[dpdk-dev] [PATCH 30/40] net/virtio: add Virtio-user vring address ops

[Maxime Coquelin]

This patch introduces a new callback for setting
vrings addresses.

Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 drivers/net/virtio/virtio_user/vhost.h        |  1 +
 drivers/net/virtio/virtio_user/vhost_kernel.c | 32 +++++++++++++------
 drivers/net/virtio/virtio_user/vhost_user.c   | 29 +++++++++++++----
 drivers/net/virtio/virtio_user/vhost_vdpa.c   |  8 ++++-
 .../net/virtio/virtio_user/virtio_user_dev.c  |  2 +-
 5 files changed, 55 insertions(+), 17 deletions(-)

diff --git a/drivers/net/virtio/virtio_user/vhost.h b/drivers/net/virtio/virtio_user/vhost.h
index b296ee215d..956eb58728 100644
--- a/drivers/net/virtio/virtio_user/vhost.h
+++ b/drivers/net/virtio/virtio_user/vhost.h
@@ -113,6 +113,7 @@ struct virtio_user_backend_ops {
 	int (*get_vring_base)(struct virtio_user_dev *dev, struct vhost_vring_state *state);
 	int (*set_vring_call)(struct virtio_user_dev *dev, struct vhost_vring_file *file);
 	int (*set_vring_kick)(struct virtio_user_dev *dev, struct vhost_vring_file *file);
+	int (*set_vring_addr)(struct virtio_user_dev *dev, struct vhost_vring_addr *addr);
 	int (*send_request)(struct virtio_user_dev *dev,
 			    enum vhost_user_request req,
 			    void *arg);
diff --git a/drivers/net/virtio/virtio_user/vhost_kernel.c b/drivers/net/virtio/virtio_user/vhost_kernel.c
index 1805aee7f7..8cd86b72c6 100644
--- a/drivers/net/virtio/virtio_user/vhost_kernel.c
+++ b/drivers/net/virtio/virtio_user/vhost_kernel.c
@@ -294,9 +294,30 @@ vhost_kernel_set_vring_call(struct virtio_user_dev *dev, struct vhost_vring_file
 	return vhost_kernel_set_vring_file(dev, VHOST_SET_VRING_KICK, file);
 }
 
+static int
+vhost_kernel_set_vring_addr(struct virtio_user_dev *dev, struct vhost_vring_addr *addr)
+{
+	int ret, fd;
+	uint32_t index = addr->index;
+
+	/* Convert from queue index to queue-pair & offset */
+	fd = dev->vhostfds[addr->index / 2];
+	addr->index %= 2;
+
+	ret = vhost_kernel_ioctl(fd, VHOST_SET_VRING_ADDR, addr);
+	if (ret < 0) {
+		PMD_DRV_LOG(ERR, "Failed to set vring address");
+		return -1;
+	}
+
+	/* restore index back to queue index */
+	addr->index = index;
+
+	return 0;
+}
+
 static uint64_t vhost_req_user_to_kernel[] = {
 	[VHOST_USER_RESET_OWNER] = VHOST_RESET_OWNER,
-	[VHOST_USER_SET_VRING_ADDR] = VHOST_SET_VRING_ADDR,
 };
 
 static int
@@ -308,20 +329,12 @@ vhost_kernel_send_request(struct virtio_user_dev *dev,
 	unsigned int i;
 	uint64_t req_kernel;
 	int vhostfd;
-	unsigned int queue_sel;
 
 	PMD_DRV_LOG(INFO, "%s", vhost_msg_strings[req]);
 
 	req_kernel = vhost_req_user_to_kernel[req];
 
 	switch (req_kernel) {
-	case VHOST_SET_VRING_ADDR:
-		queue_sel = *(unsigned int *)arg;
-		vhostfd = dev->vhostfds[queue_sel / 2];
-		*(unsigned int *)arg = queue_sel % 2;
-		PMD_DRV_LOG(DEBUG, "vhostfd=%d, index=%u",
-			    vhostfd, *(unsigned int *)arg);
-		break;
 	default:
 		vhostfd = -1;
 	}
@@ -473,6 +486,7 @@ struct virtio_user_backend_ops virtio_ops_kernel = {
 	.get_vring_base = vhost_kernel_get_vring_base,
 	.set_vring_call = vhost_kernel_set_vring_call,
 	.set_vring_kick = vhost_kernel_set_vring_kick,
+	.set_vring_addr = vhost_kernel_set_vring_addr,
 	.send_request = vhost_kernel_send_request,
 	.enable_qp = vhost_kernel_enable_queue_pair
 };
diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c
index 509a96dfbc..59cf366683 100644
--- a/drivers/net/virtio/virtio_user/vhost_user.c
+++ b/drivers/net/virtio/virtio_user/vhost_user.c
@@ -523,11 +523,32 @@ vhost_user_set_vring_kick(struct virtio_user_dev *dev, struct vhost_vring_file *
 	return vhost_user_set_vring_file(dev, VHOST_USER_SET_VRING_KICK, file);
 }
 
+
+static int
+vhost_user_set_vring_addr(struct virtio_user_dev *dev, struct vhost_vring_addr *addr)
+{
+	int ret;
+	struct vhost_user_msg msg = {
+		.request = VHOST_USER_SET_VRING_ADDR,
+		.flags = VHOST_USER_VERSION,
+		.size = sizeof(*addr),
+		.payload.addr = *addr,
+	};
+
+	ret = vhost_user_write(dev->vhostfd, &msg, NULL, 0);
+	if (ret < 0) {
+		PMD_DRV_LOG(ERR, "Failed to send vring addresses");
+		return -1;
+	}
+
+	return 0;
+}
+
+
 static struct vhost_user_msg m;
 
 const char * const vhost_msg_strings[] = {
 	[VHOST_USER_RESET_OWNER] = "VHOST_RESET_OWNER",
-	[VHOST_USER_SET_VRING_ADDR] = "VHOST_SET_VRING_ADDR",
 	[VHOST_USER_SET_STATUS] = "VHOST_SET_STATUS",
 	[VHOST_USER_GET_STATUS] = "VHOST_GET_STATUS",
 };
@@ -589,11 +610,6 @@ vhost_user_sock(struct virtio_user_dev *dev,
 		fds[fd_num++] = *((int *)arg);
 		break;
 
-	case VHOST_USER_SET_VRING_ADDR:
-		memcpy(&msg.payload.addr, arg, sizeof(msg.payload.addr));
-		msg.size = sizeof(m.payload.addr);
-		break;
-
 	case VHOST_USER_SET_VRING_ERR:
 		file = arg;
 		msg.payload.u64 = file->index & VHOST_USER_VRING_IDX_MASK;
@@ -767,6 +783,7 @@ struct virtio_user_backend_ops virtio_ops_user = {
 	.get_vring_base = vhost_user_get_vring_base,
 	.set_vring_call = vhost_user_set_vring_call,
 	.set_vring_kick = vhost_user_set_vring_kick,
+	.set_vring_addr = vhost_user_set_vring_addr,
 	.send_request = vhost_user_sock,
 	.enable_qp = vhost_user_enable_queue_pair
 };
diff --git a/drivers/net/virtio/virtio_user/vhost_vdpa.c b/drivers/net/virtio/virtio_user/vhost_vdpa.c
index 48fe3f23e8..e09e7c9fb8 100644
--- a/drivers/net/virtio/virtio_user/vhost_vdpa.c
+++ b/drivers/net/virtio/virtio_user/vhost_vdpa.c
@@ -36,7 +36,6 @@
 
 static uint64_t vhost_req_user_to_vdpa[] = {
 	[VHOST_USER_RESET_OWNER] = VHOST_RESET_OWNER,
-	[VHOST_USER_SET_VRING_ADDR] = VHOST_SET_VRING_ADDR,
 	[VHOST_USER_SET_STATUS] = VHOST_VDPA_SET_STATUS,
 	[VHOST_USER_GET_STATUS] = VHOST_VDPA_GET_STATUS,
 };
@@ -248,6 +247,12 @@ vhost_vdpa_set_vring_kick(struct virtio_user_dev *dev, struct vhost_vring_file *
 	return vhost_vdpa_ioctl(dev->vhostfd, VHOST_SET_VRING_KICK, file);
 }
 
+static int
+vhost_vdpa_set_vring_addr(struct virtio_user_dev *dev, struct vhost_vring_addr *addr)
+{
+	return vhost_vdpa_ioctl(dev->vhostfd, VHOST_SET_VRING_ADDR, addr);
+}
+
 /* with below features, vhost vdpa does not need to do the checksum and TSO,
  * these info will be passed to virtio_user through virtio net header.
  */
@@ -357,6 +362,7 @@ struct virtio_user_backend_ops virtio_ops_vdpa = {
 	.get_vring_base = vhost_vdpa_get_vring_base,
 	.set_vring_call = vhost_vdpa_set_vring_call,
 	.set_vring_kick = vhost_vdpa_set_vring_kick,
+	.set_vring_addr = vhost_vdpa_set_vring_addr,
 	.send_request = vhost_vdpa_send_request,
 	.enable_qp = vhost_vdpa_enable_queue_pair,
 	.dma_map = vhost_vdpa_dma_map,
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index e4975838ea..48ca7a2548 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -81,7 +81,7 @@ virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
 		state.num |= (1 << 15);
 	dev->ops->set_vring_base(dev, &state);
 
-	dev->ops->send_request(dev, VHOST_USER_SET_VRING_ADDR, &addr);
+	dev->ops->set_vring_addr(dev, &addr);
 
 	/* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes
 	 * lastly because vhost depends on this msg to judge if
-- 
2.29.2