[PATCH vhost 0/4] refactor the params of find_vqs()

[PATCH vhost 0/4] refactor the params of find_vqs()

[Xuan Zhuo]

This pathset is splited from the

     http://lore.kernel.org/all/20240229072044.77388-1-xuanzhuo@linux.alibaba.com

That may needs some cycles to discuss. But that notifies too many people.

But just the four commits need to notify so many people.
And four commits are independent. So I split that patch set,
let us review these first.

The patch set try to  refactor the params of find_vqs().
Then we can just change the structure, when introducing new
features.

Thanks.

Xuan Zhuo (4):
  virtio: find_vqs: pass struct instead of multi parameters
  virtio: vring_create_virtqueue: pass struct instead of multi
    parameters
  virtio: vring_new_virtqueue(): pass struct instead of multi parameters
  virtio_ring: simplify the parameters of the funcs related to
    vring_create/new_virtqueue()

 arch/um/drivers/virtio_uml.c             |  31 ++--
 drivers/platform/mellanox/mlxbf-tmfifo.c |  24 ++--
 drivers/remoteproc/remoteproc_virtio.c   |  31 ++--
 drivers/s390/virtio/virtio_ccw.c         |  33 ++---
 drivers/virtio/virtio_mmio.c             |  30 ++--
 drivers/virtio/virtio_pci_common.c       |  59 ++++----
 drivers/virtio/virtio_pci_common.h       |   9 +-
 drivers/virtio/virtio_pci_legacy.c       |  16 ++-
 drivers/virtio/virtio_pci_modern.c       |  38 +++--
 drivers/virtio/virtio_ring.c             | 173 ++++++++---------------
 drivers/virtio/virtio_vdpa.c             |  45 +++---
 include/linux/virtio_config.h            |  51 +++++--
 include/linux/virtio_ring.h              |  82 ++++++-----
 tools/virtio/virtio_test.c               |   4 +-
 tools/virtio/vringh_test.c               |  28 ++--
 15 files changed, 328 insertions(+), 326 deletions(-)

--
2.32.0.3.g01195cf9f

[PATCH vhost 1/4] virtio: find_vqs: pass struct instead of multi parameters

[Xuan Zhuo]

Now, we pass multi parameters to find_vqs. These parameters
may work for transport or work for vring.

And find_vqs has multi implements in many places:

 arch/um/drivers/virtio_uml.c
 drivers/platform/mellanox/mlxbf-tmfifo.c
 drivers/remoteproc/remoteproc_virtio.c
 drivers/s390/virtio/virtio_ccw.c
 drivers/virtio/virtio_mmio.c
 drivers/virtio/virtio_pci_legacy.c
 drivers/virtio/virtio_pci_modern.c
 drivers/virtio/virtio_vdpa.c

Every time, we try to add a new parameter, that is difficult.
We must change every find_vqs implement.

One the other side, if we want to pass a parameter to vring,
we must change the call path from transport to vring.
Too many functions need to be changed.

So it is time to refactor the find_vqs. We pass a structure
cfg to find_vqs(), that will be passed to vring by transport.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 arch/um/drivers/virtio_uml.c             | 23 ++++-----
 drivers/platform/mellanox/mlxbf-tmfifo.c | 13 ++----
 drivers/remoteproc/remoteproc_virtio.c   | 28 ++++++-----
 drivers/s390/virtio/virtio_ccw.c         | 29 ++++++------
 drivers/virtio/virtio_mmio.c             | 26 +++++------
 drivers/virtio/virtio_pci_common.c       | 59 +++++++++++-------------
 drivers/virtio/virtio_pci_common.h       |  9 +---
 drivers/virtio/virtio_pci_legacy.c       | 11 +++--
 drivers/virtio/virtio_pci_modern.c       | 33 +++++++------
 drivers/virtio/virtio_vdpa.c             | 36 +++++++--------
 include/linux/virtio_config.h            | 51 ++++++++++++++++----
 11 files changed, 172 insertions(+), 146 deletions(-)

diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index 8adca2000e51..c13dfeeb90c4 100644
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -937,8 +937,8 @@ static int vu_setup_vq_call_fd(struct virtio_uml_device *vu_dev,
 }
 
 static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
-				     unsigned index, vq_callback_t *callback,
-				     const char *name, bool ctx)
+				     unsigned index,
+				     struct virtio_vq_config *cfg)
 {
 	struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
 	struct platform_device *pdev = vu_dev->pdev;
@@ -953,10 +953,12 @@ static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
 		goto error_kzalloc;
 	}
 	snprintf(info->name, sizeof(info->name), "%s.%d-%s", pdev->name,
-		 pdev->id, name);
+		 pdev->id, cfg->names[cfg->cfg_idx]);
 
 	vq = vring_create_virtqueue(index, num, PAGE_SIZE, vdev, true, true,
-				    ctx, vu_notify, callback, info->name);
+				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
+				    vu_notify,
+				    cfg->callbacks[cfg->cfg_idx], info->name);
 	if (!vq) {
 		rc = -ENOMEM;
 		goto error_create;
@@ -1013,12 +1015,11 @@ static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
 	return ERR_PTR(rc);
 }
 
-static int vu_find_vqs(struct virtio_device *vdev, unsigned nvqs,
-		       struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		       const char * const names[], const bool *ctx,
-		       struct irq_affinity *desc)
+static int vu_find_vqs(struct virtio_device *vdev, struct virtio_vq_config *cfg)
 {
 	struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
+	struct virtqueue **vqs = cfg->vqs;
+	unsigned int nvqs = cfg->nvqs;
 	int i, queue_idx = 0, rc;
 	struct virtqueue *vq;
 
@@ -1031,13 +1032,13 @@ static int vu_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 		return rc;
 
 	for (i = 0; i < nvqs; ++i) {
-		if (!names[i]) {
+		if (!cfg->names[i]) {
 			vqs[i] = NULL;
 			continue;
 		}
 
-		vqs[i] = vu_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
-				     ctx ? ctx[i] : false);
+		cfg->cfg_idx = i;
+		vqs[i] = vu_setup_vq(vdev, queue_idx++, cfg);
 		if (IS_ERR(vqs[i])) {
 			rc = PTR_ERR(vqs[i]);
 			goto error_setup;
diff --git a/drivers/platform/mellanox/mlxbf-tmfifo.c b/drivers/platform/mellanox/mlxbf-tmfifo.c
index b8d1e32e97eb..4252388f52a2 100644
--- a/drivers/platform/mellanox/mlxbf-tmfifo.c
+++ b/drivers/platform/mellanox/mlxbf-tmfifo.c
@@ -1056,15 +1056,12 @@ static void mlxbf_tmfifo_virtio_del_vqs(struct virtio_device *vdev)
 
 /* Create and initialize the virtual queues. */
 static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev,
-					unsigned int nvqs,
-					struct virtqueue *vqs[],
-					vq_callback_t *callbacks[],
-					const char * const names[],
-					const bool *ctx,
-					struct irq_affinity *desc)
+					struct virtio_vq_config *cfg)
 {
 	struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
+	struct virtqueue **vqs = cfg->vqs;
 	struct mlxbf_tmfifo_vring *vring;
+	unsigned int nvqs = cfg->nvqs;
 	struct virtqueue *vq;
 	int i, ret, size;
 
@@ -1072,7 +1069,7 @@ static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev,
 		return -EINVAL;
 
 	for (i = 0; i < nvqs; ++i) {
-		if (!names[i]) {
+		if (!cfg->names[i]) {
 			ret = -EINVAL;
 			goto error;
 		}
@@ -1084,7 +1081,7 @@ static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev,
 		vq = vring_new_virtqueue(i, vring->num, vring->align, vdev,
 					 false, false, vring->va,
 					 mlxbf_tmfifo_virtio_notify,
-					 callbacks[i], names[i]);
+					 cfg->callbacks[i], cfg->names[i]);
 		if (!vq) {
 			dev_err(&vdev->dev, "vring_new_virtqueue failed\n");
 			ret = -ENOMEM;
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 83d76915a6ad..57d51c9c7b63 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -102,8 +102,7 @@ EXPORT_SYMBOL(rproc_vq_interrupt);
 
 static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
 				    unsigned int id,
-				    void (*callback)(struct virtqueue *vq),
-				    const char *name, bool ctx)
+				    struct virtio_vq_config *cfg)
 {
 	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
 	struct rproc *rproc = vdev_to_rproc(vdev);
@@ -119,7 +118,7 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
 	if (id >= ARRAY_SIZE(rvdev->vring))
 		return ERR_PTR(-EINVAL);
 
-	if (!name)
+	if (!cfg->names[cfg->cfg_idx])
 		return NULL;
 
 	/* Search allocated memory region by name */
@@ -143,10 +142,12 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
 	 * Create the new vq, and tell virtio we're not interested in
 	 * the 'weak' smp barriers, since we're talking with a real device.
 	 */
-	vq = vring_new_virtqueue(id, num, rvring->align, vdev, false, ctx,
-				 addr, rproc_virtio_notify, callback, name);
+	vq = vring_new_virtqueue(id, num, rvring->align, vdev, false,
+				 cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
+				 addr, rproc_virtio_notify, cfg->callbacks[cfg->cfg_idx],
+				 cfg->names[cfg->cfg_idx]);
 	if (!vq) {
-		dev_err(dev, "vring_new_virtqueue %s failed\n", name);
+		dev_err(dev, "vring_new_virtqueue %s failed\n", cfg->names[cfg->cfg_idx]);
 		rproc_free_vring(rvring);
 		return ERR_PTR(-ENOMEM);
 	}
@@ -180,23 +181,20 @@ static void rproc_virtio_del_vqs(struct virtio_device *vdev)
 	__rproc_virtio_del_vqs(vdev);
 }
 
-static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
-				 struct virtqueue *vqs[],
-				 vq_callback_t *callbacks[],
-				 const char * const names[],
-				 const bool * ctx,
-				 struct irq_affinity *desc)
+static int rproc_virtio_find_vqs(struct virtio_device *vdev, struct virtio_vq_config *cfg)
 {
+	struct virtqueue **vqs = cfg->vqs;
+	unsigned int nvqs = cfg->nvqs;
 	int i, ret, queue_idx = 0;
 
 	for (i = 0; i < nvqs; ++i) {
-		if (!names[i]) {
+		if (!cfg->names[i]) {
 			vqs[i] = NULL;
 			continue;
 		}
 
-		vqs[i] = rp_find_vq(vdev, queue_idx++, callbacks[i], names[i],
-				    ctx ? ctx[i] : false);
+		cfg->cfg_idx = i;
+		vqs[i] = rp_find_vq(vdev, queue_idx++, cfg);
 		if (IS_ERR(vqs[i])) {
 			ret = PTR_ERR(vqs[i]);
 			goto error;
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index ac67576301bf..11eea5086cff 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -499,9 +499,8 @@ static void virtio_ccw_del_vqs(struct virtio_device *vdev)
 }
 
 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
-					     int i, vq_callback_t *callback,
-					     const char *name, bool ctx,
-					     struct ccw1 *ccw)
+					     int i, struct ccw1 *ccw,
+					     struct virtio_vq_config *cfg)
 {
 	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
 	bool (*notify)(struct virtqueue *vq);
@@ -538,8 +537,11 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
 	}
 	may_reduce = vcdev->revision > 0;
 	vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN,
-				    vdev, true, may_reduce, ctx,
-				    notify, callback, name);
+				    vdev, true, may_reduce,
+				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
+				    notify,
+				    cfg->callbacks[cfg->cfg_idx],
+				    cfg->names[cfg->cfg_idx]);
 
 	if (!vq) {
 		/* For now, we fail if we can't get the requested size. */
@@ -650,15 +652,13 @@ static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
 	return ret;
 }
 
-static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
-			       struct virtqueue *vqs[],
-			       vq_callback_t *callbacks[],
-			       const char * const names[],
-			       const bool *ctx,
-			       struct irq_affinity *desc)
+static int virtio_ccw_find_vqs(struct virtio_device *vdev,
+			       struct virtio_vq_config *cfg)
 {
 	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
+	struct virtqueue **vqs = cfg->vqs;
 	unsigned long *indicatorp = NULL;
+	unsigned int nvqs = cfg->nvqs;
 	int ret, i, queue_idx = 0;
 	struct ccw1 *ccw;
 
@@ -667,14 +667,13 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 		return -ENOMEM;
 
 	for (i = 0; i < nvqs; ++i) {
-		if (!names[i]) {
+		if (!cfg->names[i]) {
 			vqs[i] = NULL;
 			continue;
 		}
 
-		vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i],
-					     names[i], ctx ? ctx[i] : false,
-					     ccw);
+		cfg->cfg_idx = i;
+		vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, ccw, cfg);
 		if (IS_ERR(vqs[i])) {
 			ret = PTR_ERR(vqs[i]);
 			vqs[i] = NULL;
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 59892a31cf76..feb823d279d2 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -370,8 +370,7 @@ static void vm_synchronize_cbs(struct virtio_device *vdev)
 }
 
 static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int index,
-				  void (*callback)(struct virtqueue *vq),
-				  const char *name, bool ctx)
+				     struct virtio_vq_config *cfg)
 {
 	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
 	bool (*notify)(struct virtqueue *vq);
@@ -386,7 +385,7 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
 	else
 		notify = vm_notify;
 
-	if (!name)
+	if (!cfg->names[index])
 		return NULL;
 
 	/* Select the queue we're interested in */
@@ -414,7 +413,11 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
 
 	/* Create the vring */
 	vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev,
-				 true, true, ctx, notify, callback, name);
+				 true, true,
+				 cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
+				 notify,
+				 cfg->callbacks[cfg->cfg_idx],
+				 cfg->names[cfg->cfg_idx]);
 	if (!vq) {
 		err = -ENOMEM;
 		goto error_new_virtqueue;
@@ -487,15 +490,12 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
 	return ERR_PTR(err);
 }
 
-static int vm_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
-		       struct virtqueue *vqs[],
-		       vq_callback_t *callbacks[],
-		       const char * const names[],
-		       const bool *ctx,
-		       struct irq_affinity *desc)
+static int vm_find_vqs(struct virtio_device *vdev, struct virtio_vq_config *cfg)
 {
 	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
 	int irq = platform_get_irq(vm_dev->pdev, 0);
+	struct virtqueue **vqs = cfg->vqs;
+	unsigned int nvqs = cfg->nvqs;
 	int i, err, queue_idx = 0;
 
 	if (irq < 0)
@@ -510,13 +510,13 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 		enable_irq_wake(irq);
 
 	for (i = 0; i < nvqs; ++i) {
-		if (!names[i]) {
+		if (!cfg->names[i]) {
 			vqs[i] = NULL;
 			continue;
 		}
 
-		vqs[i] = vm_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
-				     ctx ? ctx[i] : false);
+		cfg->cfg_idx = i;
+		vqs[i] = vm_setup_vq(vdev, queue_idx++, cfg);
 		if (IS_ERR(vqs[i])) {
 			vm_del_vqs(vdev);
 			return PTR_ERR(vqs[i]);
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index b655fccaf773..a9ae03904dcf 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -172,9 +172,7 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
 }
 
 static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int index,
-				     void (*callback)(struct virtqueue *vq),
-				     const char *name,
-				     bool ctx,
+				     struct virtio_vq_config *cfg,
 				     u16 msix_vec)
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
@@ -186,13 +184,13 @@ static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int in
 	if (!info)
 		return ERR_PTR(-ENOMEM);
 
-	vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx,
+	vq = vp_dev->setup_vq(vp_dev, info, index, cfg,
 			      msix_vec);
 	if (IS_ERR(vq))
 		goto out_info;
 
 	info->vq = vq;
-	if (callback) {
+	if (cfg->callbacks[cfg->cfg_idx]) {
 		spin_lock_irqsave(&vp_dev->lock, flags);
 		list_add(&info->node, &vp_dev->virtqueues);
 		spin_unlock_irqrestore(&vp_dev->lock, flags);
@@ -284,15 +282,15 @@ void vp_del_vqs(struct virtio_device *vdev)
 	vp_dev->vqs = NULL;
 }
 
-static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
-		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], bool per_vq_vectors,
-		const bool *ctx,
-		struct irq_affinity *desc)
+static int vp_find_vqs_msix(struct virtio_device *vdev,
+			    struct virtio_vq_config *cfg,
+			    bool per_vq_vectors)
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
 	u16 msix_vec;
 	int i, err, nvectors, allocated_vectors, queue_idx = 0;
+	struct virtqueue **vqs = cfg->vqs;
+	unsigned int nvqs = cfg->nvqs;
 
 	vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
 	if (!vp_dev->vqs)
@@ -302,7 +300,7 @@ 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 (cfg->names[i] && cfg->callbacks[i])
 				++nvectors;
 	} else {
 		/* Second best: one for change, shared for all vqs. */
@@ -310,27 +308,27 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
 	}
 
 	err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors,
-				      per_vq_vectors ? desc : NULL);
+				      per_vq_vectors ? cfg->desc : NULL);
 	if (err)
 		goto error_find;
 
 	vp_dev->per_vq_vectors = per_vq_vectors;
 	allocated_vectors = vp_dev->msix_used_vectors;
 	for (i = 0; i < nvqs; ++i) {
-		if (!names[i]) {
+		if (!cfg->names[i]) {
 			vqs[i] = NULL;
 			continue;
 		}
 
-		if (!callbacks[i])
+		if (!cfg->callbacks[i])
 			msix_vec = VIRTIO_MSI_NO_VECTOR;
 		else if (vp_dev->per_vq_vectors)
 			msix_vec = allocated_vectors++;
 		else
 			msix_vec = VP_MSIX_VQ_VECTOR;
-		vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
-				     ctx ? ctx[i] : false,
-				     msix_vec);
+
+		cfg->cfg_idx = i;
+		vqs[i] = vp_setup_vq(vdev, queue_idx++, cfg, msix_vec);
 		if (IS_ERR(vqs[i])) {
 			err = PTR_ERR(vqs[i]);
 			goto error_find;
@@ -343,7 +341,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
 		snprintf(vp_dev->msix_names[msix_vec],
 			 sizeof *vp_dev->msix_names,
 			 "%s-%s",
-			 dev_name(&vp_dev->vdev.dev), names[i]);
+			 dev_name(&vp_dev->vdev.dev), cfg->names[i]);
 		err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec),
 				  vring_interrupt, 0,
 				  vp_dev->msix_names[msix_vec],
@@ -358,11 +356,11 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
 	return err;
 }
 
-static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,
-		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], const bool *ctx)
+static int vp_find_vqs_intx(struct virtio_device *vdev, struct virtio_vq_config *cfg)
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+	struct virtqueue **vqs = cfg->vqs;
+	unsigned int nvqs = cfg->nvqs;
 	int i, err, queue_idx = 0;
 
 	vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
@@ -377,13 +375,13 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,
 	vp_dev->intx_enabled = 1;
 	vp_dev->per_vq_vectors = false;
 	for (i = 0; i < nvqs; ++i) {
-		if (!names[i]) {
+		if (!cfg->names[i]) {
 			vqs[i] = NULL;
 			continue;
 		}
-		vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
-				     ctx ? ctx[i] : false,
-				     VIRTIO_MSI_NO_VECTOR);
+
+		cfg->cfg_idx = i;
+		vqs[i] = vp_setup_vq(vdev, queue_idx++, cfg, VIRTIO_MSI_NO_VECTOR);
 		if (IS_ERR(vqs[i])) {
 			err = PTR_ERR(vqs[i]);
 			goto out_del_vqs;
@@ -397,26 +395,23 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,
 }
 
 /* the config->find_vqs() implementation */
-int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
-		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], const bool *ctx,
-		struct irq_affinity *desc)
+int vp_find_vqs(struct virtio_device *vdev, struct virtio_vq_config *cfg)
 {
 	int err;
 
 	/* Try MSI-X with one vector per queue. */
-	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc);
+	err = vp_find_vqs_msix(vdev, cfg, true);
 	if (!err)
 		return 0;
 	/* Fallback: MSI-X with one vector for config, one shared for queues. */
-	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc);
+	err = vp_find_vqs_msix(vdev, cfg, false);
 	if (!err)
 		return 0;
 	/* Is there an interrupt? If not give up. */
 	if (!(to_vp_device(vdev)->pci_dev->irq))
 		return err;
 	/* Finally fall back to regular interrupts. */
-	return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx);
+	return vp_find_vqs_intx(vdev, cfg);
 }
 
 const char *vp_bus_name(struct virtio_device *vdev)
diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h
index 7fef52bee455..5ba8b82fb765 100644
--- a/drivers/virtio/virtio_pci_common.h
+++ b/drivers/virtio/virtio_pci_common.h
@@ -95,9 +95,7 @@ struct virtio_pci_device {
 	struct virtqueue *(*setup_vq)(struct virtio_pci_device *vp_dev,
 				      struct virtio_pci_vq_info *info,
 				      unsigned int idx,
-				      void (*callback)(struct virtqueue *vq),
-				      const char *name,
-				      bool ctx,
+				      struct virtio_vq_config *vq_cfg,
 				      u16 msix_vec);
 	void (*del_vq)(struct virtio_pci_vq_info *info);
 
@@ -126,10 +124,7 @@ bool vp_notify(struct virtqueue *vq);
 /* the config->del_vqs() implementation */
 void vp_del_vqs(struct virtio_device *vdev);
 /* the config->find_vqs() implementation */
-int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
-		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], const bool *ctx,
-		struct irq_affinity *desc);
+int vp_find_vqs(struct virtio_device *vdev, struct virtio_vq_config *cfg);
 const char *vp_bus_name(struct virtio_device *vdev);
 
 /* Setup the affinity for a virtqueue:
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index d9cbb02b35a1..e8d22fce32f5 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -110,9 +110,7 @@ static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
 static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 				  struct virtio_pci_vq_info *info,
 				  unsigned int index,
-				  void (*callback)(struct virtqueue *vq),
-				  const char *name,
-				  bool ctx,
+				  struct virtio_vq_config *cfg,
 				  u16 msix_vec)
 {
 	struct virtqueue *vq;
@@ -130,8 +128,11 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 	/* create the vring */
 	vq = vring_create_virtqueue(index, num,
 				    VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
-				    true, false, ctx,
-				    vp_notify, callback, name);
+				    true, false,
+				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
+				    vp_notify,
+				    cfg->callbacks[cfg->cfg_idx],
+				    cfg->names[cfg->cfg_idx]);
 	if (!vq)
 		return ERR_PTR(-ENOMEM);
 
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index f62b530aa3b5..b2cdf5d3824d 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -530,9 +530,7 @@ static bool vp_notify_with_data(struct virtqueue *vq)
 static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 				  struct virtio_pci_vq_info *info,
 				  unsigned int index,
-				  void (*callback)(struct virtqueue *vq),
-				  const char *name,
-				  bool ctx,
+				  struct virtio_vq_config *cfg,
 				  u16 msix_vec)
 {
 
@@ -563,8 +561,11 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 	/* create the vring */
 	vq = vring_create_virtqueue(index, num,
 				    SMP_CACHE_BYTES, &vp_dev->vdev,
-				    true, true, ctx,
-				    notify, callback, name);
+				    true, true,
+				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
+				    notify,
+				    cfg->callbacks[cfg->cfg_idx],
+				    cfg->names[cfg->cfg_idx]);
 	if (!vq)
 		return ERR_PTR(-ENOMEM);
 
@@ -593,15 +594,11 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 	return ERR_PTR(err);
 }
 
-static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
-			      struct virtqueue *vqs[],
-			      vq_callback_t *callbacks[],
-			      const char * const names[], const bool *ctx,
-			      struct irq_affinity *desc)
+static int vp_modern_find_vqs(struct virtio_device *vdev, struct virtio_vq_config *cfg)
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
 	struct virtqueue *vq;
-	int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, ctx, desc);
+	int rc = vp_find_vqs(vdev, cfg);
 
 	if (rc)
 		return rc;
@@ -739,10 +736,17 @@ static bool vp_get_shm_region(struct virtio_device *vdev,
 static int vp_modern_create_avq(struct virtio_device *vdev)
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+	vq_callback_t *callbacks[] = { NULL };
+	struct virtio_vq_config cfg = {};
 	struct virtio_pci_admin_vq *avq;
 	struct virtqueue *vq;
+	const char *names[1];
 	u16 admin_q_num;
 
+	cfg.nvqs = 1;
+	cfg.callbacks = callbacks;
+	cfg.names = names;
+
 	if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
 		return 0;
 
@@ -753,8 +757,11 @@ static int vp_modern_create_avq(struct virtio_device *vdev)
 	avq = &vp_dev->admin_vq;
 	avq->vq_index = vp_modern_avq_index(&vp_dev->mdev);
 	sprintf(avq->name, "avq.%u", avq->vq_index);
-	vq = vp_dev->setup_vq(vp_dev, &vp_dev->admin_vq.info, avq->vq_index, NULL,
-			      avq->name, NULL, VIRTIO_MSI_NO_VECTOR);
+
+	cfg.names[0] = avq->name;
+	cfg.cfg_idx = 0;
+	vq = vp_dev->setup_vq(vp_dev, &vp_dev->admin_vq.info, avq->vq_index,
+			      &cfg, VIRTIO_MSI_NO_VECTOR);
 	if (IS_ERR(vq)) {
 		dev_err(&vdev->dev, "failed to setup admin virtqueue, err=%ld",
 			PTR_ERR(vq));
diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index e803db0da307..7f3e173f669c 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -142,8 +142,7 @@ static irqreturn_t virtio_vdpa_virtqueue_cb(void *private)
 
 static struct virtqueue *
 virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
-		     void (*callback)(struct virtqueue *vq),
-		     const char *name, bool ctx)
+		     struct virtio_vq_config *cfg)
 {
 	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
@@ -161,7 +160,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 	bool may_reduce_num = true;
 	int err;
 
-	if (!name)
+	if (!cfg->names[cfg->cfg_idx])
 		return NULL;
 
 	if (index >= vdpa->nvqs)
@@ -206,8 +205,12 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 	else
 		dma_dev = vdpa_get_dma_dev(vdpa);
 	vq = vring_create_virtqueue_dma(index, max_num, align, vdev,
-					true, may_reduce_num, ctx,
-					notify, callback, name, dma_dev);
+					true, may_reduce_num,
+					cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
+					notify,
+					cfg->callbacks[cfg->cfg_idx],
+					cfg->names[cfg->cfg_idx],
+					dma_dev);
 	if (!vq) {
 		err = -ENOMEM;
 		goto error_new_virtqueue;
@@ -216,7 +219,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 	vq->num_max = max_num;
 
 	/* Setup virtqueue callback */
-	cb.callback = callback ? virtio_vdpa_virtqueue_cb : NULL;
+	cb.callback = cfg->callbacks[cfg->cfg_idx] ? virtio_vdpa_virtqueue_cb : NULL;
 	cb.private = info;
 	cb.trigger = NULL;
 	ops->set_vq_cb(vdpa, index, &cb);
@@ -356,12 +359,8 @@ create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd)
 	return masks;
 }
 
-static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
-				struct virtqueue *vqs[],
-				vq_callback_t *callbacks[],
-				const char * const names[],
-				const bool *ctx,
-				struct irq_affinity *desc)
+static int virtio_vdpa_find_vqs(struct virtio_device *vdev,
+				struct virtio_vq_config *cfg)
 {
 	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
@@ -369,24 +368,25 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 	struct irq_affinity default_affd = { 0 };
 	struct cpumask *masks;
 	struct vdpa_callback cb;
-	bool has_affinity = desc && ops->set_vq_affinity;
+	bool has_affinity = cfg->desc && ops->set_vq_affinity;
+	struct virtqueue **vqs = cfg->vqs;
+	unsigned int nvqs = cfg->nvqs;
 	int i, err, queue_idx = 0;
 
 	if (has_affinity) {
-		masks = create_affinity_masks(nvqs, desc ? desc : &default_affd);
+		masks = create_affinity_masks(nvqs, cfg->desc ? cfg->desc : &default_affd);
 		if (!masks)
 			return -ENOMEM;
 	}
 
 	for (i = 0; i < nvqs; ++i) {
-		if (!names[i]) {
+		if (!cfg->names[i]) {
 			vqs[i] = NULL;
 			continue;
 		}
 
-		vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++,
-					      callbacks[i], names[i], ctx ?
-					      ctx[i] : false);
+		cfg->cfg_idx = i;
+		vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++, cfg);
 		if (IS_ERR(vqs[i])) {
 			err = PTR_ERR(vqs[i]);
 			goto err_setup_vq;
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index da9b271b54db..1df8634d1258 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -96,6 +96,20 @@ typedef void vq_callback_t(struct virtqueue *);
  * @create_avq: create admin virtqueue resource.
  * @destroy_avq: destroy admin virtqueue resource.
  */
+
+struct virtio_vq_config {
+	unsigned int nvqs;
+
+	/* the vq index may not eq to the cfg index of the other array items */
+	unsigned int cfg_idx;
+
+	struct virtqueue **vqs;
+	vq_callback_t **callbacks;
+	const char *const *names;
+	const bool *ctx;
+	struct irq_affinity *desc;
+};
+
 struct virtio_config_ops {
 	void (*get)(struct virtio_device *vdev, unsigned offset,
 		    void *buf, unsigned len);
@@ -105,10 +119,7 @@ struct virtio_config_ops {
 	u8 (*get_status)(struct virtio_device *vdev);
 	void (*set_status)(struct virtio_device *vdev, u8 status);
 	void (*reset)(struct virtio_device *vdev);
-	int (*find_vqs)(struct virtio_device *, unsigned nvqs,
-			struct virtqueue *vqs[], vq_callback_t *callbacks[],
-			const char * const names[], const bool *ctx,
-			struct irq_affinity *desc);
+	int (*find_vqs)(struct virtio_device *vdev, struct virtio_vq_config *cfg);
 	void (*del_vqs)(struct virtio_device *);
 	void (*synchronize_cbs)(struct virtio_device *);
 	u64 (*get_features)(struct virtio_device *vdev);
@@ -217,8 +228,14 @@ struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
 	vq_callback_t *callbacks[] = { c };
 	const char *names[] = { n };
 	struct virtqueue *vq;
-	int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names, NULL,
-					 NULL);
+	struct virtio_vq_config cfg = {};
+
+	cfg.nvqs = 1;
+	cfg.vqs = &vq;
+	cfg.callbacks = callbacks;
+	cfg.names = names;
+
+	int err = vdev->config->find_vqs(vdev, &cfg);
 	if (err < 0)
 		return ERR_PTR(err);
 	return vq;
@@ -230,7 +247,15 @@ int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 			const char * const names[],
 			struct irq_affinity *desc)
 {
-	return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, NULL, desc);
+	struct virtio_vq_config cfg = {};
+
+	cfg.nvqs = nvqs;
+	cfg.vqs = vqs;
+	cfg.callbacks = callbacks;
+	cfg.names = names;
+	cfg.desc = desc;
+
+	return vdev->config->find_vqs(vdev, &cfg);
 }
 
 static inline
@@ -239,8 +264,16 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
 			const char * const names[], const bool *ctx,
 			struct irq_affinity *desc)
 {
-	return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, ctx,
-				      desc);
+	struct virtio_vq_config cfg = {};
+
+	cfg.nvqs = nvqs;
+	cfg.vqs = vqs;
+	cfg.callbacks = callbacks;
+	cfg.names = names;
+	cfg.ctx = ctx;
+	cfg.desc = desc;
+
+	return vdev->config->find_vqs(vdev, &cfg);
 }
 
 /**
-- 
2.32.0.3.g01195cf9f

Re: [PATCH vhost 1/4] virtio: find_vqs: pass struct instead of multi parameters

[Johannes Berg]

On Mon, 2024-03-04 at 19:47 +0800, Xuan Zhuo wrote:
> Now, we pass multi parameters to find_vqs. These parameters
> may work for transport or work for vring.
> 
> And find_vqs has multi implements in many places:
> 
>  arch/um/drivers/virtio_uml.c

That part looks fine to me.

Acked-by: Johannes Berg <johannes@sipsolutions.net>

johannes

Re: [PATCH vhost 1/4] virtio: find_vqs: pass struct instead of multi parameters

[Ilpo Järvinen]

On Mon, 4 Mar 2024, Xuan Zhuo wrote:

> Now, we pass multi parameters to find_vqs. These parameters
> may work for transport or work for vring.
> 
> And find_vqs has multi implements in many places:
> 
>  arch/um/drivers/virtio_uml.c
>  drivers/platform/mellanox/mlxbf-tmfifo.c
>  drivers/remoteproc/remoteproc_virtio.c
>  drivers/s390/virtio/virtio_ccw.c
>  drivers/virtio/virtio_mmio.c
>  drivers/virtio/virtio_pci_legacy.c
>  drivers/virtio/virtio_pci_modern.c
>  drivers/virtio/virtio_vdpa.c
> 
> Every time, we try to add a new parameter, that is difficult.
> We must change every find_vqs implement.
> 
> One the other side, if we want to pass a parameter to vring,
> we must change the call path from transport to vring.
> Too many functions need to be changed.
> 
> So it is time to refactor the find_vqs. We pass a structure
> cfg to find_vqs(), that will be passed to vring by transport.
> 
> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> ---
>  arch/um/drivers/virtio_uml.c             | 23 ++++-----
>  drivers/platform/mellanox/mlxbf-tmfifo.c | 13 ++----
>  drivers/remoteproc/remoteproc_virtio.c   | 28 ++++++-----
>  drivers/s390/virtio/virtio_ccw.c         | 29 ++++++------
>  drivers/virtio/virtio_mmio.c             | 26 +++++------
>  drivers/virtio/virtio_pci_common.c       | 59 +++++++++++-------------
>  drivers/virtio/virtio_pci_common.h       |  9 +---
>  drivers/virtio/virtio_pci_legacy.c       | 11 +++--
>  drivers/virtio/virtio_pci_modern.c       | 33 +++++++------
>  drivers/virtio/virtio_vdpa.c             | 36 +++++++--------
>  include/linux/virtio_config.h            | 51 ++++++++++++++++----
>  11 files changed, 172 insertions(+), 146 deletions(-)
> 
> diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
> index 8adca2000e51..c13dfeeb90c4 100644
> --- a/arch/um/drivers/virtio_uml.c
> +++ b/arch/um/drivers/virtio_uml.c
> @@ -937,8 +937,8 @@ static int vu_setup_vq_call_fd(struct virtio_uml_device *vu_dev,
>  }
>  
>  static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
> -				     unsigned index, vq_callback_t *callback,
> -				     const char *name, bool ctx)
> +				     unsigned index,
> +				     struct virtio_vq_config *cfg)
>  {
>  	struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
>  	struct platform_device *pdev = vu_dev->pdev;
> @@ -953,10 +953,12 @@ static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
>  		goto error_kzalloc;
>  	}
>  	snprintf(info->name, sizeof(info->name), "%s.%d-%s", pdev->name,
> -		 pdev->id, name);
> +		 pdev->id, cfg->names[cfg->cfg_idx]);
>  
>  	vq = vring_create_virtqueue(index, num, PAGE_SIZE, vdev, true, true,
> -				    ctx, vu_notify, callback, info->name);
> +				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,

Based on the commit message, I don't understand why this transformation 
was made. It's perhaps some artifact of moving things around but please 
state it in the commit message because this isn't 1:1 transformation 
which would be just ctx -> cfg->ctx

> +				    vu_notify,
> +				    cfg->callbacks[cfg->cfg_idx], info->name);
>  	if (!vq) {
>  		rc = -ENOMEM;
>  		goto error_create;


> diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
> index b655fccaf773..a9ae03904dcf 100644
> --- a/drivers/virtio/virtio_pci_common.c
> +++ b/drivers/virtio/virtio_pci_common.c
> @@ -172,9 +172,7 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
>  }
>  
>  static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int index,
> -				     void (*callback)(struct virtqueue *vq),
> -				     const char *name,
> -				     bool ctx,
> +				     struct virtio_vq_config *cfg,
>  				     u16 msix_vec)
>  {
>  	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
> @@ -186,13 +184,13 @@ static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int in
>  	if (!info)
>  		return ERR_PTR(-ENOMEM);
>  
> -	vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx,
> +	vq = vp_dev->setup_vq(vp_dev, info, index, cfg,
>  			      msix_vec);

Should now easily fit to one line.


> @@ -126,10 +124,7 @@ bool vp_notify(struct virtqueue *vq);
>  /* the config->del_vqs() implementation */
>  void vp_del_vqs(struct virtio_device *vdev);
>  /* the config->find_vqs() implementation */
> -int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
> -		struct virtqueue *vqs[], vq_callback_t *callbacks[],
> -		const char * const names[], const bool *ctx,
> -		struct irq_affinity *desc);
> +int vp_find_vqs(struct virtio_device *vdev, struct virtio_vq_config *cfg);

Without knowing better, do you expect cfg is mutated inside vp_find_vqs()? 
If not, mark it as const.

> diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> index da9b271b54db..1df8634d1258 100644
> --- a/include/linux/virtio_config.h
> +++ b/include/linux/virtio_config.h
> @@ -96,6 +96,20 @@ typedef void vq_callback_t(struct virtqueue *);
>   * @create_avq: create admin virtqueue resource.
>   * @destroy_avq: destroy admin virtqueue resource.
>   */
> +
> +struct virtio_vq_config {
> +	unsigned int nvqs;
> +
> +	/* the vq index may not eq to the cfg index of the other array items */

Can you try to make this comment clearer, as is I don't understand what it 
means. E.g. what is "the other array"? not eq = not equal ?

> +	unsigned int cfg_idx;
> +
> +	struct virtqueue **vqs;
> +	vq_callback_t **callbacks;
> +	const char *const *names;
> +	const bool *ctx;
> +	struct irq_affinity *desc;
> +};

The placement of the struct is wrong. Now the documentation of struct 
virtio_config_ops is above your struct!?!

Please also document the members of the newly added struct with kerneldoc.

> +
>  struct virtio_config_ops {
>  	void (*get)(struct virtio_device *vdev, unsigned offset,
>  		    void *buf, unsigned len);
> @@ -105,10 +119,7 @@ struct virtio_config_ops {
>  	u8 (*get_status)(struct virtio_device *vdev);
>  	void (*set_status)(struct virtio_device *vdev, u8 status);
>  	void (*reset)(struct virtio_device *vdev);
> -	int (*find_vqs)(struct virtio_device *, unsigned nvqs,
> -			struct virtqueue *vqs[], vq_callback_t *callbacks[],
> -			const char * const names[], const bool *ctx,
> -			struct irq_affinity *desc);
> +	int (*find_vqs)(struct virtio_device *vdev, struct virtio_vq_config *cfg);
>  	void (*del_vqs)(struct virtio_device *);
>  	void (*synchronize_cbs)(struct virtio_device *);
>  	u64 (*get_features)(struct virtio_device *vdev);


-- 
 i.

Re: [PATCH vhost 1/4] virtio: find_vqs: pass struct instead of multi parameters

[Xuan Zhuo]

On Tue, 5 Mar 2024 13:23:25 +0200 (EET), =?utf-8?q?Ilpo_J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com> wrote:
> On Mon, 4 Mar 2024, Xuan Zhuo wrote:
>
> > Now, we pass multi parameters to find_vqs. These parameters
> > may work for transport or work for vring.
> >
> > And find_vqs has multi implements in many places:
> >
> >  arch/um/drivers/virtio_uml.c
> >  drivers/platform/mellanox/mlxbf-tmfifo.c
> >  drivers/remoteproc/remoteproc_virtio.c
> >  drivers/s390/virtio/virtio_ccw.c
> >  drivers/virtio/virtio_mmio.c
> >  drivers/virtio/virtio_pci_legacy.c
> >  drivers/virtio/virtio_pci_modern.c
> >  drivers/virtio/virtio_vdpa.c
> >
> > Every time, we try to add a new parameter, that is difficult.
> > We must change every find_vqs implement.
> >
> > One the other side, if we want to pass a parameter to vring,
> > we must change the call path from transport to vring.
> > Too many functions need to be changed.
> >
> > So it is time to refactor the find_vqs. We pass a structure
> > cfg to find_vqs(), that will be passed to vring by transport.
> >
> > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> > ---
> >  arch/um/drivers/virtio_uml.c             | 23 ++++-----
> >  drivers/platform/mellanox/mlxbf-tmfifo.c | 13 ++----
> >  drivers/remoteproc/remoteproc_virtio.c   | 28 ++++++-----
> >  drivers/s390/virtio/virtio_ccw.c         | 29 ++++++------
> >  drivers/virtio/virtio_mmio.c             | 26 +++++------
> >  drivers/virtio/virtio_pci_common.c       | 59 +++++++++++-------------
> >  drivers/virtio/virtio_pci_common.h       |  9 +---
> >  drivers/virtio/virtio_pci_legacy.c       | 11 +++--
> >  drivers/virtio/virtio_pci_modern.c       | 33 +++++++------
> >  drivers/virtio/virtio_vdpa.c             | 36 +++++++--------
> >  include/linux/virtio_config.h            | 51 ++++++++++++++++----
> >  11 files changed, 172 insertions(+), 146 deletions(-)
> >
> > diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
> > index 8adca2000e51..c13dfeeb90c4 100644
> > --- a/arch/um/drivers/virtio_uml.c
> > +++ b/arch/um/drivers/virtio_uml.c
> > @@ -937,8 +937,8 @@ static int vu_setup_vq_call_fd(struct virtio_uml_device *vu_dev,
> >  }
> >
> >  static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
> > -				     unsigned index, vq_callback_t *callback,
> > -				     const char *name, bool ctx)
> > +				     unsigned index,
> > +				     struct virtio_vq_config *cfg)
> >  {
> >  	struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
> >  	struct platform_device *pdev = vu_dev->pdev;
> > @@ -953,10 +953,12 @@ static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
> >  		goto error_kzalloc;
> >  	}
> >  	snprintf(info->name, sizeof(info->name), "%s.%d-%s", pdev->name,
> > -		 pdev->id, name);
> > +		 pdev->id, cfg->names[cfg->cfg_idx]);
> >
> >  	vq = vring_create_virtqueue(index, num, PAGE_SIZE, vdev, true, true,
> > -				    ctx, vu_notify, callback, info->name);
> > +				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
>
> Based on the commit message, I don't understand why this transformation
> was made. It's perhaps some artifact of moving things around but please
> state it in the commit message because this isn't 1:1 transformation
> which would be just ctx -> cfg->ctx

You can see the caller:

	ctx ? ctx[i] : false

ctx maybe array or null.
vring_create_virtqueue just accept the bool. So we pass the cfg->ctx[cfg->
cfg_idx] if it is array.

>
> > +				    vu_notify,
> > +				    cfg->callbacks[cfg->cfg_idx], info->name);
> >  	if (!vq) {
> >  		rc = -ENOMEM;
> >  		goto error_create;
>
>
> > diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
> > index b655fccaf773..a9ae03904dcf 100644
> > --- a/drivers/virtio/virtio_pci_common.c
> > +++ b/drivers/virtio/virtio_pci_common.c
> > @@ -172,9 +172,7 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
> >  }
> >
> >  static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int index,
> > -				     void (*callback)(struct virtqueue *vq),
> > -				     const char *name,
> > -				     bool ctx,
> > +				     struct virtio_vq_config *cfg,
> >  				     u16 msix_vec)
> >  {
> >  	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
> > @@ -186,13 +184,13 @@ static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int in
> >  	if (!info)
> >  		return ERR_PTR(-ENOMEM);
> >
> > -	vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx,
> > +	vq = vp_dev->setup_vq(vp_dev, info, index, cfg,
> >  			      msix_vec);
>
> Should now easily fit to one line.

YES.


>
>
> > @@ -126,10 +124,7 @@ bool vp_notify(struct virtqueue *vq);
> >  /* the config->del_vqs() implementation */
> >  void vp_del_vqs(struct virtio_device *vdev);
> >  /* the config->find_vqs() implementation */
> > -int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
> > -		struct virtqueue *vqs[], vq_callback_t *callbacks[],
> > -		const char * const names[], const bool *ctx,
> > -		struct irq_affinity *desc);
> > +int vp_find_vqs(struct virtio_device *vdev, struct virtio_vq_config *cfg);
>
> Without knowing better, do you expect cfg is mutated inside vp_find_vqs()?
> If not, mark it as const.

It can be changed.

cfg_idx will be updated.


>
> > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> > index da9b271b54db..1df8634d1258 100644
> > --- a/include/linux/virtio_config.h
> > +++ b/include/linux/virtio_config.h
> > @@ -96,6 +96,20 @@ typedef void vq_callback_t(struct virtqueue *);
> >   * @create_avq: create admin virtqueue resource.
> >   * @destroy_avq: destroy admin virtqueue resource.
> >   */
> > +
> > +struct virtio_vq_config {
> > +	unsigned int nvqs;
> > +
> > +	/* the vq index may not eq to the cfg index of the other array items */
>
> Can you try to make this comment clearer, as is I don't understand what it
> means. E.g. what is "the other array"? not eq = not equal ?

The names, ctx, callbacks are array.

In the process of vq setup, we need to know the current index.
But we can not use the vq->index, because maybe the one of names
is null, so we must record the current index.

The comment will be updated.

>
> > +	unsigned int cfg_idx;
> > +
> > +	struct virtqueue **vqs;
> > +	vq_callback_t **callbacks;
> > +	const char *const *names;
> > +	const bool *ctx;
> > +	struct irq_affinity *desc;
> > +};
>
> The placement of the struct is wrong. Now the documentation of struct
> virtio_config_ops is above your struct!?!
>
> Please also document the members of the newly added struct with kerneldoc.

Will fix.

Thanks.


>
> > +
> >  struct virtio_config_ops {
> >  	void (*get)(struct virtio_device *vdev, unsigned offset,
> >  		    void *buf, unsigned len);
> > @@ -105,10 +119,7 @@ struct virtio_config_ops {
> >  	u8 (*get_status)(struct virtio_device *vdev);
> >  	void (*set_status)(struct virtio_device *vdev, u8 status);
> >  	void (*reset)(struct virtio_device *vdev);
> > -	int (*find_vqs)(struct virtio_device *, unsigned nvqs,
> > -			struct virtqueue *vqs[], vq_callback_t *callbacks[],
> > -			const char * const names[], const bool *ctx,
> > -			struct irq_affinity *desc);
> > +	int (*find_vqs)(struct virtio_device *vdev, struct virtio_vq_config *cfg);
> >  	void (*del_vqs)(struct virtio_device *);
> >  	void (*synchronize_cbs)(struct virtio_device *);
> >  	u64 (*get_features)(struct virtio_device *vdev);
>
>
> --
>  i.
>

[PATCH vhost 2/4] virtio: vring_create_virtqueue: pass struct instead of multi parameters

[Xuan Zhuo]

Now, we pass multi parameters to vring_create_virtqueue. These parameters
may from transport or from driver.

vring_create_virtqueue is called by many places.
Every time, we try to add a new parameter, that is difficult.

If parameters from the driver, that should directly be passed to vring.
Then the vring can access the config from driver directly.

If parameters from the transport, we squish the parameters to a
structure. That will be helpful to add new parameter.

Because the virtio_uml.c changes the name, so change the "names" inside
the virtio_vq_config from "const char *const *names" to
"const char **names".

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 arch/um/drivers/virtio_uml.c       | 14 +++++---
 drivers/s390/virtio/virtio_ccw.c   | 14 ++++----
 drivers/virtio/virtio_mmio.c       | 14 ++++----
 drivers/virtio/virtio_pci_legacy.c | 15 ++++----
 drivers/virtio/virtio_pci_modern.c | 15 ++++----
 drivers/virtio/virtio_ring.c       | 57 ++++++++++++------------------
 drivers/virtio/virtio_vdpa.c       | 21 +++++------
 include/linux/virtio_config.h      |  6 ++--
 include/linux/virtio_ring.h        | 40 ++++++++-------------
 9 files changed, 93 insertions(+), 103 deletions(-)

diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index c13dfeeb90c4..1c2d59d3d02b 100644
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -942,6 +942,7 @@ static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
 {
 	struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
 	struct platform_device *pdev = vu_dev->pdev;
+	struct vq_transport_config tp_cfg = {};
 	struct virtio_uml_vq_info *info;
 	struct virtqueue *vq;
 	int num = MAX_SUPPORTED_QUEUE_SIZE;
@@ -955,10 +956,15 @@ static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
 	snprintf(info->name, sizeof(info->name), "%s.%d-%s", pdev->name,
 		 pdev->id, cfg->names[cfg->cfg_idx]);
 
-	vq = vring_create_virtqueue(index, num, PAGE_SIZE, vdev, true, true,
-				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
-				    vu_notify,
-				    cfg->callbacks[cfg->cfg_idx], info->name);
+	tp_cfg.num = num;
+	tp_cfg.vring_align = PAGE_SIZE;
+	tp_cfg.weak_barriers = true;
+	tp_cfg.may_reduce_num = true;
+	tp_cfg.notify = vu_notify;
+
+	cfg->names[cfg->cfg_idx] = info->name;
+
+	vq = vring_create_virtqueue(vdev, index, &tp_cfg, cfg);
 	if (!vq) {
 		rc = -ENOMEM;
 		goto error_create;
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 11eea5086cff..f8d5bbd13359 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -503,6 +503,7 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
 					     struct virtio_vq_config *cfg)
 {
 	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
+	struct vq_transport_config tp_cfg = {};
 	bool (*notify)(struct virtqueue *vq);
 	int err;
 	struct virtqueue *vq = NULL;
@@ -536,13 +537,14 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
 		goto out_err;
 	}
 	may_reduce = vcdev->revision > 0;
-	vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN,
-				    vdev, true, may_reduce,
-				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
-				    notify,
-				    cfg->callbacks[cfg->cfg_idx],
-				    cfg->names[cfg->cfg_idx]);
 
+	tp_cfg.num = info->num;
+	tp_cfg.vring_align = KVM_VIRTIO_CCW_RING_ALIGN;
+	tp_cfg.weak_barriers = true;
+	tp_cfg.may_reduce_num = may_reduce;
+	tp_cfg.notify = notify;
+
+	vq = vring_create_virtqueue(vdev, i, &tp_cfg, cfg);
 	if (!vq) {
 		/* For now, we fail if we can't get the requested size. */
 		dev_warn(&vcdev->cdev->dev, "no vq\n");
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index feb823d279d2..cb172fa4d7cc 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -373,6 +373,7 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
 				     struct virtio_vq_config *cfg)
 {
 	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
+	struct vq_transport_config tp_cfg = {};
 	bool (*notify)(struct virtqueue *vq);
 	struct virtio_mmio_vq_info *info;
 	struct virtqueue *vq;
@@ -411,13 +412,14 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
 		goto error_new_virtqueue;
 	}
 
+	tp_cfg.num = num;
+	tp_cfg.vring_align = VIRTIO_MMIO_VRING_ALIGN;
+	tp_cfg.weak_barriers = true;
+	tp_cfg.may_reduce_num = true;
+	tp_cfg.notify = notify;
+
 	/* Create the vring */
-	vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev,
-				 true, true,
-				 cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
-				 notify,
-				 cfg->callbacks[cfg->cfg_idx],
-				 cfg->names[cfg->cfg_idx]);
+	vq = vring_create_virtqueue(vdev, index, &tp_cfg, cfg);
 	if (!vq) {
 		err = -ENOMEM;
 		goto error_new_virtqueue;
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index e8d22fce32f5..6fe675b2a5e5 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -113,6 +113,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 				  struct virtio_vq_config *cfg,
 				  u16 msix_vec)
 {
+	struct vq_transport_config tp_cfg = {};
 	struct virtqueue *vq;
 	u16 num;
 	int err;
@@ -125,14 +126,14 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 
 	info->msix_vector = msix_vec;
 
+	tp_cfg.num = num;
+	tp_cfg.vring_align = VIRTIO_PCI_VRING_ALIGN;
+	tp_cfg.weak_barriers = true;
+	tp_cfg.may_reduce_num = false;
+	tp_cfg.notify = vp_notify;
+
 	/* create the vring */
-	vq = vring_create_virtqueue(index, num,
-				    VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
-				    true, false,
-				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
-				    vp_notify,
-				    cfg->callbacks[cfg->cfg_idx],
-				    cfg->names[cfg->cfg_idx]);
+	vq = vring_create_virtqueue(&vp_dev->vdev, index, &tp_cfg, cfg);
 	if (!vq)
 		return ERR_PTR(-ENOMEM);
 
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index b2cdf5d3824d..dd75534346d1 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -535,6 +535,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 {
 
 	struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+	struct vq_transport_config tp_cfg = {};
 	bool (*notify)(struct virtqueue *vq);
 	struct virtqueue *vq;
 	bool is_avq;
@@ -558,14 +559,14 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 
 	info->msix_vector = msix_vec;
 
+	tp_cfg.num = num;
+	tp_cfg.vring_align = SMP_CACHE_BYTES;
+	tp_cfg.weak_barriers = true;
+	tp_cfg.may_reduce_num = true;
+	tp_cfg.notify = notify;
+
 	/* create the vring */
-	vq = vring_create_virtqueue(index, num,
-				    SMP_CACHE_BYTES, &vp_dev->vdev,
-				    true, true,
-				    cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
-				    notify,
-				    cfg->callbacks[cfg->cfg_idx],
-				    cfg->names[cfg->cfg_idx]);
+	vq = vring_create_virtqueue(&vp_dev->vdev, index, &tp_cfg, cfg);
 	if (!vq)
 		return ERR_PTR(-ENOMEM);
 
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 6f7e5010a673..08858e2d761e 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2662,43 +2662,32 @@ static struct virtqueue *__vring_new_virtqueue(unsigned int index,
 	return &vq->vq;
 }
 
-struct virtqueue *vring_create_virtqueue(
-	unsigned int index,
-	unsigned int num,
-	unsigned int vring_align,
-	struct virtio_device *vdev,
-	bool weak_barriers,
-	bool may_reduce_num,
-	bool context,
-	bool (*notify)(struct virtqueue *),
-	void (*callback)(struct virtqueue *),
-	const char *name)
+struct virtqueue *vring_create_virtqueue(struct virtio_device *vdev,
+					 unsigned int index,
+					 struct vq_transport_config *tp_cfg,
+					 struct virtio_vq_config *cfg)
 {
+	struct device *dma_dev;
+	unsigned int num;
+	unsigned int vring_align;
+	bool weak_barriers;
+	bool may_reduce_num;
+	bool context;
+	bool (*notify)(struct virtqueue *_);
+	void (*callback)(struct virtqueue *_);
+	const char *name;
 
-	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
-		return vring_create_virtqueue_packed(index, num, vring_align,
-				vdev, weak_barriers, may_reduce_num,
-				context, notify, callback, name, vdev->dev.parent);
+	dma_dev = tp_cfg->dma_dev ? : vdev->dev.parent;
 
-	return vring_create_virtqueue_split(index, num, vring_align,
-			vdev, weak_barriers, may_reduce_num,
-			context, notify, callback, name, vdev->dev.parent);
-}
-EXPORT_SYMBOL_GPL(vring_create_virtqueue);
+	num            = tp_cfg->num;
+	vring_align    = tp_cfg->vring_align;
+	weak_barriers  = tp_cfg->weak_barriers;
+	may_reduce_num = tp_cfg->may_reduce_num;
+	notify         = tp_cfg->notify;
 
-struct virtqueue *vring_create_virtqueue_dma(
-	unsigned int index,
-	unsigned int num,
-	unsigned int vring_align,
-	struct virtio_device *vdev,
-	bool weak_barriers,
-	bool may_reduce_num,
-	bool context,
-	bool (*notify)(struct virtqueue *),
-	void (*callback)(struct virtqueue *),
-	const char *name,
-	struct device *dma_dev)
-{
+	name     = cfg->names[cfg->cfg_idx];
+	callback = cfg->callbacks[cfg->cfg_idx];
+	context  = cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false;
 
 	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
 		return vring_create_virtqueue_packed(index, num, vring_align,
@@ -2709,7 +2698,7 @@ struct virtqueue *vring_create_virtqueue_dma(
 			vdev, weak_barriers, may_reduce_num,
 			context, notify, callback, name, dma_dev);
 }
-EXPORT_SYMBOL_GPL(vring_create_virtqueue_dma);
+EXPORT_SYMBOL_GPL(vring_create_virtqueue);
 
 /**
  * virtqueue_resize - resize the vring of vq
diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index 7f3e173f669c..1ab219fce653 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -146,8 +146,8 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 {
 	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
-	struct device *dma_dev;
 	const struct vdpa_config_ops *ops = vdpa->config;
+	struct vq_transport_config tp_cfg = {};
 	struct virtio_vdpa_vq_info *info;
 	bool (*notify)(struct virtqueue *vq) = virtio_vdpa_notify;
 	struct vdpa_callback cb;
@@ -201,16 +201,17 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 	align = ops->get_vq_align(vdpa);
 
 	if (ops->get_vq_dma_dev)
-		dma_dev = ops->get_vq_dma_dev(vdpa, index);
+		tp_cfg.dma_dev = ops->get_vq_dma_dev(vdpa, index);
 	else
-		dma_dev = vdpa_get_dma_dev(vdpa);
-	vq = vring_create_virtqueue_dma(index, max_num, align, vdev,
-					true, may_reduce_num,
-					cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
-					notify,
-					cfg->callbacks[cfg->cfg_idx],
-					cfg->names[cfg->cfg_idx],
-					dma_dev);
+		tp_cfg.dma_dev = vdpa_get_dma_dev(vdpa);
+
+	tp_cfg.num = max_num;
+	tp_cfg.vring_align = align;
+	tp_cfg.weak_barriers = true;
+	tp_cfg.may_reduce_num = may_reduce_num;
+	tp_cfg.notify = notify;
+
+	vq = vring_create_virtqueue(vdev, index, &tp_cfg, cfg);
 	if (!vq) {
 		err = -ENOMEM;
 		goto error_new_virtqueue;
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 1df8634d1258..d47188303d34 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -105,7 +105,7 @@ struct virtio_vq_config {
 
 	struct virtqueue **vqs;
 	vq_callback_t **callbacks;
-	const char *const *names;
+	const char **names;
 	const bool *ctx;
 	struct irq_affinity *desc;
 };
@@ -252,7 +252,7 @@ int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 	cfg.nvqs = nvqs;
 	cfg.vqs = vqs;
 	cfg.callbacks = callbacks;
-	cfg.names = names;
+	cfg.names = (const char **)names;
 	cfg.desc = desc;
 
 	return vdev->config->find_vqs(vdev, &cfg);
@@ -269,7 +269,7 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
 	cfg.nvqs = nvqs;
 	cfg.vqs = vqs;
 	cfg.callbacks = callbacks;
-	cfg.names = names;
+	cfg.names = (const char **)names;
 	cfg.ctx = ctx;
 	cfg.desc = desc;
 
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index 9b33df741b63..cd8042c79814 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -5,6 +5,7 @@
 #include <asm/barrier.h>
 #include <linux/irqreturn.h>
 #include <uapi/linux/virtio_ring.h>
+#include <linux/virtio_config.h>
 
 /*
  * Barriers in virtio are tricky.  Non-SMP virtio guests can't assume
@@ -60,38 +61,25 @@ struct virtio_device;
 struct virtqueue;
 struct device;
 
+struct vq_transport_config {
+	unsigned int num;
+	unsigned int vring_align;
+	bool weak_barriers;
+	bool may_reduce_num;
+	bool (*notify)(struct virtqueue *vq);
+	struct device *dma_dev;
+};
+
 /*
  * Creates a virtqueue and allocates the descriptor ring.  If
  * may_reduce_num is set, then this may allocate a smaller ring than
  * expected.  The caller should query virtqueue_get_vring_size to learn
  * the actual size of the ring.
  */
-struct virtqueue *vring_create_virtqueue(unsigned int index,
-					 unsigned int num,
-					 unsigned int vring_align,
-					 struct virtio_device *vdev,
-					 bool weak_barriers,
-					 bool may_reduce_num,
-					 bool ctx,
-					 bool (*notify)(struct virtqueue *vq),
-					 void (*callback)(struct virtqueue *vq),
-					 const char *name);
-
-/*
- * Creates a virtqueue and allocates the descriptor ring with per
- * virtqueue DMA device.
- */
-struct virtqueue *vring_create_virtqueue_dma(unsigned int index,
-					     unsigned int num,
-					     unsigned int vring_align,
-					     struct virtio_device *vdev,
-					     bool weak_barriers,
-					     bool may_reduce_num,
-					     bool ctx,
-					     bool (*notify)(struct virtqueue *vq),
-					     void (*callback)(struct virtqueue *vq),
-					     const char *name,
-					     struct device *dma_dev);
+struct virtqueue *vring_create_virtqueue(struct virtio_device *vdev,
+					 unsigned int index,
+					 struct vq_transport_config *tp_cfg,
+					 struct virtio_vq_config *cfg);
 
 /*
  * Creates a virtqueue with a standard layout but a caller-allocated
-- 
2.32.0.3.g01195cf9f

Re: [PATCH vhost 2/4] virtio: vring_create_virtqueue: pass struct instead of multi parameters

[Johannes Berg]

On Mon, 2024-03-04 at 19:47 +0800, Xuan Zhuo wrote:
> Now, we pass multi parameters to vring_create_virtqueue. These parameters
> may from transport or from driver.
> 
> vring_create_virtqueue is called by many places.
> Every time, we try to add a new parameter, that is difficult.
> 
> If parameters from the driver, that should directly be passed to vring.
> Then the vring can access the config from driver directly.
> 
> If parameters from the transport, we squish the parameters to a
> structure. That will be helpful to add new parameter.
> 
> Because the virtio_uml.c changes the name, so change the "names" inside
> the virtio_vq_config from "const char *const *names" to
> "const char **names".
> 
> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> ---
>  arch/um/drivers/virtio_uml.c       | 14 +++++---

Looks fine here.

Acked-by: Johannes Berg <johannes@sipsolutions.net>

johannes

[PATCH vhost 3/4] virtio: vring_new_virtqueue(): pass struct instead of multi parameters

[Xuan Zhuo]

Just like find_vqs(), it is time to refactor the
vring_new_virtqueue(). We pass the similar struct to
vring_new_virtqueue.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/platform/mellanox/mlxbf-tmfifo.c | 13 +++++---
 drivers/remoteproc/remoteproc_virtio.c   | 11 ++++---
 drivers/virtio/virtio_ring.c             | 29 +++++++++++-----
 include/linux/virtio_ring.h              | 42 +++++++++++++++++++-----
 tools/virtio/virtio_test.c               |  4 +--
 tools/virtio/vringh_test.c               | 28 ++++++++--------
 6 files changed, 85 insertions(+), 42 deletions(-)

diff --git a/drivers/platform/mellanox/mlxbf-tmfifo.c b/drivers/platform/mellanox/mlxbf-tmfifo.c
index 4252388f52a2..36cfce5ba8cf 100644
--- a/drivers/platform/mellanox/mlxbf-tmfifo.c
+++ b/drivers/platform/mellanox/mlxbf-tmfifo.c
@@ -1059,6 +1059,7 @@ static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev,
 					struct virtio_vq_config *cfg)
 {
 	struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
+	struct vq_transport_config tp_cfg = {};
 	struct virtqueue **vqs = cfg->vqs;
 	struct mlxbf_tmfifo_vring *vring;
 	unsigned int nvqs = cfg->nvqs;
@@ -1078,10 +1079,14 @@ static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev,
 		/* zero vring */
 		size = vring_size(vring->num, vring->align);
 		memset(vring->va, 0, size);
-		vq = vring_new_virtqueue(i, vring->num, vring->align, vdev,
-					 false, false, vring->va,
-					 mlxbf_tmfifo_virtio_notify,
-					 cfg->callbacks[i], cfg->names[i]);
+
+		tp_cfg.num = vring->num;
+		tp_cfg.vring_align = vring->align;
+		tp_cfg.weak_barriers = false;
+		tp_cfg.notify = mlxbf_tmfifo_virtio_notify;
+
+		cfg->cfg_idx = i;
+		vq = vring_new_virtqueue(vdev, i, vring->va, &tp_cfg, cfg);
 		if (!vq) {
 			dev_err(&vdev->dev, "vring_new_virtqueue failed\n");
 			ret = -ENOMEM;
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 57d51c9c7b63..70c32837f9dc 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -106,6 +106,7 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
 {
 	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
 	struct rproc *rproc = vdev_to_rproc(vdev);
+	struct vq_transport_config tp_cfg;
 	struct device *dev = &rproc->dev;
 	struct rproc_mem_entry *mem;
 	struct rproc_vring *rvring;
@@ -138,14 +139,16 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
 	dev_dbg(dev, "vring%d: va %pK qsz %d notifyid %d\n",
 		id, addr, num, rvring->notifyid);
 
+	tp_cfg.num = num;
+	tp_cfg.vring_align = rvring->align;
+	tp_cfg.weak_barriers = false;
+	tp_cfg.notify = rproc_virtio_notify;
+
 	/*
 	 * Create the new vq, and tell virtio we're not interested in
 	 * the 'weak' smp barriers, since we're talking with a real device.
 	 */
-	vq = vring_new_virtqueue(id, num, rvring->align, vdev, false,
-				 cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false,
-				 addr, rproc_virtio_notify, cfg->callbacks[cfg->cfg_idx],
-				 cfg->names[cfg->cfg_idx]);
+	vq = vring_new_virtqueue(vdev, id, addr, &tp_cfg, cfg);
 	if (!vq) {
 		dev_err(dev, "vring_new_virtqueue %s failed\n", cfg->names[cfg->cfg_idx]);
 		rproc_free_vring(rvring);
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 08858e2d761e..03687800d8ff 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2835,18 +2835,29 @@ int virtqueue_reset(struct virtqueue *_vq,
 EXPORT_SYMBOL_GPL(virtqueue_reset);
 
 /* Only available for split ring */
-struct virtqueue *vring_new_virtqueue(unsigned int index,
-				      unsigned int num,
-				      unsigned int vring_align,
-				      struct virtio_device *vdev,
-				      bool weak_barriers,
-				      bool context,
+struct virtqueue *vring_new_virtqueue(struct virtio_device *vdev,
+				      unsigned int index,
 				      void *pages,
-				      bool (*notify)(struct virtqueue *vq),
-				      void (*callback)(struct virtqueue *vq),
-				      const char *name)
+				      struct vq_transport_config *tp_cfg,
+				      struct virtio_vq_config *cfg)
 {
 	struct vring_virtqueue_split vring_split = {};
+	unsigned int num;
+	unsigned int vring_align;
+	bool weak_barriers;
+	bool context;
+	bool (*notify)(struct virtqueue *_);
+	void (*callback)(struct virtqueue *_);
+	const char *name;
+
+	num            = tp_cfg->num;
+	vring_align    = tp_cfg->vring_align;
+	weak_barriers  = tp_cfg->weak_barriers;
+	notify         = tp_cfg->notify;
+
+	name     = cfg->names[cfg->cfg_idx];
+	callback = cfg->callbacks[cfg->cfg_idx];
+	context  = cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false;
 
 	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
 		return NULL;
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index cd8042c79814..616937780785 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -85,16 +85,40 @@ struct virtqueue *vring_create_virtqueue(struct virtio_device *vdev,
  * Creates a virtqueue with a standard layout but a caller-allocated
  * ring.
  */
-struct virtqueue *vring_new_virtqueue(unsigned int index,
-				      unsigned int num,
-				      unsigned int vring_align,
-				      struct virtio_device *vdev,
-				      bool weak_barriers,
-				      bool ctx,
+struct virtqueue *vring_new_virtqueue(struct virtio_device *vdev,
+				      unsigned int index,
 				      void *pages,
-				      bool (*notify)(struct virtqueue *vq),
-				      void (*callback)(struct virtqueue *vq),
-				      const char *name);
+				      struct vq_transport_config *tp_cfg,
+				      struct virtio_vq_config *cfg);
+
+static inline struct virtqueue *vring_new_virtqueue_one(unsigned int index,
+							unsigned int num,
+							unsigned int vring_align,
+							struct virtio_device *vdev,
+							bool weak_barriers,
+							bool context,
+							void *pages,
+							bool (*notify)(struct virtqueue *vq),
+							void (*callback)(struct virtqueue *vq),
+							const char *name)
+{
+	struct vq_transport_config tp_cfg = {};
+	struct virtio_vq_config cfg = {};
+	vq_callback_t *callbacks[] = { callback };
+	const char *names[] = { name };
+
+	tp_cfg.num = num;
+	tp_cfg.vring_align = vring_align;
+	tp_cfg.weak_barriers = weak_barriers;
+	tp_cfg.notify = notify;
+
+	cfg.nvqs = 1;
+	cfg.callbacks = callbacks;
+	cfg.names = names;
+	cfg.ctx = &context;
+
+	return vring_new_virtqueue(vdev, index, pages, &tp_cfg, &cfg);
+}
 
 /*
  * Destroys a virtqueue.  If created with vring_create_virtqueue, this
diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 028f54e6854a..e41300d71d5e 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -102,8 +102,8 @@ static void vq_reset(struct vq_info *info, int num, struct virtio_device *vdev)
 
 	memset(info->ring, 0, vring_size(num, 4096));
 	vring_init(&info->vring, num, info->ring, 4096);
-	info->vq = vring_new_virtqueue(info->idx, num, 4096, vdev, true, false,
-				       info->ring, vq_notify, vq_callback, "test");
+	info->vq = vring_new_virtqueue_one(info->idx, num, 4096, vdev, true, false,
+					   info->ring, vq_notify, vq_callback, "test");
 	assert(info->vq);
 	info->vq->priv = info;
 }
diff --git a/tools/virtio/vringh_test.c b/tools/virtio/vringh_test.c
index 98ff808d6f0c..040689111584 100644
--- a/tools/virtio/vringh_test.c
+++ b/tools/virtio/vringh_test.c
@@ -316,11 +316,11 @@ static int parallel_test(u64 features,
 		if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set))
 			err(1, "Could not set affinity to cpu %u", first_cpu);
 
-		vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &gvdev.vdev, true,
-					 false, guest_map,
-					 fast_vringh ? no_notify_host
-					 : parallel_notify_host,
-					 never_callback_guest, "guest vq");
+		vq = vring_new_virtqueue_one(0, RINGSIZE, ALIGN, &gvdev.vdev, true,
+					     false, guest_map,
+					     fast_vringh ? no_notify_host
+					     : parallel_notify_host,
+					     never_callback_guest, "guest vq");
 
 		/* Don't kfree indirects. */
 		__kfree_ignore_start = indirects;
@@ -485,10 +485,10 @@ int main(int argc, char *argv[])
 	memset(__user_addr_min, 0, vring_size(RINGSIZE, ALIGN));
 
 	/* Set up guest side. */
-	vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true, false,
-				 __user_addr_min,
-				 never_notify_host, never_callback_guest,
-				 "guest vq");
+	vq = vring_new_virtqueue_one(0, RINGSIZE, ALIGN, &vdev, true, false,
+				     __user_addr_min,
+				     never_notify_host, never_callback_guest,
+				     "guest vq");
 
 	/* Set up host side. */
 	vring_init(&vrh.vring, RINGSIZE, __user_addr_min, ALIGN);
@@ -668,11 +668,11 @@ int main(int argc, char *argv[])
 
 		/* Force creation of direct, which we modify. */
 		__virtio_clear_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC);
-		vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
-					 false, __user_addr_min,
-					 never_notify_host,
-					 never_callback_guest,
-					 "guest vq");
+		vq = vring_new_virtqueue_one(0, RINGSIZE, ALIGN, &vdev, true,
+					     false, __user_addr_min,
+					     never_notify_host,
+					     never_callback_guest,
+					     "guest vq");
 
 		sg_init_table(guest_sg, 4);
 		sg_set_buf(&guest_sg[0], d, sizeof(*d)*2);
-- 
2.32.0.3.g01195cf9f

Re: [PATCH vhost 3/4] virtio: vring_new_virtqueue(): pass struct instead of multi parameters

[Ilpo Järvinen]

On Mon, 4 Mar 2024, Xuan Zhuo wrote:

> Just like find_vqs(), it is time to refactor the
> vring_new_virtqueue(). We pass the similar struct to
> vring_new_virtqueue.

Please write a proper commit message here and do not just refer to 
some other commit to describe what's going on here.

-- 
 i.

Re: [PATCH vhost 3/4] virtio: vring_new_virtqueue(): pass struct instead of multi parameters

[Xuan Zhuo]

On Tue, 5 Mar 2024 13:27:25 +0200 (EET), =?utf-8?q?Ilpo_J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com> wrote:
> On Mon, 4 Mar 2024, Xuan Zhuo wrote:
>
> > Just like find_vqs(), it is time to refactor the
> > vring_new_virtqueue(). We pass the similar struct to
> > vring_new_virtqueue.
>
> Please write a proper commit message here and do not just refer to
> some other commit to describe what's going on here.


YES.

Thanks.


>
> --
>  i.
>

[PATCH vhost 4/4] virtio_ring: simplify the parameters of the funcs related to vring_create/new_virtqueue()

[Xuan Zhuo]

As the refactor of find_vqs()/vring_new_virtqueue()/vring_create_virtqueue
the struct cfg/tp_cfg are passed to vring.

This patch refactors the vring by these structures. This can simplify
the code.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 157 +++++++++++------------------------
 1 file changed, 50 insertions(+), 107 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 03687800d8ff..94c442ba844f 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -223,15 +223,11 @@ struct vring_virtqueue {
 #endif
 };
 
-static struct virtqueue *__vring_new_virtqueue(unsigned int index,
+static struct virtqueue *__vring_new_virtqueue(struct virtio_device *vdev,
+					       unsigned int index,
 					       struct vring_virtqueue_split *vring_split,
-					       struct virtio_device *vdev,
-					       bool weak_barriers,
-					       bool context,
-					       bool (*notify)(struct virtqueue *),
-					       void (*callback)(struct virtqueue *),
-					       const char *name,
-					       struct device *dma_dev);
+					       struct vq_transport_config *tp_cfg,
+					       struct virtio_vq_config *cfg);
 static struct vring_desc_extra *vring_alloc_desc_extra(unsigned int num);
 static void vring_free(struct virtqueue *_vq);
 
@@ -240,6 +236,8 @@ static void vring_free(struct virtqueue *_vq);
  */
 
 #define to_vvq(_vq) container_of_const(_vq, struct vring_virtqueue, vq)
+#define cfg_vq_val(cfg, key) (cfg->key[cfg->cfg_idx])
+#define cfg_vq_get(cfg, key) (cfg->key ? cfg_vq_val(cfg, key) : false)
 
 static bool virtqueue_use_indirect(const struct vring_virtqueue *vq,
 				   unsigned int total_sg)
@@ -1138,32 +1136,28 @@ static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
 	return 0;
 }
 
-static struct virtqueue *vring_create_virtqueue_split(
-	unsigned int index,
-	unsigned int num,
-	unsigned int vring_align,
-	struct virtio_device *vdev,
-	bool weak_barriers,
-	bool may_reduce_num,
-	bool context,
-	bool (*notify)(struct virtqueue *),
-	void (*callback)(struct virtqueue *),
-	const char *name,
-	struct device *dma_dev)
+static struct virtqueue *vring_create_virtqueue_split(struct virtio_device *vdev,
+						      unsigned int index,
+						      struct vq_transport_config *tp_cfg,
+						      struct virtio_vq_config *cfg)
 {
 	struct vring_virtqueue_split vring_split = {};
 	struct virtqueue *vq;
 	int err;
 
-	err = vring_alloc_queue_split(&vring_split, vdev, num, vring_align,
-				      may_reduce_num, dma_dev);
+	tp_cfg->dma_dev = tp_cfg->dma_dev ? : vdev->dev.parent;
+
+	err = vring_alloc_queue_split(&vring_split, vdev,
+				      tp_cfg->num,
+				      tp_cfg->vring_align,
+				      tp_cfg->may_reduce_num,
+				      tp_cfg->dma_dev);
 	if (err)
 		return NULL;
 
-	vq = __vring_new_virtqueue(index, &vring_split, vdev, weak_barriers,
-				   context, notify, callback, name, dma_dev);
+	vq = __vring_new_virtqueue(vdev, index, &vring_split, tp_cfg, cfg);
 	if (!vq) {
-		vring_free_split(&vring_split, vdev, dma_dev);
+		vring_free_split(&vring_split, vdev, tp_cfg->dma_dev);
 		return NULL;
 	}
 
@@ -2050,38 +2044,33 @@ static void virtqueue_reinit_packed(struct vring_virtqueue *vq)
 	virtqueue_vring_init_packed(&vq->packed, !!vq->vq.callback);
 }
 
-static struct virtqueue *vring_create_virtqueue_packed(
-	unsigned int index,
-	unsigned int num,
-	unsigned int vring_align,
-	struct virtio_device *vdev,
-	bool weak_barriers,
-	bool may_reduce_num,
-	bool context,
-	bool (*notify)(struct virtqueue *),
-	void (*callback)(struct virtqueue *),
-	const char *name,
-	struct device *dma_dev)
+static struct virtqueue *vring_create_virtqueue_packed(struct virtio_device *vdev,
+						       unsigned int index,
+						       struct vq_transport_config *tp_cfg,
+						       struct virtio_vq_config *cfg)
 {
 	struct vring_virtqueue_packed vring_packed = {};
 	struct vring_virtqueue *vq;
+	struct device *dma_dev;
 	int err;
 
-	if (vring_alloc_queue_packed(&vring_packed, vdev, num, dma_dev))
+	dma_dev = tp_cfg->dma_dev ? : vdev->dev.parent;
+
+	if (vring_alloc_queue_packed(&vring_packed, vdev, tp_cfg->num, dma_dev))
 		goto err_ring;
 
 	vq = kmalloc(sizeof(*vq), GFP_KERNEL);
 	if (!vq)
 		goto err_vq;
 
-	vq->vq.callback = callback;
+	vq->vq.callback = cfg_vq_val(cfg, callbacks);
 	vq->vq.vdev = vdev;
-	vq->vq.name = name;
+	vq->vq.name = cfg_vq_val(cfg, names);
 	vq->vq.index = index;
 	vq->vq.reset = false;
 	vq->we_own_ring = true;
-	vq->notify = notify;
-	vq->weak_barriers = weak_barriers;
+	vq->notify = tp_cfg->notify;
+	vq->weak_barriers = tp_cfg->weak_barriers;
 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
 	vq->broken = true;
 #else
@@ -2094,7 +2083,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
 	vq->do_unmap = vq->use_dma_api;
 
 	vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
-		!context;
+		!cfg_vq_get(cfg, ctx);
 	vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
 
 	if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
@@ -2104,9 +2093,9 @@ static struct virtqueue *vring_create_virtqueue_packed(
 	if (err)
 		goto err_state_extra;
 
-	virtqueue_vring_init_packed(&vring_packed, !!callback);
+	virtqueue_vring_init_packed(&vring_packed, !!cfg_vq_val(cfg, callbacks));
 
-	virtqueue_init(vq, num);
+	virtqueue_init(vq, tp_cfg->num);
 	virtqueue_vring_attach_packed(vq, &vring_packed);
 
 	spin_lock(&vdev->vqs_list_lock);
@@ -2599,15 +2588,11 @@ irqreturn_t vring_interrupt(int irq, void *_vq)
 EXPORT_SYMBOL_GPL(vring_interrupt);
 
 /* Only available for split ring */
-static struct virtqueue *__vring_new_virtqueue(unsigned int index,
+static struct virtqueue *__vring_new_virtqueue(struct virtio_device *vdev,
+					       unsigned int index,
 					       struct vring_virtqueue_split *vring_split,
-					       struct virtio_device *vdev,
-					       bool weak_barriers,
-					       bool context,
-					       bool (*notify)(struct virtqueue *),
-					       void (*callback)(struct virtqueue *),
-					       const char *name,
-					       struct device *dma_dev)
+					       struct vq_transport_config *tp_cfg,
+					       struct virtio_vq_config *cfg)
 {
 	struct vring_virtqueue *vq;
 	int err;
@@ -2620,26 +2605,26 @@ static struct virtqueue *__vring_new_virtqueue(unsigned int index,
 		return NULL;
 
 	vq->packed_ring = false;
-	vq->vq.callback = callback;
+	vq->vq.callback = cfg_vq_val(cfg, callbacks);
 	vq->vq.vdev = vdev;
-	vq->vq.name = name;
+	vq->vq.name = cfg_vq_val(cfg, names);
 	vq->vq.index = index;
 	vq->vq.reset = false;
 	vq->we_own_ring = false;
-	vq->notify = notify;
-	vq->weak_barriers = weak_barriers;
+	vq->notify = tp_cfg->notify;
+	vq->weak_barriers = tp_cfg->weak_barriers;
 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
 	vq->broken = true;
 #else
 	vq->broken = false;
 #endif
-	vq->dma_dev = dma_dev;
+	vq->dma_dev = tp_cfg->dma_dev;
 	vq->use_dma_api = vring_use_dma_api(vdev);
 	vq->premapped = false;
 	vq->do_unmap = vq->use_dma_api;
 
 	vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
-		!context;
+		!cfg_vq_get(cfg, ctx);
 	vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
 
 	if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
@@ -2667,36 +2652,10 @@ struct virtqueue *vring_create_virtqueue(struct virtio_device *vdev,
 					 struct vq_transport_config *tp_cfg,
 					 struct virtio_vq_config *cfg)
 {
-	struct device *dma_dev;
-	unsigned int num;
-	unsigned int vring_align;
-	bool weak_barriers;
-	bool may_reduce_num;
-	bool context;
-	bool (*notify)(struct virtqueue *_);
-	void (*callback)(struct virtqueue *_);
-	const char *name;
-
-	dma_dev = tp_cfg->dma_dev ? : vdev->dev.parent;
-
-	num            = tp_cfg->num;
-	vring_align    = tp_cfg->vring_align;
-	weak_barriers  = tp_cfg->weak_barriers;
-	may_reduce_num = tp_cfg->may_reduce_num;
-	notify         = tp_cfg->notify;
-
-	name     = cfg->names[cfg->cfg_idx];
-	callback = cfg->callbacks[cfg->cfg_idx];
-	context  = cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false;
-
 	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
-		return vring_create_virtqueue_packed(index, num, vring_align,
-				vdev, weak_barriers, may_reduce_num,
-				context, notify, callback, name, dma_dev);
+		return vring_create_virtqueue_packed(vdev, index, tp_cfg, cfg);
 
-	return vring_create_virtqueue_split(index, num, vring_align,
-			vdev, weak_barriers, may_reduce_num,
-			context, notify, callback, name, dma_dev);
+	return vring_create_virtqueue_split(vdev, index, tp_cfg, cfg);
 }
 EXPORT_SYMBOL_GPL(vring_create_virtqueue);
 
@@ -2842,30 +2801,14 @@ struct virtqueue *vring_new_virtqueue(struct virtio_device *vdev,
 				      struct virtio_vq_config *cfg)
 {
 	struct vring_virtqueue_split vring_split = {};
-	unsigned int num;
-	unsigned int vring_align;
-	bool weak_barriers;
-	bool context;
-	bool (*notify)(struct virtqueue *_);
-	void (*callback)(struct virtqueue *_);
-	const char *name;
-
-	num            = tp_cfg->num;
-	vring_align    = tp_cfg->vring_align;
-	weak_barriers  = tp_cfg->weak_barriers;
-	notify         = tp_cfg->notify;
-
-	name     = cfg->names[cfg->cfg_idx];
-	callback = cfg->callbacks[cfg->cfg_idx];
-	context  = cfg->ctx ? cfg->ctx[cfg->cfg_idx] : false;
 
 	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
 		return NULL;
 
-	vring_init(&vring_split.vring, num, pages, vring_align);
-	return __vring_new_virtqueue(index, &vring_split, vdev, weak_barriers,
-				     context, notify, callback, name,
-				     vdev->dev.parent);
+	tp_cfg->dma_dev = vdev->dev.parent;
+
+	vring_init(&vring_split.vring, tp_cfg->num, pages, tp_cfg->vring_align);
+	return __vring_new_virtqueue(vdev, index, &vring_split, tp_cfg, cfg);
 }
 EXPORT_SYMBOL_GPL(vring_new_virtqueue);
 
-- 
2.32.0.3.g01195cf9f