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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

15
passt.c
View file

@ -60,6 +60,9 @@
#define TAP_BUF_FILL (TAP_BUF_BYTES - ETH_MAX_MTU - sizeof(uint32_t))
#define TAP_MSGS (TAP_BUF_BYTES / sizeof(struct ethhdr) + 1)
#define PKT_BUF_BYTES MAX(TAP_BUF_BYTES, SOCK_BUF_BYTES)
static char pkt_buf [PKT_BUF_BYTES];
#define TIMER_INTERVAL MIN(TCP_TIMER_INTERVAL, UDP_TIMER_INTERVAL)
/**
@ -530,8 +533,6 @@ static int tap6_handler(struct ctx *c, struct tap_msg *msg, size_t count,
return 1;
}
static char tap_buf[TAP_BUF_BYTES];
/**
* tap_handler() - Packet handler for tap file descriptor
* @c: Execution context
@ -544,7 +545,7 @@ static int tap_handler(struct ctx *c, struct timespec *now)
struct tap_msg msg[TAP_MSGS];
int msg_count, same, i;
struct ethhdr *eh;
char *p = tap_buf;
char *p = pkt_buf;
ssize_t n, rem;
while ((n = recv(c->fd_unix, p, TAP_BUF_FILL, MSG_DONTWAIT)) > 0) {
@ -615,7 +616,7 @@ static int tap_handler(struct ctx *c, struct timespec *now)
}
}
p = tap_buf;
p = pkt_buf;
}
if (n >= 0 || errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
@ -660,11 +661,11 @@ static void sock_handler(struct ctx *c, int s, uint32_t events,
debug("%s: packet from socket %i", getprotobynumber(proto)->p_name, s);
if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6)
icmp_sock_handler(c, s, events, now);
icmp_sock_handler(c, s, events, pkt_buf, now);
else if (proto == IPPROTO_TCP)
tcp_sock_handler(c, s, events, now);
tcp_sock_handler( c, s, events, pkt_buf, now);
else if (proto == IPPROTO_UDP)
udp_sock_handler(c, s, events, now);
udp_sock_handler( c, s, events, pkt_buf, now);
}
/**