netdev - RE: [v2 Patch 1/2] s2io: add dynamic LRO disable support

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Date:	Tue, 15 Jun 2010 09:07:47 -0700
From:	Ramkrishna Vepa <Ramkrishna.Vepa@...r.com>
To:	Cong Wang <amwang@...hat.com>
CC:	Ben Hutchings <bhutchings@...arflare.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"nhorman@...hat.com" <nhorman@...hat.com>,
	"sgruszka@...hat.com" <sgruszka@...hat.com>,
	"herbert.xu@...hat.com" <herbert.xu@...hat.com>,
	"davem@...emloft.net" <davem@...emloft.net>
Subject: RE: [v2 Patch 1/2] s2io: add dynamic LRO disable support

> >> On Wed, 2010-06-09 at 06:05 -0400, Amerigo Wang wrote:
> >> [...]
> >>> +static int s2io_ethtool_set_flags(struct net_device *dev, u32 data)
> >>> +{
> >>> +   struct s2io_nic *sp = netdev_priv(dev);
> >>> +   int rc = 0;
> >>> +   int changed = 0;
> >>> +
> >>> +   if (data&  ETH_FLAG_LRO) {
> >>> +           if (lro_enable) {
> >>> +                   if (!(dev->features&  NETIF_F_LRO)) {
> >>> +                           dev->features |= NETIF_F_LRO;
> >>> +                           changed = 1;
> >>> +                   }
> >>> +           } else
> >>> +                   rc = -EINVAL;
> >>> +   } else if (dev->features&  NETIF_F_LRO) {
> >>> +           dev->features&= ~NETIF_F_LRO;
> >>> +           changed = 1;
> >>> +   }
> >>> +
> >>> +   if (changed&&  netif_running(dev)) {
> >>> +           s2io_stop_all_tx_queue(sp);
> >>> +           s2io_card_down(sp);
> >>> +           sp->lro = dev->features&  NETIF_F_LRO;
> >>> +           rc = s2io_card_up(sp);
> >>> +           s2io_start_all_tx_queue(sp);
> >> [...]
> >>
> >> Is it safe to call s2io_start_all_tx_queue() if s2io_card_up() failed?
> > Ben,
> > Good point. If s2io_card_up() fails the chip will not be accessed, so
> it's safe but all transmit skbs will be freed without the user knowing the
> reason for failing to transmit or receive for that matter.  The other
> option is to return with a failure and get the watchdog timer reset the
> adapter.
> >
>
> (Sorry for the delay, I was on vacation.)
>
> So it seems the latter option is better?
Yes, this will work.

Thanks,
Ram

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