1/* 2 * Copyright 2008 Cisco Systems, Inc. All rights reserved. 3 * Copyright 2007 Nuova Systems, Inc. All rights reserved. 4 * 5 * This program is free software; you may redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; version 2 of the License. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 16 * SOFTWARE. 17 */ 18 19#include <linux/errno.h> 20#include <linux/types.h> 21#include <linux/pci.h> 22#include <linux/delay.h> 23#include <linux/slab.h> 24#include "vnic_dev.h" 25#include "vnic_wq.h" 26 27static int vnic_wq_alloc_bufs(struct vnic_wq *wq) 28{ 29 struct vnic_wq_buf *buf; 30 struct vnic_dev *vdev; 31 unsigned int i, j, count = wq->ring.desc_count; 32 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); 33 34 vdev = wq->vdev; 35 36 for (i = 0; i < blks; i++) { 37 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC); 38 if (!wq->bufs[i]) { 39 printk(KERN_ERR "Failed to alloc wq_bufs\n"); 40 return -ENOMEM; 41 } 42 } 43 44 for (i = 0; i < blks; i++) { 45 buf = wq->bufs[i]; 46 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) { 47 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j; 48 buf->desc = (u8 *)wq->ring.descs + 49 wq->ring.desc_size * buf->index; 50 if (buf->index + 1 == count) { 51 buf->next = wq->bufs[0]; 52 break; 53 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) { 54 buf->next = wq->bufs[i + 1]; 55 } else { 56 buf->next = buf + 1; 57 buf++; 58 } 59 } 60 } 61 62 wq->to_use = wq->to_clean = wq->bufs[0]; 63 64 return 0; 65} 66 67void vnic_wq_free(struct vnic_wq *wq) 68{ 69 struct vnic_dev *vdev; 70 unsigned int i; 71 72 vdev = wq->vdev; 73 74 vnic_dev_free_desc_ring(vdev, &wq->ring); 75 76 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { 77 kfree(wq->bufs[i]); 78 wq->bufs[i] = NULL; 79 } 80 81 wq->ctrl = NULL; 82 83} 84 85int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, 86 unsigned int desc_count, unsigned int desc_size) 87{ 88 int err; 89 90 wq->index = index; 91 wq->vdev = vdev; 92 93 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index); 94 if (!wq->ctrl) { 95 printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index); 96 return -EINVAL; 97 } 98 99 vnic_wq_disable(wq); 100 101 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); 102 if (err) 103 return err; 104 105 err = vnic_wq_alloc_bufs(wq); 106 if (err) { 107 vnic_wq_free(wq); 108 return err; 109 } 110 111 return 0; 112} 113 114void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 115 unsigned int error_interrupt_enable, 116 unsigned int error_interrupt_offset) 117{ 118 u64 paddr; 119 120 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; 121 writeq(paddr, &wq->ctrl->ring_base); 122 iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size); 123 iowrite32(0, &wq->ctrl->fetch_index); 124 iowrite32(0, &wq->ctrl->posted_index); 125 iowrite32(cq_index, &wq->ctrl->cq_index); 126 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); 127 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); 128 iowrite32(0, &wq->ctrl->error_status); 129} 130 131unsigned int vnic_wq_error_status(struct vnic_wq *wq) 132{ 133 return ioread32(&wq->ctrl->error_status); 134} 135 136void vnic_wq_enable(struct vnic_wq *wq) 137{ 138 iowrite32(1, &wq->ctrl->enable); 139} 140 141int vnic_wq_disable(struct vnic_wq *wq) 142{ 143 unsigned int wait; 144 145 iowrite32(0, &wq->ctrl->enable); 146 147 /* Wait for HW to ACK disable request */ 148 for (wait = 0; wait < 100; wait++) { 149 if (!(ioread32(&wq->ctrl->running))) 150 return 0; 151 udelay(1); 152 } 153 154 printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index); 155 156 return -ETIMEDOUT; 157} 158 159void vnic_wq_clean(struct vnic_wq *wq, 160 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) 161{ 162 struct vnic_wq_buf *buf; 163 164 BUG_ON(ioread32(&wq->ctrl->enable)); 165 166 buf = wq->to_clean; 167 168 while (vnic_wq_desc_used(wq) > 0) { 169 170 (*buf_clean)(wq, buf); 171 172 buf = wq->to_clean = buf->next; 173 wq->ring.desc_avail++; 174 } 175 176 wq->to_use = wq->to_clean = wq->bufs[0]; 177 178 iowrite32(0, &wq->ctrl->fetch_index); 179 iowrite32(0, &wq->ctrl->posted_index); 180 iowrite32(0, &wq->ctrl->error_status); 181 182 vnic_dev_clear_desc_ring(&wq->ring); 183} 184