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vnic_cq_copy.h
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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_COPY_H_
19 #define _VNIC_CQ_COPY_H_
20 
21 #include "fcpio.h"
22 
23 static inline unsigned int vnic_cq_copy_service(
24  struct vnic_cq *cq,
25  int (*q_service)(struct vnic_dev *vdev,
26  unsigned int index,
27  struct fcpio_fw_req *desc),
28  unsigned int work_to_do)
29 
30 {
31  struct fcpio_fw_req *desc;
32  unsigned int work_done = 0;
33  u8 color;
34 
35  desc = (struct fcpio_fw_req *)((u8 *)cq->ring.descs +
36  cq->ring.desc_size * cq->to_clean);
37  fcpio_color_dec(desc, &color);
38 
39  while (color != cq->last_color) {
40 
41  if ((*q_service)(cq->vdev, cq->index, desc))
42  break;
43 
44  cq->to_clean++;
45  if (cq->to_clean == cq->ring.desc_count) {
46  cq->to_clean = 0;
47  cq->last_color = cq->last_color ? 0 : 1;
48  }
49 
50  desc = (struct fcpio_fw_req *)((u8 *)cq->ring.descs +
51  cq->ring.desc_size * cq->to_clean);
52  fcpio_color_dec(desc, &color);
53 
54  work_done++;
55  if (work_done >= work_to_do)
56  break;
57  }
58 
59  return work_done;
60 }
61 
62 #endif /* _VNIC_CQ_COPY_H_ */