drivers/net/enic/vnic_rq.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_rq.h"
  28
  29 static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
  30 {
  31         struct vnic_rq_buf *buf;
  32         struct vnic_dev *vdev;
  33         unsigned int i, j, count = rq->ring.desc_count;
  34         unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
  35
  36         vdev = rq->vdev;
  37
  38         for (i = 0; i < blks; i++) {
  39                 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC);
  40                 if (!rq->bufs[i]) {
  41                         printk(KERN_ERR "Failed to alloc rq_bufs\n");
  42                         return -ENOMEM;
  43                 }
  44         }
  45
  46         for (i = 0; i < blks; i++) {
  47                 buf = rq->bufs[i];
  48                 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) {
  49                         buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j;
  50                         buf->desc = (u8 *)rq->ring.descs +
  51                                 rq->ring.desc_size * buf->index;
  52                         if (buf->index + 1 == count) {
  53                                 buf->next = rq->bufs[0];
  54                                 break;
  55                         } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) {
  56                                 buf->next = rq->bufs[i + 1];
  57                         } else {
  58                                 buf->next = buf + 1;
  59                                 buf++;
  60                         }
  61                 }
  62         }
  63
  64         rq->to_use = rq->to_clean = rq->bufs[0];
  65         rq->buf_index = 0;
  66
  67         return 0;
  68 }
  69
  70 void vnic_rq_free(struct vnic_rq *rq)
  71 {
  72         struct vnic_dev *vdev;
  73         unsigned int i;
  74
  75         vdev = rq->vdev;
  76
  77         vnic_dev_free_desc_ring(vdev, &rq->ring);
  78
  79         for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
  80                 kfree(rq->bufs[i]);
  81                 rq->bufs[i] = NULL;
  82         }
  83
  84         rq->ctrl = NULL;
  85 }
  86
  87 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
  88         unsigned int desc_count, unsigned int desc_size)
  89 {
  90         int err;
  91
  92         rq->index = index;
  93         rq->vdev = vdev;
  94
  95         rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
  96         if (!rq->ctrl) {
  97                 printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index);
  98                 return -EINVAL;
  99         }
 100
 101         vnic_rq_disable(rq);
 102
 103         err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
 104         if (err)
 105                 return err;
 106
 107         err = vnic_rq_alloc_bufs(rq);
 108         if (err) {
 109                 vnic_rq_free(rq);
 110                 return err;
 111         }
 112
 113         return 0;
 114 }
 115
 116 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
 117         unsigned int error_interrupt_enable,
 118         unsigned int error_interrupt_offset)
 119 {
 120         u64 paddr;
 121         u32 fetch_index;
 122
 123         paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
 124         writeq(paddr, &rq->ctrl->ring_base);
 125         iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size);
 126         iowrite32(cq_index, &rq->ctrl->cq_index);
 127         iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
 128         iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
 129         iowrite32(0, &rq->ctrl->dropped_packet_count);
 130         iowrite32(0, &rq->ctrl->error_status);
 131
 132         /* Use current fetch_index as the ring starting point */
 133         fetch_index = ioread32(&rq->ctrl->fetch_index);
 134         rq->to_use = rq->to_clean =
 135                 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
 136                         [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
 137         iowrite32(fetch_index, &rq->ctrl->posted_index);
 138
 139         rq->buf_index = 0;
 140 }
 141
 142 unsigned int vnic_rq_error_status(struct vnic_rq *rq)
 143 {
 144         return ioread32(&rq->ctrl->error_status);
 145 }
 146
 147 void vnic_rq_enable(struct vnic_rq *rq)
 148 {
 149         iowrite32(1, &rq->ctrl->enable);
 150 }
 151
 152 int vnic_rq_disable(struct vnic_rq *rq)
 153 {
 154         unsigned int wait;
 155
 156         iowrite32(0, &rq->ctrl->enable);
 157
 158         /* Wait for HW to ACK disable request */
 159         for (wait = 0; wait < 100; wait++) {
 160                 if (!(ioread32(&rq->ctrl->running)))
 161                         return 0;
 162                 udelay(1);
 163         }
 164
 165         printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
 166
 167         return -ETIMEDOUT;
 168 }
 169
 170 void vnic_rq_clean(struct vnic_rq *rq,
 171         void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
 172 {
 173         struct vnic_rq_buf *buf;
 174         u32 fetch_index;
 175
 176         BUG_ON(ioread32(&rq->ctrl->enable));
 177
 178         buf = rq->to_clean;
 179
 180         while (vnic_rq_desc_used(rq) > 0) {
 181
 182                 (*buf_clean)(rq, buf);
 183
 184                 buf = rq->to_clean = buf->next;
 185                 rq->ring.desc_avail++;
 186         }
 187
 188         /* Use current fetch_index as the ring starting point */
 189         fetch_index = ioread32(&rq->ctrl->fetch_index);
 190         rq->to_use = rq->to_clean =
 191                 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
 192                         [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
 193         iowrite32(fetch_index, &rq->ctrl->posted_index);
 194
 195         rq->buf_index = 0;
 196
 197         vnic_dev_clear_desc_ring(&rq->ring);
 198 }
 199