LXR linux/drivers/scsi/snic/vnic

   1/*
   2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3 *
   4 * This program is free software; you may redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; version 2 of the License.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15 * SOFTWARE.
  16 */
  17
  18#ifndef _VNIC_CQ_H_
  19#define _VNIC_CQ_H_
  20
  21#include "cq_desc.h"
  22#include "vnic_dev.h"
  23
  24/* Completion queue control */
  25struct vnic_cq_ctrl {
  26        u64 ring_base;                  /* 0x00 */
  27        u32 ring_size;                  /* 0x08 */
  28        u32 pad0;
  29        u32 flow_control_enable;        /* 0x10 */
  30        u32 pad1;
  31        u32 color_enable;               /* 0x18 */
  32        u32 pad2;
  33        u32 cq_head;                    /* 0x20 */
  34        u32 pad3;
  35        u32 cq_tail;                    /* 0x28 */
  36        u32 pad4;
  37        u32 cq_tail_color;              /* 0x30 */
  38        u32 pad5;
  39        u32 interrupt_enable;           /* 0x38 */
  40        u32 pad6;
  41        u32 cq_entry_enable;            /* 0x40 */
  42        u32 pad7;
  43        u32 cq_message_enable;          /* 0x48 */
  44        u32 pad8;
  45        u32 interrupt_offset;           /* 0x50 */
  46        u32 pad9;
  47        u64 cq_message_addr;            /* 0x58 */
  48        u32 pad10;
  49};
  50
  51struct vnic_cq {
  52        unsigned int index;
  53        struct vnic_dev *vdev;
  54        struct vnic_cq_ctrl __iomem *ctrl;      /* memory-mapped */
  55        struct vnic_dev_ring ring;
  56        unsigned int to_clean;
  57        unsigned int last_color;
  58};
  59
  60static inline unsigned int svnic_cq_service(struct vnic_cq *cq,
  61        unsigned int work_to_do,
  62        int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
  63        u8 type, u16 q_number, u16 completed_index, void *opaque),
  64        void *opaque)
  65{
  66        struct cq_desc *cq_desc;
  67        unsigned int work_done = 0;
  68        u16 q_number, completed_index;
  69        u8 type, color;
  70
  71        cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  72                cq->ring.desc_size * cq->to_clean);
  73        cq_desc_dec(cq_desc, &type, &color,
  74                &q_number, &completed_index);
  75
  76        while (color != cq->last_color) {
  77
  78                if ((*q_service)(cq->vdev, cq_desc, type,
  79                        q_number, completed_index, opaque))
  80                        break;
  81
  82                cq->to_clean++;
  83                if (cq->to_clean == cq->ring.desc_count) {
  84                        cq->to_clean = 0;
  85                        cq->last_color = cq->last_color ? 0 : 1;
  86                }
  87
  88                cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  89                        cq->ring.desc_size * cq->to_clean);
  90                cq_desc_dec(cq_desc, &type, &color,
  91                        &q_number, &completed_index);
  92
  93                work_done++;
  94                if (work_done >= work_to_do)
  95                        break;
  96        }
  97
  98        return work_done;
  99}
 100
 101void svnic_cq_free(struct vnic_cq *cq);
 102int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
 103        unsigned int index, unsigned int desc_count, unsigned int desc_size);
 104void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
 105        unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
 106        unsigned int cq_tail_color, unsigned int interrupt_enable,
 107        unsigned int cq_entry_enable, unsigned int message_enable,
 108        unsigned int interrupt_offset, u64 message_addr);
 109void svnic_cq_clean(struct vnic_cq *cq);
 110#endif /* _VNIC_CQ_H_ */
 111