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         unsigned int i, j, count = wq->ring.desc_count;
  34         unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
  35
  36         for (i = 0; i < blks; i++) {
  37                 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC);
  38                 if (!wq->bufs[i])
  39                         return -ENOMEM;
  40         }
  41
  42         for (i = 0; i < blks; i++) {
  43                 buf = wq->bufs[i];
  44                 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
  45                         buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
  46                         buf->desc = (u8 *)wq->ring.descs +
  47                                 wq->ring.desc_size * buf->index;
  48                         if (buf->index + 1 == count) {
  49                                 buf->next = wq->bufs[0];
  50                                 break;
  51                         } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
  52                                 buf->next = wq->bufs[i + 1];
  53                         } else {
  54                                 buf->next = buf + 1;
  55                                 buf++;
  56                         }
  57                 }
  58         }
  59
  60         wq->to_use = wq->to_clean = wq->bufs[0];
  61
  62         return 0;
  63 }
  64
  65 void vnic_wq_free(struct vnic_wq *wq)
  66 {
  67         struct vnic_dev *vdev;
  68         unsigned int i;
  69
  70         vdev = wq->vdev;
  71
  72         vnic_dev_free_desc_ring(vdev, &wq->ring);
  73
  74         for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
  75                 if (wq->bufs[i]) {
  76                         kfree(wq->bufs[i]);
  77                         wq->bufs[i] = NULL;
  78                 }
  79         }
  80
  81         wq->ctrl = NULL;
  82 }
  83
  84 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
  85         unsigned int desc_count, unsigned int desc_size)
  86 {
  87         int err;
  88
  89         wq->index = index;
  90         wq->vdev = vdev;
  91
  92         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
  93         if (!wq->ctrl) {
  94                 pr_err("Failed to hook WQ[%d] resource\n", index);
  95                 return -EINVAL;
  96         }
  97
  98         vnic_wq_disable(wq);
  99
 100         err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
 101         if (err)
 102                 return err;
 103
 104         err = vnic_wq_alloc_bufs(wq);
 105         if (err) {
 106                 vnic_wq_free(wq);
 107                 return err;
 108         }
 109
 110         return 0;
 111 }
 112
 113 static void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
 114         unsigned int fetch_index, unsigned int posted_index,
 115         unsigned int error_interrupt_enable,
 116         unsigned int error_interrupt_offset)
 117 {
 118         u64 paddr;
 119         unsigned int count = wq->ring.desc_count;
 120
 121         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 122         writeq(paddr, &wq->ctrl->ring_base);
 123         iowrite32(count, &wq->ctrl->ring_size);
 124         iowrite32(fetch_index, &wq->ctrl->fetch_index);
 125         iowrite32(posted_index, &wq->ctrl->posted_index);
 126         iowrite32(cq_index, &wq->ctrl->cq_index);
 127         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 128         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 129         iowrite32(0, &wq->ctrl->error_status);
 130
 131         wq->to_use = wq->to_clean =
 132                 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
 133                         [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
 134 }
 135
 136 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
 137         unsigned int error_interrupt_enable,
 138         unsigned int error_interrupt_offset)
 139 {
 140         vnic_wq_init_start(wq, cq_index, 0, 0,
 141                 error_interrupt_enable,
 142                 error_interrupt_offset);
 143 }
 144
 145 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
 146 {
 147         return ioread32(&wq->ctrl->error_status);
 148 }
 149
 150 void vnic_wq_enable(struct vnic_wq *wq)
 151 {
 152         iowrite32(1, &wq->ctrl->enable);
 153 }
 154
 155 int vnic_wq_disable(struct vnic_wq *wq)
 156 {
 157         unsigned int wait;
 158
 159         iowrite32(0, &wq->ctrl->enable);
 160
 161         /* Wait for HW to ACK disable request */
 162         for (wait = 0; wait < 1000; wait++) {
 163                 if (!(ioread32(&wq->ctrl->running)))
 164                         return 0;
 165                 udelay(10);
 166         }
 167
 168         pr_err("Failed to disable WQ[%d]\n", wq->index);
 169
 170         return -ETIMEDOUT;
 171 }
 172
 173 void vnic_wq_clean(struct vnic_wq *wq,
 174         void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
 175 {
 176         struct vnic_wq_buf *buf;
 177
 178         buf = wq->to_clean;
 179
 180         while (vnic_wq_desc_used(wq) > 0) {
 181
 182                 (*buf_clean)(wq, buf);
 183
 184                 buf = wq->to_clean = buf->next;
 185                 wq->ring.desc_avail++;
 186         }
 187
 188         wq->to_use = wq->to_clean = wq->bufs[0];
 189
 190         iowrite32(0, &wq->ctrl->fetch_index);
 191         iowrite32(0, &wq->ctrl->posted_index);
 192         iowrite32(0, &wq->ctrl->error_status);
 193
 194         vnic_dev_clear_desc_ring(&wq->ring);
 195 }