linux-kernel - Re: [PATCH net-next] sctp: deduplicate identical skb_checksum

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Date:   Thu, 30 May 2019 14:36:04 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     mcroce@...hat.com
Cc:     linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        vyasevich@...il.com, nhorman@...driver.com,
        marcelo.leitner@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] sctp: deduplicate identical skb_checksum_ops

From: Matteo Croce <mcroce@...hat.com>
Date: Wed, 29 May 2019 17:39:41 +0200

> The same skb_checksum_ops struct is defined twice in two different places,
> leading to code duplication. Declare it as a global variable into a common
> header instead of allocating it on the stack on each function call.
> bloat-o-meter reports a slight code shrink.
> 
> add/remove: 1/1 grow/shrink: 0/10 up/down: 128/-1282 (-1154)
> Function                                     old     new   delta
> sctp_csum_ops                                  -     128    +128
> crc32c_csum_ops                               16       -     -16
> sctp_rcv                                    6616    6583     -33
> sctp_packet_pack                            4542    4504     -38
> nf_conntrack_sctp_packet                    4980    4926     -54
> execute_masked_set_action                   6453    6389     -64
> tcf_csum_sctp                                575     428    -147
> sctp_gso_segment                            1292    1126    -166
> sctp_csum_check                              579     412    -167
> sctp_snat_handler                            957     772    -185
> sctp_dnat_handler                           1321    1132    -189
> l4proto_manip_pkt                           2536    2313    -223
> Total: Before=359297613, After=359296459, chg -0.00%
> 
> Reviewed-by: Xin Long <lucien.xin@...il.com>
> Signed-off-by: Matteo Croce <mcroce@...hat.com>

Applied.