linux-kernel - Re: [RFC PATCH net-next v2 6/7] net: ravb: Enable SW IRQ Coalescing for GbEth

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Date: Wed, 14 Feb 2024 09:29:49 +0000
From: Paul Barker <paul.barker.ct@...renesas.com>
To: Sergey Shtylyov <s.shtylyov@....ru>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
 Wolfram Sang <wsa+renesas@...g-engineering.com>, netdev@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next v2 6/7] net: ravb: Enable SW IRQ Coalescing
 for GbEth

On 12/02/2024 20:40, Sergey Shtylyov wrote:
> On 2/12/24 2:45 PM, Paul Barker wrote:
> [...]
>>>> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
>>>> index 55a7a08aabef..ca7a66759e35 100644
>>>> --- a/drivers/net/ethernet/renesas/ravb.h
>>>> +++ b/drivers/net/ethernet/renesas/ravb.h
>>>> @@ -1078,6 +1078,7 @@ struct ravb_hw_info {
>>>>  	unsigned nc_queues:1;		/* AVB-DMAC has RX and TX NC queues */
>>>>  	unsigned magic_pkt:1;		/* E-MAC supports magic packet detection */
>>>>  	unsigned half_duplex:1;		/* E-MAC supports half duplex mode */
>>>> +	unsigned needs_irq_coalesce:1;	/* Requires SW IRQ Coalescing to achieve best performance */
>>>
>>>    Is this really a hardware feature?
>>
>> It's more like a requirement to get the best out of this hardware and the Linux networking stack.
>>
>> I considered checking the compatible string in the probe function but I decided that storing a configuration bit in the HW info struct was cleaner.
> 
>    Yes, but you added the new bit under the "hardware features" commet. :-)
> 
>>>    Also, s/Requires SW/Needs software/ and s/to achieve best performance//,
>>> please...
>>
>> Will do.
> 
>    The comment is too long, I think. :-)

I'll fix both in the next revision.

-- 
Paul Barker

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