IB/ehca: MR/MW structure refactoring

- Rename struct ehca_mr fields to clearly distinguish between kernel
  and HW page size.
- Sort struct ehca_mr_pginfo into a common part and a union containing
  specific fields for physical, user and fast MR

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ehca/ehca_classes.h

@@ -204,8 +204,8 @@ struct ehca_mr {
 	spinlock_t mrlock;
 
 	enum ehca_mr_flag flags;
-	u32 num_pages;		/* number of MR pages */
-	u32 num_4k;		/* number of 4k "page" portions to form MR */
+	u32 num_kpages;		/* number of kernel pages */
+	u32 num_hwpages;	/* number of hw pages to form MR */
 	int acl;		/* ACL (stored here for usage in reregister) */
 	u64 *start;		/* virtual start address (stored here for */
 	                        /* usage in reregister) */
@@ -217,9 +217,6 @@ struct ehca_mr {
 	/* fw specific data */
 	struct ipz_mrmw_handle ipz_mr_handle;	/* MR handle for h-calls */
 	struct h_galpas galpas;
-	/* data for userspace bridge */
-	u32 nr_of_pages;
-	void *pagearray;
 };
 
 struct ehca_mw {
@@ -241,26 +238,29 @@ enum ehca_mr_pgi_type {
 
 struct ehca_mr_pginfo {
 	enum ehca_mr_pgi_type type;
-	u64 num_pages;
-	u64 page_cnt;
-	u64 num_4k;       /* number of 4k "page" portions */
-	u64 page_4k_cnt;  /* counter for 4k "page" portions */
-	u64 next_4k;      /* next 4k "page" portion in buffer/chunk/listelem */
+	u64 num_kpages;
+	u64 kpage_cnt;
+	u64 num_hwpages;     /* number of hw pages */
+	u64 hwpage_cnt;      /* counter for hw pages */
+	u64 next_hwpage;     /* next hw page in buffer/chunk/listelem */
 
-	/* type EHCA_MR_PGI_PHYS section */
-	int num_phys_buf;
-	struct ib_phys_buf *phys_buf_array;
-	u64 next_buf;
-
-	/* type EHCA_MR_PGI_USER section */
-	struct ib_umem *region;
-	struct ib_umem_chunk *next_chunk;
-	u64 next_nmap;
-
-	/* type EHCA_MR_PGI_FMR section */
-	u64 *page_list;
-	u64 next_listelem;
-	/* next_4k also used within EHCA_MR_PGI_FMR */
+	union {
+		struct { /* type EHCA_MR_PGI_PHYS section */
+			int num_phys_buf;
+			struct ib_phys_buf *phys_buf_array;
+			u64 next_buf;
+		} phy;
+		struct { /* type EHCA_MR_PGI_USER section */
+			struct ib_umem *region;
+			struct ib_umem_chunk *next_chunk;
+			u64 next_nmap;
+		} usr;
+		struct { /* type EHCA_MR_PGI_FMR section */
+			u64 fmr_pgsize;
+			u64 *page_list;
+			u64 next_listelem;
+		} fmr;
+	} u;
 };
 
 /* output parameters for MR/FMR hipz calls */