From: Santosh Shilimkar <santosh.shilimkar@oracle.com>
To: Sowmini Varadhan <sowmini.varadhan@oracle.com>,
netdev@vger.kernel.org, willemdebruijn.kernel@gmail.com
Cc: davem@davemloft.net, rds-devel@oss.oracle.com
Subject: Re: [PATCH v3 net-next 5/7] rds: zerocopy Tx support.
Date: Thu, 15 Feb 2018 11:47:56 -0800 [thread overview]
Message-ID: <ba7e66cd-d0fe-fbf8-d03f-6fa778c47dd4@oracle.com> (raw)
In-Reply-To: <ecd36457aabd293fa245a49e51d420f133ab4d5a.1518718761.git.sowmini.varadhan@oracle.com>
On 2/15/2018 10:49 AM, Sowmini Varadhan wrote:
> If the MSG_ZEROCOPY flag is specified with rds_sendmsg(), and,
> if the SO_ZEROCOPY socket option has been set on the PF_RDS socket,
> application pages sent down with rds_sendmsg() are pinned.
>
> The pinning uses the accounting infrastructure added by
> Commit a91dbff551a6 ("sock: ulimit on MSG_ZEROCOPY pages")
>
> The payload bytes in the message may not be modified for the
> duration that the message has been pinned. A multi-threaded
> application using this infrastructure may thus need to be notified
> about send-completion so that it can free/reuse the buffers
> passed to rds_sendmsg(). Notification of send-completion will
> identify each message-buffer by a cookie that the application
> must specify as ancillary data to rds_sendmsg().
> The ancillary data in this case has cmsg_level == SOL_RDS
> and cmsg_type == RDS_CMSG_ZCOPY_COOKIE.
>
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
> ---
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
next prev parent reply other threads:[~2018-02-15 19:48 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-15 18:49 [PATCH v3 net-next 0/7] RDS: zerocopy support Sowmini Varadhan
2018-02-15 18:49 ` [PATCH v3 net-next 1/7] skbuff: export mm_[un]account_pinned_pages for other modules Sowmini Varadhan
2018-02-15 20:41 ` Willem de Bruijn
2018-02-15 18:49 ` [PATCH v3 net-next 2/7] rds: hold a sock ref from rds_message to the rds_sock Sowmini Varadhan
2018-02-15 19:45 ` Santosh Shilimkar
2018-02-15 18:49 ` [PATCH v3 net-next 3/7] sock: permit SO_ZEROCOPY on PF_RDS socket Sowmini Varadhan
2018-02-15 20:41 ` Willem de Bruijn
2018-02-15 18:49 ` [PATCH v3 net-next 4/7] rds: support for zcopy completion notification Sowmini Varadhan
2018-02-15 19:46 ` Santosh Shilimkar
2018-02-15 20:42 ` Willem de Bruijn
2018-02-15 18:49 ` [PATCH v3 net-next 5/7] rds: zerocopy Tx support Sowmini Varadhan
2018-02-15 19:47 ` Santosh Shilimkar [this message]
2018-02-15 20:42 ` Willem de Bruijn
2018-02-15 18:49 ` [PATCH v3 net-next 6/7] selftests/net: add support for PF_RDS sockets Sowmini Varadhan
2018-02-15 20:42 ` Willem de Bruijn
2018-02-15 18:49 ` [PATCH v3 net-next 7/7] selftests/net: add zerocopy support for PF_RDS test case Sowmini Varadhan
2018-02-15 20:43 ` Willem de Bruijn
2018-02-16 21:13 ` [PATCH v3 net-next 0/7] RDS: zerocopy support David Miller
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