linux-kernel - Re: [PATCH net v3 2/3] net: stmmac: Consider Tx VLAN offload tag length for maxSDU

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Message-ID: <83ffc316-6711-4ae4-ad10-917f678de331@linux.dev>
Date: Fri, 17 Oct 2025 13:21:54 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: "G Thomas, Rohan" <rohan.g.thomas@...era.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>,
 Jose Abreu <Jose.Abreu@...opsys.com>,
 Rohan G Thomas <rohan.g.thomas@...el.com>,
 Boon Khai Ng <boon.khai.ng@...era.com>
Cc: netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Matthew Gerlach <matthew.gerlach@...era.com>
Subject: Re: [PATCH net v3 2/3] net: stmmac: Consider Tx VLAN offload tag
 length for maxSDU

On 17/10/2025 08:36, G Thomas, Rohan wrote:
> Hi All,
> 
> On 10/17/2025 11:41 AM, Rohan G Thomas via B4 Relay wrote:
>> +    sdu_len = skb->len;
>>       /* Check if VLAN can be inserted by HW */
>>       has_vlan = stmmac_vlan_insert(priv, skb, tx_q);
>> +    if (has_vlan)
>> +        sdu_len += VLAN_HLEN;
>> +
>> +    if (priv->est && priv->est->enable &&
>> +        priv->est->max_sdu[queue] &&
>> +        skb->len > priv->est->max_sdu[queue]){
> 
> I just noticed an issue with the reworked fix after sending the patch.
> The condition should be: sdu_len > priv->est->max_sdu[queue]
> 
> I’ll send a corrected version, and will wait for any additional comments
> in the meantime.

Well, even though it's a copy of original code, it would be good to
improve some formatting and add a space at the end of if statement to
make it look like 'if () {'>
>> +        priv->xstats.max_sdu_txq_drop[queue]++;
>> +        goto max_sdu_err;
>> +    }
>>       entry = tx_q->cur_tx;
>>       first_entry = entry;
>>
> 
> Best Regards,
> Rohan
>