From aba21aff772b8622e08f07219069be793429a48f Mon Sep 17 00:00:00 2001 From: Eli Cohen Date: Wed, 5 Jan 2022 13:46:37 +0200 Subject: vdpa: Allow to configure max data virtqueues Add netlink support to configure the max virtqueue pairs for a device. At least one pair is required. The maximum is dictated by the device. Example: $ vdpa dev add name vdpa-a mgmtdev auxiliary/mlx5_core.sf.1 max_vqp 4 Signed-off-by: Eli Cohen Link: https://lore.kernel.org/r/20220105114646.577224-6-elic@nvidia.com Signed-off-by: Michael S. Tsirkin --- include/linux/vdpa.h | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) (limited to 'include/linux') diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index ae047fae2603..6d4d7e4fe208 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -101,6 +101,7 @@ struct vdpa_dev_set_config { struct { u8 mac[ETH_ALEN]; u16 mtu; + u16 max_vq_pairs; } net; u64 mask; }; @@ -391,17 +392,29 @@ static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) static inline int vdpa_reset(struct vdpa_device *vdev) { const struct vdpa_config_ops *ops = vdev->config; + int ret; + mutex_lock(&vdev->cf_mutex); vdev->features_valid = false; - return ops->reset(vdev); + ret = ops->reset(vdev); + mutex_unlock(&vdev->cf_mutex); + return ret; } -static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) +static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features, bool locked) { const struct vdpa_config_ops *ops = vdev->config; + int ret; + + if (!locked) + mutex_lock(&vdev->cf_mutex); vdev->features_valid = true; - return ops->set_driver_features(vdev, features); + ret = ops->set_driver_features(vdev, features); + if (!locked) + mutex_unlock(&vdev->cf_mutex); + + return ret; } void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset, -- cgit v1.2.3