netdev - Re: [PATCH net-next v6 3/6] net: bcmasp: Add support for ASP2.0 Ethernet controller

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Message-ID: <956dc20f-386c-f4fe-b827-1a749ee8af02@broadcom.com>
Date: Tue, 6 Jun 2023 15:58:21 -0700
From: Justin Chen <justin.chen@...adcom.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 bcm-kernel-feedback-list@...adcom.com, florian.fainelli@...adcom.com,
 davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 opendmb@...il.com, andrew@...n.ch, hkallweit1@...il.com,
 linux@...linux.org.uk, richardcochran@...il.com, sumit.semwal@...aro.org,
 christian.koenig@....com, simon.horman@...igine.com
Subject: Re: [PATCH net-next v6 3/6] net: bcmasp: Add support for ASP2.0
 Ethernet controller



On 6/2/23 11:58 PM, Jakub Kicinski wrote:
> On Thu,  1 Jun 2023 15:12:28 -0700 Justin Chen wrote:
>> +	/* general stats */
>> +	STAT_NETDEV(rx_packets),
>> +	STAT_NETDEV(tx_packets),
>> +	STAT_NETDEV(rx_bytes),
>> +	STAT_NETDEV(tx_bytes),
>> +	STAT_NETDEV(rx_errors),
>> +	STAT_NETDEV(tx_errors),
>> +	STAT_NETDEV(rx_dropped),
>> +	STAT_NETDEV(tx_dropped),
>> +	STAT_NETDEV(multicast),
> 
> please don't report standard interface stats in ethtool -S
> 

These are not netdev statistics but MAC block counters. Guess it is not 
clear with the naming here, will fix this. We have a use case where the 
MAC traffic may be redirected from the associated net dev, so the 
counters may not be the same.

>> +	/* UniMAC RSV counters */
>> +	STAT_BCMASP_MIB_RX("rx_64_octets", mib.rx.pkt_cnt.cnt_64),
>> +	STAT_BCMASP_MIB_RX("rx_65_127_oct", mib.rx.pkt_cnt.cnt_127),
>> +	STAT_BCMASP_MIB_RX("rx_128_255_oct", mib.rx.pkt_cnt.cnt_255),
>> +	STAT_BCMASP_MIB_RX("rx_256_511_oct", mib.rx.pkt_cnt.cnt_511),
>> +	STAT_BCMASP_MIB_RX("rx_512_1023_oct", mib.rx.pkt_cnt.cnt_1023),
>> +	STAT_BCMASP_MIB_RX("rx_1024_1518_oct", mib.rx.pkt_cnt.cnt_1518),
>> +	STAT_BCMASP_MIB_RX("rx_vlan_1519_1522_oct", mib.rx.pkt_cnt.cnt_mgv),
>> +	STAT_BCMASP_MIB_RX("rx_1522_2047_oct", mib.rx.pkt_cnt.cnt_2047),
>> +	STAT_BCMASP_MIB_RX("rx_2048_4095_oct", mib.rx.pkt_cnt.cnt_4095),
>> +	STAT_BCMASP_MIB_RX("rx_4096_9216_oct", mib.rx.pkt_cnt.cnt_9216),
> 
> these should also be removed, and you should implement @get_rmon_stats.
> 
>> +	STAT_BCMASP_MIB_RX("rx_pkts", mib.rx.pkt),
>> +	STAT_BCMASP_MIB_RX("rx_bytes", mib.rx.bytes),
>> +	STAT_BCMASP_MIB_RX("rx_multicast", mib.rx.mca),
>> +	STAT_BCMASP_MIB_RX("rx_broadcast", mib.rx.bca),
>> +	STAT_BCMASP_MIB_RX("rx_fcs", mib.rx.fcs),
> 
> there's a FCS error statistic in the standard stats, no need to
> duplicate
> 

Same comment as above

>> +	STAT_BCMASP_MIB_RX("rx_control", mib.rx.cf),
>> +	STAT_BCMASP_MIB_RX("rx_pause", mib.rx.pf),
> 
> @get_pause_stats
> 
>> +	STAT_BCMASP_MIB_RX("rx_unknown", mib.rx.uo),
>> +	STAT_BCMASP_MIB_RX("rx_align", mib.rx.aln),
>> +	STAT_BCMASP_MIB_RX("rx_outrange", mib.rx.flr),
>> +	STAT_BCMASP_MIB_RX("rx_code", mib.rx.cde),
>> +	STAT_BCMASP_MIB_RX("rx_carrier", mib.rx.fcr),
>> +	STAT_BCMASP_MIB_RX("rx_oversize", mib.rx.ovr),
>> +	STAT_BCMASP_MIB_RX("rx_jabber", mib.rx.jbr),
> 
> these look like candidates from standard stats, too.
> Please read thru:
> 
> https://docs.kernel.org/next/networking/statistics.html
> 

Looks like the way we are doing stats are a bit outdated. Thanks for 
pointing it out. I got a bit of refactoring to do.

>> +	STAT_BCMASP_MIB_RX("rx_mtu_err", mib.rx.mtue),
>> +	STAT_BCMASP_MIB_RX("rx_good_pkts", mib.rx.pok),
>> +	STAT_BCMASP_MIB_RX("rx_unicast", mib.rx.uc),
>> +	STAT_BCMASP_MIB_RX("rx_ppp", mib.rx.ppp),
>> +	STAT_BCMASP_MIB_RX("rx_crc", mib.rx.rcrc),
> 
> hm, what's the difference between rx_crc and rx_fcs ?

This looks like some debug feature that really has nothing to do with 
verifying crcs. I will remove it.

Apologies, probably should have done my due diligence with each stats 
instead of blindly including everything.

Thanks,
Justin

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