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bpf: Add rx_queue_mapping to bpf_sock

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Add "rx_queue_mapping" to bpf_sock. This gives read access for the
existing field (sk_rx_queue_mapping) of struct sock from bpf_sock.
Semantics for the bpf_sock rx_queue_mapping access are similar to
sk_rx_queue_get(), i.e the value NO_QUEUE_MAPPING is not allowed
and -1 is returned in that case. This is useful for transmit queue
selection based on the received queue index which is cached in the
socket in the receive path.

v3: Addressed review comments to add usecase in patch description,
    and fixed default value for rx_queue_mapping.
v2: fixed build error for CONFIG_XPS wrapping, reported by
    kbuild test robot <lkp@intel.com>

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Amritha Nambiar
2020-05-26 17:34:36 -07:00
committed by Alexei Starovoitov
parent e255d32739
commit c3c16f2ea6
2 changed files with 19 additions and 0 deletions
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include/uapi/linux/bpf.h
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@@ -3612,6 +3612,7 @@ struct bpf_sock {
__u32 dst_ip4;
__u32 dst_ip6[4];
__u32 state;
__s32 rx_queue_mapping;
};
struct bpf_tcp_sock {