[PATCH 4.7 153/186] IB/mlx5: Fix iteration overrun in GSI qps

[Greg Kroah-Hartman]

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Slava Shwartsman <slavash@xxxxxxxxxxxx>

commit b0ffeb537f3a726931d962ab6d03e34a2f070ea4 upstream.

Number of outstanding_pi may overflow and as a result may indicate that
there are no elements in the queue. The effect of doing this is that the
MAD layer will get stuck waiting for completions. The MAD layer will
think that the QP is full - because it didn't receive these completions.

This fix changes it so the outstanding_pi number is increased
with 32-bit wraparound and is not limited to max_send_wr so
that the difference between outstanding_pi and outstanding_ci will
really indicate the number of outstanding completions.

Fixes: ea6dc2036224 ('IB/mlx5: Reorder GSI completions')
Signed-off-by: Slava Shwartsman <slavash@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Reviewed-by: Haggai Eran <haggaie@xxxxxxxxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/infiniband/hw/mlx5/gsi.c |   19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

--- a/drivers/infiniband/hw/mlx5/gsi.c
+++ b/drivers/infiniband/hw/mlx5/gsi.c
@@ -69,15 +69,6 @@ static bool mlx5_ib_deth_sqpn_cap(struct
 	return MLX5_CAP_GEN(dev->mdev, set_deth_sqpn);
 }
 
-static u32 next_outstanding(struct mlx5_ib_gsi_qp *gsi, u32 index)
-{
-	return ++index % gsi->cap.max_send_wr;
-}
-
-#define for_each_outstanding_wr(gsi, index) \
-	for (index = gsi->outstanding_ci; index != gsi->outstanding_pi; \
-	     index = next_outstanding(gsi, index))
-
 /* Call with gsi->lock locked */
 static void generate_completions(struct mlx5_ib_gsi_qp *gsi)
 {
@@ -85,8 +76,9 @@ static void generate_completions(struct
 	struct mlx5_ib_gsi_wr *wr;
 	u32 index;
 
-	for_each_outstanding_wr(gsi, index) {
-		wr = &gsi->outstanding_wrs[index];
+	for (index = gsi->outstanding_ci; index != gsi->outstanding_pi;
+	     index++) {
+		wr = &gsi->outstanding_wrs[index % gsi->cap.max_send_wr];
 
 		if (!wr->completed)
 			break;
@@ -430,8 +422,9 @@ static int mlx5_ib_add_outstanding_wr(st
 		return -ENOMEM;
 	}
 
-	gsi_wr = &gsi->outstanding_wrs[gsi->outstanding_pi];
-	gsi->outstanding_pi = next_outstanding(gsi, gsi->outstanding_pi);
+	gsi_wr = &gsi->outstanding_wrs[gsi->outstanding_pi %
+				       gsi->cap.max_send_wr];
+	gsi->outstanding_pi++;
 
 	if (!wc) {
 		memset(&gsi_wr->wc, 0, sizeof(gsi_wr->wc));