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

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Date:	Sat, 5 Jun 2010 01:53:25 -0700
From:	Ramkrishna Vepa <Ramkrishna.Vepa@...r.com>
To:	Michal Schmidt <mschmidt@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	Amerigo Wang <amwang@...hat.com>,
	"herbert.xu@...hat.com" <herbert.xu@...hat.com>,
	"nhorman@...hat.com" <nhorman@...hat.com>,
	"sgruszka@...hat.com" <sgruszka@...hat.com>,
	"davem@...emloft.net" <davem@...emloft.net>
Subject: RE: [Patch 1/2] s2io: add dynamic LRO disable support

> +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);
In s2io_card_up, update ring->lro too as it is used in the fast path -
		struct ring_info *ring = &mac_control->rings[i];
 
 		ring->mtu = dev->mtu;
+		ring->lro = sp->lro;

> +		s2io_start_all_tx_queue(sp);

The following line in init_shared_mem() is redundant and can be removed.
-	ring->lro = lro_enable;

Thanks,
Ram
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