[PATCHv3,net] {xfrm, sctp} Stick to software crc32 even if hardware is capable of that

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@windriver.com>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
---
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(-)

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@windriver.com>
> Cc: Vlad Yasevich <vyasevich@gmail.com>
> Cc: Neil Horman <nhorman@tuxdriver.com>
> Cc: Steffen Klassert <steffen.klassert@secunet.com>
> Acked-by: Vlad Yasevich <vyasevich@gmail.com>

Looks good to me.

-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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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@windriver.com>
>> Cc: Vlad Yasevich <vyasevich@gmail.com>
>> Cc: Neil Horman <nhorman@tuxdriver.com>
>> Cc: Steffen Klassert <steffen.klassert@secunet.com>
>> Acked-by: Vlad Yasevich <vyasevich@gmail.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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On 2013年10月16日 09:52, Vlad Yasevich wrote:
> 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@windriver.com>
>>> Cc: Vlad Yasevich <vyasevich@gmail.com>
>>> Cc: Neil Horman <nhorman@tuxdriver.com>
>>> Cc: Steffen Klassert <steffen.klassert@secunet.com>
>>> Acked-by: Vlad Yasevich <vyasevich@gmail.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.

:( Sorry for the inconvenience. Stable tree might hurts also.