netdev - Re: [Intel-wired-lan] [PATCH 1/2] e1000e: Don't return uninitialized stats

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Message-ID: <caef8d69-9e47-bbcc-0758-e5900e1cb291@intel.com>
Date:   Mon, 24 Apr 2017 11:17:39 +0300
From:   "Neftin, Sasha" <sasha.neftin@...el.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     intel-wired-lan@...ts.osuosl.org,
        "Ruinskiy, Dima" <dima.ruinskiy@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH 1/2] e1000e: Don't return uninitialized
 stats

On 4/23/2017 15:53, Neftin, Sasha wrote:
> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@...ts.osuosl.org] On Behalf Of Benjamin Poirier
> Sent: Saturday, April 22, 2017 00:20
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>
> Cc: netdev@...r.kernel.org; intel-wired-lan@...ts.osuosl.org; Stefan Priebe <s.priebe@...fihost.ag>
> Subject: [Intel-wired-lan] [PATCH 1/2] e1000e: Don't return uninitialized stats
>
> Some statistics passed to ethtool are garbage because e1000e_get_stats64() doesn't write them, for example: tx_heartbeat_errors. This leaks kernel memory to userspace and confuses users.
>
> Do like ixgbe and use dev_get_stats() which first zeroes out rtnl_link_stats64.
>
> Reported-by: Stefan Priebe <s.priebe@...fihost.ag>
> Signed-off-by: Benjamin Poirier <bpoirier@...e.com>
> ---
>   drivers/net/ethernet/intel/e1000e/ethtool.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
> index 7aff68a4a4df..f117b90cdc2f 100644
> --- a/drivers/net/ethernet/intel/e1000e/ethtool.c
> +++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
> @@ -2063,7 +2063,7 @@ static void e1000_get_ethtool_stats(struct net_device *netdev,
>   
>   	pm_runtime_get_sync(netdev->dev.parent);
>   
> -	e1000e_get_stats64(netdev, &net_stats);
> +	dev_get_stats(netdev, &net_stats);
>   
>   	pm_runtime_put_sync(netdev->dev.parent);
>   
> --
> 2.12.2
>
> _______________________________________________
> Intel-wired-lan mailing list
> Intel-wired-lan@...ts.osuosl.org
> http://lists.osuosl.org/mailman/listinfo/intel-wired-lan

Hello,

We would like to not accept this patch. Suggested generic method 
'*dev_get_stats' (net/core/dev.c) calls 'ops->ndo_get_stats64' method 
which eventually calls e1000e_get_stats64 (netdev.c) - so there is same 
functionality. Also, see that 'e1000e_get_stats64' method in netdev.c 
(line 5928) calls 'memset' with 0's before update statistics.  Local 
sanity check in our lab shows 'tx_heartbeat_errors' counter reported as 0.

Thanks,

Sasha

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