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authorRalph Campbell <ralph.campbell@qlogic.com>2008-08-15 22:23:47 +0400
committerRoland Dreier <rolandd@cisco.com>2008-08-15 22:23:47 +0400
commit7ec01ff950c455aa1f1ccfaf347eb1aa9ec160d5 (patch)
tree3cde8a28f0c1418bc520b705c35d7c4b5de9ef10 /drivers/infiniband
parentffaa5b984a9322bbd5d9a7f0814ca2ce70feebe5 (diff)
downloadlinux-7ec01ff950c455aa1f1ccfaf347eb1aa9ec160d5.tar.xz
IB/ipath: Fix lost UD send work request
If a UD QP has some work requests queued to be sent by the DMA engine followed by a local loopback work request, we have to wait for the previous work requests to finish or the completion for the local loopback work request would be generated out of order. The problem was that the work request queue pointer was already updated so that the request would not be processed when the DMA queue drained. Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_ud.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_ud.c b/drivers/infiniband/hw/ipath/ipath_ud.c
index 36aa242c487c..729446f56aab 100644
--- a/drivers/infiniband/hw/ipath/ipath_ud.c
+++ b/drivers/infiniband/hw/ipath/ipath_ud.c
@@ -267,6 +267,7 @@ int ipath_make_ud_req(struct ipath_qp *qp)
u16 lrh0;
u16 lid;
int ret = 0;
+ int next_cur;
spin_lock_irqsave(&qp->s_lock, flags);
@@ -290,8 +291,9 @@ int ipath_make_ud_req(struct ipath_qp *qp)
goto bail;
wqe = get_swqe_ptr(qp, qp->s_cur);
- if (++qp->s_cur >= qp->s_size)
- qp->s_cur = 0;
+ next_cur = qp->s_cur + 1;
+ if (next_cur >= qp->s_size)
+ next_cur = 0;
/* Construct the header. */
ah_attr = &to_iah(wqe->wr.wr.ud.ah)->attr;
@@ -315,6 +317,7 @@ int ipath_make_ud_req(struct ipath_qp *qp)
qp->s_flags |= IPATH_S_WAIT_DMA;
goto bail;
}
+ qp->s_cur = next_cur;
spin_unlock_irqrestore(&qp->s_lock, flags);
ipath_ud_loopback(qp, wqe);
spin_lock_irqsave(&qp->s_lock, flags);
@@ -323,6 +326,7 @@ int ipath_make_ud_req(struct ipath_qp *qp)
}
}
+ qp->s_cur = next_cur;
extra_bytes = -wqe->length & 3;
nwords = (wqe->length + extra_bytes) >> 2;