linux-kernel - RE: [EXT] Re: [PATCH net-next v2 6/8] octeon_ep_vf: add Tx/Rx processing and interrupt support

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Date: Fri, 5 Jan 2024 15:08:18 +0000
From: Shinas Rasheed <srasheed@...vell.com>
To: Simon Horman <horms@...nel.org>
CC: Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
        Haseeb Gani <hgani@...vell.com>, Vimlesh
 Kumar <vimleshk@...vell.com>,
        Sathesh B Edara <sedara@...vell.com>,
        "egallen@...hat.com" <egallen@...hat.com>,
        "mschmidt@...hat.com"
	<mschmidt@...hat.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "wizhao@...hat.com" <wizhao@...hat.com>,
        "kheib@...hat.com"
	<kheib@...hat.com>,
        "konguyen@...hat.com" <konguyen@...hat.com>,
        Veerasenareddy Burru <vburru@...vell.com>,
        Satananda Burla
	<sburla@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet
	<edumazet@...gle.com>
Subject: RE: [EXT] Re: [PATCH net-next v2 6/8] octeon_ep_vf: add Tx/Rx
 processing and interrupt support

Thanks Simon for the comments. Will update in v3

> -----Original Message-----
> From: Simon Horman <horms@...nel.org>
> Sent: Friday, January 5, 2024 4:35 PM
> To: Shinas Rasheed <srasheed@...vell.com>
> Cc: Jakub Kicinski <kuba@...nel.org>; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; Haseeb Gani <hgani@...vell.com>; Vimlesh Kumar
> <vimleshk@...vell.com>; Sathesh B Edara <sedara@...vell.com>;
> egallen@...hat.com; mschmidt@...hat.com; pabeni@...hat.com;
> wizhao@...hat.com; kheib@...hat.com; konguyen@...hat.com;
> Veerasenareddy Burru <vburru@...vell.com>; Satananda Burla
> <sburla@...vell.com>; David S. Miller <davem@...emloft.net>; Eric
> Dumazet <edumazet@...gle.com>
> Subject: Re: [EXT] Re: [PATCH net-next v2 6/8] octeon_ep_vf: add Tx/Rx
> processing and interrupt support
> 
> On Fri, Jan 05, 2024 at 07:26:14AM +0000, Shinas Rasheed wrote:
> > Hi Jakub,
> >
> > Thanks for the review!
> >
> > > > +	rx_done = octep_vf_oq_process_rx(ioq_vector->oq, budget);
> > >
> > > You should not call Rx processing if budget is 0 at all, please see
> > > NAPI docs. Looks like the function may try to refill Rx buffers with
> > > budget of 0.
> > >
> > If budget is zero, octep_vf_oq_process_rx just wouldn't try to query hw for
> packets. Also since by then, the refill count should have been less than refill
> threshold, if not it only flushes free buffers back to the ring, (and tell hw that
> there are more free buffers available which have been processed from maybe
> previous calls - but this seems unlikely and should have been flushed at that
> time).
> >
> > > > @@ -114,8 +158,8 @@ static int octep_vf_setup_oq(struct
> octep_vf_device
> > > *oct, int q_no)
> > > >  		goto desc_dma_alloc_err;
> > > >  	}
> > > >
> > > > -	oq->buff_info = (struct octep_vf_rx_buffer *)
> > > > -			vzalloc(oq->max_count *
> > > OCTEP_VF_OQ_RECVBUF_SIZE);
> > > > +	oq->buff_info = vzalloc(oq->max_count *
> > > OCTEP_VF_OQ_RECVBUF_SIZE);
> > > > +
> > >
> > > bad fixup squash?
> > >
> > Sorry, I didn't understand. Can you explain?
> 
> I think he means that this change seems to make a minor update
> to code introduced in a previous patch of this series, and thus should
> be squashed into that previous patch.