1 files changed, 251 insertions, 0 deletions
diff --git a/dma/host_recv.c b/dma/host_recv.c
new file mode 100644
index 0000000..9fdffab
--- /dev/null
+++ b/dma/host_recv.c
@@ -0,0 +1,251 @@
+#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;
+}