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 27 static int vnic_rq_alloc_bufs(struct vnic_rq *rq) 28 { 29 struct vnic_rq_buf *buf; 30 unsigned int i, j, count = rq->ring.desc_count; 31 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count); 32 33 for (i = 0; i < blks; i++) { 34 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC); 35 if (!rq->bufs[i]) { 36 printk(KERN_ERR "Failed to alloc rq_bufs\n"); 37 return -ENOMEM; 38 } 39 } 40 41 for (i = 0; i < blks; i++) { 42 buf = rq->bufs[i]; 43 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) { 44 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j; 45 buf->desc = (u8 *)rq->ring.descs + 46 rq->ring.desc_size * buf->index; 47 if (buf->index + 1 == count) { 48 buf->next = rq->bufs[0]; 49 break; 50 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) { 51 buf->next = rq->bufs[i + 1]; 52 } else { 53 buf->next = buf + 1; 54 buf++; 55 } 56 } 57 } 58 59 rq->to_use = rq->to_clean = rq->bufs[0]; 60 rq->buf_index = 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 kfree(rq->bufs[i]); 76 rq->bufs[i] = NULL; 77 } 78 79 rq->ctrl = NULL; 80 } 81 82 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, 83 unsigned int desc_count, unsigned int desc_size) 84 { 85 int err; 86 87 rq->index = index; 88 rq->vdev = vdev; 89 90 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index); 91 if (!rq->ctrl) { 92 printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index); 93 return -EINVAL; 94 } 95 96 vnic_rq_disable(rq); 97 98 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size); 99 if (err) 100 return err; 101 102 err = vnic_rq_alloc_bufs(rq); 103 if (err) { 104 vnic_rq_free(rq); 105 return err; 106 } 107 108 return 0; 109 } 110 111 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, 112 unsigned int error_interrupt_enable, 113 unsigned int error_interrupt_offset) 114 { 115 u64 paddr; 116 u32 fetch_index; 117 118 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; 119 writeq(paddr, &rq->ctrl->ring_base); 120 iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size); 121 iowrite32(cq_index, &rq->ctrl->cq_index); 122 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable); 123 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset); 124 iowrite32(0, &rq->ctrl->dropped_packet_count); 125 iowrite32(0, &rq->ctrl->error_status); 126 127 /* Use current fetch_index as the ring starting point */ 128 fetch_index = ioread32(&rq->ctrl->fetch_index); 129 rq->to_use = rq->to_clean = 130 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] 131 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; 132 iowrite32(fetch_index, &rq->ctrl->posted_index); 133 134 rq->buf_index = 0; 135 } 136 137 unsigned int vnic_rq_error_status(struct vnic_rq *rq) 138 { 139 return ioread32(&rq->ctrl->error_status); 140 } 141 142 void vnic_rq_enable(struct vnic_rq *rq) 143 { 144 iowrite32(1, &rq->ctrl->enable); 145 } 146 147 int vnic_rq_disable(struct vnic_rq *rq) 148 { 149 unsigned int wait; 150 151 iowrite32(0, &rq->ctrl->enable); 152 153 /* Wait for HW to ACK disable request */ 154 for (wait = 0; wait < 100; wait++) { 155 if (!(ioread32(&rq->ctrl->running))) 156 return 0; 157 udelay(1); 158 } 159 160 printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index); 161 162 return -ETIMEDOUT; 163 } 164 165 void vnic_rq_clean(struct vnic_rq *rq, 166 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) 167 { 168 struct vnic_rq_buf *buf; 169 u32 fetch_index; 170 171 WARN_ON(ioread32(&rq->ctrl->enable)); 172 173 buf = rq->to_clean; 174 175 while (vnic_rq_desc_used(rq) > 0) { 176 177 (*buf_clean)(rq, buf); 178 179 buf = rq->to_clean = buf->next; 180 rq->ring.desc_avail++; 181 } 182 183 /* Use current fetch_index as the ring starting point */ 184 fetch_index = ioread32(&rq->ctrl->fetch_index); 185 rq->to_use = rq->to_clean = 186 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] 187 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; 188 iowrite32(fetch_index, &rq->ctrl->posted_index); 189 190 rq->buf_index = 0; 191 192 vnic_dev_clear_desc_ring(&rq->ring); 193 } 194 195