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
  26 #include "vnic_dev.h"
  27 #include "vnic_wq.h"
  28
  29 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
  30 {
  31         struct vnic_wq_buf *buf;
  32         struct vnic_dev *vdev;
  33         unsigned int i, j, count = wq->ring.desc_count;
  34         unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
  35
  36         vdev = wq->vdev;
  37
  38         for (i = 0; i < blks; i++) {
  39                 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
  40                 if (!wq->bufs[i]) {
  41                         printk(KERN_ERR "Failed to alloc wq_bufs\n");
  42                         return -ENOMEM;
  43                 }
  44         }
  45
  46         for (i = 0; i < blks; i++) {
  47                 buf = wq->bufs[i];
  48                 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
  49                         buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
  50                         buf->desc = (u8 *)wq->ring.descs +
  51                                 wq->ring.desc_size * buf->index;
  52                         if (buf->index + 1 == count) {
  53                                 buf->next = wq->bufs[0];
  54                                 break;
  55                         } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
  56                                 buf->next = wq->bufs[i + 1];
  57                         } else {
  58                                 buf->next = buf + 1;
  59                                 buf++;
  60                         }
  61                 }
  62         }
  63
  64         wq->to_use = wq->to_clean = wq->bufs[0];
  65
  66         return 0;
  67 }
  68
  69 void vnic_wq_free(struct vnic_wq *wq)
  70 {
  71         struct vnic_dev *vdev;
  72         unsigned int i;
  73
  74         vdev = wq->vdev;
  75
  76         vnic_dev_free_desc_ring(vdev, &wq->ring);
  77
  78         for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
  79                 kfree(wq->bufs[i]);
  80                 wq->bufs[i] = NULL;
  81         }
  82
  83         wq->ctrl = NULL;
  84 }
  85
  86 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
  87         unsigned int desc_count, unsigned int desc_size)
  88 {
  89         int err;
  90
  91         wq->index = index;
  92         wq->vdev = vdev;
  93
  94         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
  95         if (!wq->ctrl) {
  96                 printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
  97                 return -EINVAL;
  98         }
  99
 100         vnic_wq_disable(wq);
 101
 102         err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
 103         if (err)
 104                 return err;
 105
 106         err = vnic_wq_alloc_bufs(wq);
 107         if (err) {
 108                 vnic_wq_free(wq);
 109                 return err;
 110         }
 111
 112         return 0;
 113 }
 114
 115 void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
 116         unsigned int fetch_index, unsigned int posted_index,
 117         unsigned int error_interrupt_enable,
 118         unsigned int error_interrupt_offset)
 119 {
 120         u64 paddr;
 121
 122         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 123         writeq(paddr, &wq->ctrl->ring_base);
 124         iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
 125         iowrite32(fetch_index, &wq->ctrl->fetch_index);
 126         iowrite32(posted_index, &wq->ctrl->posted_index);
 127         iowrite32(cq_index, &wq->ctrl->cq_index);
 128         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 129         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 130         iowrite32(0, &wq->ctrl->error_status);
 131
 132         wq->to_use = wq->to_clean =
 133                 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
 134                         [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
 135 }
 136
 137 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
 138         unsigned int error_interrupt_enable,
 139         unsigned int error_interrupt_offset)
 140 {
 141         vnic_wq_init_start(wq, cq_index, 0, 0,
 142                 error_interrupt_enable,
 143                 error_interrupt_offset);
 144 }
 145
 146 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
 147 {
 148         return ioread32(&wq->ctrl->error_status);
 149 }
 150
 151 void vnic_wq_enable(struct vnic_wq *wq)
 152 {
 153         iowrite32(1, &wq->ctrl->enable);
 154 }
 155
 156 int vnic_wq_disable(struct vnic_wq *wq)
 157 {
 158         unsigned int wait;
 159
 160         iowrite32(0, &wq->ctrl->enable);
 161
 162         /* Wait for HW to ACK disable request */
 163         for (wait = 0; wait < 100; wait++) {
 164                 if (!(ioread32(&wq->ctrl->running)))
 165                         return 0;
 166                 udelay(1);
 167         }
 168
 169         printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
 170
 171         return -ETIMEDOUT;
 172 }
 173
 174 void vnic_wq_clean(struct vnic_wq *wq,
 175         void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
 176 {
 177         struct vnic_wq_buf *buf;
 178
 179         BUG_ON(ioread32(&wq->ctrl->enable));
 180
 181         buf = wq->to_clean;
 182
 183         while (vnic_wq_desc_used(wq) > 0) {
 184
 185                 (*buf_clean)(wq, buf);
 186
 187                 buf = wq->to_clean = buf->next;
 188                 wq->ring.desc_avail++;
 189         }
 190
 191         wq->to_use = wq->to_clean = wq->bufs[0];
 192
 193         iowrite32(0, &wq->ctrl->fetch_index);
 194         iowrite32(0, &wq->ctrl->posted_index);
 195         iowrite32(0, &wq->ctrl->error_status);
 196
 197         vnic_dev_clear_desc_ring(&wq->ring);
 198 }