drivers/net/enic/vnic_cq.h

   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 */
  27 struct 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
  53 struct 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
  63 static 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
 104 void vnic_cq_free(struct vnic_cq *cq);
 105 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
 106         unsigned int desc_count, unsigned int desc_size);
 107 void 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);
 112 void vnic_cq_clean(struct vnic_cq *cq);
 113
 114 #endif /* _VNIC_CQ_H_ */