X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=drivers%2Fnet%2Fvirtio%2Fvirtio_user%2Fvhost_kernel.c;h=202a8cdee1ca91a42659af628dcfd40b812c1acb;hb=1dfb92a529722c87b251eaaf673c48b13d1a54cc;hp=2047d41a500318ed0ecaa26dcf162d5a4e41023c;hpb=5b75b63c324a7a3b0101b4cf1e245b8b8a0f22bd;p=dpdk.git

diff --git a/drivers/net/virtio/virtio_user/vhost_kernel.c b/drivers/net/virtio/virtio_user/vhost_kernel.c
index 2047d41a50..202a8cdee1 100644
--- a/drivers/net/virtio/virtio_user/vhost_kernel.c
+++ b/drivers/net/virtio/virtio_user/vhost_kernel.c
@@ -14,6 +14,11 @@
 #include "virtio_user_dev.h"
 #include "vhost_kernel_tap.h"
 
+struct vhost_kernel_data {
+	int *vhostfds;
+	int *tapfds;
+};
+
 struct vhost_memory_kernel {
 	uint32_t nregions;
 	uint32_t padding;
@@ -96,22 +101,36 @@ vhost_kernel_ioctl(int fd, uint64_t request, void *arg)
 static int
 vhost_kernel_set_owner(struct virtio_user_dev *dev)
 {
-	return vhost_kernel_ioctl(dev->vhostfds[0], VHOST_SET_OWNER, NULL);
+	int ret;
+	uint32_t i;
+	struct vhost_kernel_data *data = dev->backend_data;
+
+	for (i = 0; i < dev->max_queue_pairs; ++i) {
+		if (data->vhostfds[i] < 0)
+			continue;
+
+		ret = vhost_kernel_ioctl(data->vhostfds[i], VHOST_SET_OWNER, NULL);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
 }
 
 static int
 vhost_kernel_get_features(struct virtio_user_dev *dev, uint64_t *features)
 {
+	struct vhost_kernel_data *data = dev->backend_data;
+	unsigned int tap_flags;
 	int ret;
-	unsigned int tap_features;
 
-	ret = vhost_kernel_ioctl(dev->vhostfds[0], VHOST_GET_FEATURES, features);
+	ret = vhost_kernel_ioctl(data->vhostfds[0], VHOST_GET_FEATURES, features);
 	if (ret < 0) {
 		PMD_DRV_LOG(ERR, "Failed to get features");
 		return -1;
 	}
 
-	ret = tap_support_features(&tap_features);
+	ret = tap_get_flags(data->tapfds[0], &tap_flags);
 	if (ret < 0) {
 		PMD_DRV_LOG(ERR, "Failed to get TAP features");
 		return -1;
@@ -121,7 +140,7 @@ vhost_kernel_get_features(struct virtio_user_dev *dev, uint64_t *features)
 	 * but not claimed by vhost-net, so we add them back when
 	 * reporting to upper layer.
 	 */
-	if (tap_features & IFF_VNET_HDR) {
+	if (tap_flags & IFF_VNET_HDR) {
 		*features |= VHOST_KERNEL_GUEST_OFFLOADS_MASK;
 		*features |= VHOST_KERNEL_HOST_OFFLOADS_MASK;
 	}
@@ -129,7 +148,7 @@ vhost_kernel_get_features(struct virtio_user_dev *dev, uint64_t *features)
 	/* vhost_kernel will not declare this feature, but it does
 	 * support multi-queue.
 	 */
-	if (tap_features & IFF_MULTI_QUEUE)
+	if (tap_flags & IFF_MULTI_QUEUE)
 		*features |= (1ull << VIRTIO_NET_F_MQ);
 
 	return 0;
@@ -138,6 +157,10 @@ vhost_kernel_get_features(struct virtio_user_dev *dev, uint64_t *features)
 static int
 vhost_kernel_set_features(struct virtio_user_dev *dev, uint64_t features)
 {
+	struct vhost_kernel_data *data = dev->backend_data;
+	uint32_t i;
+	int ret;
+
 	/* We don't need memory protection here */
 	features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
 	/* VHOST kernel does not know about below flags */
@@ -145,7 +168,16 @@ vhost_kernel_set_features(struct virtio_user_dev *dev, uint64_t features)
 	features &= ~VHOST_KERNEL_HOST_OFFLOADS_MASK;
 	features &= ~(1ULL << VIRTIO_NET_F_MQ);
 
-	return vhost_kernel_ioctl(dev->vhostfds[0], VHOST_SET_FEATURES, &features);
+	for (i = 0; i < dev->max_queue_pairs; ++i) {
+		if (data->vhostfds[i] < 0)
+			continue;
+
+		ret = vhost_kernel_ioctl(data->vhostfds[i], VHOST_SET_FEATURES, &features);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
 }
 
 static int
@@ -185,6 +217,8 @@ add_memseg_list(const struct rte_memseg_list *msl, void *arg)
 static int
 vhost_kernel_set_memory_table(struct virtio_user_dev *dev)
 {
+	uint32_t i;
+	struct vhost_kernel_data *data = dev->backend_data;
 	struct vhost_memory_kernel *vm;
 	int ret;
 
@@ -205,9 +239,14 @@ vhost_kernel_set_memory_table(struct virtio_user_dev *dev)
 	if (ret < 0)
 		goto err_free;
 
-	ret = vhost_kernel_ioctl(dev->vhostfds[0], VHOST_SET_MEM_TABLE, vm);
-	if (ret < 0)
-		goto err_free;
+	for (i = 0; i < dev->max_queue_pairs; ++i) {
+		if (data->vhostfds[i] < 0)
+			continue;
+
+		ret = vhost_kernel_ioctl(data->vhostfds[i], VHOST_SET_MEM_TABLE, vm);
+		if (ret < 0)
+			goto err_free;
+	}
 
 	free(vm);
 
@@ -224,9 +263,10 @@ vhost_kernel_set_vring(struct virtio_user_dev *dev, uint64_t req, struct vhost_v
 {
 	int ret, fd;
 	unsigned int index = state->index;
+	struct vhost_kernel_data *data = dev->backend_data;
 
 	/* Convert from queue index to queue-pair & offset */
-	fd = dev->vhostfds[state->index / 2];
+	fd = data->vhostfds[state->index / 2];
 	state->index %= 2;
 
 	ret = vhost_kernel_ioctl(fd, req, state);
@@ -265,9 +305,10 @@ vhost_kernel_set_vring_file(struct virtio_user_dev *dev, uint64_t req,
 {
 	int ret, fd;
 	unsigned int index = file->index;
+	struct vhost_kernel_data *data = dev->backend_data;
 
 	/* Convert from queue index to queue-pair & offset */
-	fd = dev->vhostfds[file->index / 2];
+	fd = data->vhostfds[file->index / 2];
 	file->index %= 2;
 
 	ret = vhost_kernel_ioctl(fd, req, file);
@@ -299,9 +340,10 @@ vhost_kernel_set_vring_addr(struct virtio_user_dev *dev, struct vhost_vring_addr
 {
 	int ret, fd;
 	unsigned int index = addr->index;
+	struct vhost_kernel_data *data = dev->backend_data;
 
 	/* Convert from queue index to queue-pair & offset */
-	fd = dev->vhostfds[addr->index / 2];
+	fd = data->vhostfds[addr->index / 2];
 	addr->index %= 2;
 
 	ret = vhost_kernel_ioctl(fd, VHOST_SET_VRING_ADDR, addr);
@@ -338,22 +380,119 @@ vhost_kernel_set_status(struct virtio_user_dev *dev __rte_unused, uint8_t status
 static int
 vhost_kernel_setup(struct virtio_user_dev *dev)
 {
+	struct vhost_kernel_data *data;
+	unsigned int tap_features;
+	unsigned int tap_flags;
+	const char *ifname;
+	uint32_t q, i;
 	int vhostfd;
-	uint32_t i;
+
+	if (tap_support_features(&tap_features) < 0)
+		return -1;
+
+	if ((tap_features & IFF_VNET_HDR) == 0) {
+		PMD_INIT_LOG(ERR, "TAP does not support IFF_VNET_HDR");
+		return -1;
+	}
+
+	data = malloc(sizeof(*data));
+	if (!data) {
+		PMD_INIT_LOG(ERR, "(%s) Failed to allocate Vhost-kernel data", dev->path);
+		return -1;
+	}
+
+	data->vhostfds = malloc(dev->max_queue_pairs * sizeof(int));
+	if (!data->vhostfds) {
+		PMD_INIT_LOG(ERR, "(%s) Failed to allocate Vhost FDs", dev->path);
+		goto err_data;
+	}
+	data->tapfds = malloc(dev->max_queue_pairs * sizeof(int));
+	if (!data->tapfds) {
+		PMD_INIT_LOG(ERR, "(%s) Failed to allocate TAP FDs", dev->path);
+		goto err_vhostfds;
+	}
+
+	for (q = 0; q < dev->max_queue_pairs; ++q) {
+		data->vhostfds[q] = -1;
+		data->tapfds[q] = -1;
+	}
 
 	get_vhost_kernel_max_regions();
 
 	for (i = 0; i < dev->max_queue_pairs; ++i) {
 		vhostfd = open(dev->path, O_RDWR);
 		if (vhostfd < 0) {
-			PMD_DRV_LOG(ERR, "fail to open %s, %s",
-				    dev->path, strerror(errno));
-			return -1;
+			PMD_DRV_LOG(ERR, "fail to open %s, %s", dev->path, strerror(errno));
+			goto err_tapfds;
 		}
+		data->vhostfds[i] = vhostfd;
+	}
 
-		dev->vhostfds[i] = vhostfd;
+	ifname = dev->ifname != NULL ? dev->ifname : "tap%d";
+	data->tapfds[0] = tap_open(ifname, (tap_features & IFF_MULTI_QUEUE) != 0);
+	if (data->tapfds[0] < 0)
+		goto err_tapfds;
+	if (dev->ifname == NULL && tap_get_name(data->tapfds[0], &dev->ifname) < 0) {
+		PMD_DRV_LOG(ERR, "fail to get tap name (%d)", data->tapfds[0]);
+		goto err_tapfds;
+	}
+	if (tap_get_flags(data->tapfds[0], &tap_flags) < 0) {
+		PMD_DRV_LOG(ERR, "fail to get tap flags for tap %s", dev->ifname);
+		goto err_tapfds;
+	}
+	if ((tap_flags & IFF_MULTI_QUEUE) == 0 && dev->max_queue_pairs > 1) {
+		PMD_DRV_LOG(ERR, "tap %s does not support multi queue", dev->ifname);
+		goto err_tapfds;
 	}
 
+	for (i = 1; i < dev->max_queue_pairs; i++) {
+		data->tapfds[i] = tap_open(dev->ifname, true);
+		if (data->tapfds[i] < 0)
+			goto err_tapfds;
+	}
+
+	dev->backend_data = data;
+
+	return 0;
+
+err_tapfds:
+	for (i = 0; i < dev->max_queue_pairs; i++) {
+		if (data->vhostfds[i] >= 0)
+			close(data->vhostfds[i]);
+		if (data->tapfds[i] >= 0)
+			close(data->tapfds[i]);
+	}
+
+	free(data->tapfds);
+err_vhostfds:
+	free(data->vhostfds);
+err_data:
+	free(data);
+
+	return -1;
+}
+
+static int
+vhost_kernel_destroy(struct virtio_user_dev *dev)
+{
+	struct vhost_kernel_data *data = dev->backend_data;
+	uint32_t i;
+
+	if (!data)
+		return 0;
+
+	for (i = 0; i < dev->max_queue_pairs; ++i) {
+		if (data->vhostfds[i] >= 0)
+			close(data->vhostfds[i]);
+		if (data->tapfds[i] >= 0)
+			close(data->tapfds[i]);
+	}
+
+	free(data->vhostfds);
+	free(data->tapfds);
+	free(data);
+	dev->backend_data = NULL;
+
 	return 0;
 }
 
@@ -385,57 +524,42 @@ vhost_kernel_enable_queue_pair(struct virtio_user_dev *dev,
 			       uint16_t pair_idx,
 			       int enable)
 {
+	struct vhost_kernel_data *data = dev->backend_data;
 	int hdr_size;
 	int vhostfd;
 	int tapfd;
-	int req_mq = (dev->max_queue_pairs > 1);
-
-	vhostfd = dev->vhostfds[pair_idx];
 
 	if (dev->qp_enabled[pair_idx] == enable)
 		return 0;
 
+	vhostfd = data->vhostfds[pair_idx];
+	tapfd = data->tapfds[pair_idx];
+
 	if (!enable) {
-		tapfd = dev->tapfds[pair_idx];
 		if (vhost_kernel_set_backend(vhostfd, -1) < 0) {
 			PMD_DRV_LOG(ERR, "fail to set backend for vhost kernel");
 			return -1;
 		}
-		if (req_mq && vhost_kernel_tap_set_queue(tapfd, false) < 0) {
-			PMD_DRV_LOG(ERR, "fail to disable tap for vhost kernel");
-			return -1;
-		}
 		dev->qp_enabled[pair_idx] = false;
 		return 0;
 	}
 
-	if (dev->tapfds[pair_idx] >= 0) {
-		tapfd = dev->tapfds[pair_idx];
-		if (vhost_kernel_tap_set_offload(tapfd, dev->features) == -1)
-			return -1;
-		if (req_mq && vhost_kernel_tap_set_queue(tapfd, true) < 0) {
-			PMD_DRV_LOG(ERR, "fail to enable tap for vhost kernel");
-			return -1;
-		}
-		goto set_backend;
-	}
-
 	if ((dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF)) ||
 	    (dev->features & (1ULL << VIRTIO_F_VERSION_1)))
 		hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	else
 		hdr_size = sizeof(struct virtio_net_hdr);
 
-	tapfd = vhost_kernel_open_tap(&dev->ifname, hdr_size, req_mq,
-			 (char *)dev->mac_addr, dev->features);
-	if (tapfd < 0) {
-		PMD_DRV_LOG(ERR, "fail to open tap for vhost kernel");
+	/* Set mac on tap only once when starting */
+	if (!dev->started && pair_idx == 0 &&
+			tap_set_mac(data->tapfds[pair_idx], dev->mac_addr) < 0)
 		return -1;
-	}
 
-	dev->tapfds[pair_idx] = tapfd;
+	if (vhost_kernel_tap_setup(tapfd, hdr_size, dev->features) < 0) {
+		PMD_DRV_LOG(ERR, "fail to setup tap for vhost kernel");
+		return -1;
+	}
 
-set_backend:
 	if (vhost_kernel_set_backend(vhostfd, tapfd) < 0) {
 		PMD_DRV_LOG(ERR, "fail to set backend for vhost kernel");
 		return -1;
@@ -453,8 +577,23 @@ vhost_kernel_get_backend_features(uint64_t *features)
 	return 0;
 }
 
+static int
+vhost_kernel_update_link_state(struct virtio_user_dev *dev __rte_unused)
+{
+	/* Nothing to update (Maybe get TAP interface link state?) */
+	return 0;
+}
+
+static int
+vhost_kernel_get_intr_fd(struct virtio_user_dev *dev __rte_unused)
+{
+	/* No link state interrupt with Vhost-kernel */
+	return -1;
+}
+
 struct virtio_user_backend_ops virtio_ops_kernel = {
 	.setup = vhost_kernel_setup,
+	.destroy = vhost_kernel_destroy,
 	.get_backend_features = vhost_kernel_get_backend_features,
 	.set_owner = vhost_kernel_set_owner,
 	.get_features = vhost_kernel_get_features,
@@ -468,5 +607,7 @@ struct virtio_user_backend_ops virtio_ops_kernel = {
 	.set_vring_addr = vhost_kernel_set_vring_addr,
 	.get_status = vhost_kernel_get_status,
 	.set_status = vhost_kernel_set_status,
-	.enable_qp = vhost_kernel_enable_queue_pair
+	.enable_qp = vhost_kernel_enable_queue_pair,
+	.update_link_state = vhost_kernel_update_link_state,
+	.get_intr_fd = vhost_kernel_get_intr_fd,
 };