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) 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, 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); 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 sg_off = data_offset / PAGE_SIZE; 1073 sg_start = &cmd->se_cmd.t_data_sg[sg_off]; 1074 sg_nents = max(1UL, DIV_ROUND_UP(data_len, PAGE_SIZE)); 1075 1076 cxgbit_skb_copy_to_sg(csk->skb, sg_start, sg_nents); 1077 } 1078 1079 check_payload: 1080 1081 rc = iscsit_check_dataout_payload(cmd, hdr, dcrc_err); 1082 if (rc < 0) 1083 return rc; 1084 1085 return 0; 1086 } 1087 1088 static int cxgbit_handle_nop_out(struct cxgbit_sock *csk, struct iscsi_cmd *cmd) 1089 { 1090 struct iscsi_conn *conn = csk->conn; 1091 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb); 1092 struct iscsi_nopout *hdr = (struct iscsi_nopout *)pdu_cb->hdr; 1093 unsigned char *ping_data = NULL; 1094 u32 payload_length = pdu_cb->dlen; 1095 int ret; 1096 1097 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1098 if (ret < 0) 1099 return 0; 1100 1101 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) { 1102 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1103 pr_err("Unable to recover from" 1104 " NOPOUT Ping DataCRC failure while in" 1105 " ERL=0.\n"); 1106 ret = -1; 1107 goto out; 1108 } else { 1109 /* 1110 * drop this PDU and let the 1111 * initiator plug the CmdSN gap. 1112 */ 1113 pr_info("Dropping NOPOUT" 1114 " Command CmdSN: 0x%08x due to" 1115 " DataCRC error.\n", hdr->cmdsn); 1116 ret = 0; 1117 goto out; 1118 } 1119 } 1120 1121 /* 1122 * Handle NOP-OUT payload for traditional iSCSI sockets 1123 */ 1124 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1125 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1126 if (!ping_data) { 1127 pr_err("Unable to allocate memory for" 1128 " NOPOUT ping data.\n"); 1129 ret = -1; 1130 goto out; 1131 } 1132 1133 skb_copy_bits(csk->skb, pdu_cb->doffset, 1134 ping_data, payload_length); 1135 1136 ping_data[payload_length] = '\0'; 1137 /* 1138 * Attach ping data to struct iscsi_cmd->buf_ptr. 1139 */ 1140 cmd->buf_ptr = ping_data; 1141 cmd->buf_ptr_size = payload_length; 1142 1143 pr_debug("Got %u bytes of NOPOUT ping" 1144 " data.\n", payload_length); 1145 pr_debug("Ping Data: \"%s\"\n", ping_data); 1146 } 1147 1148 return iscsit_process_nop_out(conn, cmd, hdr); 1149 out: 1150 if (cmd) 1151 iscsit_free_cmd(cmd, false); 1152 return ret; 1153 } 1154 1155 static int 1156 cxgbit_handle_text_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd) 1157 { 1158 struct iscsi_conn *conn = csk->conn; 1159 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb); 1160 struct iscsi_text *hdr = (struct iscsi_text *)pdu_cb->hdr; 1161 u32 payload_length = pdu_cb->dlen; 1162 int rc; 1163 unsigned char *text_in = NULL; 1164 1165 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 1166 if (rc < 0) 1167 return rc; 1168 1169 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) { 1170 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1171 pr_err("Unable to recover from" 1172 " Text Data digest failure while in" 1173 " ERL=0.\n"); 1174 goto reject; 1175 } else { 1176 /* 1177 * drop this PDU and let the 1178 * initiator plug the CmdSN gap. 1179 */ 1180 pr_info("Dropping Text" 1181 " Command CmdSN: 0x%08x due to" 1182 " DataCRC error.\n", hdr->cmdsn); 1183 return 0; 1184 } 1185 } 1186 1187 if (payload_length) { 1188 text_in = kzalloc(payload_length, GFP_KERNEL); 1189 if (!text_in) { 1190 pr_err("Unable to allocate text_in of payload_length: %u\n", 1191 payload_length); 1192 return -ENOMEM; 1193 } 1194 skb_copy_bits(csk->skb, pdu_cb->doffset, 1195 text_in, payload_length); 1196 1197 text_in[payload_length - 1] = '\0'; 1198 1199 cmd->text_in_ptr = text_in; 1200 } 1201 1202 return iscsit_process_text_cmd(conn, cmd, hdr); 1203 1204 reject: 1205 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1206 pdu_cb->hdr); 1207 } 1208 1209 static int cxgbit_target_rx_opcode(struct cxgbit_sock *csk) 1210 { 1211 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb); 1212 struct iscsi_hdr *hdr = (struct iscsi_hdr *)pdu_cb->hdr; 1213 struct iscsi_conn *conn = csk->conn; 1214 struct iscsi_cmd *cmd = NULL; 1215 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK); 1216 int ret = -EINVAL; 1217 1218 switch (opcode) { 1219 case ISCSI_OP_SCSI_CMD: 1220 cmd = cxgbit_allocate_cmd(csk); 1221 if (!cmd) 1222 goto reject; 1223 1224 ret = cxgbit_handle_scsi_cmd(csk, cmd); 1225 break; 1226 case ISCSI_OP_SCSI_DATA_OUT: 1227 ret = cxgbit_handle_iscsi_dataout(csk); 1228 break; 1229 case ISCSI_OP_NOOP_OUT: 1230 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1231 cmd = cxgbit_allocate_cmd(csk); 1232 if (!cmd) 1233 goto reject; 1234 } 1235 1236 ret = cxgbit_handle_nop_out(csk, cmd); 1237 break; 1238 case ISCSI_OP_SCSI_TMFUNC: 1239 cmd = cxgbit_allocate_cmd(csk); 1240 if (!cmd) 1241 goto reject; 1242 1243 ret = iscsit_handle_task_mgt_cmd(conn, cmd, 1244 (unsigned char *)hdr); 1245 break; 1246 case ISCSI_OP_TEXT: 1247 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1248 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 1249 if (!cmd) 1250 goto reject; 1251 } else { 1252 cmd = cxgbit_allocate_cmd(csk); 1253 if (!cmd) 1254 goto reject; 1255 } 1256 1257 ret = cxgbit_handle_text_cmd(csk, cmd); 1258 break; 1259 case ISCSI_OP_LOGOUT: 1260 cmd = cxgbit_allocate_cmd(csk); 1261 if (!cmd) 1262 goto reject; 1263 1264 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr); 1265 if (ret > 0) 1266 wait_for_completion_timeout(&conn->conn_logout_comp, 1267 SECONDS_FOR_LOGOUT_COMP 1268 * HZ); 1269 break; 1270 case ISCSI_OP_SNACK: 1271 ret = iscsit_handle_snack(conn, (unsigned char *)hdr); 1272 break; 1273 default: 1274 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode); 1275 dump_stack(); 1276 break; 1277 } 1278 1279 return ret; 1280 1281 reject: 1282 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1283 (unsigned char *)hdr); 1284 return ret; 1285 } 1286 1287 static int cxgbit_rx_opcode(struct cxgbit_sock *csk) 1288 { 1289 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb); 1290 struct iscsi_conn *conn = csk->conn; 1291 struct iscsi_hdr *hdr = pdu_cb->hdr; 1292 u8 opcode; 1293 1294 if (pdu_cb->flags & PDUCBF_RX_HCRC_ERR) { 1295 atomic_long_inc(&conn->sess->conn_digest_errors); 1296 goto transport_err; 1297 } 1298 1299 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 1300 goto transport_err; 1301 1302 opcode = hdr->opcode & ISCSI_OPCODE_MASK; 1303 1304 if (conn->sess->sess_ops->SessionType && 1305 ((!(opcode & ISCSI_OP_TEXT)) || 1306 (!(opcode & ISCSI_OP_LOGOUT)))) { 1307 pr_err("Received illegal iSCSI Opcode: 0x%02x" 1308 " while in Discovery Session, rejecting.\n", opcode); 1309 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1310 (unsigned char *)hdr); 1311 goto transport_err; 1312 } 1313 1314 if (cxgbit_target_rx_opcode(csk) < 0) 1315 goto transport_err; 1316 1317 return 0; 1318 1319 transport_err: 1320 return -1; 1321 } 1322 1323 static int cxgbit_rx_login_pdu(struct cxgbit_sock *csk) 1324 { 1325 struct iscsi_conn *conn = csk->conn; 1326 struct iscsi_login *login = conn->login; 1327 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb); 1328 struct iscsi_login_req *login_req; 1329 1330 login_req = (struct iscsi_login_req *)login->req; 1331 memcpy(login_req, pdu_cb->hdr, sizeof(*login_req)); 1332 1333 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," 1334 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n", 1335 login_req->flags, login_req->itt, login_req->cmdsn, 1336 login_req->exp_statsn, login_req->cid, pdu_cb->dlen); 1337 /* 1338 * Setup the initial iscsi_login values from the leading 1339 * login request PDU. 1340 */ 1341 if (login->first_request) { 1342 login_req = (struct iscsi_login_req *)login->req; 1343 login->leading_connection = (!login_req->tsih) ? 1 : 0; 1344 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE( 1345 login_req->flags); 1346 login->version_min = login_req->min_version; 1347 login->version_max = login_req->max_version; 1348 memcpy(login->isid, login_req->isid, 6); 1349 login->cmd_sn = be32_to_cpu(login_req->cmdsn); 1350 login->init_task_tag = login_req->itt; 1351 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); 1352 login->cid = be16_to_cpu(login_req->cid); 1353 login->tsih = be16_to_cpu(login_req->tsih); 1354 } 1355 1356 if (iscsi_target_check_login_request(conn, login) < 0) 1357 return -1; 1358 1359 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS); 1360 skb_copy_bits(csk->skb, pdu_cb->doffset, login->req_buf, pdu_cb->dlen); 1361 1362 return 0; 1363 } 1364 1365 static int 1366 cxgbit_process_iscsi_pdu(struct cxgbit_sock *csk, struct sk_buff *skb, int idx) 1367 { 1368 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, idx); 1369 int ret; 1370 1371 cxgbit_rx_pdu_cb(skb) = pdu_cb; 1372 1373 csk->skb = skb; 1374 1375 if (!test_bit(CSK_LOGIN_DONE, &csk->com.flags)) { 1376 ret = cxgbit_rx_login_pdu(csk); 1377 set_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags); 1378 } else { 1379 ret = cxgbit_rx_opcode(csk); 1380 } 1381 1382 return ret; 1383 } 1384 1385 static void cxgbit_lro_skb_dump(struct sk_buff *skb) 1386 { 1387 struct skb_shared_info *ssi = skb_shinfo(skb); 1388 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb); 1389 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0); 1390 u8 i; 1391 1392 pr_info("skb 0x%p, head 0x%p, 0x%p, len %u,%u, frags %u.\n", 1393 skb, skb->head, skb->data, skb->len, skb->data_len, 1394 ssi->nr_frags); 1395 pr_info("skb 0x%p, lro_cb, csk 0x%p, pdu %u, %u.\n", 1396 skb, lro_cb->csk, lro_cb->pdu_idx, lro_cb->pdu_totallen); 1397 1398 for (i = 0; i < lro_cb->pdu_idx; i++, pdu_cb++) 1399 pr_info("skb 0x%p, pdu %d, %u, f 0x%x, seq 0x%x, dcrc 0x%x, " 1400 "frags %u.\n", 1401 skb, i, pdu_cb->pdulen, pdu_cb->flags, pdu_cb->seq, 1402 pdu_cb->ddigest, pdu_cb->frags); 1403 for (i = 0; i < ssi->nr_frags; i++) 1404 pr_info("skb 0x%p, frag %d, off %u, sz %u.\n", 1405 skb, i, ssi->frags[i].page_offset, ssi->frags[i].size); 1406 } 1407 1408 static void cxgbit_lro_hskb_reset(struct cxgbit_sock *csk) 1409 { 1410 struct sk_buff *skb = csk->lro_hskb; 1411 struct skb_shared_info *ssi = skb_shinfo(skb); 1412 u8 i; 1413 1414 memset(skb->data, 0, LRO_SKB_MIN_HEADROOM); 1415 for (i = 0; i < ssi->nr_frags; i++) 1416 put_page(skb_frag_page(&ssi->frags[i])); 1417 ssi->nr_frags = 0; 1418 skb->data_len = 0; 1419 skb->truesize -= skb->len; 1420 skb->len = 0; 1421 } 1422 1423 static void 1424 cxgbit_lro_skb_merge(struct cxgbit_sock *csk, struct sk_buff *skb, u8 pdu_idx) 1425 { 1426 struct sk_buff *hskb = csk->lro_hskb; 1427 struct cxgbit_lro_pdu_cb *hpdu_cb = cxgbit_skb_lro_pdu_cb(hskb, 0); 1428 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, pdu_idx); 1429 struct skb_shared_info *hssi = skb_shinfo(hskb); 1430 struct skb_shared_info *ssi = skb_shinfo(skb); 1431 unsigned int len = 0; 1432 1433 if (pdu_cb->flags & PDUCBF_RX_HDR) { 1434 u8 hfrag_idx = hssi->nr_frags; 1435 1436 hpdu_cb->flags |= pdu_cb->flags; 1437 hpdu_cb->seq = pdu_cb->seq; 1438 hpdu_cb->hdr = pdu_cb->hdr; 1439 hpdu_cb->hlen = pdu_cb->hlen; 1440 1441 memcpy(&hssi->frags[hfrag_idx], &ssi->frags[pdu_cb->hfrag_idx], 1442 sizeof(skb_frag_t)); 1443 1444 get_page(skb_frag_page(&hssi->frags[hfrag_idx])); 1445 hssi->nr_frags++; 1446 hpdu_cb->frags++; 1447 hpdu_cb->hfrag_idx = hfrag_idx; 1448 1449 len = hssi->frags[hfrag_idx].size; 1450 hskb->len += len; 1451 hskb->data_len += len; 1452 hskb->truesize += len; 1453 } 1454 1455 if (pdu_cb->flags & PDUCBF_RX_DATA) { 1456 u8 dfrag_idx = hssi->nr_frags, i; 1457 1458 hpdu_cb->flags |= pdu_cb->flags; 1459 hpdu_cb->dfrag_idx = dfrag_idx; 1460 1461 len = 0; 1462 for (i = 0; i < pdu_cb->nr_dfrags; dfrag_idx++, i++) { 1463 memcpy(&hssi->frags[dfrag_idx], 1464 &ssi->frags[pdu_cb->dfrag_idx + i], 1465 sizeof(skb_frag_t)); 1466 1467 get_page(skb_frag_page(&hssi->frags[dfrag_idx])); 1468 1469 len += hssi->frags[dfrag_idx].size; 1470 1471 hssi->nr_frags++; 1472 hpdu_cb->frags++; 1473 } 1474 1475 hpdu_cb->dlen = pdu_cb->dlen; 1476 hpdu_cb->doffset = hpdu_cb->hlen; 1477 hpdu_cb->nr_dfrags = pdu_cb->nr_dfrags; 1478 hskb->len += len; 1479 hskb->data_len += len; 1480 hskb->truesize += len; 1481 } 1482 1483 if (pdu_cb->flags & PDUCBF_RX_STATUS) { 1484 hpdu_cb->flags |= pdu_cb->flags; 1485 1486 if (hpdu_cb->flags & PDUCBF_RX_DATA) 1487 hpdu_cb->flags &= ~PDUCBF_RX_DATA_DDPD; 1488 1489 hpdu_cb->ddigest = pdu_cb->ddigest; 1490 hpdu_cb->pdulen = pdu_cb->pdulen; 1491 } 1492 } 1493 1494 static int cxgbit_process_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb) 1495 { 1496 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb); 1497 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0); 1498 u8 pdu_idx = 0, last_idx = 0; 1499 int ret = 0; 1500 1501 if (!pdu_cb->complete) { 1502 cxgbit_lro_skb_merge(csk, skb, 0); 1503 1504 if (pdu_cb->flags & PDUCBF_RX_STATUS) { 1505 struct sk_buff *hskb = csk->lro_hskb; 1506 1507 ret = cxgbit_process_iscsi_pdu(csk, hskb, 0); 1508 1509 cxgbit_lro_hskb_reset(csk); 1510 1511 if (ret < 0) 1512 goto out; 1513 } 1514 1515 pdu_idx = 1; 1516 } 1517 1518 if (lro_cb->pdu_idx) 1519 last_idx = lro_cb->pdu_idx - 1; 1520 1521 for (; pdu_idx <= last_idx; pdu_idx++) { 1522 ret = cxgbit_process_iscsi_pdu(csk, skb, pdu_idx); 1523 if (ret < 0) 1524 goto out; 1525 } 1526 1527 if ((!lro_cb->complete) && lro_cb->pdu_idx) 1528 cxgbit_lro_skb_merge(csk, skb, lro_cb->pdu_idx); 1529 1530 out: 1531 return ret; 1532 } 1533 1534 static int cxgbit_rx_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb) 1535 { 1536 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb); 1537 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0); 1538 int ret = -1; 1539 1540 if ((pdu_cb->flags & PDUCBF_RX_HDR) && 1541 (pdu_cb->seq != csk->rcv_nxt)) { 1542 pr_info("csk 0x%p, tid 0x%x, seq 0x%x != 0x%x.\n", 1543 csk, csk->tid, pdu_cb->seq, csk->rcv_nxt); 1544 cxgbit_lro_skb_dump(skb); 1545 return ret; 1546 } 1547 1548 csk->rcv_nxt += lro_cb->pdu_totallen; 1549 1550 ret = cxgbit_process_lro_skb(csk, skb); 1551 1552 csk->rx_credits += lro_cb->pdu_totallen; 1553 1554 if (csk->rx_credits >= (csk->rcv_win / 4)) 1555 cxgbit_rx_data_ack(csk); 1556 1557 return ret; 1558 } 1559 1560 static int cxgbit_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb) 1561 { 1562 struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi; 1563 int ret = -1; 1564 1565 if (likely(cxgbit_skcb_flags(skb) & SKCBF_RX_LRO)) { 1566 if (is_t5(lldi->adapter_type)) 1567 ret = cxgbit_rx_lro_skb(csk, skb); 1568 else 1569 ret = cxgbit_process_lro_skb(csk, skb); 1570 } 1571 1572 __kfree_skb(skb); 1573 return ret; 1574 } 1575 1576 static bool cxgbit_rxq_len(struct cxgbit_sock *csk, struct sk_buff_head *rxq) 1577 { 1578 spin_lock_bh(&csk->rxq.lock); 1579 if (skb_queue_len(&csk->rxq)) { 1580 skb_queue_splice_init(&csk->rxq, rxq); 1581 spin_unlock_bh(&csk->rxq.lock); 1582 return true; 1583 } 1584 spin_unlock_bh(&csk->rxq.lock); 1585 return false; 1586 } 1587 1588 static int cxgbit_wait_rxq(struct cxgbit_sock *csk) 1589 { 1590 struct sk_buff *skb; 1591 struct sk_buff_head rxq; 1592 1593 skb_queue_head_init(&rxq); 1594 1595 wait_event_interruptible(csk->waitq, cxgbit_rxq_len(csk, &rxq)); 1596 1597 if (signal_pending(current)) 1598 goto out; 1599 1600 while ((skb = __skb_dequeue(&rxq))) { 1601 if (cxgbit_rx_skb(csk, skb)) 1602 goto out; 1603 } 1604 1605 return 0; 1606 out: 1607 __skb_queue_purge(&rxq); 1608 return -1; 1609 } 1610 1611 int cxgbit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) 1612 { 1613 struct cxgbit_sock *csk = conn->context; 1614 int ret = -1; 1615 1616 while (!test_and_clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags)) { 1617 ret = cxgbit_wait_rxq(csk); 1618 if (ret) { 1619 clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags); 1620 break; 1621 } 1622 } 1623 1624 return ret; 1625 } 1626 1627 void cxgbit_get_rx_pdu(struct iscsi_conn *conn) 1628 { 1629 struct cxgbit_sock *csk = conn->context; 1630 1631 while (!kthread_should_stop()) { 1632 iscsit_thread_check_cpumask(conn, current, 0); 1633 if (cxgbit_wait_rxq(csk)) 1634 return; 1635 } 1636 } 1637