linux-kernel - Re: [PATCH iwl-next v4 5/9] igc: Add support for frame preemption verification

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Message-ID: <b3e02516-d59c-4ed4-b59d-afa72c23d04b@linux.intel.com>
Date: Wed, 19 Feb 2025 09:48:34 +0800
From: "Abdul Rahim, Faizal" <faizal.abdul.rahim@...ux.intel.com>
To: Simon Horman <horms@...nel.org>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>,
 Przemek Kitszel <przemyslaw.kitszel@...el.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S . Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Russell King <linux@...linux.org.uk>, Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 John Fastabend <john.fastabend@...il.com>, Furong Xu <0x1207@...il.com>,
 Russell King <rmk+kernel@...linux.org.uk>,
 Vladimir Oltean <vladimir.oltean@....com>,
 Serge Semin <fancer.lancer@...il.com>,
 Xiaolei Wang <xiaolei.wang@...driver.com>,
 Suraj Jaiswal <quic_jsuraj@...cinc.com>,
 Kory Maincent <kory.maincent@...tlin.com>, Gal Pressman <gal@...dia.com>,
 Jesper Nilsson <jesper.nilsson@...s.com>,
 Andrew Halaney <ahalaney@...hat.com>,
 Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
 Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
 Vinicius Costa Gomes <vinicius.gomes@...el.com>,
 intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org
Subject: Re: [PATCH iwl-next v4 5/9] igc: Add support for frame preemption
 verification

On 17/2/2025 7:31 pm, Simon Horman wrote:
> On Mon, Feb 10, 2025 at 02:02:03AM -0500, Faizal Rahim wrote:
> 
> ...
> 
>> diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.c b/drivers/net/ethernet/intel/igc/igc_tsn.c
> 
> ...
> 
>> +bool igc_fpe_transmitted_smd_v(union igc_adv_tx_desc *tx_desc)
>> +{
>> +	u8 smd = FIELD_GET(IGC_TXD_POPTS_SMD_MASK, tx_desc->read.olinfo_status);
> 
> olininfo_status is little-endian, so I think it needs
> to be converted to host byte order when used as an
> argument to FIELD_GET().
> 
> Flagged by Sparse.
> 
>> +
>> +	return smd == SMD_V;
>> +}
> 
> ...
> 
>> diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.h b/drivers/net/ethernet/intel/igc/igc_tsn.h
> 
> ...
> 
>> +static inline void igc_fpe_lp_event_status(union igc_adv_rx_desc *rx_desc,
>> +					   struct ethtool_mmsv *mmsv)
>> +{
>> +	__le32 status_error = le32_to_cpu(rx_desc->wb.upper.status_error);
> 
> It looks like the type of status_error should be a host byte order integer,
> such as u32.
> 
> Also flagged by Sparse.

Thanks for spotting these, I'll update them.