netdev - [PATCH v4 bpf-next 13/17] veth: implement ethtool's get

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Message-Id: <20210326230938.49998-14-maciej.fijalkowski@intel.com>
Date:   Sat, 27 Mar 2021 00:09:34 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org, daniel@...earbox.net,
        ast@...nel.org, andrii@...nel.org
Cc:     bjorn.topel@...el.com, magnus.karlsson@...el.com,
        ciara.loftus@...el.com, john.fastabend@...il.com, toke@...hat.com,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Subject: [PATCH v4 bpf-next 13/17] veth: implement ethtool's get_channels() callback

Libbpf's xsk part calls get_channels() API to retrieve the queue count
of the underlying driver so that XSKMAP is sized accordingly.

Implement that in veth so multi queue scenarios can work properly.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
---
 drivers/net/veth.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index aa1a66ad2ce5..180aabe8a33f 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -218,6 +218,17 @@ static void veth_get_ethtool_stats(struct net_device *dev,
 	}
 }
 
+static void veth_get_channels(struct net_device *dev,
+			      struct ethtool_channels *channels)
+{
+	channels->tx_count = dev->real_num_tx_queues;
+	channels->rx_count = dev->real_num_rx_queues;
+	channels->max_tx = dev->real_num_tx_queues;
+	channels->max_rx = dev->real_num_rx_queues;
+	channels->combined_count = min(dev->real_num_rx_queues, dev->real_num_tx_queues);
+	channels->max_combined = min(dev->real_num_rx_queues, dev->real_num_tx_queues);
+}
+
 static const struct ethtool_ops veth_ethtool_ops = {
 	.get_drvinfo		= veth_get_drvinfo,
 	.get_link		= ethtool_op_get_link,
@@ -226,6 +237,7 @@ static const struct ethtool_ops veth_ethtool_ops = {
 	.get_ethtool_stats	= veth_get_ethtool_stats,
 	.get_link_ksettings	= veth_get_link_ksettings,
 	.get_ts_info		= ethtool_op_get_ts_info,
+	.get_channels		= veth_get_channels,
 };
 
 /* general routines */
-- 
2.20.1