drivers/net/ethernet/cisco/enic/vnic_wq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/errno.h>
   9 #include <linux/types.h>
  10 #include <linux/pci.h>
  11 #include <linux/delay.h>
  12 #include <linux/slab.h>
  13
  14 #include "vnic_dev.h"
  15 #include "vnic_wq.h"
  16 #include "enic.h"
  17
  18 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
  19 {
  20         struct vnic_wq_buf *buf;
  21         unsigned int i, j, count = wq->ring.desc_count;
  22         unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
  23
  24         for (i = 0; i < blks; i++) {
  25                 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_KERNEL);
  26                 if (!wq->bufs[i])
  27                         return -ENOMEM;
  28         }
  29
  30         for (i = 0; i < blks; i++) {
  31                 buf = wq->bufs[i];
  32                 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
  33                         buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
  34                         buf->desc = (u8 *)wq->ring.descs +
  35                                 wq->ring.desc_size * buf->index;
  36                         if (buf->index + 1 == count) {
  37                                 buf->next = wq->bufs[0];
  38                                 buf->next->prev = buf;
  39                                 break;
  40                         } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
  41                                 buf->next = wq->bufs[i + 1];
  42                                 buf->next->prev = buf;
  43                         } else {
  44                                 buf->next = buf + 1;
  45                                 buf->next->prev = buf;
  46                                 buf++;
  47                         }
  48                 }
  49         }
  50
  51         wq->to_use = wq->to_clean = wq->bufs[0];
  52
  53         return 0;
  54 }
  55
  56 void vnic_wq_free(struct vnic_wq *wq)
  57 {
  58         struct vnic_dev *vdev;
  59         unsigned int i;
  60
  61         vdev = wq->vdev;
  62
  63         vnic_dev_free_desc_ring(vdev, &wq->ring);
  64
  65         for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
  66                 if (wq->bufs[i]) {
  67                         kfree(wq->bufs[i]);
  68                         wq->bufs[i] = NULL;
  69                 }
  70         }
  71
  72         wq->ctrl = NULL;
  73 }
  74
  75 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
  76         unsigned int desc_count, unsigned int desc_size)
  77 {
  78         int err;
  79
  80         wq->index = index;
  81         wq->vdev = vdev;
  82
  83         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
  84         if (!wq->ctrl) {
  85                 vdev_err(vdev, "Failed to hook WQ[%d] resource\n", index);
  86                 return -EINVAL;
  87         }
  88
  89         vnic_wq_disable(wq);
  90
  91         err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
  92         if (err)
  93                 return err;
  94
  95         err = vnic_wq_alloc_bufs(wq);
  96         if (err) {
  97                 vnic_wq_free(wq);
  98                 return err;
  99         }
 100
 101         return 0;
 102 }
 103
 104 int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
 105                           unsigned int desc_count, unsigned int desc_size)
 106 {
 107         int err;
 108
 109         wq->index = 0;
 110         wq->vdev = vdev;
 111
 112         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
 113         if (!wq->ctrl)
 114                 return -EINVAL;
 115         vnic_wq_disable(wq);
 116         err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
 117
 118         return err;
 119 }
 120
 121 void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
 122                         unsigned int fetch_index, unsigned int posted_index,
 123                         unsigned int error_interrupt_enable,
 124                         unsigned int error_interrupt_offset)
 125 {
 126         u64 paddr;
 127         unsigned int count = wq->ring.desc_count;
 128
 129         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 130         writeq(paddr, &wq->ctrl->ring_base);
 131         iowrite32(count, &wq->ctrl->ring_size);
 132         iowrite32(fetch_index, &wq->ctrl->fetch_index);
 133         iowrite32(posted_index, &wq->ctrl->posted_index);
 134         iowrite32(cq_index, &wq->ctrl->cq_index);
 135         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 136         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 137         iowrite32(0, &wq->ctrl->error_status);
 138
 139         wq->to_use = wq->to_clean =
 140                 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
 141                         [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
 142 }
 143
 144 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
 145         unsigned int error_interrupt_enable,
 146         unsigned int error_interrupt_offset)
 147 {
 148         enic_wq_init_start(wq, cq_index, 0, 0,
 149                 error_interrupt_enable,
 150                 error_interrupt_offset);
 151 }
 152
 153 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
 154 {
 155         return ioread32(&wq->ctrl->error_status);
 156 }
 157
 158 void vnic_wq_enable(struct vnic_wq *wq)
 159 {
 160         iowrite32(1, &wq->ctrl->enable);
 161 }
 162
 163 int vnic_wq_disable(struct vnic_wq *wq)
 164 {
 165         unsigned int wait;
 166         struct vnic_dev *vdev = wq->vdev;
 167
 168         iowrite32(0, &wq->ctrl->enable);
 169
 170         /* Wait for HW to ACK disable request */
 171         for (wait = 0; wait < 1000; wait++) {
 172                 if (!(ioread32(&wq->ctrl->running)))
 173                         return 0;
 174                 udelay(10);
 175         }
 176
 177         vdev_neterr(vdev, "Failed to disable WQ[%d]\n", wq->index);
 178
 179         return -ETIMEDOUT;
 180 }
 181
 182 void vnic_wq_clean(struct vnic_wq *wq,
 183         void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
 184 {
 185         struct vnic_wq_buf *buf;
 186
 187         buf = wq->to_clean;
 188
 189         while (vnic_wq_desc_used(wq) > 0) {
 190
 191                 (*buf_clean)(wq, buf);
 192
 193                 buf = wq->to_clean = buf->next;
 194                 wq->ring.desc_avail++;
 195         }
 196
 197         wq->to_use = wq->to_clean = wq->bufs[0];
 198
 199         iowrite32(0, &wq->ctrl->fetch_index);
 200         iowrite32(0, &wq->ctrl->posted_index);
 201         iowrite32(0, &wq->ctrl->error_status);
 202
 203         vnic_dev_clear_desc_ring(&wq->ring);
 204 }