mlx4: add page recycling in receive path

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Same technique than some Intel drivers, for arches where PAGE_SIZE = 4096

In most cases, pages are reused because they were consumed
before we could loop around the RX ring.

This brings back performance, and is even better,
a single TCP flow reaches 30Gbit on my hosts.

v2: added full memset() in mlx4_en_free_frag(), as Tariq found it was needed
if we switch to large MTU, as priv->log_rx_info can dynamically be changed.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2017-03-08 08:17:13 -08:00 • committed by David S. Miller

parent b5a54d9a31

commit 34db548bfb

2 changed files with 82 additions and 177 deletions

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258

drivers/net/ethernet/mellanox/mlx4/en_rx.c

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1

drivers/net/ethernet/mellanox/mlx4/mlx4_en.h

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