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.

Björn Töpel committed 8 years ago

Commit fbfc5041 parent c4971768 files · +289 −2Browse files

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include/uapi/linux/bpf.h+1−0

@@ -116,6 +116,7 @@ enum bpf_map_type { · 115 unmodified lines
116	BPF_MAP_TYPE_DEVMAP,	116	BPF_MAP_TYPE_DEVMAP,
117	BPF_MAP_TYPE_SOCKMAP,	117	BPF_MAP_TYPE_SOCKMAP,
118	BPF_MAP_TYPE_CPUMAP,	118	BPF_MAP_TYPE_CPUMAP,
		119	BPF_MAP_TYPE_XSKMAP,
119	};	120	};
120		121
121	enum bpf_prog_type {	122	enum bpf_prog_type {