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Message-ID: <e637fe93-692d-48b1-9cb9-11719f8c90c3@kernel.org>
Date: Thu, 14 Dec 2023 12:04:35 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, shuah@...nel.org, s-vadapalli@...com,
r-gunasekaran@...com, vigneshr@...com, srk@...com, horms@...nel.org,
p-varis@...com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 net-next 11/11] net: ethernet: ti: am65-cpsw: Fix
get_eth_mac_stats
On 13/12/2023 15:54, Vladimir Oltean wrote:
> On Wed, Dec 13, 2023 at 01:07:21PM +0200, Roger Quadros wrote:
>> We do not support individual stats for PMAC and EMAC so
>> report only aggregate stats.
>>
>> Fixes: 67372d7a85fc ("net: ethernet: am65-cpsw: Add standard Ethernet MAC stats to ethtool")
>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>> ---
>> drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> Changelog:
>>
>> v8: initial commit
>>
>> diff --git a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
>> index d2baffb05d55..35e318458b0c 100644
>> --- a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
>> +++ b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
>> @@ -671,6 +671,9 @@ static void am65_cpsw_get_eth_mac_stats(struct net_device *ndev,
>>
>> stats = port->stat_base;
>>
>> + if (s->src != ETHTOOL_MAC_STATS_SRC_AGGREGATE)
>> + return;
>> +
>> s->FramesTransmittedOK = readl_relaxed(&stats->tx_good_frames);
>> s->SingleCollisionFrames = readl_relaxed(&stats->tx_single_coll_frames);
>> s->MultipleCollisionFrames = readl_relaxed(&stats->tx_mult_coll_frames);
>> --
>> 2.34.1
>>
>
> Fixes are only fixes if they address a visible issue. And the blamed
> commit is the one that made the issue visible - the same one that
> "git bisect" would lead to - not necessarily the commit that introduced
> the code being changed.
>
> If you look at net/ethtool/stats.c, it will only accept ETHTOOL_MAC_STATS_SRC_AGGREGATE
> for drivers that don't support the MAC Merge layer.
>
> if ((src == ETHTOOL_MAC_STATS_SRC_EMAC ||
> src == ETHTOOL_MAC_STATS_SRC_PMAC) &&
> !__ethtool_dev_mm_supported(dev)) {
> NL_SET_ERR_MSG_MOD(info->extack,
> "Device does not support MAC merge layer");
> ethnl_ops_complete(dev);
> return -EOPNOTSUPP;
> }
Got it.
>
> So, there was nothing broken in commit 67372d7a85fc ("net: ethernet:
> am65-cpsw: Add standard Ethernet MAC stats to ethtool").
>
> The first broken commit is when you add support for get_mm(), such that
> __ethtool_dev_mm_supported() returns true.
>
> And because you don't add bugs in the code just to fix them later in the
> series, you need to order the patches such that all the dependencies for
> get_mm() are in place before the get_mm() support is added.
>
> Translated to your case, this patch must not be 11/11, and it must have
> the Fixes: tag dropped, and it must explain in the commit message that
> it is preparatory work.
OK. I take care of this in next spin. Thanks.
>
> --
> pw-bot: changes-requested
--
cheers,
-roger
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