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author | Björn Töpel <bjorn.topel@intel.com> | 2018-05-02 13:01:28 +0200 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2018-05-03 15:55:24 -0700 |
commit | fbfc504a24f53f7ebe128ab55cb5dba634f4ece8 (patch) | |
tree | d88b2d04cf60d5b77a5d794a3e0b006738c47e77 /include/linux/bpf.h | |
parent | c497176cb2e478f0a5713b0e05f242276e3194b5 (diff) | |
download | linux-stable-fbfc504a24f53f7ebe128ab55cb5dba634f4ece8.tar.gz linux-stable-fbfc504a24f53f7ebe128ab55cb5dba634f4ece8.tar.bz2 linux-stable-fbfc504a24f53f7ebe128ab55cb5dba634f4ece8.zip |
bpf: introduce new bpf AF_XDP map type BPF_MAP_TYPE_XSKMAP
The xskmap is yet another BPF map, very much inspired by
dev/cpu/sockmap, and is a holder of AF_XDP sockets. A user application
adds AF_XDP sockets into the map, and by using the bpf_redirect_map
helper, an XDP program can redirect XDP frames to an AF_XDP socket.
Note that a socket that is bound to certain ifindex/queue index will
*only* accept XDP frames from that netdev/queue index. If an XDP
program tries to redirect from a netdev/queue index other than what
the socket is bound to, the frame will not be received on the socket.
A socket can reside in multiple maps.
v3: Fixed race and simplified code.
v2: Removed one indirection in map lookup.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/bpf.h')
-rw-r--r-- | include/linux/bpf.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index c553f6f9c6b0..68ecdb4eea09 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -676,6 +676,31 @@ static inline int sock_map_prog(struct bpf_map *map, } #endif +#if defined(CONFIG_XDP_SOCKETS) +struct xdp_sock; +struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key); +int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, + struct xdp_sock *xs); +void __xsk_map_flush(struct bpf_map *map); +#else +struct xdp_sock; +static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, + u32 key) +{ + return NULL; +} + +static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, + struct xdp_sock *xs) +{ + return -EOPNOTSUPP; +} + +static inline void __xsk_map_flush(struct bpf_map *map) +{ +} +#endif + /* verifier prototypes for helper functions called from eBPF programs */ extern const struct bpf_func_proto bpf_map_lookup_elem_proto; extern const struct bpf_func_proto bpf_map_update_elem_proto; |