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 #include "enic.h"
  30
  31 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
  32 {
  33         struct vnic_wq_buf *buf;
  34         unsigned int i, j, count = wq->ring.desc_count;
  35         unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
  36
  37         for (i = 0; i < blks; i++) {
  38                 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC);
  39                 if (!wq->bufs[i])
  40                         return -ENOMEM;
  41         }
  42
  43         for (i = 0; i < blks; i++) {
  44                 buf = wq->bufs[i];
  45                 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
  46                         buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
  47                         buf->desc = (u8 *)wq->ring.descs +
  48                                 wq->ring.desc_size * buf->index;
  49                         if (buf->index + 1 == count) {
  50                                 buf->next = wq->bufs[0];
  51                                 buf->next->prev = buf;
  52                                 break;
  53                         } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
  54                                 buf->next = wq->bufs[i + 1];
  55                                 buf->next->prev = buf;
  56                         } else {
  57                                 buf->next = buf + 1;
  58                                 buf->next->prev = buf;
  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                 if (wq->bufs[i]) {
  80                         kfree(wq->bufs[i]);
  81                         wq->bufs[i] = NULL;
  82                 }
  83         }
  84
  85         wq->ctrl = NULL;
  86 }
  87
  88 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
  89         unsigned int desc_count, unsigned int desc_size)
  90 {
  91         int err;
  92
  93         wq->index = index;
  94         wq->vdev = vdev;
  95
  96         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
  97         if (!wq->ctrl) {
  98                 vdev_err(vdev, "Failed to hook WQ[%d] resource\n", index);
  99                 return -EINVAL;
 100         }
 101
 102         vnic_wq_disable(wq);
 103
 104         err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
 105         if (err)
 106                 return err;
 107
 108         err = vnic_wq_alloc_bufs(wq);
 109         if (err) {
 110                 vnic_wq_free(wq);
 111                 return err;
 112         }
 113
 114         return 0;
 115 }
 116
 117 int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
 118                           unsigned int desc_count, unsigned int desc_size)
 119 {
 120         int err;
 121
 122         wq->index = 0;
 123         wq->vdev = vdev;
 124
 125         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
 126         if (!wq->ctrl)
 127                 return -EINVAL;
 128         vnic_wq_disable(wq);
 129         err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
 130
 131         return err;
 132 }
 133
 134 void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
 135                         unsigned int fetch_index, unsigned int posted_index,
 136                         unsigned int error_interrupt_enable,
 137                         unsigned int error_interrupt_offset)
 138 {
 139         u64 paddr;
 140         unsigned int count = wq->ring.desc_count;
 141
 142         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 143         writeq(paddr, &wq->ctrl->ring_base);
 144         iowrite32(count, &wq->ctrl->ring_size);
 145         iowrite32(fetch_index, &wq->ctrl->fetch_index);
 146         iowrite32(posted_index, &wq->ctrl->posted_index);
 147         iowrite32(cq_index, &wq->ctrl->cq_index);
 148         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 149         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 150         iowrite32(0, &wq->ctrl->error_status);
 151
 152         wq->to_use = wq->to_clean =
 153                 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
 154                         [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
 155 }
 156
 157 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
 158         unsigned int error_interrupt_enable,
 159         unsigned int error_interrupt_offset)
 160 {
 161         enic_wq_init_start(wq, cq_index, 0, 0,
 162                 error_interrupt_enable,
 163                 error_interrupt_offset);
 164 }
 165
 166 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
 167 {
 168         return ioread32(&wq->ctrl->error_status);
 169 }
 170
 171 void vnic_wq_enable(struct vnic_wq *wq)
 172 {
 173         iowrite32(1, &wq->ctrl->enable);
 174 }
 175
 176 int vnic_wq_disable(struct vnic_wq *wq)
 177 {
 178         unsigned int wait;
 179         struct vnic_dev *vdev = wq->vdev;
 180
 181         iowrite32(0, &wq->ctrl->enable);
 182
 183         /* Wait for HW to ACK disable request */
 184         for (wait = 0; wait < 1000; wait++) {
 185                 if (!(ioread32(&wq->ctrl->running)))
 186                         return 0;
 187                 udelay(10);
 188         }
 189
 190         vdev_neterr(vdev, "Failed to disable WQ[%d]\n", wq->index);
 191
 192         return -ETIMEDOUT;
 193 }
 194
 195 void vnic_wq_clean(struct vnic_wq *wq,
 196         void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
 197 {
 198         struct vnic_wq_buf *buf;
 199
 200         buf = wq->to_clean;
 201
 202         while (vnic_wq_desc_used(wq) > 0) {
 203
 204                 (*buf_clean)(wq, buf);
 205
 206                 buf = wq->to_clean = buf->next;
 207                 wq->ring.desc_avail++;
 208         }
 209
 210         wq->to_use = wq->to_clean = wq->bufs[0];
 211
 212         iowrite32(0, &wq->ctrl->fetch_index);
 213         iowrite32(0, &wq->ctrl->posted_index);
 214         iowrite32(0, &wq->ctrl->error_status);
 215
 216         vnic_dev_clear_desc_ring(&wq->ring);
 217 }