drivers/net/ethernet/cisco/enic/vnic_wq.c

   1 /*
   2  * Copyright 2008-2010 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(count), GFP_ATOMIC);
  41                 if (!wq->bufs[i]) {
  42                         pr_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(count); j++) {
  50                         buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + 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(count)) {
  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                 if (wq->bufs[i]) {
  81                         kfree(wq->bufs[i]);
  82                         wq->bufs[i] = NULL;
  83                 }
  84         }
  85
  86         wq->ctrl = NULL;
  87 }
  88
  89 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
  90         unsigned int desc_count, unsigned int desc_size)
  91 {
  92         int err;
  93
  94         wq->index = index;
  95         wq->vdev = vdev;
  96
  97         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
  98         if (!wq->ctrl) {
  99                 pr_err("Failed to hook WQ[%d] resource\n", index);
 100                 return -EINVAL;
 101         }
 102
 103         vnic_wq_disable(wq);
 104
 105         err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
 106         if (err)
 107                 return err;
 108
 109         err = vnic_wq_alloc_bufs(wq);
 110         if (err) {
 111                 vnic_wq_free(wq);
 112                 return err;
 113         }
 114
 115         return 0;
 116 }
 117
 118 static void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
 119         unsigned int fetch_index, unsigned int posted_index,
 120         unsigned int error_interrupt_enable,
 121         unsigned int error_interrupt_offset)
 122 {
 123         u64 paddr;
 124         unsigned int count = wq->ring.desc_count;
 125
 126         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 127         writeq(paddr, &wq->ctrl->ring_base);
 128         iowrite32(count, &wq->ctrl->ring_size);
 129         iowrite32(fetch_index, &wq->ctrl->fetch_index);
 130         iowrite32(posted_index, &wq->ctrl->posted_index);
 131         iowrite32(cq_index, &wq->ctrl->cq_index);
 132         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 133         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 134         iowrite32(0, &wq->ctrl->error_status);
 135
 136         wq->to_use = wq->to_clean =
 137                 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
 138                         [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
 139 }
 140
 141 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
 142         unsigned int error_interrupt_enable,
 143         unsigned int error_interrupt_offset)
 144 {
 145         vnic_wq_init_start(wq, cq_index, 0, 0,
 146                 error_interrupt_enable,
 147                 error_interrupt_offset);
 148 }
 149
 150 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
 151 {
 152         return ioread32(&wq->ctrl->error_status);
 153 }
 154
 155 void vnic_wq_enable(struct vnic_wq *wq)
 156 {
 157         iowrite32(1, &wq->ctrl->enable);
 158 }
 159
 160 int vnic_wq_disable(struct vnic_wq *wq)
 161 {
 162         unsigned int wait;
 163
 164         iowrite32(0, &wq->ctrl->enable);
 165
 166         /* Wait for HW to ACK disable request */
 167         for (wait = 0; wait < 1000; wait++) {
 168                 if (!(ioread32(&wq->ctrl->running)))
 169                         return 0;
 170                 udelay(10);
 171         }
 172
 173         pr_err("Failed to disable WQ[%d]\n", wq->index);
 174
 175         return -ETIMEDOUT;
 176 }
 177
 178 void vnic_wq_clean(struct vnic_wq *wq,
 179         void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
 180 {
 181         struct vnic_wq_buf *buf;
 182
 183         buf = wq->to_clean;
 184
 185         while (vnic_wq_desc_used(wq) > 0) {
 186
 187                 (*buf_clean)(wq, buf);
 188
 189                 buf = wq->to_clean = buf->next;
 190                 wq->ring.desc_avail++;
 191         }
 192
 193         wq->to_use = wq->to_clean = wq->bufs[0];
 194
 195         iowrite32(0, &wq->ctrl->fetch_index);
 196         iowrite32(0, &wq->ctrl->posted_index);
 197         iowrite32(0, &wq->ctrl->error_status);
 198
 199         vnic_dev_clear_desc_ring(&wq->ring);
 200 }