vnic_cq.h

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/*
 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#ifndef _VNIC_CQ_H_
#define _VNIC_CQ_H_

#include "cq_desc.h"
#include "vnic_dev.h"

/* Completion queue control */
struct vnic_cq_ctrl {
    u64 ring_base;          /* 0x00 */
    u32 ring_size;          /* 0x08 */
    u32 pad0;
    u32 flow_control_enable;    /* 0x10 */
    u32 pad1;
    u32 color_enable;       /* 0x18 */
    u32 pad2;
    u32 cq_head;            /* 0x20 */
    u32 pad3;
    u32 cq_tail;            /* 0x28 */
    u32 pad4;
    u32 cq_tail_color;      /* 0x30 */
    u32 pad5;
    u32 interrupt_enable;       /* 0x38 */
    u32 pad6;
    u32 cq_entry_enable;        /* 0x40 */
    u32 pad7;
    u32 cq_message_enable;      /* 0x48 */
    u32 pad8;
    u32 interrupt_offset;       /* 0x50 */
    u32 pad9;
    u64 cq_message_addr;        /* 0x58 */
    u32 pad10;
};

struct vnic_cq {
    unsigned int index;
    struct vnic_dev *vdev;
    struct vnic_cq_ctrl __iomem *ctrl;              /* memory-mapped */
    struct vnic_dev_ring ring;
    unsigned int to_clean;
    unsigned int last_color;
    unsigned int interrupt_offset;
};

static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
    unsigned int work_to_do,
    int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
    u8 type, u16 q_number, u16 completed_index, void *opaque),
    void *opaque)
{
    struct cq_desc *cq_desc;
    unsigned int work_done = 0;
    u16 q_number, completed_index;
    u8 type, color;

    cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
        cq->ring.desc_size * cq->to_clean);
    cq_desc_dec(cq_desc, &type, &color,
        &q_number, &completed_index);

    while (color != cq->last_color) {

        if ((*q_service)(cq->vdev, cq_desc, type,
            q_number, completed_index, opaque))
            break;

        cq->to_clean++;
        if (cq->to_clean == cq->ring.desc_count) {
            cq->to_clean = 0;
            cq->last_color = cq->last_color ? 0 : 1;
        }

        cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
            cq->ring.desc_size * cq->to_clean);
        cq_desc_dec(cq_desc, &type, &color,
            &q_number, &completed_index);

        work_done++;
        if (work_done >= work_to_do)
            break;
    }

    return work_done;
}

void vnic_cq_free(struct vnic_cq *cq);
int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
    unsigned int desc_count, unsigned int desc_size);
void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
    unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
    unsigned int cq_tail_color, unsigned int interrupt_enable,
    unsigned int cq_entry_enable, unsigned int message_enable,
    unsigned int interrupt_offset, u64 message_addr);
void vnic_cq_clean(struct vnic_cq *cq);

#endif /* _VNIC_CQ_H_ */