Add io_uring_peek_batch_cqe()

io_uring_peek_batch_cqe(), get multiple cqe from the queue at once.
Returns the number of cqe gotten.

test/cq-peek-batch.c: tests io_uring_peek_batch_cqe()

Signed-off-by: James Rouzier <rouzier@gmail.com>

2 files changed, 99 insertions, 2 deletions

diff --git a/test/Makefile b/test/Makefile
index 65dbb8c..4710b30 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -6,7 +6,7 @@ all_targets += poll poll-cancel ring-leak fsync io_uring_setup io_uring_register
 	       io_uring_enter nop sq-full cq-full 35fa71a030ca-test \
 		917257daa0fe-test b19062a56726-test eeed8b54e0df-test link \
 		send_recvmsg a4c0b3decb33-test 500f9fbadef8-test timeout \
-		sq-space_left stdout cq-ready
+		sq-space_left stdout cq-ready cq-peek-batch
 
 include ../Makefile.quiet
 
@@ -19,7 +19,8 @@ test_srcs := poll.c poll-cancel.c ring-leak.c fsync.c io_uring_setup.c \
 	io_uring_register.c io_uring_enter.c nop.c sq-full.c cq-full.c \
 	35fa71a030ca-test.c 917257daa0fe-test.c b19062a56726-test.c \
 	eeed8b54e0df-test.c link.c send_recvmsg.c a4c0b3decb33-test.c \
-	500f9fbadef8-test.c timeout.c sq-space_left.c stdout.c cq-ready.c
+	500f9fbadef8-test.c timeout.c sq-space_left.c stdout.c cq-ready.c\
+	cq-peek-batch.c
 
 test_objs := $(patsubst %.c,%.ol,$(test_srcs))
 
diff --git a/test/cq-peek-batch.c b/test/cq-peek-batch.c
new file mode 100644
index 0000000..e0a765e
--- /dev/null
+++ b/test/cq-peek-batch.c
@@ -0,0 +1,96 @@
+/*
+ * Description: test CQ peek-batch
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "liburing.h"
+
+static int queue_n_nops(struct io_uring *ring, int n, int offset)
+{
+	struct io_uring_sqe *sqe;
+	int i, ret;
+
+	for (i = 0; i < n; i++) {
+		sqe = io_uring_get_sqe(ring);
+		if (!sqe) {
+			printf("get sqe failed\n");
+			goto err;
+		}
+
+		io_uring_prep_nop(sqe);
+		sqe->user_data = i + offset;
+	}
+
+	ret = io_uring_submit(ring);
+	if (ret < n) {
+		printf("Submitted only %d\n", ret);
+		goto err;
+	} else if (ret < 0) {
+		printf("sqe submit failed: %d\n", ret);
+		goto err;
+	}
+
+	return 0;
+err:
+	return 1;
+}
+
+#define CHECK_BATCH(ring, got, cqes, count, expected) do {\
+	got = io_uring_peek_batch_cqe((ring), cqes, count);\
+	if (got != expected) {\
+		printf("Got %d CQs, expected %d\n", got, expected);\
+		goto err;\
+	}\
+} while(0)
+
+int main(int argc, char *argv[])
+{
+	struct io_uring_cqe *cqes[8];
+	struct io_uring ring;
+	int ret, i;
+	unsigned got;
+
+	ret = io_uring_queue_init(4, &ring, 0);
+	if (ret) {
+		printf("ring setup failed\n");
+		return 1;
+
+	}
+
+	CHECK_BATCH(&ring, got, cqes, 4, 0);
+	if (queue_n_nops(&ring, 4, 0))
+		goto err;
+
+	CHECK_BATCH(&ring, got, cqes, 4, 4);
+	for (i=0;i<4;i++) {
+		if (i != cqes[i]->user_data) {
+			printf("Got user_data %lld, expected %d\n", cqes[i]->user_data, i);
+			goto err;
+		}
+	}
+
+	if (queue_n_nops(&ring, 4, 4))
+		goto err;
+
+	io_uring_cq_advance(&ring, 4);
+	CHECK_BATCH(&ring, got, cqes, 4, 4);
+	for (i=0;i<4;i++) {
+		if (i + 4 != cqes[i]->user_data) {
+			printf("Got user_data %lld, expected %d\n", cqes[i]->user_data, i + 4);
+			goto err;
+		}
+	}
+
+	io_uring_cq_advance(&ring, 8);
+	io_uring_queue_exit(&ring);
+	return 0;
+err:
+	io_uring_queue_exit(&ring);
+	return 1;
+}