path: root/net/sched/cls_fw.c
diff options
authorDaniel Borkmann <daniel@iogearbox.net>2017-04-19 23:01:17 +0200
committerDavid S. Miller <davem@davemloft.net>2017-04-21 13:53:27 -0400
commitb1d9fc41aab11f9520b2e0d57ae872e2ec5d6f32 (patch)
tree703640d0fff4a6079aa57d806fa4ee7b4f4af68a /net/sched/cls_fw.c
parentnetvsc: Deal with rescinded channels correctly (diff)
bpf: add napi_id read access to __sk_buff
Add napi_id access to __sk_buff for socket filter program types, tc program types and other bpf_convert_ctx_access() users. Having access to skb->napi_id is useful for per RX queue listener siloing, f.e. in combination with SO_ATTACH_REUSEPORT_EBPF and when busy polling is used, meaning SO_REUSEPORT enabled listeners can then select the corresponding socket at SYN time already [1]. The skb is marked via skb_mark_napi_id() early in the receive path (e.g., napi_gro_receive()). Currently, sockets can only use SO_INCOMING_NAPI_ID from 6d4339028b35 ("net: Introduce SO_INCOMING_NAPI_ID") as a socket option to look up the NAPI ID associated with the queue for steering, which requires a prior sk_mark_napi_id() after the socket was looked up. Semantics for the __sk_buff napi_id access are similar, meaning if skb->napi_id is < MIN_NAPI_ID (e.g. outgoing packets using sender_cpu), then an invalid napi_id of 0 is returned to the program, otherwise a valid non-zero napi_id. [1] http://netdevconf.org/2.1/slides/apr6/dumazet-BUSY-POLLING-Netdev-2.1.pdf Suggested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/cls_fw.c')
0 files changed, 0 insertions, 0 deletions