examples/vhost/ioat.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2020 Intel Corporation
   3  */
   4
   5 #include <sys/uio.h>
   6 #ifdef RTE_RAW_IOAT
   7 #include <rte_rawdev.h>
   8 #include <rte_ioat_rawdev.h>
   9
  10 #include "ioat.h"
  11 #include "main.h"
  12
  13 struct dma_for_vhost dma_bind[MAX_VHOST_DEVICE];
  14
  15 struct packet_tracker {
  16         unsigned short size_track[MAX_ENQUEUED_SIZE];
  17         unsigned short next_read;
  18         unsigned short next_write;
  19         unsigned short last_remain;
  20         unsigned short ioat_space;
  21 };
  22
  23 struct packet_tracker cb_tracker[MAX_VHOST_DEVICE];
  24
  25
  26 int
  27 open_ioat(const char *value)
  28 {
  29         struct dma_for_vhost *dma_info = dma_bind;
  30         char *input = strndup(value, strlen(value) + 1);
  31         char *addrs = input;
  32         char *ptrs[2];
  33         char *start, *end, *substr;
  34         int64_t vid, vring_id;
  35         struct rte_ioat_rawdev_config config;
  36         struct rte_rawdev_info info = { .dev_private = &config };
  37         char name[32];
  38         int dev_id;
  39         int ret = 0;
  40         uint16_t i = 0;
  41         char *dma_arg[MAX_VHOST_DEVICE];
  42         int args_nr;
  43
  44         while (isblank(*addrs))
  45                 addrs++;
  46         if (*addrs == '\0') {
  47                 ret = -1;
  48                 goto out;
  49         }
  50
  51         /* process DMA devices within bracket. */
  52         addrs++;
  53         substr = strtok(addrs, ";]");
  54         if (!substr) {
  55                 ret = -1;
  56                 goto out;
  57         }
  58         args_nr = rte_strsplit(substr, strlen(substr),
  59                         dma_arg, MAX_VHOST_DEVICE, ',');
  60         if (args_nr <= 0) {
  61                 ret = -1;
  62                 goto out;
  63         }
  64         while (i < args_nr) {
  65                 char *arg_temp = dma_arg[i];
  66                 uint8_t sub_nr;
  67                 sub_nr = rte_strsplit(arg_temp, strlen(arg_temp), ptrs, 2, '@');
  68                 if (sub_nr != 2) {
  69                         ret = -1;
  70                         goto out;
  71                 }
  72
  73                 start = strstr(ptrs[0], "txd");
  74                 if (start == NULL) {
  75                         ret = -1;
  76                         goto out;
  77                 }
  78
  79                 start += 3;
  80                 vid = strtol(start, &end, 0);
  81                 if (end == start) {
  82                         ret = -1;
  83                         goto out;
  84                 }
  85
  86                 vring_id = 0 + VIRTIO_RXQ;
  87                 if (rte_pci_addr_parse(ptrs[1],
  88                                 &(dma_info + vid)->dmas[vring_id].addr) < 0) {
  89                         ret = -1;
  90                         goto out;
  91                 }
  92
  93                 rte_pci_device_name(&(dma_info + vid)->dmas[vring_id].addr,
  94                                 name, sizeof(name));
  95                 dev_id = rte_rawdev_get_dev_id(name);
  96                 if (dev_id == (uint16_t)(-ENODEV) ||
  97                 dev_id == (uint16_t)(-EINVAL)) {
  98                         ret = -1;
  99                         goto out;
 100                 }
 101
 102                 if (rte_rawdev_info_get(dev_id, &info, sizeof(config)) < 0 ||
 103                 strstr(info.driver_name, "ioat") == NULL) {
 104                         ret = -1;
 105                         goto out;
 106                 }
 107
 108                 (dma_info + vid)->dmas[vring_id].dev_id = dev_id;
 109                 (dma_info + vid)->dmas[vring_id].is_valid = true;
 110                 config.ring_size = IOAT_RING_SIZE;
 111                 config.hdls_disable = true;
 112                 if (rte_rawdev_configure(dev_id, &info, sizeof(config)) < 0) {
 113                         ret = -1;
 114                         goto out;
 115                 }
 116                 rte_rawdev_start(dev_id);
 117                 cb_tracker[dev_id].ioat_space = IOAT_RING_SIZE;
 118                 dma_info->nr++;
 119                 i++;
 120         }
 121 out:
 122         free(input);
 123         return ret;
 124 }
 125
 126 uint32_t
 127 ioat_transfer_data_cb(int vid, uint16_t queue_id,
 128                 struct rte_vhost_async_desc *descs,
 129                 struct rte_vhost_async_status *opaque_data, uint16_t count)
 130 {
 131         uint32_t i_desc;
 132         int dev_id = dma_bind[vid].dmas[queue_id * 2 + VIRTIO_RXQ].dev_id;
 133         struct rte_vhost_iov_iter *src = NULL;
 134         struct rte_vhost_iov_iter *dst = NULL;
 135         unsigned long i_seg;
 136         unsigned short mask = MAX_ENQUEUED_SIZE - 1;
 137         unsigned short write = cb_tracker[dev_id].next_write;
 138
 139         if (!opaque_data) {
 140                 for (i_desc = 0; i_desc < count; i_desc++) {
 141                         src = descs[i_desc].src;
 142                         dst = descs[i_desc].dst;
 143                         i_seg = 0;
 144                         if (cb_tracker[dev_id].ioat_space < src->nr_segs)
 145                                 break;
 146                         while (i_seg < src->nr_segs) {
 147                                 rte_ioat_enqueue_copy(dev_id,
 148                                         (uintptr_t)(src->iov[i_seg].iov_base)
 149                                                 + src->offset,
 150                                         (uintptr_t)(dst->iov[i_seg].iov_base)
 151                                                 + dst->offset,
 152                                         src->iov[i_seg].iov_len,
 153                                         0,
 154                                         0);
 155                                 i_seg++;
 156                         }
 157                         write &= mask;
 158                         cb_tracker[dev_id].size_track[write] = src->nr_segs;
 159                         cb_tracker[dev_id].ioat_space -= src->nr_segs;
 160                         write++;
 161                 }
 162         } else {
 163                 /* Opaque data is not supported */
 164                 return -1;
 165         }
 166         /* ring the doorbell */
 167         rte_ioat_perform_ops(dev_id);
 168         cb_tracker[dev_id].next_write = write;
 169         return i_desc;
 170 }
 171
 172 uint32_t
 173 ioat_check_completed_copies_cb(int vid, uint16_t queue_id,
 174                 struct rte_vhost_async_status *opaque_data,
 175                 uint16_t max_packets)
 176 {
 177         if (!opaque_data) {
 178                 uintptr_t dump[255];
 179                 int n_seg;
 180                 unsigned short read, write;
 181                 unsigned short nb_packet = 0;
 182                 unsigned short mask = MAX_ENQUEUED_SIZE - 1;
 183                 unsigned short i;
 184
 185                 int dev_id = dma_bind[vid].dmas[queue_id * 2
 186                                 + VIRTIO_RXQ].dev_id;
 187                 n_seg = rte_ioat_completed_ops(dev_id, 255, dump, dump);
 188                 if (n_seg <= 0)
 189                         return 0;
 190
 191                 cb_tracker[dev_id].ioat_space += n_seg;
 192                 n_seg += cb_tracker[dev_id].last_remain;
 193
 194                 read = cb_tracker[dev_id].next_read;
 195                 write = cb_tracker[dev_id].next_write;
 196                 for (i = 0; i < max_packets; i++) {
 197                         read &= mask;
 198                         if (read == write)
 199                                 break;
 200                         if (n_seg >= cb_tracker[dev_id].size_track[read]) {
 201                                 n_seg -= cb_tracker[dev_id].size_track[read];
 202                                 read++;
 203                                 nb_packet++;
 204                         } else {
 205                                 break;
 206                         }
 207                 }
 208                 cb_tracker[dev_id].next_read = read;
 209                 cb_tracker[dev_id].last_remain = n_seg;
 210                 return nb_packet;
 211         }
 212         /* Opaque data is not supported */
 213         return -1;
 214 }
 215
 216 #endif /* RTE_RAW_IOAT */