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mlx4: reduce OOM risk on arches with large pages 

Since mlx4 NIC are used on PowerPC with 64K pages, we need to adapt
MLX4_EN_ALLOC_PREFER_ORDER definition.

Otherwise, a fragment sitting in an out of order TCP queue can hold
0.5 Mbytes and it is a serious OOM risk.

Fixes: 51151a16a6 ("mlx4: allow order-0 memory allocations in RX path")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-02-18 10:34:18 -08:00 committed by David S. Miller
parent b9ef4ab36d
commit 3608b13ccc
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
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@ -102,7 +102,8 @@
/* Use the maximum between 16384 and a single page */
#define MLX4_EN_ALLOC_SIZE PAGE_ALIGN(16384)
#define MLX4_EN_ALLOC_PREFER_ORDER PAGE_ALLOC_COSTLY_ORDER
#define MLX4_EN_ALLOC_PREFER_ORDER min_t(int, get_order(32768), \
PAGE_ALLOC_COSTLY_ORDER)
/* Receive fragment sizes; we use at most 3 fragments (for 9600 byte MTU
* and 4K allocations) */