In order to be able to handle other ports or queues while waiting
for an IOTLB miss reply, a pending list is created so that waiter
can return and restart later on with sending again a miss request.
Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
---
lib/librte_vhost/iotlb.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++--
lib/librte_vhost/iotlb.h | 4 +++
lib/librte_vhost/vhost.h | 1 +
3 files changed, 91 insertions(+), 2 deletions(-)
diff --git a/lib/librte_vhost/iotlb.c b/lib/librte_vhost/iotlb.c
index 1b739dae5..d014bfe98 100644
--- a/lib/librte_vhost/iotlb.c
+++ b/lib/librte_vhost/iotlb.c
@@ -49,7 +49,86 @@ struct vhost_iotlb_entry {
uint8_t perm;
};
-#define IOTLB_CACHE_SIZE 1024
+#define IOTLB_CACHE_SIZE 2048
+
+static void vhost_user_iotlb_pending_remove_all(struct vhost_virtqueue *vq)
+{
+ struct vhost_iotlb_entry *node, *temp_node;
+
+ rte_rwlock_write_lock(&vq->iotlb_lock);
+
+ TAILQ_FOREACH_SAFE(node, &vq->iotlb_pending_list, next, temp_node) {
+ TAILQ_REMOVE(&vq->iotlb_pending_list, node, next);
+ rte_mempool_put(vq->iotlb_pool, node);
+ }
+
+ rte_rwlock_write_unlock(&vq->iotlb_lock);
+}
+
+int vhost_user_iotlb_pending_miss(struct vhost_virtqueue *vq, uint64_t iova,
+ uint8_t perm)
+{
+ struct vhost_iotlb_entry *node;
+ int found = 0;
+
+ rte_rwlock_read_lock(&vq->iotlb_lock);
+
+ TAILQ_FOREACH(node, &vq->iotlb_pending_list, next) {
+ if ((node->iova == iova) && (node->perm == perm)) {
+ found = 1;
+ break;
+ }
+ }
+
+ rte_rwlock_read_unlock(&vq->iotlb_lock);
+
+ return found;
+}
+
+void vhost_user_iotlb_pending_insert(struct vhost_virtqueue *vq,
+ uint64_t iova, uint8_t perm)
+{
+ struct vhost_iotlb_entry *node;
+ int ret;
+
+ ret = rte_mempool_get(vq->iotlb_pool, (void **)&node);
+ if (ret) {
+ RTE_LOG(ERR, VHOST_CONFIG, "IOTLB pool empty, invalidate
cache\n");
+ vhost_user_iotlb_pending_remove_all(vq);
+ ret = rte_mempool_get(vq->iotlb_pool, (void **)&node);
+ if (ret) {
+ RTE_LOG(ERR, VHOST_CONFIG, "IOTLB pool still empty,
failure\n");
+ return;
+ }
+ }
+
+ node->iova = iova;
+ node->perm = perm;
+
+ rte_rwlock_write_lock(&vq->iotlb_lock);
+
+ TAILQ_INSERT_TAIL(&vq->iotlb_pending_list, node, next);
+
+ rte_rwlock_write_unlock(&vq->iotlb_lock);
+}
+
+static void vhost_user_iotlb_pending_remove(struct vhost_virtqueue *vq,
+ uint64_t iova, uint64_t size, uint8_t perm)
+{
+ struct vhost_iotlb_entry *node, *temp_node;
+
+ /* .iotlb_lock already locked by the caller */
+ TAILQ_FOREACH_SAFE(node, &vq->iotlb_pending_list, next, temp_node) {
+ if (node->iova < iova)
+ continue;
+ if (node->iova >= iova + size)
+ continue;
+ if ((node->perm & perm) != node->perm)
+ continue;
+ TAILQ_REMOVE(&vq->iotlb_pending_list, node, next);
+ rte_mempool_put(vq->iotlb_pool, node);
+ }
+}
static void vhost_user_iotlb_cache_remove_all(struct vhost_virtqueue *vq)
{
@@ -106,7 +185,10 @@ void vhost_user_iotlb_cache_insert(struct vhost_virtqueue
*vq, uint64_t iova,
TAILQ_INSERT_TAIL(&vq->iotlb_list, new_node, next);
unlock:
+ vhost_user_iotlb_pending_remove(vq, iova, size, perm);
+
rte_rwlock_write_unlock(&vq->iotlb_lock);
+
}
void vhost_user_iotlb_cache_remove(struct vhost_virtqueue *vq,
@@ -189,9 +271,10 @@ int vhost_user_iotlb_init(struct virtio_net *dev, int
vq_index)
if (vq->iotlb_pool) {
/*
* The cache has already been initialized,
- * just drop all entries
+ * just drop all cached and pending entries.
*/
vhost_user_iotlb_cache_remove_all(vq);
+ vhost_user_iotlb_pending_remove_all(vq);
return 0;
}
@@ -204,6 +287,7 @@ int vhost_user_iotlb_init(struct virtio_net *dev, int
vq_index)
rte_rwlock_init(&vq->iotlb_lock);
TAILQ_INIT(&vq->iotlb_list);
+ TAILQ_INIT(&vq->iotlb_pending_list);
snprintf(pool_name, sizeof(pool_name), "iotlb_cache_%d_%d",
dev->vid, vq_index);
diff --git a/lib/librte_vhost/iotlb.h b/lib/librte_vhost/iotlb.h
index 459820762..4be1f7e85 100644
--- a/lib/librte_vhost/iotlb.h
+++ b/lib/librte_vhost/iotlb.h
@@ -41,6 +41,10 @@ void vhost_user_iotlb_cache_remove(struct vhost_virtqueue
*vq,
uint64_t iova, uint64_t size);
uint64_t vhost_user_iotlb_cache_find(struct vhost_virtqueue *vq, uint64_t iova,
uint64_t *size, uint8_t perm);
+int vhost_user_iotlb_pending_miss(struct vhost_virtqueue *vq, uint64_t iova,
+ uint8_t perm);
+void vhost_user_iotlb_pending_insert(struct vhost_virtqueue *vq, uint64_t iova,
+ uint8_t perm);
int vhost_user_iotlb_init(struct virtio_net *dev, int vq_index);
#endif /* _VHOST_IOTLB_H_ */
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 7816a92b5..a41bacea7 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -119,6 +119,7 @@ struct vhost_virtqueue {
rte_rwlock_t iotlb_lock;
struct rte_mempool *iotlb_pool;
TAILQ_HEAD(, vhost_iotlb_entry) iotlb_list;
+ TAILQ_HEAD(, vhost_iotlb_entry) iotlb_pending_list;
} __rte_cache_aligned;
/* Old kernels have no such macros defined */
--
2.13.3
