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Date: Tue, 15 Oct 2013 21:52:01 -0400
From: Vlad Yasevich <vyasevich@...il.com>
To: Fan Du <fan.du@...driver.com>, nhorman@...driver.com
CC: steffen.klassert@...unet.com, davem@...emloft.net,
netdev@...r.kernel.org
Subject: Re: [PATCHv3 net] {xfrm, sctp} Stick to software crc32 even if hardware
is capable of that
On 10/15/2013 09:05 PM, Vlad Yasevich wrote:
> On 10/15/2013 05:19 AM, Fan Du wrote:
>> igb/ixgbe have hardware sctp checksum support, when this feature is
>> enabled
>> and also IPsec is armed to protect sctp traffic, ugly things happened as
>> xfrm_output checks CHECKSUM_PARTIAL to do check sum operation(sum
>> every thing
>> up and pack the 16bits result in the checksum field). The result is fail
>> establishment of sctp communication.
>>
>> Signed-off-by: Fan Du <fan.du@...driver.com>
>> Cc: Vlad Yasevich <vyasevich@...il.com>
>> Cc: Neil Horman <nhorman@...driver.com>
>> Cc: Steffen Klassert <steffen.klassert@...unet.com>
>> Acked-by: Vlad Yasevich <vyasevich@...il.com>
>
> Looks good to me.
>
Just tryied applying this and looks like you based this on net-next.
This fixes a rather ugly bug when checksum offloading is done.
I am going to rebase this and re-submit for net.
-vlad
> -vlad
>
>> ---
>> v3:
>> - Rename is_xfrm_armed by dst_xfrm
>> - Move this funtion in include/net/dst.h
>>
>> v2:
>> - Split v1 into two separate patches.
>>
>> ---
>> include/net/dst.h | 12 ++++++++++++
>> net/sctp/output.c | 3 ++-
>> 2 files changed, 14 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/net/dst.h b/include/net/dst.h
>> index 211dcf1..44995c1 100644
>> --- a/include/net/dst.h
>> +++ b/include/net/dst.h
>> @@ -478,10 +478,22 @@ static inline struct dst_entry
>> *xfrm_lookup(struct net *net,
>> {
>> return dst_orig;
>> }
>> +
>> +static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
>> +{
>> + return NULL;
>> +}
>> +
>> #else
>> struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry
>> *dst_orig,
>> const struct flowi *fl, struct sock *sk,
>> int flags);
>> +
>> +/* skb attached with this dst needs transformation if dst->xfrm is
>> valid */
>> +static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
>> +{
>> + return dst->xfrm;
>> +}
>> #endif
>>
>> #endif /* _NET_DST_H */
>> diff --git a/net/sctp/output.c b/net/sctp/output.c
>> index 0ac3a65..24b3718 100644
>> --- a/net/sctp/output.c
>> +++ b/net/sctp/output.c
>> @@ -536,7 +536,8 @@ int sctp_packet_transmit(struct sctp_packet *packet)
>> * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
>> */
>> if (!sctp_checksum_disable) {
>> - if (!(dst->dev->features & NETIF_F_SCTP_CSUM)) {
>> + if (!(dst->dev->features & NETIF_F_SCTP_CSUM) ||
>> + (dst_xfrm(dst) != NULL)) {
>> __u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);
>>
>> /* 3) Put the resultant value into the checksum field in
>> the
>>
>
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