net/smc: introduce smc_pnet_find_alt_roce()
Introduce a new function in smc_pnet.c that searches for an alternate IB device, using an existing link group and a primary IB device. The alternate IB device needs to be active and must have the same PNETID as the link group. Signed-off-by: NKarsten Graul <kgraul@linux.ibm.com> Reviewed-by: NUrsula Braun <ubraun@linux.ibm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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