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_rq.h" 29 30 static int vnic_rq_alloc_bufs(struct vnic_rq *rq) 31 { 32 struct vnic_rq_buf *buf; 33 struct vnic_dev *vdev; 34 unsigned int i, j, count = rq->ring.desc_count; 35 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count); 36 37 vdev = rq->vdev; 38 39 for (i = 0; i < blks; i++) { 40 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_ATOMIC); 41 if (!rq->bufs[i]) { 42 pr_err("Failed to alloc rq_bufs\n"); 43 return -ENOMEM; 44 } 45 } 46 47 for (i = 0; i < blks; i++) { 48 buf = rq->bufs[i]; 49 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) { 50 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + j; 51 buf->desc = (u8 *)rq->ring.descs + 52 rq->ring.desc_size * buf->index; 53 if (buf->index + 1 == count) { 54 buf->next = rq->bufs[0]; 55 break; 56 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) { 57 buf->next = rq->bufs[i + 1]; 58 } else { 59 buf->next = buf + 1; 60 buf++; 61 } 62 } 63 } 64 65 rq->to_use = rq->to_clean = rq->bufs[0]; 66 67 return 0; 68 } 69 70 void vnic_rq_free(struct vnic_rq *rq) 71 { 72 struct vnic_dev *vdev; 73 unsigned int i; 74 75 vdev = rq->vdev; 76 77 vnic_dev_free_desc_ring(vdev, &rq->ring); 78 79 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) { 80 if (rq->bufs[i]) { 81 kfree(rq->bufs[i]); 82 rq->bufs[i] = NULL; 83 } 84 } 85 86 rq->ctrl = NULL; 87 } 88 89 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, 90 unsigned int desc_count, unsigned int desc_size) 91 { 92 int err; 93 94 rq->index = index; 95 rq->vdev = vdev; 96 97 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index); 98 if (!rq->ctrl) { 99 pr_err("Failed to hook RQ[%d] resource\n", index); 100 return -EINVAL; 101 } 102 103 vnic_rq_disable(rq); 104 105 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size); 106 if (err) 107 return err; 108 109 err = vnic_rq_alloc_bufs(rq); 110 if (err) { 111 vnic_rq_free(rq); 112 return err; 113 } 114 115 return 0; 116 } 117 118 static void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index, 119 unsigned int fetch_index, unsigned int posted_index, 120 unsigned int error_interrupt_enable, 121 unsigned int error_interrupt_offset) 122 { 123 u64 paddr; 124 unsigned int count = rq->ring.desc_count; 125 126 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; 127 writeq(paddr, &rq->ctrl->ring_base); 128 iowrite32(count, &rq->ctrl->ring_size); 129 iowrite32(cq_index, &rq->ctrl->cq_index); 130 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable); 131 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset); 132 iowrite32(0, &rq->ctrl->dropped_packet_count); 133 iowrite32(0, &rq->ctrl->error_status); 134 iowrite32(fetch_index, &rq->ctrl->fetch_index); 135 iowrite32(posted_index, &rq->ctrl->posted_index); 136 137 rq->to_use = rq->to_clean = 138 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)] 139 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)]; 140 } 141 142 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, 143 unsigned int error_interrupt_enable, 144 unsigned int error_interrupt_offset) 145 { 146 u32 fetch_index; 147 148 /* Use current fetch_index as the ring starting point */ 149 fetch_index = ioread32(&rq->ctrl->fetch_index); 150 151 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */ 152 /* Hardware surprise removal: reset fetch_index */ 153 fetch_index = 0; 154 } 155 156 vnic_rq_init_start(rq, cq_index, 157 fetch_index, fetch_index, 158 error_interrupt_enable, 159 error_interrupt_offset); 160 } 161 162 unsigned int vnic_rq_error_status(struct vnic_rq *rq) 163 { 164 return ioread32(&rq->ctrl->error_status); 165 } 166 167 void vnic_rq_enable(struct vnic_rq *rq) 168 { 169 iowrite32(1, &rq->ctrl->enable); 170 } 171 172 int vnic_rq_disable(struct vnic_rq *rq) 173 { 174 unsigned int wait; 175 176 iowrite32(0, &rq->ctrl->enable); 177 178 /* Wait for HW to ACK disable request */ 179 for (wait = 0; wait < 1000; wait++) { 180 if (!(ioread32(&rq->ctrl->running))) 181 return 0; 182 udelay(10); 183 } 184 185 pr_err("Failed to disable RQ[%d]\n", rq->index); 186 187 return -ETIMEDOUT; 188 } 189 190 void vnic_rq_clean(struct vnic_rq *rq, 191 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) 192 { 193 struct vnic_rq_buf *buf; 194 u32 fetch_index; 195 unsigned int count = rq->ring.desc_count; 196 197 buf = rq->to_clean; 198 199 while (vnic_rq_desc_used(rq) > 0) { 200 201 (*buf_clean)(rq, buf); 202 203 buf = rq->to_clean = buf->next; 204 rq->ring.desc_avail++; 205 } 206 207 /* Use current fetch_index as the ring starting point */ 208 fetch_index = ioread32(&rq->ctrl->fetch_index); 209 210 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */ 211 /* Hardware surprise removal: reset fetch_index */ 212 fetch_index = 0; 213 } 214 rq->to_use = rq->to_clean = 215 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)] 216 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)]; 217 iowrite32(fetch_index, &rq->ctrl->posted_index); 218 219 vnic_dev_clear_desc_ring(&rq->ring); 220 } 221 222