Re: [PATCH v7 25/26] virtio_net: set the default max ring size by find_vqs()

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在 2022/3/8 下午8:35, Xuan Zhuo 写道:
Use virtio_find_vqs_ctx_size() to specify the maximum ring size of tx,
rx at the same time.

                          | rx/tx ring size
-------------------------------------------
speed == UNKNOWN or < 10G| 1024
speed < 40G              | 4096
speed >= 40G             | 8192

Call virtnet_update_settings() once before calling init_vqs() to update
speed.

Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
---
  drivers/net/virtio_net.c | 42 ++++++++++++++++++++++++++++++++++++----
  1 file changed, 38 insertions(+), 4 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index ffff323dcef0..f1bdc6ce21c3 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2977,6 +2977,29 @@ static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqu
  		   (unsigned int)GOOD_PACKET_LEN);
  }
+static void virtnet_config_sizes(struct virtnet_info *vi, u32 *sizes)
+{
+	u32 i, rx_size, tx_size;
+
+	if (vi->speed == SPEED_UNKNOWN || vi->speed < SPEED_10000) {
+		rx_size = 1024;
+		tx_size = 1024;
+
+	} else if (vi->speed < SPEED_40000) {
+		rx_size = 1024 * 4;
+		tx_size = 1024 * 4;
+
+	} else {
+		rx_size = 1024 * 8;
+		tx_size = 1024 * 8;
+	}
+
+	for (i = 0; i < vi->max_queue_pairs; i++) {
+		sizes[rxq2vq(i)] = rx_size;
+		sizes[txq2vq(i)] = tx_size;
+	}
+}
+
  static int virtnet_find_vqs(struct virtnet_info *vi)
  {
  	vq_callback_t **callbacks;
@@ -2984,6 +3007,7 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
  	int ret = -ENOMEM;
  	int i, total_vqs;
  	const char **names;
+	u32 *sizes;
  	bool *ctx;
/* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
@@ -3011,10 +3035,15 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
  		ctx = NULL;
  	}
+ sizes = kmalloc_array(total_vqs, sizeof(*sizes), GFP_KERNEL);
+	if (!sizes)
+		goto err_sizes;
+
  	/* Parameters for control virtqueue, if any */
  	if (vi->has_cvq) {
  		callbacks[total_vqs - 1] = NULL;
  		names[total_vqs - 1] = "control";
+		sizes[total_vqs - 1] = 0;


Nit: Do we need a sane value for the control vq? (e.g 64)

Thanks


  	}
/* Allocate/initialize parameters for send/receive virtqueues */
@@ -3029,8 +3058,10 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
  			ctx[rxq2vq(i)] = true;
  	}
- ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks,
-				  names, ctx, NULL);
+	virtnet_config_sizes(vi, sizes);
+
+	ret = virtio_find_vqs_ctx_size(vi->vdev, total_vqs, vqs, callbacks,
+				       names, ctx, NULL, sizes);
  	if (ret)
  		goto err_find;
@@ -3050,6 +3081,8 @@ static int virtnet_find_vqs(struct virtnet_info *vi) err_find:
+	kfree(sizes);
+err_sizes:
  	kfree(ctx);
  err_ctx:
  	kfree(names);
@@ -3368,6 +3401,9 @@ static int virtnet_probe(struct virtio_device *vdev)
  		vi->curr_queue_pairs = num_online_cpus();
  	vi->max_queue_pairs = max_queue_pairs;
+ virtnet_init_settings(dev);
+	virtnet_update_settings(vi);
+
  	/* Allocate/initialize the rx/tx queues, and invoke find_vqs */
  	err = init_vqs(vi);
  	if (err)
@@ -3380,8 +3416,6 @@ static int virtnet_probe(struct virtio_device *vdev)
  	netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
  	netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
- virtnet_init_settings(dev);
-
  	if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
  		vi->failover = net_failover_create(vi->dev);
  		if (IS_ERR(vi->failover)) {




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