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mlx4: Add XDP frame size and adjust max XDP MTU
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
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@ -51,7 +51,8 @@
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#include "en_port.h"
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#define MLX4_EN_MAX_XDP_MTU ((int)(PAGE_SIZE - ETH_HLEN - (2 * VLAN_HLEN) - \
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XDP_PACKET_HEADROOM))
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XDP_PACKET_HEADROOM - \
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SKB_DATA_ALIGN(sizeof(struct skb_shared_info))))
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int mlx4_en_setup_tc(struct net_device *dev, u8 up)
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{
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@ -683,6 +683,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
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rcu_read_lock();
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xdp_prog = rcu_dereference(ring->xdp_prog);
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xdp.rxq = &ring->xdp_rxq;
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xdp.frame_sz = priv->frag_info[0].frag_stride;
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doorbell_pending = 0;
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/* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
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