1 /*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * Copyright (c) 2015 Chelsio Communications, Inc. 4 * All rights reserved. 5 * 6 * This software was developed by Edward Tomasz Napierala under sponsorship 7 * from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32 /* 33 * cxgbei implementation of iSCSI Common Layer kobj(9) interface. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include "opt_inet.h" 40 #include "opt_inet6.h" 41 42 #ifdef TCP_OFFLOAD 43 #include <sys/param.h> 44 #include <sys/capsicum.h> 45 #include <sys/condvar.h> 46 #include <sys/conf.h> 47 #include <sys/file.h> 48 #include <sys/kernel.h> 49 #include <sys/kthread.h> 50 #include <sys/ktr.h> 51 #include <sys/lock.h> 52 #include <sys/mbuf.h> 53 #include <sys/mutex.h> 54 #include <sys/module.h> 55 #include <sys/protosw.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 #include <sys/sx.h> 61 #include <sys/uio.h> 62 #include <machine/bus.h> 63 #include <vm/vm.h> 64 #include <vm/pmap.h> 65 #include <netinet/in.h> 66 #include <netinet/in_pcb.h> 67 #include <netinet/tcp.h> 68 #include <netinet/tcp_var.h> 69 #include <netinet/toecore.h> 70 71 #include <dev/iscsi/icl.h> 72 #include <dev/iscsi/iscsi_proto.h> 73 #include <icl_conn_if.h> 74 75 #include <cam/scsi/scsi_all.h> 76 #include <cam/scsi/scsi_da.h> 77 #include <cam/ctl/ctl_io.h> 78 #include <cam/ctl/ctl.h> 79 #include <cam/ctl/ctl_backend.h> 80 #include <cam/ctl/ctl_error.h> 81 #include <cam/ctl/ctl_frontend.h> 82 #include <cam/ctl/ctl_debug.h> 83 #include <cam/ctl/ctl_ha.h> 84 #include <cam/ctl/ctl_ioctl.h> 85 86 #include <cam/cam.h> 87 #include <cam/cam_ccb.h> 88 #include <cam/cam_xpt.h> 89 #include <cam/cam_debug.h> 90 #include <cam/cam_sim.h> 91 #include <cam/cam_xpt_sim.h> 92 #include <cam/cam_xpt_periph.h> 93 #include <cam/cam_periph.h> 94 #include <cam/cam_compat.h> 95 #include <cam/scsi/scsi_message.h> 96 97 #include "common/common.h" 98 #include "common/t4_tcb.h" 99 #include "tom/t4_tom.h" 100 #include "cxgbei.h" 101 102 /* 103 * Use the page pod tag for the TT hash. 104 */ 105 #define TT_HASH(icc, tt) (G_PPOD_TAG(tt) & (icc)->cmp_hash_mask) 106 107 struct cxgbei_ddp_state { 108 struct ppod_reservation prsv; 109 struct cxgbei_cmp cmp; 110 }; 111 112 static MALLOC_DEFINE(M_CXGBEI, "cxgbei", "cxgbei(4)"); 113 114 SYSCTL_NODE(_kern_icl, OID_AUTO, cxgbei, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 115 "Chelsio iSCSI offload"); 116 static int first_burst_length = 8192; 117 SYSCTL_INT(_kern_icl_cxgbei, OID_AUTO, first_burst_length, CTLFLAG_RWTUN, 118 &first_burst_length, 0, "First burst length"); 119 static int max_burst_length = 2 * 1024 * 1024; 120 SYSCTL_INT(_kern_icl_cxgbei, OID_AUTO, max_burst_length, CTLFLAG_RWTUN, 121 &max_burst_length, 0, "Maximum burst length"); 122 static int sendspace = 1048576; 123 SYSCTL_INT(_kern_icl_cxgbei, OID_AUTO, sendspace, CTLFLAG_RWTUN, 124 &sendspace, 0, "Default send socket buffer size"); 125 static int recvspace = 1048576; 126 SYSCTL_INT(_kern_icl_cxgbei, OID_AUTO, recvspace, CTLFLAG_RWTUN, 127 &recvspace, 0, "Default receive socket buffer size"); 128 129 static volatile u_int icl_cxgbei_ncons; 130 131 #define ICL_CONN_LOCK(X) mtx_lock(X->ic_lock) 132 #define ICL_CONN_UNLOCK(X) mtx_unlock(X->ic_lock) 133 #define ICL_CONN_LOCK_ASSERT(X) mtx_assert(X->ic_lock, MA_OWNED) 134 #define ICL_CONN_LOCK_ASSERT_NOT(X) mtx_assert(X->ic_lock, MA_NOTOWNED) 135 136 static icl_conn_new_pdu_t icl_cxgbei_conn_new_pdu; 137 static icl_conn_pdu_data_segment_length_t 138 icl_cxgbei_conn_pdu_data_segment_length; 139 static icl_conn_pdu_append_data_t icl_cxgbei_conn_pdu_append_data; 140 static icl_conn_pdu_get_data_t icl_cxgbei_conn_pdu_get_data; 141 static icl_conn_pdu_queue_t icl_cxgbei_conn_pdu_queue; 142 static icl_conn_pdu_queue_cb_t icl_cxgbei_conn_pdu_queue_cb; 143 static icl_conn_handoff_t icl_cxgbei_conn_handoff; 144 static icl_conn_free_t icl_cxgbei_conn_free; 145 static icl_conn_close_t icl_cxgbei_conn_close; 146 static icl_conn_task_setup_t icl_cxgbei_conn_task_setup; 147 static icl_conn_task_done_t icl_cxgbei_conn_task_done; 148 static icl_conn_transfer_setup_t icl_cxgbei_conn_transfer_setup; 149 static icl_conn_transfer_done_t icl_cxgbei_conn_transfer_done; 150 151 static kobj_method_t icl_cxgbei_methods[] = { 152 KOBJMETHOD(icl_conn_new_pdu, icl_cxgbei_conn_new_pdu), 153 KOBJMETHOD(icl_conn_pdu_free, icl_cxgbei_conn_pdu_free), 154 KOBJMETHOD(icl_conn_pdu_data_segment_length, 155 icl_cxgbei_conn_pdu_data_segment_length), 156 KOBJMETHOD(icl_conn_pdu_append_data, icl_cxgbei_conn_pdu_append_data), 157 KOBJMETHOD(icl_conn_pdu_get_data, icl_cxgbei_conn_pdu_get_data), 158 KOBJMETHOD(icl_conn_pdu_queue, icl_cxgbei_conn_pdu_queue), 159 KOBJMETHOD(icl_conn_pdu_queue_cb, icl_cxgbei_conn_pdu_queue_cb), 160 KOBJMETHOD(icl_conn_handoff, icl_cxgbei_conn_handoff), 161 KOBJMETHOD(icl_conn_free, icl_cxgbei_conn_free), 162 KOBJMETHOD(icl_conn_close, icl_cxgbei_conn_close), 163 KOBJMETHOD(icl_conn_task_setup, icl_cxgbei_conn_task_setup), 164 KOBJMETHOD(icl_conn_task_done, icl_cxgbei_conn_task_done), 165 KOBJMETHOD(icl_conn_transfer_setup, icl_cxgbei_conn_transfer_setup), 166 KOBJMETHOD(icl_conn_transfer_done, icl_cxgbei_conn_transfer_done), 167 { 0, 0 } 168 }; 169 170 DEFINE_CLASS(icl_cxgbei, icl_cxgbei_methods, sizeof(struct icl_cxgbei_conn)); 171 172 void 173 icl_cxgbei_conn_pdu_free(struct icl_conn *ic, struct icl_pdu *ip) 174 { 175 struct icl_cxgbei_pdu *icp = ip_to_icp(ip); 176 177 KASSERT(icp->ref_cnt != 0, ("freeing deleted PDU")); 178 MPASS(icp->icp_signature == CXGBEI_PDU_SIGNATURE); 179 MPASS(ic == ip->ip_conn); 180 181 m_freem(ip->ip_ahs_mbuf); 182 m_freem(ip->ip_data_mbuf); 183 m_freem(ip->ip_bhs_mbuf); 184 185 KASSERT(ic != NULL || icp->ref_cnt == 1, 186 ("orphaned PDU has oustanding references")); 187 188 if (atomic_fetchadd_int(&icp->ref_cnt, -1) != 1) 189 return; 190 191 free(icp, M_CXGBEI); 192 #ifdef DIAGNOSTIC 193 if (__predict_true(ic != NULL)) 194 refcount_release(&ic->ic_outstanding_pdus); 195 #endif 196 } 197 198 static void 199 icl_cxgbei_pdu_call_cb(struct icl_pdu *ip) 200 { 201 struct icl_cxgbei_pdu *icp = ip_to_icp(ip); 202 203 MPASS(icp->icp_signature == CXGBEI_PDU_SIGNATURE); 204 205 if (icp->cb != NULL) 206 icp->cb(ip, icp->error); 207 #ifdef DIAGNOSTIC 208 if (__predict_true(ip->ip_conn != NULL)) 209 refcount_release(&ip->ip_conn->ic_outstanding_pdus); 210 #endif 211 free(icp, M_CXGBEI); 212 } 213 214 static void 215 icl_cxgbei_pdu_done(struct icl_pdu *ip, int error) 216 { 217 struct icl_cxgbei_pdu *icp = ip_to_icp(ip); 218 219 if (error != 0) 220 icp->error = error; 221 222 m_freem(ip->ip_ahs_mbuf); 223 ip->ip_ahs_mbuf = NULL; 224 m_freem(ip->ip_data_mbuf); 225 ip->ip_data_mbuf = NULL; 226 m_freem(ip->ip_bhs_mbuf); 227 ip->ip_bhs_mbuf = NULL; 228 229 /* 230 * All other references to this PDU should have been dropped 231 * by the m_freem() of ip_data_mbuf. 232 */ 233 if (atomic_fetchadd_int(&icp->ref_cnt, -1) == 1) 234 icl_cxgbei_pdu_call_cb(ip); 235 else 236 __assert_unreachable(); 237 } 238 239 static void 240 icl_cxgbei_mbuf_done(struct mbuf *mb) 241 { 242 243 struct icl_cxgbei_pdu *icp = (struct icl_cxgbei_pdu *)mb->m_ext.ext_arg1; 244 245 /* 246 * NB: mb_free_mext() might leave ref_cnt as 1 without 247 * decrementing it if it hits the fast path in the ref_cnt 248 * check. 249 */ 250 icl_cxgbei_pdu_call_cb(&icp->ip); 251 } 252 253 struct icl_pdu * 254 icl_cxgbei_new_pdu(int flags) 255 { 256 struct icl_cxgbei_pdu *icp; 257 struct icl_pdu *ip; 258 struct mbuf *m; 259 260 icp = malloc(sizeof(*icp), M_CXGBEI, flags | M_ZERO); 261 if (__predict_false(icp == NULL)) 262 return (NULL); 263 264 icp->icp_signature = CXGBEI_PDU_SIGNATURE; 265 icp->ref_cnt = 1; 266 ip = &icp->ip; 267 268 m = m_gethdr(flags, MT_DATA); 269 if (__predict_false(m == NULL)) { 270 free(icp, M_CXGBEI); 271 return (NULL); 272 } 273 274 ip->ip_bhs_mbuf = m; 275 ip->ip_bhs = mtod(m, struct iscsi_bhs *); 276 memset(ip->ip_bhs, 0, sizeof(*ip->ip_bhs)); 277 m->m_len = sizeof(struct iscsi_bhs); 278 m->m_pkthdr.len = m->m_len; 279 280 return (ip); 281 } 282 283 void 284 icl_cxgbei_new_pdu_set_conn(struct icl_pdu *ip, struct icl_conn *ic) 285 { 286 287 ip->ip_conn = ic; 288 #ifdef DIAGNOSTIC 289 refcount_acquire(&ic->ic_outstanding_pdus); 290 #endif 291 } 292 293 /* 294 * Allocate icl_pdu with empty BHS to fill up by the caller. 295 */ 296 static struct icl_pdu * 297 icl_cxgbei_conn_new_pdu(struct icl_conn *ic, int flags) 298 { 299 struct icl_pdu *ip; 300 301 ip = icl_cxgbei_new_pdu(flags); 302 if (__predict_false(ip == NULL)) 303 return (NULL); 304 icl_cxgbei_new_pdu_set_conn(ip, ic); 305 306 return (ip); 307 } 308 309 static size_t 310 icl_pdu_data_segment_length(const struct icl_pdu *request) 311 { 312 uint32_t len = 0; 313 314 len += request->ip_bhs->bhs_data_segment_len[0]; 315 len <<= 8; 316 len += request->ip_bhs->bhs_data_segment_len[1]; 317 len <<= 8; 318 len += request->ip_bhs->bhs_data_segment_len[2]; 319 320 return (len); 321 } 322 323 size_t 324 icl_cxgbei_conn_pdu_data_segment_length(struct icl_conn *ic, 325 const struct icl_pdu *request) 326 { 327 328 return (icl_pdu_data_segment_length(request)); 329 } 330 331 static struct mbuf * 332 finalize_pdu(struct icl_cxgbei_conn *icc, struct icl_cxgbei_pdu *icp) 333 { 334 struct icl_pdu *ip = &icp->ip; 335 uint8_t ulp_submode, padding; 336 struct mbuf *m, *last; 337 struct iscsi_bhs *bhs; 338 339 /* 340 * Fix up the data segment mbuf first. 341 */ 342 m = ip->ip_data_mbuf; 343 ulp_submode = icc->ulp_submode; 344 if (m) { 345 last = m_last(m); 346 347 /* 348 * Round up the data segment to a 4B boundary. Pad with 0 if 349 * necessary. There will definitely be room in the mbuf. 350 */ 351 padding = roundup2(ip->ip_data_len, 4) - ip->ip_data_len; 352 if (padding) { 353 bzero(mtod(last, uint8_t *) + last->m_len, padding); 354 last->m_len += padding; 355 } 356 } else { 357 MPASS(ip->ip_data_len == 0); 358 ulp_submode &= ~ULP_CRC_DATA; 359 padding = 0; 360 } 361 362 /* 363 * Now the header mbuf that has the BHS. 364 */ 365 m = ip->ip_bhs_mbuf; 366 MPASS(m->m_pkthdr.len == sizeof(struct iscsi_bhs)); 367 MPASS(m->m_len == sizeof(struct iscsi_bhs)); 368 369 bhs = ip->ip_bhs; 370 bhs->bhs_data_segment_len[2] = ip->ip_data_len; 371 bhs->bhs_data_segment_len[1] = ip->ip_data_len >> 8; 372 bhs->bhs_data_segment_len[0] = ip->ip_data_len >> 16; 373 374 /* 375 * Extract mbuf chain from PDU. 376 */ 377 m->m_pkthdr.len += ip->ip_data_len + padding; 378 m->m_next = ip->ip_data_mbuf; 379 set_mbuf_ulp_submode(m, ulp_submode); 380 ip->ip_bhs_mbuf = NULL; 381 ip->ip_data_mbuf = NULL; 382 ip->ip_bhs = NULL; 383 384 /* 385 * Drop PDU reference on icp. Additional references might 386 * still be held by zero-copy PDU buffers (ICL_NOCOPY). 387 */ 388 if (atomic_fetchadd_int(&icp->ref_cnt, -1) == 1) 389 icl_cxgbei_pdu_call_cb(ip); 390 391 return (m); 392 } 393 394 int 395 icl_cxgbei_conn_pdu_append_data(struct icl_conn *ic, struct icl_pdu *ip, 396 const void *addr, size_t len, int flags) 397 { 398 struct icl_cxgbei_pdu *icp = ip_to_icp(ip); 399 struct mbuf *m, *m_tail; 400 const char *src; 401 402 MPASS(icp->icp_signature == CXGBEI_PDU_SIGNATURE); 403 MPASS(ic == ip->ip_conn); 404 KASSERT(len > 0, ("%s: len is %jd", __func__, (intmax_t)len)); 405 406 m_tail = ip->ip_data_mbuf; 407 if (m_tail != NULL) 408 for (; m_tail->m_next != NULL; m_tail = m_tail->m_next) 409 ; 410 411 if (flags & ICL_NOCOPY) { 412 m = m_get(flags & ~ICL_NOCOPY, MT_DATA); 413 if (m == NULL) { 414 ICL_WARN("failed to allocate mbuf"); 415 return (ENOMEM); 416 } 417 418 m->m_flags |= M_RDONLY; 419 m_extaddref(m, __DECONST(char *, addr), len, &icp->ref_cnt, 420 icl_cxgbei_mbuf_done, icp, NULL); 421 m->m_len = len; 422 if (ip->ip_data_mbuf == NULL) { 423 ip->ip_data_mbuf = m; 424 ip->ip_data_len = len; 425 } else { 426 m_tail->m_next = m; 427 m_tail = m_tail->m_next; 428 ip->ip_data_len += len; 429 } 430 431 return (0); 432 } 433 434 src = (const char *)addr; 435 436 /* Allocate as jumbo mbufs of size MJUM16BYTES. */ 437 while (len >= MJUM16BYTES) { 438 m = m_getjcl(M_NOWAIT, MT_DATA, 0, MJUM16BYTES); 439 if (__predict_false(m == NULL)) { 440 if ((flags & M_WAITOK) != 0) { 441 /* Fall back to non-jumbo mbufs. */ 442 break; 443 } 444 return (ENOMEM); 445 } 446 memcpy(mtod(m, void *), src, MJUM16BYTES); 447 m->m_len = MJUM16BYTES; 448 if (ip->ip_data_mbuf == NULL) { 449 ip->ip_data_mbuf = m_tail = m; 450 ip->ip_data_len = MJUM16BYTES; 451 } else { 452 m_tail->m_next = m; 453 m_tail = m_tail->m_next; 454 ip->ip_data_len += MJUM16BYTES; 455 } 456 src += MJUM16BYTES; 457 len -= MJUM16BYTES; 458 } 459 460 /* Allocate mbuf chain for the remaining data. */ 461 if (len != 0) { 462 m = m_getm2(NULL, len, flags, MT_DATA, 0); 463 if (__predict_false(m == NULL)) 464 return (ENOMEM); 465 if (ip->ip_data_mbuf == NULL) { 466 ip->ip_data_mbuf = m; 467 ip->ip_data_len = len; 468 } else { 469 m_tail->m_next = m; 470 ip->ip_data_len += len; 471 } 472 for (; m != NULL; m = m->m_next) { 473 m->m_len = min(len, M_SIZE(m)); 474 memcpy(mtod(m, void *), src, m->m_len); 475 src += m->m_len; 476 len -= m->m_len; 477 } 478 MPASS(len == 0); 479 } 480 MPASS(ip->ip_data_len <= ic->ic_max_send_data_segment_length); 481 482 return (0); 483 } 484 485 void 486 icl_cxgbei_conn_pdu_get_data(struct icl_conn *ic, struct icl_pdu *ip, 487 size_t off, void *addr, size_t len) 488 { 489 struct icl_cxgbei_pdu *icp = ip_to_icp(ip); 490 491 if (icp->icp_flags & ICPF_RX_DDP) 492 return; /* data is DDP'ed, no need to copy */ 493 m_copydata(ip->ip_data_mbuf, off, len, addr); 494 } 495 496 void 497 icl_cxgbei_conn_pdu_queue(struct icl_conn *ic, struct icl_pdu *ip) 498 { 499 icl_cxgbei_conn_pdu_queue_cb(ic, ip, NULL); 500 } 501 502 void 503 icl_cxgbei_conn_pdu_queue_cb(struct icl_conn *ic, struct icl_pdu *ip, 504 icl_pdu_cb cb) 505 { 506 struct epoch_tracker et; 507 struct icl_cxgbei_conn *icc = ic_to_icc(ic); 508 struct icl_cxgbei_pdu *icp = ip_to_icp(ip); 509 struct socket *so = ic->ic_socket; 510 struct toepcb *toep = icc->toep; 511 struct inpcb *inp; 512 struct mbuf *m; 513 514 MPASS(ic == ip->ip_conn); 515 MPASS(ip->ip_bhs_mbuf != NULL); 516 /* The kernel doesn't generate PDUs with AHS. */ 517 MPASS(ip->ip_ahs_mbuf == NULL && ip->ip_ahs_len == 0); 518 519 ICL_CONN_LOCK_ASSERT(ic); 520 521 icp->cb = cb; 522 523 /* NOTE: sowriteable without so_snd lock is a mostly harmless race. */ 524 if (ic->ic_disconnecting || so == NULL || !sowriteable(so)) { 525 icl_cxgbei_pdu_done(ip, ENOTCONN); 526 return; 527 } 528 529 m = finalize_pdu(icc, icp); 530 M_ASSERTPKTHDR(m); 531 MPASS((m->m_pkthdr.len & 3) == 0); 532 533 /* 534 * Do not get inp from toep->inp as the toepcb might have detached 535 * already. 536 */ 537 inp = sotoinpcb(so); 538 CURVNET_SET(toep->vnet); 539 NET_EPOCH_ENTER(et); 540 INP_WLOCK(inp); 541 if (__predict_false(inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) || 542 __predict_false((toep->flags & TPF_ATTACHED) == 0)) 543 m_freem(m); 544 else { 545 mbufq_enqueue(&toep->ulp_pduq, m); 546 t4_push_pdus(icc->sc, toep, 0); 547 } 548 INP_WUNLOCK(inp); 549 NET_EPOCH_EXIT(et); 550 CURVNET_RESTORE(); 551 } 552 553 static struct icl_conn * 554 icl_cxgbei_new_conn(const char *name, struct mtx *lock) 555 { 556 struct icl_cxgbei_conn *icc; 557 struct icl_conn *ic; 558 559 refcount_acquire(&icl_cxgbei_ncons); 560 561 icc = (struct icl_cxgbei_conn *)kobj_create(&icl_cxgbei_class, M_CXGBE, 562 M_WAITOK | M_ZERO); 563 icc->icc_signature = CXGBEI_CONN_SIGNATURE; 564 STAILQ_INIT(&icc->rcvd_pdus); 565 566 icc->cmp_table = hashinit(64, M_CXGBEI, &icc->cmp_hash_mask); 567 mtx_init(&icc->cmp_lock, "cxgbei_cmp", NULL, MTX_DEF); 568 569 ic = &icc->ic; 570 ic->ic_lock = lock; 571 572 /* XXXNP: review. Most of these icl_conn fields aren't really used */ 573 STAILQ_INIT(&ic->ic_to_send); 574 cv_init(&ic->ic_send_cv, "icl_cxgbei_tx"); 575 cv_init(&ic->ic_receive_cv, "icl_cxgbei_rx"); 576 #ifdef DIAGNOSTIC 577 refcount_init(&ic->ic_outstanding_pdus, 0); 578 #endif 579 ic->ic_name = name; 580 ic->ic_offload = "cxgbei"; 581 ic->ic_unmapped = false; 582 583 CTR2(KTR_CXGBE, "%s: icc %p", __func__, icc); 584 585 return (ic); 586 } 587 588 void 589 icl_cxgbei_conn_free(struct icl_conn *ic) 590 { 591 struct icl_cxgbei_conn *icc = ic_to_icc(ic); 592 593 MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE); 594 595 CTR2(KTR_CXGBE, "%s: icc %p", __func__, icc); 596 597 cv_destroy(&ic->ic_send_cv); 598 cv_destroy(&ic->ic_receive_cv); 599 600 mtx_destroy(&icc->cmp_lock); 601 hashdestroy(icc->cmp_table, M_CXGBEI, icc->cmp_hash_mask); 602 kobj_delete((struct kobj *)icc, M_CXGBE); 603 refcount_release(&icl_cxgbei_ncons); 604 } 605 606 static int 607 icl_cxgbei_setsockopt(struct icl_conn *ic, struct socket *so, int sspace, 608 int rspace) 609 { 610 struct sockopt opt; 611 int error, one = 1, ss, rs; 612 613 ss = max(sendspace, sspace); 614 rs = max(recvspace, rspace); 615 616 error = soreserve(so, ss, rs); 617 if (error != 0) { 618 icl_cxgbei_conn_close(ic); 619 return (error); 620 } 621 SOCKBUF_LOCK(&so->so_snd); 622 so->so_snd.sb_flags |= SB_AUTOSIZE; 623 SOCKBUF_UNLOCK(&so->so_snd); 624 SOCKBUF_LOCK(&so->so_rcv); 625 so->so_rcv.sb_flags |= SB_AUTOSIZE; 626 SOCKBUF_UNLOCK(&so->so_rcv); 627 628 /* 629 * Disable Nagle. 630 */ 631 bzero(&opt, sizeof(opt)); 632 opt.sopt_dir = SOPT_SET; 633 opt.sopt_level = IPPROTO_TCP; 634 opt.sopt_name = TCP_NODELAY; 635 opt.sopt_val = &one; 636 opt.sopt_valsize = sizeof(one); 637 error = sosetopt(so, &opt); 638 if (error != 0) { 639 icl_cxgbei_conn_close(ic); 640 return (error); 641 } 642 643 return (0); 644 } 645 646 /* 647 * Request/response structure used to find out the adapter offloading a socket. 648 */ 649 struct find_ofld_adapter_rr { 650 struct socket *so; 651 struct adapter *sc; /* result */ 652 }; 653 654 static void 655 find_offload_adapter(struct adapter *sc, void *arg) 656 { 657 struct find_ofld_adapter_rr *fa = arg; 658 struct socket *so = fa->so; 659 struct tom_data *td = sc->tom_softc; 660 struct tcpcb *tp; 661 struct inpcb *inp; 662 663 /* Non-TCP were filtered out earlier. */ 664 MPASS(so->so_proto->pr_protocol == IPPROTO_TCP); 665 666 if (fa->sc != NULL) 667 return; /* Found already. */ 668 669 if (td == NULL) 670 return; /* TOE not enabled on this adapter. */ 671 672 inp = sotoinpcb(so); 673 INP_WLOCK(inp); 674 if ((inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) == 0) { 675 tp = intotcpcb(inp); 676 if (tp->t_flags & TF_TOE && tp->tod == &td->tod) 677 fa->sc = sc; /* Found. */ 678 } 679 INP_WUNLOCK(inp); 680 } 681 682 /* XXXNP: move this to t4_tom. */ 683 static void 684 send_iscsi_flowc_wr(struct adapter *sc, struct toepcb *toep, int maxlen) 685 { 686 struct wrqe *wr; 687 struct fw_flowc_wr *flowc; 688 const u_int nparams = 1; 689 u_int flowclen; 690 struct ofld_tx_sdesc *txsd = &toep->txsd[toep->txsd_pidx]; 691 692 flowclen = sizeof(*flowc) + nparams * sizeof(struct fw_flowc_mnemval); 693 694 wr = alloc_wrqe(roundup2(flowclen, 16), &toep->ofld_txq->wrq); 695 if (wr == NULL) { 696 /* XXX */ 697 panic("%s: allocation failure.", __func__); 698 } 699 flowc = wrtod(wr); 700 memset(flowc, 0, wr->wr_len); 701 702 flowc->op_to_nparams = htobe32(V_FW_WR_OP(FW_FLOWC_WR) | 703 V_FW_FLOWC_WR_NPARAMS(nparams)); 704 flowc->flowid_len16 = htonl(V_FW_WR_LEN16(howmany(flowclen, 16)) | 705 V_FW_WR_FLOWID(toep->tid)); 706 707 flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX; 708 flowc->mnemval[0].val = htobe32(maxlen); 709 710 txsd->tx_credits = howmany(flowclen, 16); 711 txsd->plen = 0; 712 KASSERT(toep->tx_credits >= txsd->tx_credits && toep->txsd_avail > 0, 713 ("%s: not enough credits (%d)", __func__, toep->tx_credits)); 714 toep->tx_credits -= txsd->tx_credits; 715 if (__predict_false(++toep->txsd_pidx == toep->txsd_total)) 716 toep->txsd_pidx = 0; 717 toep->txsd_avail--; 718 719 t4_wrq_tx(sc, wr); 720 } 721 722 static void 723 set_ulp_mode_iscsi(struct adapter *sc, struct toepcb *toep, u_int ulp_submode) 724 { 725 uint64_t val; 726 727 CTR3(KTR_CXGBE, "%s: tid %u, ULP_MODE_ISCSI, submode=%#x", 728 __func__, toep->tid, ulp_submode); 729 730 val = V_TCB_ULP_TYPE(ULP_MODE_ISCSI) | V_TCB_ULP_RAW(ulp_submode); 731 t4_set_tcb_field(sc, toep->ctrlq, toep, W_TCB_ULP_TYPE, 732 V_TCB_ULP_TYPE(M_TCB_ULP_TYPE) | V_TCB_ULP_RAW(M_TCB_ULP_RAW), val, 733 0, 0); 734 735 val = V_TF_RX_FLOW_CONTROL_DISABLE(1ULL); 736 t4_set_tcb_field(sc, toep->ctrlq, toep, W_TCB_T_FLAGS, val, val, 0, 0); 737 } 738 739 /* 740 * XXXNP: Who is responsible for cleaning up the socket if this returns with an 741 * error? Review all error paths. 742 * 743 * XXXNP: What happens to the socket's fd reference if the operation is 744 * successful, and how does that affect the socket's life cycle? 745 */ 746 int 747 icl_cxgbei_conn_handoff(struct icl_conn *ic, int fd) 748 { 749 struct icl_cxgbei_conn *icc = ic_to_icc(ic); 750 struct cxgbei_data *ci; 751 struct find_ofld_adapter_rr fa; 752 struct file *fp; 753 struct socket *so; 754 struct inpcb *inp; 755 struct tcpcb *tp; 756 struct toepcb *toep; 757 cap_rights_t rights; 758 int error; 759 760 MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE); 761 ICL_CONN_LOCK_ASSERT_NOT(ic); 762 763 /* 764 * Steal the socket from userland. 765 */ 766 error = fget(curthread, fd, 767 cap_rights_init_one(&rights, CAP_SOCK_CLIENT), &fp); 768 if (error != 0) 769 return (error); 770 if (fp->f_type != DTYPE_SOCKET) { 771 fdrop(fp, curthread); 772 return (EINVAL); 773 } 774 so = fp->f_data; 775 if (so->so_type != SOCK_STREAM || 776 so->so_proto->pr_protocol != IPPROTO_TCP) { 777 fdrop(fp, curthread); 778 return (EINVAL); 779 } 780 781 ICL_CONN_LOCK(ic); 782 if (ic->ic_socket != NULL) { 783 ICL_CONN_UNLOCK(ic); 784 fdrop(fp, curthread); 785 return (EBUSY); 786 } 787 ic->ic_disconnecting = false; 788 ic->ic_socket = so; 789 fp->f_ops = &badfileops; 790 fp->f_data = NULL; 791 fdrop(fp, curthread); 792 ICL_CONN_UNLOCK(ic); 793 794 /* Find the adapter offloading this socket. */ 795 fa.sc = NULL; 796 fa.so = so; 797 t4_iterate(find_offload_adapter, &fa); 798 if (fa.sc == NULL) 799 return (EINVAL); 800 icc->sc = fa.sc; 801 ci = icc->sc->iscsi_ulp_softc; 802 803 inp = sotoinpcb(so); 804 INP_WLOCK(inp); 805 tp = intotcpcb(inp); 806 if (inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) 807 error = EBUSY; 808 else { 809 /* 810 * socket could not have been "unoffloaded" if here. 811 */ 812 MPASS(tp->t_flags & TF_TOE); 813 MPASS(tp->tod != NULL); 814 MPASS(tp->t_toe != NULL); 815 toep = tp->t_toe; 816 MPASS(toep->vi->adapter == icc->sc); 817 icc->toep = toep; 818 icc->cwt = cxgbei_select_worker_thread(icc); 819 820 icc->ulp_submode = 0; 821 if (ic->ic_header_crc32c) 822 icc->ulp_submode |= ULP_CRC_HEADER; 823 if (ic->ic_data_crc32c) 824 icc->ulp_submode |= ULP_CRC_DATA; 825 so->so_options |= SO_NO_DDP; 826 toep->params.ulp_mode = ULP_MODE_ISCSI; 827 toep->ulpcb = icc; 828 829 send_iscsi_flowc_wr(icc->sc, toep, ci->max_tx_pdu_len); 830 set_ulp_mode_iscsi(icc->sc, toep, icc->ulp_submode); 831 error = 0; 832 } 833 INP_WUNLOCK(inp); 834 835 if (error == 0) { 836 error = icl_cxgbei_setsockopt(ic, so, ci->max_tx_pdu_len, 837 ci->max_rx_pdu_len); 838 } 839 840 return (error); 841 } 842 843 void 844 icl_cxgbei_conn_close(struct icl_conn *ic) 845 { 846 struct icl_cxgbei_conn *icc = ic_to_icc(ic); 847 struct icl_pdu *ip; 848 struct socket *so; 849 struct sockbuf *sb; 850 struct inpcb *inp; 851 struct toepcb *toep = icc->toep; 852 853 MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE); 854 ICL_CONN_LOCK_ASSERT_NOT(ic); 855 856 ICL_CONN_LOCK(ic); 857 so = ic->ic_socket; 858 if (ic->ic_disconnecting || so == NULL) { 859 CTR4(KTR_CXGBE, "%s: icc %p (disconnecting = %d), so %p", 860 __func__, icc, ic->ic_disconnecting, so); 861 ICL_CONN_UNLOCK(ic); 862 return; 863 } 864 ic->ic_disconnecting = true; 865 866 /* These are unused in this driver right now. */ 867 MPASS(STAILQ_EMPTY(&ic->ic_to_send)); 868 MPASS(ic->ic_receive_pdu == NULL); 869 870 #ifdef DIAGNOSTIC 871 KASSERT(ic->ic_outstanding_pdus == 0, 872 ("destroying session with %d outstanding PDUs", 873 ic->ic_outstanding_pdus)); 874 #endif 875 ICL_CONN_UNLOCK(ic); 876 877 CTR3(KTR_CXGBE, "%s: tid %d, icc %p", __func__, toep ? toep->tid : -1, 878 icc); 879 inp = sotoinpcb(so); 880 sb = &so->so_rcv; 881 INP_WLOCK(inp); 882 if (toep != NULL) { /* NULL if connection was never offloaded. */ 883 toep->ulpcb = NULL; 884 885 /* Discard PDUs queued for TX. */ 886 mbufq_drain(&toep->ulp_pduq); 887 888 /* 889 * Wait for the cwt threads to stop processing this 890 * connection. 891 */ 892 SOCKBUF_LOCK(sb); 893 if (icc->rx_flags & RXF_ACTIVE) { 894 volatile u_int *p = &icc->rx_flags; 895 896 SOCKBUF_UNLOCK(sb); 897 INP_WUNLOCK(inp); 898 899 while (*p & RXF_ACTIVE) 900 pause("conclo", 1); 901 902 INP_WLOCK(inp); 903 SOCKBUF_LOCK(sb); 904 } 905 906 /* 907 * Discard received PDUs not passed to the iSCSI 908 * layer. 909 */ 910 while (!STAILQ_EMPTY(&icc->rcvd_pdus)) { 911 ip = STAILQ_FIRST(&icc->rcvd_pdus); 912 STAILQ_REMOVE_HEAD(&icc->rcvd_pdus, ip_next); 913 icl_cxgbei_pdu_done(ip, ENOTCONN); 914 } 915 SOCKBUF_UNLOCK(sb); 916 } 917 INP_WUNLOCK(inp); 918 919 ICL_CONN_LOCK(ic); 920 ic->ic_socket = NULL; 921 ICL_CONN_UNLOCK(ic); 922 923 /* 924 * XXXNP: we should send RST instead of FIN when PDUs held in various 925 * queues were purged instead of delivered reliably but soabort isn't 926 * really general purpose and wouldn't do the right thing here. 927 */ 928 soref(so); 929 soclose(so); 930 931 /* 932 * Wait for the socket to fully close. This ensures any 933 * pending received data has been received (and in particular, 934 * any data that would be received by DDP has been handled). 935 * Callers assume that it is safe to free buffers for tasks 936 * and transfers after this function returns. 937 */ 938 SOCK_LOCK(so); 939 while ((so->so_state & SS_ISDISCONNECTED) == 0) 940 mtx_sleep(&so->so_timeo, SOCK_MTX(so), PSOCK, "conclo2", 0); 941 CURVNET_SET(so->so_vnet); 942 sorele(so); 943 CURVNET_RESTORE(); 944 } 945 946 static void 947 cxgbei_insert_cmp(struct icl_cxgbei_conn *icc, struct cxgbei_cmp *cmp, 948 uint32_t tt) 949 { 950 #ifdef INVARIANTS 951 struct cxgbei_cmp *cmp2; 952 #endif 953 954 cmp->tt = tt; 955 956 mtx_lock(&icc->cmp_lock); 957 #ifdef INVARIANTS 958 LIST_FOREACH(cmp2, &icc->cmp_table[TT_HASH(icc, tt)], link) { 959 KASSERT(cmp2->tt != tt, ("%s: duplicate cmp", __func__)); 960 } 961 #endif 962 LIST_INSERT_HEAD(&icc->cmp_table[TT_HASH(icc, tt)], cmp, link); 963 mtx_unlock(&icc->cmp_lock); 964 } 965 966 struct cxgbei_cmp * 967 cxgbei_find_cmp(struct icl_cxgbei_conn *icc, uint32_t tt) 968 { 969 struct cxgbei_cmp *cmp; 970 971 mtx_lock(&icc->cmp_lock); 972 LIST_FOREACH(cmp, &icc->cmp_table[TT_HASH(icc, tt)], link) { 973 if (cmp->tt == tt) 974 break; 975 } 976 mtx_unlock(&icc->cmp_lock); 977 return (cmp); 978 } 979 980 static void 981 cxgbei_rm_cmp(struct icl_cxgbei_conn *icc, struct cxgbei_cmp *cmp) 982 { 983 #ifdef INVARIANTS 984 struct cxgbei_cmp *cmp2; 985 #endif 986 987 mtx_lock(&icc->cmp_lock); 988 989 #ifdef INVARIANTS 990 LIST_FOREACH(cmp2, &icc->cmp_table[TT_HASH(icc, cmp->tt)], link) { 991 if (cmp2 == cmp) 992 goto found; 993 } 994 panic("%s: could not find cmp", __func__); 995 found: 996 #endif 997 LIST_REMOVE(cmp, link); 998 mtx_unlock(&icc->cmp_lock); 999 } 1000 1001 int 1002 icl_cxgbei_conn_task_setup(struct icl_conn *ic, struct icl_pdu *ip, 1003 struct ccb_scsiio *csio, uint32_t *ittp, void **arg) 1004 { 1005 struct icl_cxgbei_conn *icc = ic_to_icc(ic); 1006 struct toepcb *toep = icc->toep; 1007 struct adapter *sc = icc->sc; 1008 struct cxgbei_data *ci = sc->iscsi_ulp_softc; 1009 struct ppod_region *pr = &ci->pr; 1010 struct cxgbei_ddp_state *ddp; 1011 struct ppod_reservation *prsv; 1012 struct inpcb *inp; 1013 struct mbufq mq; 1014 uint32_t itt; 1015 int rc = 0; 1016 1017 ICL_CONN_LOCK_ASSERT(ic); 1018 1019 /* This is for the offload driver's state. Must not be set already. */ 1020 MPASS(arg != NULL); 1021 MPASS(*arg == NULL); 1022 1023 if (ic->ic_disconnecting || ic->ic_socket == NULL) 1024 return (ECONNRESET); 1025 1026 if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_IN || 1027 csio->dxfer_len < ci->ddp_threshold) { 1028 no_ddp: 1029 /* 1030 * No DDP for this I/O. Allocate an ITT (based on the one 1031 * passed in) that cannot be a valid hardware DDP tag in the 1032 * iSCSI region. 1033 */ 1034 itt = *ittp & M_PPOD_TAG; 1035 itt = V_PPOD_TAG(itt) | pr->pr_invalid_bit; 1036 *ittp = htobe32(itt); 1037 MPASS(*arg == NULL); /* State is maintained for DDP only. */ 1038 if (rc != 0) 1039 counter_u64_add( 1040 toep->ofld_rxq->rx_iscsi_ddp_setup_error, 1); 1041 return (0); 1042 } 1043 1044 /* 1045 * Reserve resources for DDP, update the itt that should be used in the 1046 * PDU, and save DDP specific state for this I/O in *arg. 1047 */ 1048 ddp = malloc(sizeof(*ddp), M_CXGBEI, M_NOWAIT | M_ZERO); 1049 if (ddp == NULL) { 1050 rc = ENOMEM; 1051 goto no_ddp; 1052 } 1053 prsv = &ddp->prsv; 1054 1055 /* XXX add support for all CAM_DATA_ types */ 1056 MPASS((csio->ccb_h.flags & CAM_DATA_MASK) == CAM_DATA_VADDR); 1057 rc = t4_alloc_page_pods_for_buf(pr, (vm_offset_t)csio->data_ptr, 1058 csio->dxfer_len, prsv); 1059 if (rc != 0) { 1060 free(ddp, M_CXGBEI); 1061 goto no_ddp; 1062 } 1063 1064 mbufq_init(&mq, INT_MAX); 1065 rc = t4_write_page_pods_for_buf(sc, toep, prsv, 1066 (vm_offset_t)csio->data_ptr, csio->dxfer_len, &mq); 1067 if (__predict_false(rc != 0)) { 1068 mbufq_drain(&mq); 1069 t4_free_page_pods(prsv); 1070 free(ddp, M_CXGBEI); 1071 goto no_ddp; 1072 } 1073 1074 /* 1075 * Do not get inp from toep->inp as the toepcb might have 1076 * detached already. 1077 */ 1078 inp = sotoinpcb(ic->ic_socket); 1079 INP_WLOCK(inp); 1080 if ((inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) != 0) { 1081 INP_WUNLOCK(inp); 1082 mbufq_drain(&mq); 1083 t4_free_page_pods(prsv); 1084 free(ddp, M_CXGBEI); 1085 return (ECONNRESET); 1086 } 1087 mbufq_concat(&toep->ulp_pduq, &mq); 1088 INP_WUNLOCK(inp); 1089 1090 ddp->cmp.last_datasn = -1; 1091 cxgbei_insert_cmp(icc, &ddp->cmp, prsv->prsv_tag); 1092 *ittp = htobe32(prsv->prsv_tag); 1093 *arg = prsv; 1094 counter_u64_add(toep->ofld_rxq->rx_iscsi_ddp_setup_ok, 1); 1095 return (0); 1096 } 1097 1098 void 1099 icl_cxgbei_conn_task_done(struct icl_conn *ic, void *arg) 1100 { 1101 1102 if (arg != NULL) { 1103 struct cxgbei_ddp_state *ddp = arg; 1104 1105 cxgbei_rm_cmp(ic_to_icc(ic), &ddp->cmp); 1106 t4_free_page_pods(&ddp->prsv); 1107 free(ddp, M_CXGBEI); 1108 } 1109 } 1110 1111 static inline bool 1112 ddp_sgl_check(struct ctl_sg_entry *sg, int entries, int xferlen) 1113 { 1114 int total_len = 0; 1115 1116 MPASS(entries > 0); 1117 if (((vm_offset_t)sg[--entries].addr & 3U) != 0) 1118 return (false); 1119 1120 total_len += sg[entries].len; 1121 1122 while (--entries >= 0) { 1123 if (((vm_offset_t)sg[entries].addr & PAGE_MASK) != 0 || 1124 (sg[entries].len % PAGE_SIZE) != 0) 1125 return (false); 1126 total_len += sg[entries].len; 1127 } 1128 1129 MPASS(total_len == xferlen); 1130 return (true); 1131 } 1132 1133 /* XXXNP: PDU should be passed in as parameter, like on the initiator. */ 1134 #define io_to_request_pdu(io) ((io)->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr) 1135 #define io_to_ddp_state(io) ((io)->io_hdr.ctl_private[CTL_PRIV_FRONTEND2].ptr) 1136 1137 int 1138 icl_cxgbei_conn_transfer_setup(struct icl_conn *ic, union ctl_io *io, 1139 uint32_t *tttp, void **arg) 1140 { 1141 struct icl_cxgbei_conn *icc = ic_to_icc(ic); 1142 struct toepcb *toep = icc->toep; 1143 struct ctl_scsiio *ctsio = &io->scsiio; 1144 struct adapter *sc = icc->sc; 1145 struct cxgbei_data *ci = sc->iscsi_ulp_softc; 1146 struct ppod_region *pr = &ci->pr; 1147 struct cxgbei_ddp_state *ddp; 1148 struct ppod_reservation *prsv; 1149 struct ctl_sg_entry *sgl, sg_entry; 1150 struct inpcb *inp; 1151 struct mbufq mq; 1152 int sg_entries = ctsio->kern_sg_entries; 1153 uint32_t ttt; 1154 int xferlen, rc = 0, alias; 1155 1156 /* This is for the offload driver's state. Must not be set already. */ 1157 MPASS(arg != NULL); 1158 MPASS(*arg == NULL); 1159 1160 if (ctsio->ext_data_filled == 0) { 1161 int first_burst; 1162 struct icl_pdu *ip = io_to_request_pdu(io); 1163 #ifdef INVARIANTS 1164 struct icl_cxgbei_pdu *icp = ip_to_icp(ip); 1165 1166 MPASS(icp->icp_signature == CXGBEI_PDU_SIGNATURE); 1167 MPASS(ic == ip->ip_conn); 1168 MPASS(ip->ip_bhs_mbuf != NULL); 1169 #endif 1170 first_burst = icl_pdu_data_segment_length(ip); 1171 1172 /* 1173 * Note that ICL calls conn_transfer_setup even if the first 1174 * burst had everything and there's nothing left to transfer. 1175 * 1176 * NB: The CTL frontend might have provided a buffer 1177 * whose length (kern_data_len) is smaller than the 1178 * FirstBurstLength of unsolicited data. Treat those 1179 * as an empty transfer. 1180 */ 1181 xferlen = ctsio->kern_data_len; 1182 if (xferlen < first_burst || 1183 xferlen - first_burst < ci->ddp_threshold) { 1184 no_ddp: 1185 /* 1186 * No DDP for this transfer. Allocate a TTT (based on 1187 * the one passed in) that cannot be a valid hardware 1188 * DDP tag in the iSCSI region. 1189 */ 1190 ttt = *tttp & M_PPOD_TAG; 1191 ttt = V_PPOD_TAG(ttt) | pr->pr_invalid_bit; 1192 *tttp = htobe32(ttt); 1193 MPASS(io_to_ddp_state(io) == NULL); 1194 if (rc != 0) 1195 counter_u64_add( 1196 toep->ofld_rxq->rx_iscsi_ddp_setup_error, 1); 1197 return (0); 1198 } 1199 1200 if (sg_entries == 0) { 1201 sgl = &sg_entry; 1202 sgl->len = xferlen; 1203 sgl->addr = (void *)ctsio->kern_data_ptr; 1204 sg_entries = 1; 1205 } else 1206 sgl = (void *)ctsio->kern_data_ptr; 1207 1208 if (!ddp_sgl_check(sgl, sg_entries, xferlen)) 1209 goto no_ddp; 1210 1211 /* 1212 * Reserve resources for DDP, update the ttt that should be used 1213 * in the PDU, and save DDP specific state for this I/O. 1214 */ 1215 MPASS(io_to_ddp_state(io) == NULL); 1216 ddp = malloc(sizeof(*ddp), M_CXGBEI, M_NOWAIT | M_ZERO); 1217 if (ddp == NULL) { 1218 rc = ENOMEM; 1219 goto no_ddp; 1220 } 1221 prsv = &ddp->prsv; 1222 1223 rc = t4_alloc_page_pods_for_sgl(pr, sgl, sg_entries, prsv); 1224 if (rc != 0) { 1225 free(ddp, M_CXGBEI); 1226 goto no_ddp; 1227 } 1228 1229 mbufq_init(&mq, INT_MAX); 1230 rc = t4_write_page_pods_for_sgl(sc, toep, prsv, sgl, sg_entries, 1231 xferlen, &mq); 1232 if (__predict_false(rc != 0)) { 1233 mbufq_drain(&mq); 1234 t4_free_page_pods(prsv); 1235 free(ddp, M_CXGBEI); 1236 goto no_ddp; 1237 } 1238 1239 /* 1240 * Do not get inp from toep->inp as the toepcb might 1241 * have detached already. 1242 */ 1243 ICL_CONN_LOCK(ic); 1244 if (ic->ic_disconnecting || ic->ic_socket == NULL) { 1245 ICL_CONN_UNLOCK(ic); 1246 mbufq_drain(&mq); 1247 t4_free_page_pods(prsv); 1248 free(ddp, M_CXGBEI); 1249 return (ECONNRESET); 1250 } 1251 inp = sotoinpcb(ic->ic_socket); 1252 INP_WLOCK(inp); 1253 ICL_CONN_UNLOCK(ic); 1254 if ((inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) != 0) { 1255 INP_WUNLOCK(inp); 1256 mbufq_drain(&mq); 1257 t4_free_page_pods(prsv); 1258 free(ddp, M_CXGBEI); 1259 return (ECONNRESET); 1260 } 1261 mbufq_concat(&toep->ulp_pduq, &mq); 1262 INP_WUNLOCK(inp); 1263 1264 ddp->cmp.next_buffer_offset = ctsio->kern_rel_offset + 1265 first_burst; 1266 ddp->cmp.last_datasn = -1; 1267 cxgbei_insert_cmp(icc, &ddp->cmp, prsv->prsv_tag); 1268 *tttp = htobe32(prsv->prsv_tag); 1269 io_to_ddp_state(io) = ddp; 1270 *arg = ctsio; 1271 counter_u64_add(toep->ofld_rxq->rx_iscsi_ddp_setup_ok, 1); 1272 return (0); 1273 } 1274 1275 /* 1276 * In the middle of an I/O. A non-NULL page pod reservation indicates 1277 * that a DDP buffer is being used for the I/O. 1278 */ 1279 ddp = io_to_ddp_state(ctsio); 1280 if (ddp == NULL) 1281 goto no_ddp; 1282 prsv = &ddp->prsv; 1283 1284 alias = (prsv->prsv_tag & pr->pr_alias_mask) >> pr->pr_alias_shift; 1285 alias++; 1286 prsv->prsv_tag &= ~pr->pr_alias_mask; 1287 prsv->prsv_tag |= alias << pr->pr_alias_shift & pr->pr_alias_mask; 1288 1289 ddp->cmp.next_datasn = 0; 1290 ddp->cmp.last_datasn = -1; 1291 cxgbei_insert_cmp(icc, &ddp->cmp, prsv->prsv_tag); 1292 *tttp = htobe32(prsv->prsv_tag); 1293 *arg = ctsio; 1294 1295 return (0); 1296 } 1297 1298 void 1299 icl_cxgbei_conn_transfer_done(struct icl_conn *ic, void *arg) 1300 { 1301 struct ctl_scsiio *ctsio = arg; 1302 1303 if (ctsio != NULL) { 1304 struct cxgbei_ddp_state *ddp; 1305 1306 ddp = io_to_ddp_state(ctsio); 1307 MPASS(ddp != NULL); 1308 1309 cxgbei_rm_cmp(ic_to_icc(ic), &ddp->cmp); 1310 if (ctsio->kern_data_len == ctsio->ext_data_filled || 1311 ic->ic_disconnecting) { 1312 t4_free_page_pods(&ddp->prsv); 1313 free(ddp, M_CXGBEI); 1314 io_to_ddp_state(ctsio) = NULL; 1315 } 1316 } 1317 } 1318 1319 static void 1320 cxgbei_limits(struct adapter *sc, void *arg) 1321 { 1322 struct icl_drv_limits *idl = arg; 1323 struct cxgbei_data *ci; 1324 int max_dsl; 1325 1326 if (begin_synchronized_op(sc, NULL, HOLD_LOCK, "t4lims") != 0) 1327 return; 1328 1329 if (uld_active(sc, ULD_ISCSI)) { 1330 ci = sc->iscsi_ulp_softc; 1331 MPASS(ci != NULL); 1332 1333 /* 1334 * AHS is not supported by the kernel so we'll not account for 1335 * it either in our PDU len -> data segment len conversions. 1336 */ 1337 1338 max_dsl = ci->max_rx_pdu_len - ISCSI_BHS_SIZE - 1339 ISCSI_HEADER_DIGEST_SIZE - ISCSI_DATA_DIGEST_SIZE; 1340 if (idl->idl_max_recv_data_segment_length > max_dsl) 1341 idl->idl_max_recv_data_segment_length = max_dsl; 1342 1343 max_dsl = ci->max_tx_pdu_len - ISCSI_BHS_SIZE - 1344 ISCSI_HEADER_DIGEST_SIZE - ISCSI_DATA_DIGEST_SIZE; 1345 if (idl->idl_max_send_data_segment_length > max_dsl) 1346 idl->idl_max_send_data_segment_length = max_dsl; 1347 } 1348 1349 end_synchronized_op(sc, LOCK_HELD); 1350 } 1351 1352 static int 1353 icl_cxgbei_limits(struct icl_drv_limits *idl) 1354 { 1355 1356 /* Maximum allowed by the RFC. cxgbei_limits will clip them. */ 1357 idl->idl_max_recv_data_segment_length = (1 << 24) - 1; 1358 idl->idl_max_send_data_segment_length = (1 << 24) - 1; 1359 1360 /* These are somewhat arbitrary. */ 1361 idl->idl_max_burst_length = max_burst_length; 1362 idl->idl_first_burst_length = first_burst_length; 1363 1364 t4_iterate(cxgbei_limits, idl); 1365 1366 return (0); 1367 } 1368 1369 int 1370 icl_cxgbei_mod_load(void) 1371 { 1372 int rc; 1373 1374 refcount_init(&icl_cxgbei_ncons, 0); 1375 1376 rc = icl_register("cxgbei", false, -100, icl_cxgbei_limits, 1377 icl_cxgbei_new_conn); 1378 1379 return (rc); 1380 } 1381 1382 int 1383 icl_cxgbei_mod_unload(void) 1384 { 1385 1386 if (icl_cxgbei_ncons != 0) 1387 return (EBUSY); 1388 1389 icl_unregister("cxgbei", false); 1390 1391 return (0); 1392 } 1393 #endif 1394