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tcp, tcp_splice: Helpers for getting sockets from the pools

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We maintain pools of ready-to-connect sockets in both the original and
(for pasta) guest namespace to reduce latency when starting new TCP
connections.  If we exhaust those pools we have to take a higher
latency path to get a new socket.

Currently we open-code that fallback in the places we need it.  To improve
clarity encapsulate that into helper functions.  While we're at it, give
those helpers clearer error reporting.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-02-19 18:56:50 +11:00 • committed by Stefano Brivio
parent fbe81decbd
commit fe27ebce5c
3 changed files with 62 additions and 29 deletions

2
tcp_conn.h
View file

@ -159,7 +159,7 @@ bool tcp_flow_defer(union flow *flow);
bool tcp_splice_flow_defer(union flow *flow);
void tcp_splice_timer(const struct ctx *c, union flow *flow);
int tcp_conn_pool_sock(int pool[]);
int tcp_conn_new_sock(const struct ctx *c, sa_family_t af);
int tcp_conn_sock(const struct ctx *c, sa_family_t af);
int tcp_sock_refill_pool(const struct ctx *c, int pool[], sa_family_t af);
void tcp_splice_refill(const struct ctx *c);