Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 1ab25f86 authored by Ido Shamay's avatar Ido Shamay Committed by David S. Miller
Browse files

net/mlx4_en: Add __GFP_COLD gfp flags in alloc_pages 



Needed in order to get cache cold pages (L3 flushed) for HW scatter.

Otherwise memory may flush those entries when the packet comes from
PCI, causing back pressure resulting in BW decrease.

Signed-off-by: default avatarIdo Shamay <idos@mellanox.com>
Signed-off-by: default avatarAmir Vadai <amirv@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5f6e9800

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

+4 −3
Original line number Diff line number Diff line
@@ -156,7 +156,7 @@ static int mlx4_en_init_allocator(struct mlx4_en_priv *priv, 
		const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];



		if (mlx4_alloc_pages(priv, &ring->page_alloc[i],

				     frag_info, GFP_KERNEL))

				     frag_info, GFP_KERNEL | __GFP_COLD))

			goto out;

	}

	return 0;
@@ -268,7 +268,7 @@ static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv) 


			if (mlx4_en_prepare_rx_desc(priv, ring,

						    ring->actual_size,

						    GFP_KERNEL)) {

						    GFP_KERNEL | __GFP_COLD)) {

				if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {

					en_err(priv, "Failed to allocate enough rx buffers\n");

					return -ENOMEM;
@@ -635,7 +635,8 @@ static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv, 
	int index = ring->prod & ring->size_mask;



	while ((u32) (ring->prod - ring->cons) < ring->actual_size) {

		if (mlx4_en_prepare_rx_desc(priv, ring, index, GFP_ATOMIC))

		if (mlx4_en_prepare_rx_desc(priv, ring, index,

					    GFP_ATOMIC | __GFP_COLD))

			break;

		ring->prod++;

		index = ring->prod & ring->size_mask;