Re: [PATCH vhost v6 2/6] virtio: remove support for names array entries being null.

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On Wed, Mar 27, 2024 at 5:58 PM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote:
>
> commit 6457f126c888 ("virtio: support reserved vqs") introduced this
> support. Multiqueue virtio-net use 2N as ctrl vq finally, so the logic
> doesn't apply. And not one uses this.
>
> On the other side, that makes some trouble for us to refactor the
> find_vqs() params.
>
> So I remove this support.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> ---
>  arch/um/drivers/virtio_uml.c           |  8 ++++----
>  drivers/remoteproc/remoteproc_virtio.c | 11 ++++-------
>  drivers/s390/virtio/virtio_ccw.c       |  8 ++++----
>  drivers/virtio/virtio_mmio.c           |  8 ++++----
>  drivers/virtio/virtio_pci_common.c     | 18 +++++++++---------
>  drivers/virtio/virtio_vdpa.c           | 11 ++++-------
>  include/linux/virtio_config.h          |  2 +-
>  7 files changed, 30 insertions(+), 36 deletions(-)
>
> diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
> index 8adca2000e51..773f9fc4d582 100644
> --- a/arch/um/drivers/virtio_uml.c
> +++ b/arch/um/drivers/virtio_uml.c
> @@ -1019,8 +1019,8 @@ static int vu_find_vqs(struct virtio_device *vdev, unsigned nvqs,
>                        struct irq_affinity *desc)
>  {
>         struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
> -       int i, queue_idx = 0, rc;
>         struct virtqueue *vq;
> +       int i, rc;
>
>         /* not supported for now */
>         if (WARN_ON(nvqs > 64))
> @@ -1032,11 +1032,11 @@ static int vu_find_vqs(struct virtio_device *vdev, unsigned nvqs,
>
>         for (i = 0; i < nvqs; ++i) {
>                 if (!names[i]) {
> -                       vqs[i] = NULL;
> -                       continue;
> +                       rc = -EINVAL;
> +                       goto error_setup;
>                 }
>
> -               vqs[i] = vu_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
> +               vqs[i] = vu_setup_vq(vdev, i, callbacks[i], names[i],
>                                      ctx ? ctx[i] : false);
>                 if (IS_ERR(vqs[i])) {
>                         rc = PTR_ERR(vqs[i]);
> diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> index 83d76915a6ad..8fb5118b6953 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -119,9 +119,6 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
>         if (id >= ARRAY_SIZE(rvdev->vring))
>                 return ERR_PTR(-EINVAL);
>
> -       if (!name)
> -               return NULL;
> -
>         /* Search allocated memory region by name */
>         mem = rproc_find_carveout_by_name(rproc, "vdev%dvring%d", rvdev->index,
>                                           id);
> @@ -187,15 +184,15 @@ static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
>                                  const bool * ctx,
>                                  struct irq_affinity *desc)
>  {
> -       int i, ret, queue_idx = 0;
> +       int i, ret;
>
>         for (i = 0; i < nvqs; ++i) {
>                 if (!names[i]) {
> -                       vqs[i] = NULL;
> -                       continue;
> +                       ret = -EINVAL;
> +                       goto error;
>                 }
>
> -               vqs[i] = rp_find_vq(vdev, queue_idx++, callbacks[i], names[i],
> +               vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i],
>                                     ctx ? ctx[i] : false);
>                 if (IS_ERR(vqs[i])) {
>                         ret = PTR_ERR(vqs[i]);
> diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
> index ac67576301bf..508154705554 100644
> --- a/drivers/s390/virtio/virtio_ccw.c
> +++ b/drivers/s390/virtio/virtio_ccw.c
> @@ -659,7 +659,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
>  {
>         struct virtio_ccw_device *vcdev = to_vc_device(vdev);
>         unsigned long *indicatorp = NULL;
> -       int ret, i, queue_idx = 0;
> +       int ret, i;
>         struct ccw1 *ccw;
>
>         ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
> @@ -668,11 +668,11 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
>
>         for (i = 0; i < nvqs; ++i) {
>                 if (!names[i]) {
> -                       vqs[i] = NULL;
> -                       continue;
> +                       ret = -EINVAL;
> +                       goto out;
>                 }
>
> -               vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i],
> +               vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i],

Nit:

This seems an unnecessary change or we need to remove the queue_idx variable.

>                                              names[i], ctx ? ctx[i] : false,
>                                              ccw);
>                 if (IS_ERR(vqs[i])) {
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 59892a31cf76..82ee4a288728 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -496,7 +496,7 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
>  {
>         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
>         int irq = platform_get_irq(vm_dev->pdev, 0);
> -       int i, err, queue_idx = 0;
> +       int i, err;
>
>         if (irq < 0)
>                 return irq;
> @@ -511,11 +511,11 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
>
>         for (i = 0; i < nvqs; ++i) {
>                 if (!names[i]) {
> -                       vqs[i] = NULL;
> -                       continue;
> +                       vm_del_vqs(vdev);
> +                       return -EINVAL;
>                 }
>
> -               vqs[i] = vm_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
> +               vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i],

Similar issue as above.

>                                      ctx ? ctx[i] : false);
>                 if (IS_ERR(vqs[i])) {
>                         vm_del_vqs(vdev);
> diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
> index b655fccaf773..eda71c6e87ee 100644
> --- a/drivers/virtio/virtio_pci_common.c
> +++ b/drivers/virtio/virtio_pci_common.c
> @@ -292,7 +292,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
>  {
>         struct virtio_pci_device *vp_dev = to_vp_device(vdev);
>         u16 msix_vec;
> -       int i, err, nvectors, allocated_vectors, queue_idx = 0;
> +       int i, err, nvectors, allocated_vectors;
>
>         vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
>         if (!vp_dev->vqs)
> @@ -302,7 +302,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
>                 /* Best option: one for change interrupt, one per vq. */
>                 nvectors = 1;
>                 for (i = 0; i < nvqs; ++i)
> -                       if (names[i] && callbacks[i])
> +                       if (callbacks[i])
>                                 ++nvectors;
>         } else {
>                 /* Second best: one for change, shared for all vqs. */
> @@ -318,8 +318,8 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
>         allocated_vectors = vp_dev->msix_used_vectors;
>         for (i = 0; i < nvqs; ++i) {
>                 if (!names[i]) {
> -                       vqs[i] = NULL;
> -                       continue;
> +                       err = -EINVAL;
> +                       goto error_find;
>                 }
>
>                 if (!callbacks[i])
> @@ -328,7 +328,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
>                         msix_vec = allocated_vectors++;
>                 else
>                         msix_vec = VP_MSIX_VQ_VECTOR;
> -               vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
> +               vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
>                                      ctx ? ctx[i] : false,
>                                      msix_vec);
>                 if (IS_ERR(vqs[i])) {
> @@ -363,7 +363,7 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,
>                 const char * const names[], const bool *ctx)
>  {
>         struct virtio_pci_device *vp_dev = to_vp_device(vdev);
> -       int i, err, queue_idx = 0;
> +       int i, err;
>
>         vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
>         if (!vp_dev->vqs)
> @@ -378,10 +378,10 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,
>         vp_dev->per_vq_vectors = false;
>         for (i = 0; i < nvqs; ++i) {
>                 if (!names[i]) {
> -                       vqs[i] = NULL;
> -                       continue;
> +                       err = -EINVAL;
> +                       goto out_del_vqs;
>                 }
> -               vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
> +               vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
>                                      ctx ? ctx[i] : false,
>                                      VIRTIO_MSI_NO_VECTOR);
>                 if (IS_ERR(vqs[i])) {
> diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
> index e803db0da307..e82cca24d6e6 100644
> --- a/drivers/virtio/virtio_vdpa.c
> +++ b/drivers/virtio/virtio_vdpa.c
> @@ -161,9 +161,6 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
>         bool may_reduce_num = true;
>         int err;
>
> -       if (!name)
> -               return NULL;
> -
>         if (index >= vdpa->nvqs)
>                 return ERR_PTR(-ENOENT);
>
> @@ -370,7 +367,7 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
>         struct cpumask *masks;
>         struct vdpa_callback cb;
>         bool has_affinity = desc && ops->set_vq_affinity;
> -       int i, err, queue_idx = 0;
> +       int i, err;
>
>         if (has_affinity) {
>                 masks = create_affinity_masks(nvqs, desc ? desc : &default_affd);
> @@ -380,11 +377,11 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
>
>         for (i = 0; i < nvqs; ++i) {
>                 if (!names[i]) {
> -                       vqs[i] = NULL;
> -                       continue;
> +                       err = -EINVAL;
> +                       goto err_setup_vq;
>                 }
>
> -               vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++,
> +               vqs[i] = virtio_vdpa_setup_vq(vdev, i,

And here.

With those fixed.

Acked-by: Jason Wang <jasowang@xxxxxxxxxx>

Thanks

>                                               callbacks[i], names[i], ctx ?
>                                               ctx[i] : false);
>                 if (IS_ERR(vqs[i])) {
> diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> index da9b271b54db..1c79cec258f4 100644
> --- a/include/linux/virtio_config.h
> +++ b/include/linux/virtio_config.h
> @@ -56,7 +56,7 @@ typedef void vq_callback_t(struct virtqueue *);
>   *     callbacks: array of callbacks, for each virtqueue
>   *             include a NULL entry for vqs that do not need a callback
>   *     names: array of virtqueue names (mainly for debugging)
> - *             include a NULL entry for vqs unused by driver
> + *             MUST NOT be NULL
>   *     Returns 0 on success or error status
>   * @del_vqs: free virtqueues found by find_vqs().
>   * @synchronize_cbs: synchronize with the virtqueue callbacks (optional)
> --
> 2.32.0.3.g01195cf9f
>
>






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