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237 lines
5.5 KiB
237 lines
5.5 KiB
/* |
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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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#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_wq.h" |
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static inline int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq, |
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unsigned int index, enum vnic_res_type res_type) |
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{ |
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wq->ctrl = svnic_dev_get_res(vdev, res_type, index); |
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if (!wq->ctrl) |
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return -EINVAL; |
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return 0; |
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} |
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static inline int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq, |
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unsigned int index, unsigned int desc_count, unsigned int desc_size) |
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{ |
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return svnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, |
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desc_size); |
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} |
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static int vnic_wq_alloc_bufs(struct vnic_wq *wq) |
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{ |
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struct vnic_wq_buf *buf; |
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unsigned int i, j, count = wq->ring.desc_count; |
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unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); |
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for (i = 0; i < blks; i++) { |
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wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC); |
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if (!wq->bufs[i]) { |
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pr_err("Failed to alloc wq_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 = wq->bufs[i]; |
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for (j = 0; j < VNIC_WQ_BUF_DFLT_BLK_ENTRIES; j++) { |
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buf->index = i * VNIC_WQ_BUF_DFLT_BLK_ENTRIES + j; |
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buf->desc = (u8 *)wq->ring.descs + |
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wq->ring.desc_size * buf->index; |
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if (buf->index + 1 == count) { |
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buf->next = wq->bufs[0]; |
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break; |
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} else if (j + 1 == VNIC_WQ_BUF_DFLT_BLK_ENTRIES) { |
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buf->next = wq->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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wq->to_use = wq->to_clean = wq->bufs[0]; |
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return 0; |
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} |
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void svnic_wq_free(struct vnic_wq *wq) |
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{ |
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struct vnic_dev *vdev; |
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unsigned int i; |
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vdev = wq->vdev; |
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svnic_dev_free_desc_ring(vdev, &wq->ring); |
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for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { |
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kfree(wq->bufs[i]); |
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wq->bufs[i] = NULL; |
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} |
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wq->ctrl = NULL; |
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} |
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int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, |
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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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wq->index = 0; |
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wq->vdev = vdev; |
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err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2); |
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if (err) { |
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pr_err("Failed to get devcmd2 resource\n"); |
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return err; |
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} |
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svnic_wq_disable(wq); |
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err = vnic_wq_alloc_ring(vdev, wq, 0, desc_count, desc_size); |
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if (err) |
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return err; |
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return 0; |
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} |
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int svnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, |
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unsigned int index, unsigned int desc_count, unsigned int desc_size) |
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{ |
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int err; |
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wq->index = index; |
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wq->vdev = vdev; |
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err = vnic_wq_get_ctrl(vdev, wq, index, RES_TYPE_WQ); |
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if (err) { |
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pr_err("Failed to hook WQ[%d] resource\n", index); |
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return err; |
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} |
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svnic_wq_disable(wq); |
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err = vnic_wq_alloc_ring(vdev, wq, index, desc_count, desc_size); |
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if (err) |
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return err; |
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err = vnic_wq_alloc_bufs(wq); |
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if (err) { |
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svnic_wq_free(wq); |
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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_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, |
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unsigned int fetch_index, unsigned int posted_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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unsigned int count = wq->ring.desc_count; |
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paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; |
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writeq(paddr, &wq->ctrl->ring_base); |
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iowrite32(count, &wq->ctrl->ring_size); |
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iowrite32(fetch_index, &wq->ctrl->fetch_index); |
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iowrite32(posted_index, &wq->ctrl->posted_index); |
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iowrite32(cq_index, &wq->ctrl->cq_index); |
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iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); |
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iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); |
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iowrite32(0, &wq->ctrl->error_status); |
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wq->to_use = wq->to_clean = |
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&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)] |
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[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)]; |
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} |
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void svnic_wq_init(struct vnic_wq *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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{ |
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vnic_wq_init_start(wq, cq_index, 0, 0, error_interrupt_enable, |
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error_interrupt_offset); |
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} |
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unsigned int svnic_wq_error_status(struct vnic_wq *wq) |
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{ |
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return ioread32(&wq->ctrl->error_status); |
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} |
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void svnic_wq_enable(struct vnic_wq *wq) |
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{ |
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iowrite32(1, &wq->ctrl->enable); |
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} |
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int svnic_wq_disable(struct vnic_wq *wq) |
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{ |
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unsigned int wait; |
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iowrite32(0, &wq->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(&wq->ctrl->running))) |
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return 0; |
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udelay(1); |
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} |
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pr_err("Failed to disable WQ[%d]\n", wq->index); |
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return -ETIMEDOUT; |
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} |
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void svnic_wq_clean(struct vnic_wq *wq, |
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void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) |
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{ |
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struct vnic_wq_buf *buf; |
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BUG_ON(ioread32(&wq->ctrl->enable)); |
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buf = wq->to_clean; |
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while (svnic_wq_desc_used(wq) > 0) { |
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(*buf_clean)(wq, buf); |
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buf = wq->to_clean = buf->next; |
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wq->ring.desc_avail++; |
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} |
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wq->to_use = wq->to_clean = wq->bufs[0]; |
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iowrite32(0, &wq->ctrl->fetch_index); |
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iowrite32(0, &wq->ctrl->posted_index); |
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iowrite32(0, &wq->ctrl->error_status); |
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svnic_dev_clear_desc_ring(&wq->ring); |
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}
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