
201 {
202 kfree_skb(skb);
203 }
204
205 void cxgbit_push_tx_frames(struct cxgbit_sock *csk)
206 {
207 struct sk_buff *skb;
208
209 while (csk->wr_cred && ((skb = skb_peek(&csk->txq)) != NULL)) {
210 u32 dlen = skb->len;
211 u32 len = skb->len;
212 u32 credits_needed;
213 u32 compl = 0;
214 u32 flowclen16 = 0;
215 u32 iso_cpl_len = 0;
216
217 if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO)
218 iso_cpl_len = sizeof(struct cpl_tx_data_iso);
219
220 if (cxgbit_is_ofld_imm(skb))
221 credits_needed = DIV_ROUND_UP(dlen + iso_cpl_len, 16);
222 else
223 credits_needed = DIV_ROUND_UP((8 *
224 cxgbit_calc_tx_flits_ofld(skb)) +
225 iso_cpl_len, 16);
226
227 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR))
228 credits_needed += DIV_ROUND_UP(
229 sizeof(struct fw_ofld_tx_data_wr), 16);
230 /*
231 * Assumes the initial credits is large enough to support
232 * fw_flowc_wr plus largest possible first payload
233 */
234
235 if (!test_and_set_bit(CSK_TX_DATA_SENT, &csk->com.flags)) {
236 flowclen16 = cxgbit_send_tx_flowc_wr(csk);
237 csk->wr_cred -= flowclen16;
238 csk->wr_una_cred += flowclen16;
239 }
240
241 if (csk->wr_cred < credits_needed) {
242 pr_debug("csk 0x%p, skb %u/%u, wr %d < %u.\n",
243 csk, skb->len, skb->data_len,
244 credits_needed, csk->wr_cred);
245 break;
246 }
247 __skb_unlink(skb, &csk->txq);
248 set_wr_txq(skb, CPL_PRIORITY_DATA, csk->txq_idx);
249 skb->csum = (__force __wsum)(credits_needed + flowclen16);
250 csk->wr_cred -= credits_needed;
251 csk->wr_una_cred += credits_needed;
252
253 pr_debug("csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
254 csk, skb->len, skb->data_len, credits_needed,
255 csk->wr_cred, csk->wr_una_cred);
256
257 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR)) {
258 len += cxgbit_skcb_tx_extralen(skb);
259
260 if ((csk->wr_una_cred >= (csk->wr_max_cred / 2)) ||
261 (!before(csk->write_seq,
262 csk->snd_una + csk->snd_win))) {
263 compl = 1;
264 csk->wr_una_cred = 0;
265 }
266
267 cxgbit_tx_data_wr(csk, skb, dlen, len, credits_needed,
268 compl);
269 csk->snd_nxt += len;
270
271 } else if ((cxgbit_skcb_flags(skb) & SKCBF_TX_FLAG_COMPL) ||
272 (csk->wr_una_cred >= (csk->wr_max_cred / 2))) {
273 struct cpl_close_con_req *req =
274 (struct cpl_close_con_req *)skb->data;
275 req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
276 csk->wr_una_cred = 0;
277 }
278
279 cxgbit_sock_enqueue_wr(csk, skb);
280 t4_set_arp_err_handler(skb, csk,
281 cxgbit_arp_failure_skb_discard);
282
283 pr_debug("csk 0x%p,%u, skb 0x%p, %u.\n",
284 csk, csk->tid, skb, len);
285
286 cxgbit_l2t_send(csk->com.cdev, skb, csk->l2t);
287 }
288 }
289
290 static bool cxgbit_lock_sock(struct cxgbit_sock *csk)
291 {
292 spin_lock_bh(&csk->lock);
293
294 if (before(csk->write_seq, csk->snd_una + csk->snd_win))
295 csk->lock_owner = true;
296
297 spin_unlock_bh(&csk->lock);
298
299 return csk->lock_owner;
300 }
301
302 static void cxgbit_unlock_sock(struct cxgbit_sock *csk)
303 {
304 struct sk_buff_head backlogq;
305 struct sk_buff *skb;
306 void (*fn)(struct cxgbit_sock *, struct sk_buff *);
307
308 skb_queue_head_init(&backlogq);
309
310 spin_lock_bh(&csk->lock);
311 while (skb_queue_len(&csk->backlogq)) {
312 skb_queue_splice_init(&csk->backlogq, &backlogq);
313 spin_unlock_bh(&csk->lock);
314
315 while ((skb = __skb_dequeue(&backlogq))) {
316 fn = cxgbit_skcb_rx_backlog_fn(skb);
317 fn(csk, skb);
318 }
319
320 spin_lock_bh(&csk->lock);
321 }
322
323 csk->lock_owner = false;
324 spin_unlock_bh(&csk->lock);
325 }
326
327 static int cxgbit_queue_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
328 {
329 int ret = 0;
330
331 wait_event_interruptible(csk->ack_waitq, cxgbit_lock_sock(csk));
332
333 if (unlikely((csk->com.state != CSK_STATE_ESTABLISHED) ||
334 signal_pending(current))) {
335 __kfree_skb(skb);
336 __skb_queue_purge(&csk->ppodq);
337 ret = -1;
338 spin_lock_bh(&csk->lock);
339 if (csk->lock_owner) {
340 spin_unlock_bh(&csk->lock);
341 goto unlock;
342 }
343 spin_unlock_bh(&csk->lock);
344 return ret;
345 }
346
347 csk->write_seq += skb->len +
348 cxgbit_skcb_tx_extralen(skb);
349
350 skb_queue_splice_tail_init(&csk->ppodq, &csk->txq);
351 __skb_queue_tail(&csk->txq, skb);
352 cxgbit_push_tx_frames(csk);
353
354 unlock:
355 cxgbit_unlock_sock(csk);
356 return ret;
357 }
358
359 static int
360 cxgbit_map_skb(struct iscsi_cmd *cmd, struct sk_buff *skb, u32 data_offset,
361 u32 data_length)
362 {
363 u32 i = 0, nr_frags = MAX_SKB_FRAGS;
364 u32 padding = ((-data_length) & 3);
365 struct scatterlist *sg;
366 struct page *page;
367 unsigned int page_off;
368
369 if (padding)
370 nr_frags--;
371
372 /*
373 * We know each entry in t_data_sg contains a page.
374 */
375 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
376 page_off = (data_offset % PAGE_SIZE);
377
378 while (data_length && (i < nr_frags)) {
379 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
380
381 page = sg_page(sg);
382
383 get_page(page);
384 skb_fill_page_desc(skb, i, page, sg->offset + page_off,
385 cur_len);
386 skb->data_len += cur_len;
387 skb->len += cur_len;
388 skb->truesize += cur_len;
389
390 data_length -= cur_len;
391 page_off = 0;
392 sg = sg_next(sg);
393 i++;
394 }
395
396 if (data_length)
397 return -1;
398
399 if (padding) {
400 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
401 if (!page)
402 return -1;
403 skb_fill_page_desc(skb, i, page, 0, padding);
404 skb->data_len += padding;
405 skb->len += padding;
406 skb->truesize += padding;
407 }
408
409 return 0;
410 }
411
412 static int
413 cxgbit_tx_datain_iso(struct cxgbit_sock *csk, struct iscsi_cmd *cmd,
414 struct iscsi_datain_req *dr)
415 {
416 struct iscsi_conn *conn = csk->conn;
417 struct sk_buff *skb;
418 struct iscsi_datain datain;
419 struct cxgbit_iso_info iso_info;
420 u32 data_length = cmd->se_cmd.data_length;
421 u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength;
422 u32 num_pdu, plen, tx_data = 0;
423 bool task_sense = !!(cmd->se_cmd.se_cmd_flags &
424 SCF_TRANSPORT_TASK_SENSE);
425 bool set_statsn = false;
426 int ret = -1;
427
428 while (data_length) {
429 num_pdu = (data_length + mrdsl - 1) / mrdsl;
430 if (num_pdu > csk->max_iso_npdu)
431 num_pdu = csk->max_iso_npdu;
432
433 plen = num_pdu * mrdsl;
434 if (plen > data_length)
435 plen = data_length;
436
437 skb = __cxgbit_alloc_skb(csk, 0, true);
438 if (unlikely(!skb))
439 return -ENOMEM;
440
441 memset(skb->data, 0, ISCSI_HDR_LEN);
442 cxgbit_skcb_flags(skb) |= SKCBF_TX_ISO;
443 cxgbit_skcb_submode(skb) |= (csk->submode &
444 CXGBIT_SUBMODE_DCRC);
445 cxgbit_skcb_tx_extralen(skb) = (num_pdu *
446 cxgbit_digest_len[cxgbit_skcb_submode(skb)]) +
447 ((num_pdu - 1) * ISCSI_HDR_LEN);
448
449 memset(&datain, 0, sizeof(struct iscsi_datain));
450 memset(&iso_info, 0, sizeof(iso_info));
451
452 if (!tx_data)
453 iso_info.flags |= CXGBIT_ISO_FSLICE;
454
455 if (!(data_length - plen)) {
456 iso_info.flags |= CXGBIT_ISO_LSLICE;
457 if (!task_sense) {
458 datain.flags = ISCSI_FLAG_DATA_STATUS;
459 iscsit_increment_maxcmdsn(cmd, conn->sess);
460 cmd->stat_sn = conn->stat_sn++;
461 set_statsn = true;
462 }
463 }
464
465 iso_info.burst_len = num_pdu * mrdsl;
466 iso_info.mpdu = mrdsl;
467 iso_info.len = ISCSI_HDR_LEN + plen;
468
469 cxgbit_cpl_tx_data_iso(skb, &iso_info);
470
471 datain.offset = tx_data;
472 datain.data_sn = cmd->data_sn - 1;
473
474 iscsit_build_datain_pdu(cmd, conn, &datain,
475 (struct iscsi_data_rsp *)skb->data,
476 set_statsn);
477
478 ret = cxgbit_map_skb(cmd, skb, tx_data, plen);
479 if (unlikely(ret)) {
480 __kfree_skb(skb);
481 goto out;
482 }
483
484 ret = cxgbit_queue_skb(csk, skb);
485 if (unlikely(ret))
486 goto out;
487
488 tx_data += plen;
489 data_length -= plen;
490
491 cmd->read_data_done += plen;
492 cmd->data_sn += num_pdu;
493 }
494
495 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
496
497 return 0;
498
499 out:
500 return ret;
501 }
502
503 static int
504 cxgbit_tx_datain(struct cxgbit_sock *csk, struct iscsi_cmd *cmd,
505 const struct iscsi_datain *datain)
506 {
507 struct sk_buff *skb;
508 int ret = 0;
509
510 skb = cxgbit_alloc_skb(csk, 0);
511 if (unlikely(!skb))
512 return -ENOMEM;
513
514 memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN);
515
516 if (datain->length) {
517 cxgbit_skcb_submode(skb) |= (csk->submode &
518 CXGBIT_SUBMODE_DCRC);
519 cxgbit_skcb_tx_extralen(skb) =
520 cxgbit_digest_len[cxgbit_skcb_submode(skb)];
521 }
522
523 ret = cxgbit_map_skb(cmd, skb, datain->offset, datain->length);
524 if (ret < 0) {
525 __kfree_skb(skb);
526 return ret;
527 }
528
529 return cxgbit_queue_skb(csk, skb);
530 }
531
532 static int
533 cxgbit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
534 struct iscsi_datain_req *dr,
535 const struct iscsi_datain *datain)
536 {
537 struct cxgbit_sock *csk = conn->context;
538 u32 data_length = cmd->se_cmd.data_length;
539 u32 padding = ((-data_length) & 3);
540 u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength;
541
542 if ((data_length > mrdsl) && (!dr->recovery) &&
543 (!padding) && (!datain->offset) && csk->max_iso_npdu) {
544 atomic_long_add(data_length - datain->length,
545 &conn->sess->tx_data_octets);
546 return cxgbit_tx_datain_iso(csk, cmd, dr);
547 }
548
549 return cxgbit_tx_datain(csk, cmd, datain);
550 }
551
552 static int
553 cxgbit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
554 const void *data_buf, u32 data_buf_len)
555 {
556 struct cxgbit_sock *csk = conn->context;
557 struct sk_buff *skb;
558 u32 padding = ((-data_buf_len) & 3);
559
560 skb = cxgbit_alloc_skb(csk, data_buf_len + padding);
561 if (unlikely(!skb))
562 return -ENOMEM;
563
564 memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN);
565
566 if (data_buf_len) {
567 u32 pad_bytes = 0;
568
569 skb_store_bits(skb, ISCSI_HDR_LEN, data_buf, data_buf_len);
570
571 if (padding)
572 skb_store_bits(skb, ISCSI_HDR_LEN + data_buf_len,
573 &pad_bytes, padding);
574 }
575
576 cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[
577 cxgbit_skcb_submode(skb)];
578
579 return cxgbit_queue_skb(csk, skb);
580 }
581
582 int
583 cxgbit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
584 struct iscsi_datain_req *dr, const void *buf, u32 buf_len)
585 {
586 if (dr)
587 return cxgbit_xmit_datain_pdu(conn, cmd, dr, buf);
588 else
589 return cxgbit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
590 }
591
592 int cxgbit_validate_params(struct iscsi_conn *conn)
593 {
594 struct cxgbit_sock *csk = conn->context;
595 struct cxgbit_device *cdev = csk->com.cdev;
596 struct iscsi_param *param;
597 u32 max_xmitdsl;
598
599 param = iscsi_find_param_from_key(MAXXMITDATASEGMENTLENGTH,
600 conn->param_list);
601 if (!param)
602 return -1;
603
604 if (kstrtou32(param->value, 0, &max_xmitdsl) < 0)
605 return -1;
606
607 if (max_xmitdsl > cdev->mdsl) {
608 if (iscsi_change_param_sprintf(
609 conn, "MaxXmitDataSegmentLength=%u", cdev->mdsl))
610 return -1;
611 }
612
613 return 0;
614 }
615
616 static int cxgbit_set_digest(struct cxgbit_sock *csk)
617 {
618 struct iscsi_conn *conn = csk->conn;
619 struct iscsi_param *param;
620
621 param = iscsi_find_param_from_key(HEADERDIGEST, conn->param_list);
622 if (!param) {
623 pr_err("param not found key %s\n", HEADERDIGEST);
624 return -1;
625 }
626
627 if (!strcmp(param->value, CRC32C))
628 csk->submode |= CXGBIT_SUBMODE_HCRC;
629
630 param = iscsi_find_param_from_key(DATADIGEST, conn->param_list);
631 if (!param) {
632 csk->submode = 0;
633 pr_err("param not found key %s\n", DATADIGEST);
634 return -1;
635 }
636
637 if (!strcmp(param->value, CRC32C))
638 csk->submode |= CXGBIT_SUBMODE_DCRC;
639
640 if (cxgbit_setup_conn_digest(csk)) {
641 csk->submode = 0;
642 return -1;
643 }
644
645 return 0;
646 }
647
648 static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk)
649 {
650 struct iscsi_conn *conn = csk->conn;
651 struct iscsi_conn_ops *conn_ops = conn->conn_ops;
652 struct iscsi_param *param;
653 u32 mrdsl, mbl;
654 u32 max_npdu, max_iso_npdu;
655
656 if (conn->login->leading_connection) {
657 param = iscsi_find_param_from_key(MAXBURSTLENGTH,
658 conn->param_list);
659 if (!param) {
660 pr_err("param not found key %s\n", MAXBURSTLENGTH);
661 return -1;
662 }
663
664 if (kstrtou32(param->value, 0, &mbl) < 0)
665 return -1;
666 } else {
667 mbl = conn->sess->sess_ops->MaxBurstLength;
668 }
669
670 mrdsl = conn_ops->MaxRecvDataSegmentLength;
671 max_npdu = mbl / mrdsl;
672
673 max_iso_npdu = CXGBIT_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 (conn->login->leading_connection) {
745 param = iscsi_find_param_from_key(ERRORRECOVERYLEVEL,
746 conn->param_list);
747 if (!param) {
748 pr_err("param not found key %s\n", ERRORRECOVERYLEVEL);
749 return -1;
750 }
751 if (kstrtou8(param->value, 0, &erl) < 0)
752 return -1;
753 } else {
754 erl = conn->sess->sess_ops->ErrorRecoveryLevel;
755 }
756
757 if (!erl) {
758 int ret;
759
760 ret = cxgbit_seq_pdu_inorder(csk);
761 if (ret < 0) {
762 return -1;
763 } else if (ret > 0) {
764 if (is_t5(cdev->lldi.adapter_type))
765 goto enable_ddp;
766 else
767 goto enable_digest;
768 }
769
770 if (test_bit(CDEV_ISO_ENABLE, &cdev->flags)) {
771 if (cxgbit_set_iso_npdu(csk))
772 return -1;
773 }
774
775 enable_ddp:
776 if (test_bit(CDEV_DDP_ENABLE, &cdev->flags)) {
777 if (cxgbit_setup_conn_pgidx(csk,
778 ppm->tformat.pgsz_idx_dflt))
779 return -1;
780 set_bit(CSK_DDP_ENABLE, &csk->com.flags);
781 }
782 }
783
784 enable_digest:
785 if (cxgbit_set_digest(csk))
786 return -1;
787
788 return 0;
789 }
790
791 int
792 cxgbit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
793 u32 length)
794 {
795 struct cxgbit_sock *csk = conn->context;
796 struct sk_buff *skb;
797 u32 padding_buf = 0;
798 u8 padding = ((-length) & 3);
799
800 skb = cxgbit_alloc_skb(csk, length + padding);
801 if (!skb)
802 return -ENOMEM;
803 skb_store_bits(skb, 0, login->rsp, ISCSI_HDR_LEN);
804 skb_store_bits(skb, ISCSI_HDR_LEN, login->rsp_buf, length);
805
806 if (padding)
807 skb_store_bits(skb, ISCSI_HDR_LEN + length,
808 &padding_buf, padding);
809
810 if (login->login_complete) {
811 if (cxgbit_set_params(conn)) {
812 kfree_skb(skb);
813 return -1;
814 }
815
816 set_bit(CSK_LOGIN_DONE, &csk->com.flags);
817 }
818
819 if (cxgbit_queue_skb(csk, skb))
820 return -1;
821
822 if ((!login->login_complete) && (!login->login_failed))
823 schedule_delayed_work(&conn->login_work, 0);
824
825 return 0;
826 }
827
828 static void
829 cxgbit_skb_copy_to_sg(struct sk_buff *skb, struct scatterlist *sg,
830 unsigned int nents, u32 skip)
831 {
832 struct skb_seq_state st;
833 const u8 *buf;
834 unsigned int consumed = 0, buf_len;
835 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(skb);
836
837 skb_prepare_seq_read(skb, pdu_cb->doffset,
838 pdu_cb->doffset + pdu_cb->dlen,
839 &st);
840
841 while (true) {
842 buf_len = skb_seq_read(consumed, &buf, &st);
843 if (!buf_len) {
844 skb_abort_seq_read(&st);
845 break;
846 }
847
848 consumed += sg_pcopy_from_buffer(sg, nents, (void *)buf,
849 buf_len, skip + consumed);
850 }
851 }
852
853 static struct iscsi_cmd *cxgbit_allocate_cmd(struct cxgbit_sock *csk)
854 {
855 struct iscsi_conn *conn = csk->conn;
856 struct cxgbi_ppm *ppm = cdev2ppm(csk->com.cdev);
857 struct cxgbit_cmd *ccmd;
858 struct iscsi_cmd *cmd;
859
860 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
861 if (!cmd) {
862 pr_err("Unable to allocate iscsi_cmd + cxgbit_cmd\n");
863 return NULL;
864 }
865
866 ccmd = iscsit_priv_cmd(cmd);
867 ccmd->ttinfo.tag = ppm->tformat.no_ddp_mask;
868 ccmd->setup_ddp = true;
869
870 return cmd;
871 }
872
873 static int
874 cxgbit_handle_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
875 u32 length)
876 {
877 struct iscsi_conn *conn = cmd->conn;
878 struct cxgbit_sock *csk = conn->context;
879 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
880
881 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
882 pr_err("ImmediateData CRC32C DataDigest error\n");
883 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
884 pr_err("Unable to recover from"
885 " Immediate Data digest failure while"
886 " in ERL=0.\n");
887 iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
888 (unsigned char *)hdr);
889 return IMMEDIATE_DATA_CANNOT_RECOVER;
890 }
891
892 iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
893 (unsigned char *)hdr);
894 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
895 }
896
897 if (cmd->se_cmd.se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
898 struct cxgbit_cmd *ccmd = iscsit_priv_cmd(cmd);
899 struct skb_shared_info *ssi = skb_shinfo(csk->skb);
900 skb_frag_t *dfrag = &ssi->frags[pdu_cb->dfrag_idx];
901
902 sg_init_table(&ccmd->sg, 1);
903 sg_set_page(&ccmd->sg, dfrag->page.p, skb_frag_size(dfrag),
904 dfrag->page_offset);
905 get_page(dfrag->page.p);
906
907 cmd->se_cmd.t_data_sg = &ccmd->sg;
908 cmd->se_cmd.t_data_nents = 1;
909
910 ccmd->release = true;
911 } else {
912 struct scatterlist *sg = &cmd->se_cmd.t_data_sg[0];
913 u32 sg_nents = max(1UL, DIV_ROUND_UP(pdu_cb->dlen, PAGE_SIZE));
914
915 cxgbit_skb_copy_to_sg(csk->skb, sg, sg_nents, 0);
916 }
917
918 cmd->write_data_done += pdu_cb->dlen;
919
920 if (cmd->write_data_done == cmd->se_cmd.data_length) {
921 spin_lock_bh(&cmd->istate_lock);
922 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
923 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
924 spin_unlock_bh(&cmd->istate_lock);
925 }
926
927 return IMMEDIATE_DATA_NORMAL_OPERATION;
928 }
929
930 static int
931 cxgbit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
932 bool dump_payload)
933 {
934 struct iscsi_conn *conn = cmd->conn;
935 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
936 /*
937 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
938 */
939 if (dump_payload)
940 goto after_immediate_data;
941
942 immed_ret = cxgbit_handle_immediate_data(cmd, hdr,
943 cmd->first_burst_len);
944 after_immediate_data:
945 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
946 /*
947 * A PDU/CmdSN carrying Immediate Data passed
948 * DataCRC, check against ExpCmdSN/MaxCmdSN if
949 * Immediate Bit is not set.
950 */
951 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
952 (unsigned char *)hdr,
953 hdr->cmdsn);
954 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
955 return -1;
956
957 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
958 target_put_sess_cmd(&cmd->se_cmd);
959 return 0;
960 } else if (cmd->unsolicited_data) {
961 iscsit_set_unsoliticed_dataout(cmd);
962 }
963
964 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
965 /*
966 * Immediate Data failed DataCRC and ERL>=1,
967 * silently drop this PDU and let the initiator
968 * plug the CmdSN gap.
969 *
970 * FIXME: Send Unsolicited NOPIN with reserved
971 * TTT here to help the initiator figure out
972 * the missing CmdSN, although they should be
973 * intelligent enough to determine the missing
974 * CmdSN and issue a retry to plug the sequence.
975 */
976 cmd->i_state = ISTATE_REMOVE;
977 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
978 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
979 return -1;
980
981 return 0;
982 }
983
984 static int
985 cxgbit_handle_scsi_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
986 {
987 struct iscsi_conn *conn = csk->conn;
988 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
989 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)pdu_cb->hdr;
990 int rc;
991 bool dump_payload = false;
992
993 rc = iscsit_setup_scsi_cmd(conn, cmd, (unsigned char *)hdr);
994 if (rc < 0)
995 return rc;
996
997 if (pdu_cb->dlen && (pdu_cb->dlen == cmd->se_cmd.data_length) &&
998 (pdu_cb->nr_dfrags == 1))
999 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1000
1001 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1002 if (rc < 0)
1003 return 0;
1004 else if (rc > 0)
1005 dump_payload = true;
1006
1007 if (!pdu_cb->dlen)
1008 return 0;
1009
1010 return cxgbit_get_immediate_data(cmd, hdr, dump_payload);
1011 }
1012
1013 static int cxgbit_handle_iscsi_dataout(struct cxgbit_sock *csk)
1014 {
1015 struct scatterlist *sg_start;
1016 struct iscsi_conn *conn = csk->conn;
1017 struct iscsi_cmd *cmd = NULL;
1018 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1019 struct iscsi_data *hdr = (struct iscsi_data *)pdu_cb->hdr;
1020 u32 data_offset = be32_to_cpu(hdr->offset);
1021 u32 data_len = pdu_cb->dlen;
1022 int rc, sg_nents, sg_off;
1023 bool dcrc_err = false;
1024
1025 if (pdu_cb->flags & PDUCBF_RX_DDP_CMP) {
1026 u32 offset = be32_to_cpu(hdr->offset);
1027 u32 ddp_data_len;
1028 u32 payload_length = ntoh24(hdr->dlength);
1029 bool success = false;
1030
1031 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 0);
1032 if (!cmd)
1033 return 0;
1034
1035 ddp_data_len = offset - cmd->write_data_done;
1036 atomic_long_add(ddp_data_len, &conn->sess->rx_data_octets);
1037
1038 cmd->write_data_done = offset;
1039 cmd->next_burst_len = ddp_data_len;
1040 cmd->data_sn = be32_to_cpu(hdr->datasn);
1041
1042 rc = __iscsit_check_dataout_hdr(conn, (unsigned char *)hdr,
1043 cmd, payload_length, &success);
1044 if (rc < 0)
1045 return rc;
1046 else if (!success)
1047 return 0;
1048 } else {
1049 rc = iscsit_check_dataout_hdr(conn, (unsigned char *)hdr, &cmd);
1050 if (rc < 0)
1051 return rc;
1052 else if (!cmd)
1053 return 0;
1054 }
1055
1056 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
1057 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1058 " DataSN: 0x%08x\n",
1059 hdr->itt, hdr->offset, data_len,
1060 hdr->datasn);
1061
1062 dcrc_err = true;
1063 goto check_payload;
1064 }
1065
1066 pr_debug("DataOut data_len: %u, "
1067 "write_data_done: %u, data_length: %u\n",
1068 data_len, cmd->write_data_done,
1069 cmd->se_cmd.data_length);
1070
1071 if (!(pdu_cb->flags & PDUCBF_RX_DATA_DDPD)) {
1072 u32 skip = data_offset % PAGE_SIZE;
1073
1074 sg_off = data_offset / PAGE_SIZE;
1075 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1076 sg_nents = max(1UL, DIV_ROUND_UP(skip + data_len, PAGE_SIZE));
1077
1078 cxgbit_skb_copy_to_sg(csk->skb, sg_start, sg_nents, skip);
1079 }
1080
1081 check_payload:
1082
1083 rc = iscsit_check_dataout_payload(cmd, hdr, dcrc_err);
1084 if (rc < 0)
1085 return rc;
1086
1087 return 0;
1088 }
1089
1090 static int cxgbit_handle_nop_out(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
1091 {
1092 struct iscsi_conn *conn = csk->conn;
1093 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1094 struct iscsi_nopout *hdr = (struct iscsi_nopout *)pdu_cb->hdr;
1095 unsigned char *ping_data = NULL;
1096 u32 payload_length = pdu_cb->dlen;
1097 int ret;
1098
1099 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1100 if (ret < 0)
1101 return 0;
1102
1103 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
1104 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1105 pr_err("Unable to recover from"
1106 " NOPOUT Ping DataCRC failure while in"
1107 " ERL=0.\n");
1108 ret = -1;
1109 goto out;
1110 } else {
1111 /*
1112 * drop this PDU and let the
1113 * initiator plug the CmdSN gap.
1114 */
1115 pr_info("Dropping NOPOUT"
1116 " Command CmdSN: 0x%08x due to"
1117 " DataCRC error.\n", hdr->cmdsn);
1118 ret = 0;
1119 goto out;
1120 }
1121 }
1122
1123 /*
1124 * Handle NOP-OUT payload for traditional iSCSI sockets
1125 */
1126 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1127 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1128 if (!ping_data) {
1129 pr_err("Unable to allocate memory for"
1130 " NOPOUT ping data.\n");
1131 ret = -1;
1132 goto out;
1133 }
1134
1135 skb_copy_bits(csk->skb, pdu_cb->doffset,
1136 ping_data, payload_length);
1137
1138 ping_data[payload_length] = '\0';
1139 /*
1140 * Attach ping data to struct iscsi_cmd->buf_ptr.
1141 */
1142 cmd->buf_ptr = ping_data;
1143 cmd->buf_ptr_size = payload_length;
1144
1145 pr_debug("Got %u bytes of NOPOUT ping"
1146 " data.\n", payload_length);
1147 pr_debug("Ping Data: \"%s\"\n", ping_data);
1148 }
1149
1150 return iscsit_process_nop_out(conn, cmd, hdr);
1151 out:
1152 if (cmd)
1153 iscsit_free_cmd(cmd, false);
1154 return ret;
1155 }
1156
1157 static int
1158 cxgbit_handle_text_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
1159 {
1160 struct iscsi_conn *conn = csk->conn;
1161 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1162 struct iscsi_text *hdr = (struct iscsi_text *)pdu_cb->hdr;
1163 u32 payload_length = pdu_cb->dlen;
1164 int rc;
1165 unsigned char *text_in = NULL;
1166
1167 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1168 if (rc < 0)
1169 return rc;
1170
1171 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
1172 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1173 pr_err("Unable to recover from"
1174 " Text Data digest failure while in"
1175 " ERL=0.\n");
1176 goto reject;
1177 } else {
1178 /*
1179 * drop this PDU and let the
1180 * initiator plug the CmdSN gap.
1181 */
1182 pr_info("Dropping Text"
1183 " Command CmdSN: 0x%08x due to"
1184 " DataCRC error.\n", hdr->cmdsn);
1185 return 0;
1186 }
1187 }
1188
1189 if (payload_length) {
1190 text_in = kzalloc(payload_length, GFP_KERNEL);
1191 if (!text_in) {
1192 pr_err("Unable to allocate text_in of payload_length: %u\n",
1193 payload_length);
1194 return -ENOMEM;
1195 }
1196 skb_copy_bits(csk->skb, pdu_cb->doffset,
1197 text_in, payload_length);
1198
1199 text_in[payload_length - 1] = '\0';
1200
1201 cmd->text_in_ptr = text_in;
1202 }
1203
1204 return iscsit_process_text_cmd(conn, cmd, hdr);
1205
1206 reject:
1207 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1208 pdu_cb->hdr);
1209 }
1210
1211 static int cxgbit_target_rx_opcode(struct cxgbit_sock *csk)
1212 {
1213 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1214 struct iscsi_hdr *hdr = (struct iscsi_hdr *)pdu_cb->hdr;
1215 struct iscsi_conn *conn = csk->conn;
1216 struct iscsi_cmd *cmd = NULL;
1217 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1218 int ret = -EINVAL;
1219
1220 switch (opcode) {
1221 case ISCSI_OP_SCSI_CMD:
1222 cmd = cxgbit_allocate_cmd(csk);
1223 if (!cmd)
1224 goto reject;
1225
1226 ret = cxgbit_handle_scsi_cmd(csk, cmd);
1227 break;
1228 case ISCSI_OP_SCSI_DATA_OUT:
1229 ret = cxgbit_handle_iscsi_dataout(csk);
1230 break;
1231 case ISCSI_OP_NOOP_OUT:
1232 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1233 cmd = cxgbit_allocate_cmd(csk);
1234 if (!cmd)
1235 goto reject;
1236 }
1237
1238 ret = cxgbit_handle_nop_out(csk, cmd);
1239 break;
1240 case ISCSI_OP_SCSI_TMFUNC:
1241 cmd = cxgbit_allocate_cmd(csk);
1242 if (!cmd)
1243 goto reject;
1244
1245 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1246 (unsigned char *)hdr);
1247 break;
1248 case ISCSI_OP_TEXT:
1249 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1250 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1251 if (!cmd)
1252 goto reject;
1253 } else {
1254 cmd = cxgbit_allocate_cmd(csk);
1255 if (!cmd)
1256 goto reject;
1257 }
1258
1259 ret = cxgbit_handle_text_cmd(csk, cmd);
1260 break;
1261 case ISCSI_OP_LOGOUT:
1262 cmd = cxgbit_allocate_cmd(csk);
1263 if (!cmd)
1264 goto reject;
1265
1266 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1267 if (ret > 0)
1268 wait_for_completion_timeout(&conn->conn_logout_comp,
1269 SECONDS_FOR_LOGOUT_COMP
1270 * HZ);
1271 break;
1272 case ISCSI_OP_SNACK:
1273 ret = iscsit_handle_snack(conn, (unsigned char *)hdr);
1274 break;
1275 default:
1276 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1277 dump_stack();
1278 break;
1279 }
1280
1281 return ret;
1282
1283 reject:
1284 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1285 (unsigned char *)hdr);
1286 return ret;
1287 }
1288
1289 static int cxgbit_rx_opcode(struct cxgbit_sock *csk)
1290 {
1291 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1292 struct iscsi_conn *conn = csk->conn;
1293 struct iscsi_hdr *hdr = pdu_cb->hdr;
1294 u8 opcode;
1295
1296 if (pdu_cb->flags & PDUCBF_RX_HCRC_ERR) {
1297 atomic_long_inc(&conn->sess->conn_digest_errors);
1298 goto transport_err;
1299 }
1300
1301 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
1302 goto transport_err;
1303
1304 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1305
1306 if (conn->sess->sess_ops->SessionType &&
1307 ((!(opcode & ISCSI_OP_TEXT)) ||
1308 (!(opcode & ISCSI_OP_LOGOUT)))) {
1309 pr_err("Received illegal iSCSI Opcode: 0x%02x"
1310 " while in Discovery Session, rejecting.\n", opcode);
1311 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1312 (unsigned char *)hdr);
1313 goto transport_err;
1314 }
1315
1316 if (cxgbit_target_rx_opcode(csk) < 0)
1317 goto transport_err;
1318
1319 return 0;
1320
1321 transport_err:
1322 return -1;
1323 }
1324
1325 static int cxgbit_rx_login_pdu(struct cxgbit_sock *csk)
1326 {
1327 struct iscsi_conn *conn = csk->conn;
1328 struct iscsi_login *login = conn->login;
1329 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1330 struct iscsi_login_req *login_req;
1331
1332 login_req = (struct iscsi_login_req *)login->req;
1333 memcpy(login_req, pdu_cb->hdr, sizeof(*login_req));
1334
1335 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1336 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1337 login_req->flags, login_req->itt, login_req->cmdsn,
1338 login_req->exp_statsn, login_req->cid, pdu_cb->dlen);
1339 /*
1340 * Setup the initial iscsi_login values from the leading
1341 * login request PDU.
1342 */
1343 if (login->first_request) {
1344 login_req = (struct iscsi_login_req *)login->req;
1345 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1346 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(
1347 login_req->flags);
1348 login->version_min = login_req->min_version;
1349 login->version_max = login_req->max_version;
1350 memcpy(login->isid, login_req->isid, 6);
1351 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1352 login->init_task_tag = login_req->itt;
1353 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1354 login->cid = be16_to_cpu(login_req->cid);
1355 login->tsih = be16_to_cpu(login_req->tsih);
1356 }
1357
1358 if (iscsi_target_check_login_request(conn, login) < 0)
1359 return -1;
1360
1361 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1362 skb_copy_bits(csk->skb, pdu_cb->doffset, login->req_buf, pdu_cb->dlen);
1363
1364 return 0;
1365 }
1366
1367 static int
1368 cxgbit_process_iscsi_pdu(struct cxgbit_sock *csk, struct sk_buff *skb, int idx)
1369 {
1370 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, idx);
1371 int ret;
1372
1373 cxgbit_rx_pdu_cb(skb) = pdu_cb;
1374
1375 csk->skb = skb;
1376
1377 if (!test_bit(CSK_LOGIN_DONE, &csk->com.flags)) {
1378 ret = cxgbit_rx_login_pdu(csk);
1379 set_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags);
1380 } else {
1381 ret = cxgbit_rx_opcode(csk);
1382 }
1383
1384 return ret;
1385 }
1386
1387 static void cxgbit_lro_skb_dump(struct sk_buff *skb)
1388 {
1389 struct skb_shared_info *ssi = skb_shinfo(skb);
1390 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
1391 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
1392 u8 i;
1393
1394 pr_info("skb 0x%p, head 0x%p, 0x%p, len %u,%u, frags %u.\n",
1395 skb, skb->head, skb->data, skb->len, skb->data_len,
1396 ssi->nr_frags);
1397 pr_info("skb 0x%p, lro_cb, csk 0x%p, pdu %u, %u.\n",
1398 skb, lro_cb->csk, lro_cb->pdu_idx, lro_cb->pdu_totallen);
1399
1400 for (i = 0; i < lro_cb->pdu_idx; i++, pdu_cb++)
1401 pr_info("skb 0x%p, pdu %d, %u, f 0x%x, seq 0x%x, dcrc 0x%x, "
1402 "frags %u.\n",
1403 skb, i, pdu_cb->pdulen, pdu_cb->flags, pdu_cb->seq,
1404 pdu_cb->ddigest, pdu_cb->frags);
1405 for (i = 0; i < ssi->nr_frags; i++)
1406 pr_info("skb 0x%p, frag %d, off %u, sz %u.\n",
1407 skb, i, ssi->frags[i].page_offset, ssi->frags[i].size);
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 = hssi->frags[hfrag_idx].size;
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 += hssi->frags[dfrag_idx].size;
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