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 #ident "$Id: vnic_rq.c 171146 2014-05-02 07:08:20Z ssujith $"
  35
  36 #include "vnic_dev.h"
  37 #include "vnic_rq.h"
  38
  39 static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
  40 {
  41         struct vnic_rq_buf *buf;
  42         unsigned int i, j, count = rq->ring.desc_count;
  43         unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
  44
  45         for (i = 0; i < blks; i++) {
  46                 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_ATOMIC);
  47                 if (!rq->bufs[i])
  48                         return -ENOMEM;
  49         }
  50
  51         for (i = 0; i < blks; i++) {
  52                 buf = rq->bufs[i];
  53                 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) {
  54                         buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + j;
  55                         buf->desc = (u8 *)rq->ring.descs +
  56                                 rq->ring.desc_size * buf->index;
  57                         if (buf->index + 1 == count) {
  58                                 buf->next = rq->bufs[0];
  59                                 break;
  60                         } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) {
  61                                 buf->next = rq->bufs[i + 1];
  62                         } else {
  63                                 buf->next = buf + 1;
  64                                 buf++;
  65                         }
  66                 }
  67         }
  68
  69         rq->to_use = rq->to_clean = rq->bufs[0];
  70
  71         return 0;
  72 }
  73
  74 int vnic_rq_mem_size(struct vnic_rq *rq, unsigned int desc_count,
  75         unsigned int desc_size)
  76 {
  77         int mem_size = 0;
  78
  79         mem_size += vnic_dev_desc_ring_size(&rq->ring, desc_count, desc_size);
  80
  81         mem_size += VNIC_RQ_BUF_BLKS_NEEDED(rq->ring.desc_count) *
  82                 VNIC_RQ_BUF_BLK_SZ(rq->ring.desc_count);
  83
  84         return mem_size;
  85 }
  86
  87 void vnic_rq_free(struct vnic_rq *rq)
  88 {
  89         struct vnic_dev *vdev;
  90         unsigned int i;
  91
  92         vdev = rq->vdev;
  93
  94         vnic_dev_free_desc_ring(vdev, &rq->ring);
  95
  96         for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
  97                 if (rq->bufs[i]) {
  98                         kfree(rq->bufs[i]);
  99                         rq->bufs[i] = NULL;
 100                 }
 101         }
 102
 103         rq->ctrl = NULL;
 104 }
 105
 106 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
 107         unsigned int desc_count, unsigned int desc_size)
 108 {
 109         int err;
 110         char res_name[NAME_MAX];
 111         static int instance;
 112
 113         rq->index = index;
 114         rq->vdev = vdev;
 115
 116         rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
 117         if (!rq->ctrl) {
 118                 pr_err("Failed to hook RQ[%d] resource\n", index);
 119                 return -EINVAL;
 120         }
 121
 122         vnic_rq_disable(rq);
 123
 124         snprintf(res_name, sizeof(res_name), "%d-rq-%d", instance++, index);
 125         err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size,
 126                 rq->socket_id, res_name);
 127         if (err)
 128                 return err;
 129
 130         err = vnic_rq_alloc_bufs(rq);
 131         if (err) {
 132                 vnic_rq_free(rq);
 133                 return err;
 134         }
 135
 136         return 0;
 137 }
 138
 139 void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
 140         unsigned int fetch_index, unsigned int posted_index,
 141         unsigned int error_interrupt_enable,
 142         unsigned int error_interrupt_offset)
 143 {
 144         u64 paddr;
 145         unsigned int count = rq->ring.desc_count;
 146
 147         paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
 148         writeq(paddr, &rq->ctrl->ring_base);
 149         iowrite32(count, &rq->ctrl->ring_size);
 150         iowrite32(cq_index, &rq->ctrl->cq_index);
 151         iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
 152         iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
 153         iowrite32(0, &rq->ctrl->dropped_packet_count);
 154         iowrite32(0, &rq->ctrl->error_status);
 155         iowrite32(fetch_index, &rq->ctrl->fetch_index);
 156         iowrite32(posted_index, &rq->ctrl->posted_index);
 157
 158         rq->to_use = rq->to_clean =
 159                 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
 160                         [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
 161 }
 162
 163 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
 164         unsigned int error_interrupt_enable,
 165         unsigned int error_interrupt_offset)
 166 {
 167         u32 fetch_index = 0;
 168         /* Use current fetch_index as the ring starting point */
 169         fetch_index = ioread32(&rq->ctrl->fetch_index);
 170
 171         if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone  */
 172                 /* Hardware surprise removal: reset fetch_index */
 173                 fetch_index = 0;
 174         }
 175
 176         vnic_rq_init_start(rq, cq_index,
 177                 fetch_index, fetch_index,
 178                 error_interrupt_enable,
 179                 error_interrupt_offset);
 180 }
 181
 182 void vnic_rq_error_out(struct vnic_rq *rq, unsigned int error)
 183 {
 184         iowrite32(error, &rq->ctrl->error_status);
 185 }
 186
 187 unsigned int vnic_rq_error_status(struct vnic_rq *rq)
 188 {
 189         return ioread32(&rq->ctrl->error_status);
 190 }
 191
 192 void vnic_rq_enable(struct vnic_rq *rq)
 193 {
 194         iowrite32(1, &rq->ctrl->enable);
 195 }
 196
 197 int vnic_rq_disable(struct vnic_rq *rq)
 198 {
 199         unsigned int wait;
 200
 201         iowrite32(0, &rq->ctrl->enable);
 202
 203         /* Wait for HW to ACK disable request */
 204         for (wait = 0; wait < 1000; wait++) {
 205                 if (!(ioread32(&rq->ctrl->running)))
 206                         return 0;
 207                 udelay(10);
 208         }
 209
 210         pr_err("Failed to disable RQ[%d]\n", rq->index);
 211
 212         return -ETIMEDOUT;
 213 }
 214
 215 void vnic_rq_clean(struct vnic_rq *rq,
 216         void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
 217 {
 218         struct vnic_rq_buf *buf;
 219         u32 fetch_index;
 220         unsigned int count = rq->ring.desc_count;
 221
 222         buf = rq->to_clean;
 223
 224         while (vnic_rq_desc_used(rq) > 0) {
 225
 226                 (*buf_clean)(rq, buf);
 227
 228                 buf = rq->to_clean = buf->next;
 229                 rq->ring.desc_avail++;
 230         }
 231
 232         /* Use current fetch_index as the ring starting point */
 233         fetch_index = ioread32(&rq->ctrl->fetch_index);
 234
 235         if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone  */
 236                 /* Hardware surprise removal: reset fetch_index */
 237                 fetch_index = 0;
 238         }
 239         rq->to_use = rq->to_clean =
 240                 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
 241                         [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
 242         iowrite32(fetch_index, &rq->ctrl->posted_index);
 243
 244         vnic_dev_clear_desc_ring(&rq->ring);
 245 }