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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

4
passt.h
View file

@ -14,6 +14,8 @@ struct tap_msg {
size_t l4_len;
};
#define SOCK_BUF_BYTES (ETH_MAX_MTU * 4)
#include "icmp.h"
#include "tcp.h"
#include "udp.h"
@ -62,5 +64,5 @@ struct ctx {
struct icmp_ctx icmp;
struct tcp_ctx tcp;
struct tcp_ctx udp;
struct udp_ctx udp;
};