LXR linux/drivers/net/ethernet/cisco/enic/vnic

   1/*
   2 * Copyright 2008-2010 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 */
  19
  20#ifndef _VNIC_CQ_H_
  21#define _VNIC_CQ_H_
  22
  23#include "cq_desc.h"
  24#include "vnic_dev.h"
  25
  26/* Completion queue control */
  27struct vnic_cq_ctrl {
  28        u64 ring_base;                  /* 0x00 */
  29        u32 ring_size;                  /* 0x08 */
  30        u32 pad0;
  31        u32 flow_control_enable;        /* 0x10 */
  32        u32 pad1;
  33        u32 color_enable;               /* 0x18 */
  34        u32 pad2;
  35        u32 cq_head;                    /* 0x20 */
  36        u32 pad3;
  37        u32 cq_tail;                    /* 0x28 */
  38        u32 pad4;
  39        u32 cq_tail_color;              /* 0x30 */
  40        u32 pad5;
  41        u32 interrupt_enable;           /* 0x38 */
  42        u32 pad6;
  43        u32 cq_entry_enable;            /* 0x40 */
  44        u32 pad7;
  45        u32 cq_message_enable;          /* 0x48 */
  46        u32 pad8;
  47        u32 interrupt_offset;           /* 0x50 */
  48        u32 pad9;
  49        u64 cq_message_addr;            /* 0x58 */
  50        u32 pad10;
  51};
  52
  53struct vnic_cq {
  54        unsigned int index;
  55        struct vnic_dev *vdev;
  56        struct vnic_cq_ctrl __iomem *ctrl;              /* memory-mapped */
  57        struct vnic_dev_ring ring;
  58        unsigned int to_clean;
  59        unsigned int last_color;
  60        unsigned int interrupt_offset;
  61};
  62
  63static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
  64        unsigned int work_to_do,
  65        int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
  66        u8 type, u16 q_number, u16 completed_index, void *opaque),
  67        void *opaque)
  68{
  69        struct cq_desc *cq_desc;
  70        unsigned int work_done = 0;
  71        u16 q_number, completed_index;
  72        u8 type, color;
  73
  74        cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  75                cq->ring.desc_size * cq->to_clean);
  76        cq_desc_dec(cq_desc, &type, &color,
  77                &q_number, &completed_index);
  78
  79        while (color != cq->last_color) {
  80
  81                if ((*q_service)(cq->vdev, cq_desc, type,
  82                        q_number, completed_index, opaque))
  83                        break;
  84
  85                cq->to_clean++;
  86                if (cq->to_clean == cq->ring.desc_count) {
  87                        cq->to_clean = 0;
  88                        cq->last_color = cq->last_color ? 0 : 1;
  89                }
  90
  91                cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  92                        cq->ring.desc_size * cq->to_clean);
  93                cq_desc_dec(cq_desc, &type, &color,
  94                        &q_number, &completed_index);
  95
  96                work_done++;
  97                if (work_done >= work_to_do)
  98                        break;
  99        }
 100
 101        return work_done;
 102}
 103
 104void vnic_cq_free(struct vnic_cq *cq);
 105int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
 106        unsigned int desc_count, unsigned int desc_size);
 107void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
 108        unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
 109        unsigned int cq_tail_color, unsigned int interrupt_enable,
 110        unsigned int cq_entry_enable, unsigned int message_enable,
 111        unsigned int interrupt_offset, u64 message_addr);
 112void vnic_cq_clean(struct vnic_cq *cq);
 113
 114#endif /* _VNIC_CQ_H_ */
 115