/* * Copyright 2008 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. */ #include <linux/errno.h> #include <linux/types.h> #include <linux/pci.h> #include <linux/delay.h> #include "vnic_dev.h" #include "vnic_wq.h" static int vnic_wq_alloc_bufs(struct vnic_wq *wq) { struct vnic_wq_buf *buf; struct vnic_dev *vdev; unsigned int i, j, count = wq->ring.desc_count; unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); vdev = wq->vdev; for (i = 0; i < blks; i++) { wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC); if (!wq->bufs[i]) { printk(KERN_ERR "Failed to alloc wq_bufs\n"); return -ENOMEM; } } for (i = 0; i < blks; i++) { buf = wq->bufs[i]; for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) { buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j; buf->desc = (u8 *)wq->ring.descs + wq->ring.desc_size * buf->index; if (buf->index + 1 == count) { buf->next = wq->bufs[0]; break; } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) { buf->next = wq->bufs[i + 1]; } else { buf->next = buf + 1; buf++; } } } wq->to_use = wq->to_clean = wq->bufs[0]; return 0; } void vnic_wq_free(struct vnic_wq *wq) { struct vnic_dev *vdev; unsigned int i; vdev = wq->vdev; vnic_dev_free_desc_ring(vdev, &wq->ring); for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { kfree(wq->bufs[i]); wq->bufs[i] = NULL; } wq->ctrl = NULL; } int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, unsigned int desc_count, unsigned int desc_size) { int err; wq->index = index; wq->vdev = vdev; wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index); if (!wq->ctrl) { printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index); return -EINVAL; } vnic_wq_disable(wq); err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); if (err) return err; err = vnic_wq_alloc_bufs(wq); if (err) { vnic_wq_free(wq); return err; } return 0; } void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, unsigned int error_interrupt_enable, unsigned int error_interrupt_offset) { u64 paddr; paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; writeq(paddr, &wq->ctrl->ring_base); iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size); iowrite32(0, &wq->ctrl->fetch_index); iowrite32(0, &wq->ctrl->posted_index); iowrite32(cq_index, &wq->ctrl->cq_index); iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); iowrite32(0, &wq->ctrl->error_status); } unsigned int vnic_wq_error_status(struct vnic_wq *wq) { return ioread32(&wq->ctrl->error_status); } void vnic_wq_enable(struct vnic_wq *wq) { iowrite32(1, &wq->ctrl->enable); } int vnic_wq_disable(struct vnic_wq *wq) { unsigned int wait; iowrite32(0, &wq->ctrl->enable); /* Wait for HW to ACK disable request */ for (wait = 0; wait < 100; wait++) { if (!(ioread32(&wq->ctrl->running))) return 0; udelay(1); } printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index); return -ETIMEDOUT; } void vnic_wq_clean(struct vnic_wq *wq, void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) { struct vnic_wq_buf *buf; BUG_ON(ioread32(&wq->ctrl->enable)); buf = wq->to_clean; while (vnic_wq_desc_used(wq) > 0) { (*buf_clean)(wq, buf); buf = wq->to_clean = buf->next; wq->ring.desc_avail++; } wq->to_use = wq->to_clean = wq->bufs[0]; iowrite32(0, &wq->ctrl->fetch_index); iowrite32(0, &wq->ctrl->posted_index); iowrite32(0, &wq->ctrl->error_status); vnic_dev_clear_desc_ring(&wq->ring); }