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IB/mlx5: Add support to dropless RQ

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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>
This commit is contained in:
Maor Gottlieb
2017-05-30 10:29:13 +03:00
committed by Doug Ledford
parent 246ac9814c
commit 03404e8ae6
4 changed files with 113 additions and 5 deletions
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2
include/linux/mlx5/mlx5_ifc.h
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@@ -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];