IB/ipoib: Add capability to switch between datagram and connected mode
This is the prerequisite modification to the ipoib ulp to allow a rdma netdev to obtain the default ndo ops for init/uninit/open/close. This is accomplished by setting the netdev ops field within the callback function passed to the netdev allocation routine which in turn was passed into the rdma netdev allocation routine. This allows the rdma netdev to call back into the ulp to create the resources required for connected mode operation. Additionally as the ulp is not re-entrant, when switching modes, the number of real tx queues is set to 1 for the connected mode. For datagram mode the number of real tx queues is set to the actual number of tx queues specified at the netdev's allocation. For the internal ulp netdev the number of tx queues defaults to 1. It is up to the rdma netdev to specify the actual number it can support. When the driver does not support a rdma netdev for acceleration, (-ENOTSUPPORTED return code or the verbs function for allocation is NULL) the ipoib ulp functions are unaffected by using the internal netdev allocated by the ipoib ulp. Link: https://lore.kernel.org/r/20200511160706.173205.19086.stgit@awfm-01.aw.intel.comReviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com> Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: NGary Leshner <Gary.S.Leshner@intel.com> Signed-off-by: NKaike Wan <kaike.wan@intel.com> Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>
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