Date:   Fri, 21 Oct 2016 13:08:01 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     davem@...emloft.net, alexei.starovoitov@...il.com,
        edumazet@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 2/2] reuseport, bpf: add test case for
 bpf_get_numa_node_id

Fri, Oct 21, 2016 at 12:46:34PM CEST, daniel@...earbox.net wrote:
>The test case is very similar to reuseport_bpf_cpu, only that here
>we select socket members based on current numa node id.
>
>  # numactl -H
>  available: 2 nodes (0-1)
>  node 0 cpus: 0 1 2 3 4 5 12 13 14 15 16 17
>  node 0 size: 128867 MB
>  node 0 free: 120080 MB
>  node 1 cpus: 6 7 8 9 10 11 18 19 20 21 22 23
>  node 1 size: 96765 MB
>  node 1 free: 87504 MB
>  node distances:
>  node   0   1
>    0:  10  20
>    1:  20  10
>
>  # ./reuseport_bpf_numa
>  ---- IPv4 UDP ----
>  send node 0, receive socket 0
>  send node 1, receive socket 1
>  send node 1, receive socket 1
>  send node 0, receive socket 0
>  ---- IPv6 UDP ----
>  send node 0, receive socket 0
>  send node 1, receive socket 1
>  send node 1, receive socket 1
>  send node 0, receive socket 0
>  ---- IPv4 TCP ----
>  send node 0, receive socket 0
>  send node 1, receive socket 1
>  send node 1, receive socket 1
>  send node 0, receive socket 0
>  ---- IPv6 TCP ----
>  send node 0, receive socket 0
>  send node 1, receive socket 1
>  send node 1, receive socket 1
>  send node 0, receive socket 0
>  SUCCESS
>
>Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
>Acked-by: Alexei Starovoitov <ast@...nel.org>
>---
> tools/testing/selftests/net/.gitignore           |   1 +
> tools/testing/selftests/net/Makefile             |  11 +-
> tools/testing/selftests/net/reuseport_bpf_numa.c | 255 +++++++++++++++++++++++
> 3 files changed, 263 insertions(+), 4 deletions(-)
> create mode 100644 tools/testing/selftests/net/reuseport_bpf_numa.c
>
>diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore
>index 0840684..afe109e 100644
>--- a/tools/testing/selftests/net/.gitignore
>+++ b/tools/testing/selftests/net/.gitignore
>@@ -3,4 +3,5 @@ psock_fanout
> psock_tpacket
> reuseport_bpf
> reuseport_bpf_cpu
>+reuseport_bpf_numa
> reuseport_dualstack
>diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
>index 0e53407..e24e4c8 100644
>--- a/tools/testing/selftests/net/Makefile
>+++ b/tools/testing/selftests/net/Makefile
>@@ -1,14 +1,17 @@
> # Makefile for net selftests
> 
>-CFLAGS = -Wall -O2 -g
>-
>+CFLAGS =  -Wall -Wl,--no-as-needed -O2 -g

           ^ why the extra space?


> CFLAGS += -I../../../../usr/include/
> 
>-NET_PROGS = socket psock_fanout psock_tpacket reuseport_bpf reuseport_bpf_cpu reuseport_dualstack
>+NET_PROGS =  socket

              ^ yet again. Sorry for nitpicking :)


>+NET_PROGS += psock_fanout psock_tpacket
>+NET_PROGS += reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
>+NET_PROGS += reuseport_dualstack
> 
> all: $(NET_PROGS)
>+reuseport_bpf_numa: LDFLAGS += -lnuma
> %: %.c
>-	$(CC) $(CFLAGS) -o $@ $^
>+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
> 
> TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh
> TEST_FILES := $(NET_PROGS)
>diff --git a/tools/testing/selftests/net/reuseport_bpf_numa.c b/tools/testing/selftests/net/reuseport_bpf_numa.c
>new file mode 100644
>index 0000000..6f20bc9
>--- /dev/null
>+++ b/tools/testing/selftests/net/reuseport_bpf_numa.c
>@@ -0,0 +1,255 @@
>+/*
>+ * Test functionality of BPF filters with SO_REUSEPORT. Same test as
>+ * in reuseport_bpf_cpu, only as one socket per NUMA node.
>+ */
>+
>+#define _GNU_SOURCE
>+
>+#include <arpa/inet.h>
>+#include <errno.h>
>+#include <error.h>
>+#include <linux/filter.h>
>+#include <linux/bpf.h>
>+#include <linux/in.h>
>+#include <linux/unistd.h>
>+#include <sched.h>
>+#include <stdio.h>
>+#include <stdlib.h>
>+#include <string.h>
>+#include <sys/epoll.h>
>+#include <sys/types.h>
>+#include <sys/socket.h>
>+#include <unistd.h>
>+#include <numa.h>
>+
>+static const int PORT = 8888;
>+
>+static void build_rcv_group(int *rcv_fd, size_t len, int family, int proto)
>+{
>+	struct sockaddr_storage addr;
>+	struct sockaddr_in  *addr4;
>+	struct sockaddr_in6 *addr6;
>+	size_t i;
>+	int opt;
>+
>+	switch (family) {
>+	case AF_INET:
>+		addr4 = (struct sockaddr_in *)&addr;
>+		addr4->sin_family = AF_INET;
>+		addr4->sin_addr.s_addr = htonl(INADDR_ANY);
>+		addr4->sin_port = htons(PORT);
>+		break;
>+	case AF_INET6:
>+		addr6 = (struct sockaddr_in6 *)&addr;
>+		addr6->sin6_family = AF_INET6;
>+		addr6->sin6_addr = in6addr_any;
>+		addr6->sin6_port = htons(PORT);
>+		break;
>+	default:
>+		error(1, 0, "Unsupported family %d", family);
>+	}
>+
>+	for (i = 0; i < len; ++i) {
>+		rcv_fd[i] = socket(family, proto, 0);
>+		if (rcv_fd[i] < 0)
>+			error(1, errno, "failed to create receive socket");
>+
>+		opt = 1;
>+		if (setsockopt(rcv_fd[i], SOL_SOCKET, SO_REUSEPORT, &opt,
>+			       sizeof(opt)))
>+			error(1, errno, "failed to set SO_REUSEPORT");
>+
>+		if (bind(rcv_fd[i], (struct sockaddr *)&addr, sizeof(addr)))
>+			error(1, errno, "failed to bind receive socket");
>+
>+		if (proto == SOCK_STREAM && listen(rcv_fd[i], len * 10))
>+			error(1, errno, "failed to listen on receive port");
>+	}
>+}
>+
>+static void attach_bpf(int fd)
>+{
>+	static char bpf_log_buf[65536];
>+	static const char bpf_license[] = "";
>+
>+	int bpf_fd;
>+	const struct bpf_insn prog[] = {
>+		/* R0 = bpf_get_numa_node_id() */
>+		{ BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_numa_node_id },
>+		/* return R0 */
>+		{ BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
>+	};
>+	union bpf_attr attr;
>+
>+	memset(&attr, 0, sizeof(attr));
>+	attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
>+	attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
>+	attr.insns = (unsigned long) &prog;
>+	attr.license = (unsigned long) &bpf_license;
>+	attr.log_buf = (unsigned long) &bpf_log_buf;
>+	attr.log_size = sizeof(bpf_log_buf);
>+	attr.log_level = 1;
>+
>+	bpf_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
>+	if (bpf_fd < 0)
>+		error(1, errno, "ebpf error. log:\n%s\n", bpf_log_buf);
>+
>+	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &bpf_fd,
>+			sizeof(bpf_fd)))
>+		error(1, errno, "failed to set SO_ATTACH_REUSEPORT_EBPF");
>+
>+	close(bpf_fd);
>+}
>+
>+static void send_from_node(int node_id, int family, int proto)
>+{
>+	struct sockaddr_storage saddr, daddr;
>+	struct sockaddr_in  *saddr4, *daddr4;
>+	struct sockaddr_in6 *saddr6, *daddr6;
>+	int fd;
>+
>+	switch (family) {
>+	case AF_INET:
>+		saddr4 = (struct sockaddr_in *)&saddr;
>+		saddr4->sin_family = AF_INET;
>+		saddr4->sin_addr.s_addr = htonl(INADDR_ANY);
>+		saddr4->sin_port = 0;
>+
>+		daddr4 = (struct sockaddr_in *)&daddr;
>+		daddr4->sin_family = AF_INET;
>+		daddr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
>+		daddr4->sin_port = htons(PORT);
>+		break;
>+	case AF_INET6:
>+		saddr6 = (struct sockaddr_in6 *)&saddr;
>+		saddr6->sin6_family = AF_INET6;
>+		saddr6->sin6_addr = in6addr_any;
>+		saddr6->sin6_port = 0;
>+
>+		daddr6 = (struct sockaddr_in6 *)&daddr;
>+		daddr6->sin6_family = AF_INET6;
>+		daddr6->sin6_addr = in6addr_loopback;
>+		daddr6->sin6_port = htons(PORT);
>+		break;
>+	default:
>+		error(1, 0, "Unsupported family %d", family);
>+	}
>+
>+	if (numa_run_on_node(node_id) < 0)
>+		error(1, errno, "failed to pin to node");
>+
>+	fd = socket(family, proto, 0);
>+	if (fd < 0)
>+		error(1, errno, "failed to create send socket");
>+
>+	if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))
>+		error(1, errno, "failed to bind send socket");
>+
>+	if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))
>+		error(1, errno, "failed to connect send socket");
>+
>+	if (send(fd, "a", 1, 0) < 0)
>+		error(1, errno, "failed to send message");
>+
>+	close(fd);
>+}
>+
>+static
>+void receive_on_node(int *rcv_fd, int len, int epfd, int node_id, int proto)
>+{
>+	struct epoll_event ev;
>+	int i, fd;
>+	char buf[8];
>+
>+	i = epoll_wait(epfd, &ev, 1, -1);
>+	if (i < 0)
>+		error(1, errno, "epoll_wait failed");
>+
>+	if (proto == SOCK_STREAM) {
>+		fd = accept(ev.data.fd, NULL, NULL);
>+		if (fd < 0)
>+			error(1, errno, "failed to accept");
>+		i = recv(fd, buf, sizeof(buf), 0);
>+		close(fd);
>+	} else {
>+		i = recv(ev.data.fd, buf, sizeof(buf), 0);
>+	}
>+
>+	if (i < 0)
>+		error(1, errno, "failed to recv");
>+
>+	for (i = 0; i < len; ++i)
>+		if (ev.data.fd == rcv_fd[i])
>+			break;
>+	if (i == len)
>+		error(1, 0, "failed to find socket");
>+	fprintf(stderr, "send node %d, receive socket %d\n", node_id, i);
>+	if (node_id != i)
>+		error(1, 0, "node id/receive socket mismatch");
>+}
>+
>+static void test(int *rcv_fd, int len, int family, int proto)
>+{
>+	struct epoll_event ev;
>+	int epfd, node;
>+
>+	build_rcv_group(rcv_fd, len, family, proto);
>+	attach_bpf(rcv_fd[0]);
>+
>+	epfd = epoll_create(1);
>+	if (epfd < 0)
>+		error(1, errno, "failed to create epoll");
>+	for (node = 0; node < len; ++node) {
>+		ev.events = EPOLLIN;
>+		ev.data.fd = rcv_fd[node];
>+		if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fd[node], &ev))
>+			error(1, errno, "failed to register sock epoll");
>+	}
>+
>+	/* Forward iterate */
>+	for (node = 0; node < len; ++node) {
>+		send_from_node(node, family, proto);
>+		receive_on_node(rcv_fd, len, epfd, node, proto);
>+	}
>+
>+	/* Reverse iterate */
>+	for (node = len - 1; node >= 0; --node) {
>+		send_from_node(node, family, proto);
>+		receive_on_node(rcv_fd, len, epfd, node, proto);
>+	}
>+
>+	close(epfd);
>+	for (node = 0; node < len; ++node)
>+		close(rcv_fd[node]);
>+}
>+
>+int main(void)
>+{
>+	int *rcv_fd, nodes;
>+
>+	if (numa_available() < 0)
>+		error(1, errno, "no numa api support");
>+
>+	nodes = numa_max_node() + 1;
>+
>+	rcv_fd = calloc(nodes, sizeof(int));
>+	if (!rcv_fd)
>+		error(1, 0, "failed to allocate array");
>+
>+	fprintf(stderr, "---- IPv4 UDP ----\n");
>+	test(rcv_fd, nodes, AF_INET, SOCK_DGRAM);
>+
>+	fprintf(stderr, "---- IPv6 UDP ----\n");
>+	test(rcv_fd, nodes, AF_INET6, SOCK_DGRAM);
>+
>+	fprintf(stderr, "---- IPv4 TCP ----\n");
>+	test(rcv_fd, nodes, AF_INET, SOCK_STREAM);
>+
>+	fprintf(stderr, "---- IPv6 TCP ----\n");
>+	test(rcv_fd, nodes, AF_INET6, SOCK_STREAM);
>+
>+	free(rcv_fd);
>+
>+	fprintf(stderr, "SUCCESS\n");
>+	return 0;
>+}
>-- 
>1.9.3
>

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