drivers/scsi/be2iscsi/be.h

   1 /**
   2  * Copyright (C) 2005 - 2013 Emulex
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation.  The full GNU General
   8  * Public License is included in this distribution in the file called COPYING.
   9  *
  10  * Contact Information:
  11  * linux-drivers@emulex.com
  12  *
  13  * Emulex
  14  * 3333 Susan Street
  15  * Costa Mesa, CA 92626
  16  */
  17
  18 #ifndef BEISCSI_H
  19 #define BEISCSI_H
  20
  21 #include <linux/pci.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/blk-iopoll.h>
  24 #define FW_VER_LEN      32
  25 #define MCC_Q_LEN       128
  26 #define MCC_CQ_LEN      256
  27 #define MAX_MCC_CMD     16
  28 /* BladeEngine Generation numbers */
  29 #define BE_GEN2 2
  30 #define BE_GEN3 3
  31 #define BE_GEN4 4
  32 struct be_dma_mem {
  33         void *va;
  34         dma_addr_t dma;
  35         u32 size;
  36 };
  37
  38 struct be_queue_info {
  39         struct be_dma_mem dma_mem;
  40         u16 len;
  41         u16 entry_size;         /* Size of an element in the queue */
  42         u16 id;
  43         u16 tail, head;
  44         bool created;
  45         atomic_t used;          /* Number of valid elements in the queue */
  46 };
  47
  48 static inline u32 MODULO(u16 val, u16 limit)
  49 {
  50         WARN_ON(limit & (limit - 1));
  51         return val & (limit - 1);
  52 }
  53
  54 static inline void index_inc(u16 *index, u16 limit)
  55 {
  56         *index = MODULO((*index + 1), limit);
  57 }
  58
  59 static inline void *queue_head_node(struct be_queue_info *q)
  60 {
  61         return q->dma_mem.va + q->head * q->entry_size;
  62 }
  63
  64 static inline void *queue_get_wrb(struct be_queue_info *q, unsigned int wrb_num)
  65 {
  66         return q->dma_mem.va + wrb_num * q->entry_size;
  67 }
  68
  69 static inline void *queue_tail_node(struct be_queue_info *q)
  70 {
  71         return q->dma_mem.va + q->tail * q->entry_size;
  72 }
  73
  74 static inline void queue_head_inc(struct be_queue_info *q)
  75 {
  76         index_inc(&q->head, q->len);
  77 }
  78
  79 static inline void queue_tail_inc(struct be_queue_info *q)
  80 {
  81         index_inc(&q->tail, q->len);
  82 }
  83
  84 /*ISCSI */
  85
  86 struct be_eq_obj {
  87         bool todo_mcc_cq;
  88         bool todo_cq;
  89         struct be_queue_info q;
  90         struct beiscsi_hba *phba;
  91         struct be_queue_info *cq;
  92         struct work_struct work_cqs; /* Work Item */
  93         struct blk_iopoll       iopoll;
  94 };
  95
  96 struct be_mcc_obj {
  97         struct be_queue_info q;
  98         struct be_queue_info cq;
  99 };
 100
 101 struct be_ctrl_info {
 102         u8 __iomem *csr;
 103         u8 __iomem *db;         /* Door Bell */
 104         u8 __iomem *pcicfg;     /* PCI config space */
 105         struct pci_dev *pdev;
 106
 107         /* Mbox used for cmd request/response */
 108         spinlock_t mbox_lock;   /* For serializing mbox cmds to BE card */
 109         struct be_dma_mem mbox_mem;
 110         /* Mbox mem is adjusted to align to 16 bytes. The allocated addr
 111          * is stored for freeing purpose */
 112         struct be_dma_mem mbox_mem_alloced;
 113
 114         /* MCC Rings */
 115         struct be_mcc_obj mcc_obj;
 116         spinlock_t mcc_lock;    /* For serializing mcc cmds to BE card */
 117         spinlock_t mcc_cq_lock;
 118
 119         wait_queue_head_t mcc_wait[MAX_MCC_CMD + 1];
 120         unsigned int mcc_tag[MAX_MCC_CMD];
 121         unsigned int mcc_numtag[MAX_MCC_CMD + 1];
 122         unsigned short mcc_alloc_index;
 123         unsigned short mcc_free_index;
 124         unsigned int mcc_tag_available;
 125 };
 126
 127 #include "be_cmds.h"
 128
 129 #define PAGE_SHIFT_4K 12
 130 #define PAGE_SIZE_4K (1 << PAGE_SHIFT_4K)
 131 #define mcc_timeout             120000 /* 12s timeout */
 132
 133 /* Returns number of pages spanned by the data starting at the given addr */
 134 #define PAGES_4K_SPANNED(_address, size)                                \
 135                 ((u32)((((size_t)(_address) & (PAGE_SIZE_4K - 1)) +     \
 136                         (size) + (PAGE_SIZE_4K - 1)) >> PAGE_SHIFT_4K))
 137
 138 /* Returns bit offset within a DWORD of a bitfield */
 139 #define AMAP_BIT_OFFSET(_struct, field)                                 \
 140                 (((size_t)&(((_struct *)0)->field))%32)
 141
 142 /* Returns the bit mask of the field that is NOT shifted into location. */
 143 static inline u32 amap_mask(u32 bitsize)
 144 {
 145         return (bitsize == 32 ? 0xFFFFFFFF : (1 << bitsize) - 1);
 146 }
 147
 148 static inline void amap_set(void *ptr, u32 dw_offset, u32 mask,
 149                                         u32 offset, u32 value)
 150 {
 151         u32 *dw = (u32 *) ptr + dw_offset;
 152         *dw &= ~(mask << offset);
 153         *dw |= (mask & value) << offset;
 154 }
 155
 156 #define AMAP_SET_BITS(_struct, field, ptr, val)                         \
 157                 amap_set(ptr,                                           \
 158                         offsetof(_struct, field)/32,                    \
 159                         amap_mask(sizeof(((_struct *)0)->field)),       \
 160                         AMAP_BIT_OFFSET(_struct, field),                \
 161                         val)
 162
 163 static inline u32 amap_get(void *ptr, u32 dw_offset, u32 mask, u32 offset)
 164 {
 165         u32 *dw = ptr;
 166         return mask & (*(dw + dw_offset) >> offset);
 167 }
 168
 169 #define AMAP_GET_BITS(_struct, field, ptr)                              \
 170                 amap_get(ptr,                                           \
 171                         offsetof(_struct, field)/32,                    \
 172                         amap_mask(sizeof(((_struct *)0)->field)),       \
 173                         AMAP_BIT_OFFSET(_struct, field))
 174
 175 #define be_dws_cpu_to_le(wrb, len) swap_dws(wrb, len)
 176 #define be_dws_le_to_cpu(wrb, len) swap_dws(wrb, len)
 177 static inline void swap_dws(void *wrb, int len)
 178 {
 179 #ifdef __BIG_ENDIAN
 180         u32 *dw = wrb;
 181         WARN_ON(len % 4);
 182         do {
 183                 *dw = cpu_to_le32(*dw);
 184                 dw++;
 185                 len -= 4;
 186         } while (len);
 187 #endif /* __BIG_ENDIAN */
 188 }
 189 #endif /* BEISCSI_H */