diff options
| -rw-r--r-- | net/vhost-vdpa.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index e192217a96..126afbc7a5 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -666,6 +666,58 @@ static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n) } } + /* + * According to VirtIO standard, "The device MUST have an + * empty MAC filtering table on reset.". + * + * Therefore, there is no need to send this CVQ command if the + * driver also sets an empty MAC filter table, which aligns with + * the device's defaults. + * + * Note that the device's defaults can mismatch the driver's + * configuration only at live migration. + */ + if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_RX) || + n->mac_table.in_use == 0) { + return 0; + } + + uint32_t uni_entries = n->mac_table.first_multi, + uni_macs_size = uni_entries * ETH_ALEN, + mul_entries = n->mac_table.in_use - uni_entries, + mul_macs_size = mul_entries * ETH_ALEN; + struct virtio_net_ctrl_mac uni = { + .entries = cpu_to_le32(uni_entries), + }; + struct virtio_net_ctrl_mac mul = { + .entries = cpu_to_le32(mul_entries), + }; + const struct iovec data[] = { + { + .iov_base = &uni, + .iov_len = sizeof(uni), + }, { + .iov_base = n->mac_table.macs, + .iov_len = uni_macs_size, + }, { + .iov_base = &mul, + .iov_len = sizeof(mul), + }, { + .iov_base = &n->mac_table.macs[uni_macs_size], + .iov_len = mul_macs_size, + }, + }; + ssize_t dev_written = vhost_vdpa_net_load_cmd(s, + VIRTIO_NET_CTRL_MAC, + VIRTIO_NET_CTRL_MAC_TABLE_SET, + data, ARRAY_SIZE(data)); + if (unlikely(dev_written < 0)) { + return dev_written; + } + if (*s->status != VIRTIO_NET_OK) { + return -EIO; + } + return 0; } |