mlx4: Add XDP frame size and adjust max XDP MTU (d201ea9e) · Commits · 戴 / test

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

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

+2 −1

Original line number	Diff line number	Diff line
		@@ -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)
		{

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

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

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