examples/vhost/ioat.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2020 Intel Corporation
   3  */
   4 #include <rte_rawdev.h>
   5 #include <rte_ioat_rawdev.h>
   6 #include <sys/uio.h>
   7
   8 #include "ioat.h"
   9 #include "main.h"
  10
  11 struct dma_for_vhost dma_bind[MAX_VHOST_DEVICE];
  12
  13 struct packet_tracker {
  14         unsigned short size_track[MAX_ENQUEUED_SIZE];
  15         unsigned short next_read;
  16         unsigned short next_write;
  17         unsigned short last_remain;
  18 };
  19
  20 struct packet_tracker cb_tracker[MAX_VHOST_DEVICE];
  21
  22
  23 int
  24 open_ioat(const char *value)
  25 {
  26         struct dma_for_vhost *dma_info = dma_bind;
  27         char *input = strndup(value, strlen(value) + 1);
  28         char *addrs = input;
  29         char *ptrs[2];
  30         char *start, *end, *substr;
  31         int64_t vid, vring_id;
  32         struct rte_ioat_rawdev_config config;
  33         struct rte_rawdev_info info = { .dev_private = &config };
  34         char name[32];
  35         int dev_id;
  36         int ret = 0;
  37         uint16_t i = 0;
  38         char *dma_arg[MAX_VHOST_DEVICE];
  39         int args_nr;
  40
  41         while (isblank(*addrs))
  42                 addrs++;
  43         if (*addrs == '\0') {
  44                 ret = -1;
  45                 goto out;
  46         }
  47
  48         /* process DMA devices within bracket. */
  49         addrs++;
  50         substr = strtok(addrs, ";]");
  51         if (!substr) {
  52                 ret = -1;
  53                 goto out;
  54         }
  55         args_nr = rte_strsplit(substr, strlen(substr),
  56                         dma_arg, MAX_VHOST_DEVICE, ',');
  57         if (args_nr <= 0) {
  58                 ret = -1;
  59                 goto out;
  60         }
  61         while (i < args_nr) {
  62                 char *arg_temp = dma_arg[i];
  63                 uint8_t sub_nr;
  64                 sub_nr = rte_strsplit(arg_temp, strlen(arg_temp), ptrs, 2, '@');
  65                 if (sub_nr != 2) {
  66                         ret = -1;
  67                         goto out;
  68                 }
  69
  70                 start = strstr(ptrs[0], "txd");
  71                 if (start == NULL) {
  72                         ret = -1;
  73                         goto out;
  74                 }
  75
  76                 start += 3;
  77                 vid = strtol(start, &end, 0);
  78                 if (end == start) {
  79                         ret = -1;
  80                         goto out;
  81                 }
  82
  83                 vring_id = 0 + VIRTIO_RXQ;
  84                 if (rte_pci_addr_parse(ptrs[1],
  85                                 &(dma_info + vid)->dmas[vring_id].addr) < 0) {
  86                         ret = -1;
  87                         goto out;
  88                 }
  89
  90                 rte_pci_device_name(&(dma_info + vid)->dmas[vring_id].addr,
  91                                 name, sizeof(name));
  92                 dev_id = rte_rawdev_get_dev_id(name);
  93                 if (dev_id == (uint16_t)(-ENODEV) ||
  94                 dev_id == (uint16_t)(-EINVAL)) {
  95                         ret = -1;
  96                         goto out;
  97                 }
  98
  99                 if (rte_rawdev_info_get(dev_id, &info, sizeof(config)) < 0 ||
 100                 strstr(info.driver_name, "ioat") == NULL) {
 101                         ret = -1;
 102                         goto out;
 103                 }
 104
 105                 (dma_info + vid)->dmas[vring_id].dev_id = dev_id;
 106                 (dma_info + vid)->dmas[vring_id].is_valid = true;
 107                 config.ring_size = IOAT_RING_SIZE;
 108                 config.hdls_disable = true;
 109                 if (rte_rawdev_configure(dev_id, &info, sizeof(config)) < 0) {
 110                         ret = -1;
 111                         goto out;
 112                 }
 113                 rte_rawdev_start(dev_id);
 114
 115                 dma_info->nr++;
 116                 i++;
 117         }
 118 out:
 119         free(input);
 120         return ret;
 121 }
 122
 123 uint32_t
 124 ioat_transfer_data_cb(int vid, uint16_t queue_id,
 125                 struct rte_vhost_async_desc *descs,
 126                 struct rte_vhost_async_status *opaque_data, uint16_t count)
 127 {
 128         uint32_t i_desc;
 129         int dev_id = dma_bind[vid].dmas[queue_id * 2 + VIRTIO_RXQ].dev_id;
 130         struct rte_vhost_iov_iter *src = NULL;
 131         struct rte_vhost_iov_iter *dst = NULL;
 132         unsigned long i_seg;
 133         unsigned short mask = MAX_ENQUEUED_SIZE - 1;
 134         unsigned short write = cb_tracker[dev_id].next_write;
 135
 136         if (!opaque_data) {
 137                 for (i_desc = 0; i_desc < count; i_desc++) {
 138                         src = descs[i_desc].src;
 139                         dst = descs[i_desc].dst;
 140                         i_seg = 0;
 141                         while (i_seg < src->nr_segs) {
 142                                 /*
 143                                  * TODO: Assuming that the ring space of the
 144                                  * IOAT device is large enough, so there is no
 145                                  * error here, and the actual error handling
 146                                  * will be added later.
 147                                  */
 148                                 rte_ioat_enqueue_copy(dev_id,
 149                                         (uintptr_t)(src->iov[i_seg].iov_base)
 150                                                 + src->offset,
 151                                         (uintptr_t)(dst->iov[i_seg].iov_base)
 152                                                 + dst->offset,
 153                                         src->iov[i_seg].iov_len,
 154                                         0,
 155                                         0);
 156                                 i_seg++;
 157                         }
 158                         write &= mask;
 159                         cb_tracker[dev_id].size_track[write] = i_seg;
 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                 unsigned short 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                 int dev_id = dma_bind[vid].dmas[queue_id * 2
 185                                 + VIRTIO_RXQ].dev_id;
 186                 n_seg = rte_ioat_completed_ops(dev_id, 255, dump, dump);
 187                 n_seg += cb_tracker[dev_id].last_remain;
 188                 if (!n_seg)
 189                         return 0;
 190                 read = cb_tracker[dev_id].next_read;
 191                 write = cb_tracker[dev_id].next_write;
 192                 for (i = 0; i < max_packets; i++) {
 193                         read &= mask;
 194                         if (read == write)
 195                                 break;
 196                         if (n_seg >= cb_tracker[dev_id].size_track[read]) {
 197                                 n_seg -= cb_tracker[dev_id].size_track[read];
 198                                 read++;
 199                                 nb_packet++;
 200                         } else {
 201                                 break;
 202                         }
 203                 }
 204                 cb_tracker[dev_id].next_read = read;
 205                 cb_tracker[dev_id].last_remain = n_seg;
 206                 return nb_packet;
 207         }
 208         /* Opaque data is not supported */
 209         return -1;
 210 }