LXR linux/drivers/scsi/fnic/vnic

   1/*
   2 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   3 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4 *
   5 * This program is free software; you may redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; version 2 of the License.
   8 *
   9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16 * SOFTWARE.
  17 */
  18#ifndef _VNIC_CQ_H_
  19#define _VNIC_CQ_H_
  20
  21#include "cq_desc.h"
  22#include "vnic_dev.h"
  23
  24/*
  25 * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth
  26 * Driver) when both are built with CONFIG options =y
  27 */
  28#define vnic_cq_service fnic_cq_service
  29#define vnic_cq_free fnic_cq_free
  30#define vnic_cq_alloc fnic_cq_alloc
  31#define vnic_cq_init fnic_cq_init
  32#define vnic_cq_clean fnic_cq_clean
  33
  34/* Completion queue control */
  35struct vnic_cq_ctrl {
  36        u64 ring_base;                  /* 0x00 */
  37        u32 ring_size;                  /* 0x08 */
  38        u32 pad0;
  39        u32 flow_control_enable;        /* 0x10 */
  40        u32 pad1;
  41        u32 color_enable;               /* 0x18 */
  42        u32 pad2;
  43        u32 cq_head;                    /* 0x20 */
  44        u32 pad3;
  45        u32 cq_tail;                    /* 0x28 */
  46        u32 pad4;
  47        u32 cq_tail_color;              /* 0x30 */
  48        u32 pad5;
  49        u32 interrupt_enable;           /* 0x38 */
  50        u32 pad6;
  51        u32 cq_entry_enable;            /* 0x40 */
  52        u32 pad7;
  53        u32 cq_message_enable;          /* 0x48 */
  54        u32 pad8;
  55        u32 interrupt_offset;           /* 0x50 */
  56        u32 pad9;
  57        u64 cq_message_addr;            /* 0x58 */
  58        u32 pad10;
  59};
  60
  61struct vnic_cq {
  62        unsigned int index;
  63        struct vnic_dev *vdev;
  64        struct vnic_cq_ctrl __iomem *ctrl;      /* memory-mapped */
  65        struct vnic_dev_ring ring;
  66        unsigned int to_clean;
  67        unsigned int last_color;
  68};
  69
  70static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
  71        unsigned int work_to_do,
  72        int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
  73        u8 type, u16 q_number, u16 completed_index, void *opaque),
  74        void *opaque)
  75{
  76        struct cq_desc *cq_desc;
  77        unsigned int work_done = 0;
  78        u16 q_number, completed_index;
  79        u8 type, color;
  80
  81        cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  82                cq->ring.desc_size * cq->to_clean);
  83        cq_desc_dec(cq_desc, &type, &color,
  84                &q_number, &completed_index);
  85
  86        while (color != cq->last_color) {
  87
  88                if ((*q_service)(cq->vdev, cq_desc, type,
  89                        q_number, completed_index, opaque))
  90                        break;
  91
  92                cq->to_clean++;
  93                if (cq->to_clean == cq->ring.desc_count) {
  94                        cq->to_clean = 0;
  95                        cq->last_color = cq->last_color ? 0 : 1;
  96                }
  97
  98                cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  99                        cq->ring.desc_size * cq->to_clean);
 100                cq_desc_dec(cq_desc, &type, &color,
 101                        &q_number, &completed_index);
 102
 103                work_done++;
 104                if (work_done >= work_to_do)
 105                        break;
 106        }
 107
 108        return work_done;
 109}
 110
 111void vnic_cq_free(struct vnic_cq *cq);
 112int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
 113        unsigned int desc_count, unsigned int desc_size);
 114void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
 115        unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
 116        unsigned int cq_tail_color, unsigned int interrupt_enable,
 117        unsigned int cq_entry_enable, unsigned int message_enable,
 118        unsigned int interrupt_offset, u64 message_addr);
 119void vnic_cq_clean(struct vnic_cq *cq);
 120
 121#endif /* _VNIC_CQ_H_ */
 122