[dpdk-dev] [PATCH v7 05/11] vhost: checkout and cleanup the resubmit inflight information

[JinYu <jin.yu@intel.com>]

This patch shows how to checkout the inflight ring and construct
the resubmit information also include destroying resubmit info.

Signed-off-by: Lin Li <lilin24@baidu.com>
Signed-off-by: Xun Ni <nixun@baidu.com>
Signed-off-by: Yu Zhang <zhangyu31@baidu.com>
Signed-off-by: Jin Yu <jin.yu@intel.com>
---
 lib/librte_vhost/rte_vhost.h  |  19 ++++
 lib/librte_vhost/vhost.c      |  29 ++++-
 lib/librte_vhost/vhost.h      |   9 ++
 lib/librte_vhost/vhost_user.c | 197 ++++++++++++++++++++++++++++++++++
 4 files changed, 253 insertions(+), 1 deletion(-)

diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h
index 644b3e0d7..6ac738730 100644
--- a/lib/librte_vhost/rte_vhost.h
+++ b/lib/librte_vhost/rte_vhost.h
@@ -145,6 +145,25 @@ struct rte_vhost_inflight_info_packed {
 	struct rte_vhost_inflight_desc_packed desc[0];
 };
 
+struct rte_vhost_resubmit_desc {
+	uint16_t index;
+	uint64_t counter;
+};
+
+struct rte_vhost_resubmit_info {
+	struct rte_vhost_resubmit_desc *resubmit_list;
+	uint16_t resubmit_num;
+};
+
+struct rte_vhost_ring_inflight {
+	union {
+		struct rte_vhost_inflight_info_split *inflight_split;
+		struct rte_vhost_inflight_info_packed *inflight_packed;
+	};
+
+	struct rte_vhost_resubmit_info *resubmit_inflight;
+};
+
 struct rte_vhost_vring {
 	union {
 		struct vring_desc *desc;
diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 981837b5d..660ac2a07 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -242,6 +242,31 @@ cleanup_vq(struct vhost_virtqueue *vq, int destroy)
 		close(vq->kickfd);
 }
 
+void
+cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+	if (!(dev->protocol_features &
+		(1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
+		return;
+
+	if (vq_is_packed(dev)) {
+		if (vq->inflight_packed)
+			vq->inflight_packed = NULL;
+	} else {
+		if (vq->inflight_split)
+			vq->inflight_split = NULL;
+	}
+
+	if (vq->resubmit_inflight) {
+		if (vq->resubmit_inflight->resubmit_list) {
+			free(vq->resubmit_inflight->resubmit_list);
+			vq->resubmit_inflight->resubmit_list = NULL;
+		}
+		free(vq->resubmit_inflight);
+		vq->resubmit_inflight = NULL;
+	}
+}
+
 /*
  * Unmap any memory, close any file descriptors and
  * free any memory owned by a device.
@@ -253,8 +278,10 @@ cleanup_device(struct virtio_net *dev, int destroy)
 
 	vhost_backend_cleanup(dev);
 
-	for (i = 0; i < dev->nr_vring; i++)
+	for (i = 0; i < dev->nr_vring; i++) {
 		cleanup_vq(dev->virtqueue[i], destroy);
+		cleanup_vq_inflight(dev, dev->virtqueue[i]);
+	}
 }
 
 void
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index d67ba849a..ab95999c4 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -128,6 +128,14 @@ struct vhost_virtqueue {
 	/* Physical address of used ring, for logging */
 	uint64_t		log_guest_addr;
 
+	/* inflight share memory info */
+	union {
+		struct rte_vhost_inflight_info_split *inflight_split;
+		struct rte_vhost_inflight_info_packed *inflight_packed;
+	};
+	struct rte_vhost_resubmit_info *resubmit_inflight;
+	uint64_t		global_counter;
+
 	uint16_t		nr_zmbuf;
 	uint16_t		zmbuf_size;
 	uint16_t		last_zmbuf_idx;
@@ -474,6 +482,7 @@ void vhost_destroy_device(int);
 void vhost_destroy_device_notify(struct virtio_net *dev);
 
 void cleanup_vq(struct vhost_virtqueue *vq, int destroy);
+void cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq);
 void free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq);
 
 int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx);
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index ad2d36215..e73b9028a 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -336,6 +336,7 @@ vhost_user_set_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
 
 			dev->virtqueue[dev->nr_vring] = NULL;
 			cleanup_vq(vq, 1);
+			cleanup_vq_inflight(dev, vq);
 			free_vq(dev, vq);
 		}
 	}
@@ -1468,6 +1469,188 @@ static int vhost_user_set_vring_err(struct virtio_net **pdev __rte_unused,
 	return RTE_VHOST_MSG_RESULT_OK;
 }
 
+static int
+resubmit_desc_compare(const void *a, const void *b)
+{
+	const struct rte_vhost_resubmit_desc *desc0 =
+		(const struct rte_vhost_resubmit_desc *)a;
+	const struct rte_vhost_resubmit_desc *desc1 =
+		(const struct rte_vhost_resubmit_desc *)b;
+
+	if (desc1->counter > desc0->counter &&
+		(desc1->counter - desc0->counter) < VIRTQUEUE_MAX_SIZE * 2)
+		return 1;
+
+	return -1;
+}
+
+static int
+vhost_check_queue_inflights_split(struct virtio_net *dev,
+	struct vhost_virtqueue *vq)
+{
+	uint16_t i = 0;
+	uint16_t resubmit_num = 0, last_io, num;
+	struct vring_used *used = vq->used;
+	struct rte_vhost_resubmit_info *resubmit = NULL;
+	struct rte_vhost_inflight_info_split *inflight_split;
+
+	if (!(dev->protocol_features &
+		(1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
+		return RTE_VHOST_MSG_RESULT_OK;
+
+	if ((!vq->inflight_split))
+		return RTE_VHOST_MSG_RESULT_ERR;
+
+	if (!vq->inflight_split->version) {
+		vq->inflight_split->version = INFLIGHT_VERSION;
+		return RTE_VHOST_MSG_RESULT_OK;
+	}
+
+	inflight_split = vq->inflight_split;
+	vq->resubmit_inflight = NULL;
+	vq->global_counter = 0;
+	last_io = inflight_split->last_inflight_io;
+
+	if (inflight_split->used_idx != used->idx) {
+		inflight_split->desc[last_io].inflight = 0;
+		rte_compiler_barrier();
+		inflight_split->used_idx = used->idx;
+	}
+
+	for (i = 0; i < inflight_split->desc_num; i++) {
+		if (inflight_split->desc[i].inflight == 1)
+			resubmit_num++;
+	}
+
+	vq->last_avail_idx += resubmit_num;
+
+	if (resubmit_num) {
+		resubmit  = calloc(1, sizeof(struct rte_vhost_resubmit_info));
+		if (!resubmit) {
+			RTE_LOG(ERR, VHOST_CONFIG,
+			 "Failed to allocate memory for resubmit info.\n");
+			return RTE_VHOST_MSG_RESULT_ERR;
+		}
+
+		resubmit->resubmit_list = calloc(resubmit_num,
+			sizeof(struct rte_vhost_resubmit_desc));
+		if (!resubmit->resubmit_list) {
+			RTE_LOG(ERR, VHOST_CONFIG,
+			 "Failed to allocate memory for inflight desc.\n");
+			return RTE_VHOST_MSG_RESULT_ERR;
+		}
+
+		num = 0;
+		for (i = 0; i < vq->inflight_split->desc_num; i++) {
+			if (vq->inflight_split->desc[i].inflight == 1) {
+				resubmit->resubmit_list[num].index = i;
+				resubmit->resubmit_list[num].counter =
+					inflight_split->desc[i].counter;
+				num++;
+			}
+		}
+		resubmit->resubmit_num = num;
+
+		if (resubmit->resubmit_num > 1)
+			qsort(resubmit->resubmit_list, resubmit->resubmit_num,
+				sizeof(struct rte_vhost_resubmit_desc),
+				resubmit_desc_compare);
+
+		vq->global_counter = resubmit->resubmit_list[0].counter + 1;
+		vq->resubmit_inflight = resubmit;
+	}
+
+	return RTE_VHOST_MSG_RESULT_OK;
+}
+
+static int
+vhost_check_queue_inflights_packed(struct virtio_net *dev,
+						 struct vhost_virtqueue *vq)
+{
+	uint16_t i = 0;
+	uint16_t resubmit_num = 0, old_used_idx, num;
+	struct rte_vhost_resubmit_info *resubmit = NULL;
+	struct rte_vhost_inflight_info_packed *inflight_packed;
+
+	if (!(dev->protocol_features &
+		(1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
+		return RTE_VHOST_MSG_RESULT_OK;
+
+	if ((!vq->inflight_packed))
+		return RTE_VHOST_MSG_RESULT_ERR;
+
+	if (!vq->inflight_packed->version) {
+		vq->inflight_packed->version = INFLIGHT_VERSION;
+		return RTE_VHOST_MSG_RESULT_OK;
+	}
+
+	inflight_packed = vq->inflight_packed;
+	vq->resubmit_inflight = NULL;
+	vq->global_counter = 0;
+	old_used_idx = inflight_packed->old_used_idx;
+
+	if (inflight_packed->used_idx != old_used_idx) {
+		if (inflight_packed->desc[old_used_idx].inflight == 0) {
+			inflight_packed->old_used_idx =
+				inflight_packed->used_idx;
+			inflight_packed->old_used_wrap_counter =
+				inflight_packed->used_wrap_counter;
+			inflight_packed->old_free_head =
+				inflight_packed->free_head;
+		} else {
+			inflight_packed->used_idx =
+				inflight_packed->old_used_idx;
+			inflight_packed->used_wrap_counter =
+				inflight_packed->old_used_wrap_counter;
+			inflight_packed->free_head =
+				inflight_packed->old_free_head;
+		}
+	}
+
+	for (i = 0; i < inflight_packed->desc_num; i++) {
+		if (inflight_packed->desc[i].inflight == 1)
+			resubmit_num++;
+	}
+
+	if (resubmit_num) {
+		resubmit = calloc(1, sizeof(struct rte_vhost_resubmit_info));
+		if (resubmit == NULL) {
+			RTE_LOG(ERR, VHOST_CONFIG,
+			 "Failed to allocate memory for resubmit info.\n");
+			return RTE_VHOST_MSG_RESULT_ERR;
+		}
+
+		resubmit->resubmit_list = calloc(resubmit_num,
+			sizeof(struct rte_vhost_resubmit_desc));
+		if (resubmit->resubmit_list == NULL) {
+			RTE_LOG(ERR, VHOST_CONFIG,
+			 "Failed to allocate memory for resubmit desc.\n");
+			return RTE_VHOST_MSG_RESULT_ERR;
+		}
+
+		num = 0;
+		for (i = 0; i < inflight_packed->desc_num; i++) {
+			if (vq->inflight_packed->desc[i].inflight == 1) {
+				resubmit->resubmit_list[num].index = i;
+				resubmit->resubmit_list[num].counter =
+					inflight_packed->desc[i].counter;
+				num++;
+			}
+		}
+		resubmit->resubmit_num = num;
+
+		if (resubmit->resubmit_num > 1)
+			qsort(resubmit->resubmit_list, resubmit->resubmit_num,
+				sizeof(struct rte_vhost_resubmit_desc),
+				resubmit_desc_compare);
+
+		vq->global_counter = resubmit->resubmit_list[0].counter + 1;
+		vq->resubmit_inflight = resubmit;
+	}
+
+	return RTE_VHOST_MSG_RESULT_OK;
+}
+
 static int
 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg,
 			int main_fd __rte_unused)
@@ -1509,6 +1692,20 @@ vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg,
 		close(vq->kickfd);
 	vq->kickfd = file.fd;
 
+	if (vq_is_packed(dev)) {
+		if (vhost_check_queue_inflights_packed(dev, vq)) {
+			RTE_LOG(ERR, VHOST_CONFIG,
+				"Failed to inflights for vq: %d\n", file.index);
+			return RTE_VHOST_MSG_RESULT_ERR;
+		}
+	} else {
+		if (vhost_check_queue_inflights_split(dev, vq)) {
+			RTE_LOG(ERR, VHOST_CONFIG,
+				"Failed to inflights for vq: %d\n", file.index);
+			return RTE_VHOST_MSG_RESULT_ERR;
+		}
+	}
+
 	return RTE_VHOST_MSG_RESULT_OK;
 }
 
-- 
2.17.2