LXR linux/drivers/scsi/snic/vnic_cq

   1/*
   2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3 *
   4 * This program is free software; you may redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; version 2 of the License.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15 * SOFTWARE.
  16 */
  17
  18#ifndef _VNIC_CQ_FW_H_
  19#define _VNIC_CQ_FW_H_
  20
  21#include "snic_fwint.h"
  22
  23static inline unsigned int
  24vnic_cq_fw_service(struct vnic_cq *cq,
  25                   int (*q_service)(struct vnic_dev *vdev,
  26                                    unsigned int index,
  27                                    struct snic_fw_req *desc),
  28                   unsigned int work_to_do)
  29
  30{
  31        struct snic_fw_req *desc;
  32        unsigned int work_done = 0;
  33        u8 color;
  34
  35        desc = (struct snic_fw_req *)((u8 *)cq->ring.descs +
  36                cq->ring.desc_size * cq->to_clean);
  37        snic_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 snic_fw_req *)((u8 *)cq->ring.descs +
  51                        cq->ring.desc_size * cq->to_clean);
  52                snic_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_FW_H_ */
  63