[PATCH v3 4/9] vhost: Add API to get MTU value
From: Maxime Coquelin <hidden>
Date: 2017-03-12 16:34:30
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
This patch implements the function for the application to get the MTU value. rte_vhost_get_mtu() fills the mtu parameter with the MTU value set in QEMU if VIRTIO_NET_F_MTU has been negotiated and returns 0, -ENOTSUP otherwise. The function returns -EAGAIN if Virtio feature negotiation didn't happened yet. Signed-off-by: Maxime Coquelin <redacted> --- lib/librte_vhost/rte_virtio_net.h | 15 +++++++++++++++ lib/librte_vhost/vhost.c | 19 +++++++++++++++++++ 2 files changed, 34 insertions(+)
diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
index 926039c..56829aa 100644
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h@@ -100,6 +100,21 @@ int rte_vhost_driver_callback_register(struct virtio_net_device_ops const * cons int rte_vhost_driver_session_start(void); /** + * Get the MTU value of the device if set in QEMU. + * + * @param vid + * virtio-net device ID + * @param mtu + * The variable to store the MTU value + * + * @return + * 0: success + * -EAGAIN: device not yet started + * -ENOTSUP: device does not support MTU feature + */ +int rte_vhost_get_mtu(int vid, uint16_t *mtu); + +/** * Get the numa node from which the virtio net device's memory * is allocated. *
diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 3974087..80a75e0 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c@@ -313,6 +313,25 @@ vhost_enable_dequeue_zero_copy(int vid) } int +rte_vhost_get_mtu(int vid, uint16_t *mtu) +{ + struct virtio_net *dev = get_device(vid); + + if (!dev) + return -ENODEV; + + if (!(dev->flags & VIRTIO_DEV_READY)) + return -EAGAIN; + + if (!(dev->features & VIRTIO_NET_F_MTU)) + return -ENOTSUP; + + *mtu = dev->mtu; + + return 0; +} + +int rte_vhost_get_numa_node(int vid) { #ifdef RTE_LIBRTE_VHOST_NUMA
--
2.9.3