netdev - Re: [PATCH V2 net-next 4/7] rds: support for zcopy completion notification

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Message-ID: <20180215120331.GE24652@oracle.com>
Date:   Thu, 15 Feb 2018 07:03:31 -0500
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>, rds-devel@....oracle.com,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>
Subject: Re: [PATCH V2 net-next 4/7] rds: support for zcopy completion
 notification

On (02/14/18 19:41), Willem de Bruijn wrote:
> 
> One more thing: this code notifies that the operation succeeded, but
> the data was copied in the process. It does not have to be set otherwise.

I see. this one was a bit confusing for me (hence the copy/paste) -
maybe because the TCP/UDP/PACKET case is a bit different from RDS,
and sendmsg may find that it has to switch from zcopy to bcopy 
after the sendmsg() itself has returned, but this cannot happen
for RDS (thus I should never set this code?).

Is it ok if I fix this in the next round or do you think
this warrants a V3?

--Sowmini