Subject: [PATCH 31/38] selftests/tls: test for lowat overshoot with multiple records

From: Jakub Kicinski <[email-masked]>
Date: Fri, 24 May 2019 10:34:31 -0700

[ Upstream commit 7718a855cd7ae9fc27a2aa1532ee105d52eb7634 ]

Set SO_RCVLOWAT and test it gets respected when gathering
data from multiple records.

Signed-off-by: Jakub Kicinski <[email-masked]>
Reviewed-by: Dirk van der Merwe <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 tools/testing/selftests/net/tls.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/testing/selftests/net/tls.c b/tools/testing/selftests/net/tls.c
index 47ddfc154036..01efbcd2258c 100644
--- a/tools/testing/selftests/net/tls.c
+++ b/tools/testing/selftests/net/tls.c
@@ -575,6 +575,25 @@ TEST_F(tls, recv_peek_large_buf_mult_recs)
 	EXPECT_EQ(memcmp(test_str, buf, len), 0);
 }
 
+TEST_F(tls, recv_lowat)
+{
+	char send_mem[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+	char recv_mem[20];
+	int lowat = 8;
+
+	EXPECT_EQ(send(self->fd, send_mem, 10, 0), 10);
+	EXPECT_EQ(send(self->fd, send_mem, 5, 0), 5);
+
+	memset(recv_mem, 0, 20);
+	EXPECT_EQ(setsockopt(self->cfd, SOL_SOCKET, SO_RCVLOWAT,
+			     &lowat, sizeof(lowat)), 0);
+	EXPECT_EQ(recv(self->cfd, recv_mem, 1, MSG_WAITALL), 1);
+	EXPECT_EQ(recv(self->cfd, recv_mem + 1, 6, MSG_WAITALL), 6);
+	EXPECT_EQ(recv(self->cfd, recv_mem + 7, 10, 0), 8);
+
+	EXPECT_EQ(memcmp(send_mem, recv_mem, 10), 0);
+	EXPECT_EQ(memcmp(send_mem, recv_mem + 10, 5), 0);
+}
 
 TEST_F(tls, pollin)
 {
-- 
2.20.1