netdev - Re: [PATCH v2] octeontx2-pf: Use the napi_alloc

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Message-ID: <20200509005332.GK3222151@pek-khao-d2.corp.ad.wrs.com>
Date:   Sat, 9 May 2020 08:53:32 +0800
From:   Kevin Hao <haokexin@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Sunil Goutham <sgoutham@...vell.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        hariprasad <hkelam@...vell.com>, davem@...emloft.net,
        Sunil Kovvuri <sunil.kovvuri@...il.com>
Subject: Re: [PATCH v2] octeontx2-pf: Use the napi_alloc_frag() to alloc the
 pool buffers

On Fri, May 08, 2020 at 05:38:33PM -0700, Jakub Kicinski wrote:
> On Fri,  8 May 2020 19:49:53 +0800 Kevin Hao wrote:
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > index f1d2dea90a8c..612d33207326 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> > @@ -379,40 +379,33 @@ void otx2_config_irq_coalescing(struct otx2_nic *pfvf, int qidx)
> >  		     (pfvf->hw.cq_ecount_wait - 1));
> >  }
> >  
> > -dma_addr_t otx2_alloc_rbuf(struct otx2_nic *pfvf, struct otx2_pool *pool,
> > -			   gfp_t gfp)
> > +dma_addr_t _otx2_alloc_rbuf(struct otx2_nic *pfvf, struct otx2_pool *pool)
> 
> If you need to respin please use double underscore as a prefix, it's
> a far more common style in the kernel.

Sure.

> 
> >  {
> >  	dma_addr_t iova;
> > +	u8 *buf;
> >  
> > -	/* Check if request can be accommodated in previous allocated page */
> > -	if (pool->page && ((pool->page_offset + pool->rbsize) <=
> > -	    (PAGE_SIZE << pool->rbpage_order))) {
> > -		pool->pageref++;
> > -		goto ret;
> > -	}
> > -
> > -	otx2_get_page(pool);
> > -
> > -	/* Allocate a new page */
> > -	pool->page = alloc_pages(gfp | __GFP_COMP | __GFP_NOWARN,
> > -				 pool->rbpage_order);
> > -	if (unlikely(!pool->page))
> > +	buf = napi_alloc_frag(pool->rbsize);
> > +	if (unlikely(!buf))
> >  		return -ENOMEM;
> >  
> > -	pool->page_offset = 0;
> > -ret:
> > -	iova = (u64)otx2_dma_map_page(pfvf, pool->page, pool->page_offset,
> > -				      pool->rbsize, DMA_FROM_DEVICE);
> > -	if (!iova) {
> > -		if (!pool->page_offset)
> > -			__free_pages(pool->page, pool->rbpage_order);
> > -		pool->page = NULL;
> > +	iova = dma_map_single_attrs(pfvf->dev, buf, pool->rbsize,
> > +				    DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
> > +	if (unlikely(dma_mapping_error(pfvf->dev, iova)))
> 
> Thanks for doing this, but aren't you leaking the buf on DMA mapping
> error?

Ouch, I missed that. Will fix.

Thanks,
Kevin

> 
> >  		return -ENOMEM;
> > -	}
> > -	pool->page_offset += pool->rbsize;
> > +
> >  	return iova;
> >  }

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