ipoib - problems with offloading checksums

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Problem - offloading checksumms does not work, although the Kernel documentation indicates it should

       [root@eha001 ~]# ethtool -K ib0 tx on
       Cannot set device tx-checksumming settings: Operation not supported

IPoIB connected mode is switched of:

       SET_IPOIB_CM=no

This problem exists on both Mellanox/Qlogic cards with either SW stack mentioned. Could anyone advise on this problem?


Hardware: Intel EP server with 2x "Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz"
IB cards:  QLogic Corp. IBA7322 QDR InfiniBand HCA (rev 02) , Mellanox Technologies MT27500 Family [ConnectX-3]

OS: Redhat 6.4, kernel updated to latest RH supplied kernel via KSplice technology 
InfiniBand Software: tried IntelIB-IFS.RHEL6-x86_64.7.2.1.1.22 (based on OFED 1.5.4.1) or OFED-3.5-MIC-alpha1


Many thanks
Michael


------------------------------------------------------------------------
Michael Hebenstreit                 Senior Cluster Architect
Intel Corporation, MS: RR1-105/H14  Software and Services Group/DCE
4100 Sara Road                      Tel.:   +1 505-794-3144 
Rio Rancho, NM 87124
UNITED STATES                       E-mail: michael.hebenstreit@xxxxxxxxx

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