bpf: finally expose xdp_rxq_info to XDP bpf-programs
Now all XDP driver have been updated to setup xdp_rxq_info and assign this to xdp_buff->rxq. Thus, it is now safe to enable access to some of the xdp_rxq_info struct members. This patch extend xdp_md and expose UAPI to userspace for ingress_ifindex and rx_queue_index. Access happens via bpf instruction rewrite, that load data directly from struct xdp_rxq_info. * ingress_ifindex map to xdp_rxq_info->dev->ifindex * rx_queue_index map to xdp_rxq_info->queue_index Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -899,6 +899,9 @@ struct xdp_md {
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__u32 data;
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__u32 data_end;
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__u32 data_meta;
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/* Below access go though struct xdp_rxq_info */
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__u32 ingress_ifindex; /* rxq->dev->ifindex */
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__u32 rx_queue_index; /* rxq->queue_index */
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};
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enum sk_action {
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@ -4304,6 +4304,25 @@ static u32 xdp_convert_ctx_access(enum bpf_access_type type,
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si->dst_reg, si->src_reg,
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offsetof(struct xdp_buff, data_end));
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break;
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case offsetof(struct xdp_md, ingress_ifindex):
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*insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
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si->dst_reg, si->src_reg,
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offsetof(struct xdp_buff, rxq));
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*insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev),
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si->dst_reg, si->dst_reg,
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offsetof(struct xdp_rxq_info, dev));
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*insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
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bpf_target_off(struct net_device,
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ifindex, 4, target_size));
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break;
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case offsetof(struct xdp_md, rx_queue_index):
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*insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
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si->dst_reg, si->src_reg,
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offsetof(struct xdp_buff, rxq));
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*insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
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bpf_target_off(struct xdp_rxq_info,
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queue_index, 4, target_size));
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break;
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}
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return insn - insn_buf;
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