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passt: Introduce packet batching mechanism

Browse source 
Receive packets in batches from AF_UNIX, check if they can be sent
with a single syscall, and batch them up with sendmmsg() in case.

A bit rudimentary, currently only implemented for UDP, but it seems
to work.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-04-22 13:39:36 +02:00
parent 5b0c88d4ef
commit 1f7cf04d34
8 changed files with 337 additions and 122 deletions

14
passt.h
View file

@ -1,5 +1,19 @@
#define UNIX_SOCK_PATH "/tmp/passt.socket"
/**
* struct tap_msg - Generic message descriptor for arrays of messages
* @start: Pointer to message start
* @l4_start: Pointer to L4 header
* @len: Message length, with L2 headers
* @l4_len: Message length, with L4 headers
*/
struct tap_msg {
char *start;
char *l4h;
size_t len;
size_t l4_len;
};
#include "icmp.h"
#include "tcp.h"