e2a46d54d7
- create new netns - create veth pair (veTX+veRX) - setup AF_XDP socket for both interfaces - attach bpf to veRX - send packet via veTX - verify the packet has expected metadata at veRX Cc: John Fastabend <john.fastabend@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Martin KaFai Lau <martin.lau@linux.dev> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Willem de Bruijn <willemb@google.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Anatoly Burakov <anatoly.burakov@intel.com> Cc: Alexander Lobakin <alexandr.lobakin@intel.com> Cc: Magnus Karlsson <magnus.karlsson@gmail.com> Cc: Maryam Tahhan <mtahhan@redhat.com> Cc: xdp-hints@xdp-project.net Cc: netdev@vger.kernel.org Signed-off-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/r/20230119221536.3349901-12-sdf@google.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <vmlinux.h>
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#include "xdp_metadata.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_endian.h>
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struct {
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__uint(type, BPF_MAP_TYPE_XSKMAP);
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__uint(max_entries, 4);
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__type(key, __u32);
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__type(value, __u32);
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} xsk SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u32);
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} prog_arr SEC(".maps");
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extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
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__u64 *timestamp) __ksym;
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extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx,
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__u32 *hash) __ksym;
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SEC("xdp")
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int rx(struct xdp_md *ctx)
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{
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void *data, *data_meta;
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struct xdp_meta *meta;
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u64 timestamp = -1;
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int ret;
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/* Reserve enough for all custom metadata. */
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ret = bpf_xdp_adjust_meta(ctx, -(int)sizeof(struct xdp_meta));
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if (ret != 0)
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return XDP_DROP;
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data = (void *)(long)ctx->data;
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data_meta = (void *)(long)ctx->data_meta;
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if (data_meta + sizeof(struct xdp_meta) > data)
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return XDP_DROP;
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meta = data_meta;
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/* Export metadata. */
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/* We expect veth bpf_xdp_metadata_rx_timestamp to return 0 HW
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* timestamp, so put some non-zero value into AF_XDP frame for
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* the userspace.
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*/
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bpf_xdp_metadata_rx_timestamp(ctx, ×tamp);
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if (timestamp == 0)
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meta->rx_timestamp = 1;
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bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash);
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return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
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}
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char _license[] SEC("license") = "GPL";
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