Hi Erez,
Thanks for the reply.
Solaris has iSER support and Solaris manual says that Solaris iSER should work on any IB HCA. Pl see the link Configuring iSCSI Devices With COMSTAR - Oracle Solaris Administration: Devices and File Systems . Theoretically, it should work on Mellanox HCA, whether it has been tried, if yes, that will be useful link.
Thanks,
Anil