gwj / at91sam9263 · Commits

Commit b535b7b2f73803146fcd442c7df8f90d48b1967f

Authored by aliguori
1 parent fbe78f4f

Add support for tap vectored send 

This is adapted from kvm-userspace.  It allows readv to be used with tap when
the host supports it.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6074 c046a42c-6fe2-441c-8c8c-71466251a162
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Showing 1 changed file with 18 additions and 0 deletions
... ... @@ -620,6 +620,21 @@ typedef struct TAPState {
620 620 char down_script[1024];
621 621 } TAPState;
622 622  
  623 +#ifdef HAVE_IOVEC
  624 +static ssize_t tap_receive_iov(void *opaque, const struct iovec *iov,
  625 + int iovcnt)
  626 +{
  627 + TAPState *s = opaque;
  628 + ssize_t len;
  629 +
  630 + do {
  631 + len = writev(s->fd, iov, iovcnt);
  632 + } while (len == -1 && (errno == EINTR || errno == EAGAIN));
  633 +
  634 + return len;
  635 +}
  636 +#endif
  637 +
623 638 static void tap_receive(void *opaque, const uint8_t *buf, int size)
624 639 {
625 640 TAPState *s = opaque;
... ... @@ -664,6 +679,9 @@ static TAPState *net_tap_fd_init(VLANState *vlan, int fd)
664 679 return NULL;
665 680 s->fd = fd;
666 681 s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s);
  682 +#ifdef HAVE_IOVEC
  683 + s->vc->fd_readv = tap_receive_iov;
  684 +#endif
667 685 qemu_set_fd_handler(s->fd, tap_send, NULL, s);
668 686 snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", fd);
669 687 return s;
... ...