[PATCH] IB/ipath: share more common code between RC and UC protocols
authorBryan O'Sullivan <bos@pathscale.com>
Sat, 1 Jul 2006 11:35:50 +0000 (04:35 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Sat, 1 Jul 2006 16:55:58 +0000 (09:55 -0700)
Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Cc: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
drivers/infiniband/hw/ipath/ipath_qp.c
drivers/infiniband/hw/ipath/ipath_rc.c
drivers/infiniband/hw/ipath/ipath_ruc.c
drivers/infiniband/hw/ipath/ipath_uc.c
drivers/infiniband/hw/ipath/ipath_verbs.c
drivers/infiniband/hw/ipath/ipath_verbs.h

index 28fffbd4bee682f583a9ce51aea4200567cf7b92..e1d31bccf3eb38429a031249b275f5088b69fa9b 100644 (file)
@@ -709,9 +709,7 @@ struct ib_qp *ipath_create_qp(struct ib_pd *ibpd,
                spin_lock_init(&qp->r_rq.lock);
                atomic_set(&qp->refcount, 0);
                init_waitqueue_head(&qp->wait);
-               tasklet_init(&qp->s_task,
-                            init_attr->qp_type == IB_QPT_RC ?
-                            ipath_do_rc_send : ipath_do_uc_send,
+               tasklet_init(&qp->s_task, ipath_do_ruc_send,
                             (unsigned long)qp);
                INIT_LIST_HEAD(&qp->piowait);
                INIT_LIST_HEAD(&qp->timerwait);
@@ -896,9 +894,9 @@ void ipath_get_credit(struct ipath_qp *qp, u32 aeth)
         * as many packets as we like.  Otherwise, we have to
         * honor the credit field.
         */
-       if (credit == IPS_AETH_CREDIT_INVAL) {
+       if (credit == IPS_AETH_CREDIT_INVAL)
                qp->s_lsn = (u32) -1;
-       else if (qp->s_lsn != (u32) -1) {
+       else if (qp->s_lsn != (u32) -1) {
                /* Compute new LSN (i.e., MSN + credit) */
                credit = (aeth + credit_table[credit]) & IPS_MSN_MASK;
                if (ipath_cmp24(credit, qp->s_lsn) > 0)
index 33b8c78fcdcc76fa23572b64e4e4aea542df9a8e..0ca89af3e10d38bea42c809c31e08201c5558111 100644 (file)
@@ -73,9 +73,9 @@ static void ipath_init_restart(struct ipath_qp *qp, struct ipath_swqe *wqe)
  * Return bth0 if constructed; otherwise, return 0.
  * Note the QP s_lock must be held.
  */
-static inline u32 ipath_make_rc_ack(struct ipath_qp *qp,
-                                   struct ipath_other_headers *ohdr,
-                                   u32 pmtu)
+u32 ipath_make_rc_ack(struct ipath_qp *qp,
+                     struct ipath_other_headers *ohdr,
+                     u32 pmtu)
 {
        struct ipath_sge_state *ss;
        u32 hwords;
@@ -96,8 +96,7 @@ static inline u32 ipath_make_rc_ack(struct ipath_qp *qp,
                if (len > pmtu) {
                        len = pmtu;
                        qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST);
-               }
-               else
+               } else
                        qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY);
                qp->s_rdma_len -= len;
                bth0 = qp->s_ack_state << 24;
@@ -177,9 +176,9 @@ static inline u32 ipath_make_rc_ack(struct ipath_qp *qp,
  * Return 1 if constructed; otherwise, return 0.
  * Note the QP s_lock must be held.
  */
-static inline int ipath_make_rc_req(struct ipath_qp *qp,
-                                   struct ipath_other_headers *ohdr,
-                                   u32 pmtu, u32 *bth0p, u32 *bth2p)
+int ipath_make_rc_req(struct ipath_qp *qp,
+                     struct ipath_other_headers *ohdr,
+                     u32 pmtu, u32 *bth0p, u32 *bth2p)
 {
        struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
        struct ipath_sge_state *ss;
@@ -497,160 +496,33 @@ done:
        return 0;
 }
 
-static inline void ipath_make_rc_grh(struct ipath_qp *qp,
-                                    struct ib_global_route *grh,
-                                    u32 nwords)
-{
-       struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
-
-       /* GRH header size in 32-bit words. */
-       qp->s_hdrwords += 10;
-       qp->s_hdr.u.l.grh.version_tclass_flow =
-               cpu_to_be32((6 << 28) |
-                           (grh->traffic_class << 20) |
-                           grh->flow_label);
-       qp->s_hdr.u.l.grh.paylen =
-               cpu_to_be16(((qp->s_hdrwords - 12) + nwords +
-                            SIZE_OF_CRC) << 2);
-       /* next_hdr is defined by C8-7 in ch. 8.4.1 */
-       qp->s_hdr.u.l.grh.next_hdr = 0x1B;
-       qp->s_hdr.u.l.grh.hop_limit = grh->hop_limit;
-       /* The SGID is 32-bit aligned. */
-       qp->s_hdr.u.l.grh.sgid.global.subnet_prefix = dev->gid_prefix;
-       qp->s_hdr.u.l.grh.sgid.global.interface_id =
-               ipath_layer_get_guid(dev->dd);
-       qp->s_hdr.u.l.grh.dgid = grh->dgid;
-}
-
 /**
- * ipath_do_rc_send - perform a send on an RC QP
- * @data: contains a pointer to the QP
+ * send_rc_ack - Construct an ACK packet and send it
+ * @qp: a pointer to the QP
  *
- * Process entries in the send work queue until credit or queue is
- * exhausted.  Only allow one CPU to send a packet per QP (tasklet).
- * Otherwise, after we drop the QP s_lock, two threads could send
- * packets out of order.
+ * This is called from ipath_rc_rcv() and only uses the receive
+ * side QP state.
+ * Note that RDMA reads are handled in the send side QP state and tasklet.
  */
-void ipath_do_rc_send(unsigned long data)
-{
-       struct ipath_qp *qp = (struct ipath_qp *)data;
-       struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
-       unsigned long flags;
-       u16 lrh0;
-       u32 nwords;
-       u32 extra_bytes;
-       u32 bth0;
-       u32 bth2;
-       u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
-       struct ipath_other_headers *ohdr;
-
-       if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags))
-               goto bail;
-
-       if (unlikely(qp->remote_ah_attr.dlid ==
-                    ipath_layer_get_lid(dev->dd))) {
-               struct ib_wc wc;
-
-               /*
-                * Pass in an uninitialized ib_wc to be consistent with
-                * other places where ipath_ruc_loopback() is called.
-                */
-               ipath_ruc_loopback(qp, &wc);
-               goto clear;
-       }
-
-       ohdr = &qp->s_hdr.u.oth;
-       if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
-               ohdr = &qp->s_hdr.u.l.oth;
-
-again:
-       /* Check for a constructed packet to be sent. */
-       if (qp->s_hdrwords != 0) {
-               /*
-                * If no PIO bufs are available, return.  An interrupt will
-                * call ipath_ib_piobufavail() when one is available.
-                */
-               _VERBS_INFO("h %u %p\n", qp->s_hdrwords, &qp->s_hdr);
-               _VERBS_INFO("d %u %p %u %p %u %u %u %u\n", qp->s_cur_size,
-                           qp->s_cur_sge->sg_list,
-                           qp->s_cur_sge->num_sge,
-                           qp->s_cur_sge->sge.vaddr,
-                           qp->s_cur_sge->sge.sge_length,
-                           qp->s_cur_sge->sge.length,
-                           qp->s_cur_sge->sge.m,
-                           qp->s_cur_sge->sge.n);
-               if (ipath_verbs_send(dev->dd, qp->s_hdrwords,
-                                    (u32 *) &qp->s_hdr, qp->s_cur_size,
-                                    qp->s_cur_sge)) {
-                       ipath_no_bufs_available(qp, dev);
-                       goto bail;
-               }
-               dev->n_unicast_xmit++;
-               /* Record that we sent the packet and s_hdr is empty. */
-               qp->s_hdrwords = 0;
-       }
-
-       /*
-        * The lock is needed to synchronize between setting
-        * qp->s_ack_state, resend timer, and post_send().
-        */
-       spin_lock_irqsave(&qp->s_lock, flags);
-
-       /* Sending responses has higher priority over sending requests. */
-       if (qp->s_ack_state != OP(ACKNOWLEDGE) &&
-           (bth0 = ipath_make_rc_ack(qp, ohdr, pmtu)) != 0)
-               bth2 = qp->s_ack_psn++ & IPS_PSN_MASK;
-       else if (!ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2))
-               goto done;
-
-       spin_unlock_irqrestore(&qp->s_lock, flags);
-
-       /* Construct the header. */
-       extra_bytes = (4 - qp->s_cur_size) & 3;
-       nwords = (qp->s_cur_size + extra_bytes) >> 2;
-       lrh0 = IPS_LRH_BTH;
-       if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
-               ipath_make_rc_grh(qp, &qp->remote_ah_attr.grh, nwords);
-               lrh0 = IPS_LRH_GRH;
-       }
-       lrh0 |= qp->remote_ah_attr.sl << 4;
-       qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
-       qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
-       qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords +
-                                      SIZE_OF_CRC);
-       qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
-       bth0 |= ipath_layer_get_pkey(dev->dd, qp->s_pkey_index);
-       bth0 |= extra_bytes << 20;
-       ohdr->bth[0] = cpu_to_be32(bth0);
-       ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
-       ohdr->bth[2] = cpu_to_be32(bth2);
-
-       /* Check for more work to do. */
-       goto again;
-
-done:
-       spin_unlock_irqrestore(&qp->s_lock, flags);
-clear:
-       clear_bit(IPATH_S_BUSY, &qp->s_flags);
-bail:
-       return;
-}
-
 static void send_rc_ack(struct ipath_qp *qp)
 {
        struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
        u16 lrh0;
        u32 bth0;
+       u32 hwords;
+       struct ipath_ib_header hdr;
        struct ipath_other_headers *ohdr;
 
        /* Construct the header. */
-       ohdr = &qp->s_hdr.u.oth;
+       ohdr = &hdr.u.oth;
        lrh0 = IPS_LRH_BTH;
        /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */
-       qp->s_hdrwords = 6;
+       hwords = 6;
        if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
-               ipath_make_rc_grh(qp, &qp->remote_ah_attr.grh, 0);
-               ohdr = &qp->s_hdr.u.l.oth;
+               hwords += ipath_make_grh(dev, &hdr.u.l.grh,
+                                        &qp->remote_ah_attr.grh,
+                                        hwords, 0);
+               ohdr = &hdr.u.l.oth;
                lrh0 = IPS_LRH_GRH;
        }
        bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index);
@@ -658,15 +530,14 @@ static void send_rc_ack(struct ipath_qp *qp)
        if (qp->s_ack_state >= OP(COMPARE_SWAP)) {
                bth0 |= IB_OPCODE_ATOMIC_ACKNOWLEDGE << 24;
                ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->s_ack_atomic);
-               qp->s_hdrwords += sizeof(ohdr->u.at.atomic_ack_eth) / 4;
-       }
-       else
+               hwords += sizeof(ohdr->u.at.atomic_ack_eth) / 4;
+       } else
                bth0 |= OP(ACKNOWLEDGE) << 24;
        lrh0 |= qp->remote_ah_attr.sl << 4;
-       qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
-       qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
-       qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + SIZE_OF_CRC);
-       qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
+       hdr.lrh[0] = cpu_to_be16(lrh0);
+       hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
+       hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC);
+       hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
        ohdr->bth[0] = cpu_to_be32(bth0);
        ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
        ohdr->bth[2] = cpu_to_be32(qp->s_ack_psn & IPS_PSN_MASK);
@@ -674,8 +545,7 @@ static void send_rc_ack(struct ipath_qp *qp)
        /*
         * If we can send the ACK, clear the ACK state.
         */
-       if (ipath_verbs_send(dev->dd, qp->s_hdrwords, (u32 *) &qp->s_hdr,
-                            0, NULL) == 0) {
+       if (ipath_verbs_send(dev->dd, hwords, (u32 *) &hdr, 0, NULL) == 0) {
                qp->s_ack_state = OP(ACKNOWLEDGE);
                dev->n_rc_qacks++;
                dev->n_unicast_xmit++;
@@ -805,7 +675,7 @@ bail:
  * @qp: the QP
  * @psn: the packet sequence number to restart at
  *
- * This is called from ipath_rc_rcv() to process an incoming RC ACK
+ * This is called from ipath_rc_rcv_resp() to process an incoming RC ACK
  * for the given QP.
  * Called at interrupt level with the QP s_lock held.
  */
@@ -1231,18 +1101,12 @@ static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev,
                 * ICRC (4).
                 */
                if (unlikely(tlen <= (hdrsize + pad + 8))) {
-                       /*
-                        * XXX Need to generate an error CQ
-                        * entry.
-                        */
+                       /* XXX Need to generate an error CQ entry. */
                        goto ack_done;
                }
                tlen -= hdrsize + pad + 8;
                if (unlikely(tlen != qp->s_len)) {
-                       /*
-                        * XXX Need to generate an error CQ
-                        * entry.
-                        */
+                       /* XXX Need to generate an error CQ entry. */
                        goto ack_done;
                }
                if (!header_in_data)
@@ -1384,7 +1248,7 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
        case OP(COMPARE_SWAP):
        case OP(FETCH_ADD):
                /*
-                * Check for the PSN of the last atomic operations
+                * Check for the PSN of the last atomic operation
                 * performed and resend the result if found.
                 */
                if ((psn & IPS_PSN_MASK) != qp->r_atomic_psn) {
@@ -1454,11 +1318,6 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
                } else
                        psn = be32_to_cpu(ohdr->bth[2]);
        }
-       /*
-        * The opcode is in the low byte when its in network order
-        * (top byte when in host order).
-        */
-       opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
 
        /*
         * Process responses (ACKs) before anything else.  Note that the
@@ -1466,6 +1325,7 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
         * queue rather than the expected receive packet sequence number.
         * In other words, this QP is the requester.
         */
+       opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
        if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
            opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
                ipath_rc_rcv_resp(dev, ohdr, data, tlen, qp, opcode, psn,
index 2714d6470c356cdcc28bab4e0736c3a96d53f2c1..9a456a7ce352a856d016fc75ba9ccc6ebf31c62f 100644 (file)
@@ -32,6 +32,7 @@
  */
 
 #include "ipath_verbs.h"
+#include "ips_common.h"
 
 /*
  * Convert the AETH RNR timeout code into the number of milliseconds.
@@ -188,7 +189,6 @@ bail:
 /**
  * ipath_ruc_loopback - handle UC and RC lookback requests
  * @sqp: the loopback QP
- * @wc: the work completion entry
  *
  * This is called from ipath_do_uc_send() or ipath_do_rc_send() to
  * forward a WQE addressed to the same HCA.
@@ -197,13 +197,14 @@ bail:
  * receive interrupts since this is a connected protocol and all packets
  * will pass through here.
  */
-void ipath_ruc_loopback(struct ipath_qp *sqp, struct ib_wc *wc)
+static void ipath_ruc_loopback(struct ipath_qp *sqp)
 {
        struct ipath_ibdev *dev = to_idev(sqp->ibqp.device);
        struct ipath_qp *qp;
        struct ipath_swqe *wqe;
        struct ipath_sge *sge;
        unsigned long flags;
+       struct ib_wc wc;
        u64 sdata;
 
        qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn);
@@ -234,8 +235,8 @@ again:
        wqe = get_swqe_ptr(sqp, sqp->s_last);
        spin_unlock_irqrestore(&sqp->s_lock, flags);
 
-       wc->wc_flags = 0;
-       wc->imm_data = 0;
+       wc.wc_flags = 0;
+       wc.imm_data = 0;
 
        sqp->s_sge.sge = wqe->sg_list[0];
        sqp->s_sge.sg_list = wqe->sg_list + 1;
@@ -243,8 +244,8 @@ again:
        sqp->s_len = wqe->length;
        switch (wqe->wr.opcode) {
        case IB_WR_SEND_WITH_IMM:
-               wc->wc_flags = IB_WC_WITH_IMM;
-               wc->imm_data = wqe->wr.imm_data;
+               wc.wc_flags = IB_WC_WITH_IMM;
+               wc.imm_data = wqe->wr.imm_data;
                /* FALLTHROUGH */
        case IB_WR_SEND:
                spin_lock_irqsave(&qp->r_rq.lock, flags);
@@ -255,7 +256,7 @@ again:
                        if (qp->ibqp.qp_type == IB_QPT_UC)
                                goto send_comp;
                        if (sqp->s_rnr_retry == 0) {
-                               wc->status = IB_WC_RNR_RETRY_EXC_ERR;
+                               wc.status = IB_WC_RNR_RETRY_EXC_ERR;
                                goto err;
                        }
                        if (sqp->s_rnr_retry_cnt < 7)
@@ -270,8 +271,8 @@ again:
                break;
 
        case IB_WR_RDMA_WRITE_WITH_IMM:
-               wc->wc_flags = IB_WC_WITH_IMM;
-               wc->imm_data = wqe->wr.imm_data;
+               wc.wc_flags = IB_WC_WITH_IMM;
+               wc.imm_data = wqe->wr.imm_data;
                spin_lock_irqsave(&qp->r_rq.lock, flags);
                if (!ipath_get_rwqe(qp, 1))
                        goto rnr_nak;
@@ -285,20 +286,20 @@ again:
                                            wqe->wr.wr.rdma.rkey,
                                            IB_ACCESS_REMOTE_WRITE))) {
                acc_err:
-                       wc->status = IB_WC_REM_ACCESS_ERR;
+                       wc.status = IB_WC_REM_ACCESS_ERR;
                err:
-                       wc->wr_id = wqe->wr.wr_id;
-                       wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
-                       wc->vendor_err = 0;
-                       wc->byte_len = 0;
-                       wc->qp_num = sqp->ibqp.qp_num;
-                       wc->src_qp = sqp->remote_qpn;
-                       wc->pkey_index = 0;
-                       wc->slid = sqp->remote_ah_attr.dlid;
-                       wc->sl = sqp->remote_ah_attr.sl;
-                       wc->dlid_path_bits = 0;
-                       wc->port_num = 0;
-                       ipath_sqerror_qp(sqp, wc);
+                       wc.wr_id = wqe->wr.wr_id;
+                       wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
+                       wc.vendor_err = 0;
+                       wc.byte_len = 0;
+                       wc.qp_num = sqp->ibqp.qp_num;
+                       wc.src_qp = sqp->remote_qpn;
+                       wc.pkey_index = 0;
+                       wc.slid = sqp->remote_ah_attr.dlid;
+                       wc.sl = sqp->remote_ah_attr.sl;
+                       wc.dlid_path_bits = 0;
+                       wc.port_num = 0;
+                       ipath_sqerror_qp(sqp, &wc);
                        goto done;
                }
                break;
@@ -374,22 +375,22 @@ again:
                goto send_comp;
 
        if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM)
-               wc->opcode = IB_WC_RECV_RDMA_WITH_IMM;
+               wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
        else
-               wc->opcode = IB_WC_RECV;
-       wc->wr_id = qp->r_wr_id;
-       wc->status = IB_WC_SUCCESS;
-       wc->vendor_err = 0;
-       wc->byte_len = wqe->length;
-       wc->qp_num = qp->ibqp.qp_num;
-       wc->src_qp = qp->remote_qpn;
+               wc.opcode = IB_WC_RECV;
+       wc.wr_id = qp->r_wr_id;
+       wc.status = IB_WC_SUCCESS;
+       wc.vendor_err = 0;
+       wc.byte_len = wqe->length;
+       wc.qp_num = qp->ibqp.qp_num;
+       wc.src_qp = qp->remote_qpn;
        /* XXX do we know which pkey matched? Only needed for GSI. */
-       wc->pkey_index = 0;
-       wc->slid = qp->remote_ah_attr.dlid;
-       wc->sl = qp->remote_ah_attr.sl;
-       wc->dlid_path_bits = 0;
+       wc.pkey_index = 0;
+       wc.slid = qp->remote_ah_attr.dlid;
+       wc.sl = qp->remote_ah_attr.sl;
+       wc.dlid_path_bits = 0;
        /* Signal completion event if the solicited bit is set. */
-       ipath_cq_enter(to_icq(qp->ibqp.recv_cq), wc,
+       ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
                       wqe->wr.send_flags & IB_SEND_SOLICITED);
 
 send_comp:
@@ -397,19 +398,19 @@ send_comp:
 
        if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &sqp->s_flags) ||
            (wqe->wr.send_flags & IB_SEND_SIGNALED)) {
-               wc->wr_id = wqe->wr.wr_id;
-               wc->status = IB_WC_SUCCESS;
-               wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
-               wc->vendor_err = 0;
-               wc->byte_len = wqe->length;
-               wc->qp_num = sqp->ibqp.qp_num;
-               wc->src_qp = 0;
-               wc->pkey_index = 0;
-               wc->slid = 0;
-               wc->sl = 0;
-               wc->dlid_path_bits = 0;
-               wc->port_num = 0;
-               ipath_cq_enter(to_icq(sqp->ibqp.send_cq), wc, 0);
+               wc.wr_id = wqe->wr.wr_id;
+               wc.status = IB_WC_SUCCESS;
+               wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
+               wc.vendor_err = 0;
+               wc.byte_len = wqe->length;
+               wc.qp_num = sqp->ibqp.qp_num;
+               wc.src_qp = 0;
+               wc.pkey_index = 0;
+               wc.slid = 0;
+               wc.sl = 0;
+               wc.dlid_path_bits = 0;
+               wc.port_num = 0;
+               ipath_cq_enter(to_icq(sqp->ibqp.send_cq), &wc, 0);
        }
 
        /* Update s_last now that we are finished with the SWQE */
@@ -455,11 +456,11 @@ void ipath_no_bufs_available(struct ipath_qp *qp, struct ipath_ibdev *dev)
 }
 
 /**
- * ipath_post_rc_send - post RC and UC sends
+ * ipath_post_ruc_send - post RC and UC sends
  * @qp: the QP to post on
  * @wr: the work request to send
  */
-int ipath_post_rc_send(struct ipath_qp *qp, struct ib_send_wr *wr)
+int ipath_post_ruc_send(struct ipath_qp *qp, struct ib_send_wr *wr)
 {
        struct ipath_swqe *wqe;
        unsigned long flags;
@@ -534,13 +535,149 @@ int ipath_post_rc_send(struct ipath_qp *qp, struct ib_send_wr *wr)
        qp->s_head = next;
        spin_unlock_irqrestore(&qp->s_lock, flags);
 
-       if (qp->ibqp.qp_type == IB_QPT_UC)
-               ipath_do_uc_send((unsigned long) qp);
-       else
-               ipath_do_rc_send((unsigned long) qp);
+       ipath_do_ruc_send((unsigned long) qp);
 
        ret = 0;
 
 bail:
        return ret;
 }
+
+/**
+ * ipath_make_grh - construct a GRH header
+ * @dev: a pointer to the ipath device
+ * @hdr: a pointer to the GRH header being constructed
+ * @grh: the global route address to send to
+ * @hwords: the number of 32 bit words of header being sent
+ * @nwords: the number of 32 bit words of data being sent
+ *
+ * Return the size of the header in 32 bit words.
+ */
+u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr,
+                  struct ib_global_route *grh, u32 hwords, u32 nwords)
+{
+       hdr->version_tclass_flow =
+               cpu_to_be32((6 << 28) |
+                           (grh->traffic_class << 20) |
+                           grh->flow_label);
+       hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
+       /* next_hdr is defined by C8-7 in ch. 8.4.1 */
+       hdr->next_hdr = 0x1B;
+       hdr->hop_limit = grh->hop_limit;
+       /* The SGID is 32-bit aligned. */
+       hdr->sgid.global.subnet_prefix = dev->gid_prefix;
+       hdr->sgid.global.interface_id = ipath_layer_get_guid(dev->dd);
+       hdr->dgid = grh->dgid;
+
+       /* GRH header size in 32-bit words. */
+       return sizeof(struct ib_grh) / sizeof(u32);
+}
+
+/**
+ * ipath_do_ruc_send - perform a send on an RC or UC QP
+ * @data: contains a pointer to the QP
+ *
+ * Process entries in the send work queue until credit or queue is
+ * exhausted.  Only allow one CPU to send a packet per QP (tasklet).
+ * Otherwise, after we drop the QP s_lock, two threads could send
+ * packets out of order.
+ */
+void ipath_do_ruc_send(unsigned long data)
+{
+       struct ipath_qp *qp = (struct ipath_qp *)data;
+       struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
+       unsigned long flags;
+       u16 lrh0;
+       u32 nwords;
+       u32 extra_bytes;
+       u32 bth0;
+       u32 bth2;
+       u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
+       struct ipath_other_headers *ohdr;
+
+       if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags))
+               goto bail;
+
+       if (unlikely(qp->remote_ah_attr.dlid ==
+                    ipath_layer_get_lid(dev->dd))) {
+               ipath_ruc_loopback(qp);
+               goto clear;
+       }
+
+       ohdr = &qp->s_hdr.u.oth;
+       if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
+               ohdr = &qp->s_hdr.u.l.oth;
+
+again:
+       /* Check for a constructed packet to be sent. */
+       if (qp->s_hdrwords != 0) {
+               /*
+                * If no PIO bufs are available, return.  An interrupt will
+                * call ipath_ib_piobufavail() when one is available.
+                */
+               if (ipath_verbs_send(dev->dd, qp->s_hdrwords,
+                                    (u32 *) &qp->s_hdr, qp->s_cur_size,
+                                    qp->s_cur_sge)) {
+                       ipath_no_bufs_available(qp, dev);
+                       goto bail;
+               }
+               dev->n_unicast_xmit++;
+               /* Record that we sent the packet and s_hdr is empty. */
+               qp->s_hdrwords = 0;
+       }
+
+       /*
+        * The lock is needed to synchronize between setting
+        * qp->s_ack_state, resend timer, and post_send().
+        */
+       spin_lock_irqsave(&qp->s_lock, flags);
+
+       /* Sending responses has higher priority over sending requests. */
+       if (qp->s_ack_state != IB_OPCODE_RC_ACKNOWLEDGE &&
+           (bth0 = ipath_make_rc_ack(qp, ohdr, pmtu)) != 0)
+               bth2 = qp->s_ack_psn++ & IPS_PSN_MASK;
+       else if (!((qp->ibqp.qp_type == IB_QPT_RC) ?
+                  ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2) :
+                  ipath_make_uc_req(qp, ohdr, pmtu, &bth0, &bth2))) {
+               /*
+                * Clear the busy bit before unlocking to avoid races with
+                * adding new work queue items and then failing to process
+                * them.
+                */
+               clear_bit(IPATH_S_BUSY, &qp->s_flags);
+               spin_unlock_irqrestore(&qp->s_lock, flags);
+               goto bail;
+       }
+
+       spin_unlock_irqrestore(&qp->s_lock, flags);
+
+       /* Construct the header. */
+       extra_bytes = (4 - qp->s_cur_size) & 3;
+       nwords = (qp->s_cur_size + extra_bytes) >> 2;
+       lrh0 = IPS_LRH_BTH;
+       if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
+               qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh,
+                                                &qp->remote_ah_attr.grh,
+                                                qp->s_hdrwords, nwords);
+               lrh0 = IPS_LRH_GRH;
+       }
+       lrh0 |= qp->remote_ah_attr.sl << 4;
+       qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
+       qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
+       qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords +
+                                      SIZE_OF_CRC);
+       qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
+       bth0 |= ipath_layer_get_pkey(dev->dd, qp->s_pkey_index);
+       bth0 |= extra_bytes << 20;
+       ohdr->bth[0] = cpu_to_be32(bth0);
+       ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
+       ohdr->bth[2] = cpu_to_be32(bth2);
+
+       /* Check for more work to do. */
+       goto again;
+
+clear:
+       clear_bit(IPATH_S_BUSY, &qp->s_flags);
+bail:
+       return;
+}
index b64d9ddc075ccd1cf376997b8b5fcbd714762e86..89b3e1a5e3e36f79901b85fb66e53135e213201e 100644 (file)
@@ -62,90 +62,40 @@ static void complete_last_send(struct ipath_qp *qp, struct ipath_swqe *wqe,
 }
 
 /**
- * ipath_do_uc_send - do a send on a UC queue
- * @data: contains a pointer to the QP to send on
+ * ipath_make_uc_req - construct a request packet (SEND, RDMA write)
+ * @qp: a pointer to the QP
+ * @ohdr: a pointer to the IB header being constructed
+ * @pmtu: the path MTU
+ * @bth0p: pointer to the BTH opcode word
+ * @bth2p: pointer to the BTH PSN word
  *
- * Process entries in the send work queue until the queue is exhausted.
- * Only allow one CPU to send a packet per QP (tasklet).
- * Otherwise, after we drop the QP lock, two threads could send
- * packets out of order.
- * This is similar to ipath_do_rc_send() below except we don't have
- * timeouts or resends.
+ * Return 1 if constructed; otherwise, return 0.
+ * Note the QP s_lock must be held and interrupts disabled.
  */
-void ipath_do_uc_send(unsigned long data)
+int ipath_make_uc_req(struct ipath_qp *qp,
+                     struct ipath_other_headers *ohdr,
+                     u32 pmtu, u32 *bth0p, u32 *bth2p)
 {
-       struct ipath_qp *qp = (struct ipath_qp *)data;
-       struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
        struct ipath_swqe *wqe;
-       unsigned long flags;
-       u16 lrh0;
        u32 hwords;
-       u32 nwords;
-       u32 extra_bytes;
        u32 bth0;
-       u32 bth2;
-       u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
        u32 len;
-       struct ipath_other_headers *ohdr;
        struct ib_wc wc;
 
-       if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags))
-               goto bail;
-
-       if (unlikely(qp->remote_ah_attr.dlid ==
-                    ipath_layer_get_lid(dev->dd))) {
-               /* Pass in an uninitialized ib_wc to save stack space. */
-               ipath_ruc_loopback(qp, &wc);
-               clear_bit(IPATH_S_BUSY, &qp->s_flags);
-               goto bail;
-       }
-
-       ohdr = &qp->s_hdr.u.oth;
-       if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
-               ohdr = &qp->s_hdr.u.l.oth;
-
-again:
-       /* Check for a constructed packet to be sent. */
-       if (qp->s_hdrwords != 0) {
-                       /*
-                        * If no PIO bufs are available, return.
-                        * An interrupt will call ipath_ib_piobufavail()
-                        * when one is available.
-                        */
-                       if (ipath_verbs_send(dev->dd, qp->s_hdrwords,
-                                            (u32 *) &qp->s_hdr,
-                                            qp->s_cur_size,
-                                            qp->s_cur_sge)) {
-                               ipath_no_bufs_available(qp, dev);
-                               goto bail;
-                       }
-                       dev->n_unicast_xmit++;
-               /* Record that we sent the packet and s_hdr is empty. */
-               qp->s_hdrwords = 0;
-       }
-
-       lrh0 = IPS_LRH_BTH;
-       /* header size in 32-bit words LRH+BTH = (8+12)/4. */
-       hwords = 5;
-
-       /*
-        * The lock is needed to synchronize between
-        * setting qp->s_ack_state and post_send().
-        */
-       spin_lock_irqsave(&qp->s_lock, flags);
-
        if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK))
                goto done;
 
-       bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index);
+       /* header size in 32-bit words LRH+BTH = (8+12)/4. */
+       hwords = 5;
+       bth0 = 0;
 
-       /* Send a request. */
+       /* Get the next send request. */
        wqe = get_swqe_ptr(qp, qp->s_last);
        switch (qp->s_state) {
        default:
                /*
-                * Signal the completion of the last send (if there is
-                * one).
+                * Signal the completion of the last send
+                * (if there is one).
                 */
                if (qp->s_last != qp->s_tail)
                        complete_last_send(qp, wqe, &wc);
@@ -258,61 +208,16 @@ again:
                }
                break;
        }
-       bth2 = qp->s_next_psn++ & IPS_PSN_MASK;
        qp->s_len -= len;
-       bth0 |= qp->s_state << 24;
-
-       spin_unlock_irqrestore(&qp->s_lock, flags);
-
-       /* Construct the header. */
-       extra_bytes = (4 - len) & 3;
-       nwords = (len + extra_bytes) >> 2;
-       if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
-               /* Header size in 32-bit words. */
-               hwords += 10;
-               lrh0 = IPS_LRH_GRH;
-               qp->s_hdr.u.l.grh.version_tclass_flow =
-                       cpu_to_be32((6 << 28) |
-                                   (qp->remote_ah_attr.grh.traffic_class
-                                    << 20) |
-                                   qp->remote_ah_attr.grh.flow_label);
-               qp->s_hdr.u.l.grh.paylen =
-                       cpu_to_be16(((hwords - 12) + nwords +
-                                    SIZE_OF_CRC) << 2);
-               /* next_hdr is defined by C8-7 in ch. 8.4.1 */
-               qp->s_hdr.u.l.grh.next_hdr = 0x1B;
-               qp->s_hdr.u.l.grh.hop_limit =
-                       qp->remote_ah_attr.grh.hop_limit;
-               /* The SGID is 32-bit aligned. */
-               qp->s_hdr.u.l.grh.sgid.global.subnet_prefix =
-                       dev->gid_prefix;
-               qp->s_hdr.u.l.grh.sgid.global.interface_id =
-                       ipath_layer_get_guid(dev->dd);
-               qp->s_hdr.u.l.grh.dgid = qp->remote_ah_attr.grh.dgid;
-       }
        qp->s_hdrwords = hwords;
        qp->s_cur_sge = &qp->s_sge;
        qp->s_cur_size = len;
-       lrh0 |= qp->remote_ah_attr.sl << 4;
-       qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
-       /* DEST LID */
-       qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
-       qp->s_hdr.lrh[2] = cpu_to_be16(hwords + nwords + SIZE_OF_CRC);
-       qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
-       bth0 |= extra_bytes << 20;
-       ohdr->bth[0] = cpu_to_be32(bth0);
-       ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
-       ohdr->bth[2] = cpu_to_be32(bth2);
-
-       /* Check for more work to do. */
-       goto again;
+       *bth0p = bth0 | (qp->s_state << 24);
+       *bth2p = qp->s_next_psn++ & IPS_PSN_MASK;
+       return 1;
 
 done:
-       spin_unlock_irqrestore(&qp->s_lock, flags);
-       clear_bit(IPATH_S_BUSY, &qp->s_flags);
-
-bail:
-       return;
+       return 0;
 }
 
 /**
@@ -536,12 +441,13 @@ void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
                if (qp->r_len != 0) {
                        u32 rkey = be32_to_cpu(reth->rkey);
                        u64 vaddr = be64_to_cpu(reth->vaddr);
+                       int ok;
 
                        /* Check rkey */
-                       if (unlikely(!ipath_rkey_ok(
-                                            dev, &qp->r_sge, qp->r_len,
-                                            vaddr, rkey,
-                                            IB_ACCESS_REMOTE_WRITE))) {
+                       ok = ipath_rkey_ok(dev, &qp->r_sge, qp->r_len,
+                                          vaddr, rkey,
+                                          IB_ACCESS_REMOTE_WRITE);
+                       if (unlikely(!ok)) {
                                dev->n_pkt_drops++;
                                goto done;
                        }
@@ -559,8 +465,7 @@ void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
                }
                if (opcode == OP(RDMA_WRITE_ONLY))
                        goto rdma_last;
-               else if (opcode ==
-                        OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
+               else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
                        goto rdma_last_imm;
                /* FALLTHROUGH */
        case OP(RDMA_WRITE_MIDDLE):
@@ -593,9 +498,9 @@ void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
                        dev->n_pkt_drops++;
                        goto done;
                }
-               if (qp->r_reuse_sge) {
+               if (qp->r_reuse_sge)
                        qp->r_reuse_sge = 0;
-               else if (!ipath_get_rwqe(qp, 1)) {
+               else if (!ipath_get_rwqe(qp, 1)) {
                        dev->n_pkt_drops++;
                        goto done;
                }
index 683db8ad28d3f8caa30e16cd24fd123769abfe55..6af5402fe447616d44a21dcb036d0e604d944920 100644 (file)
@@ -194,7 +194,7 @@ static int ipath_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
                switch (qp->ibqp.qp_type) {
                case IB_QPT_UC:
                case IB_QPT_RC:
-                       err = ipath_post_rc_send(qp, wr);
+                       err = ipath_post_ruc_send(qp, wr);
                        break;
 
                case IB_QPT_SMI:
index 2b2311abf05a396ed36fb8eceb994c98ec6eecc1..b461316ca223bbc1367576466d9f0780b22ecc97 100644 (file)
@@ -581,10 +581,6 @@ void ipath_sqerror_qp(struct ipath_qp *qp, struct ib_wc *wc);
 
 void ipath_get_credit(struct ipath_qp *qp, u32 aeth);
 
-void ipath_do_rc_send(unsigned long data);
-
-void ipath_do_uc_send(unsigned long data);
-
 void ipath_cq_enter(struct ipath_cq *cq, struct ib_wc *entry, int sig);
 
 int ipath_rkey_ok(struct ipath_ibdev *dev, struct ipath_sge_state *ss,
@@ -597,7 +593,7 @@ void ipath_copy_sge(struct ipath_sge_state *ss, void *data, u32 length);
 
 void ipath_skip_sge(struct ipath_sge_state *ss, u32 length);
 
-int ipath_post_rc_send(struct ipath_qp *qp, struct ib_send_wr *wr);
+int ipath_post_ruc_send(struct ipath_qp *qp, struct ib_send_wr *wr);
 
 void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
                  int has_grh, void *data, u32 tlen, struct ipath_qp *qp);
@@ -679,7 +675,19 @@ void ipath_insert_rnr_queue(struct ipath_qp *qp);
 
 int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only);
 
-void ipath_ruc_loopback(struct ipath_qp *sqp, struct ib_wc *wc);
+u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr,
+                  struct ib_global_route *grh, u32 hwords, u32 nwords);
+
+void ipath_do_ruc_send(unsigned long data);
+
+u32 ipath_make_rc_ack(struct ipath_qp *qp, struct ipath_other_headers *ohdr,
+                     u32 pmtu);
+
+int ipath_make_rc_req(struct ipath_qp *qp, struct ipath_other_headers *ohdr,
+                     u32 pmtu, u32 *bth0p, u32 *bth2p);
+
+int ipath_make_uc_req(struct ipath_qp *qp, struct ipath_other_headers *ohdr,
+                     u32 pmtu, u32 *bth0p, u32 *bth2p);
 
 extern const enum ib_wc_opcode ib_ipath_wc_opcode[];