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IB/mlx5: Fix iteration overrun in GSI qps 

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.

Cc: Stable <stable@vger.kernel.org>
Fixes: ea6dc20362 ('IB/mlx5: Reorder GSI completions')
Signed-off-by: Slava Shwartsman <slavash@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Haggai Eran <haggaie@mellanox.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Slava Shwartsman 2016-07-03 15:28:19 +03:00 committed by Doug Ledford
parent 619615005e
commit b0ffeb537f
1 changed files with 6 additions and 13 deletions
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19
drivers/infiniband/hw/mlx5/gsi.c
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@ -69,15 +69,6 @@ static bool mlx5_ib_deth_sqpn_cap(struct mlx5_ib_dev *dev)
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 mlx5_ib_gsi_qp *gsi)
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(struct mlx5_ib_gsi_qp *gsi,
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));