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Message-ID: <7e57c68b-1d73-40e2-824a-12193e62047f@bp.renesas.com>
Date: Tue, 26 Mar 2024 09:54:04 +0000
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Subject: Re: [PATCH 1/2] net: ravb: Always process TX descriptor ring
Content-Language: en-GB
To: =?UTF-8?Q?Niklas_S=C3=B6derlund?= <niklas.soderlund+renesas@ragnatech.se>
Cc: Sergey Shtylyov <s.shtylyov@omp.ru>, "David S. Miller"
 <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>,
 Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
 netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
 linux-kernel@vger.kernel.org
References: <20240326083740.23364-1-paul.barker.ct@bp.renesas.com>
 <20240326093843.GD1108818@ragnatech.se>
From: Paul Barker <paul.barker.ct@bp.renesas.com>
Organization: Renesas Electronics Corporation
In-Reply-To: <20240326093843.GD1108818@ragnatech.se>
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From: Paul Barker <paul.barker.ct@bp.renesas.com>
To: =?UTF-8?Q?Niklas_S=C3=B6derlund?= <niklas.soderlund+renesas@ragnatech.se>
Cc: Sergey Shtylyov <s.shtylyov@omp.ru>, "David S. Miller"
 <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>,
 Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
 netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
 linux-kernel@vger.kernel.org
Message-ID: <7e57c68b-1d73-40e2-824a-12193e62047f@bp.renesas.com>
Subject: Re: [PATCH 1/2] net: ravb: Always process TX descriptor ring
References: <20240326083740.23364-1-paul.barker.ct@bp.renesas.com>
 <20240326093843.GD1108818@ragnatech.se>
In-Reply-To: <20240326093843.GD1108818@ragnatech.se>

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On 26/03/2024 09:38, Niklas S=C3=B6derlund wrote:
> Hi Paul,
>=20
> Thanks for your work.
>=20
> On 2024-03-26 08:37:39 +0000, Paul Barker wrote:
>> The TX queue should be serviced each time the poll function is called,=

>> even if the full RX work budget has been consumed. This prevents
>> starvation of the TX queue when RX bandwidth usage is high.
>=20
> Is this not a design decision? That the driver should prioritize Rx ove=
r=20
> Tx if there is contention. I have no opinion on if this design is good =

> or bad, I let Sergey judge that.
>=20
>>
>> Fixes: a0d2f20650e8 ("Renesas Ethernet AVB PTP clock driver")
>=20
> However, I do not think it is a bug and should not have a fixes tag. =20
> Also this fixes tag is incorrect, this points to the commit where ravb.=
c=20
> was renamed ravb_main.c. ravb_poll() is not touched by this commit.

Sergey identified these as bugfixes in the following emails:
  https://lore.kernel.org/netdev/a364963f-4e4f-dba5-cb59-b2125c14e8fc@omp=
=2Eru/
  https://lore.kernel.org/netdev/c58ab319-222b-5ab0-0924-7774a473e276@omp=
=2Eru/

I got the wrong fixes tag though, it should be:
  Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")

Thanks,

--=20
Paul Barker

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