From 3608b13ccc51d06e499dfe12b27f134de1286e28 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sat, 18 Feb 2017 10:34:18 -0800 Subject: [PATCH] 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: 51151a16a60f ("mlx4: allow order-0 memory allocations in RX path") Signed-off-by: Eric Dumazet Reviewed-by: Tariq Toukan Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h index d8ca6d1794ef..4941b692e947 100644 --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h @@ -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) */ -- 2.45.2