netdev - Re: [PATCH v3 net-next 4/7] rds: support for zcopy completion notification

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Date:   Thu, 15 Feb 2018 15:42:05 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Santosh Shilimkar <santosh.shilimkar@...cle.com>
Cc:     Sowmini Varadhan <sowmini.varadhan@...cle.com>,
        Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>, rds-devel@....oracle.com
Subject: Re: [PATCH v3 net-next 4/7] rds: support for zcopy completion notification

On Thu, Feb 15, 2018 at 2:46 PM, Santosh Shilimkar
<santosh.shilimkar@...cle.com> wrote:
> On 2/15/2018 10:49 AM, Sowmini Varadhan wrote:
>>
>> RDS removes a datagram (rds_message) from the retransmit queue when
>> an ACK is received. The ACK indicates that the receiver has queued
>> the RDS datagram, so that the sender can safely forget the datagram.
>> When all references to the rds_message are quiesced, rds_message_purge
>> is called to release resources used by the rds_message
>>
>> If the datagram to be removed had pinned pages set up, add
>> an entry to the rs->rs_znotify_queue so that the notifcation
>> will be sent up via rds_rm_zerocopy_callback() when the
>> rds_message is eventually freed by rds_message_purge.
>>
>> rds_rm_zerocopy_callback() attempts to batch the number of cookies
>> sent with each notification  to a max of SO_EE_ORIGIN_MAX_ZCOOKIES.
>> This is achieved by checking the tail skb in the sk_error_queue:
>> if this has room for one more cookie, the cookie from the
>> current notification is added; else a new skb is added to the
>> sk_error_queue. Every invocation of rds_rm_zerocopy_callback() will
>> trigger a ->sk_error_report to notify the application.
>>
>> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
>> ---
>
> Acked-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>

Acked-by: Willem de Bruijn <willemb@...gle.com>