mirror of https://gitee.com/openkylin/linux.git
195 lines
4.7 KiB
C
195 lines
4.7 KiB
C
/*
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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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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include "vnic_dev.h"
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#include "vnic_rq.h"
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static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
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{
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struct vnic_rq_buf *buf;
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unsigned int i, j, count = rq->ring.desc_count;
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unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
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for (i = 0; i < blks; i++) {
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rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC);
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if (!rq->bufs[i]) {
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printk(KERN_ERR "Failed to alloc rq_bufs\n");
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return -ENOMEM;
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}
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}
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for (i = 0; i < blks; i++) {
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buf = rq->bufs[i];
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for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) {
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buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j;
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buf->desc = (u8 *)rq->ring.descs +
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rq->ring.desc_size * buf->index;
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if (buf->index + 1 == count) {
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buf->next = rq->bufs[0];
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break;
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} else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) {
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buf->next = rq->bufs[i + 1];
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} else {
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buf->next = buf + 1;
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buf++;
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}
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}
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}
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rq->to_use = rq->to_clean = rq->bufs[0];
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rq->buf_index = 0;
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return 0;
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}
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void vnic_rq_free(struct vnic_rq *rq)
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{
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struct vnic_dev *vdev;
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unsigned int i;
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vdev = rq->vdev;
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vnic_dev_free_desc_ring(vdev, &rq->ring);
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for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
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kfree(rq->bufs[i]);
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rq->bufs[i] = NULL;
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}
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rq->ctrl = NULL;
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}
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int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
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unsigned int desc_count, unsigned int desc_size)
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{
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int err;
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rq->index = index;
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rq->vdev = vdev;
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rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
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if (!rq->ctrl) {
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printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index);
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return -EINVAL;
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}
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vnic_rq_disable(rq);
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err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
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if (err)
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return err;
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err = vnic_rq_alloc_bufs(rq);
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if (err) {
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vnic_rq_free(rq);
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return err;
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}
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return 0;
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}
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void vnic_rq_init(struct vnic_rq *rq, 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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{
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u64 paddr;
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u32 fetch_index;
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paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
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writeq(paddr, &rq->ctrl->ring_base);
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iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size);
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iowrite32(cq_index, &rq->ctrl->cq_index);
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iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
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iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
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iowrite32(0, &rq->ctrl->dropped_packet_count);
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iowrite32(0, &rq->ctrl->error_status);
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/* Use current fetch_index as the ring starting point */
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fetch_index = ioread32(&rq->ctrl->fetch_index);
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rq->to_use = rq->to_clean =
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&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
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[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
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iowrite32(fetch_index, &rq->ctrl->posted_index);
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rq->buf_index = 0;
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}
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unsigned int vnic_rq_error_status(struct vnic_rq *rq)
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{
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return ioread32(&rq->ctrl->error_status);
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}
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void vnic_rq_enable(struct vnic_rq *rq)
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{
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iowrite32(1, &rq->ctrl->enable);
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}
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int vnic_rq_disable(struct vnic_rq *rq)
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{
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unsigned int wait;
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iowrite32(0, &rq->ctrl->enable);
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/* Wait for HW to ACK disable request */
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for (wait = 0; wait < 100; wait++) {
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if (!(ioread32(&rq->ctrl->running)))
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return 0;
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udelay(1);
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}
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printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
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return -ETIMEDOUT;
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}
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void vnic_rq_clean(struct vnic_rq *rq,
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void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
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{
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struct vnic_rq_buf *buf;
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u32 fetch_index;
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WARN_ON(ioread32(&rq->ctrl->enable));
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buf = rq->to_clean;
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while (vnic_rq_desc_used(rq) > 0) {
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(*buf_clean)(rq, buf);
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buf = rq->to_clean = buf->next;
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rq->ring.desc_avail++;
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}
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/* Use current fetch_index as the ring starting point */
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fetch_index = ioread32(&rq->ctrl->fetch_index);
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rq->to_use = rq->to_clean =
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&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
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[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
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iowrite32(fetch_index, &rq->ctrl->posted_index);
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rq->buf_index = 0;
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vnic_dev_clear_desc_ring(&rq->ring);
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}
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