linux-kernel - Re: [PATCH net-next 0/3] rxrpc: Tx length parameter

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Date:   Thu, 08 Jun 2017 11:42:03 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     dhowells@...hat.com
Cc:     netdev@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/3] rxrpc: Tx length parameter

From: David Howells <dhowells@...hat.com>
Date: Wed, 07 Jun 2017 22:12:32 +0100

> Here's a set of patches that allows someone initiating a client call with
> AF_RXRPC to indicate upfront the total amount of data that will be
> transmitted.  This will allow AF_RXRPC to encrypt directly from source
> buffer to packet rather than having to copy into the buffer and only
> encrypt when it's full (the encrypted portion of the packet starts with a
> length and so we can't encrypt until we know what the length will be).
> 
> The three patches are:
> 
>  (1) Provide a means of finding out what control message types are actually
>      supported.  EINVAL is reported if an unsupported cmsg type is seen, so
>      we don't want to set the new cmsg unless we know it will be accepted.
> 
>  (2) Consolidate some stuff into a struct to reduce the parameter count on
>      the function that parses the cmsg buffer.
> 
>  (3) Introduce the RXRPC_TX_LENGTH cmsg.  This can be provided on the first
>      sendmsg() that contributes data to a client call request or a service
>      call reply.  If provided, the user must provide exactly that amount of
>      data or an error will be incurred.
> 
> Changes in version 2:
> 
>  (*) struct rxrpc_send_params::tx_total_len should be s64 not u64.  Thanks to
>      Julia Lawall for reporting this.
 ...
> Tagged thusly:
> 
> 	git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
> 	rxrpc-rewrite-20170607-v2

Pulled, thanks David.