patches for DPDK stable branches
 help / color / mirror / Atom feed
From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: dev@dpdk.org, stable@dpdk.org, chenbo.xia@intel.com,
	amorenoz@redhat.com, jasowang@redhat.com,
	david.marchand@redhat.com
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
Subject: [dpdk-stable] [PATCH v3 2/2] net/virtio: fix memory init with vDPA backend
Date: Fri,  8 Jan 2021 10:41:49 +0100
Message-ID: <20210108094149.215384-3-maxime.coquelin@redhat.com> (raw)
In-Reply-To: <20210108094149.215384-1-maxime.coquelin@redhat.com>

This patch fixes an overhead met with mlx5-vdpa Kernel
driver, where for every page in the mapped area, all the
memory tables gets updated. For example, with 2MB hugepages,
a single IOTLB_UPDATE for a 1GB region causes 512 memory
updates on mlx5-vdpa side.

Using batching mode, the mlx5 driver will only trigger a
single memory update for all the IOTLB updates that happen
between the batch begin and batch end commands.

Fixes: 6b901437056e ("net/virtio: introduce vhost-vDPA backend")
Cc: stable@dpdk.org

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
---
 drivers/net/virtio/virtio_user/vhost.h        |   4 +
 drivers/net/virtio/virtio_user/vhost_vdpa.c   | 106 +++++++++++++++++-
 .../net/virtio/virtio_user/virtio_user_dev.c  |   3 +-
 3 files changed, 107 insertions(+), 6 deletions(-)

diff --git a/drivers/net/virtio/virtio_user/vhost.h b/drivers/net/virtio/virtio_user/vhost.h
index c1dcc50b58..be286173b0 100644
--- a/drivers/net/virtio/virtio_user/vhost.h
+++ b/drivers/net/virtio/virtio_user/vhost.h
@@ -90,6 +90,10 @@ enum vhost_user_request {
 #define VHOST_BACKEND_F_IOTLB_MSG_V2 1
 #endif
 
+#ifndef VHOST_BACKEND_F_IOTLB_BATCH
+#define VHOST_BACKEND_F_IOTLB_BATCH 2
+#endif
+
 extern const char * const vhost_msg_strings[VHOST_USER_MAX];
 
 struct vhost_memory_region {
diff --git a/drivers/net/virtio/virtio_user/vhost_vdpa.c b/drivers/net/virtio/virtio_user/vhost_vdpa.c
index 83c60ea660..004802b9eb 100644
--- a/drivers/net/virtio/virtio_user/vhost_vdpa.c
+++ b/drivers/net/virtio/virtio_user/vhost_vdpa.c
@@ -70,6 +70,8 @@ struct vhost_iotlb_msg {
 #define VHOST_IOTLB_UPDATE         2
 #define VHOST_IOTLB_INVALIDATE     3
 #define VHOST_IOTLB_ACCESS_FAIL    4
+#define VHOST_IOTLB_BATCH_BEGIN    5
+#define VHOST_IOTLB_BATCH_END      6
 	uint8_t type;
 };
 
@@ -84,6 +86,56 @@ struct vhost_msg {
 	};
 };
 
+static int
+vhost_vdpa_iotlb_batch_begin(struct virtio_user_dev *dev)
+{
+	struct vhost_msg msg = {};
+
+	if (!(dev->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_BATCH)))
+		return 0;
+
+	if (!(dev->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2))) {
+		PMD_DRV_LOG(ERR, "IOTLB_MSG_V2 not supported by the backend.");
+		return -1;
+	}
+
+	msg.type = VHOST_IOTLB_MSG_V2;
+	msg.iotlb.type = VHOST_IOTLB_BATCH_BEGIN;
+
+	if (write(dev->vhostfd, &msg, sizeof(msg)) != sizeof(msg)) {
+		PMD_DRV_LOG(ERR, "Failed to send IOTLB batch begin (%s)",
+				strerror(errno));
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+vhost_vdpa_iotlb_batch_end(struct virtio_user_dev *dev)
+{
+	struct vhost_msg msg = {};
+
+	if (!(dev->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_BATCH)))
+		return 0;
+
+	if (!(dev->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2))) {
+		PMD_DRV_LOG(ERR, "IOTLB_MSG_V2 not supported by the backend.");
+		return -1;
+	}
+
+	msg.type = VHOST_IOTLB_MSG_V2;
+	msg.iotlb.type = VHOST_IOTLB_BATCH_END;
+
+	if (write(dev->vhostfd, &msg, sizeof(msg)) != sizeof(msg)) {
+		PMD_DRV_LOG(ERR, "Failed to send IOTLB batch end (%s)",
+				strerror(errno));
+		return -1;
+	}
+
+	return 0;
+}
+
 static int
 vhost_vdpa_dma_map(struct virtio_user_dev *dev, void *addr,
 				  uint64_t iova, size_t len)
@@ -142,6 +194,39 @@ vhost_vdpa_dma_unmap(struct virtio_user_dev *dev, __rte_unused void *addr,
 	return 0;
 }
 
+static int
+vhost_vdpa_dma_map_batch(struct virtio_user_dev *dev, void *addr,
+				  uint64_t iova, size_t len)
+{
+	int ret;
+
+	if (vhost_vdpa_iotlb_batch_begin(dev) < 0)
+		return -1;
+
+	ret = vhost_vdpa_dma_map(dev, addr, iova, len);
+
+	if (vhost_vdpa_iotlb_batch_end(dev) < 0)
+		return -1;
+
+	return ret;
+}
+
+static int
+vhost_vdpa_dma_unmap_batch(struct virtio_user_dev *dev, void *addr,
+				  uint64_t iova, size_t len)
+{
+	int ret;
+
+	if (vhost_vdpa_iotlb_batch_begin(dev) < 0)
+		return -1;
+
+	ret = vhost_vdpa_dma_unmap(dev, addr, iova, len);
+
+	if (vhost_vdpa_iotlb_batch_end(dev) < 0)
+		return -1;
+
+	return ret;
+}
 
 static int
 vhost_vdpa_map_contig(const struct rte_memseg_list *msl,
@@ -179,21 +264,32 @@ vhost_vdpa_map(const struct rte_memseg_list *msl, const struct rte_memseg *ms,
 static int
 vhost_vdpa_dma_map_all(struct virtio_user_dev *dev)
 {
+	int ret;
+
+	if (vhost_vdpa_iotlb_batch_begin(dev) < 0)
+		return -1;
+
 	vhost_vdpa_dma_unmap(dev, NULL, 0, SIZE_MAX);
 
 	if (rte_eal_iova_mode() == RTE_IOVA_VA) {
 		/* with IOVA as VA mode, we can get away with mapping contiguous
 		 * chunks rather than going page-by-page.
 		 */
-		int ret = rte_memseg_contig_walk_thread_unsafe(
+		ret = rte_memseg_contig_walk_thread_unsafe(
 				vhost_vdpa_map_contig, dev);
 		if (ret)
-			return ret;
+			goto batch_end;
 		/* we have to continue the walk because we've skipped the
 		 * external segments during the config walk.
 		 */
 	}
-	return rte_memseg_walk_thread_unsafe(vhost_vdpa_map, dev);
+	ret = rte_memseg_walk_thread_unsafe(vhost_vdpa_map, dev);
+
+batch_end:
+	if (vhost_vdpa_iotlb_batch_end(dev) < 0)
+		return -1;
+
+	return ret;
 }
 
 /* with below features, vhost vdpa does not need to do the checksum and TSO,
@@ -313,6 +409,6 @@ struct virtio_user_backend_ops virtio_ops_vdpa = {
 	.setup = vhost_vdpa_setup,
 	.send_request = vhost_vdpa_ioctl,
 	.enable_qp = vhost_vdpa_enable_queue_pair,
-	.dma_map = vhost_vdpa_dma_map,
-	.dma_unmap = vhost_vdpa_dma_unmap,
+	.dma_map = vhost_vdpa_dma_map_batch,
+	.dma_unmap = vhost_vdpa_dma_unmap_batch,
 };
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index 39c5dfc9e4..202431ca22 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -446,7 +446,8 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
 	 1ULL << VHOST_USER_PROTOCOL_F_STATUS)
 
 #define VHOST_VDPA_SUPPORTED_PROTOCOL_FEATURES		\
-	(1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)
+	(1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2	|	\
+	1ULL << VHOST_BACKEND_F_IOTLB_BATCH)
 int
 virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
 		     int cq, int queue_size, const char *mac, char **ifname,
-- 
2.29.2


  parent reply	other threads:[~2021-01-08  9:42 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-08  9:41 [dpdk-stable] [PATCH v3 0/2] Vhost-vDPA fixes Maxime Coquelin
2021-01-08  9:41 ` [dpdk-stable] [PATCH v3 1/2] net/virtio: fix missing backend features negotiation Maxime Coquelin
2021-01-11  5:43   ` Xia, Chenbo
2021-01-08  9:41 ` Maxime Coquelin [this message]
2021-01-11 14:59 ` [dpdk-stable] [PATCH v3 0/2] Vhost-vDPA fixes Maxime Coquelin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210108094149.215384-3-maxime.coquelin@redhat.com \
    --to=maxime.coquelin@redhat.com \
    --cc=amorenoz@redhat.com \
    --cc=chenbo.xia@intel.com \
    --cc=david.marchand@redhat.com \
    --cc=dev@dpdk.org \
    --cc=jasowang@redhat.com \
    --cc=stable@dpdk.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

patches for DPDK stable branches

This inbox may be cloned and mirrored by anyone:

	git clone --mirror http://inbox.dpdk.org/stable/0 stable/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 stable stable/ http://inbox.dpdk.org/stable \
		stable@dpdk.org
	public-inbox-index stable

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.stable


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git