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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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1
include/uapi/linux/bpf.h
View File

@ -3612,6 +3612,7 @@ struct bpf_sock {
__u32 dst_ip4;
__u32 dst_ip6[4];
__u32 state;
__s32 rx_queue_mapping;
};
struct bpf_tcp_sock {

18
net/core/filter.c
View File

@ -6849,6 +6849,7 @@ bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
case offsetof(struct bpf_sock, protocol):
case offsetof(struct bpf_sock, dst_port):
case offsetof(struct bpf_sock, src_port):
case offsetof(struct bpf_sock, rx_queue_mapping):
case bpf_ctx_range(struct bpf_sock, src_ip4):
case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
case bpf_ctx_range(struct bpf_sock, dst_ip4):
@ -7897,6 +7898,23 @@ u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
skc_state),
target_size));
break;
case offsetof(struct bpf_sock, rx_queue_mapping):
#ifdef CONFIG_XPS
*insn++ = BPF_LDX_MEM(
BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping),
si->dst_reg, si->src_reg,
bpf_target_off(struct sock, sk_rx_queue_mapping,
sizeof_field(struct sock,
sk_rx_queue_mapping),
target_size));
*insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING,
1);
*insn++ = BPF_MOV64_IMM(si->dst_reg, -1);
#else
*insn++ = BPF_MOV64_IMM(si->dst_reg, -1);
*target_size = 2;
#endif
break;
}
return insn - insn_buf;