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#define _GNU_SOURCE
#include <doca_error.h>
#include <doca_dev.h>
#include <doca_mmap.h>
#include <errno.h>
#include <getopt.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#define META_MAGIC 0x444f4341444d4131ULL /* "DOCADMA1" */
#define DEFAULT_DESC_PATH "descriptor.bin"
#define DEFAULT_BUF_PATH "buffer.json"
static void die_errno(const char *what)
{
fprintf(stderr, "%s: %s\n", what, strerror(errno));
exit(EXIT_FAILURE);
}
static void die_doca(const char *what, doca_error_t err)
{
fprintf(stderr, "%s: DOCA error code %d\n", what, (int)err);
exit(EXIT_FAILURE);
}
static int write_file_all(const char *path, const void *data, size_t len)
{
FILE *f = fopen(path, "wb");
if (f == NULL)
return -1;
if (len > 0 && fwrite(data, 1, len, f) != len) {
fclose(f);
return -1;
}
if (fclose(f) != 0)
return -1;
return 0;
}
static int write_remote_buffer_json(const char *path, uintptr_t addr, size_t len)
{
FILE *f = fopen(path, "w");
if (f == NULL)
return -1;
fprintf(f,
"{\n"
" \"magic\": \"0x%016" PRIx64 "\",\n"
" \"addr\": \"0x%016" PRIxPTR "\",\n"
" \"len\": %" PRIu64 "\n"
"}\n",
(uint64_t)META_MAGIC,
addr,
(uint64_t)len);
if (fclose(f) != 0)
return -1;
return 0;
}
static doca_error_t open_doca_device_by_pci(const char *pci_addr,
struct doca_dev **dev)
{
struct doca_devinfo **dev_list = NULL;
uint32_t nb_devs = 0;
doca_error_t result;
uint32_t i;
result = doca_devinfo_create_list(&dev_list, &nb_devs);
if (result != DOCA_SUCCESS)
return result;
for (i = 0; i < nb_devs; i++) {
uint8_t is_equal = 0;
if (pci_addr == NULL) {
result = doca_dev_open(dev_list[i], dev);
doca_devinfo_destroy_list(dev_list);
return result;
}
result = doca_devinfo_is_equal_pci_addr(dev_list[i],
pci_addr,
&is_equal);
if (result == DOCA_SUCCESS && is_equal) {
result = doca_dev_open(dev_list[i], dev);
doca_devinfo_destroy_list(dev_list);
return result;
}
}
doca_devinfo_destroy_list(dev_list);
return DOCA_ERROR_NOT_FOUND;
}
static doca_error_t create_started_host_mmap(struct doca_dev *dev,
void *addr,
size_t len,
struct doca_mmap **mmap)
{
doca_error_t result;
/*
* DOCA 2.x commonly uses:
* doca_mmap_create(const union doca_data *user_data, struct doca_mmap **mmap)
*/
result = doca_mmap_create(mmap);
if (result != DOCA_SUCCESS)
return result;
result = doca_mmap_set_memrange(*mmap, addr, len);
if (result != DOCA_SUCCESS)
goto destroy;
result = doca_mmap_set_permissions(*mmap, DOCA_ACCESS_FLAG_PCI_READ_WRITE);
if (result != DOCA_SUCCESS)
goto destroy;
result = doca_mmap_add_dev(*mmap, dev);
if (result != DOCA_SUCCESS)
goto destroy;
result = doca_mmap_start(*mmap);
if (result != DOCA_SUCCESS)
goto destroy;
return DOCA_SUCCESS;
destroy:
doca_mmap_destroy(*mmap);
*mmap = NULL;
return result;
}
static void usage(const char *prog)
{
fprintf(stderr,
"Usage: %s -p <host-pci-bdf> -s <bytes> -o <output-file> "
"[-d descriptor.bin] [-b buffer.json]\n\n"
"Example:\n"
" sudo %s -p 0000:3b:00.0 -s 268435456 -o received_256M.bin\n",
prog, prog);
}
int main(int argc, char **argv)
{
const char *pci = NULL;
const char *out_path = NULL;
const char *desc_path = DEFAULT_DESC_PATH;
const char *buf_path = DEFAULT_BUF_PATH;
size_t size = 0;
struct doca_dev *dev = NULL;
struct doca_mmap *mmap = NULL;
void *host_buf = NULL;
const void *export_desc = NULL;
size_t export_desc_len = 0;
int opt;
doca_error_t result;
while ((opt = getopt(argc, argv, "p:s:o:d:b:h")) != -1) {
switch (opt) {
case 'p':
pci = optarg;
break;
case 's':
size = strtoull(optarg, NULL, 0);
break;
case 'o':
out_path = optarg;
break;
case 'd':
desc_path = optarg;
break;
case 'b':
buf_path = optarg;
break;
case 'h':
default:
usage(argv[0]);
return EXIT_FAILURE;
}
}
if (pci == NULL || out_path == NULL || size == 0) {
usage(argv[0]);
return EXIT_FAILURE;
}
result = open_doca_device_by_pci(pci, &dev);
if (result != DOCA_SUCCESS)
die_doca("open_doca_device_by_pci", result);
if (posix_memalign(&host_buf, 4096, size) != 0)
die_errno("posix_memalign");
memset(host_buf, 0, size);
result = create_started_host_mmap(dev, host_buf, size, &mmap);
if (result != DOCA_SUCCESS)
die_doca("create_started_host_mmap", result);
result = doca_mmap_export_pci(mmap, dev, &export_desc, &export_desc_len);
if (result != DOCA_SUCCESS)
die_doca("doca_mmap_export_pci", result);
if (export_desc == NULL || export_desc_len == 0) {
fprintf(stderr, "doca_mmap_export_pci returned empty descriptor\n");
exit(EXIT_FAILURE);
}
if (write_file_all(desc_path, export_desc, export_desc_len) != 0)
die_errno("write descriptor");
if (write_remote_buffer_json(buf_path, (uintptr_t)host_buf, size) != 0)
die_errno("write buffer metadata");
printf("Host receive buffer exported.\n");
printf(" descriptor: %s (%zu bytes)\n", desc_path, export_desc_len);
printf(" buffer: %s\n", buf_path);
printf(" addr: 0x%016" PRIxPTR "\n", (uintptr_t)host_buf);
printf(" len: %zu\n", size);
printf("\nCopy %s and %s to the DPU, run dpu sender, then press ENTER here.\n",
desc_path, buf_path);
(void)getchar();
if (write_file_all(out_path, host_buf, size) != 0)
die_errno("write output file");
printf("Wrote host buffer to %s\n", out_path);
doca_mmap_destroy(mmap);
doca_dev_close(dev);
free(host_buf);
return EXIT_SUCCESS;
}
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