netdev - Re: [PATCH RFC net-next v4 0/7] net: improve support for SCTP checksums

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Date:   Thu, 27 Apr 2017 09:41:38 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Davide Caratti <dcaratti@...hat.com>
Cc:     Tom Herbert <tom@...bertland.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        David Laight <David.Laight@...lab.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-sctp@...r.kernel.org
Subject: Re: [PATCH RFC net-next v4 0/7] net: improve support for SCTP
 checksums

On Thu, Apr 20, 2017 at 03:38:06PM +0200, Davide Caratti wrote:
> hello Tom,
> 
> On Fri, 2017-04-07 at 11:11 -0700, Tom Herbert wrote:
> > maybe just call it csum_not_ip then. Then just do "if
> > (unlikely(skb->csum_not_ip)) ..."
> 
> Ok, done. V4 uses this bit for SCTP only and leaves unmodified behavior
> when offloaded FCoE frames are processed. Further work is still possible
> to extend this fix for FCoE, if needed, either by using additional sk_buff
> bits, or using skb->csum_not_ip and use other data (e.g. skb->csum_offset)
> to distinguish SCTP from FCoE.
> 
> > the only case where this new bit is relevant is when
> > CHECKSUM_PARTIAL for a CRC is being done. When it's set for offloading
> > sctp crc it must be set. When CRC is resolved, in the helper for
> > instance, it must be cleared.
> 
> in V4 the bit is set when SCTP packets with offloaded checksum are
> generated; the bit is cleared when CRC32c is resolved for such packets
> (i.e. skb->ip_summed transitions from CHECKSUM_PARTIAL to CHECKSUM_NONE).
> 
> Any feedbacks are appreciated!
> thank you in advance,
> --
> davide
> 
> 
> Davide Caratti (7):
>   skbuff: add stub to help computing crc32c on SCTP packets
>   net: introduce skb_crc32c_csum_help
>   sk_buff: remove support for csum_bad in sk_buff
>   net: use skb->csum_not_inet to identify packets needing crc32c
>   net: more accurate checksumming in validate_xmit_skb()
>   openvswitch: more accurate checksumming in queue_userspace_packet()
>   sk_buff.h: improve description of CHECKSUM_{COMPLETE,UNNECESSARY}

Other than the comments I did on patch 2, this series LGTM.


> 
>  Documentation/networking/checksum-offloads.txt   | 11 +++--
>  drivers/net/ethernet/aquantia/atlantic/aq_ring.c |  2 +-
>  include/linux/netdevice.h                        |  8 +--
>  include/linux/skbuff.h                           | 58 +++++++++-------------
>  net/bridge/netfilter/nft_reject_bridge.c         |  5 +-
>  net/core/dev.c                                   | 63 +++++++++++++++++++++---
>  net/core/skbuff.c                                | 24 +++++++++
>  net/ipv4/netfilter/nf_reject_ipv4.c              |  2 +-
>  net/ipv6/netfilter/nf_reject_ipv6.c              |  3 --
>  net/openvswitch/datapath.c                       |  2 +-
>  net/sched/act_csum.c                             |  1 +
>  net/sctp/offload.c                               |  8 +++
>  net/sctp/output.c                                |  1 +
>  13 files changed, 128 insertions(+), 60 deletions(-)
> 
> -- 
> 2.7.4
> 
> --
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