IB/mlx5: Add support to dropless RQ
RQs that were configured for "delay drop" will prevent packet drops
when their WQEs are depleted.
Marking an RQ to be drop-less is done by setting delay_drop_en in RQ
context using CREATE_RQ command.
Since this feature is globally activated/deactivated by using the
SET_DELAY_DROP command on all the marked RQs, we activated/deactivated
it according to the number of RQs with 'delay_drop' enabled.
When timeout is expired, then the feature is deactivated. Therefore
the driver handles the delay drop timeout event and reactivate it.
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 4bc5764..f350688 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -2519,7 +2519,7 @@ enum {
struct mlx5_ifc_rqc_bits {
u8 rlky[0x1];
- u8 reserved_at_1[0x1];
+ u8 delay_drop_en[0x1];
u8 scatter_fcs[0x1];
u8 vsd[0x1];
u8 mem_rq_type[0x4];