From 23a9072e3af0d9538e25837fb2b56bb94e4a8e67 Mon Sep 17 00:00:00 2001 From: Willem de Bruijn Date: Tue, 19 Mar 2013 20:42:44 +0000 Subject: [PATCH] net: fix psock_fanout selftest hash collision Fix flaky results with PACKET_FANOUT_HASH depending on whether the two flows hash into the same packet socket or not. Also adds tests for PACKET_FANOUT_LB and PACKET_FANOUT_CPU and replaces the counting method with a packet ring. Signed-off-by: Willem de Bruijn Signed-off-by: David S. Miller --- .../selftests/net-afpacket/psock_fanout.c | 160 +++++++++++++----- 1 file changed, 120 insertions(+), 40 deletions(-) diff --git a/tools/testing/selftests/net-afpacket/psock_fanout.c b/tools/testing/selftests/net-afpacket/psock_fanout.c index af9b0196b0be..f765f09931bd 100644 --- a/tools/testing/selftests/net-afpacket/psock_fanout.c +++ b/tools/testing/selftests/net-afpacket/psock_fanout.c @@ -16,11 +16,11 @@ * The test currently runs for * - PACKET_FANOUT_HASH * - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER + * - PACKET_FANOUT_LB + * - PACKET_FANOUT_CPU * - PACKET_FANOUT_ROLLOVER * * Todo: - * - datapath: PACKET_FANOUT_LB - * - datapath: PACKET_FANOUT_CPU * - functionality: PACKET_FANOUT_FLAG_DEFRAG * * License (GPLv2): @@ -39,18 +39,23 @@ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. */ +#define _GNU_SOURCE /* for sched_setaffinity */ + #include #include +#include #include #include #include #include #include -#include +#include +#include #include #include #include #include +#include #include #include #include @@ -58,6 +63,8 @@ #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) { @@ -162,37 +169,55 @@ static int sock_fanout_open(uint16_t typeflags, int num_packets) return -1; } - val = sizeof(struct iphdr) + sizeof(struct udphdr) + DATA_LEN; - val *= num_packets; - /* hack: apparently, the above calculation is too small (TODO: fix) */ - val *= 3; - if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val))) { - perror("setsockopt SO_RCVBUF"); - exit(1); - } - sock_fanout_setfilter(fd); return fd; } -static void sock_fanout_read(int fds[], const int expect[]) +static char *sock_fanout_open_ring(int fd) { - struct tpacket_stats stats; - socklen_t ssize; - int ret[2]; + struct tpacket_req req = { + .tp_block_size = getpagesize(), + .tp_frame_size = getpagesize(), + .tp_block_nr = RING_NUM_FRAMES, + .tp_frame_nr = RING_NUM_FRAMES, + }; + char *ring; - ssize = sizeof(stats); - if (getsockopt(fds[0], SOL_PACKET, PACKET_STATISTICS, &stats, &ssize)) { - perror("getsockopt statistics 0"); + if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req, + sizeof(req))) { + perror("packetsock ring setsockopt"); exit(1); } - ret[0] = stats.tp_packets - stats.tp_drops; - ssize = sizeof(stats); - if (getsockopt(fds[1], SOL_PACKET, PACKET_STATISTICS, &stats, &ssize)) { - perror("getsockopt statistics 1"); + + ring = mmap(0, req.tp_block_size * req.tp_block_nr, + PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + if (!ring) { + fprintf(stderr, "packetsock ring mmap\n"); exit(1); } - ret[1] = stats.tp_packets - stats.tp_drops; + + return ring; +} + +static int sock_fanout_read_ring(int fd, void *ring) +{ + struct tpacket_hdr *header = ring; + int count = 0; + + while (header->tp_status & TP_STATUS_USER && count < RING_NUM_FRAMES) { + count++; + header = ring + (count * getpagesize()); + } + + return count; +} + +static int sock_fanout_read(int fds[], char *rings[], const int expect[]) +{ + int ret[2]; + + ret[0] = sock_fanout_read_ring(fds[0], rings[0]); + ret[1] = sock_fanout_read_ring(fds[1], rings[1]); fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n", ret[0], ret[1], expect[0], expect[1]); @@ -200,8 +225,10 @@ static void sock_fanout_read(int fds[], const int expect[]) if ((!(ret[0] == expect[0] && ret[1] == expect[1])) && (!(ret[0] == expect[1] && ret[1] == expect[0]))) { fprintf(stderr, "ERROR: incorrect queue lengths\n"); - exit(1); + return 1; } + + return 0; } /* Test illegal mode + flag combination */ @@ -253,11 +280,12 @@ static void test_control_group(void) } } -static void test_datapath(uint16_t typeflags, - const int expect1[], const int expect2[]) +static int test_datapath(uint16_t typeflags, int port_off, + const int expect1[], const int expect2[]) { const int expect0[] = { 0, 0 }; - int fds[2], fds_udp[2][2]; + char *rings[2]; + int fds[2], fds_udp[2][2], ret; fprintf(stderr, "test: datapath 0x%hx\n", typeflags); @@ -267,41 +295,93 @@ static void test_datapath(uint16_t typeflags, fprintf(stderr, "ERROR: failed open\n"); exit(1); } - pair_udp_open(fds_udp[0], 8000); - pair_udp_open(fds_udp[1], 8002); - sock_fanout_read(fds, expect0); + rings[0] = sock_fanout_open_ring(fds[0]); + rings[1] = sock_fanout_open_ring(fds[1]); + pair_udp_open(fds_udp[0], PORT_BASE); + pair_udp_open(fds_udp[1], PORT_BASE + port_off); + sock_fanout_read(fds, rings, expect0); /* Send data, but not enough to overflow a queue */ pair_udp_send(fds_udp[0], 15); pair_udp_send(fds_udp[1], 5); - sock_fanout_read(fds, expect1); + ret = sock_fanout_read(fds, rings, expect1); /* Send more data, overflow the queue */ pair_udp_send(fds_udp[0], 15); /* TODO: ensure consistent order between expect1 and expect2 */ - sock_fanout_read(fds, expect2); + ret |= sock_fanout_read(fds, rings, expect2); + if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) || + munmap(rings[0], RING_NUM_FRAMES * getpagesize())) { + fprintf(stderr, "close rings\n"); + exit(1); + } if (close(fds_udp[1][1]) || close(fds_udp[1][0]) || close(fds_udp[0][1]) || close(fds_udp[0][0]) || close(fds[1]) || close(fds[0])) { fprintf(stderr, "close datapath\n"); exit(1); } + + return ret; +} + +static int set_cpuaffinity(int cpuid) +{ + cpu_set_t mask; + + CPU_ZERO(&mask); + CPU_SET(cpuid, &mask); + if (sched_setaffinity(0, sizeof(mask), &mask)) { + if (errno != EINVAL) { + fprintf(stderr, "setaffinity %d\n", cpuid); + exit(1); + } + return 1; + } + + return 0; } int main(int argc, char **argv) { - const int expect_hash[2][2] = { { 15, 5 }, { 5, 0 } }; - const int expect_hash_rb[2][2] = { { 15, 5 }, { 5, 10 } }; - const int expect_rb[2][2] = { { 20, 0 }, { 0, 15 } }; + const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } }; + const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } }; + const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } }; + const int expect_rb[2][2] = { { 20, 0 }, { 20, 15 } }; + const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } }; + const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } }; + int port_off = 2, tries = 5, ret; test_control_single(); test_control_group(); - test_datapath(PACKET_FANOUT_HASH, expect_hash[0], expect_hash[1]); - test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER, - expect_hash_rb[0], expect_hash_rb[1]); - test_datapath(PACKET_FANOUT_ROLLOVER, expect_rb[0], expect_rb[1]); + /* find a set of ports that do not collide onto the same socket */ + ret = test_datapath(PACKET_FANOUT_HASH, port_off, + expect_hash[0], expect_hash[1]); + while (ret && tries--) { + fprintf(stderr, "info: trying alternate ports (%d)\n", tries); + ret = test_datapath(PACKET_FANOUT_HASH, ++port_off, + expect_hash[0], expect_hash[1]); + } + + ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER, + port_off, expect_hash_rb[0], expect_hash_rb[1]); + ret |= test_datapath(PACKET_FANOUT_LB, + port_off, expect_lb[0], expect_lb[1]); + ret |= test_datapath(PACKET_FANOUT_ROLLOVER, + port_off, expect_rb[0], expect_rb[1]); + + set_cpuaffinity(0); + ret |= test_datapath(PACKET_FANOUT_CPU, port_off, + expect_cpu0[0], expect_cpu0[1]); + if (!set_cpuaffinity(1)) + /* TODO: test that choice alternates with previous */ + ret |= test_datapath(PACKET_FANOUT_CPU, port_off, + expect_cpu1[0], expect_cpu1[1]); + + if (ret) + return 1; printf("OK. All tests passed\n"); return 0; -- 2.20.1