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Message-ID: <20180208183635-mutt-send-email-mst@kernel.org>
Date: Thu, 8 Feb 2018 18:39:55 +0200
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Jason Baron <jbaron@...mai.com>
Cc: davem@...emloft.net, jasowang@...hat.com, netdev@...r.kernel.org,
virtualization@...ts.linux-foundation.org, qemu-devel@...gnu.org,
virtio-dev@...ts.oasis-open.org
Subject: Re: [PATCH v4 3/3] qemu: add linkspeed and duplex settings to
virtio-net
On Fri, Jan 05, 2018 at 05:44:55PM -0500, Jason Baron wrote:
> Although linkspeed and duplex can be set in a linux guest via 'ethtool -s',
> this requires custom ethtool commands for virtio-net by default.
>
> Introduce a new feature flag, VIRTIO_NET_F_SPEED_DUPLEX, which allows
> the hypervisor to export a linkspeed and duplex setting. The user can
> subsequently overwrite it later if desired via: 'ethtool -s'.
>
> Linkspeed and duplex settings can be set as:
> '-device virtio-net,speed=10000,duplex=full'
>
> where speed is [-1...INT_MAX], and duplex is ["half"|"full"].
>
> Signed-off-by: Jason Baron <jbaron@...mai.com>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: virtio-dev@...ts.oasis-open.org
> ---
> hw/net/virtio-net.c | 32 +++++++++++++++++++++++++++++
> include/hw/virtio/virtio-net.h | 3 +++
> include/standard-headers/linux/virtio_net.h | 13 ++++++++++++
> 3 files changed, 48 insertions(+)
>
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 54823af..cd63659 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -40,6 +40,12 @@
> #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE
> #define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
>
> +/* duplex and speed */
> +#define DUPLEX_UNKNOWN 0xff
> +#define DUPLEX_HALF 0x00
> +#define DUPLEX_FULL 0x01
> +#define SPEED_UNKNOWN -1
> +
> /*
> * Calculate the number of bytes up to and including the given 'field' of
> * 'container'.
Please import ethtool.h with these macros from linux using scripts/update-linux-headers.sh
machinery.
> @@ -61,6 +67,8 @@ static VirtIOFeature feature_sizes[] = {
> .end = endof(struct virtio_net_config, max_virtqueue_pairs)},
> {.flags = 1ULL << VIRTIO_NET_F_MTU,
> .end = endof(struct virtio_net_config, mtu)},
> + {.flags = 1ULL << VIRTIO_NET_F_SPEED_DUPLEX,
> + .end = endof(struct virtio_net_config, duplex)},
> {}
> };
>
> @@ -89,6 +97,8 @@ static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
> virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues);
> virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu);
> memcpy(netcfg.mac, n->mac, ETH_ALEN);
> + virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed);
> + netcfg.duplex = n->net_conf.duplex;
> memcpy(config, &netcfg, n->config_size);
> }
>
> @@ -1941,6 +1951,26 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
> n->host_features |= (1ULL << VIRTIO_NET_F_MTU);
> }
>
> + if (n->net_conf.duplex_str) {
> + if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) {
> + n->net_conf.duplex = DUPLEX_HALF;
> + } else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) {
> + n->net_conf.duplex = DUPLEX_FULL;
> + } else {
> + error_setg(errp, "'duplex' must be 'half' or 'full'");
> + }
> + n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
> + } else {
> + n->net_conf.duplex = DUPLEX_UNKNOWN;
> + }
> +
> + if (n->net_conf.speed < SPEED_UNKNOWN) {
> + error_setg(errp, "'speed' must be between -1 (SPEED_UNKOWN) and "
> + "INT_MAX");
> + } else if (n->net_conf.speed >= 0) {
> + n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
> + }
> +
> virtio_net_set_config_size(n, n->host_features);
> virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
>
> @@ -2161,6 +2191,8 @@ static Property virtio_net_properties[] = {
> DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0),
> DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend,
> true),
> + DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
> + DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
> DEFINE_PROP_END_OF_LIST(),
> };
>
> diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
> index e7634c9..02484dc 100644
> --- a/include/hw/virtio/virtio-net.h
> +++ b/include/hw/virtio/virtio-net.h
> @@ -38,6 +38,9 @@ typedef struct virtio_net_conf
> uint16_t rx_queue_size;
> uint16_t tx_queue_size;
> uint16_t mtu;
> + int32_t speed;
> + char *duplex_str;
> + uint8_t duplex;
> } virtio_net_conf;
>
> /* Maximum packet size we can receive from tap device: header + 64k */
> diff --git a/include/standard-headers/linux/virtio_net.h b/include/standard-headers/linux/virtio_net.h
> index 30ff249..17c8531 100644
> --- a/include/standard-headers/linux/virtio_net.h
> +++ b/include/standard-headers/linux/virtio_net.h
> @@ -57,6 +57,8 @@
> * Steering */
> #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */
>
> +#define VIRTIO_NET_F_SPEED_DUPLEX 63 /* Device set linkspeed and duplex */
> +
> #ifndef VIRTIO_NET_NO_LEGACY
> #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
> #endif /* VIRTIO_NET_NO_LEGACY */
> @@ -76,6 +78,17 @@ struct virtio_net_config {
> uint16_t max_virtqueue_pairs;
> /* Default maximum transmit unit advice */
> uint16_t mtu;
> + /*
> + * speed, in units of 1Mb. All values 0 to INT_MAX are legal.
> + * Any other value stands for unknown.
> + */
> + uint32_t speed;
> + /*
> + * 0x00 - half duplex
> + * 0x01 - full duplex
> + * Any other value stands for unknown.
> + */
> + uint8_t duplex;
> } QEMU_PACKED;
>
> /*
This should be done as a separate patch by running the abovementioned
update script.
> diff --git a/pixman b/pixman
> new file mode 160000
> index 0000000..87eea99
> --- /dev/null
> +++ b/pixman
> @@ -0,0 +1 @@
> +Subproject commit 87eea99e443b389c978cf37efc52788bf03a0ee0
I don't think we need this part.
> --
> 2.6.1
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