netdev - Re: [net-next PATCH v3 01/11] octeontx2-af: Simplify context writing and reading to hardware

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Message-ID: <aIJIQDtlx7WJtftf@opensource>
Date: Thu, 24 Jul 2025 14:50:40 +0000
From: Subbaraya Sundeep <sbhatta@...vell.com>
To: Simon Horman <horms@...nel.org>
CC: <andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <gakula@...vell.com>,
        <hkelam@...vell.com>, <bbhushan2@...vell.com>, <jerinj@...vell.com>,
        <lcherian@...vell.com>, <sgoutham@...vell.com>,
        <netdev@...r.kernel.org>
Subject: Re: [net-next PATCH v3 01/11] octeontx2-af: Simplify context writing
 and reading to hardware

Hi Simon,

On 2025-07-22 at 16:29:50, Simon Horman (horms@...nel.org) wrote:
> On Tue, Jul 22, 2025 at 05:27:43PM +0100, Simon Horman wrote:
> > On Thu, Jul 17, 2025 at 10:37:33PM +0530, Subbaraya Sundeep wrote:
> > > Simplify NIX context reading and writing by using hardware
> > > maximum context size instead of using individual sizes of
> > > each context type.
> > > 
> > > Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
> > 
> > ...
> > 
> > > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_struct.h b/drivers/net/ethernet/marvell/octeontx2/af/rvu_struct.h
> > > index 0596a3ac4c12..1097c86fdc46 100644
> > > --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_struct.h
> > > +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_struct.h
> > > @@ -13,6 +13,8 @@
> > >  
> > >  #define RVU_MULTI_BLK_VER		0x7ULL
> > >  
> > > +#define NIX_MAX_CTX_SIZE		128
> > > +
> > >  /* RVU Block Address Enumeration */
> > >  enum rvu_block_addr_e {
> > >  	BLKADDR_RVUM		= 0x0ULL,
> > > @@ -370,8 +372,12 @@ struct nix_cq_ctx_s {
> > >  	u64 qsize		: 4;
> > >  	u64 cq_err_int		: 8;
> > >  	u64 cq_err_int_ena	: 8;
> > > +	/* Ensure all context sizes are minimum 128 bytes */
> > 
> > Would this be better phrased as follows?
> > 
> > 	/* Ensure all context sizes are 128 bytes */
> > 
> > > +	u64 padding[12];
> > >  };
> > >  
> > > +static_assert(sizeof(struct nix_cq_ctx_s) == NIX_MAX_CTX_SIZE);
> > 
> > I would suggest adding +static_assert() for all the
> > drivers that you expect to be NIX_MAX_CTX_SIZE.
> > 
> > So also:
> > - struct nix_rq_ctx_s
> > - struct nix_sq_ctx_s
> > - struct nix_bandprof_s
> 
> Likewise for new structures added by subsequent patches.

Sure. I will add for all structures

Thanks,
Sundeep
> 
> ...