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tcp: Introduce scatter-gather IO path from socket to tap

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...similarly to what was done for UDP. Quick performance test with
32KiB buffers, host to VM:

$ iperf3 -c 192.0.2.2 -N
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  8.47 GBytes  7.27 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  8.45 GBytes  7.26 Gbits/sec                  receiver

$ iperf3 -c 2a01:598:88ba:a056:271f:473a:c0d9:abc1
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  8.43 GBytes  7.24 Gbits/sec    0             sender
[  5]   0.00-10.00  sec  8.41 GBytes  7.22 Gbits/sec                  receiver

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio
2021-07-26 14:20:36 +02:00
parent 85a820a66f
commit 39ad062100
4 changed files with 516 additions and 47 deletions
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2
tcp.h
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@@ -14,6 +14,8 @@ int tcp_tap_handler(struct ctx *c, int af, void *addr,
struct tap_msg *msg, int count, struct timespec *now);
int tcp_sock_init(struct ctx *c);
void tcp_timer(struct ctx *c, struct timespec *ts);
void tcp_update_l2_buf(unsigned char *eth_d, unsigned char *eth_s,
uint32_t *ip_da);
/**
* union tcp_epoll_ref - epoll reference portion for TCP connections