be.h

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#ifndef BEISCSI_H
#define BEISCSI_H

#include <linux/pci.h>
#include <linux/if_vlan.h>
#include <linux/blk-iopoll.h>
#define FW_VER_LEN  32
#define MCC_Q_LEN   128
#define MCC_CQ_LEN  256
#define MAX_MCC_CMD 16
/* BladeEngine Generation numbers */
#define BE_GEN2 2
#define BE_GEN3 3

struct be_dma_mem {
    void *va;
    dma_addr_t dma;
    u32 size;
};

struct be_queue_info {
    struct be_dma_mem dma_mem;
    u16 len;
    u16 entry_size;     /* Size of an element in the queue */
    u16 id;
    u16 tail, head;
    bool created;
    atomic_t used;      /* Number of valid elements in the queue */
};

static inline u32 MODULO(u16 val, u16 limit)
{
    WARN_ON(limit & (limit - 1));
    return val & (limit - 1);
}

static inline void index_inc(u16 *index, u16 limit)
{
    *index = MODULO((*index + 1), limit);
}

static inline void *queue_head_node(struct be_queue_info *q)
{
    return q->dma_mem.va + q->head * q->entry_size;
}

static inline void *queue_get_wrb(struct be_queue_info *q, unsigned int wrb_num)
{
    return q->dma_mem.va + wrb_num * q->entry_size;
}

static inline void *queue_tail_node(struct be_queue_info *q)
{
    return q->dma_mem.va + q->tail * q->entry_size;
}

static inline void queue_head_inc(struct be_queue_info *q)
{
    index_inc(&q->head, q->len);
}

static inline void queue_tail_inc(struct be_queue_info *q)
{
    index_inc(&q->tail, q->len);
}

/*ISCSI */

struct be_eq_obj {
    struct be_queue_info q;
    struct beiscsi_hba *phba;
    struct be_queue_info *cq;
    struct blk_iopoll   iopoll;
};

struct be_mcc_obj {
    struct be_queue_info q;
    struct be_queue_info cq;
};

struct be_ctrl_info {
    u8 __iomem *csr;
    u8 __iomem *db;     /* Door Bell */
    u8 __iomem *pcicfg; /* PCI config space */
    struct pci_dev *pdev;

    /* Mbox used for cmd request/response */
    spinlock_t mbox_lock;   /* For serializing mbox cmds to BE card */
    struct be_dma_mem mbox_mem;
    /* Mbox mem is adjusted to align to 16 bytes. The allocated addr
     * is stored for freeing purpose */
    struct be_dma_mem mbox_mem_alloced;

    /* MCC Rings */
    struct be_mcc_obj mcc_obj;
    spinlock_t mcc_lock;    /* For serializing mcc cmds to BE card */
    spinlock_t mcc_cq_lock;

    wait_queue_head_t mcc_wait[MAX_MCC_CMD + 1];
    unsigned int mcc_tag[MAX_MCC_CMD];
    unsigned int mcc_numtag[MAX_MCC_CMD + 1];
    unsigned short mcc_alloc_index;
    unsigned short mcc_free_index;
    unsigned int mcc_tag_available;
};

#include "be_cmds.h"

#define PAGE_SHIFT_4K 12
#define PAGE_SIZE_4K (1 << PAGE_SHIFT_4K)
#define mcc_timeout     120000 /* 5s timeout */

/* Returns number of pages spanned by the data starting at the given addr */
#define PAGES_4K_SPANNED(_address, size)                \
        ((u32)((((size_t)(_address) & (PAGE_SIZE_4K - 1)) + \
            (size) + (PAGE_SIZE_4K - 1)) >> PAGE_SHIFT_4K))

/* Returns bit offset within a DWORD of a bitfield */
#define AMAP_BIT_OFFSET(_struct, field)                 \
        (((size_t)&(((_struct *)0)->field))%32)

/* Returns the bit mask of the field that is NOT shifted into location. */
static inline u32 amap_mask(u32 bitsize)
{
    return (bitsize == 32 ? 0xFFFFFFFF : (1 << bitsize) - 1);
}

static inline void amap_set(void *ptr, u32 dw_offset, u32 mask,
                    u32 offset, u32 value)
{
    u32 *dw = (u32 *) ptr + dw_offset;
    *dw &= ~(mask << offset);
    *dw |= (mask & value) << offset;
}

#define AMAP_SET_BITS(_struct, field, ptr, val)             \
        amap_set(ptr,                       \
            offsetof(_struct, field)/32,            \
            amap_mask(sizeof(((_struct *)0)->field)),   \
            AMAP_BIT_OFFSET(_struct, field),        \
            val)

static inline u32 amap_get(void *ptr, u32 dw_offset, u32 mask, u32 offset)
{
    u32 *dw = ptr;
    return mask & (*(dw + dw_offset) >> offset);
}

#define AMAP_GET_BITS(_struct, field, ptr)              \
        amap_get(ptr,                       \
            offsetof(_struct, field)/32,            \
            amap_mask(sizeof(((_struct *)0)->field)),   \
            AMAP_BIT_OFFSET(_struct, field))

#define be_dws_cpu_to_le(wrb, len) swap_dws(wrb, len)
#define be_dws_le_to_cpu(wrb, len) swap_dws(wrb, len)
static inline void swap_dws(void *wrb, int len)
{
#ifdef __BIG_ENDIAN
    u32 *dw = wrb;
    WARN_ON(len % 4);
    do {
        *dw = cpu_to_le32(*dw);
        dw++;
        len -= 4;
    } while (len);
#endif /* __BIG_ENDIAN */
}
#endif /* BEISCSI_H */