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