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

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Message-ID: <20210121050910.GB442272@pek-khao-d2.corp.ad.wrs.com>
Date:   Thu, 21 Jan 2021 13:09:10 +0800
From:   Kevin Hao <haokexin@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     sundeep.lkml@...il.com, davem@...emloft.net,
        netdev@...r.kernel.org, gakula@...vell.com, hkelam@...vell.com,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        Sunil Goutham <sgoutham@...vell.com>
Subject: Re: [PATCH] Revert "octeontx2-pf: Use the napi_alloc_frag() to alloc
 the pool buffers"

On Wed, Jan 20, 2021 at 08:59:14PM -0800, Jakub Kicinski wrote:
> On Thu, 21 Jan 2021 12:20:35 +0800 Kevin Hao wrote:
> > Hmm, why not?
> >   buf = napi_alloc_frag(pool->rbsize + 128);
> >   buf = PTR_ALIGN(buf, 128);
> 
> I'd keep the aligning in the driver until there are more users
> needing this but yes, I agree, aligning the page frag buffers 
> seems like a much better fix.

It seems that the DPAA2 driver also need this (drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c):
	/* Prepare the HW SGT structure */
	sgt_buf_size = priv->tx_data_offset +
		       sizeof(struct dpaa2_sg_entry) *  num_dma_bufs;
	sgt_buf = napi_alloc_frag(sgt_buf_size + DPAA2_ETH_TX_BUF_ALIGN);
	if (unlikely(!sgt_buf)) {
		err = -ENOMEM;
		goto sgt_buf_alloc_failed;
	}
	sgt_buf = PTR_ALIGN(sgt_buf, DPAA2_ETH_TX_BUF_ALIGN);

Thanks,
Kevin

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