tools/testing/selftests/net/io_uring_zerocopy_tx.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/net/io_uring_zerocopy_tx.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/io_uring_zerocopy_tx.c
Extension
.c
Size
7627 bytes
Lines
321
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (mode == MODE_NONZC) {
				io_uring_prep_send(sqe, fd, payload,
						   cfg_payload_len, msg_flags);
				sqe->user_data = NONZC_TAG;
			} else {
				io_uring_prep_sendzc(sqe, fd, payload,
						     cfg_payload_len,
						     msg_flags, zc_flags);
				if (mode == MODE_ZC_FIXED) {
					sqe->ioprio |= IORING_RECVSEND_FIXED_BUF;
					sqe->buf_index = buf_idx;
				}
				sqe->user_data = ZC_TAG;
			}
		}

		ret = io_uring_submit(&ring);
		if (ret != cfg_nr_reqs)
			error(1, -ret, "submit");

		if (cfg_cork)
			do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 0);
		for (i = 0; i < cfg_nr_reqs; i++) {
			ret = io_uring_wait_cqe(&ring, &cqe);
			if (ret)
				error(1, -ret, "wait cqe");

			if (cqe->user_data != NONZC_TAG &&
			    cqe->user_data != ZC_TAG)
				error(1, EINVAL, "invalid cqe->user_data");

			if (cqe->flags & IORING_CQE_F_NOTIF) {
				if (cqe->flags & IORING_CQE_F_MORE)
					error(1, EINVAL, "invalid notif flags");
				if (compl_cqes <= 0)
					error(1, EINVAL, "notification mismatch");
				compl_cqes--;
				i--;
				io_uring_cqe_seen(&ring);
				continue;
			}
			if (cqe->flags & IORING_CQE_F_MORE) {
				if (cqe->user_data != ZC_TAG)
					error(1, -cqe->res, "unexpected F_MORE");
				compl_cqes++;
			}
			if (cqe->res >= 0) {
				packets++;
				bytes += cqe->res;
			} else if (cqe->res != -EAGAIN) {
				error(1, -cqe->res, "send failed");
			}
			io_uring_cqe_seen(&ring);
		}
	} while (gettimeofday_ms() < tstop);

	while (compl_cqes) {
		ret = io_uring_wait_cqe(&ring, &cqe);
		if (ret)
			error(1, -ret, "wait cqe");
		if (cqe->flags & IORING_CQE_F_MORE)
			error(1, EINVAL, "invalid notif flags");
		if (!(cqe->flags & IORING_CQE_F_NOTIF))
			error(1, EINVAL, "missing notif flag");

		io_uring_cqe_seen(&ring);
		compl_cqes--;
	}

	fprintf(stderr, "tx=%lu (MB=%lu), tx/s=%lu (MB/s=%lu)\n",
			packets, bytes >> 20,
			packets / (cfg_runtime_ms / 1000),
			(bytes >> 20) / (cfg_runtime_ms / 1000));

	if (close(fd))
		error(1, errno, "close");
}

static void do_test(int domain, int type, int protocol)
{
	int i;

	for (i = 0; i < IP_MAXPACKET; i++)
		payload[i] = 'a' + (i % 26);
	do_tx(domain, type, protocol);
}

static void usage(const char *filepath)
{
	error(1, 0, "Usage: %s (-4|-6) (udp|tcp) -D<dst_ip> [-s<payload size>] "

Annotation

Implementation Notes