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

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Date:   Fri, 8 May 2020 17:38:33 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Kevin Hao <haokexin@...il.com>
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,  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.

>  {
>  	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?

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