2 * Copyright (c) 2012 The FreeBSD Foundation
3 * Copyright (c) 2015 Chelsio Communications, Inc.
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
33 * cxgbei implementation of iSCSI Common Layer kobj(9) interface.
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
40 #include "opt_inet6.h"
43 #include <sys/param.h>
44 #include <sys/capsicum.h>
45 #include <sys/condvar.h>
48 #include <sys/kernel.h>
49 #include <sys/kthread.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>
62 #include <machine/bus.h>
66 #include <netinet/in.h>
67 #include <netinet/in_pcb.h>
68 #include <netinet/tcp.h>
69 #include <netinet/tcp_var.h>
70 #include <netinet/toecore.h>
72 #include <dev/iscsi/icl.h>
73 #include <dev/iscsi/iscsi_proto.h>
74 #include <icl_conn_if.h>
76 #include <cam/scsi/scsi_all.h>
77 #include <cam/scsi/scsi_da.h>
78 #include <cam/ctl/ctl_io.h>
79 #include <cam/ctl/ctl.h>
80 #include <cam/ctl/ctl_backend.h>
81 #include <cam/ctl/ctl_error.h>
82 #include <cam/ctl/ctl_frontend.h>
83 #include <cam/ctl/ctl_debug.h>
84 #include <cam/ctl/ctl_ha.h>
85 #include <cam/ctl/ctl_ioctl.h>
88 #include <cam/cam_ccb.h>
89 #include <cam/cam_xpt.h>
90 #include <cam/cam_debug.h>
91 #include <cam/cam_sim.h>
92 #include <cam/cam_xpt_sim.h>
93 #include <cam/cam_xpt_periph.h>
94 #include <cam/cam_periph.h>
95 #include <cam/cam_compat.h>
96 #include <cam/scsi/scsi_message.h>
98 #include "common/common.h"
99 #include "common/t4_tcb.h"
100 #include "tom/t4_tom.h"
103 SYSCTL_NODE(_kern_icl, OID_AUTO, cxgbei, CTLFLAG_RD, 0, "Chelsio iSCSI offload");
104 static int coalesce = 1;
105 SYSCTL_INT(_kern_icl_cxgbei, OID_AUTO, coalesce, CTLFLAG_RWTUN,
106 &coalesce, 0, "Try to coalesce PDUs before sending");
107 static int partial_receive_len = 128 * 1024;
108 SYSCTL_INT(_kern_icl_cxgbei, OID_AUTO, partial_receive_len, CTLFLAG_RWTUN,
109 &partial_receive_len, 0, "Minimum read size for partially received "
111 static int sendspace = 1048576;
112 SYSCTL_INT(_kern_icl_cxgbei, OID_AUTO, sendspace, CTLFLAG_RWTUN,
113 &sendspace, 0, "Default send socket buffer size");
114 static int recvspace = 1048576;
115 SYSCTL_INT(_kern_icl_cxgbei, OID_AUTO, recvspace, CTLFLAG_RWTUN,
116 &recvspace, 0, "Default receive socket buffer size");
118 static uma_zone_t prsv_zone;
119 static volatile u_int icl_cxgbei_ncons;
121 #define ICL_CONN_LOCK(X) mtx_lock(X->ic_lock)
122 #define ICL_CONN_UNLOCK(X) mtx_unlock(X->ic_lock)
123 #define ICL_CONN_LOCK_ASSERT(X) mtx_assert(X->ic_lock, MA_OWNED)
124 #define ICL_CONN_LOCK_ASSERT_NOT(X) mtx_assert(X->ic_lock, MA_NOTOWNED)
126 struct icl_pdu *icl_cxgbei_new_pdu(int);
127 void icl_cxgbei_new_pdu_set_conn(struct icl_pdu *, struct icl_conn *);
129 static icl_conn_new_pdu_t icl_cxgbei_conn_new_pdu;
130 icl_conn_pdu_free_t icl_cxgbei_conn_pdu_free;
131 static icl_conn_pdu_data_segment_length_t
132 icl_cxgbei_conn_pdu_data_segment_length;
133 static icl_conn_pdu_append_data_t icl_cxgbei_conn_pdu_append_data;
134 static icl_conn_pdu_get_data_t icl_cxgbei_conn_pdu_get_data;
135 static icl_conn_pdu_queue_t icl_cxgbei_conn_pdu_queue;
136 static icl_conn_handoff_t icl_cxgbei_conn_handoff;
137 static icl_conn_free_t icl_cxgbei_conn_free;
138 static icl_conn_close_t icl_cxgbei_conn_close;
139 static icl_conn_task_setup_t icl_cxgbei_conn_task_setup;
140 static icl_conn_task_done_t icl_cxgbei_conn_task_done;
141 static icl_conn_transfer_setup_t icl_cxgbei_conn_transfer_setup;
142 static icl_conn_transfer_done_t icl_cxgbei_conn_transfer_done;
144 static kobj_method_t icl_cxgbei_methods[] = {
145 KOBJMETHOD(icl_conn_new_pdu, icl_cxgbei_conn_new_pdu),
146 KOBJMETHOD(icl_conn_pdu_free, icl_cxgbei_conn_pdu_free),
147 KOBJMETHOD(icl_conn_pdu_data_segment_length,
148 icl_cxgbei_conn_pdu_data_segment_length),
149 KOBJMETHOD(icl_conn_pdu_append_data, icl_cxgbei_conn_pdu_append_data),
150 KOBJMETHOD(icl_conn_pdu_get_data, icl_cxgbei_conn_pdu_get_data),
151 KOBJMETHOD(icl_conn_pdu_queue, icl_cxgbei_conn_pdu_queue),
152 KOBJMETHOD(icl_conn_handoff, icl_cxgbei_conn_handoff),
153 KOBJMETHOD(icl_conn_free, icl_cxgbei_conn_free),
154 KOBJMETHOD(icl_conn_close, icl_cxgbei_conn_close),
155 KOBJMETHOD(icl_conn_task_setup, icl_cxgbei_conn_task_setup),
156 KOBJMETHOD(icl_conn_task_done, icl_cxgbei_conn_task_done),
157 KOBJMETHOD(icl_conn_transfer_setup, icl_cxgbei_conn_transfer_setup),
158 KOBJMETHOD(icl_conn_transfer_done, icl_cxgbei_conn_transfer_done),
162 DEFINE_CLASS(icl_cxgbei, icl_cxgbei_methods, sizeof(struct icl_cxgbei_conn));
165 icl_cxgbei_conn_pdu_free(struct icl_conn *ic, struct icl_pdu *ip)
168 struct icl_cxgbei_pdu *icp = ip_to_icp(ip);
171 MPASS(icp->icp_signature == CXGBEI_PDU_SIGNATURE);
172 MPASS(ic == ip->ip_conn);
173 MPASS(ip->ip_bhs_mbuf != NULL);
175 m_freem(ip->ip_ahs_mbuf);
176 m_freem(ip->ip_data_mbuf);
177 m_freem(ip->ip_bhs_mbuf); /* storage for icl_cxgbei_pdu itself */
180 if (__predict_true(ic != NULL))
181 refcount_release(&ic->ic_outstanding_pdus);
186 icl_cxgbei_new_pdu(int flags)
188 struct icl_cxgbei_pdu *icp;
193 m = m_gethdr(flags, MT_DATA);
194 if (__predict_false(m == NULL))
197 a = roundup2(mtod(m, uintptr_t), _Alignof(struct icl_cxgbei_pdu));
198 icp = (struct icl_cxgbei_pdu *)a;
199 bzero(icp, sizeof(*icp));
201 icp->icp_signature = CXGBEI_PDU_SIGNATURE;
205 a = roundup2((uintptr_t)(icp + 1), _Alignof(struct iscsi_bhs *));
206 ip->ip_bhs = (struct iscsi_bhs *)a;
208 /* Everything must fit entirely in the mbuf. */
209 a = (uintptr_t)(ip->ip_bhs + 1);
210 MPASS(a <= (uintptr_t)m + MSIZE);
212 bzero(ip->ip_bhs, sizeof(*ip->ip_bhs));
214 m->m_data = (void *)ip->ip_bhs;
215 m->m_len = sizeof(struct iscsi_bhs);
216 m->m_pkthdr.len = m->m_len;
222 icl_cxgbei_new_pdu_set_conn(struct icl_pdu *ip, struct icl_conn *ic)
227 refcount_acquire(&ic->ic_outstanding_pdus);
232 * Allocate icl_pdu with empty BHS to fill up by the caller.
234 static struct icl_pdu *
235 icl_cxgbei_conn_new_pdu(struct icl_conn *ic, int flags)
239 ip = icl_cxgbei_new_pdu(flags);
240 if (__predict_false(ip == NULL))
242 icl_cxgbei_new_pdu_set_conn(ip, ic);
248 icl_pdu_data_segment_length(const struct icl_pdu *request)
252 len += request->ip_bhs->bhs_data_segment_len[0];
254 len += request->ip_bhs->bhs_data_segment_len[1];
256 len += request->ip_bhs->bhs_data_segment_len[2];
262 icl_cxgbei_conn_pdu_data_segment_length(struct icl_conn *ic,
263 const struct icl_pdu *request)
266 return (icl_pdu_data_segment_length(request));
270 finalize_pdu(struct icl_cxgbei_conn *icc, struct icl_cxgbei_pdu *icp)
272 struct icl_pdu *ip = &icp->ip;
273 uint8_t ulp_submode, padding;
274 struct mbuf *m, *last;
275 struct iscsi_bhs *bhs;
278 * Fix up the data segment mbuf first.
280 m = ip->ip_data_mbuf;
281 ulp_submode = icc->ulp_submode;
286 * Round up the data segment to a 4B boundary. Pad with 0 if
287 * necessary. There will definitely be room in the mbuf.
289 padding = roundup2(ip->ip_data_len, 4) - ip->ip_data_len;
291 bzero(mtod(last, uint8_t *) + last->m_len, padding);
292 last->m_len += padding;
295 MPASS(ip->ip_data_len == 0);
296 ulp_submode &= ~ULP_CRC_DATA;
301 * Now the header mbuf that has the BHS.
304 MPASS(m->m_pkthdr.len == sizeof(struct iscsi_bhs));
305 MPASS(m->m_len == sizeof(struct iscsi_bhs));
308 bhs->bhs_data_segment_len[2] = ip->ip_data_len;
309 bhs->bhs_data_segment_len[1] = ip->ip_data_len >> 8;
310 bhs->bhs_data_segment_len[0] = ip->ip_data_len >> 16;
312 /* "Convert" PDU to mbuf chain. Do not use icp/ip after this. */
313 m->m_pkthdr.len = sizeof(struct iscsi_bhs) + ip->ip_data_len + padding;
314 m->m_next = ip->ip_data_mbuf;
315 set_mbuf_ulp_submode(m, ulp_submode);
317 bzero(icp, sizeof(*icp));
320 refcount_release(&icc->ic.ic_outstanding_pdus);
327 icl_cxgbei_conn_pdu_append_data(struct icl_conn *ic, struct icl_pdu *ip,
328 const void *addr, size_t len, int flags)
332 struct icl_cxgbei_pdu *icp = ip_to_icp(ip);
335 MPASS(icp->icp_signature == CXGBEI_PDU_SIGNATURE);
336 MPASS(ic == ip->ip_conn);
337 KASSERT(len > 0, ("%s: len is %jd", __func__, (intmax_t)len));
339 m = ip->ip_data_mbuf;
341 m = m_getjcl(M_NOWAIT, MT_DATA, 0, MJUM16BYTES);
342 if (__predict_false(m == NULL))
345 ip->ip_data_mbuf = m;
348 if (__predict_true(m_append(m, len, addr) != 0)) {
349 ip->ip_data_len += len;
350 MPASS(ip->ip_data_len <= ic->ic_max_data_segment_length);
353 if (flags & M_WAITOK) {
354 CXGBE_UNIMPLEMENTED("fail safe append");
356 ip->ip_data_len = m_length(m, NULL);
362 icl_cxgbei_conn_pdu_get_data(struct icl_conn *ic, struct icl_pdu *ip,
363 size_t off, void *addr, size_t len)
365 struct icl_cxgbei_pdu *icp = ip_to_icp(ip);
367 if (icp->icp_flags & ICPF_RX_DDP)
368 return; /* data is DDP'ed, no need to copy */
369 m_copydata(ip->ip_data_mbuf, off, len, addr);
373 icl_cxgbei_conn_pdu_queue(struct icl_conn *ic, struct icl_pdu *ip)
375 struct icl_cxgbei_conn *icc = ic_to_icc(ic);
376 struct icl_cxgbei_pdu *icp = ip_to_icp(ip);
377 struct socket *so = ic->ic_socket;
378 struct toepcb *toep = icc->toep;
382 MPASS(ic == ip->ip_conn);
383 MPASS(ip->ip_bhs_mbuf != NULL);
384 /* The kernel doesn't generate PDUs with AHS. */
385 MPASS(ip->ip_ahs_mbuf == NULL && ip->ip_ahs_len == 0);
387 ICL_CONN_LOCK_ASSERT(ic);
388 /* NOTE: sowriteable without so_snd lock is a mostly harmless race. */
389 if (ic->ic_disconnecting || so == NULL || !sowriteable(so)) {
390 icl_cxgbei_conn_pdu_free(ic, ip);
394 m = finalize_pdu(icc, icp);
396 MPASS((m->m_pkthdr.len & 3) == 0);
399 * Do not get inp from toep->inp as the toepcb might have detached
404 if (__predict_false(inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) ||
405 __predict_false((toep->flags & TPF_ATTACHED) == 0))
408 mbufq_enqueue(&toep->ulp_pduq, m);
409 t4_push_pdus(icc->sc, toep, 0);
414 static struct icl_conn *
415 icl_cxgbei_new_conn(const char *name, struct mtx *lock)
417 struct icl_cxgbei_conn *icc;
420 refcount_acquire(&icl_cxgbei_ncons);
422 icc = (struct icl_cxgbei_conn *)kobj_create(&icl_cxgbei_class, M_CXGBE,
424 icc->icc_signature = CXGBEI_CONN_SIGNATURE;
425 STAILQ_INIT(&icc->rcvd_pdus);
430 /* XXXNP: review. Most of these icl_conn fields aren't really used */
431 STAILQ_INIT(&ic->ic_to_send);
432 cv_init(&ic->ic_send_cv, "icl_cxgbei_tx");
433 cv_init(&ic->ic_receive_cv, "icl_cxgbei_rx");
435 refcount_init(&ic->ic_outstanding_pdus, 0);
437 /* This is a stop-gap value that will be corrected during handoff. */
438 ic->ic_max_data_segment_length = 16384;
440 ic->ic_offload = "cxgbei";
441 ic->ic_unmapped = false;
443 CTR2(KTR_CXGBE, "%s: icc %p", __func__, icc);
449 icl_cxgbei_conn_free(struct icl_conn *ic)
451 struct icl_cxgbei_conn *icc = ic_to_icc(ic);
453 MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE);
455 CTR2(KTR_CXGBE, "%s: icc %p", __func__, icc);
457 cv_destroy(&ic->ic_send_cv);
458 cv_destroy(&ic->ic_receive_cv);
460 kobj_delete((struct kobj *)icc, M_CXGBE);
461 refcount_release(&icl_cxgbei_ncons);
465 icl_cxgbei_setsockopt(struct icl_conn *ic, struct socket *so, int sspace,
469 int error, one = 1, ss, rs;
471 ss = max(sendspace, sspace);
472 rs = max(recvspace, rspace);
474 error = soreserve(so, ss, rs);
476 icl_cxgbei_conn_close(ic);
479 SOCKBUF_LOCK(&so->so_snd);
480 so->so_snd.sb_flags |= SB_AUTOSIZE;
481 SOCKBUF_UNLOCK(&so->so_snd);
482 SOCKBUF_LOCK(&so->so_rcv);
483 so->so_rcv.sb_flags |= SB_AUTOSIZE;
484 SOCKBUF_UNLOCK(&so->so_rcv);
489 bzero(&opt, sizeof(opt));
490 opt.sopt_dir = SOPT_SET;
491 opt.sopt_level = IPPROTO_TCP;
492 opt.sopt_name = TCP_NODELAY;
494 opt.sopt_valsize = sizeof(one);
495 error = sosetopt(so, &opt);
497 icl_cxgbei_conn_close(ic);
505 * Request/response structure used to find out the adapter offloading a socket.
507 struct find_ofld_adapter_rr {
509 struct adapter *sc; /* result */
513 find_offload_adapter(struct adapter *sc, void *arg)
515 struct find_ofld_adapter_rr *fa = arg;
516 struct socket *so = fa->so;
517 struct tom_data *td = sc->tom_softc;
521 /* Non-TCP were filtered out earlier. */
522 MPASS(so->so_proto->pr_protocol == IPPROTO_TCP);
525 return; /* Found already. */
528 return; /* TOE not enabled on this adapter. */
532 if ((inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) == 0) {
534 if (tp->t_flags & TF_TOE && tp->tod == &td->tod)
535 fa->sc = sc; /* Found. */
540 /* XXXNP: move this to t4_tom. */
542 send_iscsi_flowc_wr(struct adapter *sc, struct toepcb *toep, int maxlen)
545 struct fw_flowc_wr *flowc;
546 const u_int nparams = 1;
548 struct ofld_tx_sdesc *txsd = &toep->txsd[toep->txsd_pidx];
550 flowclen = sizeof(*flowc) + nparams * sizeof(struct fw_flowc_mnemval);
552 wr = alloc_wrqe(roundup2(flowclen, 16), toep->ofld_txq);
555 panic("%s: allocation failure.", __func__);
558 memset(flowc, 0, wr->wr_len);
560 flowc->op_to_nparams = htobe32(V_FW_WR_OP(FW_FLOWC_WR) |
561 V_FW_FLOWC_WR_NPARAMS(nparams));
562 flowc->flowid_len16 = htonl(V_FW_WR_LEN16(howmany(flowclen, 16)) |
563 V_FW_WR_FLOWID(toep->tid));
565 flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX;
566 flowc->mnemval[0].val = htobe32(maxlen);
568 txsd->tx_credits = howmany(flowclen, 16);
570 KASSERT(toep->tx_credits >= txsd->tx_credits && toep->txsd_avail > 0,
571 ("%s: not enough credits (%d)", __func__, toep->tx_credits));
572 toep->tx_credits -= txsd->tx_credits;
573 if (__predict_false(++toep->txsd_pidx == toep->txsd_total))
581 set_ulp_mode_iscsi(struct adapter *sc, struct toepcb *toep, int hcrc, int dcrc)
583 uint64_t val = ULP_MODE_ISCSI;
586 val |= ULP_CRC_HEADER << 4;
588 val |= ULP_CRC_DATA << 4;
590 CTR4(KTR_CXGBE, "%s: tid %u, ULP_MODE_ISCSI, CRC hdr=%d data=%d",
591 __func__, toep->tid, hcrc, dcrc);
593 t4_set_tcb_field(sc, toep->ctrlq, toep, W_TCB_ULP_TYPE,
594 V_TCB_ULP_TYPE(M_TCB_ULP_TYPE) | V_TCB_ULP_RAW(M_TCB_ULP_RAW), val,
599 * XXXNP: Who is responsible for cleaning up the socket if this returns with an
600 * error? Review all error paths.
602 * XXXNP: What happens to the socket's fd reference if the operation is
603 * successful, and how does that affect the socket's life cycle?
606 icl_cxgbei_conn_handoff(struct icl_conn *ic, int fd)
608 struct icl_cxgbei_conn *icc = ic_to_icc(ic);
609 struct cxgbei_data *ci;
610 struct find_ofld_adapter_rr fa;
619 MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE);
620 ICL_CONN_LOCK_ASSERT_NOT(ic);
623 * Steal the socket from userland.
625 error = fget(curthread, fd,
626 cap_rights_init(&rights, CAP_SOCK_CLIENT), &fp);
629 if (fp->f_type != DTYPE_SOCKET) {
630 fdrop(fp, curthread);
634 if (so->so_type != SOCK_STREAM ||
635 so->so_proto->pr_protocol != IPPROTO_TCP) {
636 fdrop(fp, curthread);
641 if (ic->ic_socket != NULL) {
643 fdrop(fp, curthread);
646 ic->ic_disconnecting = false;
648 fp->f_ops = &badfileops;
650 fdrop(fp, curthread);
653 /* Find the adapter offloading this socket. */
656 t4_iterate(find_offload_adapter, &fa);
660 ci = icc->sc->iscsi_ulp_softc;
665 if (inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT))
669 * socket could not have been "unoffloaded" if here.
671 MPASS(tp->t_flags & TF_TOE);
672 MPASS(tp->tod != NULL);
673 MPASS(tp->t_toe != NULL);
675 MPASS(toep->vi->pi->adapter == icc->sc);
677 icc->cwt = cxgbei_select_worker_thread(icc);
680 * We maintain the _send_ DSL in this field just to have a
681 * convenient way to assert that the kernel never sends
682 * oversized PDUs. This field is otherwise unused in the driver
685 ic->ic_max_data_segment_length = ci->max_tx_pdu_len -
688 icc->ulp_submode = 0;
689 if (ic->ic_header_crc32c) {
690 icc->ulp_submode |= ULP_CRC_HEADER;
691 ic->ic_max_data_segment_length -=
692 ISCSI_HEADER_DIGEST_SIZE;
694 if (ic->ic_data_crc32c) {
695 icc->ulp_submode |= ULP_CRC_DATA;
696 ic->ic_max_data_segment_length -=
697 ISCSI_DATA_DIGEST_SIZE;
699 so->so_options |= SO_NO_DDP;
700 toep->ulp_mode = ULP_MODE_ISCSI;
703 send_iscsi_flowc_wr(icc->sc, toep, ci->max_tx_pdu_len);
704 set_ulp_mode_iscsi(icc->sc, toep, ic->ic_header_crc32c,
711 error = icl_cxgbei_setsockopt(ic, so, ci->max_tx_pdu_len,
719 icl_cxgbei_conn_close(struct icl_conn *ic)
721 struct icl_cxgbei_conn *icc = ic_to_icc(ic);
726 struct toepcb *toep = icc->toep;
728 MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE);
729 ICL_CONN_LOCK_ASSERT_NOT(ic);
733 if (ic->ic_disconnecting || so == NULL) {
734 CTR4(KTR_CXGBE, "%s: icc %p (disconnecting = %d), so %p",
735 __func__, icc, ic->ic_disconnecting, so);
739 ic->ic_disconnecting = true;
741 /* These are unused in this driver right now. */
742 MPASS(STAILQ_EMPTY(&ic->ic_to_send));
743 MPASS(ic->ic_receive_pdu == NULL);
746 KASSERT(ic->ic_outstanding_pdus == 0,
747 ("destroying session with %d outstanding PDUs",
748 ic->ic_outstanding_pdus));
752 CTR3(KTR_CXGBE, "%s: tid %d, icc %p", __func__, toep ? toep->tid : -1,
757 if (toep != NULL) { /* NULL if connection was never offloaded. */
759 mbufq_drain(&toep->ulp_pduq);
761 if (icc->rx_flags & RXF_ACTIVE) {
762 volatile u_int *p = &icc->rx_flags;
767 while (*p & RXF_ACTIVE)
774 while (!STAILQ_EMPTY(&icc->rcvd_pdus)) {
775 ip = STAILQ_FIRST(&icc->rcvd_pdus);
776 STAILQ_REMOVE_HEAD(&icc->rcvd_pdus, ip_next);
777 icl_cxgbei_conn_pdu_free(ic, ip);
784 ic->ic_socket = NULL;
788 * XXXNP: we should send RST instead of FIN when PDUs held in various
789 * queues were purged instead of delivered reliably but soabort isn't
790 * really general purpose and wouldn't do the right thing here.
796 icl_cxgbei_conn_task_setup(struct icl_conn *ic, struct icl_pdu *ip,
797 struct ccb_scsiio *csio, uint32_t *ittp, void **arg)
799 struct icl_cxgbei_conn *icc = ic_to_icc(ic);
800 struct toepcb *toep = icc->toep;
801 struct adapter *sc = icc->sc;
802 struct cxgbei_data *ci = sc->iscsi_ulp_softc;
803 struct ppod_region *pr = &ci->pr;
804 struct ppod_reservation *prsv;
808 /* This is for the offload driver's state. Must not be set already. */
812 if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_IN ||
813 csio->dxfer_len < ci->ddp_threshold) {
816 * No DDP for this I/O. Allocate an ITT (based on the one
817 * passed in) that cannot be a valid hardware DDP tag in the
820 itt = *ittp & M_PPOD_TAG;
821 itt = V_PPOD_TAG(itt) | pr->pr_invalid_bit;
822 *ittp = htobe32(itt);
823 MPASS(*arg == NULL); /* State is maintained for DDP only. */
825 counter_u64_add(ci->ddp_setup_error, 1);
830 * Reserve resources for DDP, update the itt that should be used in the
831 * PDU, and save DDP specific state for this I/O in *arg.
834 prsv = uma_zalloc(prsv_zone, M_NOWAIT);
840 /* XXX add support for all CAM_DATA_ types */
841 MPASS((csio->ccb_h.flags & CAM_DATA_MASK) == CAM_DATA_VADDR);
842 rc = t4_alloc_page_pods_for_buf(pr, (vm_offset_t)csio->data_ptr,
843 csio->dxfer_len, prsv);
845 uma_zfree(prsv_zone, prsv);
849 rc = t4_write_page_pods_for_buf(sc, toep->ofld_txq, toep->tid, prsv,
850 (vm_offset_t)csio->data_ptr, csio->dxfer_len);
852 t4_free_page_pods(prsv);
853 uma_zfree(prsv_zone, prsv);
857 *ittp = htobe32(prsv->prsv_tag);
859 counter_u64_add(ci->ddp_setup_ok, 1);
864 icl_cxgbei_conn_task_done(struct icl_conn *ic, void *arg)
868 struct ppod_reservation *prsv = arg;
870 t4_free_page_pods(prsv);
871 uma_zfree(prsv_zone, prsv);
875 /* XXXNP: PDU should be passed in as parameter, like on the initiator. */
876 #define io_to_request_pdu(io) ((io)->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr)
877 #define io_to_ppod_reservation(io) ((io)->io_hdr.ctl_private[CTL_PRIV_FRONTEND2].ptr)
880 icl_cxgbei_conn_transfer_setup(struct icl_conn *ic, union ctl_io *io,
881 uint32_t *tttp, void **arg)
883 struct icl_cxgbei_conn *icc = ic_to_icc(ic);
884 struct toepcb *toep = icc->toep;
885 struct ctl_scsiio *ctsio = &io->scsiio;
886 struct adapter *sc = icc->sc;
887 struct cxgbei_data *ci = sc->iscsi_ulp_softc;
888 struct ppod_region *pr = &ci->pr;
889 struct ppod_reservation *prsv;
891 int xferlen, rc = 0, alias;
893 /* This is for the offload driver's state. Must not be set already. */
897 if (ctsio->ext_data_filled == 0) {
899 struct icl_pdu *ip = io_to_request_pdu(io);
902 struct icl_cxgbei_pdu *icp = ip_to_icp(ip);
904 MPASS(icp->icp_signature == CXGBEI_PDU_SIGNATURE);
905 MPASS(ic == ip->ip_conn);
906 MPASS(ip->ip_bhs_mbuf != NULL);
908 first_burst = icl_pdu_data_segment_length(ip);
911 * Note that ICL calls conn_transfer_setup even if the first
912 * burst had everything and there's nothing left to transfer.
914 MPASS(ctsio->kern_data_len >= first_burst);
915 xferlen = ctsio->kern_data_len;
916 if (xferlen - first_burst < ci->ddp_threshold) {
919 * No DDP for this transfer. Allocate a TTT (based on
920 * the one passed in) that cannot be a valid hardware
921 * DDP tag in the iSCSI region.
923 ttt = *tttp & M_PPOD_TAG;
924 ttt = V_PPOD_TAG(ttt) | pr->pr_invalid_bit;
925 *tttp = htobe32(ttt);
926 MPASS(io_to_ppod_reservation(io) == NULL);
928 counter_u64_add(ci->ddp_setup_error, 1);
932 if (ctsio->kern_sg_entries == 0)
933 buf = (vm_offset_t)ctsio->kern_data_ptr;
934 else if (ctsio->kern_sg_entries == 1) {
935 struct ctl_sg_entry *sgl = (void *)ctsio->kern_data_ptr;
937 MPASS(sgl->len == xferlen);
938 buf = (vm_offset_t)sgl->addr;
940 rc = EAGAIN; /* XXX implement */
946 * Reserve resources for DDP, update the ttt that should be used
947 * in the PDU, and save DDP specific state for this I/O.
950 MPASS(io_to_ppod_reservation(io) == NULL);
951 prsv = uma_zalloc(prsv_zone, M_NOWAIT);
957 rc = t4_alloc_page_pods_for_buf(pr, buf, xferlen, prsv);
959 uma_zfree(prsv_zone, prsv);
963 rc = t4_write_page_pods_for_buf(sc, toep->ofld_txq, toep->tid,
966 t4_free_page_pods(prsv);
967 uma_zfree(prsv_zone, prsv);
971 *tttp = htobe32(prsv->prsv_tag);
972 io_to_ppod_reservation(io) = prsv;
974 counter_u64_add(ci->ddp_setup_ok, 1);
979 * In the middle of an I/O. A non-NULL page pod reservation indicates
980 * that a DDP buffer is being used for the I/O.
983 prsv = io_to_ppod_reservation(ctsio);
987 alias = (prsv->prsv_tag & pr->pr_alias_mask) >> pr->pr_alias_shift;
989 prsv->prsv_tag &= ~pr->pr_alias_mask;
990 prsv->prsv_tag |= alias << pr->pr_alias_shift & pr->pr_alias_mask;
992 *tttp = htobe32(prsv->prsv_tag);
999 icl_cxgbei_conn_transfer_done(struct icl_conn *ic, void *arg)
1001 struct ctl_scsiio *ctsio = arg;
1003 if (ctsio != NULL && ctsio->kern_data_len == ctsio->ext_data_filled) {
1004 struct ppod_reservation *prsv;
1006 prsv = io_to_ppod_reservation(ctsio);
1007 MPASS(prsv != NULL);
1009 t4_free_page_pods(prsv);
1010 uma_zfree(prsv_zone, prsv);
1015 cxgbei_limits(struct adapter *sc, void *arg)
1017 struct icl_drv_limits *idl = arg;
1018 struct cxgbei_data *ci;
1021 if (begin_synchronized_op(sc, NULL, HOLD_LOCK, "t4lims") != 0)
1024 if (uld_active(sc, ULD_ISCSI)) {
1025 ci = sc->iscsi_ulp_softc;
1029 * AHS is not supported by the kernel so we'll not account for
1030 * it either in our PDU len -> data segment len conversions.
1033 max_dsl = ci->max_rx_pdu_len - ISCSI_BHS_SIZE -
1034 ISCSI_HEADER_DIGEST_SIZE - ISCSI_DATA_DIGEST_SIZE;
1035 if (idl->idl_max_recv_data_segment_length > max_dsl)
1036 idl->idl_max_recv_data_segment_length = max_dsl;
1038 max_dsl = ci->max_tx_pdu_len - ISCSI_BHS_SIZE -
1039 ISCSI_HEADER_DIGEST_SIZE - ISCSI_DATA_DIGEST_SIZE;
1040 if (idl->idl_max_send_data_segment_length > max_dsl)
1041 idl->idl_max_send_data_segment_length = max_dsl;
1044 end_synchronized_op(sc, LOCK_HELD);
1048 icl_cxgbei_limits(struct icl_drv_limits *idl)
1051 /* Maximum allowed by the RFC. cxgbei_limits will clip them. */
1052 idl->idl_max_recv_data_segment_length = (1 << 24) - 1;
1053 idl->idl_max_send_data_segment_length = (1 << 24) - 1;
1055 /* These are somewhat arbitrary. */
1056 idl->idl_max_burst_length = 2 * 1024 * 1024;
1057 idl->idl_first_burst_length = 8192;
1059 t4_iterate(cxgbei_limits, idl);
1065 icl_cxgbei_mod_load(void)
1070 * Space to track pagepod reservations.
1072 prsv_zone = uma_zcreate("Pagepod reservations",
1073 sizeof(struct ppod_reservation), NULL, NULL, NULL, NULL,
1074 UMA_ALIGN_CACHE, 0);
1076 refcount_init(&icl_cxgbei_ncons, 0);
1078 rc = icl_register("cxgbei", false, -100, icl_cxgbei_limits,
1079 icl_cxgbei_new_conn);
1085 icl_cxgbei_mod_unload(void)
1088 if (icl_cxgbei_ncons != 0)
1091 icl_unregister("cxgbei", false);
1093 uma_zdestroy(prsv_zone);