1 /* 2 * Copyright 2008-2010 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 20 #include <linux/kernel.h> 21 #include <linux/errno.h> 22 #include <linux/types.h> 23 #include <linux/pci.h> 24 #include <linux/delay.h> 25 #include <linux/slab.h> 26 27 #include "vnic_dev.h" 28 #include "vnic_wq.h" 29 #include "enic.h" 30 31 static int vnic_wq_alloc_bufs(struct vnic_wq *wq) 32 { 33 struct vnic_wq_buf *buf; 34 unsigned int i, j, count = wq->ring.desc_count; 35 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); 36 37 for (i = 0; i < blks; i++) { 38 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_KERNEL); 39 if (!wq->bufs[i]) 40 return -ENOMEM; 41 } 42 43 for (i = 0; i < blks; i++) { 44 buf = wq->bufs[i]; 45 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) { 46 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j; 47 buf->desc = (u8 *)wq->ring.descs + 48 wq->ring.desc_size * buf->index; 49 if (buf->index + 1 == count) { 50 buf->next = wq->bufs[0]; 51 buf->next->prev = buf; 52 break; 53 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) { 54 buf->next = wq->bufs[i + 1]; 55 buf->next->prev = buf; 56 } else { 57 buf->next = buf + 1; 58 buf->next->prev = buf; 59 buf++; 60 } 61 } 62 } 63 64 wq->to_use = wq->to_clean = wq->bufs[0]; 65 66 return 0; 67 } 68 69 void vnic_wq_free(struct vnic_wq *wq) 70 { 71 struct vnic_dev *vdev; 72 unsigned int i; 73 74 vdev = wq->vdev; 75 76 vnic_dev_free_desc_ring(vdev, &wq->ring); 77 78 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { 79 if (wq->bufs[i]) { 80 kfree(wq->bufs[i]); 81 wq->bufs[i] = NULL; 82 } 83 } 84 85 wq->ctrl = NULL; 86 } 87 88 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, 89 unsigned int desc_count, unsigned int desc_size) 90 { 91 int err; 92 93 wq->index = index; 94 wq->vdev = vdev; 95 96 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index); 97 if (!wq->ctrl) { 98 vdev_err(vdev, "Failed to hook WQ[%d] resource\n", index); 99 return -EINVAL; 100 } 101 102 vnic_wq_disable(wq); 103 104 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); 105 if (err) 106 return err; 107 108 err = vnic_wq_alloc_bufs(wq); 109 if (err) { 110 vnic_wq_free(wq); 111 return err; 112 } 113 114 return 0; 115 } 116 117 int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, 118 unsigned int desc_count, unsigned int desc_size) 119 { 120 int err; 121 122 wq->index = 0; 123 wq->vdev = vdev; 124 125 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0); 126 if (!wq->ctrl) 127 return -EINVAL; 128 vnic_wq_disable(wq); 129 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); 130 131 return err; 132 } 133 134 void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, 135 unsigned int fetch_index, unsigned int posted_index, 136 unsigned int error_interrupt_enable, 137 unsigned int error_interrupt_offset) 138 { 139 u64 paddr; 140 unsigned int count = wq->ring.desc_count; 141 142 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; 143 writeq(paddr, &wq->ctrl->ring_base); 144 iowrite32(count, &wq->ctrl->ring_size); 145 iowrite32(fetch_index, &wq->ctrl->fetch_index); 146 iowrite32(posted_index, &wq->ctrl->posted_index); 147 iowrite32(cq_index, &wq->ctrl->cq_index); 148 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); 149 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); 150 iowrite32(0, &wq->ctrl->error_status); 151 152 wq->to_use = wq->to_clean = 153 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)] 154 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)]; 155 } 156 157 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 158 unsigned int error_interrupt_enable, 159 unsigned int error_interrupt_offset) 160 { 161 enic_wq_init_start(wq, cq_index, 0, 0, 162 error_interrupt_enable, 163 error_interrupt_offset); 164 } 165 166 unsigned int vnic_wq_error_status(struct vnic_wq *wq) 167 { 168 return ioread32(&wq->ctrl->error_status); 169 } 170 171 void vnic_wq_enable(struct vnic_wq *wq) 172 { 173 iowrite32(1, &wq->ctrl->enable); 174 } 175 176 int vnic_wq_disable(struct vnic_wq *wq) 177 { 178 unsigned int wait; 179 struct vnic_dev *vdev = wq->vdev; 180 181 iowrite32(0, &wq->ctrl->enable); 182 183 /* Wait for HW to ACK disable request */ 184 for (wait = 0; wait < 1000; wait++) { 185 if (!(ioread32(&wq->ctrl->running))) 186 return 0; 187 udelay(10); 188 } 189 190 vdev_neterr(vdev, "Failed to disable WQ[%d]\n", wq->index); 191 192 return -ETIMEDOUT; 193 } 194 195 void vnic_wq_clean(struct vnic_wq *wq, 196 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) 197 { 198 struct vnic_wq_buf *buf; 199 200 buf = wq->to_clean; 201 202 while (vnic_wq_desc_used(wq) > 0) { 203 204 (*buf_clean)(wq, buf); 205 206 buf = wq->to_clean = buf->next; 207 wq->ring.desc_avail++; 208 } 209 210 wq->to_use = wq->to_clean = wq->bufs[0]; 211 212 iowrite32(0, &wq->ctrl->fetch_index); 213 iowrite32(0, &wq->ctrl->posted_index); 214 iowrite32(0, &wq->ctrl->error_status); 215 216 vnic_dev_clear_desc_ring(&wq->ring); 217 } 218