diff options
Diffstat (limited to 'drivers/vdpa/vdpa_sim/vdpa_sim.c')
| -rw-r--r-- | drivers/vdpa/vdpa_sim/vdpa_sim.c | 33 |
1 files changed, 28 insertions, 5 deletions
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c index a9bc5e0fb353..b7d5727fde4c 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c @@ -24,6 +24,7 @@ #include <linux/etherdevice.h> #include <linux/vringh.h> #include <linux/vdpa.h> +#include <linux/virtio_byteorder.h> #include <linux/vhost_iotlb.h> #include <uapi/linux/virtio_config.h> #include <uapi/linux/virtio_net.h> @@ -72,6 +73,23 @@ struct vdpasim { u64 features; }; +/* TODO: cross-endian support */ +static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim) +{ + return virtio_legacy_is_little_endian() || + (vdpasim->features & (1ULL << VIRTIO_F_VERSION_1)); +} + +static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val) +{ + return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val); +} + +static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val) +{ + return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val); +} + static struct vdpasim *vdpasim_dev; static struct vdpasim *vdpa_to_sim(struct vdpa_device *vdpa) @@ -306,7 +324,6 @@ static const struct vdpa_config_ops vdpasim_net_config_ops; static struct vdpasim *vdpasim_create(void) { - struct virtio_net_config *config; struct vdpasim *vdpasim; struct device *dev; int ret = -ENOMEM; @@ -331,10 +348,7 @@ static struct vdpasim *vdpasim_create(void) if (!vdpasim->buffer) goto err_iommu; - config = &vdpasim->config; - config->mtu = 1500; - config->status = VIRTIO_NET_S_LINK_UP; - eth_random_addr(config->mac); + eth_random_addr(vdpasim->config.mac); vringh_set_iotlb(&vdpasim->vqs[0].vring, vdpasim->iommu); vringh_set_iotlb(&vdpasim->vqs[1].vring, vdpasim->iommu); @@ -448,6 +462,7 @@ static u64 vdpasim_get_features(struct vdpa_device *vdpa) static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features) { struct vdpasim *vdpasim = vdpa_to_sim(vdpa); + struct virtio_net_config *config = &vdpasim->config; /* DMA mapping must be done by driver */ if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) @@ -455,6 +470,14 @@ static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features) vdpasim->features = features & vdpasim_features; + /* We generally only know whether guest is using the legacy interface + * here, so generally that's the earliest we can set config fields. + * Note: We actually require VIRTIO_F_ACCESS_PLATFORM above which + * implies VIRTIO_F_VERSION_1, but let's not try to be clever here. + */ + + config->mtu = cpu_to_vdpasim16(vdpasim, 1500); + config->status = cpu_to_vdpasim16(vdpasim, VIRTIO_NET_S_LINK_UP); return 0; } |