drivers/scsi/be2iscsi/be.h

   1 /**
   2  * Copyright (C) 2005 - 2010 ServerEngines
   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@serverengines.com
  12  *
  13  * ServerEngines
  14  * 209 N. Fair Oaks Ave
  15  * Sunnyvale, CA 94085
  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
  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         struct be_queue_info q;
  88         struct beiscsi_hba *phba;
  89         struct be_queue_info *cq;
  90         struct blk_iopoll       iopoll;
  91 };
  92
  93 struct be_mcc_obj {
  94         struct be_queue_info q;
  95         struct be_queue_info cq;
  96 };
  97
  98 struct be_ctrl_info {
  99         u8 __iomem *csr;
 100         u8 __iomem *db;         /* Door Bell */
 101         u8 __iomem *pcicfg;     /* PCI config space */
 102         struct pci_dev *pdev;
 103
 104         /* Mbox used for cmd request/response */
 105         spinlock_t mbox_lock;   /* For serializing mbox cmds to BE card */
 106         struct be_dma_mem mbox_mem;
 107         /* Mbox mem is adjusted to align to 16 bytes. The allocated addr
 108          * is stored for freeing purpose */
 109         struct be_dma_mem mbox_mem_alloced;
 110
 111         /* MCC Rings */
 112         struct be_mcc_obj mcc_obj;
 113         spinlock_t mcc_lock;    /* For serializing mcc cmds to BE card */
 114         spinlock_t mcc_cq_lock;
 115
 116         wait_queue_head_t mcc_wait[MAX_MCC_CMD + 1];
 117         unsigned int mcc_tag[MAX_MCC_CMD];
 118         unsigned int mcc_numtag[MAX_MCC_CMD + 1];
 119         unsigned short mcc_alloc_index;
 120         unsigned short mcc_free_index;
 121         unsigned int mcc_tag_available;
 122 };
 123
 124 #include "be_cmds.h"
 125
 126 #define PAGE_SHIFT_4K 12
 127 #define PAGE_SIZE_4K (1 << PAGE_SHIFT_4K)
 128 #define mcc_timeout             120000 /* 5s timeout */
 129
 130 /* Returns number of pages spanned by the data starting at the given addr */
 131 #define PAGES_4K_SPANNED(_address, size)                                \
 132                 ((u32)((((size_t)(_address) & (PAGE_SIZE_4K - 1)) +     \
 133                         (size) + (PAGE_SIZE_4K - 1)) >> PAGE_SHIFT_4K))
 134
 135 /* Byte offset into the page corresponding to given address */
 136 #define OFFSET_IN_PAGE(addr)                                            \
 137                 ((size_t)(addr) & (PAGE_SIZE_4K-1))
 138
 139 /* Returns bit offset within a DWORD of a bitfield */
 140 #define AMAP_BIT_OFFSET(_struct, field)                                 \
 141                 (((size_t)&(((_struct *)0)->field))%32)
 142
 143 /* Returns the bit mask of the field that is NOT shifted into location. */
 144 static inline u32 amap_mask(u32 bitsize)
 145 {
 146         return (bitsize == 32 ? 0xFFFFFFFF : (1 << bitsize) - 1);
 147 }
 148
 149 static inline void amap_set(void *ptr, u32 dw_offset, u32 mask,
 150                                         u32 offset, u32 value)
 151 {
 152         u32 *dw = (u32 *) ptr + dw_offset;
 153         *dw &= ~(mask << offset);
 154         *dw |= (mask & value) << offset;
 155 }
 156
 157 #define AMAP_SET_BITS(_struct, field, ptr, val)                         \
 158                 amap_set(ptr,                                           \
 159                         offsetof(_struct, field)/32,                    \
 160                         amap_mask(sizeof(((_struct *)0)->field)),       \
 161                         AMAP_BIT_OFFSET(_struct, field),                \
 162                         val)
 163
 164 static inline u32 amap_get(void *ptr, u32 dw_offset, u32 mask, u32 offset)
 165 {
 166         u32 *dw = ptr;
 167         return mask & (*(dw + dw_offset) >> offset);
 168 }
 169
 170 #define AMAP_GET_BITS(_struct, field, ptr)                              \
 171                 amap_get(ptr,                                           \
 172                         offsetof(_struct, field)/32,                    \
 173                         amap_mask(sizeof(((_struct *)0)->field)),       \
 174                         AMAP_BIT_OFFSET(_struct, field))
 175
 176 #define be_dws_cpu_to_le(wrb, len) swap_dws(wrb, len)
 177 #define be_dws_le_to_cpu(wrb, len) swap_dws(wrb, len)
 178 static inline void swap_dws(void *wrb, int len)
 179 {
 180 #ifdef __BIG_ENDIAN
 181         u32 *dw = wrb;
 182         WARN_ON(len % 4);
 183         do {
 184                 *dw = cpu_to_le32(*dw);
 185                 dw++;
 186                 len -= 4;
 187         } while (len);
 188 #endif /* __BIG_ENDIAN */
 189 }
 190 #endif /* BEISCSI_H */