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net: move tap_set_sndbuf() to tap-linux.c

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TUNSETSNDBUF is only available on linux

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Mark McLoughlin 2009-10-22 17:49:13 +01:00 • committed by Anthony Liguori
parent c28b1c1007
commit 15ac913bfe
6 changed files with 42 additions and 24 deletions
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23
net/tap-linux.c
View file

@ -76,3 +76,26 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
fcntl(fd, F_SETFL, O_NONBLOCK);
return fd;
}
/* sndbuf should be set to a value lower than the tx queue
* capacity of any destination network interface.
* Ethernet NICs generally have txqueuelen=1000, so 1Mb is
* a good default, given a 1500 byte MTU.
*/
#define TAP_DEFAULT_SNDBUF 1024*1024
int tap_set_sndbuf(int fd, QemuOpts *opts)
{
int sndbuf;
sndbuf = qemu_opt_get_size(opts, "sndbuf", TAP_DEFAULT_SNDBUF);
if (!sndbuf) {
sndbuf = INT_MAX;
}
if (ioctl(fd, TUNSETSNDBUF, &sndbuf) == -1 && qemu_opt_get(opts, "sndbuf")) {
qemu_error("TUNSETSNDBUF ioctl failed: %s\n", strerror(errno));
return -1;
}
return 0;
}