linux-kernel - Re: [PATCH] net: ena: Do not waste napi skb cache

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Date:   Sat, 29 Jan 2022 08:56:27 +0000
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Julian Wiedmann <jwiedmann.dev@...il.com>
Cc:     Shay Agroskin <shayagr@...zon.com>, netdev@...r.kernel.org,
        Arthur Kiyanovski <akiyano@...zon.com>,
        David Arinzon <darinzon@...zon.com>,
        Noam Dagan <ndagan@...zon.com>,
        Saeed Bishara <saeedb@...zon.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ena: Do not waste napi skb cache

On Tue, Jan 25, 2022 at 03:50:30PM +0200, Julian Wiedmann wrote:
> On 25.01.22 11:34, Hyeonggon Yoo wrote:
> > On Mon, Jan 24, 2022 at 10:50:05PM +0200, Shay Agroskin wrote:
> >>
> 
> [...]
> 
> >>
> >> I agree that the netdev_alloc_skb_ip_align() can become napi_alloc_skb().
> >> Hyeonggon Yoo, can you please apply this change as well to this patch?
> >>
> > 
> > Okay. I'll update and test it again.
> > 
> > BTW, It seems netdev_alloc_skb_ip_align() is used to make some fields
> > be aligned. It's okay to just ignore this?
> > 
> 
> napi_alloc_skb() adds NET_IP_ALIGN internally, so you end up with the same alignment as before.
> 

Oh I was missing that. I updated the patch and tested again.
Thank you!

> 
> > Thanks,
> > Hyeonggon.
> > 
> >> Thanks,
> >> Shay
> >>
> >>
> >>>>>  	else
> >>>>> -		skb = build_skb(first_frag, ENA_PAGE_SIZE);
> >>>>> +		skb = napi_build_skb(first_frag, ENA_PAGE_SIZE);
> >>>>>  	if (unlikely(!skb)) {
> >>>>>  		ena_increase_stat(&rx_ring->rx_stats.skb_alloc_fail,  1,
> >>>>
>