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128 lines
3.7 KiB
128 lines
3.7 KiB
/* |
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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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