1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
4 /* Copyright (c) 2008-2019, IBM Corporation */
6 #include <linux/errno.h>
7 #include <linux/types.h>
9 #include <linux/scatterlist.h>
10 #include <linux/highmem.h>
13 #include <rdma/iw_cm.h>
14 #include <rdma/ib_verbs.h>
15 #include <rdma/ib_user_verbs.h>
18 #include "siw_verbs.h"
21 #define MAX_HDR_INLINE \
22 (((uint32_t)(sizeof(struct siw_rreq_pkt) - \
23 sizeof(struct iwarp_send))) & 0xF8)
25 static struct page *siw_get_pblpage(struct siw_mem *mem, u64 addr, int *idx)
27 struct siw_pbl *pbl = mem->pbl;
28 u64 offset = addr - mem->va;
29 dma_addr_t paddr = siw_pbl_get_buffer(pbl, offset, NULL, idx);
32 return virt_to_page(paddr);
38 * Copy short payload at provided destination payload address
40 static int siw_try_1seg(struct siw_iwarp_tx *c_tx, void *paddr)
42 struct siw_wqe *wqe = &c_tx->wqe_active;
43 struct siw_sge *sge = &wqe->sqe.sge[0];
44 u32 bytes = sge->length;
46 if (bytes > MAX_HDR_INLINE || wqe->sqe.num_sge != 1)
47 return MAX_HDR_INLINE + 1;
52 if (tx_flags(wqe) & SIW_WQE_INLINE) {
53 memcpy(paddr, &wqe->sqe.sge[1], bytes);
55 struct siw_mem *mem = wqe->mem[0];
58 /* Kernel client using kva */
60 (const void *)(uintptr_t)sge->laddr, bytes);
61 } else if (c_tx->in_syscall) {
62 if (copy_from_user(paddr, u64_to_user_ptr(sge->laddr),
66 unsigned int off = sge->laddr & ~PAGE_MASK;
72 p = siw_get_upage(mem->umem, sge->laddr);
74 p = siw_get_pblpage(mem, sge->laddr, &pbl_idx);
81 if (likely(PAGE_SIZE - off >= bytes)) {
82 memcpy(paddr, buffer + off, bytes);
84 unsigned long part = bytes - (PAGE_SIZE - off);
86 memcpy(paddr, buffer + off, part);
90 p = siw_get_upage(mem->umem,
93 p = siw_get_pblpage(mem,
100 memcpy(paddr + part, buffer, bytes - part);
108 #define PKT_FRAGMENTED 1
109 #define PKT_COMPLETE 0
112 * siw_qp_prepare_tx()
114 * Prepare tx state for sending out one fpdu. Builds complete pkt
115 * if no user data or only immediate data are present.
117 * returns PKT_COMPLETE if complete pkt built, PKT_FRAGMENTED otherwise.
119 static int siw_qp_prepare_tx(struct siw_iwarp_tx *c_tx)
121 struct siw_wqe *wqe = &c_tx->wqe_active;
125 switch (tx_type(wqe)) {
127 case SIW_OP_READ_LOCAL_INV:
128 memcpy(&c_tx->pkt.ctrl,
129 &iwarp_pktinfo[RDMAP_RDMA_READ_REQ].ctrl,
130 sizeof(struct iwarp_ctrl));
132 c_tx->pkt.rreq.rsvd = 0;
133 c_tx->pkt.rreq.ddp_qn = htonl(RDMAP_UNTAGGED_QN_RDMA_READ);
134 c_tx->pkt.rreq.ddp_msn =
135 htonl(++c_tx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ]);
136 c_tx->pkt.rreq.ddp_mo = 0;
137 c_tx->pkt.rreq.sink_stag = htonl(wqe->sqe.sge[0].lkey);
138 c_tx->pkt.rreq.sink_to =
139 cpu_to_be64(wqe->sqe.sge[0].laddr);
140 c_tx->pkt.rreq.source_stag = htonl(wqe->sqe.rkey);
141 c_tx->pkt.rreq.source_to = cpu_to_be64(wqe->sqe.raddr);
142 c_tx->pkt.rreq.read_size = htonl(wqe->sqe.sge[0].length);
144 c_tx->ctrl_len = sizeof(struct iwarp_rdma_rreq);
145 crc = (char *)&c_tx->pkt.rreq_pkt.crc;
149 if (tx_flags(wqe) & SIW_WQE_SOLICITED)
150 memcpy(&c_tx->pkt.ctrl,
151 &iwarp_pktinfo[RDMAP_SEND_SE].ctrl,
152 sizeof(struct iwarp_ctrl));
154 memcpy(&c_tx->pkt.ctrl, &iwarp_pktinfo[RDMAP_SEND].ctrl,
155 sizeof(struct iwarp_ctrl));
157 c_tx->pkt.send.ddp_qn = RDMAP_UNTAGGED_QN_SEND;
158 c_tx->pkt.send.ddp_msn =
159 htonl(++c_tx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]);
160 c_tx->pkt.send.ddp_mo = 0;
162 c_tx->pkt.send_inv.inval_stag = 0;
164 c_tx->ctrl_len = sizeof(struct iwarp_send);
166 crc = (char *)&c_tx->pkt.send_pkt.crc;
167 data = siw_try_1seg(c_tx, crc);
170 case SIW_OP_SEND_REMOTE_INV:
171 if (tx_flags(wqe) & SIW_WQE_SOLICITED)
172 memcpy(&c_tx->pkt.ctrl,
173 &iwarp_pktinfo[RDMAP_SEND_SE_INVAL].ctrl,
174 sizeof(struct iwarp_ctrl));
176 memcpy(&c_tx->pkt.ctrl,
177 &iwarp_pktinfo[RDMAP_SEND_INVAL].ctrl,
178 sizeof(struct iwarp_ctrl));
180 c_tx->pkt.send.ddp_qn = RDMAP_UNTAGGED_QN_SEND;
181 c_tx->pkt.send.ddp_msn =
182 htonl(++c_tx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]);
183 c_tx->pkt.send.ddp_mo = 0;
185 c_tx->pkt.send_inv.inval_stag = cpu_to_be32(wqe->sqe.rkey);
187 c_tx->ctrl_len = sizeof(struct iwarp_send_inv);
189 crc = (char *)&c_tx->pkt.send_pkt.crc;
190 data = siw_try_1seg(c_tx, crc);
194 memcpy(&c_tx->pkt.ctrl, &iwarp_pktinfo[RDMAP_RDMA_WRITE].ctrl,
195 sizeof(struct iwarp_ctrl));
197 c_tx->pkt.rwrite.sink_stag = htonl(wqe->sqe.rkey);
198 c_tx->pkt.rwrite.sink_to = cpu_to_be64(wqe->sqe.raddr);
199 c_tx->ctrl_len = sizeof(struct iwarp_rdma_write);
201 crc = (char *)&c_tx->pkt.write_pkt.crc;
202 data = siw_try_1seg(c_tx, crc);
205 case SIW_OP_READ_RESPONSE:
206 memcpy(&c_tx->pkt.ctrl,
207 &iwarp_pktinfo[RDMAP_RDMA_READ_RESP].ctrl,
208 sizeof(struct iwarp_ctrl));
211 c_tx->pkt.rresp.sink_stag = cpu_to_be32(wqe->sqe.rkey);
212 c_tx->pkt.rresp.sink_to = cpu_to_be64(wqe->sqe.raddr);
214 c_tx->ctrl_len = sizeof(struct iwarp_rdma_rresp);
216 crc = (char *)&c_tx->pkt.write_pkt.crc;
217 data = siw_try_1seg(c_tx, crc);
221 siw_dbg_qp(tx_qp(c_tx), "stale wqe type %d\n", tx_type(wqe));
224 if (unlikely(data < 0))
229 if (data <= MAX_HDR_INLINE) {
231 wqe->processed = data;
233 c_tx->pkt.ctrl.mpa_len =
234 htons(c_tx->ctrl_len + data - MPA_HDR_SIZE);
236 /* Add pad, if needed */
237 data += -(int)data & 0x3;
238 /* advance CRC location after payload */
240 c_tx->ctrl_len += data;
242 if (!(c_tx->pkt.ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED))
243 c_tx->pkt.c_untagged.ddp_mo = 0;
245 c_tx->pkt.c_tagged.ddp_to =
246 cpu_to_be64(wqe->sqe.raddr);
251 * Do complete CRC if enabled and short packet
253 if (c_tx->mpa_crc_hd) {
254 crypto_shash_init(c_tx->mpa_crc_hd);
255 if (crypto_shash_update(c_tx->mpa_crc_hd,
259 crypto_shash_final(c_tx->mpa_crc_hd, (u8 *)crc);
261 c_tx->ctrl_len += MPA_CRC_SIZE;
265 c_tx->ctrl_len += MPA_CRC_SIZE;
271 * Allow direct sending out of user buffer if WR is non signalled
272 * and payload is over threshold.
273 * Per RDMA verbs, the application should not change the send buffer
274 * until the work completed. In iWarp, work completion is only
275 * local delivery to TCP. TCP may reuse the buffer for
276 * retransmission. Changing unsent data also breaks the CRC,
279 if (c_tx->zcopy_tx && wqe->bytes >= SENDPAGE_THRESH &&
280 !(tx_flags(wqe) & SIW_WQE_SIGNALLED))
281 c_tx->use_sendpage = 1;
283 c_tx->use_sendpage = 0;
285 return PKT_FRAGMENTED;
289 * Send out one complete control type FPDU, or header of FPDU carrying
290 * data. Used for fixed sized packets like Read.Requests or zero length
291 * SENDs, WRITEs, READ.Responses, or header only.
293 static int siw_tx_ctrl(struct siw_iwarp_tx *c_tx, struct socket *s,
296 struct msghdr msg = { .msg_flags = flags };
297 struct kvec iov = { .iov_base =
298 (char *)&c_tx->pkt.ctrl + c_tx->ctrl_sent,
299 .iov_len = c_tx->ctrl_len - c_tx->ctrl_sent };
301 int rv = kernel_sendmsg(s, &msg, &iov, 1,
302 c_tx->ctrl_len - c_tx->ctrl_sent);
305 c_tx->ctrl_sent += rv;
307 if (c_tx->ctrl_sent == c_tx->ctrl_len)
316 * 0copy TCP transmit interface: Use do_tcp_sendpages.
318 * Using sendpage to push page by page appears to be less efficient
319 * than using sendmsg, even if data are copied.
321 * A general performance limitation might be the extra four bytes
322 * trailer checksum segment to be pushed after user data.
324 static int siw_tcp_sendpages(struct socket *s, struct page **page, int offset,
327 struct sock *sk = s->sk;
328 int i = 0, rv = 0, sent = 0,
329 flags = MSG_MORE | MSG_DONTWAIT | MSG_SENDPAGE_NOTLAST;
332 size_t bytes = min_t(size_t, PAGE_SIZE - offset, size);
334 if (size + offset <= PAGE_SIZE)
335 flags = MSG_MORE | MSG_DONTWAIT;
337 tcp_rate_check_app_limited(sk);
340 rv = do_tcp_sendpages(sk, page[i], offset, bytes, flags);
353 if (rv == -EAGAIN || rv == 0)
365 * Pushes list of pages to TCP socket. If pages from multiple
366 * SGE's, all referenced pages of each SGE are pushed in one
369 static int siw_0copy_tx(struct socket *s, struct page **page,
370 struct siw_sge *sge, unsigned int offset,
373 int i = 0, sent = 0, rv;
374 int sge_bytes = min(sge->length - offset, size);
376 offset = (sge->laddr + offset) & ~PAGE_MASK;
378 while (sent != size) {
379 rv = siw_tcp_sendpages(s, &page[i], offset, sge_bytes);
382 if (size == sent || sge_bytes > rv)
385 i += PAGE_ALIGN(sge_bytes + offset) >> PAGE_SHIFT;
387 sge_bytes = min(sge->length, size - sent);
388 offset = sge->laddr & ~PAGE_MASK;
397 #define MAX_TRAILER (MPA_CRC_SIZE + 4)
399 static void siw_unmap_pages(struct page **pp, unsigned long kmap_mask)
402 if (kmap_mask & BIT(0))
410 * siw_tx_hdt() tries to push a complete packet to TCP where all
411 * packet fragments are referenced by the elements of one iovec.
412 * For the data portion, each involved page must be referenced by
413 * one extra element. All sge's data can be non-aligned to page
414 * boundaries. Two more elements are referencing iWARP header
416 * MAX_ARRAY = 64KB/PAGE_SIZE + 1 + (2 * (SIW_MAX_SGE - 1) + HDR + TRL
418 #define MAX_ARRAY ((0xffff / PAGE_SIZE) + 1 + (2 * (SIW_MAX_SGE - 1) + 2))
421 * Write out iov referencing hdr, data and trailer of current FPDU.
422 * Update transmit state dependent on write return status
424 static int siw_tx_hdt(struct siw_iwarp_tx *c_tx, struct socket *s)
426 struct siw_wqe *wqe = &c_tx->wqe_active;
427 struct siw_sge *sge = &wqe->sqe.sge[c_tx->sge_idx];
428 struct kvec iov[MAX_ARRAY];
429 struct page *page_array[MAX_ARRAY];
430 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_EOR };
432 int seg = 0, do_crc = c_tx->do_crc, is_kva = 0, rv;
433 unsigned int data_len = c_tx->bytes_unsent, hdr_len = 0, trl_len = 0,
434 sge_off = c_tx->sge_off, sge_idx = c_tx->sge_idx,
435 pbl_idx = c_tx->pbl_idx;
436 unsigned long kmap_mask = 0L;
438 if (c_tx->state == SIW_SEND_HDR) {
439 if (c_tx->use_sendpage) {
440 rv = siw_tx_ctrl(c_tx, s, MSG_DONTWAIT | MSG_MORE);
444 c_tx->state = SIW_SEND_DATA;
447 (char *)&c_tx->pkt.ctrl + c_tx->ctrl_sent;
448 iov[0].iov_len = hdr_len =
449 c_tx->ctrl_len - c_tx->ctrl_sent;
454 wqe->processed += data_len;
456 while (data_len) { /* walk the list of SGE's */
457 unsigned int sge_len = min(sge->length - sge_off, data_len);
458 unsigned int fp_off = (sge->laddr + sge_off) & ~PAGE_MASK;
461 if (!(tx_flags(wqe) & SIW_WQE_INLINE)) {
462 mem = wqe->mem[sge_idx];
463 is_kva = mem->mem_obj == NULL ? 1 : 0;
467 if (is_kva && !c_tx->use_sendpage) {
469 * tx from kernel virtual address: either inline data
470 * or memory region with assigned kernel buffer
473 (void *)(uintptr_t)(sge->laddr + sge_off);
474 iov[seg].iov_len = sge_len;
477 crypto_shash_update(c_tx->mpa_crc_hd,
487 size_t plen = min((int)PAGE_SIZE - fp_off, sge_len);
494 mem, sge->laddr + sge_off,
497 p = siw_get_upage(mem->umem,
498 sge->laddr + sge_off);
500 siw_unmap_pages(page_array, kmap_mask);
501 wqe->processed -= c_tx->bytes_unsent;
507 if (!c_tx->use_sendpage) {
508 iov[seg].iov_base = kmap(p) + fp_off;
509 iov[seg].iov_len = plen;
511 /* Remember for later kunmap() */
512 kmap_mask |= BIT(seg);
520 crypto_shash_update(c_tx->mpa_crc_hd,
526 u64 va = sge->laddr + sge_off;
528 page_array[seg] = virt_to_page(va & PAGE_MASK);
532 (void *)(uintptr_t)va,
541 if (++seg > (int)MAX_ARRAY) {
542 siw_dbg_qp(tx_qp(c_tx), "to many fragments\n");
543 siw_unmap_pages(page_array, kmap_mask);
544 wqe->processed -= c_tx->bytes_unsent;
550 /* Update SGE variables at end of SGE */
551 if (sge_off == sge->length &&
552 (data_len != 0 || wqe->processed < wqe->bytes)) {
559 if (likely(c_tx->state != SIW_SEND_TRAILER)) {
560 iov[seg].iov_base = &c_tx->trailer.pad[4 - c_tx->pad];
561 iov[seg].iov_len = trl_len = MAX_TRAILER - (4 - c_tx->pad);
563 iov[seg].iov_base = &c_tx->trailer.pad[c_tx->ctrl_sent];
564 iov[seg].iov_len = trl_len = MAX_TRAILER - c_tx->ctrl_sent;
568 *(u32 *)c_tx->trailer.pad = 0;
570 crypto_shash_update(c_tx->mpa_crc_hd,
571 (u8 *)&c_tx->trailer.crc - c_tx->pad,
574 if (!c_tx->mpa_crc_hd)
575 c_tx->trailer.crc = 0;
577 crypto_shash_final(c_tx->mpa_crc_hd, (u8 *)&c_tx->trailer.crc);
579 data_len = c_tx->bytes_unsent;
581 if (c_tx->use_sendpage) {
582 rv = siw_0copy_tx(s, page_array, &wqe->sqe.sge[c_tx->sge_idx],
583 c_tx->sge_off, data_len);
584 if (rv == data_len) {
585 rv = kernel_sendmsg(s, &msg, &iov[seg], 1, trl_len);
592 rv = kernel_sendmsg(s, &msg, iov, seg + 1,
593 hdr_len + data_len + trl_len);
594 siw_unmap_pages(page_array, kmap_mask);
596 if (rv < (int)hdr_len) {
597 /* Not even complete hdr pushed or negative rv */
598 wqe->processed -= data_len;
600 c_tx->ctrl_sent += rv;
607 if (rv >= (int)data_len) {
608 /* all user data pushed to TCP or no data to push */
609 if (data_len > 0 && wqe->processed < wqe->bytes) {
610 /* Save the current state for next tx */
611 c_tx->sge_idx = sge_idx;
612 c_tx->sge_off = sge_off;
613 c_tx->pbl_idx = pbl_idx;
617 if (rv == trl_len) /* all pushed */
620 c_tx->state = SIW_SEND_TRAILER;
621 c_tx->ctrl_len = MAX_TRAILER;
622 c_tx->ctrl_sent = rv + 4 - c_tx->pad;
623 c_tx->bytes_unsent = 0;
627 } else if (data_len > 0) {
628 /* Maybe some user data pushed to TCP */
629 c_tx->state = SIW_SEND_DATA;
630 wqe->processed -= data_len - rv;
634 * Some bytes out. Recompute tx state based
635 * on old state and bytes pushed
637 unsigned int sge_unsent;
639 c_tx->bytes_unsent -= rv;
640 sge = &wqe->sqe.sge[c_tx->sge_idx];
641 sge_unsent = sge->length - c_tx->sge_off;
643 while (sge_unsent <= rv) {
648 sge_unsent = sge->length;
660 static void siw_update_tcpseg(struct siw_iwarp_tx *c_tx,
663 struct tcp_sock *tp = tcp_sk(s->sk);
666 if (c_tx->gso_seg_limit == 0)
667 c_tx->tcp_seglen = tp->mss_cache * tp->gso_segs;
671 min_t(u16, c_tx->gso_seg_limit, tp->gso_segs);
673 c_tx->tcp_seglen = tp->mss_cache;
675 /* Loopback may give odd numbers */
676 c_tx->tcp_seglen &= 0xfffffff8;
682 * Prepares transmit context to send out one FPDU if FPDU will contain
683 * user data and user data are not immediate data.
684 * Computes maximum FPDU length to fill up TCP MSS if possible.
686 * @qp: QP from which to transmit
687 * @wqe: Current WQE causing transmission
689 * TODO: Take into account real available sendspace on socket
690 * to avoid header misalignment due to send pausing within
693 static void siw_prepare_fpdu(struct siw_qp *qp, struct siw_wqe *wqe)
695 struct siw_iwarp_tx *c_tx = &qp->tx_ctx;
699 iwarp_pktinfo[__rdmap_get_opcode(&c_tx->pkt.ctrl)].hdr_len;
703 * Update target buffer offset if any
705 if (!(c_tx->pkt.ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED))
706 /* Untagged message */
707 c_tx->pkt.c_untagged.ddp_mo = cpu_to_be32(wqe->processed);
708 else /* Tagged message */
709 c_tx->pkt.c_tagged.ddp_to =
710 cpu_to_be64(wqe->sqe.raddr + wqe->processed);
712 data_len = wqe->bytes - wqe->processed;
713 if (data_len + c_tx->ctrl_len + MPA_CRC_SIZE > c_tx->tcp_seglen) {
714 /* Trim DDP payload to fit into current TCP segment */
715 data_len = c_tx->tcp_seglen - (c_tx->ctrl_len + MPA_CRC_SIZE);
716 c_tx->pkt.ctrl.ddp_rdmap_ctrl &= ~DDP_FLAG_LAST;
719 c_tx->pkt.ctrl.ddp_rdmap_ctrl |= DDP_FLAG_LAST;
720 c_tx->pad = -data_len & 0x3;
722 c_tx->bytes_unsent = data_len;
724 c_tx->pkt.ctrl.mpa_len =
725 htons(c_tx->ctrl_len + data_len - MPA_HDR_SIZE);
728 * Init MPA CRC computation
730 if (c_tx->mpa_crc_hd) {
731 crypto_shash_init(c_tx->mpa_crc_hd);
732 crypto_shash_update(c_tx->mpa_crc_hd, (u8 *)&c_tx->pkt,
741 * Check permissions for a list of SGE's (SGL).
742 * A successful check will have all memory referenced
743 * for transmission resolved and assigned to the WQE.
745 * @pd: Protection Domain SGL should belong to
746 * @wqe: WQE to be checked
747 * @perms: requested access permissions
751 static int siw_check_sgl_tx(struct ib_pd *pd, struct siw_wqe *wqe,
752 enum ib_access_flags perms)
754 struct siw_sge *sge = &wqe->sqe.sge[0];
755 int i, len, num_sge = wqe->sqe.num_sge;
757 if (unlikely(num_sge > SIW_MAX_SGE))
760 for (i = 0, len = 0; num_sge; num_sge--, i++, sge++) {
762 * rdma verbs: do not check stag for a zero length sge
765 int rv = siw_check_sge(pd, sge, &wqe->mem[i], perms, 0,
768 if (unlikely(rv != E_ACCESS_OK))
777 * siw_qp_sq_proc_tx()
779 * Process one WQE which needs transmission on the wire.
781 static int siw_qp_sq_proc_tx(struct siw_qp *qp, struct siw_wqe *wqe)
783 struct siw_iwarp_tx *c_tx = &qp->tx_ctx;
784 struct socket *s = qp->attrs.sk;
785 int rv = 0, burst_len = qp->tx_ctx.burst;
786 enum rdmap_ecode ecode = RDMAP_ECODE_CATASTROPHIC_STREAM;
788 if (unlikely(wqe->wr_status == SIW_WR_IDLE))
792 burst_len = SQ_USER_MAXBURST;
794 if (wqe->wr_status == SIW_WR_QUEUED) {
795 if (!(wqe->sqe.flags & SIW_WQE_INLINE)) {
796 if (tx_type(wqe) == SIW_OP_READ_RESPONSE)
797 wqe->sqe.num_sge = 1;
799 if (tx_type(wqe) != SIW_OP_READ &&
800 tx_type(wqe) != SIW_OP_READ_LOCAL_INV) {
802 * Reference memory to be tx'd w/o checking
803 * access for LOCAL_READ permission, since
804 * not defined in RDMA core.
806 rv = siw_check_sgl_tx(qp->pd, wqe, 0);
809 SIW_OP_READ_RESPONSE)
810 ecode = siw_rdmap_error(-rv);
819 wqe->bytes = wqe->sqe.sge[0].length;
820 if (!rdma_is_kernel_res(&qp->base_qp.res)) {
821 if (wqe->bytes > SIW_MAX_INLINE) {
825 wqe->sqe.sge[0].laddr =
826 (u64)(uintptr_t)&wqe->sqe.sge[1];
829 wqe->wr_status = SIW_WR_INPROGRESS;
832 siw_update_tcpseg(c_tx, s);
834 rv = siw_qp_prepare_tx(c_tx);
835 if (rv == PKT_FRAGMENTED) {
836 c_tx->state = SIW_SEND_HDR;
837 siw_prepare_fpdu(qp, wqe);
838 } else if (rv == PKT_COMPLETE) {
839 c_tx->state = SIW_SEND_SHORT_FPDU;
846 siw_dbg_qp(qp, "wr type %d, state %d, data %u, sent %u, id %llx\n",
847 tx_type(wqe), wqe->wr_status, wqe->bytes, wqe->processed,
850 if (--burst_len == 0) {
854 if (c_tx->state == SIW_SEND_SHORT_FPDU) {
855 enum siw_opcode tx_type = tx_type(wqe);
856 unsigned int msg_flags;
858 if (siw_sq_empty(qp) || !siw_tcp_nagle || burst_len == 1)
860 * End current TCP segment, if SQ runs empty,
861 * or siw_tcp_nagle is not set, or we bail out
862 * soon due to no burst credit left.
864 msg_flags = MSG_DONTWAIT;
866 msg_flags = MSG_DONTWAIT | MSG_MORE;
868 rv = siw_tx_ctrl(c_tx, s, msg_flags);
870 if (!rv && tx_type != SIW_OP_READ &&
871 tx_type != SIW_OP_READ_LOCAL_INV)
872 wqe->processed = wqe->bytes;
877 rv = siw_tx_hdt(c_tx, s);
881 * One segment sent. Processing completed if last
882 * segment, Do next segment otherwise.
884 if (unlikely(c_tx->tx_suspend)) {
886 * Verbs, 6.4.: Try stopping sending after a full
887 * DDP segment if the connection goes down
888 * (== peer halfclose)
893 if (c_tx->pkt.ctrl.ddp_rdmap_ctrl & DDP_FLAG_LAST) {
894 siw_dbg_qp(qp, "WQE completed\n");
897 c_tx->state = SIW_SEND_HDR;
899 siw_update_tcpseg(c_tx, s);
901 siw_prepare_fpdu(qp, wqe);
905 qp->tx_ctx.burst = burst_len;
909 if (ecode != RDMAP_ECODE_CATASTROPHIC_STREAM)
910 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
911 RDMAP_ETYPE_REMOTE_PROTECTION, ecode, 1);
913 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
914 RDMAP_ETYPE_CATASTROPHIC,
915 RDMAP_ECODE_UNSPECIFIED, 1);
919 static int siw_fastreg_mr(struct ib_pd *pd, struct siw_sqe *sqe)
921 struct ib_mr *base_mr = (struct ib_mr *)(uintptr_t)sqe->base_mr;
922 struct siw_device *sdev = to_siw_dev(pd->device);
926 siw_dbg_pd(pd, "STag 0x%08x\n", sqe->rkey);
928 if (unlikely(!base_mr)) {
929 pr_warn("siw: fastreg: STag 0x%08x unknown\n", sqe->rkey);
933 if (unlikely(base_mr->rkey >> 8 != sqe->rkey >> 8)) {
934 pr_warn("siw: fastreg: STag 0x%08x: bad MR\n", sqe->rkey);
938 mem = siw_mem_id2obj(sdev, sqe->rkey >> 8);
939 if (unlikely(!mem)) {
940 pr_warn("siw: fastreg: STag 0x%08x unknown\n", sqe->rkey);
944 if (unlikely(mem->pd != pd)) {
945 pr_warn("siw: fastreg: PD mismatch\n");
949 if (unlikely(mem->stag_valid)) {
950 pr_warn("siw: fastreg: STag 0x%08x already valid\n", sqe->rkey);
954 /* Refresh STag since user may have changed key part */
955 mem->stag = sqe->rkey;
956 mem->perms = sqe->access;
958 siw_dbg_mem(mem, "STag 0x%08x now valid\n", sqe->rkey);
959 mem->va = base_mr->iova;
966 static int siw_qp_sq_proc_local(struct siw_qp *qp, struct siw_wqe *wqe)
970 switch (tx_type(wqe)) {
972 rv = siw_fastreg_mr(qp->pd, &wqe->sqe);
975 case SIW_OP_INVAL_STAG:
976 rv = siw_invalidate_stag(qp->pd, wqe->sqe.rkey);
986 * siw_qp_sq_process()
988 * Core TX path routine for RDMAP/DDP/MPA using a TCP kernel socket.
989 * Sends RDMAP payload for the current SQ WR @wqe of @qp in one or more
990 * MPA FPDUs, each containing a DDP segment.
992 * SQ processing may occur in user context as a result of posting
993 * new WQE's or from siw_sq_work_handler() context. Processing in
994 * user context is limited to non-kernel verbs users.
996 * SQ processing may get paused anytime, possibly in the middle of a WR
997 * or FPDU, if insufficient send space is available. SQ processing
998 * gets resumed from siw_sq_work_handler(), if send space becomes
1001 * Must be called with the QP state read-locked.
1004 * An outbound RREQ can be satisfied by the corresponding RRESP
1005 * _before_ it gets assigned to the ORQ. This happens regularly
1006 * in RDMA READ via loopback case. Since both outbound RREQ and
1007 * inbound RRESP can be handled by the same CPU, locking the ORQ
1008 * is dead-lock prone and thus not an option. With that, the
1009 * RREQ gets assigned to the ORQ _before_ being sent - see
1010 * siw_activate_tx() - and pulled back in case of send failure.
1012 int siw_qp_sq_process(struct siw_qp *qp)
1014 struct siw_wqe *wqe = tx_wqe(qp);
1015 enum siw_opcode tx_type;
1016 unsigned long flags;
1019 siw_dbg_qp(qp, "enter for type %d\n", tx_type(wqe));
1023 * Stop QP processing if SQ state changed
1025 if (unlikely(qp->tx_ctx.tx_suspend)) {
1026 siw_dbg_qp(qp, "tx suspended\n");
1029 tx_type = tx_type(wqe);
1031 if (tx_type <= SIW_OP_READ_RESPONSE)
1032 rv = siw_qp_sq_proc_tx(qp, wqe);
1034 rv = siw_qp_sq_proc_local(qp, wqe);
1038 * WQE processing done
1042 case SIW_OP_SEND_REMOTE_INV:
1044 siw_wqe_put_mem(wqe, tx_type);
1047 case SIW_OP_INVAL_STAG:
1049 if (tx_flags(wqe) & SIW_WQE_SIGNALLED)
1050 siw_sqe_complete(qp, &wqe->sqe, wqe->bytes,
1055 case SIW_OP_READ_LOCAL_INV:
1057 * already enqueued to ORQ queue
1061 case SIW_OP_READ_RESPONSE:
1062 siw_wqe_put_mem(wqe, tx_type);
1066 WARN(1, "undefined WQE type %d\n", tx_type);
1071 spin_lock_irqsave(&qp->sq_lock, flags);
1072 wqe->wr_status = SIW_WR_IDLE;
1073 rv = siw_activate_tx(qp);
1074 spin_unlock_irqrestore(&qp->sq_lock, flags);
1081 } else if (rv == -EAGAIN) {
1082 siw_dbg_qp(qp, "sq paused: hd/tr %d of %d, data %d\n",
1083 qp->tx_ctx.ctrl_sent, qp->tx_ctx.ctrl_len,
1084 qp->tx_ctx.bytes_unsent);
1087 } else if (rv == -EINPROGRESS) {
1088 rv = siw_sq_start(qp);
1092 * WQE processing failed.
1094 * o It turns any WQE into a signalled WQE.
1095 * o Local catastrophic error must be surfaced
1096 * o QP must be moved into Terminate state: done by code
1097 * doing socket state change processing
1099 * o TODO: Termination message must be sent.
1100 * o TODO: Implement more precise work completion errors,
1101 * see enum ib_wc_status in ib_verbs.h
1103 siw_dbg_qp(qp, "wqe type %d processing failed: %d\n",
1106 spin_lock_irqsave(&qp->sq_lock, flags);
1108 * RREQ may have already been completed by inbound RRESP!
1110 if (tx_type == SIW_OP_READ ||
1111 tx_type == SIW_OP_READ_LOCAL_INV) {
1112 /* Cleanup pending entry in ORQ */
1114 qp->orq[qp->orq_put % qp->attrs.orq_size].flags = 0;
1116 spin_unlock_irqrestore(&qp->sq_lock, flags);
1118 * immediately suspends further TX processing
1120 if (!qp->tx_ctx.tx_suspend)
1121 siw_qp_cm_drop(qp, 0);
1125 case SIW_OP_SEND_REMOTE_INV:
1126 case SIW_OP_SEND_WITH_IMM:
1129 case SIW_OP_READ_LOCAL_INV:
1130 siw_wqe_put_mem(wqe, tx_type);
1133 case SIW_OP_INVAL_STAG:
1135 siw_sqe_complete(qp, &wqe->sqe, wqe->bytes,
1136 SIW_WC_LOC_QP_OP_ERR);
1138 siw_qp_event(qp, IB_EVENT_QP_FATAL);
1142 case SIW_OP_READ_RESPONSE:
1143 siw_dbg_qp(qp, "proc. read.response failed: %d\n", rv);
1145 siw_qp_event(qp, IB_EVENT_QP_REQ_ERR);
1147 siw_wqe_put_mem(wqe, SIW_OP_READ_RESPONSE);
1152 WARN(1, "undefined WQE type %d\n", tx_type);
1155 wqe->wr_status = SIW_WR_IDLE;
1161 static void siw_sq_resume(struct siw_qp *qp)
1163 if (down_read_trylock(&qp->state_lock)) {
1164 if (likely(qp->attrs.state == SIW_QP_STATE_RTS &&
1165 !qp->tx_ctx.tx_suspend)) {
1166 int rv = siw_qp_sq_process(qp);
1168 up_read(&qp->state_lock);
1170 if (unlikely(rv < 0)) {
1171 siw_dbg_qp(qp, "SQ task failed: err %d\n", rv);
1173 if (!qp->tx_ctx.tx_suspend)
1174 siw_qp_cm_drop(qp, 0);
1177 up_read(&qp->state_lock);
1180 siw_dbg_qp(qp, "Resume SQ while QP locked\n");
1186 struct llist_head active;
1187 wait_queue_head_t waiting;
1190 static DEFINE_PER_CPU(struct tx_task_t, siw_tx_task_g);
1192 void siw_stop_tx_thread(int nr_cpu)
1194 kthread_stop(siw_tx_thread[nr_cpu]);
1195 wake_up(&per_cpu(siw_tx_task_g, nr_cpu).waiting);
1198 int siw_run_sq(void *data)
1200 const int nr_cpu = (unsigned int)(long)data;
1201 struct llist_node *active;
1203 struct tx_task_t *tx_task = &per_cpu(siw_tx_task_g, nr_cpu);
1205 init_llist_head(&tx_task->active);
1206 init_waitqueue_head(&tx_task->waiting);
1209 struct llist_node *fifo_list = NULL;
1211 wait_event_interruptible(tx_task->waiting,
1212 !llist_empty(&tx_task->active) ||
1213 kthread_should_stop());
1215 if (kthread_should_stop())
1218 active = llist_del_all(&tx_task->active);
1220 * llist_del_all returns a list with newest entry first.
1221 * Re-order list for fairness among QP's.
1224 struct llist_node *tmp = active;
1226 active = llist_next(active);
1227 tmp->next = fifo_list;
1231 qp = container_of(fifo_list, struct siw_qp, tx_list);
1232 fifo_list = llist_next(fifo_list);
1233 qp->tx_list.next = NULL;
1238 active = llist_del_all(&tx_task->active);
1240 llist_for_each_entry(qp, active, tx_list) {
1241 qp->tx_list.next = NULL;
1248 int siw_sq_start(struct siw_qp *qp)
1250 if (tx_wqe(qp)->wr_status == SIW_WR_IDLE)
1253 if (unlikely(!cpu_online(qp->tx_cpu))) {
1254 siw_put_tx_cpu(qp->tx_cpu);
1255 qp->tx_cpu = siw_get_tx_cpu(qp->sdev);
1256 if (qp->tx_cpu < 0) {
1257 pr_warn("siw: no tx cpu available\n");
1264 llist_add(&qp->tx_list, &per_cpu(siw_tx_task_g, qp->tx_cpu).active);
1266 wake_up(&per_cpu(siw_tx_task_g, qp->tx_cpu).waiting);