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virtio_net: add supports for extended offloads

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The virtio_net driver needs it to implement GSO over UDP tunnel
offload.

The only missing piece is mapping them to/from the extended
features.

Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Paolo Abeni 2025-07-08 17:54:57 +02:00
parent 333c515d18
commit 3b17aa1301
1 changed files with 23 additions and 2 deletions
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25
drivers/net/virtio_net.c
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@ -35,6 +35,23 @@ module_param(csum, bool, 0444);
module_param(gso, bool, 0444);
module_param(napi_tx, bool, 0644);
#define VIRTIO_OFFLOAD_MAP_MIN 46
#define VIRTIO_OFFLOAD_MAP_MAX 47
#define VIRTIO_FEATURES_MAP_MIN 65
#define VIRTIO_O2F_DELTA (VIRTIO_FEATURES_MAP_MIN - \
VIRTIO_OFFLOAD_MAP_MIN)
static bool virtio_is_mapped_offload(unsigned int obit)
{
return obit >= VIRTIO_OFFLOAD_MAP_MIN &&
obit <= VIRTIO_OFFLOAD_MAP_MAX;
}
static unsigned int virtio_offload_to_feature(unsigned int obit)
{
return virtio_is_mapped_offload(obit) ? obit + VIRTIO_O2F_DELTA : obit;
}
/* FIXME: MTU in config. */
#define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
#define GOOD_COPY_LEN 128
@ -7066,9 +7083,13 @@ static int virtnet_probe(struct virtio_device *vdev)
netif_carrier_on(dev);
}
for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
if (virtio_has_feature(vi->vdev, guest_offloads[i]))
for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) {
unsigned int fbit;
fbit = virtio_offload_to_feature(guest_offloads[i]);
if (virtio_has_feature(vi->vdev, fbit))
set_bit(guest_offloads[i], &vi->guest_offloads);
}
vi->guest_offloads_capable = vi->guest_offloads;
rtnl_unlock();