drivers/net/enic/vnic_wq.c

   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
  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_wq.h"
  29
  30 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
  31 {
  32         struct vnic_wq_buf *buf;
  33         struct vnic_dev *vdev;
  34         unsigned int i, j, count = wq->ring.desc_count;
  35         unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
  36
  37         vdev = wq->vdev;
  38
  39         for (i = 0; i < blks; i++) {
  40                 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
  41                 if (!wq->bufs[i]) {
  42                         printk(KERN_ERR "Failed to alloc wq_bufs\n");
  43                         return -ENOMEM;
  44                 }
  45         }
  46
  47         for (i = 0; i < blks; i++) {
  48                 buf = wq->bufs[i];
  49                 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
  50                         buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
  51                         buf->desc = (u8 *)wq->ring.descs +
  52                                 wq->ring.desc_size * buf->index;
  53                         if (buf->index + 1 == count) {
  54                                 buf->next = wq->bufs[0];
  55                                 break;
  56                         } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
  57                                 buf->next = wq->bufs[i + 1];
  58                         } else {
  59                                 buf->next = buf + 1;
  60                                 buf++;
  61                         }
  62                 }
  63         }
  64
  65         wq->to_use = wq->to_clean = wq->bufs[0];
  66
  67         return 0;
  68 }
  69
  70 void vnic_wq_free(struct vnic_wq *wq)
  71 {
  72         struct vnic_dev *vdev;
  73         unsigned int i;
  74
  75         vdev = wq->vdev;
  76
  77         vnic_dev_free_desc_ring(vdev, &wq->ring);
  78
  79         for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
  80                 kfree(wq->bufs[i]);
  81                 wq->bufs[i] = NULL;
  82         }
  83
  84         wq->ctrl = NULL;
  85 }
  86
  87 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
  88         unsigned int desc_count, unsigned int desc_size)
  89 {
  90         int err;
  91
  92         wq->index = index;
  93         wq->vdev = vdev;
  94
  95         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
  96         if (!wq->ctrl) {
  97                 printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
  98                 return -EINVAL;
  99         }
 100
 101         vnic_wq_disable(wq);
 102
 103         err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
 104         if (err)
 105                 return err;
 106
 107         err = vnic_wq_alloc_bufs(wq);
 108         if (err) {
 109                 vnic_wq_free(wq);
 110                 return err;
 111         }
 112
 113         return 0;
 114 }
 115
 116 void vnic_wq_init_start(struct vnic_wq *wq, 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
 123         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 124         writeq(paddr, &wq->ctrl->ring_base);
 125         iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
 126         iowrite32(fetch_index, &wq->ctrl->fetch_index);
 127         iowrite32(posted_index, &wq->ctrl->posted_index);
 128         iowrite32(cq_index, &wq->ctrl->cq_index);
 129         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 130         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 131         iowrite32(0, &wq->ctrl->error_status);
 132
 133         wq->to_use = wq->to_clean =
 134                 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
 135                         [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
 136 }
 137
 138 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
 139         unsigned int error_interrupt_enable,
 140         unsigned int error_interrupt_offset)
 141 {
 142         vnic_wq_init_start(wq, cq_index, 0, 0,
 143                 error_interrupt_enable,
 144                 error_interrupt_offset);
 145 }
 146
 147 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
 148 {
 149         return ioread32(&wq->ctrl->error_status);
 150 }
 151
 152 void vnic_wq_enable(struct vnic_wq *wq)
 153 {
 154         iowrite32(1, &wq->ctrl->enable);
 155 }
 156
 157 int vnic_wq_disable(struct vnic_wq *wq)
 158 {
 159         unsigned int wait;
 160
 161         iowrite32(0, &wq->ctrl->enable);
 162
 163         /* Wait for HW to ACK disable request */
 164         for (wait = 0; wait < 1000; wait++) {
 165                 if (!(ioread32(&wq->ctrl->running)))
 166                         return 0;
 167                 udelay(10);
 168         }
 169
 170         printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
 171
 172         return -ETIMEDOUT;
 173 }
 174
 175 void vnic_wq_clean(struct vnic_wq *wq,
 176         void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
 177 {
 178         struct vnic_wq_buf *buf;
 179
 180         BUG_ON(ioread32(&wq->ctrl->enable));
 181
 182         buf = wq->to_clean;
 183
 184         while (vnic_wq_desc_used(wq) > 0) {
 185
 186                 (*buf_clean)(wq, buf);
 187
 188                 buf = wq->to_clean = buf->next;
 189                 wq->ring.desc_avail++;
 190         }
 191
 192         wq->to_use = wq->to_clean = wq->bufs[0];
 193
 194         iowrite32(0, &wq->ctrl->fetch_index);
 195         iowrite32(0, &wq->ctrl->posted_index);
 196         iowrite32(0, &wq->ctrl->error_status);
 197
 198         vnic_dev_clear_desc_ring(&wq->ring);
 199 }