xref: /openbmc/linux/drivers/scsi/fnic/vnic_cq_copy.h (revision 293d5b43)
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_ */
63