netdev - [PATCH net-next v3 5/5] virtio-net: return -EOPNOTSUPP for adaptive-tx

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Date: Tue, 14 Nov 2023 13:55:47 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Cc: Jason Wang <jasowang@...hat.com>,
	"Michael S . Tsirkin" <mst@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Simon Horman <horms@...nel.org>,
	Jakub Kicinski <kuba@...nel.org>,
	xuanzhuo@...ux.alibaba.com
Subject: [PATCH net-next v3 5/5] virtio-net: return -EOPNOTSUPP for adaptive-tx

We do not currently support tx dim, so respond to -EOPNOTSUPP.

Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
---
v1->v2:
- Use -EOPNOTSUPP instead of specific implementation.

 drivers/net/virtio_net.c | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index bc32d5aae005..b082f2acbb22 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3364,9 +3364,15 @@ static int virtnet_get_link_ksettings(struct net_device *dev,
 static int virtnet_send_tx_notf_coal_cmds(struct virtnet_info *vi,
 					  struct ethtool_coalesce *ec)
 {
+	bool tx_ctrl_dim_on = !!ec->use_adaptive_tx_coalesce;
 	struct scatterlist sgs_tx;
 	int i;
 
+	if (tx_ctrl_dim_on) {
+		pr_debug("Failed to enable adaptive-tx, which is not supported\n");
+		return -EOPNOTSUPP;
+	}
+
 	vi->ctrl->coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs);
 	vi->ctrl->coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames);
 	sg_init_one(&sgs_tx, &vi->ctrl->coal_tx, sizeof(vi->ctrl->coal_tx));
@@ -3501,6 +3507,25 @@ static int virtnet_send_rx_notf_coal_vq_cmds(struct virtnet_info *vi,
 	return 0;
 }
 
+static int virtnet_send_tx_notf_coal_vq_cmds(struct virtnet_info *vi,
+					     struct ethtool_coalesce *ec,
+					     u16 queue)
+{
+	bool tx_ctrl_dim_on = !!ec->use_adaptive_tx_coalesce;
+	int err;
+
+	if (tx_ctrl_dim_on) {
+		pr_debug("Enabling adaptive-tx for txq%d is not supported\n", queue);
+		return -EOPNOTSUPP;
+	}
+
+	err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, queue,
+					       ec->tx_coalesce_usecs,
+					       ec->tx_max_coalesced_frames);
+
+	return err;
+}
+
 static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
 					  struct ethtool_coalesce *ec,
 					  u16 queue)
@@ -3511,9 +3536,7 @@ static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
 	if (err)
 		return err;
 
-	err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, queue,
-					       ec->tx_coalesce_usecs,
-					       ec->tx_max_coalesced_frames);
+	err = virtnet_send_tx_notf_coal_vq_cmds(vi, ec, queue);
 	if (err)
 		return err;
 
-- 
2.19.1.6.gb485710b