selftests: ncdevmem: Separate out dmabuf provider

[ Upstream commit 8b9049af8066b4705d83bb7847ee3c960fc58d09 ]

So we can plug the other ones in the future if needed.

Reviewed-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20241107181211.3934153-3-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 97c4e094a4b2 ("tests/ncdevmem: Fix double-free of queue array")
Signed-off-by: Sasha Levin <sashal@kernel.org>

tools/testing/selftests/net/ncdevmem.c

@@ -71,17 +71,101 @@ static char *ifname = "eth1";
 static unsigned int ifindex;
 static unsigned int dmabuf_id;
 
-void print_bytes(void *ptr, size_t size)
+struct memory_buffer {
-{
+	int fd;
-	unsigned char *p = ptr;
+	size_t size;
-	int i;
 
-	for (i = 0; i < size; i++)
+	int devfd;
-		printf("%02hhX ", p[i]);
+	int memfd;
-	printf("\n");
+	char *buf_mem;
+};
+
+struct memory_provider {
+	struct memory_buffer *(*alloc)(size_t size);
+	void (*free)(struct memory_buffer *ctx);
+	void (*memcpy_from_device)(void *dst, struct memory_buffer *src,
+				   size_t off, int n);
+};
+
+static struct memory_buffer *udmabuf_alloc(size_t size)
+{
+	struct udmabuf_create create;
+	struct memory_buffer *ctx;
+	int ret;
+
+	ctx = malloc(sizeof(*ctx));
+	if (!ctx)
+		error(1, ENOMEM, "malloc failed");
+
+	ctx->size = size;
+
+	ctx->devfd = open("/dev/udmabuf", O_RDWR);
+	if (ctx->devfd < 0)
+		error(1, errno,
+		      "%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\n",
+		      TEST_PREFIX);
+
+	ctx->memfd = memfd_create("udmabuf-test", MFD_ALLOW_SEALING);
+	if (ctx->memfd < 0)
+		error(1, errno, "%s: [skip,no-memfd]\n", TEST_PREFIX);
+
+	ret = fcntl(ctx->memfd, F_ADD_SEALS, F_SEAL_SHRINK);
+	if (ret < 0)
+		error(1, errno, "%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
+
+	ret = ftruncate(ctx->memfd, size);
+	if (ret == -1)
+		error(1, errno, "%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
+
+	memset(&create, 0, sizeof(create));
+
+	create.memfd = ctx->memfd;
+	create.offset = 0;
+	create.size = size;
+	ctx->fd = ioctl(ctx->devfd, UDMABUF_CREATE, &create);
+	if (ctx->fd < 0)
+		error(1, errno, "%s: [FAIL, create udmabuf]\n", TEST_PREFIX);
+
+	ctx->buf_mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED,
+			    ctx->fd, 0);
+	if (ctx->buf_mem == MAP_FAILED)
+		error(1, errno, "%s: [FAIL, map udmabuf]\n", TEST_PREFIX);
+
+	return ctx;
 }
 
-void print_nonzero_bytes(void *ptr, size_t size)
+static void udmabuf_free(struct memory_buffer *ctx)
+{
+	munmap(ctx->buf_mem, ctx->size);
+	close(ctx->fd);
+	close(ctx->memfd);
+	close(ctx->devfd);
+	free(ctx);
+}
+
+static void udmabuf_memcpy_from_device(void *dst, struct memory_buffer *src,
+				       size_t off, int n)
+{
+	struct dma_buf_sync sync = {};
+
+	sync.flags = DMA_BUF_SYNC_START;
+	ioctl(src->fd, DMA_BUF_IOCTL_SYNC, &sync);
+
+	memcpy(dst, src->buf_mem + off, n);
+
+	sync.flags = DMA_BUF_SYNC_END;
+	ioctl(src->fd, DMA_BUF_IOCTL_SYNC, &sync);
+}
+
+static struct memory_provider udmabuf_memory_provider = {
+	.alloc = udmabuf_alloc,
+	.free = udmabuf_free,
+	.memcpy_from_device = udmabuf_memcpy_from_device,
+};
+
+static struct memory_provider *provider = &udmabuf_memory_provider;
+
+static void print_nonzero_bytes(void *ptr, size_t size)
 {
 	unsigned char *p = ptr;
 	unsigned int i;
@@ -201,42 +285,7 @@ err_close:
 	return -1;
 }
 
-static void create_udmabuf(int *devfd, int *memfd, int *buf, size_t dmabuf_size)
+int do_server(struct memory_buffer *mem)
-{
-	struct udmabuf_create create;
-	int ret;
-
-	*devfd = open("/dev/udmabuf", O_RDWR);
-	if (*devfd < 0) {
-		error(70, 0,
-		      "%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\n",
-		      TEST_PREFIX);
-	}
-
-	*memfd = memfd_create("udmabuf-test", MFD_ALLOW_SEALING);
-	if (*memfd < 0)
-		error(70, 0, "%s: [skip,no-memfd]\n", TEST_PREFIX);
-
-	/* Required for udmabuf */
-	ret = fcntl(*memfd, F_ADD_SEALS, F_SEAL_SHRINK);
-	if (ret < 0)
-		error(73, 0, "%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
-
-	ret = ftruncate(*memfd, dmabuf_size);
-	if (ret == -1)
-		error(74, 0, "%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
-
-	memset(&create, 0, sizeof(create));
-
-	create.memfd = *memfd;
-	create.offset = 0;
-	create.size = dmabuf_size;
-	*buf = ioctl(*devfd, UDMABUF_CREATE, &create);
-	if (*buf < 0)
-		error(75, 0, "%s: [FAIL, create udmabuf]\n", TEST_PREFIX);
-}
-
-int do_server(void)
 {
 	char ctrl_data[sizeof(int) * 20000];
 	struct netdev_queue_id *queues;
@@ -244,23 +293,18 @@ int do_server(void)
 	struct sockaddr_in client_addr;
 	struct sockaddr_in server_sin;
 	size_t page_aligned_frags = 0;
-	int devfd, memfd, buf, ret;
 	size_t total_received = 0;
 	socklen_t client_addr_len;
 	bool is_devmem = false;
-	char *buf_mem = NULL;
+	char *tmp_mem = NULL;
 	struct ynl_sock *ys;
-	size_t dmabuf_size;
 	char iobuf[819200];
 	char buffer[256];
 	int socket_fd;
 	int client_fd;
 	size_t i = 0;
 	int opt = 1;
-
+	int ret;
-	dmabuf_size = getpagesize() * NUM_PAGES;
-
-	create_udmabuf(&devfd, &memfd, &buf, dmabuf_size);
 
 	if (reset_flow_steering())
 		error(1, 0, "Failed to reset flow steering\n");
@@ -284,13 +328,12 @@ int do_server(void)
 		queues[i].id = start_queue + i;
 	}
 
-	if (bind_rx_queue(ifindex, buf, queues, num_queues, &ys))
+	if (bind_rx_queue(ifindex, mem->fd, queues, num_queues, &ys))
 		error(1, 0, "Failed to bind\n");
 
-	buf_mem = mmap(NULL, dmabuf_size, PROT_READ | PROT_WRITE, MAP_SHARED,
+	tmp_mem = malloc(mem->size);
-		       buf, 0);
+	if (!tmp_mem)
-	if (buf_mem == MAP_FAILED)
+		error(1, ENOMEM, "malloc failed");
-		error(1, 0, "mmap()");
 
 	server_sin.sin_family = AF_INET;
 	server_sin.sin_port = htons(atoi(port));
@@ -341,7 +384,6 @@ int do_server(void)
 		struct iovec iov = { .iov_base = iobuf,
 				     .iov_len = sizeof(iobuf) };
 		struct dmabuf_cmsg *dmabuf_cmsg = NULL;
-		struct dma_buf_sync sync = { 0 };
 		struct cmsghdr *cm = NULL;
 		struct msghdr msg = { 0 };
 		struct dmabuf_token token;
@@ -410,22 +452,16 @@ int do_server(void)
 			else
 				page_aligned_frags++;
 
-			sync.flags = DMA_BUF_SYNC_READ | DMA_BUF_SYNC_START;
+			provider->memcpy_from_device(tmp_mem, mem,
-			ioctl(buf, DMA_BUF_IOCTL_SYNC, &sync);
+						     dmabuf_cmsg->frag_offset,
+						     dmabuf_cmsg->frag_size);
 
 			if (do_validation)
-				validate_buffer(
+				validate_buffer(tmp_mem,
-					((unsigned char *)buf_mem) +
+						dmabuf_cmsg->frag_size);
-						dmabuf_cmsg->frag_offset,
-					dmabuf_cmsg->frag_size);
 			else
-				print_nonzero_bytes(
+				print_nonzero_bytes(tmp_mem,
-					((unsigned char *)buf_mem) +
+						    dmabuf_cmsg->frag_size);
-						dmabuf_cmsg->frag_offset,
-					dmabuf_cmsg->frag_size);
-
-			sync.flags = DMA_BUF_SYNC_READ | DMA_BUF_SYNC_END;
-			ioctl(buf, DMA_BUF_IOCTL_SYNC, &sync);
 
 			ret = setsockopt(client_fd, SOL_SOCKET,
 					 SO_DEVMEM_DONTNEED, &token,
@@ -450,12 +486,9 @@ int do_server(void)
 
 cleanup:
 
-	munmap(buf_mem, dmabuf_size);
+	free(tmp_mem);
 	close(client_fd);
 	close(socket_fd);
-	close(buf);
-	close(memfd);
-	close(devfd);
 	ynl_sock_destroy(ys);
 
 	return 0;
@@ -464,14 +497,11 @@ cleanup:
 void run_devmem_tests(void)
 {
 	struct netdev_queue_id *queues;
-	int devfd, memfd, buf;
+	struct memory_buffer *mem;
 	struct ynl_sock *ys;
-	size_t dmabuf_size;
 	size_t i = 0;
 
-	dmabuf_size = getpagesize() * NUM_PAGES;
+	mem = provider->alloc(getpagesize() * NUM_PAGES);
-
-	create_udmabuf(&devfd, &memfd, &buf, dmabuf_size);
 
 	/* Configure RSS to divert all traffic from our devmem queues */
 	if (configure_rss())
@@ -482,7 +512,7 @@ void run_devmem_tests(void)
 	if (configure_headersplit(1))
 		error(1, 0, "Failed to configure header split\n");
 
-	if (!bind_rx_queue(ifindex, buf, queues, num_queues, &ys))
+	if (!bind_rx_queue(ifindex, mem->fd, queues, num_queues, &ys))
 		error(1, 0, "Binding empty queues array should have failed\n");
 
 	for (i = 0; i < num_queues; i++) {
@@ -495,7 +525,7 @@ void run_devmem_tests(void)
 	if (configure_headersplit(0))
 		error(1, 0, "Failed to configure header split\n");
 
-	if (!bind_rx_queue(ifindex, buf, queues, num_queues, &ys))
+	if (!bind_rx_queue(ifindex, mem->fd, queues, num_queues, &ys))
 		error(1, 0, "Configure dmabuf with header split off should have failed\n");
 
 	if (configure_headersplit(1))
@@ -508,7 +538,7 @@ void run_devmem_tests(void)
 		queues[i].id = start_queue + i;
 	}
 
-	if (bind_rx_queue(ifindex, buf, queues, num_queues, &ys))
+	if (bind_rx_queue(ifindex, mem->fd, queues, num_queues, &ys))
 		error(1, 0, "Failed to bind\n");
 
 	/* Deactivating a bound queue should not be legal */
@@ -517,11 +547,15 @@ void run_devmem_tests(void)
 
 	/* Closing the netlink socket does an implicit unbind */
 	ynl_sock_destroy(ys);
+
+	provider->free(mem);
 }
 
 int main(int argc, char *argv[])
 {
+	struct memory_buffer *mem;
 	int is_server = 0, opt;
+	int ret;
 
 	while ((opt = getopt(argc, argv, "ls:c:p:v:q:t:f:")) != -1) {
 		switch (opt) {
@@ -562,8 +596,9 @@ int main(int argc, char *argv[])
 
 	run_devmem_tests();
 
-	if (is_server)
+	mem = provider->alloc(getpagesize() * NUM_PAGES);
-		return do_server();
+	ret = is_server ? do_server(mem) : 1;
+	provider->free(mem);
 
-	return 0;
+	return ret;
 }