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_rq.h" 26 27static int vnic_rq_alloc_bufs(struct vnic_rq *rq) 28{ 29 struct vnic_rq_buf *buf; 30 struct vnic_dev *vdev; 31 unsigned int i, j, count = rq->ring.desc_count; 32 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count); 33 34 vdev = rq->vdev; 35 36 for (i = 0; i < blks; i++) { 37 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC); 38 if (!rq->bufs[i]) { 39 printk(KERN_ERR "Failed to alloc rq_bufs\n"); 40 return -ENOMEM; 41 } 42 } 43 44 for (i = 0; i < blks; i++) { 45 buf = rq->bufs[i]; 46 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) { 47 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j; 48 buf->desc = (u8 *)rq->ring.descs + 49 rq->ring.desc_size * buf->index; 50 if (buf->index + 1 == count) { 51 buf->next = rq->bufs[0]; 52 break; 53 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) { 54 buf->next = rq->bufs[i + 1]; 55 } else { 56 buf->next = buf + 1; 57 buf++; 58 } 59 } 60 } 61 62 rq->to_use = rq->to_clean = rq->bufs[0]; 63 rq->buf_index = 0; 64 65 return 0; 66} 67 68void vnic_rq_free(struct vnic_rq *rq) 69{ 70 struct vnic_dev *vdev; 71 unsigned int i; 72 73 vdev = rq->vdev; 74 75 vnic_dev_free_desc_ring(vdev, &rq->ring); 76 77 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) { 78 kfree(rq->bufs[i]); 79 rq->bufs[i] = NULL; 80 } 81 82 rq->ctrl = NULL; 83} 84 85int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, 86 unsigned int desc_count, unsigned int desc_size) 87{ 88 int err; 89 90 rq->index = index; 91 rq->vdev = vdev; 92 93 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index); 94 if (!rq->ctrl) { 95 printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index); 96 return -EINVAL; 97 } 98 99 vnic_rq_disable(rq); 100 101 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size); 102 if (err) 103 return err; 104 105 err = vnic_rq_alloc_bufs(rq); 106 if (err) { 107 vnic_rq_free(rq); 108 return err; 109 } 110 111 return 0; 112} 113 114void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, 115 unsigned int error_interrupt_enable, 116 unsigned int error_interrupt_offset) 117{ 118 u64 paddr; 119 u32 fetch_index; 120 121 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; 122 writeq(paddr, &rq->ctrl->ring_base); 123 iowrite32(rq->ring.desc_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); 129 130 /* Use current fetch_index as the ring starting point */ 131 fetch_index = ioread32(&rq->ctrl->fetch_index); 132 rq->to_use = rq->to_clean = 133 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] 134 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; 135 iowrite32(fetch_index, &rq->ctrl->posted_index); 136 137 rq->buf_index = 0; 138} 139 140unsigned int vnic_rq_error_status(struct vnic_rq *rq) 141{ 142 return ioread32(&rq->ctrl->error_status); 143} 144 145void vnic_rq_enable(struct vnic_rq *rq) 146{ 147 iowrite32(1, &rq->ctrl->enable); 148} 149 150int vnic_rq_disable(struct vnic_rq *rq) 151{ 152 unsigned int wait; 153 154 iowrite32(0, &rq->ctrl->enable); 155 156 /* Wait for HW to ACK disable request */ 157 for (wait = 0; wait < 100; wait++) { 158 if (!(ioread32(&rq->ctrl->running))) 159 return 0; 160 udelay(1); 161 } 162 163 printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index); 164 165 return -ETIMEDOUT; 166} 167 168void vnic_rq_clean(struct vnic_rq *rq, 169 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) 170{ 171 struct vnic_rq_buf *buf; 172 u32 fetch_index; 173 174 BUG_ON(ioread32(&rq->ctrl->enable)); 175 176 buf = rq->to_clean; 177 178 while (vnic_rq_desc_used(rq) > 0) { 179 180 (*buf_clean)(rq, buf); 181 182 buf = rq->to_clean = buf->next; 183 rq->ring.desc_avail++; 184 } 185 186 /* Use current fetch_index as the ring starting point */ 187 fetch_index = ioread32(&rq->ctrl->fetch_index); 188 rq->to_use = rq->to_clean = 189 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] 190 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; 191 iowrite32(fetch_index, &rq->ctrl->posted_index); 192 193 rq->buf_index = 0; 194 195 vnic_dev_clear_desc_ring(&rq->ring); 196} 197