[net-next,v3,2/2] net/mlx5e: use indirect calls wrapper for the rx packet handler
diff mbox series

Message ID 93f577ed4761c9934acfe073334cbafbd6a6351f.1560333783.git.pabeni@redhat.com
State Accepted
Delegated to: David Miller
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Series
  • net/mlx5: use indirect call wrappers
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Commit Message

Paolo Abeni June 12, 2019, 10:18 a.m. UTC
We can avoid another indirect call per packet wrapping the rx
handler call with the proper helper.

To ensure that even the last listed direct call experience
measurable gain, despite the additional conditionals we must
traverse before reaching it, I tested reversing the order of the
listed options, with performance differences below noise level.

Together with the previous indirect call patch, this gives
~6% performance improvement in raw UDP tput.

v2 -> v3:
 - use only the direct calls always available regardless of
   the mlx5 build options
 - drop the direct call list macro, to keep the code as simple
   as possible for future rework

v1 -> v2:
 - update the direct call list and use a macro to define it,
   as per Saeed suggestion. An intermediated additional
   macro is needed to allow arg list expansion

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Comments

Saeed Mahameed June 14, 2019, 6:42 p.m. UTC | #1
On Wed, 2019-06-12 at 12:18 +0200, Paolo Abeni wrote:
> We can avoid another indirect call per packet wrapping the rx
> handler call with the proper helper.
> 
> To ensure that even the last listed direct call experience
> measurable gain, despite the additional conditionals we must
> traverse before reaching it, I tested reversing the order of the
> listed options, with performance differences below noise level.
> 
> Together with the previous indirect call patch, this gives
> ~6% performance improvement in raw UDP tput.
> 
> v2 -> v3:
>  - use only the direct calls always available regardless of
>    the mlx5 build options
>  - drop the direct call list macro, to keep the code as simple
>    as possible for future rework
> 
> v1 -> v2:
>  - update the direct call list and use a macro to define it,
>    as per Saeed suggestion. An intermediated additional
>    macro is needed to allow arg list expansion
> 
> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
> 

Acked-by: Saeed Mahameed <saeedm@mellanox.com>

Patch
diff mbox series

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 0fe5f13d07cc..935bf62eddc1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -1333,7 +1333,8 @@  int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
 
 		mlx5_cqwq_pop(cqwq);
 
-		rq->handle_rx_cqe(rq, cqe);
+		INDIRECT_CALL_2(rq->handle_rx_cqe, mlx5e_handle_rx_cqe_mpwrq,
+				mlx5e_handle_rx_cqe, rq, cqe);
 	} while ((++work_done < budget) && (cqe = mlx5_cqwq_get_cqe(cqwq)));
 
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