linux-kernel - Re: [PATCH V12 net-next 07/10] net: hibmcge: Implement rx

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Message-ID: <ee1205d6-3d6b-447f-991e-903936d45ac7@redhat.com>
Date: Tue, 15 Oct 2024 13:57:07 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Jijie Shao <shaojijie@...wei.com>, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org
Cc: shenjian15@...wei.com, wangpeiyang1@...wei.com, liuyonglong@...wei.com,
 chenhao418@...wei.com, sudongming1@...wei.com, xujunsheng@...wei.com,
 shiyongbang@...wei.com, libaihan@...wei.com, andrew@...n.ch,
 jdamato@...tly.com, horms@...nel.org, kalesh-anakkur.purayil@...adcom.com,
 christophe.jaillet@...adoo.fr, jonathan.cameron@...wei.com,
 shameerali.kolothum.thodi@...wei.com, salil.mehta@...wei.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V12 net-next 07/10] net: hibmcge: Implement rx_poll
 function to receive packets

On 10/15/24 13:41, Jijie Shao wrote:
> on 2024/10/15 18:28, Paolo Abeni wrote:
>> Side note: the above always uses the maximum MTU for the packet size,
>> if the device supports jumbo frames (8Kb size packets), it will
>> produce quite bad layout for the incoming packets... Is the device
>> able to use multiple buffers for the incoming packets?
> 
> In fact, jumbo frames are not supported in device, and the maximum MTU is 4Kb.

FTR, even 4Kb is bad enough: tiny packets (tcp syn, UDP dns req) will 
use a truesize above 5K. You can get a much better the layout using 
copybreak.

Cheers,

Paolo