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                         return -ENOMEM;
  43         }
  44
  45         for (i = 0; i < blks; i++) {
  46                 buf = wq->bufs[i];
  47                 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
  48                         buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
  49                         buf->desc = (u8 *)wq->ring.descs +
  50                                 wq->ring.desc_size * buf->index;
  51                         if (buf->index + 1 == count) {
  52                                 buf->next = wq->bufs[0];
  53                                 break;
  54                         } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
  55                                 buf->next = wq->bufs[i + 1];
  56                         } else {
  57                                 buf->next = buf + 1;
  58                                 buf++;
  59                         }
  60                 }
  61         }
  62
  63         wq->to_use = wq->to_clean = wq->bufs[0];
  64
  65         return 0;
  66 }
  67
  68 void vnic_wq_free(struct vnic_wq *wq)
  69 {
  70         struct vnic_dev *vdev;
  71         unsigned int i;
  72
  73         vdev = wq->vdev;
  74
  75         vnic_dev_free_desc_ring(vdev, &wq->ring);
  76
  77         for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
  78                 if (wq->bufs[i]) {
  79                         kfree(wq->bufs[i]);
  80                         wq->bufs[i] = NULL;
  81                 }
  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                 pr_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 static 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         unsigned int count = wq->ring.desc_count;
 123
 124         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 125         writeq(paddr, &wq->ctrl->ring_base);
 126         iowrite32(count, &wq->ctrl->ring_size);
 127         iowrite32(fetch_index, &wq->ctrl->fetch_index);
 128         iowrite32(posted_index, &wq->ctrl->posted_index);
 129         iowrite32(cq_index, &wq->ctrl->cq_index);
 130         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 131         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 132         iowrite32(0, &wq->ctrl->error_status);
 133
 134         wq->to_use = wq->to_clean =
 135                 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
 136                         [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
 137 }
 138
 139 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
 140         unsigned int error_interrupt_enable,
 141         unsigned int error_interrupt_offset)
 142 {
 143         vnic_wq_init_start(wq, cq_index, 0, 0,
 144                 error_interrupt_enable,
 145                 error_interrupt_offset);
 146 }
 147
 148 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
 149 {
 150         return ioread32(&wq->ctrl->error_status);
 151 }
 152
 153 void vnic_wq_enable(struct vnic_wq *wq)
 154 {
 155         iowrite32(1, &wq->ctrl->enable);
 156 }
 157
 158 int vnic_wq_disable(struct vnic_wq *wq)
 159 {
 160         unsigned int wait;
 161
 162         iowrite32(0, &wq->ctrl->enable);
 163
 164         /* Wait for HW to ACK disable request */
 165         for (wait = 0; wait < 1000; wait++) {
 166                 if (!(ioread32(&wq->ctrl->running)))
 167                         return 0;
 168                 udelay(10);
 169         }
 170
 171         pr_err("Failed to disable WQ[%d]\n", wq->index);
 172
 173         return -ETIMEDOUT;
 174 }
 175
 176 void vnic_wq_clean(struct vnic_wq *wq,
 177         void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
 178 {
 179         struct vnic_wq_buf *buf;
 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 }