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 30static 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 70void 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 kfree(rq->bufs[i]); 81 rq->bufs[i] = NULL; 82 } 83 84 rq->ctrl = NULL; 85} 86 87int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, 88 unsigned int desc_count, unsigned int desc_size) 89{ 90 int err; 91 92 rq->index = index; 93 rq->vdev = vdev; 94 95 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index); 96 if (!rq->ctrl) { 97 pr_err("Failed to hook RQ[%d] resource\n", index); 98 return -EINVAL; 99 } 100 101 vnic_rq_disable(rq); 102 103 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size); 104 if (err) 105 return err; 106 107 err = vnic_rq_alloc_bufs(rq); 108 if (err) { 109 vnic_rq_free(rq); 110 return err; 111 } 112 113 return 0; 114} 115 116void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index, 117 unsigned int fetch_index, unsigned int posted_index, 118 unsigned int error_interrupt_enable, 119 unsigned int error_interrupt_offset) 120{ 121 u64 paddr; 122 unsigned int count = rq->ring.desc_count; 123 124 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; 125 writeq(paddr, &rq->ctrl->ring_base); 126 iowrite32(count, &rq->ctrl->ring_size); 127 iowrite32(cq_index, &rq->ctrl->cq_index); 128 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable); 129 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset); 130 iowrite32(0, &rq->ctrl->dropped_packet_count); 131 iowrite32(0, &rq->ctrl->error_status); 132 iowrite32(fetch_index, &rq->ctrl->fetch_index); 133 iowrite32(posted_index, &rq->ctrl->posted_index); 134 135 rq->to_use = rq->to_clean = 136 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)] 137 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)]; 138} 139 140void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, 141 unsigned int error_interrupt_enable, 142 unsigned int error_interrupt_offset) 143{ 144 u32 fetch_index; 145 146 /* Use current fetch_index as the ring starting point */ 147 fetch_index = ioread32(&rq->ctrl->fetch_index); 148 149 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */ 150 /* Hardware surprise removal: reset fetch_index */ 151 fetch_index = 0; 152 } 153 154 vnic_rq_init_start(rq, cq_index, 155 fetch_index, fetch_index, 156 error_interrupt_enable, 157 error_interrupt_offset); 158} 159 160unsigned int vnic_rq_error_status(struct vnic_rq *rq) 161{ 162 return ioread32(&rq->ctrl->error_status); 163} 164 165void vnic_rq_enable(struct vnic_rq *rq) 166{ 167 iowrite32(1, &rq->ctrl->enable); 168} 169 170int vnic_rq_disable(struct vnic_rq *rq) 171{ 172 unsigned int wait; 173 174 iowrite32(0, &rq->ctrl->enable); 175 176 /* Wait for HW to ACK disable request */ 177 for (wait = 0; wait < 1000; wait++) { 178 if (!(ioread32(&rq->ctrl->running))) 179 return 0; 180 udelay(10); 181 } 182 183 pr_err("Failed to disable RQ[%d]\n", rq->index); 184 185 return -ETIMEDOUT; 186} 187 188void vnic_rq_clean(struct vnic_rq *rq, 189 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) 190{ 191 struct vnic_rq_buf *buf; 192 u32 fetch_index; 193 unsigned int count = rq->ring.desc_count; 194 195 buf = rq->to_clean; 196 197 while (vnic_rq_desc_used(rq) > 0) { 198 199 (*buf_clean)(rq, buf); 200 201 buf = rq->to_clean = buf->next; 202 rq->ring.desc_avail++; 203 } 204 205 /* Use current fetch_index as the ring starting point */ 206 fetch_index = ioread32(&rq->ctrl->fetch_index); 207 208 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */ 209 /* Hardware surprise removal: reset fetch_index */ 210 fetch_index = 0; 211 } 212 rq->to_use = rq->to_clean = 213 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)] 214 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)]; 215 iowrite32(fetch_index, &rq->ctrl->posted_index); 216 217 vnic_dev_clear_desc_ring(&rq->ring); 218} 219