selftests: net: add PF_PACKET TPACKET v1/v2/v3 selftests

This patch adds a simple test case that probes the packet socket's
TPACKET_V1, TPACKET_V2 and TPACKET_V3 behavior regarding mmap(2)'ed
I/O for a small burst of 100 packets. The test currently runs for ...

  TPACKET_V1: RX_RING, TX_RING
  TPACKET_V2: RX_RING, TX_RING
  TPACKET_V3: RX_RING

... and will output on success:

  test: TPACKET_V1 with PACKET_RX_RING .................... 100 pkts (9600 bytes)
  test: TPACKET_V1 with PACKET_TX_RING .................... 100 pkts (9600 bytes)
  test: TPACKET_V2 with PACKET_RX_RING .................... 100 pkts (9600 bytes)
  test: TPACKET_V2 with PACKET_TX_RING .................... 100 pkts (9600 bytes)
  test: TPACKET_V3 with PACKET_RX_RING .................... 100 pkts (9600 bytes)
  OK. All tests passed

Reusable parts of psock_fanout.c have been put into a psock_lib.h
file for common usage. Test case successfully tested on x86_64.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/Makefile

 # Makefile for net selftests
 
 CC = $(CROSS_COMPILE)gcc
-CFLAGS = -Wall
+CFLAGS = -Wall -O2 -g
 
 CFLAGS += -I../../../../usr/include/
 
-NET_PROGS = socket psock_fanout
+NET_PROGS = socket psock_fanout psock_tpacket
 
 all: $(NET_PROGS)
 %: %.c

tools/testing/selftests/net/psock_fanout.c

@@ -61,91 +61,9 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#define DATA_LEN			100
-#define DATA_CHAR			'a'
-#define RING_NUM_FRAMES			20
-#define PORT_BASE			8000
-
-static void pair_udp_open(int fds[], uint16_t port)
-{
-	struct sockaddr_in saddr, daddr;
-
-	fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
-	fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
-	if (fds[0] == -1 || fds[1] == -1) {
-		fprintf(stderr, "ERROR: socket dgram\n");
-		exit(1);
-	}
-
-	memset(&saddr, 0, sizeof(saddr));
-	saddr.sin_family = AF_INET;
-	saddr.sin_port = htons(port);
-	saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
-
-	memset(&daddr, 0, sizeof(daddr));
-	daddr.sin_family = AF_INET;
-	daddr.sin_port = htons(port + 1);
-	daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+#include "psock_lib.h"
 
-	/* must bind both to get consistent hash result */
-	if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
-		perror("bind");
-		exit(1);
-	}
-	if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
-		perror("bind");
-		exit(1);
-	}
-	if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
-		perror("connect");
-		exit(1);
-	}
-}
-
-static void pair_udp_send(int fds[], int num)
-{
-	char buf[DATA_LEN], rbuf[DATA_LEN];
-
-	memset(buf, DATA_CHAR, sizeof(buf));
-	while (num--) {
-		/* Should really handle EINTR and EAGAIN */
-		if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
-			fprintf(stderr, "ERROR: send failed left=%d\n", num);
-			exit(1);
-		}
-		if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
-			fprintf(stderr, "ERROR: recv failed left=%d\n", num);
-			exit(1);
-		}
-		if (memcmp(buf, rbuf, sizeof(buf))) {
-			fprintf(stderr, "ERROR: data failed left=%d\n", num);
-			exit(1);
-		}
-	}
-}
-
-static void sock_fanout_setfilter(int fd)
-{
-	struct sock_filter bpf_filter[] = {
-		{ 0x80, 0, 0, 0x00000000 },  /* LD  pktlen		      */
-		{ 0x35, 0, 5, DATA_LEN   },  /* JGE DATA_LEN  [f goto nomatch]*/
-		{ 0x30, 0, 0, 0x00000050 },  /* LD  ip[80]		      */
-		{ 0x15, 0, 3, DATA_CHAR  },  /* JEQ DATA_CHAR [f goto nomatch]*/
-		{ 0x30, 0, 0, 0x00000051 },  /* LD  ip[81]		      */
-		{ 0x15, 0, 1, DATA_CHAR  },  /* JEQ DATA_CHAR [f goto nomatch]*/
-		{ 0x6, 0, 0, 0x00000060  },  /* RET match	              */
-/* nomatch */	{ 0x6, 0, 0, 0x00000000  },  /* RET no match		      */
-	};
-	struct sock_fprog bpf_prog;
-
-	bpf_prog.filter = bpf_filter;
-	bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
-	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
-		       sizeof(bpf_prog))) {
-		perror("setsockopt SO_ATTACH_FILTER");
-		exit(1);
-	}
-}
+#define RING_NUM_FRAMES			20
 
 /* Open a socket in a given fanout mode.
  * @return -1 if mode is bad, a valid socket otherwise */
@@ -169,7 +87,7 @@ static int sock_fanout_open(uint16_t typeflags, int num_packets)
 		return -1;
 	}
 
-	sock_fanout_setfilter(fd);
+	pair_udp_setfilter(fd);
 	return fd;
 }
 

tools/testing/selftests/net/psock_lib.h

+/*
+ * Copyright 2013 Google Inc.
+ * Author: Willem de Bruijn <willemb@google.com>
+ *         Daniel Borkmann <dborkman@redhat.com>
+ *
+ * License (GPLv2):
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef PSOCK_LIB_H
+#define PSOCK_LIB_H
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+
+#define DATA_LEN			100
+#define DATA_CHAR			'a'
+
+#define PORT_BASE			8000
+
+#ifndef __maybe_unused
+# define __maybe_unused		__attribute__ ((__unused__))
+#endif
+
+static __maybe_unused void pair_udp_setfilter(int fd)
+{
+	struct sock_filter bpf_filter[] = {
+		{ 0x80, 0, 0, 0x00000000 },  /* LD  pktlen		      */
+		{ 0x35, 0, 5, DATA_LEN   },  /* JGE DATA_LEN  [f goto nomatch]*/
+		{ 0x30, 0, 0, 0x00000050 },  /* LD  ip[80]		      */
+		{ 0x15, 0, 3, DATA_CHAR  },  /* JEQ DATA_CHAR [f goto nomatch]*/
+		{ 0x30, 0, 0, 0x00000051 },  /* LD  ip[81]		      */
+		{ 0x15, 0, 1, DATA_CHAR  },  /* JEQ DATA_CHAR [f goto nomatch]*/
+		{ 0x06, 0, 0, 0x00000060 },  /* RET match	              */
+		{ 0x06, 0, 0, 0x00000000 },  /* RET no match		      */
+	};
+	struct sock_fprog bpf_prog;
+
+	bpf_prog.filter = bpf_filter;
+	bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
+	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
+		       sizeof(bpf_prog))) {
+		perror("setsockopt SO_ATTACH_FILTER");
+		exit(1);
+	}
+}
+
+static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
+{
+	struct sockaddr_in saddr, daddr;
+
+	fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
+	fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
+	if (fds[0] == -1 || fds[1] == -1) {
+		fprintf(stderr, "ERROR: socket dgram\n");
+		exit(1);
+	}
+
+	memset(&saddr, 0, sizeof(saddr));
+	saddr.sin_family = AF_INET;
+	saddr.sin_port = htons(port);
+	saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+	memset(&daddr, 0, sizeof(daddr));
+	daddr.sin_family = AF_INET;
+	daddr.sin_port = htons(port + 1);
+	daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+	/* must bind both to get consistent hash result */
+	if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
+		perror("bind");
+		exit(1);
+	}
+	if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
+		perror("bind");
+		exit(1);
+	}
+	if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
+		perror("connect");
+		exit(1);
+	}
+}
+
+static __maybe_unused void pair_udp_send(int fds[], int num)
+{
+	char buf[DATA_LEN], rbuf[DATA_LEN];
+
+	memset(buf, DATA_CHAR, sizeof(buf));
+	while (num--) {
+		/* Should really handle EINTR and EAGAIN */
+		if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
+			fprintf(stderr, "ERROR: send failed left=%d\n", num);
+			exit(1);
+		}
+		if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
+			fprintf(stderr, "ERROR: recv failed left=%d\n", num);
+			exit(1);
+		}
+		if (memcmp(buf, rbuf, sizeof(buf))) {
+			fprintf(stderr, "ERROR: data failed left=%d\n", num);
+			exit(1);
+		}
+	}
+}
+
+static __maybe_unused void pair_udp_close(int fds[])
+{
+	close(fds[0]);
+	close(fds[1]);
+}
+
+#endif /* PSOCK_LIB_H */

tools/testing/selftests/net/run_afpackettests

@@ -14,3 +14,13 @@ if [ $? -ne 0 ]; then
 else
 	echo "[PASS]"
 fi
+
+echo "--------------------"
+echo "running psock_tpacket test"
+echo "--------------------"
+./psock_tpacket
+if [ $? -ne 0 ]; then
+	echo "[FAIL]"
+else
+	echo "[PASS]"
+fi