When the driver sees a 0-length sge, it should transform that into a
0-length inline segment entry.
The HW will then will not add any data to the outgoing package when
it encounters that inline entry.
Reviewed-by: Jack Morgenstein <jackm@xxxxxxxxxxxx>
Signed-off-by: Noa Osherovich <noaos@xxxxxxxxxxxx>
Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxxxx>
---
src/mlx4.h | 8 ++++++++
src/qp.c | 5 ++++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/src/mlx4.h b/src/mlx4.h
index 519d8f4..f8d2051 100644
--- a/src/mlx4.h
+++ b/src/mlx4.h
@@ -92,6 +92,14 @@ enum {
MLX4_STAT_RATE_OFFSET = 5
};
+#ifndef likely
+#ifdef __GNUC__
+#define likely(x) __builtin_expect(!!(x),1)
+#else
+#define likely(x) (x)
+#endif
+#endif
+
enum {
MLX4_QP_TABLE_BITS = 8,
MLX4_QP_TABLE_SIZE = 1 << MLX4_QP_TABLE_BITS,
diff --git a/src/qp.c b/src/qp.c
index bc2d2e1..05874d2 100644
--- a/src/qp.c
+++ b/src/qp.c
@@ -170,7 +170,10 @@ static void set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ibv_sge *sg)
*/
wmb();
- dseg->byte_count = htonl(sg->length);
+ if (likely(sg->length))
+ dseg->byte_count = htonl(sg->length);
+ else
+ dseg->byte_count = htonl(0x80000000);
}
int mlx4_post_send(struct ibv_qp *ibqp, struct ibv_send_wr *wr,
--
1.8.3.1
--
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