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Commit 00f333e8 authored by Willem de Bruijn's avatar Willem de Bruijn Committed by David S. Miller
Browse files

selftests/net: udpgso: test small gso_size boundary conditions 



Verify that udpgso can generate segments smaller than device mtu, down
to the extreme case of 1B gso_size.

Verify that irrespective of gso_size, udpgso restricts the number of
segments it will generate per call (UDP_MAX_SEGMENTS).

Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 830669e6

tools/testing/selftests/net/udpgso.c

+75 −2
Original line number Diff line number Diff line
@@ -34,6 +34,10 @@ 
#define UDP_SEGMENT		103

#endif



#ifndef UDP_MAX_SEGMENTS

#define UDP_MAX_SEGMENTS	(1 << 6UL)

#endif



#define CONST_MTU_TEST	1500



#define CONST_HDRLEN_V4		(sizeof(struct iphdr) + sizeof(struct udphdr))
@@ -135,6 +139,38 @@ struct testcase testcases_v4[] = { 
		.gso_len = CONST_MSS_V4,

		.tfail = true,

	},

	{

		/* send a single 1B MSS: will fail, see single MSS above */

		.tlen = 1,

		.gso_len = 1,

		.tfail = true,

		.r_num_mss = 1,

	},

	{

		/* send 2 1B segments */

		.tlen = 2,

		.gso_len = 1,

		.r_num_mss = 2,

	},

	{

		/* send 2B + 2B + 1B segments */

		.tlen = 5,

		.gso_len = 2,

		.r_num_mss = 2,

		.r_len_last = 1,

	},

	{

		/* send max number of min sized segments */

		.tlen = UDP_MAX_SEGMENTS - CONST_HDRLEN_V4,

		.gso_len = 1,

		.r_num_mss = UDP_MAX_SEGMENTS - CONST_HDRLEN_V4,

	},

	{

		/* send max number + 1 of min sized segments: fail */

		.tlen = UDP_MAX_SEGMENTS - CONST_HDRLEN_V4 + 1,

		.gso_len = 1,

		.tfail = true,

	},

	{

		/* EOL */

	}
@@ -210,6 +246,38 @@ struct testcase testcases_v6[] = { 
		.gso_len = CONST_MSS_V6,

		.tfail = true,

	},

	{

		/* send a single 1B MSS: will fail, see single MSS above */

		.tlen = 1,

		.gso_len = 1,

		.tfail = true,

		.r_num_mss = 1,

	},

	{

		/* send 2 1B segments */

		.tlen = 2,

		.gso_len = 1,

		.r_num_mss = 2,

	},

	{

		/* send 2B + 2B + 1B segments */

		.tlen = 5,

		.gso_len = 2,

		.r_num_mss = 2,

		.r_len_last = 1,

	},

	{

		/* send max number of min sized segments */

		.tlen = UDP_MAX_SEGMENTS - CONST_HDRLEN_V6,

		.gso_len = 1,

		.r_num_mss = UDP_MAX_SEGMENTS - CONST_HDRLEN_V6,

	},

	{

		/* send max number + 1 of min sized segments: fail */

		.tlen = UDP_MAX_SEGMENTS - CONST_HDRLEN_V6 + 1,

		.gso_len = 1,

		.tfail = true,

	},

	{

		/* EOL */

	}
@@ -375,7 +443,8 @@ static bool __send_one(int fd, struct msghdr *msg, int flags) 
	int ret;



	ret = sendmsg(fd, msg, flags);

	if (ret == -1 && (errno == EMSGSIZE || errno == ENOMEM))

	if (ret == -1 &&

	    (errno == EMSGSIZE || errno == ENOMEM || errno == EINVAL))

		return false;

	if (ret == -1)

		error(1, errno, "sendmsg");
@@ -466,8 +535,12 @@ static void run_one(struct testcase *test, int fdt, int fdr, 
	if (!sent)

		return;



	if (test->gso_len)

		mss = test->gso_len;

	else

		mss = addr->sa_family == AF_INET ? CONST_MSS_V4 : CONST_MSS_V6;





	/* Recv all full MSS datagrams */

	for (i = 0; i < test->r_num_mss; i++) {

		ret = recv_one(fdr, 0);