[ofa-general] [PATCH 1/3] IB/ipath - fix the length returned in loopback UD completion queue entries

[Ralph Campbell]

UD packets sent to the local IB port (loopback) have a zero length
reported in the send work request completion entry. This fixes it
by using a copy of the WQE to copy the data.

Signed-off-by: Ralph Campbell <ralph.campbell at qlogic.com>
---

 drivers/infiniband/hw/ipath/ipath_ud.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/ipath/ipath_ud.c b/drivers/infiniband/hw/ipath/ipath_ud.c
index 729446f..136dc4c 100644
--- a/drivers/infiniband/hw/ipath/ipath_ud.c
+++ b/drivers/infiniband/hw/ipath/ipath_ud.c
@@ -54,6 +54,7 @@ static void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_swqe *swqe)
 	unsigned long flags;
 	struct ipath_rq *rq;
 	struct ipath_srq *srq;
+	struct ipath_sge_state ssge;
 	struct ipath_sge_state rsge;
 	struct ipath_sge *sge;
 	struct ipath_rwq *wq;
@@ -196,7 +197,10 @@ static void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_swqe *swqe)
 		wc.wc_flags |= IB_WC_GRH;
 	} else
 		ipath_skip_sge(&rsge, sizeof(struct ib_grh));
-	sge = swqe->sg_list;
+	ssge.sg_list = swqe->sg_list + 1;
+	ssge.sge = *swqe->sg_list;
+	ssge.num_sge = swqe->wr.num_sge;
+	sge = &ssge.sge;
 	while (length) {
 		u32 len = sge->length;
 
@@ -210,8 +214,8 @@ static void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_swqe *swqe)
 		sge->length -= len;
 		sge->sge_length -= len;
 		if (sge->sge_length == 0) {
-			if (--swqe->wr.num_sge)
-				sge++;
+			if (--ssge.num_sge)
+				*sge = *ssge.sg_list++;
 		} else if (sge->length == 0 && sge->mr != NULL) {
 			if (++sge->n >= IPATH_SEGSZ) {
 				if (++sge->m >= sge->mr->mapsz)