[PATCH rdma-next 21/29] IB/rxe: QP request handling

Moni Shoua
2016-06-02T16:57:29Z

Send queue (SQ) logic implementation.

Signed-off-by: Kamal Heib <kamalh-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Amir Vadai <amirv-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Moni Shoua <monis-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/hw/rxe/rxe_req.c | 675 ++++++++++++++++++++++++++++++++++++
1 file changed, 675 insertions(+)
create mode 100644 drivers/infiniband/hw/rxe/rxe_req.c

diff --git a/drivers/infiniband/hw/rxe/rxe_req.c b/drivers/infiniband/hw/rxe/rxe_req.c
new file mode 100644
index 0000000..7d113db
--- /dev/null
+++ b/drivers/infiniband/hw/rxe/rxe_req.c
@@ -0,0 +1,675 @@
+/*
+ * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/skbuff.h>
+
+#include "rxe.h"
+#include "rxe_loc.h"
+#include "rxe_queue.h"
+
+static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
+ unsigned opcode);
+
+static inline void retry_first_write_send(struct rxe_qp *qp,
+ struct rxe_send_wqe *wqe,
+ unsigned mask, int npsn)
+{
+ int i;
+
+ for (i = 0; i < npsn; i++) {
+ int to_send = (wqe->dma.resid > qp->mtu) ?
+ qp->mtu : wqe->dma.resid;
+
+ qp->req.opcode = next_opcode(qp, wqe,
+ wqe->wr.opcode);
+
+ if (wqe->wr.send_flags & IB_SEND_INLINE) {
+ wqe->dma.resid -= to_send;
+ wqe->dma.sge_offset += to_send;
+ } else {
+ advance_dma_data(&wqe->dma, to_send);
+ }
+ if (mask & WR_WRITE_MASK)
+ wqe->iova += qp->mtu;
+ }
+}
+
+static void req_retry(struct rxe_qp *qp)
+{
+ struct rxe_send_wqe *wqe;
+ unsigned int wqe_index;
+ unsigned int mask;
+ int npsn;
+ int first = 1;
+
+ wqe = queue_head(qp->sq.queue);
+ npsn = (qp->comp.psn - wqe->first_psn) & BTH_PSN_MASK;
+
+ qp->req.wqe_index = consumer_index(qp->sq.queue);
+ qp->req.psn = qp->comp.psn;
+ qp->req.opcode = -1;
+
+ for (wqe_index = consumer_index(qp->sq.queue);
+ wqe_index != producer_index(qp->sq.queue);
+ wqe_index = next_index(qp->sq.queue, wqe_index)) {
+ wqe = addr_from_index(qp->sq.queue, wqe_index);
+ mask = wr_opcode_mask(wqe->wr.opcode, qp);
+
+ if (wqe->state == wqe_state_posted)
+ break;
+
+ if (wqe->state == wqe_state_done)
+ continue;
+
+ wqe->iova = (mask & WR_ATOMIC_MASK) ?
+ wqe->wr.wr.atomic.remote_addr :
+ (mask & WR_READ_OR_WRITE_MASK) ?
+ wqe->wr.wr.rdma.remote_addr :
+ 0;
+
+ if (!first || (mask & WR_READ_MASK) == 0) {
+ wqe->dma.resid = wqe->dma.length;
+ wqe->dma.cur_sge = 0;
+ wqe->dma.sge_offset = 0;
+ }
+
+ if (first) {
+ first = 0;
+
+ if (mask & WR_WRITE_OR_SEND_MASK)
+ retry_first_write_send(qp, wqe, mask, npsn);
+
+ if (mask & WR_READ_MASK)
+ wqe->iova += npsn * qp->mtu;
+ }
+
+ wqe->state = wqe_state_posted;
+ }
+}
+
+void rnr_nak_timer(unsigned long data)
+{
+ struct rxe_qp *qp = (struct rxe_qp *)data;
+
+ pr_debug("rnr nak timer fired\n");
+ rxe_run_task(&qp->req.task, 1);
+}
+
+static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp)
+{
+ struct rxe_send_wqe *wqe = queue_head(qp->sq.queue);
+ unsigned long flags;
+
+ if (unlikely(qp->req.state == QP_STATE_DRAIN)) {
+ /* check to see if we are drained;
+ * state_lock used by requester and completer
+ */
+ spin_lock_irqsave(&qp->state_lock, flags);
+ do {
+ if (qp->req.state != QP_STATE_DRAIN) {
+ /* comp just finished */
+ spin_unlock_irqrestore(&qp->state_lock,
+ flags);
+ break;
+ }
+
+ if (wqe && ((qp->req.wqe_index !=
+ consumer_index(qp->sq.queue)) ||
+ (wqe->state != wqe_state_posted))) {
+ /* comp not done yet */
+ spin_unlock_irqrestore(&qp->state_lock,
+ flags);
+ break;
+ }
+
+ qp->req.state = QP_STATE_DRAINED;
+ spin_unlock_irqrestore(&qp->state_lock, flags);
+
+ if (qp->ibqp.event_handler) {
+ struct ib_event ev;
+
+ ev.device = qp->ibqp.device;
+ ev.element.qp = &qp->ibqp;
+ ev.event = IB_EVENT_SQ_DRAINED;
+ qp->ibqp.event_handler(&ev,
+ qp->ibqp.qp_context);
+ }
+ } while (0);
+ }
+
+ if (qp->req.wqe_index == producer_index(qp->sq.queue))
+ return NULL;
+
+ wqe = addr_from_index(qp->sq.queue, qp->req.wqe_index);
+
+ if (unlikely((qp->req.state == QP_STATE_DRAIN ||
+ qp->req.state == QP_STATE_DRAINED) &&
+ (wqe->state != wqe_state_processing)))
+ return NULL;
+
+ if (unlikely((wqe->wr.send_flags & IB_SEND_FENCE) &&
+ (qp->req.wqe_index != consumer_index(qp->sq.queue)))) {
+ qp->req.wait_fence = 1;
+ return NULL;
+ }
+
+ wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp);
+ return wqe;
+}
+
+static int next_opcode_rc(struct rxe_qp *qp, unsigned opcode, int fits)
+{
+ switch (opcode) {
+ case IB_WR_RDMA_WRITE:
+ if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
+ qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
+ return fits ?
+ IB_OPCODE_RC_RDMA_WRITE_LAST :
+ IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
+ else
+ return fits ?
+ IB_OPCODE_RC_RDMA_WRITE_ONLY :
+ IB_OPCODE_RC_RDMA_WRITE_FIRST;
+
+ case IB_WR_RDMA_WRITE_WITH_IMM:
+ if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
+ qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
+ return fits ?
+ IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
+ IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
+ else
+ return fits ?
+ IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
+ IB_OPCODE_RC_RDMA_WRITE_FIRST;
+
+ case IB_WR_SEND:
+ if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
+ qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
+ return fits ?
+ IB_OPCODE_RC_SEND_LAST :
+ IB_OPCODE_RC_SEND_MIDDLE;
+ else
+ return fits ?
+ IB_OPCODE_RC_SEND_ONLY :
+ IB_OPCODE_RC_SEND_FIRST;
+
+ case IB_WR_SEND_WITH_IMM:
+ if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
+ qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
+ return fits ?
+ IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE :
+ IB_OPCODE_RC_SEND_MIDDLE;
+ else
+ return fits ?
+ IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE :
+ IB_OPCODE_RC_SEND_FIRST;
+
+ case IB_WR_RDMA_READ:
+ return IB_OPCODE_RC_RDMA_READ_REQUEST;
+
+ case IB_WR_ATOMIC_CMP_AND_SWP:
+ return IB_OPCODE_RC_COMPARE_SWAP;
+
+ case IB_WR_ATOMIC_FETCH_AND_ADD:
+ return IB_OPCODE_RC_FETCH_ADD;
+
+ case IB_WR_SEND_WITH_INV:
+ if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
+ qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
+ return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE :
+ IB_OPCODE_RC_SEND_MIDDLE;
+ else
+ return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE :
+ IB_OPCODE_RC_SEND_FIRST;
+ }
+
+ return -EINVAL;
+}
+
+static int next_opcode_uc(struct rxe_qp *qp, unsigned opcode, int fits)
+{
+ switch (opcode) {
+ case IB_WR_RDMA_WRITE:
+ if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
+ qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
+ return fits ?
+ IB_OPCODE_UC_RDMA_WRITE_LAST :
+ IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
+ else
+ return fits ?
+ IB_OPCODE_UC_RDMA_WRITE_ONLY :
+ IB_OPCODE_UC_RDMA_WRITE_FIRST;
+
+ case IB_WR_RDMA_WRITE_WITH_IMM:
+ if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
+ qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
+ return fits ?
+ IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
+ IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
+ else
+ return fits ?
+ IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
+ IB_OPCODE_UC_RDMA_WRITE_FIRST;
+
+ case IB_WR_SEND:
+ if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
+ qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
+ return fits ?
+ IB_OPCODE_UC_SEND_LAST :
+ IB_OPCODE_UC_SEND_MIDDLE;
+ else
+ return fits ?
+ IB_OPCODE_UC_SEND_ONLY :
+ IB_OPCODE_UC_SEND_FIRST;
+
+ case IB_WR_SEND_WITH_IMM:
+ if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
+ qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
+ return fits ?
+ IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE :
+ IB_OPCODE_UC_SEND_MIDDLE;
+ else
+ return fits ?
+ IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE :
+ IB_OPCODE_UC_SEND_FIRST;
+ }
+
+ return -EINVAL;
+}
+
+static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
+ unsigned opcode)
+{
+ int fits = (wqe->dma.resid <= qp->mtu);
+
+ switch (qp_type(qp)) {
+ case IB_QPT_RC:
+ return next_opcode_rc(qp, opcode, fits);
+
+ case IB_QPT_UC:
+ return next_opcode_uc(qp, opcode, fits);
+
+ case IB_QPT_SMI:
+ case IB_QPT_UD:
+ case IB_QPT_GSI:
+ switch (opcode) {
+ case IB_WR_SEND:
+ return IB_OPCODE_UD_SEND_ONLY;
+
+ case IB_WR_SEND_WITH_IMM:
+ return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
+{
+ int depth;
+
+ if (wqe->has_rd_atomic)
+ return 0;
+
+ qp->req.need_rd_atomic = 1;
+ depth = atomic_dec_return(&qp->req.rd_atomic);
+
+ if (depth >= 0) {
+ qp->req.need_rd_atomic = 0;
+ wqe->has_rd_atomic = 1;
+ return 0;
+ }
+
+ atomic_inc(&qp->req.rd_atomic);
+ return -EAGAIN;
+}
+
+static inline int get_mtu(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
+{
+ struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
+ struct rxe_port *port;
+ struct rxe_av *av;
+
+ if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC))
+ return qp->mtu;
+
+ av = &wqe->av;
+ port = &rxe->port[av->port_num - 1];
+
+ return port->mtu_cap;
+}
+
+static struct sk_buff *init_req_packet(struct rxe_qp *qp,
+ struct rxe_send_wqe *wqe,
+ int opcode, int payload,
+ struct rxe_pkt_info *pkt)
+{
+ struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
+ struct rxe_port *port = &rxe->port[qp->attr.port_num - 1];
+ struct sk_buff *skb;
+ struct rxe_send_wr *ibwr = &wqe->wr;
+ struct rxe_av *av;
+ int pad = (-payload) & 0x3;
+ int paylen;
+ int solicited;
+ u16 pkey;
+ u32 qp_num;
+ int ack_req;
+
+ /* length from start of bth to end of icrc */
+ paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
+
+ /* pkt->hdr, rxe, port_num and mask are initialized in ifc
+ * layer
+ */
+ pkt->opcode = opcode;
+ pkt->qp = qp;
+ pkt->psn = qp->req.psn;
+ pkt->mask = rxe_opcode[opcode].mask;
+ pkt->paylen = paylen;
+ pkt->offset = 0;
+ pkt->wqe = wqe;
+
+ /* init skb */
+ av = rxe_get_av(pkt);
+ skb = rxe->ifc_ops->init_packet(rxe, av, paylen, pkt);
+ if (unlikely(!skb))
+ return NULL;
+
+ /* init bth */
+ solicited = (ibwr->send_flags & IB_SEND_SOLICITED) &&
+ (pkt->mask & RXE_END_MASK) &&
+ ((pkt->mask & (RXE_SEND_MASK)) ||
+ (pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) ==
+ (RXE_WRITE_MASK | RXE_IMMDT_MASK));
+
+ pkey = (qp_type(qp) == IB_QPT_GSI) ?
+ port->pkey_tbl[ibwr->wr.ud.pkey_index] :
+ port->pkey_tbl[qp->attr.pkey_index];
+
+ qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn :
+ qp->attr.dest_qp_num;
+
+ ack_req = ((pkt->mask & RXE_END_MASK) ||
+ (qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK));
+ if (ack_req)
+ qp->req.noack_pkts = 0;
+
+ bth_init(pkt, pkt->opcode, solicited, 0, pad, pkey, qp_num,
+ ack_req, pkt->psn);
+
+ /* init optional headers */
+ if (pkt->mask & RXE_RETH_MASK) {
+ reth_set_rkey(pkt, ibwr->wr.rdma.rkey);
+ reth_set_va(pkt, wqe->iova);
+ reth_set_len(pkt, wqe->dma.length);
+ }
+
+ if (pkt->mask & RXE_IMMDT_MASK)
+ immdt_set_imm(pkt, ibwr->ex.imm_data);
+
+ if (pkt->mask & RXE_IETH_MASK)
+ ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey);
+
+ if (pkt->mask & RXE_ATMETH_MASK) {
+ atmeth_set_va(pkt, wqe->iova);
+ if (opcode == IB_OPCODE_RC_COMPARE_SWAP ||
+ opcode == IB_OPCODE_RD_COMPARE_SWAP) {
+ atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap);
+ atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add);
+ } else {
+ atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add);
+ }
+ atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey);
+ }
+
+ if (pkt->mask & RXE_DETH_MASK) {
+ if (qp->ibqp.qp_num == 1)
+ deth_set_qkey(pkt, GSI_QKEY);
+ else
+ deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey);
+ deth_set_sqp(pkt, qp->ibqp.qp_num);
+ }
+
+ return skb;
+}
+
+static int fill_packet(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
+ struct rxe_pkt_info *pkt, struct sk_buff *skb,
+ int paylen)
+{
+ struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
+ u32 crc = 0;
+ u32 *p;
+ int err;
+
+ err = rxe->ifc_ops->prepare(rxe, pkt, skb, &crc);
+ if (err)
+ return err;
+
+ if (pkt->mask & RXE_WRITE_OR_SEND) {
+ if (wqe->wr.send_flags & IB_SEND_INLINE) {
+ u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset];
+
+ crc = crc32_le(crc, tmp, paylen);
+
+ memcpy(payload_addr(pkt), tmp, paylen);
+
+ wqe->dma.resid -= paylen;
+ wqe->dma.sge_offset += paylen;
+ } else {
+ err = copy_data(rxe, qp->pd, 0, &wqe->dma,
+ payload_addr(pkt), paylen,
+ from_mem_obj,
+ &crc);
+ if (err)
+ return err;
+ }
+ }
+ p = payload_addr(pkt) + paylen + bth_pad(pkt);
+
+ *p = ~crc;
+
+ return 0;
+}
+
+static void update_state(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
+ struct rxe_pkt_info *pkt, int payload)
+{
+ /* number of packets left to send including current one */
+ int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu;
+
+ /* handle zero length packet case */
+ if (num_pkt == 0)
+ num_pkt = 1;
+
+ if (pkt->mask & RXE_START_MASK) {
+ wqe->first_psn = qp->req.psn;
+ wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK;
+ }
+
+ if (pkt->mask & RXE_READ_MASK)
+ qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK;
+ else
+ qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
+
+ qp->req.opcode = pkt->opcode;
+
+ if (pkt->mask & RXE_END_MASK) {
+ if (qp_type(qp) == IB_QPT_RC)
+ wqe->state = wqe_state_pending;
+
+ qp->req.wqe_index = next_index(qp->sq.queue,
+ qp->req.wqe_index);
+ } else {
+ wqe->state = wqe_state_processing;
+ }
+
+ qp->need_req_skb = 0;
+
+ if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer))
+ mod_timer(&qp->retrans_timer,
+ jiffies + qp->qp_timeout_jiffies);
+}
+
+int rxe_requester(void *arg)
+{
+ struct rxe_qp *qp = (struct rxe_qp *)arg;
+ struct rxe_pkt_info pkt;
+ struct sk_buff *skb;
+ struct rxe_send_wqe *wqe;
+ unsigned mask;
+ int payload;
+ int mtu;
+ int opcode;
+ int ret;
+
+next_wqe:
+ if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR))
+ goto exit;
+
+ if (unlikely(qp->req.state == QP_STATE_RESET)) {
+ qp->req.wqe_index = consumer_index(qp->sq.queue);
+ qp->req.opcode = -1;
+ qp->req.need_rd_atomic = 0;
+ qp->req.wait_psn = 0;
+ qp->req.need_retry = 0;
+ goto exit;
+ }
+
+ if (unlikely(qp->req.need_retry)) {
+ req_retry(qp);
+ qp->req.need_retry = 0;
+ }
+
+ wqe = req_next_wqe(qp);
+ if (unlikely(!wqe))
+ goto exit;
+
+ if (unlikely(qp_type(qp) == IB_QPT_RC &&
+ qp->req.psn > (qp->comp.psn + RXE_MAX_UNACKED_PSNS))) {
+ qp->req.wait_psn = 1;
+ goto exit;
+ }
+
+ /* Limit the number of inflight SKBs per QP */
+ if (unlikely(atomic_read(&qp->skb_out) >
+ RXE_INFLIGHT_SKBS_PER_QP_HIGH)) {
+ qp->need_req_skb = 1;
+ goto exit;
+ }
+
+ opcode = next_opcode(qp, wqe, wqe->wr.opcode);
+ if (unlikely(opcode < 0)) {
+ wqe->status = IB_WC_LOC_QP_OP_ERR;
+ goto exit;
+ }
+
+ mask = rxe_opcode[opcode].mask;
+ if (unlikely(mask & RXE_READ_OR_ATOMIC)) {
+ if (check_init_depth(qp, wqe))
+ goto exit;
+ }
+
+ mtu = get_mtu(qp, wqe);
+ payload = (mask & RXE_WRITE_OR_SEND) ? wqe->dma.resid : 0;
+ if (payload > mtu) {
+ if (qp_type(qp) == IB_QPT_UD) {
+ /* C10-93.1.1: If the total sum of all the buffer lengths specified for a
+ * UD message exceeds the MTU of the port as returned by QueryHCA, the CI
+ * shall not emit any packets for this message. Further, the CI shall not
+ * generate an error due to this condition.
+ */
+
+ /* fake a successful UD send */
+ wqe->first_psn = qp->req.psn;
+ wqe->last_psn = qp->req.psn;
+ qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
+ qp->req.opcode = IB_OPCODE_UD_SEND_ONLY;
+ qp->req.wqe_index = next_index(qp->sq.queue,
+ qp->req.wqe_index);
+ wqe->state = wqe_state_done;
+ wqe->status = IB_WC_SUCCESS;
+ goto complete;
+ }
+ payload = mtu;
+ }
+
+ skb = init_req_packet(qp, wqe, opcode, payload, &pkt);
+ if (unlikely(!skb)) {
+ pr_err("Failed allocating skb\n");
+ goto err;
+ }
+
+ if (fill_packet(qp, wqe, &pkt, skb, payload)) {
+ pr_debug("Error during fill packet\n");
+ goto err;
+ }
+
+ ret = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp, &pkt, skb);
+ if (ret) {
+ qp->need_req_skb = 1;
+ kfree_skb(skb);
+
+ if (ret == -EAGAIN) {
+ rxe_run_task(&qp->req.task, 1);
+ goto exit;
+ }
+
+ goto err;
+ }
+
+ update_state(qp, wqe, &pkt, payload);
+
+ goto next_wqe;
+
+err:
+ kfree_skb(skb);
+ wqe->status = IB_WC_LOC_PROT_ERR;
+ wqe->state = wqe_state_error;
+
+complete:
+ if (qp_type(qp) != IB_QPT_RC) {
+ while (rxe_completer(qp) == 0)
+ ;
+ }
+
+ return 0;
+
+exit:
+ return -EAGAIN;
+}
--
1.8.3.1