linux-kernel - [RFC Optimizing veth xsk performance 01/10] veth: Implement ethtool's get

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Message-Id: <20230803140441.53596-2-huangjie.albert@bytedance.com>
Date:   Thu,  3 Aug 2023 22:04:27 +0800
From:   "huangjie.albert" <huangjie.albert@...edance.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     "huangjie.albert" <huangjie.albert@...edance.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        Menglong Dong <imagedong@...cent.com>,
        Yunsheng Lin <linyunsheng@...wei.com>,
        Richard Gobert <richardbgobert@...il.com>,
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list),
        bpf@...r.kernel.org (open list:XDP (eXpress Data Path))
Subject: [RFC Optimizing veth xsk performance 01/10] veth: Implement ethtool's get_ringparam() callback

some xsk libary 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: huangjie.albert <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..c2b431a7a017 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