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Date:	Fri, 18 Jul 2014 09:17:51 +0530
From:	Varka Bhadram <varkabhadram@...il.com>
To:	Ethan Zhao <ethan.zhao@...cle.com>, manish.chopra@...gic.com,
	sony.chacko@...gic.com, rajesh.borundia@...gic.com,
	netdev@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, ethan.kernel@...il.com
Subject: Re: [PATCH V3] netxen: fix ethtool rx_dropped information in ethtool
 get_ethtool_stats()

On 07/18/2014 09:13 AM, Ethan Zhao wrote:
> netxen driver has implemented netxen_nic_get_ethtool_stats() interface,
> but it doesn't collect stats.rxdropped in driver, so we will get
> different rx_dropped statistic information while using ifconfig and ethtool.
> this patch fills stats.rxdropped field with data from net core
> with dev_get_stats() just as ixgbe driver did for some of its stats.
>
> Tested with last netxen 4.0.82
> Compiled with stable 3.15.6
>
> Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>
> Tested-by: Sriharsha Yadagudde <sriharsha.devdas@...cle.com>
> ---
> -v2 only fix rx_dropped field, not all.
> -v3 workaround checkpatch.pl bug according to suggestion from Joe Perches <joe@...ches.com>
>   
> .../ethernet/qlogic/netxen/netxen_nic_ethtool.c    |   59 +++++++++++++++-----
>   1 files changed, 45 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c
> index 87e073c..2753f00 100644
> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c
> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c
> @@ -31,28 +31,43 @@
>   #include "netxen_nic.h"
>   #include "netxen_nic_hw.h"
>   
> +enum {NETDEV_STATS, NETXEN_STATS};
> +
>   struct netxen_nic_stats {
>   	char stat_string[ETH_GSTRING_LEN];
> +	int type;
>   	int sizeof_stat;
>   	int stat_offset;
>   };
>   
> -#define NETXEN_NIC_STAT(m) sizeof(((struct netxen_adapter *)0)->m), \
> -			offsetof(struct netxen_adapter, m)
> +#define NETXEN_NIC_STAT(name, m)					\
> +{									\
> +	.stat_string = name,						\
> +	.type = NETXEN_STATS,						\
> +	.sizeof_stat = FIELD_SIZEOF(struct netxen_adapter, m),		\
> +	.stat_offset = offsetof(struct netxen_adapter, m)		\
> +}
> +
> +#define NETXEN_NETDEV_STAT(name, m)					\
> +{	.stat_string = name,						\
> +	.type =	NETDEV_STATS,						\
> +	.sizeof_stat = FIELD_SIZEOF(struct rtnl_link_stats64, m),	\
> +	.stat_offset = offsetof(struct rtnl_link_stats64, m)		\
> +}
>   
>   #define NETXEN_NIC_PORT_WINDOW 0x10000
>   #define NETXEN_NIC_INVALID_DATA 0xDEADBEEF
>   
>   static const struct netxen_nic_stats netxen_nic_gstrings_stats[] = {
> -	{"xmit_called", NETXEN_NIC_STAT(stats.xmitcalled)},
> -	{"xmit_finished", NETXEN_NIC_STAT(stats.xmitfinished)},
> -	{"rx_dropped", NETXEN_NIC_STAT(stats.rxdropped)},
> -	{"tx_dropped", NETXEN_NIC_STAT(stats.txdropped)},
> -	{"csummed", NETXEN_NIC_STAT(stats.csummed)},
> -	{"rx_pkts", NETXEN_NIC_STAT(stats.rx_pkts)},
> -	{"lro_pkts", NETXEN_NIC_STAT(stats.lro_pkts)},
> -	{"rx_bytes", NETXEN_NIC_STAT(stats.rxbytes)},
> -	{"tx_bytes", NETXEN_NIC_STAT(stats.txbytes)},
> +	NETXEN_NIC_STAT("xmit_called", stats.xmitcalled),
> +	NETXEN_NIC_STAT("xmit_finished", stats.xmitfinished),
> +	NETXEN_NETDEV_STAT("rx_dropped", rx_dropped),
> +	NETXEN_NIC_STAT("tx_dropped", stats.txdropped),
> +	NETXEN_NIC_STAT("csummed", stats.csummed),
> +	NETXEN_NIC_STAT("rx_pkts", stats.rx_pkts),
> +	NETXEN_NIC_STAT("lro_pkts", stats.lro_pkts),
> +	NETXEN_NIC_STAT("rx_bytes", stats.rxbytes),
> +	NETXEN_NIC_STAT("tx_bytes", stats.txbytes),
>   };
>   
>   #define NETXEN_NIC_STATS_LEN	ARRAY_SIZE(netxen_nic_gstrings_stats)
> @@ -677,11 +692,27 @@ netxen_nic_get_ethtool_stats(struct net_device *dev,
>   {
>   	struct netxen_adapter *adapter = netdev_priv(dev);
>   	int index;
> +	struct rtnl_link_stats64 temp;
> +	const struct rtnl_link_stats64 *net_stats;
> +	char *p = NULL;
>   
> +	net_stats = dev_get_stats(dev, &temp);
>   	for (index = 0; index < NETXEN_NIC_STATS_LEN; index++) {
> -		char *p =
> -		    (char *)adapter +
> -		    netxen_nic_gstrings_stats[index].stat_offset;
> +
> +		switch (netxen_nic_gstrings_stats[index].type) {
> +		case NETDEV_STATS:
> +			p = (char *)net_stats +
> +				netxen_nic_gstrings_stats[index].stat_offset;
> +			break;
> +		case NETXEN_STATS:
> +			p = (char *)adapter +
> +				netxen_nic_gstrings_stats[index].stat_offset;
> +			break;
> +		default:
> +			data[index] = 0;
> +			continue;

If there is a chance of default case, then it will be always in switch case ...?

> +		}
> +
>   		data[index] =
>   		    (netxen_nic_gstrings_stats[index].sizeof_stat ==
>   		     sizeof(u64)) ? *(u64 *) p : *(u32 *) p;


-- 
Regards,
Varka Bhadram.

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