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 "vnic_dev.h" 24 #include "vnic_rq.h" 25 26 static int vnic_rq_alloc_bufs(struct vnic_rq *rq) 27 { 28 struct vnic_rq_buf *buf; 29 struct vnic_dev *vdev; 30 unsigned int i, j, count = rq->ring.desc_count; 31 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count); 32 33 vdev = rq->vdev; 34 35 for (i = 0; i < blks; i++) { 36 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC); 37 if (!rq->bufs[i]) { 38 printk(KERN_ERR "Failed to alloc rq_bufs\n"); 39 return -ENOMEM; 40 } 41 } 42 43 for (i = 0; i < blks; i++) { 44 buf = rq->bufs[i]; 45 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) { 46 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j; 47 buf->desc = (u8 *)rq->ring.descs + 48 rq->ring.desc_size * buf->index; 49 if (buf->index + 1 == count) { 50 buf->next = rq->bufs[0]; 51 break; 52 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) { 53 buf->next = rq->bufs[i + 1]; 54 } else { 55 buf->next = buf + 1; 56 buf++; 57 } 58 } 59 } 60 61 rq->to_use = rq->to_clean = rq->bufs[0]; 62 rq->buf_index = 0; 63 64 return 0; 65 } 66 67 void vnic_rq_free(struct vnic_rq *rq) 68 { 69 struct vnic_dev *vdev; 70 unsigned int i; 71 72 vdev = rq->vdev; 73 74 vnic_dev_free_desc_ring(vdev, &rq->ring); 75 76 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) { 77 kfree(rq->bufs[i]); 78 rq->bufs[i] = NULL; 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 printk(KERN_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 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, 114 unsigned int error_interrupt_enable, 115 unsigned int error_interrupt_offset) 116 { 117 u64 paddr; 118 u32 fetch_index; 119 120 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; 121 writeq(paddr, &rq->ctrl->ring_base); 122 iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size); 123 iowrite32(cq_index, &rq->ctrl->cq_index); 124 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable); 125 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset); 126 iowrite32(0, &rq->ctrl->dropped_packet_count); 127 iowrite32(0, &rq->ctrl->error_status); 128 129 /* Use current fetch_index as the ring starting point */ 130 fetch_index = ioread32(&rq->ctrl->fetch_index); 131 rq->to_use = rq->to_clean = 132 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] 133 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; 134 iowrite32(fetch_index, &rq->ctrl->posted_index); 135 136 rq->buf_index = 0; 137 } 138 139 unsigned int vnic_rq_error_status(struct vnic_rq *rq) 140 { 141 return ioread32(&rq->ctrl->error_status); 142 } 143 144 void vnic_rq_enable(struct vnic_rq *rq) 145 { 146 iowrite32(1, &rq->ctrl->enable); 147 } 148 149 int vnic_rq_disable(struct vnic_rq *rq) 150 { 151 unsigned int wait; 152 153 iowrite32(0, &rq->ctrl->enable); 154 155 /* Wait for HW to ACK disable request */ 156 for (wait = 0; wait < 100; wait++) { 157 if (!(ioread32(&rq->ctrl->running))) 158 return 0; 159 udelay(1); 160 } 161 162 printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index); 163 164 return -ETIMEDOUT; 165 } 166 167 void vnic_rq_clean(struct vnic_rq *rq, 168 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) 169 { 170 struct vnic_rq_buf *buf; 171 u32 fetch_index; 172 173 BUG_ON(ioread32(&rq->ctrl->enable)); 174 175 buf = rq->to_clean; 176 177 while (vnic_rq_desc_used(rq) > 0) { 178 179 (*buf_clean)(rq, buf); 180 181 buf = rq->to_clean = buf->next; 182 rq->ring.desc_avail++; 183 } 184 185 /* Use current fetch_index as the ring starting point */ 186 fetch_index = ioread32(&rq->ctrl->fetch_index); 187 rq->to_use = rq->to_clean = 188 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] 189 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; 190 iowrite32(fetch_index, &rq->ctrl->posted_index); 191 192 rq->buf_index = 0; 193 194 vnic_dev_clear_desc_ring(&rq->ring); 195 } 196 197