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mlx4: Add XDP frame size and adjust max XDP MTU

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The mlx4 drivers size of memory backing the RX packet is stored in
frag_stride. For XDP mode this will be PAGE_SIZE (normally 4096).
For normal mode frag_stride is 2048.

Also adjust MLX4_EN_MAX_XDP_MTU to take tailroom into account.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Cc: Saeed Mahameed <saeedm@mellanox.com>
Link: https://lore.kernel.org/bpf/158945341893.97035.2688142527052329942.stgit@firesoul
This commit is contained in:
Jesper Dangaard Brouer 2020-05-14 12:50:18 +02:00 committed by Alexei Starovoitov
parent 08fc1cfd2d
commit d201ea9ebc
2 changed files with 3 additions and 1 deletions
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3
drivers/net/ethernet/mellanox/mlx4/en_netdev.c
View file

@ -51,7 +51,8 @@
#include "en_port.h"
#define MLX4_EN_MAX_XDP_MTU ((int)(PAGE_SIZE - ETH_HLEN - (2 * VLAN_HLEN) - \
XDP_PACKET_HEADROOM))
XDP_PACKET_HEADROOM - \
SKB_DATA_ALIGN(sizeof(struct skb_shared_info))))
int mlx4_en_setup_tc(struct net_device *dev, u8 up)
{

1
drivers/net/ethernet/mellanox/mlx4/en_rx.c
View file

@ -683,6 +683,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
rcu_read_lock();
xdp_prog = rcu_dereference(ring->xdp_prog);
xdp.rxq = &ring->xdp_rxq;
xdp.frame_sz = priv->frag_info[0].frag_stride;
doorbell_pending = 0;
/* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx