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udp, passt: Introduce socket packet buffer, avoid getsockname() for UDP

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This is in preparation for scatter-gather IO on the UDP receive path:
save a getsockname() syscall by setting a flag if we get the numbering
of all bound sockets in a strict sequence (expected, in practice) and
repurpose the tap buffer to be also a socket receive buffer, passing
it down to protocol handlers.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio
2021-04-30 14:52:18 +02:00
parent 605af213c5
commit e07f539ae0
10 changed files with 103 additions and 34 deletions
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4
udp.h
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@@ -3,7 +3,7 @@
#define UDP_TIMER_INTERVAL 1000 /* ms */
void udp_sock_handler(struct ctx *c, int s, uint32_t events,
void udp_sock_handler(struct ctx *c, int s, uint32_t events, char *pkt_buf,
struct timespec *now);
int udp_tap_handler(struct ctx *c, int af, void *addr,
struct tap_msg *msg, int count, struct timespec *now);
@@ -14,11 +14,13 @@ void udp_timer(struct ctx *c, struct timespec *ts);
* struct udp_ctx - Execution context for UDP
* @fd_min: Lowest file descriptor number for UDP ever used
* @fd_max: Highest file descriptor number for UDP ever used
* @fd_in_seq: 1 if all socket numbers are in sequence, 0 otherwise
* @timer_run: Timestamp of most recent timer run
*/
struct udp_ctx {
int fd_min;
int fd_max;
int fd_in_seq;
struct timespec timer_run;
};