netdev - Re: [PATCH net-next 2/6] net: dsa: export the dsa_port_is

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Date:   Mon, 21 Jun 2021 15:55:12 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net-next 2/6] net: dsa: export the
 dsa_port_is_{user,cpu,dsa} helpers

On Fri, Jun 18, 2021 at 09:30:13PM +0300, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> The difference between dsa_is_user_port and dsa_port_is_user is that the
> former needs to look up the list of ports of the DSA switch tree in
> order to find the struct dsa_port, while the latter directly receives it
> as an argument.
> 
> dsa_is_user_port is already in widespread use and has its place, so
> there isn't any chance of converting all callers to a single form.
> But being able to do:
> 	dsa_port_is_user(dp)
> instead of
> 	dsa_is_user_port(dp->ds, dp->index)
> 
> is much more efficient too, especially when the "dp" comes from an
> iterator over the DSA switch tree - this reduces the complexity from
> quadratic to linear.
> 
> Move these helpers from dsa2.c to include/net/dsa.h so that others can
> use them too.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew