netdev - Re: [PATCH v2 net-next 01/12] net: dsa: implement a central TX reallocation procedure

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Date:   Sun, 1 Nov 2020 03:37:28 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org,
        andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        Christian Eggers <ceggers@...i.de>,
        Kurt Kanzenbach <kurt@...utronix.de>
Subject: Re: [PATCH v2 net-next 01/12] net: dsa: implement a central TX
 reallocation procedure

On Sun, Nov 01, 2020 at 03:14:34AM +0200, Vladimir Oltean wrote:
> On Sat, Oct 31, 2020 at 06:00:43PM -0700, Jakub Kicinski wrote:
> > On Fri, 30 Oct 2020 03:48:59 +0200 Vladimir Oltean wrote:
> > > @@ -567,6 +591,17 @@ static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
> > >  	 */
> > >  	dsa_skb_tx_timestamp(p, skb);
> > >  
> > > +	if (dsa_realloc_skb(skb, dev)) {
> > > +		kfree_skb(skb);
> > 
> > dev_kfree_skb_any()?
> 
> Just showing my ignorance, but where does the hardirq context come from?

I mean I do see that netpoll_send_udp requires IRQs disabled, but is
that the only reason why all drivers need to assume hardirq context in
.xmit, or are there more?