netdev - [PATCH v2] sctp: keep fragmentation point aligned to word size

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Message-Id: <1458400663-25558-1-git-send-email-marcelo.leitner@gmail.com>
Date:	Sat, 19 Mar 2016 12:17:43 -0300
From:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:	netdev@...r.kernel.org
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Neil Horman <nhorman@...driver.com>,
	Vlad Yasevich <vyasevich@...il.com>, linux-sctp@...r.kernel.org
Subject: [PATCH v2] sctp: keep fragmentation point aligned to word size

If the user supply a different fragmentation point or if there is a
network header that cause it to not be aligned, force it to be aligned.

Fragmentation point at a value that is not aligned is not optimal.  It
causes extra padding to be used and has just no pros.

v2:
 - Make use of the new WORD_TRUNC macro

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
---
 include/net/sctp/sctp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index ad2136caa7d65fdc0f51e4c7ad3a526c2f39660d..65521cfdcadeee35d61f280165a387cc2164ab6d 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -431,7 +431,7 @@ static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
 	if (asoc->user_frag)
 		frag = min_t(int, frag, asoc->user_frag);
 
-	frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
+	frag = WORD_TRUNC(min_t(int, frag, SCTP_MAX_CHUNK_LEN));
 
 	return frag;
 }
-- 
2.5.0