/*
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* Copyright 2008 Cisco Systems, Inc. All rights reserved.
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* Copyright 2007 Nuova Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _VNIC_WQ_COPY_H_
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#define _VNIC_WQ_COPY_H_
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#include <linux/pci.h>
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#include "vnic_wq.h"
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#include "fcpio.h"
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#define VNIC_WQ_COPY_MAX 1
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struct vnic_wq_copy {
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unsigned int index;
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struct vnic_dev *vdev;
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struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */
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struct vnic_dev_ring ring;
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unsigned to_use_index;
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unsigned to_clean_index;
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};
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static inline unsigned int vnic_wq_copy_desc_avail(struct vnic_wq_copy *wq)
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{
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return wq->ring.desc_avail;
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}
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static inline unsigned int vnic_wq_copy_desc_in_use(struct vnic_wq_copy *wq)
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{
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return wq->ring.desc_count - 1 - wq->ring.desc_avail;
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}
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static inline void *vnic_wq_copy_next_desc(struct vnic_wq_copy *wq)
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{
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struct fcpio_host_req *desc = wq->ring.descs;
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return &desc[wq->to_use_index];
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}
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static inline void vnic_wq_copy_post(struct vnic_wq_copy *wq)
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{
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((wq->to_use_index + 1) == wq->ring.desc_count) ?
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(wq->to_use_index = 0) : (wq->to_use_index++);
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wq->ring.desc_avail--;
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/* Adding write memory barrier prevents compiler and/or CPU
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* reordering, thus avoiding descriptor posting before
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* descriptor is initialized. Otherwise, hardware can read
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* stale descriptor fields.
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*/
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wmb();
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iowrite32(wq->to_use_index, &wq->ctrl->posted_index);
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}
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static inline void vnic_wq_copy_desc_process(struct vnic_wq_copy *wq, u16 index)
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{
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unsigned int cnt;
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if (wq->to_clean_index <= index)
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cnt = (index - wq->to_clean_index) + 1;
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else
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cnt = wq->ring.desc_count - wq->to_clean_index + index + 1;
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wq->to_clean_index = ((index + 1) % wq->ring.desc_count);
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wq->ring.desc_avail += cnt;
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}
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static inline void vnic_wq_copy_service(struct vnic_wq_copy *wq,
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u16 completed_index,
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void (*q_service)(struct vnic_wq_copy *wq,
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struct fcpio_host_req *wq_desc))
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{
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struct fcpio_host_req *wq_desc = wq->ring.descs;
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unsigned int curr_index;
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while (1) {
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if (q_service)
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(*q_service)(wq, &wq_desc[wq->to_clean_index]);
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wq->ring.desc_avail++;
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curr_index = wq->to_clean_index;
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/* increment the to-clean index so that we start
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* with an unprocessed index next time we enter the loop
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*/
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((wq->to_clean_index + 1) == wq->ring.desc_count) ?
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(wq->to_clean_index = 0) : (wq->to_clean_index++);
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if (curr_index == completed_index)
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break;
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/* we have cleaned all the entries */
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if ((completed_index == (u16)-1) &&
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(wq->to_clean_index == wq->to_use_index))
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break;
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}
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}
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void vnic_wq_copy_enable(struct vnic_wq_copy *wq);
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int vnic_wq_copy_disable(struct vnic_wq_copy *wq);
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void vnic_wq_copy_free(struct vnic_wq_copy *wq);
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int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
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unsigned int index, unsigned int desc_count, unsigned int desc_size);
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void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
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unsigned int error_interrupt_enable,
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unsigned int error_interrupt_offset);
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void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
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void (*q_clean)(struct vnic_wq_copy *wq,
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struct fcpio_host_req *wq_desc));
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#endif /* _VNIC_WQ_COPY_H_ */
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