@@ -241,6 +241,12 @@ static void vhost_vdpa_cleanup(NetClientState *nc)
}
}
+/** Dummy SetSteeringEBPF to support RSS for vhost-vdpa backend */
+static bool vhost_vdpa_set_steering_ebpf(NetClientState *nc, int prog_fd)
+{
+ return true;
+}
+
static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
{
assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
@@ -423,6 +429,7 @@ static NetClientInfo net_vhost_vdpa_info = {
.has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
.has_ufo = vhost_vdpa_has_ufo,
.check_peer_type = vhost_vdpa_check_peer_type,
+ .set_steering_ebpf = vhost_vdpa_set_steering_ebpf,
};
static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index,
@@ -1258,6 +1265,7 @@ static NetClientInfo net_vhost_vdpa_cvq_info = {
.has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
.has_ufo = vhost_vdpa_has_ufo,
.check_peer_type = vhost_vdpa_check_peer_type,
+ .set_steering_ebpf = vhost_vdpa_set_steering_ebpf,
};
/*
At present, to enable the VIRTIO_NET_F_RSS feature, eBPF must be loaded for the vhost backend. Given that vhost-vdpa is one of the vhost backend, we need to implement the SetSteeringEBPF method to support RSS for vhost-vdpa, even if vhost-vdpa calculates the rss hash in the hardware device instead of in the kernel by eBPF. Although this requires QEMU to be compiled with `--enable-bpf` configuration even if the vdpa device does not use eBPF to calculate the rss hash, this can avoid adding the specific conditional statements for vDPA case to enable the VIRTIO_NET_F_RSS feature, which reduces code maintainbility. Suggested-by: Eugenio Pérez <eperezma@redhat.com> Signed-off-by: Hawkins Jiawei <yin31149@gmail.com> --- v5: - no changes v4: https://lore.kernel.org/all/1c6faf4c5c3304c0bf14929143ccedb2e90dbcb2.1697904740.git.yin31149@gmail.com/ - no code changes v3: https://lore.kernel.org/all/30509e3c3b07bcadd95d5932aeb16820cb022902.1693299194.git.yin31149@gmail.com/ net/vhost-vdpa.c | 8 ++++++++ 1 file changed, 8 insertions(+)