[virtio] Use host-specified MTU when available
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
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de85336abb
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4e85b2708f
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@ -77,13 +77,8 @@ enum {
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QUEUE_NB
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};
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enum {
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/** Max number of pending rx packets */
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NUM_RX_BUF = 8,
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/** Max Ethernet frame length, including FCS and VLAN tag */
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RX_BUF_SIZE = 1522,
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};
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/** Max number of pending rx packets */
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#define NUM_RX_BUF 8
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struct virtnet_nic {
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/** Base pio register address */
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@ -160,12 +155,13 @@ static void virtnet_enqueue_iob ( struct net_device *netdev,
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*/
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static void virtnet_refill_rx_virtqueue ( struct net_device *netdev ) {
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struct virtnet_nic *virtnet = netdev->priv;
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size_t len = ( netdev->max_pkt_len + 4 /* VLAN */ );
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while ( virtnet->rx_num_iobufs < NUM_RX_BUF ) {
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struct io_buffer *iobuf;
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/* Try to allocate a buffer, stop for now if out of memory */
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iobuf = alloc_iob ( RX_BUF_SIZE );
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iobuf = alloc_iob ( len );
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if ( ! iobuf )
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break;
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@ -173,7 +169,7 @@ static void virtnet_refill_rx_virtqueue ( struct net_device *netdev ) {
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list_add ( &iobuf->list, &virtnet->rx_iobufs );
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/* Mark packet length until we know the actual size */
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iob_put ( iobuf, RX_BUF_SIZE );
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iob_put ( iobuf, len );
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virtnet_enqueue_iob ( netdev, RX_INDEX, iobuf );
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virtnet->rx_num_iobufs++;
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@ -237,7 +233,8 @@ static int virtnet_open_legacy ( struct net_device *netdev ) {
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/* Driver is ready */
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features = vp_get_features ( ioaddr );
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vp_set_features ( ioaddr, features & ( 1 << VIRTIO_NET_F_MAC ) );
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vp_set_features ( ioaddr, features & ( ( 1 << VIRTIO_NET_F_MAC ) |
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( 1 << VIRTIO_NET_F_MTU ) ) );
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vp_set_status ( ioaddr, VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK );
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return 0;
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}
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@ -260,6 +257,7 @@ static int virtnet_open_modern ( struct net_device *netdev ) {
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}
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vpm_set_features ( &virtnet->vdev, features & (
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( 1ULL << VIRTIO_NET_F_MAC ) |
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( 1ULL << VIRTIO_NET_F_MTU ) |
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( 1ULL << VIRTIO_F_VERSION_1 ) |
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( 1ULL << VIRTIO_F_ANY_LAYOUT ) ) );
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vpm_add_status ( &virtnet->vdev, VIRTIO_CONFIG_S_FEATURES_OK );
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@ -389,7 +387,7 @@ static void virtnet_process_rx_packets ( struct net_device *netdev ) {
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virtnet->rx_num_iobufs--;
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/* Update iobuf length */
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iob_unput ( iobuf, RX_BUF_SIZE );
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iob_unput ( iobuf, iob_len ( iobuf ) );
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iob_put ( iobuf, len - sizeof ( struct virtio_net_hdr ) );
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DBGC2 ( virtnet, "VIRTIO-NET %p rx complete iobuf %p len %zd\n",
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@ -461,6 +459,7 @@ static int virtnet_probe_legacy ( struct pci_device *pci ) {
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struct net_device *netdev;
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struct virtnet_nic *virtnet;
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u32 features;
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u16 mtu;
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int rc;
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/* Allocate and hook up net device */
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@ -480,7 +479,7 @@ static int virtnet_probe_legacy ( struct pci_device *pci ) {
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adjust_pci_device ( pci );
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vp_reset ( ioaddr );
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/* Load MAC address */
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/* Load MAC address and MTU */
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features = vp_get_features ( ioaddr );
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if ( features & ( 1 << VIRTIO_NET_F_MAC ) ) {
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vp_get ( ioaddr, offsetof ( struct virtio_net_config, mac ),
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@ -488,6 +487,12 @@ static int virtnet_probe_legacy ( struct pci_device *pci ) {
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DBGC ( virtnet, "VIRTIO-NET %p mac=%s\n", virtnet,
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eth_ntoa ( netdev->hw_addr ) );
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}
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if ( features & ( 1ULL << VIRTIO_NET_F_MTU ) ) {
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vp_get ( ioaddr, offsetof ( struct virtio_net_config, mtu ),
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&mtu, sizeof ( mtu ) );
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DBGC ( virtnet, "VIRTIO-NET %p mtu=%d\n", virtnet, mtu );
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netdev->max_pkt_len = ( mtu + ETH_HLEN );
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}
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/* Register network device */
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if ( ( rc = register_netdev ( netdev ) ) != 0 )
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@ -517,6 +522,7 @@ static int virtnet_probe_modern ( struct pci_device *pci, int *found_dev ) {
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struct net_device *netdev;
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struct virtnet_nic *virtnet;
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u64 features;
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u16 mtu;
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int rc, common, isr, notify, config, device;
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common = virtio_pci_find_capability ( pci, VIRTIO_PCI_CAP_COMMON_CFG );
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@ -583,7 +589,7 @@ static int virtnet_probe_modern ( struct pci_device *pci, int *found_dev ) {
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vpm_add_status ( &virtnet->vdev, VIRTIO_CONFIG_S_ACKNOWLEDGE );
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vpm_add_status ( &virtnet->vdev, VIRTIO_CONFIG_S_DRIVER );
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/* Load MAC address */
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/* Load MAC address and MTU */
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if ( device ) {
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features = vpm_get_features ( &virtnet->vdev );
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if ( features & ( 1ULL << VIRTIO_NET_F_MAC ) ) {
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@ -593,6 +599,14 @@ static int virtnet_probe_modern ( struct pci_device *pci, int *found_dev ) {
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DBGC ( virtnet, "VIRTIO-NET %p mac=%s\n", virtnet,
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eth_ntoa ( netdev->hw_addr ) );
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}
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if ( features & ( 1ULL << VIRTIO_NET_F_MTU ) ) {
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vpm_get ( &virtnet->vdev,
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offsetof ( struct virtio_net_config, mtu ),
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&mtu, sizeof ( mtu ) );
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DBGC ( virtnet, "VIRTIO-NET %p mtu=%d\n", virtnet,
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mtu );
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netdev->max_pkt_len = ( mtu + ETH_HLEN );
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}
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}
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/* We need a valid MAC address */
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@ -4,6 +4,7 @@
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/* The feature bitmap for virtio net */
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#define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
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#define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
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#define VIRTIO_NET_F_MTU 3 /* Initial MTU advice */
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#define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
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#define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
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#define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
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@ -25,6 +26,15 @@ struct virtio_net_config
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{
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/* The config defining mac address (if VIRTIO_NET_F_MAC) */
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u8 mac[6];
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/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
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u16 status;
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/* Maximum number of each of transmit and receive queues;
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* see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
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* Legal values are between 1 and 0x8000
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*/
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u16 max_virtqueue_pairs;
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/* Default maximum transmit unit advice */
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u16 mtu;
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} __attribute__((packed));
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/* This is the first element of the scatter-gather list. If you don't
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