linux-kernel - [RFC v2 Optimizing veth xsk performance 1/9] veth: Implement ethtool's get

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Date:   Mon,  7 Aug 2023 20:15:10 +0800
From:   Albert Huang <huangjie.albert@...edance.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Albert Huang <huangjie.albert@...edance.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [RFC v2 Optimizing veth xsk performance 1/9] veth: Implement ethtool's get_ringparam() callback

some xsk library calls get_ringparam() API to get the queue length
to init the xsk umem.

Implement that in veth so those scenarios can work properly.

Signed-off-by: Albert Huang <huangjie.albert@...edance.com>
---
 drivers/net/veth.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 614f3e3efab0..77e12d52ca2b 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -255,6 +255,17 @@ static void veth_get_channels(struct net_device *dev,
 static int veth_set_channels(struct net_device *dev,
 			     struct ethtool_channels *ch);
 
+static void veth_get_ringparam(struct net_device *dev,
+			       struct ethtool_ringparam *ring,
+			     struct kernel_ethtool_ringparam *kernel_ring,
+			     struct netlink_ext_ack *extack)
+{
+	ring->rx_max_pending = VETH_RING_SIZE;
+	ring->tx_max_pending = VETH_RING_SIZE;
+	ring->rx_pending = VETH_RING_SIZE;
+	ring->tx_pending = VETH_RING_SIZE;
+}
+
 static const struct ethtool_ops veth_ethtool_ops = {
 	.get_drvinfo		= veth_get_drvinfo,
 	.get_link		= ethtool_op_get_link,
@@ -265,6 +276,7 @@ static const struct ethtool_ops veth_ethtool_ops = {
 	.get_ts_info		= ethtool_op_get_ts_info,
 	.get_channels		= veth_get_channels,
 	.set_channels		= veth_set_channels,
+	.get_ringparam		= veth_get_ringparam,
 };
 
 /* general routines */
-- 
2.20.1