/*
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* Copyright 2014 Cisco 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_CQ_H_
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#define _VNIC_CQ_H_
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#include "cq_desc.h"
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#include "vnic_dev.h"
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/* Completion queue control */
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struct vnic_cq_ctrl {
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u64 ring_base; /* 0x00 */
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u32 ring_size; /* 0x08 */
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u32 pad0;
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u32 flow_control_enable; /* 0x10 */
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u32 pad1;
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u32 color_enable; /* 0x18 */
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u32 pad2;
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u32 cq_head; /* 0x20 */
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u32 pad3;
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u32 cq_tail; /* 0x28 */
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u32 pad4;
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u32 cq_tail_color; /* 0x30 */
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u32 pad5;
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u32 interrupt_enable; /* 0x38 */
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u32 pad6;
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u32 cq_entry_enable; /* 0x40 */
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u32 pad7;
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u32 cq_message_enable; /* 0x48 */
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u32 pad8;
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u32 interrupt_offset; /* 0x50 */
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u32 pad9;
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u64 cq_message_addr; /* 0x58 */
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u32 pad10;
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};
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struct vnic_cq {
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unsigned int index;
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struct vnic_dev *vdev;
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struct vnic_cq_ctrl __iomem *ctrl; /* memory-mapped */
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struct vnic_dev_ring ring;
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unsigned int to_clean;
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unsigned int last_color;
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};
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static inline unsigned int svnic_cq_service(struct vnic_cq *cq,
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unsigned int work_to_do,
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int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
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u8 type, u16 q_number, u16 completed_index, void *opaque),
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void *opaque)
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{
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struct cq_desc *cq_desc;
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unsigned int work_done = 0;
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u16 q_number, completed_index;
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u8 type, color;
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cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
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cq->ring.desc_size * cq->to_clean);
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cq_desc_dec(cq_desc, &type, &color,
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&q_number, &completed_index);
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while (color != cq->last_color) {
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if ((*q_service)(cq->vdev, cq_desc, type,
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q_number, completed_index, opaque))
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break;
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cq->to_clean++;
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if (cq->to_clean == cq->ring.desc_count) {
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cq->to_clean = 0;
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cq->last_color = cq->last_color ? 0 : 1;
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}
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cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
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cq->ring.desc_size * cq->to_clean);
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cq_desc_dec(cq_desc, &type, &color,
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&q_number, &completed_index);
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work_done++;
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if (work_done >= work_to_do)
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break;
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}
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return work_done;
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}
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void svnic_cq_free(struct vnic_cq *cq);
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int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
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unsigned int index, unsigned int desc_count, unsigned int desc_size);
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void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
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unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
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unsigned int cq_tail_color, unsigned int interrupt_enable,
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unsigned int cq_entry_enable, unsigned int message_enable,
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unsigned int interrupt_offset, u64 message_addr);
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void svnic_cq_clean(struct vnic_cq *cq);
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#endif /* _VNIC_CQ_H_ */
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