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Message-ID: <82a26c8f-d2d0-4479-b3b0-ec853517e2f9@machnikowski.net>
Date: Thu, 29 Feb 2024 18:19:49 +0100
From: Maciek Machnikowski <maciek@...hnikowski.net>
To: David Wei <dw@...idwei.uk>, Jakub Kicinski <kuba@...nel.org>,
Jiri Pirko <jiri@...nulli.us>, Sabrina Dubroca <sd@...asysnail.net>,
horms@...nel.org, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH v14 3/5] netdevsim: add ndo_get_iflink() implementation
On 29/02/2024 00:22, David Wei wrote:
> Add an implementation for ndo_get_iflink() in netdevsim that shows the
> ifindex of the linked peer, if any.
>
> Signed-off-by: David Wei <dw@...idwei.uk>
> ---
> drivers/net/netdevsim/netdev.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
> index c3f3fda5fdc0..8330bc0bcb7e 100644
> --- a/drivers/net/netdevsim/netdev.c
> +++ b/drivers/net/netdevsim/netdev.c
> @@ -283,6 +283,21 @@ nsim_set_features(struct net_device *dev, netdev_features_t features)
> return 0;
> }
>
> +static int nsim_get_iflink(const struct net_device *dev)
> +{
> + struct netdevsim *nsim, *peer;
> + int iflink;
> +
> + nsim = netdev_priv(dev);
> +
> + rcu_read_lock();
> + peer = rcu_dereference(nsim->peer);
> + iflink = peer ? READ_ONCE(peer->netdev->ifindex) : 0;
> + rcu_read_unlock();
> +
> + return iflink;
> +}
> +
> static const struct net_device_ops nsim_netdev_ops = {
> .ndo_start_xmit = nsim_start_xmit,
> .ndo_set_rx_mode = nsim_set_rx_mode,
> @@ -300,6 +315,7 @@ static const struct net_device_ops nsim_netdev_ops = {
> .ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
> .ndo_setup_tc = nsim_setup_tc,
> .ndo_set_features = nsim_set_features,
> + .ndo_get_iflink = nsim_get_iflink,
> .ndo_bpf = nsim_bpf,
> };
>
Reviewed-by: Maciek Machnikowski <maciek@...hnikowski.net>
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