drivers/scsi/be2iscsi/be.h

   1 /**
   2  * Copyright (C) 2005 - 2014 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_aic_obj {             /* Adaptive interrupt coalescing (AIC) info */
  87         bool enable;
  88         u32 min_eqd;            /* in usecs */
  89         u32 max_eqd;            /* in usecs */
  90         u32 prev_eqd;           /* in usecs */
  91         u32 et_eqd;             /* configured val when aic is off */
  92         ulong jiffs;
  93         u64 eq_prev;            /* Used to calculate eqe */
  94 };
  95
  96 struct be_eq_obj {
  97         bool todo_mcc_cq;
  98         bool todo_cq;
  99         u32 cq_count;
 100         struct be_queue_info q;
 101         struct beiscsi_hba *phba;
 102         struct be_queue_info *cq;
 103         struct work_struct work_cqs; /* Work Item */
 104         struct blk_iopoll       iopoll;
 105 };
 106
 107 struct be_mcc_obj {
 108         struct be_queue_info q;
 109         struct be_queue_info cq;
 110 };
 111
 112 struct beiscsi_mcc_tag_state {
 113 #define MCC_TAG_STATE_COMPLETED 0x00
 114 #define MCC_TAG_STATE_RUNNING   0x01
 115 #define MCC_TAG_STATE_TIMEOUT   0x02
 116         uint8_t tag_state;
 117         struct be_dma_mem tag_mem_state;
 118 };
 119
 120 struct be_ctrl_info {
 121         u8 __iomem *csr;
 122         u8 __iomem *db;         /* Door Bell */
 123         u8 __iomem *pcicfg;     /* PCI config space */
 124         struct pci_dev *pdev;
 125
 126         /* Mbox used for cmd request/response */
 127         spinlock_t mbox_lock;   /* For serializing mbox cmds to BE card */
 128         struct be_dma_mem mbox_mem;
 129         /* Mbox mem is adjusted to align to 16 bytes. The allocated addr
 130          * is stored for freeing purpose */
 131         struct be_dma_mem mbox_mem_alloced;
 132
 133         /* MCC Rings */
 134         struct be_mcc_obj mcc_obj;
 135         spinlock_t mcc_lock;    /* For serializing mcc cmds to BE card */
 136         spinlock_t mcc_cq_lock;
 137
 138         wait_queue_head_t mcc_wait[MAX_MCC_CMD + 1];
 139         unsigned int mcc_tag[MAX_MCC_CMD];
 140         unsigned int mcc_numtag[MAX_MCC_CMD + 1];
 141         unsigned short mcc_alloc_index;
 142         unsigned short mcc_free_index;
 143         unsigned int mcc_tag_available;
 144
 145         struct beiscsi_mcc_tag_state ptag_state[MAX_MCC_CMD + 1];
 146 };
 147
 148 #include "be_cmds.h"
 149
 150 #define PAGE_SHIFT_4K 12
 151 #define PAGE_SIZE_4K (1 << PAGE_SHIFT_4K)
 152 #define mcc_timeout             120000 /* 12s timeout */
 153 #define BEISCSI_LOGOUT_SYNC_DELAY       250
 154
 155 /* Returns number of pages spanned by the data starting at the given addr */
 156 #define PAGES_4K_SPANNED(_address, size)                                \
 157                 ((u32)((((size_t)(_address) & (PAGE_SIZE_4K - 1)) +     \
 158                         (size) + (PAGE_SIZE_4K - 1)) >> PAGE_SHIFT_4K))
 159
 160 /* Returns bit offset within a DWORD of a bitfield */
 161 #define AMAP_BIT_OFFSET(_struct, field)                                 \
 162                 (((size_t)&(((_struct *)0)->field))%32)
 163
 164 /* Returns the bit mask of the field that is NOT shifted into location. */
 165 static inline u32 amap_mask(u32 bitsize)
 166 {
 167         return (bitsize == 32 ? 0xFFFFFFFF : (1 << bitsize) - 1);
 168 }
 169
 170 static inline void amap_set(void *ptr, u32 dw_offset, u32 mask,
 171                                         u32 offset, u32 value)
 172 {
 173         u32 *dw = (u32 *) ptr + dw_offset;
 174         *dw &= ~(mask << offset);
 175         *dw |= (mask & value) << offset;
 176 }
 177
 178 #define AMAP_SET_BITS(_struct, field, ptr, val)                         \
 179                 amap_set(ptr,                                           \
 180                         offsetof(_struct, field)/32,                    \
 181                         amap_mask(sizeof(((_struct *)0)->field)),       \
 182                         AMAP_BIT_OFFSET(_struct, field),                \
 183                         val)
 184
 185 static inline u32 amap_get(void *ptr, u32 dw_offset, u32 mask, u32 offset)
 186 {
 187         u32 *dw = ptr;
 188         return mask & (*(dw + dw_offset) >> offset);
 189 }
 190
 191 #define AMAP_GET_BITS(_struct, field, ptr)                              \
 192                 amap_get(ptr,                                           \
 193                         offsetof(_struct, field)/32,                    \
 194                         amap_mask(sizeof(((_struct *)0)->field)),       \
 195                         AMAP_BIT_OFFSET(_struct, field))
 196
 197 #define be_dws_cpu_to_le(wrb, len) swap_dws(wrb, len)
 198 #define be_dws_le_to_cpu(wrb, len) swap_dws(wrb, len)
 199 static inline void swap_dws(void *wrb, int len)
 200 {
 201 #ifdef __BIG_ENDIAN
 202         u32 *dw = wrb;
 203         WARN_ON(len % 4);
 204         do {
 205                 *dw = cpu_to_le32(*dw);
 206                 dw++;
 207                 len -= 4;
 208         } while (len);
 209 #endif /* __BIG_ENDIAN */
 210 }
 211 #endif /* BEISCSI_H */