drivers/scsi/fnic/vnic_cq.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   5  */
   6 #ifndef _VNIC_CQ_H_
   7 #define _VNIC_CQ_H_
   8
   9 #include "cq_desc.h"
  10 #include "vnic_dev.h"
  11
  12 /*
  13  * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth
  14  * Driver) when both are built with CONFIG options =y
  15  */
  16 #define vnic_cq_service fnic_cq_service
  17 #define vnic_cq_free fnic_cq_free
  18 #define vnic_cq_alloc fnic_cq_alloc
  19 #define vnic_cq_init fnic_cq_init
  20 #define vnic_cq_clean fnic_cq_clean
  21
  22 /* Completion queue control */
  23 struct vnic_cq_ctrl {
  24         u64 ring_base;                  /* 0x00 */
  25         u32 ring_size;                  /* 0x08 */
  26         u32 pad0;
  27         u32 flow_control_enable;        /* 0x10 */
  28         u32 pad1;
  29         u32 color_enable;               /* 0x18 */
  30         u32 pad2;
  31         u32 cq_head;                    /* 0x20 */
  32         u32 pad3;
  33         u32 cq_tail;                    /* 0x28 */
  34         u32 pad4;
  35         u32 cq_tail_color;              /* 0x30 */
  36         u32 pad5;
  37         u32 interrupt_enable;           /* 0x38 */
  38         u32 pad6;
  39         u32 cq_entry_enable;            /* 0x40 */
  40         u32 pad7;
  41         u32 cq_message_enable;          /* 0x48 */
  42         u32 pad8;
  43         u32 interrupt_offset;           /* 0x50 */
  44         u32 pad9;
  45         u64 cq_message_addr;            /* 0x58 */
  46         u32 pad10;
  47 };
  48
  49 struct vnic_cq {
  50         unsigned int index;
  51         struct vnic_dev *vdev;
  52         struct vnic_cq_ctrl __iomem *ctrl;      /* memory-mapped */
  53         struct vnic_dev_ring ring;
  54         unsigned int to_clean;
  55         unsigned int last_color;
  56 };
  57
  58 static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
  59         unsigned int work_to_do,
  60         int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
  61         u8 type, u16 q_number, u16 completed_index, void *opaque),
  62         void *opaque)
  63 {
  64         struct cq_desc *cq_desc;
  65         unsigned int work_done = 0;
  66         u16 q_number, completed_index;
  67         u8 type, color;
  68
  69         cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  70                 cq->ring.desc_size * cq->to_clean);
  71         cq_desc_dec(cq_desc, &type, &color,
  72                 &q_number, &completed_index);
  73
  74         while (color != cq->last_color) {
  75
  76                 if ((*q_service)(cq->vdev, cq_desc, type,
  77                         q_number, completed_index, opaque))
  78                         break;
  79
  80                 cq->to_clean++;
  81                 if (cq->to_clean == cq->ring.desc_count) {
  82                         cq->to_clean = 0;
  83                         cq->last_color = cq->last_color ? 0 : 1;
  84                 }
  85
  86                 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  87                         cq->ring.desc_size * cq->to_clean);
  88                 cq_desc_dec(cq_desc, &type, &color,
  89                         &q_number, &completed_index);
  90
  91                 work_done++;
  92                 if (work_done >= work_to_do)
  93                         break;
  94         }
  95
  96         return work_done;
  97 }
  98
  99 void vnic_cq_free(struct vnic_cq *cq);
 100 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
 101         unsigned int desc_count, unsigned int desc_size);
 102 void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
 103         unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
 104         unsigned int cq_tail_color, unsigned int interrupt_enable,
 105         unsigned int cq_entry_enable, unsigned int message_enable,
 106         unsigned int interrupt_offset, u64 message_addr);
 107 void vnic_cq_clean(struct vnic_cq *cq);
 108
 109 #endif /* _VNIC_CQ_H_ */