net/mlx5e: Keep single pre-initialized UMR WQE per RQ

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All UMR WQEs of an RQ share many common fields. We use
pre-initialized structures to save calculations in datapath.
One field (xlt_offset) was the only reason we saved a pre-initialized
copy per WQE index.
Here we remove its initialization (move its calculation to datapath),
and reduce the number of copies to one-per-RQ.

A very small datapath calculation is added, it occurs once per a MPWQE
(i.e. once every 256KB), but reduces memory consumption and gives
better cache utilization.

Performance testing:
Tested packet rate, no degradation sensed.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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Tariq Toukan 2017-12-20 11:56:35 +02:00 • committed by Saeed Mahameed

parent 9f9e9cd50e

commit b8a98a4cf3

3 changed files with 13 additions and 19 deletions

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8

drivers/net/ethernet/mellanox/mlx5/core/en.h

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20

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

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4

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

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