netdev - Re: [PATCHv2 net-next] bonding: add software tx timestamping support

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Date:   Fri, 7 Apr 2023 17:31:21 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org, Jay Vosburgh <j.vosburgh@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Toppins <jtoppins@...hat.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Liang Li <liali@...hat.com>,
        Miroslav Lichvar <mlichvar@...hat.com>
Subject: Re: [PATCHv2 net-next] bonding: add software tx timestamping support

On Fri, Apr 07, 2023 at 02:12:28PM +0800, Hangbin Liu wrote:
> Currently, bonding only obtain the timestamp (ts) information of
> the active slave, which is available only for modes 1, 5, and 6.
> For other modes, bonding only has software rx timestamping support.
> 
> However, some users who use modes such as LACP also want tx timestamp
> support. To address this issue, let's check the ts information of each
> slave. If all slaves support tx timestamping, we can enable tx
> timestamping support for the bond.
> 
> Suggested-by: Miroslav Lichvar <mlichvar@...hat.com>
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>

...

> @@ -5707,10 +5711,41 @@ static int bond_ethtool_get_ts_info(struct net_device *bond_dev,
>  			ret = ops->get_ts_info(real_dev, info);
>  			goto out;
>  		}
> +	} else {
> +		/* Check if all slaves support software rx/tx timestamping */
> +		rcu_read_lock();
> +		bond_for_each_slave_rcu(bond, slave, iter) {
> +			ret = -1;
> +			dev_hold(slave->dev);
> +			ops = slave->dev->ethtool_ops;
> +			phydev = slave->dev->phydev;
> +
> +			if (phy_has_tsinfo(phydev))
> +				ret = phy_ts_info(phydev, &ts_info);
> +			else if (ops->get_ts_info)
> +				ret = ops->get_ts_info(slave->dev, &ts_info);
> +
> +			if (!ret && (ts_info.so_timestamping & SOF_TIMESTAMPING_SOFTRXTX) == \

nit: no need for the '\' for line continuation.

> +				    SOF_TIMESTAMPING_SOFTRXTX) {
> +				dev_put(slave->dev);
> +				soft_support = true;
> +				continue;
> +			}
> +
> +			soft_support = false;
> +			dev_put(slave->dev);
> +			break;
> +		}
> +		rcu_read_unlock();
>  	}