netdev - Re: [PATCH v5 1/3] net: introduce helper sendpages

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Message-ID: <20240722174539.461bd2dd@kernel.org>
Date: Mon, 22 Jul 2024 17:45:39 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Ofir Gal <ofir.gal@...umez.com>
Cc: davem@...emloft.net, linux-block@...r.kernel.org,
 linux-nvme@...ts.infradead.org, netdev@...r.kernel.org,
 ceph-devel@...r.kernel.org, dhowells@...hat.com, edumazet@...gle.com,
 pabeni@...hat.com, kbusch@...nel.org, axboe@...nel.dk, hch@....de,
 sagi@...mberg.me, philipp.reisner@...bit.com, lars.ellenberg@...bit.com,
 christoph.boehmwalder@...bit.com, idryomov@...il.com, xiubli@...hat.com
Subject: Re: [PATCH v5 1/3] net: introduce helper sendpages_ok()

On Thu, 18 Jul 2024 11:45:12 +0300 Ofir Gal wrote:
> Network drivers are using sendpage_ok() to check the first page of an
> iterator in order to disable MSG_SPLICE_PAGES. The iterator can
> represent list of contiguous pages.
> 
> When MSG_SPLICE_PAGES is enabled skb_splice_from_iter() is being used,
> it requires all pages in the iterator to be sendable. Therefore it needs
> to check that each page is sendable.
> 
> The patch introduces a helper sendpages_ok(), it returns true if all the
> contiguous pages are sendable.
> 
> Drivers who want to send contiguous pages with MSG_SPLICE_PAGES may use
> this helper to check whether the page list is OK. If the helper does not
> return true, the driver should remove MSG_SPLICE_PAGES flag.

Acked-by: Jakub Kicinski <kuba@...nel.org>