IB/ipath: Support larger IB_QP_MAX_DEST_RD_ATOMIC and IB_QP_MAX_QP_RD_ATOMIC

This patch adds support for multiple RDMA reads and atomics to be sent
before an ACK is required to be seen by the requester.

Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 30 insertions, 28 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_ruc.c b/drivers/infiniband/hw/ipath/ipath_ruc.c
index cda84933bb43..d9c2a9b15d86 100644
--- a/drivers/infiniband/hw/ipath/ipath_ruc.c
+++ b/drivers/infiniband/hw/ipath/ipath_ruc.c
@@ -255,6 +255,7 @@ static void ipath_ruc_loopback(struct ipath_qp *sqp)
         unsigned long flags;
         struct ib_wc wc;
         u64 sdata;
+        atomic64_t *maddr;
 
         qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn);
         if (!qp) {
@@ -311,7 +312,7 @@ again:
                                 sqp->s_rnr_retry--;
                         dev->n_rnr_naks++;
                         sqp->s_rnr_timeout =
-                                ib_ipath_rnr_table[sqp->r_min_rnr_timer];
+                                ib_ipath_rnr_table[qp->r_min_rnr_timer];
                         ipath_insert_rnr_queue(sqp);
                         goto done;
                 }
@@ -344,20 +345,22 @@ again:
                         wc.sl = sqp->remote_ah_attr.sl;
                         wc.dlid_path_bits = 0;
                         wc.port_num = 0;
+                        spin_lock_irqsave(&sqp->s_lock, flags);
                         ipath_sqerror_qp(sqp, &wc);
+                        spin_unlock_irqrestore(&sqp->s_lock, flags);
                         goto done;
                 }
                 break;
 
         case IB_WR_RDMA_READ:
+                if (unlikely(!(qp->qp_access_flags &
+                               IB_ACCESS_REMOTE_READ)))
+                        goto acc_err;
                 if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length,
                                             wqe->wr.wr.rdma.remote_addr,
                                             wqe->wr.wr.rdma.rkey,
                                             IB_ACCESS_REMOTE_READ)))
                         goto acc_err;
-                if (unlikely(!(qp->qp_access_flags &
-                               IB_ACCESS_REMOTE_READ)))
-                        goto acc_err;
                 qp->r_sge.sge = wqe->sg_list[0];
                 qp->r_sge.sg_list = wqe->sg_list + 1;
                 qp->r_sge.num_sge = wqe->wr.num_sge;
@@ -365,22 +368,22 @@ again:
 
         case IB_WR_ATOMIC_CMP_AND_SWP:
         case IB_WR_ATOMIC_FETCH_AND_ADD:
+                if (unlikely(!(qp->qp_access_flags &
+                               IB_ACCESS_REMOTE_ATOMIC)))
+                        goto acc_err;
                 if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64),
-                                            wqe->wr.wr.rdma.remote_addr,
-                                            wqe->wr.wr.rdma.rkey,
+                                            wqe->wr.wr.atomic.remote_addr,
+                                            wqe->wr.wr.atomic.rkey,
                                             IB_ACCESS_REMOTE_ATOMIC)))
                         goto acc_err;
                 /* Perform atomic OP and save result. */
-                sdata = wqe->wr.wr.atomic.swap;
-                spin_lock_irqsave(&dev->pending_lock, flags);
-                qp->r_atomic_data = *(u64 *) qp->r_sge.sge.vaddr;
-                if (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
-                        *(u64 *) qp->r_sge.sge.vaddr =
-                                qp->r_atomic_data + sdata;
-                else if (qp->r_atomic_data == wqe->wr.wr.atomic.compare_add)
-                        *(u64 *) qp->r_sge.sge.vaddr = sdata;
-                spin_unlock_irqrestore(&dev->pending_lock, flags);
-                *(u64 *) sqp->s_sge.sge.vaddr = qp->r_atomic_data;
+                maddr = (atomic64_t *) qp->r_sge.sge.vaddr;
+                sdata = wqe->wr.wr.atomic.compare_add;
+                *(u64 *) sqp->s_sge.sge.vaddr =
+                        (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ?
+                        (u64) atomic64_add_return(sdata, maddr) - sdata :
+                        (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr,
+                                      sdata, wqe->wr.wr.atomic.swap);
                 goto send_comp;
 
         default:
@@ -441,7 +444,7 @@ again:
 send_comp:
         sqp->s_rnr_retry = sqp->s_rnr_retry_cnt;
 
-        if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &sqp->s_flags) ||
+        if (!(sqp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
             (wqe->wr.send_flags & IB_SEND_SIGNALED)) {
                 wc.wr_id = wqe->wr.wr_id;
                 wc.status = IB_WC_SUCCESS;
@@ -503,7 +506,7 @@ void ipath_no_bufs_available(struct ipath_qp *qp, struct ipath_ibdev *dev)
          * We clear the tasklet flag now since we are committing to return
          * from the tasklet function.
          */
-        clear_bit(IPATH_S_BUSY, &qp->s_flags);
+        clear_bit(IPATH_S_BUSY, &qp->s_busy);
         tasklet_unlock(&qp->s_task);
         want_buffer(dev->dd);
         dev->n_piowait++;
@@ -542,6 +545,9 @@ int ipath_post_ruc_send(struct ipath_qp *qp, struct ib_send_wr *wr)
                     wr->sg_list[0].addr & (sizeof(u64) - 1))) {
                 ret = -EINVAL;
                 goto bail;
+        } else if (wr->opcode >= IB_WR_RDMA_READ && !qp->s_max_rd_atomic) {
+                ret = -EINVAL;
+                goto bail;
         }
         /* IB spec says that num_sge == 0 is OK. */
         if (wr->num_sge > qp->s_max_sge) {
@@ -648,7 +654,7 @@ void ipath_do_ruc_send(unsigned long data)
         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))
+        if (test_and_set_bit(IPATH_S_BUSY, &qp->s_busy))
                 goto bail;
 
         if (unlikely(qp->remote_ah_attr.dlid == dev->dd->ipath_lid)) {
@@ -684,19 +690,15 @@ again:
          */
         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++ & IPATH_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))) {
+        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);
+                clear_bit(IPATH_S_BUSY, &qp->s_busy);
                 spin_unlock_irqrestore(&qp->s_lock, flags);
                 goto bail;
         }
@@ -729,7 +731,7 @@ again:
         goto again;
 
 clear:
-        clear_bit(IPATH_S_BUSY, &qp->s_flags);
+        clear_bit(IPATH_S_BUSY, &qp->s_busy);
 bail:
         return;
 }