drivers/net/enic/base/vnic_rq.c

   1 /*
   2  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * Copyright (c) 2014, Cisco Systems, Inc.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  * notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  * notice, this list of conditions and the following disclaimer in
  17  * the documentation and/or other materials provided with the
  18  * distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  28  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  30  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  */
  34
  35 #include "vnic_dev.h"
  36 #include "vnic_rq.h"
  37
  38 static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
  39 {
  40         struct vnic_rq_buf *buf;
  41         unsigned int i, j, count = rq->ring.desc_count;
  42         unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
  43
  44         for (i = 0; i < blks; i++) {
  45                 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_ATOMIC);
  46                 if (!rq->bufs[i])
  47                         return -ENOMEM;
  48         }
  49
  50         for (i = 0; i < blks; i++) {
  51                 buf = rq->bufs[i];
  52                 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) {
  53                         buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + j;
  54                         buf->desc = (u8 *)rq->ring.descs +
  55                                 rq->ring.desc_size * buf->index;
  56                         if (buf->index + 1 == count) {
  57                                 buf->next = rq->bufs[0];
  58                                 break;
  59                         } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) {
  60                                 buf->next = rq->bufs[i + 1];
  61                         } else {
  62                                 buf->next = buf + 1;
  63                                 buf++;
  64                         }
  65                 }
  66         }
  67
  68         rq->to_use = rq->to_clean = rq->bufs[0];
  69
  70         return 0;
  71 }
  72
  73 int vnic_rq_mem_size(struct vnic_rq *rq, unsigned int desc_count,
  74         unsigned int desc_size)
  75 {
  76         int mem_size = 0;
  77
  78         mem_size += vnic_dev_desc_ring_size(&rq->ring, desc_count, desc_size);
  79
  80         mem_size += VNIC_RQ_BUF_BLKS_NEEDED(rq->ring.desc_count) *
  81                 VNIC_RQ_BUF_BLK_SZ(rq->ring.desc_count);
  82
  83         return mem_size;
  84 }
  85
  86 void vnic_rq_free(struct vnic_rq *rq)
  87 {
  88         struct vnic_dev *vdev;
  89         unsigned int i;
  90
  91         vdev = rq->vdev;
  92
  93         vnic_dev_free_desc_ring(vdev, &rq->ring);
  94
  95         for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
  96                 if (rq->bufs[i]) {
  97                         kfree(rq->bufs[i]);
  98                         rq->bufs[i] = NULL;
  99                 }
 100         }
 101
 102         rq->ctrl = NULL;
 103 }
 104
 105 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
 106         unsigned int desc_count, unsigned int desc_size)
 107 {
 108         int err;
 109         char res_name[NAME_MAX];
 110         static int instance;
 111
 112         rq->index = index;
 113         rq->vdev = vdev;
 114
 115         rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
 116         if (!rq->ctrl) {
 117                 pr_err("Failed to hook RQ[%d] resource\n", index);
 118                 return -EINVAL;
 119         }
 120
 121         vnic_rq_disable(rq);
 122
 123         snprintf(res_name, sizeof(res_name), "%d-rq-%d", instance++, index);
 124         err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size,
 125                 rq->socket_id, res_name);
 126         if (err)
 127                 return err;
 128
 129         err = vnic_rq_alloc_bufs(rq);
 130         if (err) {
 131                 vnic_rq_free(rq);
 132                 return err;
 133         }
 134
 135         return 0;
 136 }
 137
 138 void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
 139         unsigned int fetch_index, unsigned int posted_index,
 140         unsigned int error_interrupt_enable,
 141         unsigned int error_interrupt_offset)
 142 {
 143         u64 paddr;
 144         unsigned int count = rq->ring.desc_count;
 145
 146         paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
 147         writeq(paddr, &rq->ctrl->ring_base);
 148         iowrite32(count, &rq->ctrl->ring_size);
 149         iowrite32(cq_index, &rq->ctrl->cq_index);
 150         iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
 151         iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
 152         iowrite32(0, &rq->ctrl->dropped_packet_count);
 153         iowrite32(0, &rq->ctrl->error_status);
 154         iowrite32(fetch_index, &rq->ctrl->fetch_index);
 155         iowrite32(posted_index, &rq->ctrl->posted_index);
 156
 157         rq->to_use = rq->to_clean =
 158                 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
 159                         [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
 160 }
 161
 162 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
 163         unsigned int error_interrupt_enable,
 164         unsigned int error_interrupt_offset)
 165 {
 166         u32 fetch_index = 0;
 167         /* Use current fetch_index as the ring starting point */
 168         fetch_index = ioread32(&rq->ctrl->fetch_index);
 169
 170         if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone  */
 171                 /* Hardware surprise removal: reset fetch_index */
 172                 fetch_index = 0;
 173         }
 174
 175         vnic_rq_init_start(rq, cq_index,
 176                 fetch_index, fetch_index,
 177                 error_interrupt_enable,
 178                 error_interrupt_offset);
 179 }
 180
 181 void vnic_rq_error_out(struct vnic_rq *rq, unsigned int error)
 182 {
 183         iowrite32(error, &rq->ctrl->error_status);
 184 }
 185
 186 unsigned int vnic_rq_error_status(struct vnic_rq *rq)
 187 {
 188         return ioread32(&rq->ctrl->error_status);
 189 }
 190
 191 void vnic_rq_enable(struct vnic_rq *rq)
 192 {
 193         iowrite32(1, &rq->ctrl->enable);
 194 }
 195
 196 int vnic_rq_disable(struct vnic_rq *rq)
 197 {
 198         unsigned int wait;
 199
 200         iowrite32(0, &rq->ctrl->enable);
 201
 202         /* Wait for HW to ACK disable request */
 203         for (wait = 0; wait < 1000; wait++) {
 204                 if (!(ioread32(&rq->ctrl->running)))
 205                         return 0;
 206                 udelay(10);
 207         }
 208
 209         pr_err("Failed to disable RQ[%d]\n", rq->index);
 210
 211         return -ETIMEDOUT;
 212 }
 213
 214 void vnic_rq_clean(struct vnic_rq *rq,
 215         void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
 216 {
 217         struct vnic_rq_buf *buf;
 218         u32 fetch_index;
 219         unsigned int count = rq->ring.desc_count;
 220
 221         buf = rq->to_clean;
 222
 223         while (vnic_rq_desc_used(rq) > 0) {
 224
 225                 (*buf_clean)(rq, buf);
 226
 227                 buf = rq->to_clean = buf->next;
 228                 rq->ring.desc_avail++;
 229         }
 230
 231         /* Use current fetch_index as the ring starting point */
 232         fetch_index = ioread32(&rq->ctrl->fetch_index);
 233
 234         if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone  */
 235                 /* Hardware surprise removal: reset fetch_index */
 236                 fetch_index = 0;
 237         }
 238         rq->to_use = rq->to_clean =
 239                 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
 240                         [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
 241         iowrite32(fetch_index, &rq->ctrl->posted_index);
 242
 243         vnic_dev_clear_desc_ring(&rq->ring);
 244 }