net/mlx4_en: Fix pages never dma unmapped on rx

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This patch fixes a bug introduced by commit 51151a16 (mlx4: allow
order-0 memory allocations in RX path).

dma_unmap_page never reached because condition to detect last fragment
in page is wrong. offset+frag_stride can't be greater than size, need to
make sure no additional frag will fit in page => compare offset +
frag_stride + next_frag_size instead.
next_frag_size is the same as the current one, since page is shared only
with frags of the same size.

CC: Eric Dumazet <edumazet@google.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Amir Vadai 2013-10-07 13:38:13 +02:00 • committed by David S. Miller

parent 70fbe07943

commit 021f1107ff

1 changed files with 3 additions and 2 deletions

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

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