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bpf: Support for per connection SYN/SYN-ACK RTOs

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This patch adds support for setting a per connection SYN and
SYN_ACK RTOs from within a BPF_SOCK_OPS program. For example,
to set small RTOs when it is known both hosts are within a
datacenter.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lawrence Brakmo 2017-06-30 20:02:42 -07:00 committed by David S. Miller
parent ae16189efb
commit 8550f328f4
4 changed files with 17 additions and 2 deletions
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11
include/net/tcp.h
View File

@ -2057,4 +2057,15 @@ static inline int tcp_call_bpf(struct sock *sk, int op)
}
#endif
static inline u32 tcp_timeout_init(struct sock *sk)
{
int timeout;
timeout = tcp_call_bpf(sk, BPF_SOCK_OPS_TIMEOUT_INIT);
if (timeout <= 0)
timeout = TCP_TIMEOUT_INIT;
return timeout;
}
#endif /* _TCP_H */

3
include/uapi/linux/bpf.h
View File

@ -748,6 +748,9 @@ struct bpf_sock_ops {
*/
enum {
BPF_SOCK_OPS_VOID,
BPF_SOCK_OPS_TIMEOUT_INIT, /* Should return SYN-RTO value to use or
* -1 if default value should be used
*/
};
#endif /* _UAPI__LINUX_BPF_H__ */

3
net/ipv4/tcp_input.c
View File

@ -6406,7 +6406,8 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
} else {
tcp_rsk(req)->tfo_listener = false;
if (!want_cookie)
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
inet_csk_reqsk_queue_hash_add(sk, req,
tcp_timeout_init((struct sock *)req));
af_ops->send_synack(sk, dst, &fl, req, &foc,
!want_cookie ? TCP_SYNACK_NORMAL :
TCP_SYNACK_COOKIE);

2
net/ipv4/tcp_output.c
View File

@ -3326,7 +3326,7 @@ static void tcp_connect_init(struct sock *sk)
tp->rcv_wup = tp->rcv_nxt;
tp->copied_seq = tp->rcv_nxt;
inet_csk(sk)->icsk_rto = TCP_TIMEOUT_INIT;
inet_csk(sk)->icsk_rto = tcp_timeout_init(sk);
inet_csk(sk)->icsk_retransmits = 0;
tcp_clear_retrans(tp);
}