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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Mon, 12 Feb 2024 11:45:09 +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 10/02/2024 18:42, Sergey Shtylyov wrote:
> On 2/6/24 12:19 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.

>    Also, s/Requires SW/Needs software/ and s/to achieve best performance//,
> please...

Will do.

> 
> [...]
> 
> MBR, Sergey

Thanks for the review,
Paul
Download attachment "OpenPGP_0x27F4B3459F002257.asc" of type "application/pgp-keys" (3521 bytes)

Download attachment "OpenPGP_signature.asc" of type "application/pgp-signature" (237 bytes)