[libvirt] [PATCH v2 5/7] virNetDevMacVLanTapSetup: Allow enabling of IFF_MULTI_QUEUE
Like we are doing for TUN/TAP devices, we should do the same for
macvtaps. Although, it's not as critical as in that case, we
should do it for the consistency.
Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com>
---
src/util/virnetdevmacvlan.c | 40 ++++++++++++++++++++++------------------
1 file changed, 22 insertions(+), 18 deletions(-)
diff --git a/src/util/virnetdevmacvlan.c b/src/util/virnetdevmacvlan.c
index c4d0d53..76fd542 100644
--- a/src/util/virnetdevmacvlan.c
+++ b/src/util/virnetdevmacvlan.c
@@ -289,24 +289,26 @@ virNetDevMacVLanTapOpen(const char *ifname,
* @tapfd: array of file descriptors of the macvtap tap
* @tapfdSize: number of file descriptors in @tapfd
* @vnet_hdr: whether to enable or disable IFF_VNET_HDR
+ * @multiqueue: whether to enable or disable IFF_MULTI_QUEUE
+ *
+ * Turn the IFF_VNET_HDR flag, if requested and available, make sure it's
+ * off in the other cases. Similarly, IFF_MULTI_QUEUE is enabled if
+ * requested. However, if requested and failed to set, it is considered a
+ * fatal error (as opposed to @vnet_hdr).
*
- * Turn the IFF_VNET_HDR flag, if requested and available, make sure
- * it's off in the other cases.
* A fatal error is defined as the VNET_HDR flag being set but it cannot
* be turned off for some reason. This is reported with -1. Other fatal
* error is not being able to read the interface flags. In that case the
* macvtap device should not be used.
*
- * Returns 0 on success, -1 in case of fatal error, error code otherwise.
+ * Returns 0 on success, -1 in case of fatal error.
*/
static int
-virNetDevMacVLanTapSetup(int *tapfd, size_t tapfdSize, bool vnet_hdr)
+virNetDevMacVLanTapSetup(int *tapfd, size_t tapfdSize, bool vnet_hdr, bool multiqueue)
{
unsigned int features;
struct ifreq ifreq;
short new_flags = 0;
- int rc_on_fail = 0;
- const char *errmsg = NULL;
size_t i;
for (i = 0; i < tapfdSize; i++) {
@@ -320,27 +322,29 @@ virNetDevMacVLanTapSetup(int *tapfd, size_t tapfdSize, bool
vnet_hdr)
new_flags = ifreq.ifr_flags;
- if ((ifreq.ifr_flags & IFF_VNET_HDR) && !vnet_hdr) {
- new_flags = ifreq.ifr_flags & ~IFF_VNET_HDR;
- rc_on_fail = -1;
- errmsg = _("cannot clean IFF_VNET_HDR flag on macvtap tap");
- } else if ((ifreq.ifr_flags & IFF_VNET_HDR) == 0 && vnet_hdr) {
+ if (vnet_hdr) {
if (ioctl(tapfd[i], TUNGETFEATURES, &features) < 0) {
virReportSystemError(errno, "%s",
_("cannot get feature flags on macvtap
tap"));
return -1;
}
- if ((features & IFF_VNET_HDR)) {
- new_flags = ifreq.ifr_flags | IFF_VNET_HDR;
- errmsg = _("cannot set IFF_VNET_HDR flag on macvtap tap");
- }
+ if (features & IFF_VNET_HDR)
+ new_flags |= IFF_VNET_HDR;
+ } else {
+ new_flags &= ~IFF_VNET_HDR;
}
+ if (multiqueue)
+ new_flags |= IFF_MULTI_QUEUE;
+ else
+ new_flags &= ~IFF_MULTI_QUEUE;
+
if (new_flags != ifreq.ifr_flags) {
ifreq.ifr_flags = new_flags;
if (ioctl(tapfd[i], TUNSETIFF, &ifreq) < 0) {
- virReportSystemError(errno, "%s", errmsg);
- return rc_on_fail;
+ virReportSystemError(errno, "%s",
+ _("unable to set vnet or multiqueue flags on
macvtap"));
+ return -1;
}
}
}
@@ -852,7 +856,7 @@ int virNetDevMacVLanCreateWithVPortProfile(const char *tgifname,
if (virNetDevMacVLanTapOpen(cr_ifname, &rc, 1, 10) < 0)
goto disassociate_exit;
- if (virNetDevMacVLanTapSetup(&rc, 1, vnet_hdr) < 0) {
+ if (virNetDevMacVLanTapSetup(&rc, 1, vnet_hdr, false) < 0) {
VIR_FORCE_CLOSE(rc); /* sets rc to -1 */
goto disassociate_exit;
}
--
2.4.10