linux-kernel - Re: [PATCH net-next v2] bnxt_en: use dev_consume_skb_any() in bnxt_tx

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Message-ID: <20230711200955.2d3a4494@kernel.org>
Date:   Tue, 11 Jul 2023 20:09:55 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     menglong8.dong@...il.com
Cc:     michael.chan@...adcom.com, leon@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Menglong Dong <imagedong@...cent.com>,
        Leon Romanovsky <leonro@...dia.com>
Subject: Re: [PATCH net-next v2] bnxt_en: use dev_consume_skb_any() in
 bnxt_tx_int

On Tue, 11 Jul 2023 19:07:43 +0800 menglong8.dong@...il.com wrote:
> In bnxt_tx_int(), the skb in the tx ring buffer will be freed after the
> transmission completes with dev_kfree_skb_any(), which will produce
> the noise on the tracepoint "skb:kfree_skb":
> 
> $ perf script record -e skb:kfree_skb -a
> $ perf script
>   swapper     0 [014] 12814.337522: skb:kfree_skb: skbaddr=0xffff88818f145ce0 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED
>   swapper     0 [003] 12814.338318: skb:kfree_skb: skbaddr=0xffff888108380600 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED
>   swapper     0 [014] 12814.375258: skb:kfree_skb: skbaddr=0xffff88818f147ce0 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED
>   swapper     0 [014] 12814.451960: skb:kfree_skb: skbaddr=0xffff88818f145ce0 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED
>   swapper     0 [008] 12814.562166: skb:kfree_skb: skbaddr=0xffff888112664600 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED
>   swapper     0 [014] 12814.732517: skb:kfree_skb: skbaddr=0xffff88818f145ce0 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED
>   swapper     0 [014] 12814.800608: skb:kfree_skb: skbaddr=0xffff88810025d100 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED
>   swapper     0 [014] 12814.861501: skb:kfree_skb: skbaddr=0xffff888108295a00 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED
>   swapper     0 [014] 12815.377038: skb:kfree_skb: skbaddr=0xffff88818f147ce0 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED
>   swapper     0 [014] 12815.395530: skb:kfree_skb: skbaddr=0xffff88818f145ee0 protocol=2048 location=dev_kfree_skb_any_reason+0x2e reason: NOT_SPECIFIED

I think this is way too verbose, people looking at networking code 
are expected to understand kfree_skb vs consume_skb. Your v1 was fine,
I'm going to apply it.
-- 
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