From: Junjie Wan <wanjunjie@bytedance.com>
Date: Tue, 2 Feb 2021 08:38:45 +0000 (+0800)
Subject: vhost: avoid IOTLB mempool allocation while IOMMU disabled
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=968bbc7e2e50;p=dpdk.git

vhost: avoid IOTLB mempool allocation while IOMMU disabled

If vhost device's IOMMU feature is disabled, IOTLB mempool allocation
is unnecessary.

Reported-by: Peng He <hepeng.0320@bytedance.com>
Signed-off-by: Junjie Wan <wanjunjie@bytedance.com>
Reviewed-by: Zhihong Wang <wangzhihong.wzh@bytedance.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index c9d1371e45..a70fe01d8f 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -365,7 +365,8 @@ free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq)
 		vhost_free_async_mem(vq);
 	}
 	rte_free(vq->batch_copy_elems);
-	rte_mempool_free(vq->iotlb_pool);
+	if (vq->iotlb_pool)
+		rte_mempool_free(vq->iotlb_pool);
 	rte_free(vq->log_cache);
 	rte_free(vq);
 }
@@ -569,8 +570,6 @@ init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 	vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
 	vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
 	vq->notif_enable = VIRTIO_UNINITIALIZED_NOTIF;
-
-	vhost_user_iotlb_init(dev, vring_idx);
 }
 
 static void
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 2f4f89aeac..cdd46a0116 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -469,6 +469,10 @@ vhost_user_set_vring_num(struct virtio_net **pdev,
 		return RTE_VHOST_MSG_RESULT_ERR;
 	}
 
+	if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
+		if (vhost_user_iotlb_init(dev, msg->payload.state.index))
+			return RTE_VHOST_MSG_RESULT_ERR;
+	}
 	return RTE_VHOST_MSG_RESULT_OK;
 }
 
@@ -574,7 +578,7 @@ out:
 	dev->virtqueue[index] = vq;
 	vhost_devices[dev->vid] = dev;
 
-	if (old_vq != vq)
+	if (old_vq != vq && (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
 		vhost_user_iotlb_init(dev, index);
 
 	return dev;