qed: add support for different page sizes for chains

Extend current infrastructure to store chain page size in a struct
and use it in all functions instead of fixed QED_CHAIN_PAGE_SIZE.
Its value remains the default one, but can be overridden in
qed_chain_init_params before chain allocation.

Signed-off-by: Alexander Lobakin <alobakin@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/infiniband/hw/qedr/verbs.c

@@ -1960,9 +1960,11 @@ qedr_iwarp_create_kernel_qp(struct qedr_dev *dev,
 
 	in_params->sq_num_pages = QED_CHAIN_PAGE_CNT(n_sq_elems,
 						     QEDR_SQE_ELEMENT_SIZE,
+						     QED_CHAIN_PAGE_SIZE,
 						     QED_CHAIN_MODE_PBL);
 	in_params->rq_num_pages = QED_CHAIN_PAGE_CNT(n_rq_elems,
 						     QEDR_RQE_ELEMENT_SIZE,
+						     QED_CHAIN_PAGE_SIZE,
 						     QED_CHAIN_MODE_PBL);
 
 	qp->qed_qp = dev->ops->rdma_create_qp(dev->rdma_ctx,