RDMA/srp: Remove support for FMR memory registration

FMR is not supported on most recent RDMA devices (that use fast memory
registration mechanism). Also, FMR was recently removed from NFS/RDMA
ULP.

Link: https://lore.kernel.org/r/2-v3-f58e6669d5d3+2cf-fmr_removal_jgg@mellanox.comSigned-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Israel Rukshin <israelr@mellanox.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/ulp/srp/ib_srp.h

@@ -44,7 +44,6 @@
 #include <rdma/ib_verbs.h>
 #include <rdma/ib_sa.h>
 #include <rdma/ib_cm.h>
-#include <rdma/ib_fmr_pool.h>
 #include <rdma/rdma_cm.h>
 
 enum {
@@ -95,8 +94,7 @@ enum srp_iu_type {
 /*
  * @mr_page_mask: HCA memory registration page mask.
  * @mr_page_size: HCA memory registration page size.
- * @mr_max_size: Maximum size in bytes of a single FMR / FR registration
- *   request.
+ * @mr_max_size: Maximum size in bytes of a single FR registration request.
  */
 struct srp_device {
 	struct list_head	dev_list;
@@ -107,9 +105,7 @@ struct srp_device {
 	int			mr_page_size;
 	int			mr_max_size;
 	int			max_pages_per_mr;
-	bool			has_fmr;
 	bool			has_fr;
-	bool			use_fmr;
 	bool			use_fast_reg;
 };
 
@@ -127,11 +123,7 @@ struct srp_host {
 struct srp_request {
 	struct scsi_cmnd       *scmnd;
 	struct srp_iu	       *cmd;
-	union {
-		struct ib_pool_fmr **fmr_list;
-		struct srp_fr_desc **fr_list;
-	};
-	u64		       *map_page;
+	struct srp_fr_desc     **fr_list;
 	struct srp_direct_buf  *indirect_desc;
 	dma_addr_t		indirect_dma_addr;
 	short			nmdesc;
@@ -155,10 +147,7 @@ struct srp_rdma_ch {
 	struct ib_cq	       *send_cq;
 	struct ib_cq	       *recv_cq;
 	struct ib_qp	       *qp;
-	union {
-		struct ib_fmr_pool     *fmr_pool;
-		struct srp_fr_pool     *fr_pool;
-	};
+	struct srp_fr_pool     *fr_pool;
 	uint32_t		max_it_iu_len;
 	uint32_t		max_ti_iu_len;
 	u8			max_imm_sge;
@@ -319,19 +308,15 @@ struct srp_fr_pool {
  * @pages:	    Array with DMA addresses of pages being considered for
  *		    memory registration.
  * @base_dma_addr:  DMA address of the first page that has not yet been mapped.
- * @dma_len:	    Number of bytes that will be registered with the next
- *		    FMR or FR memory registration call.
+ * @dma_len:	    Number of bytes that will be registered with the next FR
+ *                  memory registration call.
  * @total_len:	    Total number of bytes in the sg-list being mapped.
  * @npages:	    Number of page addresses in the pages[] array.
- * @nmdesc:	    Number of FMR or FR memory descriptors used for mapping.
+ * @nmdesc:	    Number of FR memory descriptors used for mapping.
  * @ndesc:	    Number of SRP buffer descriptors that have been filled in.
  */
 struct srp_map_state {
 	union {
-		struct {
-			struct ib_pool_fmr **next;
-			struct ib_pool_fmr **end;
-		} fmr;
 		struct {
 			struct srp_fr_desc **next;
 			struct srp_fr_desc **end;