netdev - Re: [PATCH] bnx2: avoid flushing statistics when doing a MTU change

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Date:	Mon, 30 Nov 2009 11:30:42 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	leitao@...ux.vnet.ibm.com
CC:	netdev@...r.kernel.org, mchan@...adcom.com
Subject: Re: [PATCH] bnx2: avoid flushing statistics when doing a MTU change

leitao@...ux.vnet.ibm.com a écrit :
> Actually when bnx2 changes the interface's MTU size, it resets
> the chip and consequently flushes the interface statistics.
> This patch saves the statistics in a temporary space in order to
> maintain the statistics correct after the chip reset.
> 
> Signed-off-by: Breno Leitao<leitao@...ux.vnet.ibm.com>


  
>  	return net_stats;
>  }
> @@ -6989,6 +7004,11 @@ bnx2_change_ring_size(struct bnx2 *bp, u32 rx, u32 tx)
>  {
>  	if (netif_running(bp->dev)) {
>  		bnx2_netif_stop(bp);

I wonder if you need to renew this stats before copying them ?
 (eg calling bnx2_get_stats())


> +
> +		/* Save statistics that is going to be reseted */
> +		memcpy(bp->stats_extra, &bp->dev->stats,
> +			sizeof(struct net_device_stats));
> +
>  		bnx2_reset_chip(bp, BNX2_DRV_MSG_CODE_RESET);
>  		bnx2_free_skbs(bp);
>  		bnx2_free_mem(bp);
> @@ -7649,6 +7669,7 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
>  
>  	bp->flags = 0;
>  	bp->phy_flags = 0;
> +	bp->stats_extra = kzalloc(sizeof(struct net_device_stats), GFP_KERNEL);

There is no test of failed allocation.

>  
>  	/* enable device (incl. PCI PM wakeup), and bus-mastering */
>  	rc = pci_enable_device(pdev);
> @@ -8162,6 +8183,7 @@ bnx2_remove_one(struct pci_dev *pdev)
>  	if (bp->regview)
>  		iounmap(bp->regview);
>  
> +	kfree(bp->stats_extra);
>  	free_netdev(dev);
>  	pci_release_regions(pdev);
>  	pci_disable_device(pdev);

Structure is small anyway, why not including it in struct bnx2 ?
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