How far back does rdma-core X supports the kernel Y?

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Hi All,
I've installed rdma-core-15 on kernel 4.3 and ran into issues.

It seems this kernel doesn't include the following patch:
https://github.com/torvalds/linux/commit/aa744cc01fe0f21dfbe2744d3fd5f2fb3244c9b3

So IB_QP_SMAC is present in kernel 4.3 but not in rdma-core-15.
This caused a failure here:

int ibv_cmd_modify_qp(struct ibv_qp *qp, struct ibv_qp_attr *attr,
                      int attr_mask,
                      struct ibv_modify_qp *cmd, size_t cmd_size)
{
        /*
         * Masks over IBV_QP_DEST_QPN are only supported by
         * ibv_cmd_modify_qp_ex.
         */
        if (attr_mask & ~((IBV_QP_DEST_QPN << 1) - 1))
                return EOPNOTSUPP;
        ...
}

Do we expect these versions to operate?
If not, from what version do we support backward compatibility?
Are there any other backward compatibility issues you are aware of?

Thanks,
Ram

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