thr3ads.net - Linux Virtualization - [PATCH v3 0/3] virtio_net: allow hypervisor to indicate linkspeed and duplex setting [Jan 2018]

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Jason Baron

2018-Jan-04 05:16 UTC

[PATCH v3 0/3] virtio_net: allow hypervisor to indicate linkspeed and duplex setting

We have found it useful to be able to set the linkspeed and duplex
settings from the host-side for virtio_net. This obviates the need
for guest changes and settings for these fields, and does not require
custom ethtool commands for virtio_net.

The ability to set linkspeed and duplex is useful in various cases
as described here:

16032be virtio_net: add ethtool support for set and get of settings
Using 'ethtool -s' continues to over-write the linkspeed/duplex
settings with this patch.

The 1/3 patch is against net-next, while the 2-3/3 patch are the associated
qemu changes that would go in after as update-linux-headers.sh should
be run first. So the qemu patches are a demonstration of how I intend this
to work.

Thanks,

-Jason  

linux changes:

changes from v2:
* move speed/duplex read into virtnet_config_changed_work() so link up changes
  are detected

Jason Baron (1):
  virtio_net: propagate linkspeed/duplex settings from the hypervisor

 drivers/net/virtio_net.c        | 19 ++++++++++++++++++-
 include/uapi/linux/virtio_net.h | 13 +++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

qemu changes:

changes from v2:
* if link up return configured speed/duplex, else return UNKNOWN speed and
duplex

Jason Baron (2):
  qemu: virtio-net: use 64-bit values for feature flags
  qemu: add linkspeed and duplex settings to virtio-net

 hw/net/virtio-net.c                         | 89 ++++++++++++++++++++---------
 include/hw/virtio/virtio-net.h              |  5 +-
 include/standard-headers/linux/virtio_net.h | 13 +++++
 3 files changed, 79 insertions(+), 28 deletions(-)


-- 
2.6.1

Jason Baron

2018-Jan-04 05:16 UTC

head link

[PATCH v3 2/3] qemu: virtio-net: use 64-bit values for feature flags

In prepartion for using some of the high order feature bits, make sure that
virtio-net uses 64-bit values everywhere.

Signed-off-by: Jason Baron <jbaron at akamai.com>
Cc: "Michael S. Tsirkin" <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: virtio-dev at lists.oasis-open.org
---
 hw/net/virtio-net.c            | 54 +++++++++++++++++++++---------------------
 include/hw/virtio/virtio-net.h |  2 +-
 2 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 38674b0..adc20df 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -48,18 +48,18 @@
     (offsetof(container, field) + sizeof(((container *)0)->field))
 
 typedef struct VirtIOFeature {
-    uint32_t flags;
+    uint64_t flags;
     size_t end;
 } VirtIOFeature;
 
 static VirtIOFeature feature_sizes[] = {
-    {.flags = 1 << VIRTIO_NET_F_MAC,
+    {.flags = 1ULL << VIRTIO_NET_F_MAC,
      .end = endof(struct virtio_net_config, mac)},
-    {.flags = 1 << VIRTIO_NET_F_STATUS,
+    {.flags = 1ULL << VIRTIO_NET_F_STATUS,
      .end = endof(struct virtio_net_config, status)},
-    {.flags = 1 << VIRTIO_NET_F_MQ,
+    {.flags = 1ULL << VIRTIO_NET_F_MQ,
      .end = endof(struct virtio_net_config, max_virtqueue_pairs)},
-    {.flags = 1 << VIRTIO_NET_F_MTU,
+    {.flags = 1ULL << VIRTIO_NET_F_MTU,
      .end = endof(struct virtio_net_config, mtu)},
     {}
 };
@@ -1938,7 +1938,7 @@ static void virtio_net_device_realize(DeviceState *dev,
Error **errp)
     int i;
 
     if (n->net_conf.mtu) {
-        n->host_features |= (0x1 << VIRTIO_NET_F_MTU);
+        n->host_features |= (1ULL << VIRTIO_NET_F_MTU);
     }
 
     virtio_net_set_config_size(n, n->host_features);
@@ -2109,45 +2109,45 @@ static const VMStateDescription vmstate_virtio_net = {
 };
 
 static Property virtio_net_properties[] = {
-    DEFINE_PROP_BIT("csum", VirtIONet, host_features,
VIRTIO_NET_F_CSUM, true),
-    DEFINE_PROP_BIT("guest_csum", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("csum", VirtIONet, host_features,
VIRTIO_NET_F_CSUM, true),
+    DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features,
                     VIRTIO_NET_F_GUEST_CSUM, true),
-    DEFINE_PROP_BIT("gso", VirtIONet, host_features,
VIRTIO_NET_F_GSO, true),
-    DEFINE_PROP_BIT("guest_tso4", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("gso", VirtIONet, host_features,
VIRTIO_NET_F_GSO, true),
+    DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features,
                     VIRTIO_NET_F_GUEST_TSO4, true),
-    DEFINE_PROP_BIT("guest_tso6", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features,
                     VIRTIO_NET_F_GUEST_TSO6, true),
-    DEFINE_PROP_BIT("guest_ecn", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features,
                     VIRTIO_NET_F_GUEST_ECN, true),
-    DEFINE_PROP_BIT("guest_ufo", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features,
                     VIRTIO_NET_F_GUEST_UFO, true),
-    DEFINE_PROP_BIT("guest_announce", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features,
                     VIRTIO_NET_F_GUEST_ANNOUNCE, true),
-    DEFINE_PROP_BIT("host_tso4", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features,
                     VIRTIO_NET_F_HOST_TSO4, true),
-    DEFINE_PROP_BIT("host_tso6", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features,
                     VIRTIO_NET_F_HOST_TSO6, true),
-    DEFINE_PROP_BIT("host_ecn", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features,
                     VIRTIO_NET_F_HOST_ECN, true),
-    DEFINE_PROP_BIT("host_ufo", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features,
                     VIRTIO_NET_F_HOST_UFO, true),
-    DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features,
                     VIRTIO_NET_F_MRG_RXBUF, true),
-    DEFINE_PROP_BIT("status", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("status", VirtIONet, host_features,
                     VIRTIO_NET_F_STATUS, true),
-    DEFINE_PROP_BIT("ctrl_vq", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features,
                     VIRTIO_NET_F_CTRL_VQ, true),
-    DEFINE_PROP_BIT("ctrl_rx", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features,
                     VIRTIO_NET_F_CTRL_RX, true),
-    DEFINE_PROP_BIT("ctrl_vlan", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features,
                     VIRTIO_NET_F_CTRL_VLAN, true),
-    DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features,
                     VIRTIO_NET_F_CTRL_RX_EXTRA, true),
-    DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features,
                     VIRTIO_NET_F_CTRL_MAC_ADDR, true),
-    DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet, host_features,
+    DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet,
host_features,
                     VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
-    DEFINE_PROP_BIT("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ,
false),
+    DEFINE_PROP_BIT64("mq", VirtIONet, host_features,
VIRTIO_NET_F_MQ, false),
     DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
     DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
                        TX_TIMER_INTERVAL),
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index b81b6a4..e7634c9 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -67,7 +67,7 @@ typedef struct VirtIONet {
     uint32_t has_vnet_hdr;
     size_t host_hdr_len;
     size_t guest_hdr_len;
-    uint32_t host_features;
+    uint64_t host_features;
     uint8_t has_ufo;
     uint32_t mergeable_rx_bufs;
     uint8_t promisc;
-- 
2.6.1

Jason Baron

2018-Jan-04 05:16 UTC

head link

[PATCH net-next v3 1/3] virtio_net: propagate linkspeed/duplex settings from the hypervisor

The ability to set speed and duplex for virtio_net is useful in various
scenarios as described here:

16032be virtio_net: add ethtool support for set and get of settings

However, it would be nice to be able to set this from the hypervisor,
such that virtio_net doesn't require custom guest ethtool commands.

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'.

Note that VIRTIO_NET_F_SPEED_DUPLEX is defined as bit 63, the intention
is that device feature bits are to grow down from bit 63, since the
transports are starting from bit 24 and growing up.

Signed-off-by: Jason Baron <jbaron at akamai.com>
Cc: "Michael S. Tsirkin" <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: virtio-dev at lists.oasis-open.org
---
 drivers/net/virtio_net.c        | 19 ++++++++++++++++++-
 include/uapi/linux/virtio_net.h | 13 +++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 6fb7b65..0b2d314 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2146,6 +2146,22 @@ static void virtnet_config_changed_work(struct
work_struct *work)
 
 	vi->status = v;
 
+	if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) {
+		u32 speed;
+		u8 duplex;
+
+		speed = virtio_cread32(vi->vdev,
+				       offsetof(struct virtio_net_config,
+						speed));
+		if (ethtool_validate_speed(speed))
+			vi->speed = speed;
+		duplex = virtio_cread8(vi->vdev,
+				       offsetof(struct virtio_net_config,
+						duplex));
+		if (ethtool_validate_duplex(duplex))
+			vi->duplex = duplex;
+	}
+
 	if (vi->status & VIRTIO_NET_S_LINK_UP) {
 		netif_carrier_on(vi->dev);
 		netif_tx_wake_all_queues(vi->dev);
@@ -2796,7 +2812,8 @@ static struct virtio_device_id id_table[] = {
 	VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
 	VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
 	VIRTIO_NET_F_CTRL_MAC_ADDR, \
-	VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
+	VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
+	VIRTIO_NET_F_SPEED_DUPLEX
 
 static unsigned int features[] = {
 	VIRTNET_FEATURES,
diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
index fc353b5..5de6ed3 100644
--- a/include/uapi/linux/virtio_net.h
+++ b/include/uapi/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 {
 	__u16 max_virtqueue_pairs;
 	/* Default maximum transmit unit advice */
 	__u16 mtu;
+	/*
+	 * speed, in units of 1Mb. All values 0 to INT_MAX are legal.
+	 * Any other value stands for unknown.
+	 */
+	__u32 speed;
+	/*
+	 * 0x00 - half duplex
+	 * 0x01 - full duplex
+	 * Any other value stands for unknown.
+	 */
+	__u8 duplex;
 } __attribute__((packed));
 
 /*
-- 
2.6.1

Jason Baron

2018-Jan-04 05:16 UTC

head link

[PATCH v3 3/3] qemu: add linkspeed and duplex settings to virtio-net

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 at akamai.com>
Cc: "Michael S. Tsirkin" <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: virtio-dev at lists.oasis-open.org
---
 hw/net/virtio-net.c                         | 35 +++++++++++++++++++++++++++++
 include/hw/virtio/virtio-net.h              |  3 +++
 include/standard-headers/linux/virtio_net.h | 13 +++++++++++
 3 files changed, 51 insertions(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index adc20df..eec8422 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'.
@@ -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 +97,14 @@ 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);
+    if (n->status & VIRTIO_NET_S_LINK_UP) {
+        virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed);
+        netcfg.duplex = n->net_conf.duplex;
+    } else {
+        virtio_stl_p(vdev, &netcfg.speed, SPEED_UNKNOWN);
+        netcfg.duplex = DUPLEX_UNKNOWN;
+    }
+
     memcpy(config, &netcfg, n->config_size);
 }
 
@@ -1941,6 +1957,23 @@ static void virtio_net_device_realize(DeviceState *dev,
Error **errp)
         n->host_features |= (1ULL << VIRTIO_NET_F_MTU);
     }
 
+    n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
+    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'");
+        }
+    } 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");
+    }
+
     virtio_net_set_config_size(n, n->host_features);
     virtio_init(vdev, "virtio-net", VIRTIO_ID_NET,
n->config_size);
 
@@ -2160,6 +2193,8 @@ 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;
 
 /*

Michael S. Tsirkin

2018-Jan-04 16:27 UTC

head link

[PATCH net-next v3 1/3] virtio_net: propagate linkspeed/duplex settings from the hypervisor

On Thu, Jan 04, 2018 at 12:16:44AM -0500, Jason Baron
wrote:> The ability to set speed and duplex for virtio_net is useful in various
> scenarios as described here:
> 
> 16032be virtio_net: add ethtool support for set and get of settings
> 
> However, it would be nice to be able to set this from the hypervisor,
> such that virtio_net doesn't require custom guest ethtool commands.
> 
> 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'.
> 
> Note that VIRTIO_NET_F_SPEED_DUPLEX is defined as bit 63, the intention
> is that device feature bits are to grow down from bit 63, since the
> transports are starting from bit 24 and growing up.
> 
> Signed-off-by: Jason Baron <jbaron at akamai.com>
> Cc: "Michael S. Tsirkin" <mst at redhat.com>
> Cc: Jason Wang <jasowang at redhat.com>
> Cc: virtio-dev at lists.oasis-open.org
> ---
>  drivers/net/virtio_net.c        | 19 ++++++++++++++++++-
>  include/uapi/linux/virtio_net.h | 13 +++++++++++++
>  2 files changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 6fb7b65..0b2d314 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2146,6 +2146,22 @@ static void virtnet_config_changed_work(struct
work_struct *work)
>  
>  	vi->status = v;
>  
> +	if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) {
> +		u32 speed;
> +		u8 duplex;
> +
> +		speed = virtio_cread32(vi->vdev,
> +				       offsetof(struct virtio_net_config,
> +						speed));
> +		if (ethtool_validate_speed(speed))
> +			vi->speed = speed;
> +		duplex = virtio_cread8(vi->vdev,
> +				       offsetof(struct virtio_net_config,
> +						duplex));
> +		if (ethtool_validate_duplex(duplex))
> +			vi->duplex = duplex;
> +	}
> +
>  	if (vi->status & VIRTIO_NET_S_LINK_UP) {
>  		netif_carrier_on(vi->dev);
>  		netif_tx_wake_all_queues(vi->dev);
> @@ -2796,7 +2812,8 @@ static struct virtio_device_id id_table[] = {
>  	VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
>  	VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
>  	VIRTIO_NET_F_CTRL_MAC_ADDR, \
> -	VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
> +	VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
> +	VIRTIO_NET_F_SPEED_DUPLEX
>  
>  static unsigned int features[] = {
>  	VIRTNET_FEATURES,
Still missing the update from virtnet_config_changed_work, and I think
it's important to reflex host changes within guest when the
feature bit has been acked.
> diff --git a/include/uapi/linux/virtio_net.h
b/include/uapi/linux/virtio_net.h
> index fc353b5..5de6ed3 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/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 {
>  	__u16 max_virtqueue_pairs;
>  	/* Default maximum transmit unit advice */
>  	__u16 mtu;
> +	/*
> +	 * speed, in units of 1Mb. All values 0 to INT_MAX are legal.
> +	 * Any other value stands for unknown.
> +	 */
> +	__u32 speed;
> +	/*
> +	 * 0x00 - half duplex
> +	 * 0x01 - full duplex
> +	 * Any other value stands for unknown.
> +	 */
> +	__u8 duplex;
>  } __attribute__((packed));
>  
>  /*
> -- 
> 2.6.1

Michael S. Tsirkin

2018-Jan-04 17:05 UTC

head link

[PATCH net-next v3 1/3] virtio_net: propagate linkspeed/duplex settings from the hypervisor

On Thu, Jan 04, 2018 at 12:16:44AM -0500, Jason Baron
wrote:> The ability to set speed and duplex for virtio_net is useful in various
> scenarios as described here:
> 
> 16032be virtio_net: add ethtool support for set and get of settings
> 
> However, it would be nice to be able to set this from the hypervisor,
> such that virtio_net doesn't require custom guest ethtool commands.
> 
> 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'.
> 
> Note that VIRTIO_NET_F_SPEED_DUPLEX is defined as bit 63, the intention
> is that device feature bits are to grow down from bit 63, since the
> transports are starting from bit 24 and growing up.
> 
> Signed-off-by: Jason Baron <jbaron at akamai.com>
> Cc: "Michael S. Tsirkin" <mst at redhat.com>
> Cc: Jason Wang <jasowang at redhat.com>
> Cc: virtio-dev at lists.oasis-open.org
> ---
>  drivers/net/virtio_net.c        | 19 ++++++++++++++++++-
>  include/uapi/linux/virtio_net.h | 13 +++++++++++++
>  2 files changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 6fb7b65..0b2d314 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2146,6 +2146,22 @@ static void virtnet_config_changed_work(struct
work_struct *work)
>  
>  	vi->status = v;
>  
> +	if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) {
BTW we can avoid this read for when link goes down.
Not a big deal but still.
> +		u32 speed;
> +		u8 duplex;
> +
> +		speed = virtio_cread32(vi->vdev,
> +				       offsetof(struct virtio_net_config,
> +						speed));
> +		if (ethtool_validate_speed(speed))
> +			vi->speed = speed;
> +		duplex = virtio_cread8(vi->vdev,
> +				       offsetof(struct virtio_net_config,
> +						duplex));
> +		if (ethtool_validate_duplex(duplex))
> +			vi->duplex = duplex;
> +	}
> +
>  	if (vi->status & VIRTIO_NET_S_LINK_UP) {
>  		netif_carrier_on(vi->dev);
>  		netif_tx_wake_all_queues(vi->dev);
OK so this handles the case when VIRTIO_NET_F_STATUS is set,
but when it's clear we need to call this from virtnet_probe.

I propose moving this chunk to a function and calling from two places.

> @@ -2796,7 +2812,8 @@ static struct virtio_device_id id_table[] = {
>  	VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
>  	VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
>  	VIRTIO_NET_F_CTRL_MAC_ADDR, \
> -	VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
> +	VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
> +	VIRTIO_NET_F_SPEED_DUPLEX
>  
>  static unsigned int features[] = {
>  	VIRTNET_FEATURES,
> diff --git a/include/uapi/linux/virtio_net.h
b/include/uapi/linux/virtio_net.h
> index fc353b5..5de6ed3 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/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 {
>  	__u16 max_virtqueue_pairs;
>  	/* Default maximum transmit unit advice */
>  	__u16 mtu;
> +	/*
> +	 * speed, in units of 1Mb. All values 0 to INT_MAX are legal.
> +	 * Any other value stands for unknown.
> +	 */
> +	__u32 speed;
> +	/*
> +	 * 0x00 - half duplex
> +	 * 0x01 - full duplex
> +	 * Any other value stands for unknown.
> +	 */
> +	__u8 duplex;
>  } __attribute__((packed));
>  
>  /*
> -- 
> 2.6.1

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