netdev - Re: [PATCH 2/4] nvme-tcp: use sendpages_ok() instead of sendpage

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Date: Mon, 3 Jun 2024 09:22:53 +0200
From: Hannes Reinecke <hare@...e.de>
To: Ofir Gal <ofir.gal@...umez.com>, davem@...emloft.net,
 linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
 netdev@...r.kernel.org, ceph-devel@...r.kernel.org
Cc: dhowells@...hat.com, edumazet@...gle.com, pabeni@...hat.com,
 kbusch@...nel.org, axboe@...nel.dk, hch@....de, sagi@...mberg.me
Subject: Re: [PATCH 2/4] nvme-tcp: use sendpages_ok() instead of sendpage_ok()

On 5/30/24 15:26, Ofir Gal wrote:
> Currently nvme_tcp_try_send_data() use sendpage_ok() in order to disable
> MSG_SPLICE_PAGES, it check the first page of the iterator, the iterator
> may represent contiguous pages.
> 
> MSG_SPLICE_PAGES enables skb_splice_from_iter() which checks all the
> pages it sends with sendpage_ok().
> 
> When nvme_tcp_try_send_data() sends an iterator that the first page is
> sendable, but one of the other pages isn't skb_splice_from_iter() warns
> and aborts the data transfer.
> 
> Using the new helper sendpages_ok() in order to disable MSG_SPLICE_PAGES
> solves the issue.
> 
> Signed-off-by: Ofir Gal <ofir.gal@...umez.com>
> ---
>   drivers/nvme/host/tcp.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
> index 8b5e4327fe83..9f0fd14cbcb7 100644
> --- a/drivers/nvme/host/tcp.c
> +++ b/drivers/nvme/host/tcp.c
> @@ -1051,7 +1051,7 @@ static int nvme_tcp_try_send_data(struct nvme_tcp_request *req)
>   		else
>   			msg.msg_flags |= MSG_MORE;
>   
> -		if (!sendpage_ok(page))
> +		if (!sendpages_ok(page, len, offset))
>   			msg.msg_flags &= ~MSG_SPLICE_PAGES;
>   
>   		bvec_set_page(&bvec, page, len, offset);
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich