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 int
  26 open_ioat(const char *value)
  27 {
  28         struct dma_for_vhost *dma_info = dma_bind;
  29         char *input = strndup(value, strlen(value) + 1);
  30         char *addrs = input;
  31         char *ptrs[2];
  32         char *start, *end, *substr;
  33         int64_t vid, vring_id;
  34         struct rte_ioat_rawdev_config config;
  35         struct rte_rawdev_info info = { .dev_private = &config };
  36         char name[32];
  37         int dev_id;
  38         int ret = 0;
  39         uint16_t i = 0;
  40         char *dma_arg[MAX_VHOST_DEVICE];
  41         int args_nr;
  42
  43         while (isblank(*addrs))
  44                 addrs++;
  45         if (*addrs == '\0') {
  46                 ret = -1;
  47                 goto out;
  48         }
  49
  50         /* process DMA devices within bracket. */
  51         addrs++;
  52         substr = strtok(addrs, ";]");
  53         if (!substr) {
  54                 ret = -1;
  55                 goto out;
  56         }
  57         args_nr = rte_strsplit(substr, strlen(substr),
  58                         dma_arg, MAX_VHOST_DEVICE, ',');
  59         if (args_nr <= 0) {
  60                 ret = -1;
  61                 goto out;
  62         }
  63         while (i < args_nr) {
  64                 char *arg_temp = dma_arg[i];
  65                 uint8_t sub_nr;
  66                 sub_nr = rte_strsplit(arg_temp, strlen(arg_temp), ptrs, 2, '@');
  67                 if (sub_nr != 2) {
  68                         ret = -1;
  69                         goto out;
  70                 }
  71
  72                 start = strstr(ptrs[0], "txd");
  73                 if (start == NULL) {
  74                         ret = -1;
  75                         goto out;
  76                 }
  77
  78                 start += 3;
  79                 vid = strtol(start, &end, 0);
  80                 if (end == start) {
  81                         ret = -1;
  82                         goto out;
  83                 }
  84
  85                 vring_id = 0 + VIRTIO_RXQ;
  86                 if (rte_pci_addr_parse(ptrs[1],
  87                                 &(dma_info + vid)->dmas[vring_id].addr) < 0) {
  88                         ret = -1;
  89                         goto out;
  90                 }
  91
  92                 rte_pci_device_name(&(dma_info + vid)->dmas[vring_id].addr,
  93                                 name, sizeof(name));
  94                 dev_id = rte_rawdev_get_dev_id(name);
  95                 if (dev_id == (uint16_t)(-ENODEV) ||
  96                 dev_id == (uint16_t)(-EINVAL)) {
  97                         ret = -1;
  98                         goto out;
  99                 }
 100
 101                 if (rte_rawdev_info_get(dev_id, &info, sizeof(config)) < 0 ||
 102                 strstr(info.driver_name, "ioat") == NULL) {
 103                         ret = -1;
 104                         goto out;
 105                 }
 106
 107                 (dma_info + vid)->dmas[vring_id].dev_id = dev_id;
 108                 (dma_info + vid)->dmas[vring_id].is_valid = true;
 109                 config.ring_size = IOAT_RING_SIZE;
 110                 config.hdls_disable = true;
 111                 if (rte_rawdev_configure(dev_id, &info, sizeof(config)) < 0) {
 112                         ret = -1;
 113                         goto out;
 114                 }
 115                 rte_rawdev_start(dev_id);
 116                 cb_tracker[dev_id].ioat_space = IOAT_RING_SIZE - 1;
 117                 dma_info->nr++;
 118                 i++;
 119         }
 120 out:
 121         free(input);
 122         return ret;
 123 }
 124
 125 int32_t
 126 ioat_transfer_data_cb(int vid, uint16_t queue_id,
 127                 struct rte_vhost_async_desc *descs,
 128                 struct rte_vhost_async_status *opaque_data, uint16_t count)
 129 {
 130         uint32_t i_desc;
 131         uint16_t dev_id = dma_bind[vid].dmas[queue_id * 2 + VIRTIO_RXQ].dev_id;
 132         struct rte_vhost_iov_iter *iter = NULL;
 133         unsigned long i_seg;
 134         unsigned short mask = MAX_ENQUEUED_SIZE - 1;
 135         unsigned short write = cb_tracker[dev_id].next_write;
 136
 137         if (!opaque_data) {
 138                 for (i_desc = 0; i_desc < count; i_desc++) {
 139                         iter = descs[i_desc].iter;
 140                         i_seg = 0;
 141                         if (cb_tracker[dev_id].ioat_space < iter->nr_segs)
 142                                 break;
 143                         while (i_seg < iter->nr_segs) {
 144                                 rte_ioat_enqueue_copy(dev_id,
 145                                         (uintptr_t)(iter->iov[i_seg].src_addr)
 146                                                 + iter->offset,
 147                                         (uintptr_t)(iter->iov[i_seg].dst_addr)
 148                                                 + iter->offset,
 149                                         iter->iov[i_seg].len,
 150                                         0,
 151                                         0);
 152                                 i_seg++;
 153                         }
 154                         write &= mask;
 155                         cb_tracker[dev_id].size_track[write] = iter->nr_segs;
 156                         cb_tracker[dev_id].ioat_space -= iter->nr_segs;
 157                         write++;
 158                 }
 159         } else {
 160                 /* Opaque data is not supported */
 161                 return -1;
 162         }
 163         /* ring the doorbell */
 164         rte_ioat_perform_ops(dev_id);
 165         cb_tracker[dev_id].next_write = write;
 166         return i_desc;
 167 }
 168
 169 int32_t
 170 ioat_check_completed_copies_cb(int vid, uint16_t queue_id,
 171                 struct rte_vhost_async_status *opaque_data,
 172                 uint16_t max_packets)
 173 {
 174         if (!opaque_data) {
 175                 uintptr_t dump[255];
 176                 int n_seg;
 177                 unsigned short read, write;
 178                 unsigned short nb_packet = 0;
 179                 unsigned short mask = MAX_ENQUEUED_SIZE - 1;
 180                 unsigned short i;
 181
 182                 uint16_t dev_id = dma_bind[vid].dmas[queue_id * 2
 183                                 + VIRTIO_RXQ].dev_id;
 184                 n_seg = rte_ioat_completed_ops(dev_id, 255, NULL, NULL, dump, dump);
 185                 if (n_seg < 0) {
 186                         RTE_LOG(ERR,
 187                                 VHOST_DATA,
 188                                 "fail to poll completed buf on IOAT device %u",
 189                                 dev_id);
 190                         return 0;
 191                 }
 192                 if (n_seg == 0)
 193                         return 0;
 194
 195                 cb_tracker[dev_id].ioat_space += n_seg;
 196                 n_seg += cb_tracker[dev_id].last_remain;
 197
 198                 read = cb_tracker[dev_id].next_read;
 199                 write = cb_tracker[dev_id].next_write;
 200                 for (i = 0; i < max_packets; i++) {
 201                         read &= mask;
 202                         if (read == write)
 203                                 break;
 204                         if (n_seg >= cb_tracker[dev_id].size_track[read]) {
 205                                 n_seg -= cb_tracker[dev_id].size_track[read];
 206                                 read++;
 207                                 nb_packet++;
 208                         } else {
 209                                 break;
 210                         }
 211                 }
 212                 cb_tracker[dev_id].next_read = read;
 213                 cb_tracker[dev_id].last_remain = n_seg;
 214                 return nb_packet;
 215         }
 216         /* Opaque data is not supported */
 217         return -1;
 218 }
 219
 220 #endif /* RTE_RAW_IOAT */