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authorCornelia Huck <cornelia.huck@de.ibm.com>2014-12-11 14:25:05 +0100
committerMichael S. Tsirkin <mst@redhat.com>2015-02-26 13:04:07 +0100
commit0cd09c3a6cc2230ba38c462fc410b4acce59eb6f (patch)
tree34ac356869acdd46eb089d491b3ee4b2240dac88 /hw/net/virtio-net.c
parenta590fd5ba8f01724eee169f097f65603f0c3a8f8 (diff)
virtio: feature bit manipulation helpers
Add virtio_{add,clear}_feature helper functions for manipulating a feature bits variable. This has some benefits over open coding: - add check that the bit is in a sane range - make it obvious at a glance what is going on - have a central point to change when we want to extend feature bits Convert existing code manipulating features to use the new helpers. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/net/virtio-net.c')
-rw-r--r--hw/net/virtio-net.c34
1 files changed, 17 insertions, 17 deletions
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 45da34ad61..f901952b86 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -446,23 +446,23 @@ static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
VirtIONet *n = VIRTIO_NET(vdev);
NetClientState *nc = qemu_get_queue(n->nic);
- features |= (1 << VIRTIO_NET_F_MAC);
+ virtio_add_feature(&features, VIRTIO_NET_F_MAC);
if (!peer_has_vnet_hdr(n)) {
- features &= ~(0x1 << VIRTIO_NET_F_CSUM);
- features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
- features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
- features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
+ virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
+ virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
+ virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
+ virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
- features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
- features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
- features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
- features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
+ virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
+ virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
+ virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
+ virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
}
if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
- features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
- features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
+ virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
+ virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
}
if (!get_vhost_net(nc->peer)) {
@@ -477,11 +477,11 @@ static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
/* Linux kernel 2.6.25. It understood MAC (as everyone must),
* but also these: */
- features |= (1 << VIRTIO_NET_F_MAC);
- features |= (1 << VIRTIO_NET_F_CSUM);
- features |= (1 << VIRTIO_NET_F_HOST_TSO4);
- features |= (1 << VIRTIO_NET_F_HOST_TSO6);
- features |= (1 << VIRTIO_NET_F_HOST_ECN);
+ virtio_add_feature(&features, VIRTIO_NET_F_MAC);
+ virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
+ virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
+ virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
+ virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
return features;
}
@@ -1552,7 +1552,7 @@ static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features)
{
int i, config_size = 0;
- host_features |= (1 << VIRTIO_NET_F_MAC);
+ virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
for (i = 0; feature_sizes[i].flags != 0; i++) {
if (host_features & feature_sizes[i].flags) {
config_size = MAX(feature_sizes[i].end, config_size);