drivers/scsi/be2iscsi/be.h

   1 /*
   2  * Copyright 2017 Broadcom. All Rights Reserved.
   3  * The term "Broadcom" refers to Broadcom Limited and/or its subsidiaries.
   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@broadcom.com
  12  *
  13  */
  14
  15 #ifndef BEISCSI_H
  16 #define BEISCSI_H
  17
  18 #include <linux/pci.h>
  19 #include <linux/if_vlan.h>
  20 #include <linux/irq_poll.h>
  21 #define FW_VER_LEN      32
  22 #define MCC_Q_LEN       128
  23 #define MCC_CQ_LEN      256
  24 #define MAX_MCC_CMD     16
  25 /* BladeEngine Generation numbers */
  26 #define BE_GEN2 2
  27 #define BE_GEN3 3
  28 #define BE_GEN4 4
  29 struct be_dma_mem {
  30         void *va;
  31         dma_addr_t dma;
  32         u32 size;
  33 };
  34
  35 struct be_queue_info {
  36         struct be_dma_mem dma_mem;
  37         u16 len;
  38         u16 entry_size;         /* Size of an element in the queue */
  39         u16 id;
  40         u16 tail, head;
  41         bool created;
  42         u16 used;               /* Number of valid elements in the queue */
  43 };
  44
  45 static inline u32 MODULO(u16 val, u16 limit)
  46 {
  47         WARN_ON(limit & (limit - 1));
  48         return val & (limit - 1);
  49 }
  50
  51 static inline void index_inc(u16 *index, u16 limit)
  52 {
  53         *index = MODULO((*index + 1), limit);
  54 }
  55
  56 static inline void *queue_head_node(struct be_queue_info *q)
  57 {
  58         return q->dma_mem.va + q->head * q->entry_size;
  59 }
  60
  61 static inline void *queue_get_wrb(struct be_queue_info *q, unsigned int wrb_num)
  62 {
  63         return q->dma_mem.va + wrb_num * q->entry_size;
  64 }
  65
  66 static inline void *queue_tail_node(struct be_queue_info *q)
  67 {
  68         return q->dma_mem.va + q->tail * q->entry_size;
  69 }
  70
  71 static inline void queue_head_inc(struct be_queue_info *q)
  72 {
  73         index_inc(&q->head, q->len);
  74 }
  75
  76 static inline void queue_tail_inc(struct be_queue_info *q)
  77 {
  78         index_inc(&q->tail, q->len);
  79 }
  80
  81 /*ISCSI */
  82
  83 struct be_aic_obj {             /* Adaptive interrupt coalescing (AIC) info */
  84         unsigned long jiffies;
  85         u32 eq_prev;            /* Used to calculate eqe */
  86         u32 prev_eqd;
  87 #define BEISCSI_EQ_DELAY_MIN    0
  88 #define BEISCSI_EQ_DELAY_DEF    32
  89 #define BEISCSI_EQ_DELAY_MAX    128
  90 };
  91
  92 struct be_eq_obj {
  93         u32 cq_count;
  94         struct be_queue_info q;
  95         struct beiscsi_hba *phba;
  96         struct be_queue_info *cq;
  97         struct work_struct mcc_work; /* Work Item */
  98         struct irq_poll iopoll;
  99 };
 100
 101 struct be_mcc_obj {
 102         struct be_queue_info q;
 103         struct be_queue_info cq;
 104 };
 105
 106 struct beiscsi_mcc_tag_state {
 107         unsigned long tag_state;
 108 #define MCC_TAG_STATE_RUNNING   0
 109 #define MCC_TAG_STATE_TIMEOUT   1
 110 #define MCC_TAG_STATE_ASYNC     2
 111 #define MCC_TAG_STATE_IGNORE    3
 112         void (*cbfn)(struct beiscsi_hba *, unsigned int);
 113         struct be_dma_mem tag_mem_state;
 114 };
 115
 116 struct be_ctrl_info {
 117         u8 __iomem *csr;
 118         u8 __iomem *db;         /* Door Bell */
 119         u8 __iomem *pcicfg;     /* PCI config space */
 120         struct pci_dev *pdev;
 121
 122         /* Mbox used for cmd request/response */
 123         struct mutex mbox_lock; /* For serializing mbox cmds to BE card */
 124         struct be_dma_mem mbox_mem;
 125         /* Mbox mem is adjusted to align to 16 bytes. The allocated addr
 126          * is stored for freeing purpose */
 127         struct be_dma_mem mbox_mem_alloced;
 128
 129         /* MCC Rings */
 130         struct be_mcc_obj mcc_obj;
 131         spinlock_t mcc_lock;    /* For serializing mcc cmds to BE card */
 132
 133         wait_queue_head_t mcc_wait[MAX_MCC_CMD + 1];
 134         unsigned int mcc_tag[MAX_MCC_CMD];
 135         unsigned int mcc_tag_status[MAX_MCC_CMD + 1];
 136         unsigned short mcc_alloc_index;
 137         unsigned short mcc_free_index;
 138         unsigned int mcc_tag_available;
 139
 140         struct beiscsi_mcc_tag_state ptag_state[MAX_MCC_CMD + 1];
 141 };
 142
 143 #include "be_cmds.h"
 144
 145 /* WRB index mask for MCC_Q_LEN queue entries */
 146 #define MCC_Q_WRB_IDX_MASK      CQE_STATUS_WRB_MASK
 147 #define MCC_Q_WRB_IDX_SHIFT     CQE_STATUS_WRB_SHIFT
 148 /* TAG is from 1...MAX_MCC_CMD, MASK includes MAX_MCC_CMD */
 149 #define MCC_Q_CMD_TAG_MASK      ((MAX_MCC_CMD << 1) - 1)
 150
 151 #define PAGE_SHIFT_4K           12
 152 #define PAGE_SIZE_4K            (1 << PAGE_SHIFT_4K)
 153
 154 /* Returns number of pages spanned by the data starting at the given addr */
 155 #define PAGES_4K_SPANNED(_address, size)                                \
 156                 ((u32)((((size_t)(_address) & (PAGE_SIZE_4K - 1)) +     \
 157                         (size) + (PAGE_SIZE_4K - 1)) >> PAGE_SHIFT_4K))
 158
 159 /* Returns bit offset within a DWORD of a bitfield */
 160 #define AMAP_BIT_OFFSET(_struct, field)                                 \
 161                 (((size_t)&(((_struct *)0)->field))%32)
 162
 163 /* Returns the bit mask of the field that is NOT shifted into location. */
 164 static inline u32 amap_mask(u32 bitsize)
 165 {
 166         return (bitsize == 32 ? 0xFFFFFFFF : (1 << bitsize) - 1);
 167 }
 168
 169 static inline void amap_set(void *ptr, u32 dw_offset, u32 mask,
 170                                         u32 offset, u32 value)
 171 {
 172         u32 *dw = (u32 *) ptr + dw_offset;
 173         *dw &= ~(mask << offset);
 174         *dw |= (mask & value) << offset;
 175 }
 176
 177 #define AMAP_SET_BITS(_struct, field, ptr, val)                         \
 178                 amap_set(ptr,                                           \
 179                         offsetof(_struct, field)/32,                    \
 180                         amap_mask(sizeof(((_struct *)0)->field)),       \
 181                         AMAP_BIT_OFFSET(_struct, field),                \
 182                         val)
 183
 184 static inline u32 amap_get(void *ptr, u32 dw_offset, u32 mask, u32 offset)
 185 {
 186         u32 *dw = ptr;
 187         return mask & (*(dw + dw_offset) >> offset);
 188 }
 189
 190 #define AMAP_GET_BITS(_struct, field, ptr)                              \
 191                 amap_get(ptr,                                           \
 192                         offsetof(_struct, field)/32,                    \
 193                         amap_mask(sizeof(((_struct *)0)->field)),       \
 194                         AMAP_BIT_OFFSET(_struct, field))
 195
 196 #define be_dws_cpu_to_le(wrb, len) swap_dws(wrb, len)
 197 #define be_dws_le_to_cpu(wrb, len) swap_dws(wrb, len)
 198 static inline void swap_dws(void *wrb, int len)
 199 {
 200 #ifdef __BIG_ENDIAN
 201         u32 *dw = wrb;
 202         WARN_ON(len % 4);
 203         do {
 204                 *dw = cpu_to_le32(*dw);
 205                 dw++;
 206                 len -= 4;
 207         } while (len);
 208 #endif /* __BIG_ENDIAN */
 209 }
 210 #endif /* BEISCSI_H */