Add an epoll busy poll test using netdevsim.
This test is comprised of:
- busy_poller (via busy_poller.c)
- busy_poll_test.sh which loads netdevsim, sets up network namespaces,
and runs busy_poller to receive data and socat to send data.
The selftest tests two different scenarios:
- busy poll (the pre-existing version in the kernel)
- busy poll with suspend enabled (what this series adds)
The data transmit is a 1MiB temporary file generated from /dev/urandom
and the test is considered passing if the md5sum of the input file to
socat matches the md5sum of the output file from busy_poller.
netdevsim was chosen instead of veth due to netdevsim's support for
netdev-genl.
For now, this test uses the functionality that netdevsim provides. In the
future, perhaps netdevsim can be extended to emulate device IRQs to more
thoroughly test all pre-existing kernel options (like defer_hard_irqs)
and suspend.
Signed-off-by: Joe Damato <jdam...@fastly.com>
Co-developed-by: Martin Karsten <mkars...@uwaterloo.ca>
Signed-off-by: Martin Karsten <mkars...@uwaterloo.ca>
---
v5:
- Updated commit message to replace netcat with socat and fixed
misspelling of netdevsim. No functional/code changes.
v4:
- Updated busy_poll_test.sh:
- use socat instead of nc
- drop cli.py usage from the script
- removed check_ynl
- Updated busy_poller.c:
- use netlink to configure napi parameters
v3:
- New in v3
tools/testing/selftests/net/.gitignore | 1 +
tools/testing/selftests/net/Makefile | 3 +-
tools/testing/selftests/net/busy_poll_test.sh | 164 +++++++++
tools/testing/selftests/net/busy_poller.c | 328 ++++++++++++++++++
4 files changed, 495 insertions(+), 1 deletion(-)
create mode 100755 tools/testing/selftests/net/busy_poll_test.sh
create mode 100644 tools/testing/selftests/net/busy_poller.c
diff --git a/tools/testing/selftests/net/.gitignore
b/tools/testing/selftests/net/.gitignore
index 217d8b7a7365..85b0c4a2179f 100644
--- a/tools/testing/selftests/net/.gitignore
+++ b/tools/testing/selftests/net/.gitignore
@@ -2,6 +2,7 @@
bind_bhash
bind_timewait
bind_wildcard
+busy_poller
cmsg_sender
diag_uid
epoll_busy_poll
diff --git a/tools/testing/selftests/net/Makefile
b/tools/testing/selftests/net/Makefile
index 26a4883a65c9..3ccfe454db1a 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -96,9 +96,10 @@ TEST_PROGS += fdb_flush.sh
TEST_PROGS += fq_band_pktlimit.sh
TEST_PROGS += vlan_hw_filter.sh
TEST_PROGS += bpf_offload.py
+TEST_PROGS += busy_poll_test.sh
# YNL files, must be before "include ..lib.mk"
-YNL_GEN_FILES := ncdevmem
+YNL_GEN_FILES := ncdevmem busy_poller
TEST_GEN_FILES += $(YNL_GEN_FILES)
TEST_FILES := settings
diff --git a/tools/testing/selftests/net/busy_poll_test.sh
b/tools/testing/selftests/net/busy_poll_test.sh
new file mode 100755
index 000000000000..ffc74bc62e5a
--- /dev/null
+++ b/tools/testing/selftests/net/busy_poll_test.sh
@@ -0,0 +1,164 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only
+source net_helper.sh
+
+NSIM_DEV_1_ID=$((256 + RANDOM % 256))
+NSIM_DEV_1_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_DEV_1_ID
+NSIM_DEV_2_ID=$((512 + RANDOM % 256))
+NSIM_DEV_2_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_DEV_2_ID
+
+NSIM_DEV_SYS_NEW=/sys/bus/netdevsim/new_device
+NSIM_DEV_SYS_DEL=/sys/bus/netdevsim/del_device
+NSIM_DEV_SYS_LINK=/sys/bus/netdevsim/link_device
+NSIM_DEV_SYS_UNLINK=/sys/bus/netdevsim/unlink_device
+
+setup_ns()
+{
+ set -e
+ ip netns add nssv
+ ip netns add nscl
+
+ NSIM_DEV_1_NAME=$(find $NSIM_DEV_1_SYS/net -maxdepth 1 -type d ! \
+ -path $NSIM_DEV_1_SYS/net -exec basename {} \;)
+ NSIM_DEV_2_NAME=$(find $NSIM_DEV_2_SYS/net -maxdepth 1 -type d ! \
+ -path $NSIM_DEV_2_SYS/net -exec basename {} \;)
+
+ # ensure the server has 1 queue
+ ethtool -L $NSIM_DEV_1_NAME combined 1 2>/dev/null
+
+ ip link set $NSIM_DEV_1_NAME netns nssv
+ ip link set $NSIM_DEV_2_NAME netns nscl
+
+ ip netns exec nssv ip addr add '192.168.1.1/24' dev $NSIM_DEV_1_NAME
+ ip netns exec nscl ip addr add '192.168.1.2/24' dev $NSIM_DEV_2_NAME
+
+ ip netns exec nssv ip link set dev $NSIM_DEV_1_NAME up
+ ip netns exec nscl ip link set dev $NSIM_DEV_2_NAME up
+
+ set +e
+}
+
+cleanup_ns()
+{
+ ip netns del nscl
+ ip netns del nssv
+}
+
+test_busypoll()
+{
+ tmp_file=$(mktemp)
+ out_file=$(mktemp)
+
+ # fill a test file with random data
+ dd if=/dev/urandom of=${tmp_file} bs=1M count=1 2> /dev/null
+
+ timeout -k 1s 30s ip netns exec nssv ./busy_poller -p48675
-b192.168.1.1 -m8 -u0 -P1 -g16 -i${NSIM_DEV_1_IFIDX} -o${out_file}&
+
+ wait_local_port_listen nssv 48675 tcp
+
+ ip netns exec nscl socat -u $tmp_file TCP:192.168.1.1:48675
+
+ wait
+
+ tmp_file_md5sum=$(md5sum $tmp_file | cut -f1 -d' ')
+ out_file_md5sum=$(md5sum $out_file | cut -f1 -d' ')
+
+ if [ "$tmp_file_md5sum" = "$out_file_md5sum" ]; then
+ res=0
+ else
+ echo "md5sum mismatch"
+ echo "input file md5sum: ${tmp_file_md5sum}";
+ echo "output file md5sum: ${out_file_md5sum}";
+ res=1
+ fi
+
+ rm $out_file $tmp_file
+
+ return $res
+}
+
+test_busypoll_with_suspend()
+{
+ tmp_file=$(mktemp)
+ out_file=$(mktemp)
+
+ # fill a test file with random data
+ dd if=/dev/urandom of=${tmp_file} bs=1M count=1 2> /dev/null
+
+ timeout -k 1s 30s ip netns exec nssv ./busy_poller -p48675
-b192.168.1.1 -m8 -u0 -P1 -g16 -d100 -r50000 -s20000000 -i${NSIM_DEV_1_IFIDX}
-o${out_file}&
+
+ wait_local_port_listen nssv 48675 tcp
+
+ ip netns exec nscl socat -u $tmp_file TCP:192.168.1.1:48675
+
+ wait
+
+ tmp_file_md5sum=$(md5sum $tmp_file | cut -f1 -d' ')
+ out_file_md5sum=$(md5sum $out_file | cut -f1 -d' ')
+
+ if [ "$tmp_file_md5sum" = "$out_file_md5sum" ]; then
+ res=0
+ else
+ echo "md5sum mismatch"
+ echo "input file md5sum: ${tmp_file_md5sum}";
+ echo "output file md5sum: ${out_file_md5sum}";
+ res=1
+ fi
+
+ rm $out_file $tmp_file
+
+ return $res
+}
+
+###
+### Code start
+###
+
+modprobe netdevsim
+
+# linking
+
+echo $NSIM_DEV_1_ID > $NSIM_DEV_SYS_NEW
+echo $NSIM_DEV_2_ID > $NSIM_DEV_SYS_NEW
+udevadm settle
+
+setup_ns
+
+NSIM_DEV_1_FD=$((256 + RANDOM % 256))
+exec {NSIM_DEV_1_FD}</var/run/netns/nssv
+NSIM_DEV_1_IFIDX=$(ip netns exec nssv cat
/sys/class/net/$NSIM_DEV_1_NAME/ifindex)
+
+NSIM_DEV_2_FD=$((256 + RANDOM % 256))
+exec {NSIM_DEV_2_FD}</var/run/netns/nscl
+NSIM_DEV_2_IFIDX=$(ip netns exec nscl cat
/sys/class/net/$NSIM_DEV_2_NAME/ifindex)
+
+echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_2_FD:$NSIM_DEV_2_IFIDX" >
$NSIM_DEV_SYS_LINK
+if [ $? -ne 0 ]; then
+ echo "linking netdevsim1 with netdevsim2 should succeed"
+ cleanup_ns
+ exit 1
+fi
+
+test_busypoll
+if [ $? -ne 0 ]; then
+ echo "test_busypoll failed"
+ cleanup_ns
+ exit 1
+fi
+
+test_busypoll_with_suspend
+if [ $? -ne 0 ]; then
+ echo "test_busypoll_with_suspend failed"
+ cleanup_ns
+ exit 1
+fi
+
+echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX" > $NSIM_DEV_SYS_UNLINK
+
+echo $NSIM_DEV_2_ID > $NSIM_DEV_SYS_DEL
+
+cleanup_ns
+
+modprobe -r netdevsim
+
+exit 0
diff --git a/tools/testing/selftests/net/busy_poller.c
b/tools/testing/selftests/net/busy_poller.c
new file mode 100644
index 000000000000..8d8aa9e5939a
--- /dev/null
+++ b/tools/testing/selftests/net/busy_poller.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <assert.h>
+#include <errno.h>
+#include <error.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#include <sys/ioctl.h>
+#include <sys/epoll.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include <linux/netlink.h>
+#include <linux/genetlink.h>
+#include "netdev-user.h"
+#include <ynl.h>
+
+/* if the headers haven't been updated, we need to define some things */
+#if !defined(EPOLL_IOC_TYPE)
+struct epoll_params {
+ uint32_t busy_poll_usecs;
+ uint16_t busy_poll_budget;
+ uint8_t prefer_busy_poll;
+
+ /* pad the struct to a multiple of 64bits */
+ uint8_t __pad;
+};
+
+#define EPOLL_IOC_TYPE 0x8A
+#define EPIOCSPARAMS _IOW(EPOLL_IOC_TYPE, 0x01, struct epoll_params)
+#define EPIOCGPARAMS _IOR(EPOLL_IOC_TYPE, 0x02, struct epoll_params)
+#endif
+
+static uint32_t cfg_port = 8000;
+static struct in_addr cfg_bind_addr = { .s_addr = INADDR_ANY };
+static char *cfg_outfile;
+static int cfg_max_events = 8;
+static int cfg_ifindex;
+
+/* busy poll params */
+static uint32_t cfg_busy_poll_usecs;
+static uint16_t cfg_busy_poll_budget;
+static uint8_t cfg_prefer_busy_poll;
+
+/* IRQ params */
+static uint32_t cfg_defer_hard_irqs;
+static uint64_t cfg_gro_flush_timeout;
+static uint64_t cfg_irq_suspend_timeout;
+
+static void usage(const char *filepath)
+{
+ error(1, 0,
+ "Usage: %s -p<port> -b<addr> -m<max_events> -u<busy_poll_usecs>
-P<prefer_busy_poll> -g<busy_poll_budget> -o<outfile> -d<defer_hard_irqs>
-r<gro_flush_timeout> -s<irq_suspend_timeout> -i<ifindex>",
+ filepath);
+}
+
+static void parse_opts(int argc, char **argv)
+{
+ int ret;
+ int c;
+
+ if (argc <= 1)
+ usage(argv[0]);
+
+ while ((c = getopt(argc, argv, "p:m:b:u:P:g:o:d:r:s:i:")) != -1) {
+ switch (c) {
+ case 'u':
+ cfg_busy_poll_usecs = strtoul(optarg, NULL, 0);
+ if (cfg_busy_poll_usecs == ULONG_MAX ||
+ cfg_busy_poll_usecs > UINT32_MAX)
+ error(1, ERANGE, "busy_poll_usecs too large");
+ break;
+ case 'P':
+ cfg_prefer_busy_poll = strtoul(optarg, NULL, 0);
+ if (cfg_prefer_busy_poll == ULONG_MAX ||
+ cfg_prefer_busy_poll > 1)
+ error(1, ERANGE,
+ "prefer busy poll should be 0 or 1");
+ break;
+ case 'g':
+ cfg_busy_poll_budget = strtoul(optarg, NULL, 0);
+ if (cfg_busy_poll_budget == ULONG_MAX ||
+ cfg_busy_poll_budget > UINT16_MAX)
+ error(1, ERANGE,
+ "busy poll budget must be [0,
UINT16_MAX]");
+ break;
+ case 'p':
+ cfg_port = strtoul(optarg, NULL, 0);
+ if (cfg_port > UINT16_MAX)
+ error(1, ERANGE, "port must be <= 65535");
+ break;
+ case 'b':
+ ret = inet_aton(optarg, &cfg_bind_addr);
+ if (ret == 0)
+ error(1, errno,
+ "bind address %s invalid", optarg);
+ break;
+ case 'o':
+ cfg_outfile = strdup(optarg);
+ if (!cfg_outfile)
+ error(1, 0, "outfile invalid");
+ break;
+ case 'm':
+ cfg_max_events = strtol(optarg, NULL, 0);
+
+ if (cfg_max_events == LONG_MIN ||
+ cfg_max_events == LONG_MAX ||
+ cfg_max_events <= 0)
+ error(1, ERANGE,
+ "max events must be > 0 and < LONG_MAX");
+ break;
+ case 'd':
+ cfg_defer_hard_irqs = strtoul(optarg, NULL, 0);
+
+ if (cfg_defer_hard_irqs == ULONG_MAX ||
+ cfg_defer_hard_irqs > INT32_MAX)
+ error(1, ERANGE,
+ "defer_hard_irqs must be <= INT32_MAX");
+ break;
+ case 'r':
+ cfg_gro_flush_timeout = strtoull(optarg, NULL, 0);
+
+ if (cfg_gro_flush_timeout == ULLONG_MAX)
+ error(1, ERANGE,
+ "gro_flush_timeout must be < ULLONG_MAX");
+ break;
+ case 's':
+ cfg_irq_suspend_timeout = strtoull(optarg, NULL, 0);
+
+ if (cfg_irq_suspend_timeout == ULLONG_MAX)
+ error(1, ERANGE,
+ "irq_suspend_timeout must be <
ULLONG_MAX");
+ break;
+ case 'i':
+ cfg_ifindex = strtoul(optarg, NULL, 0);
+ if (cfg_ifindex == ULONG_MAX)
+ error(1, ERANGE,
+ "ifindex must be < ULONG_MAX");
+ break;
+ }
+ }
+
+ if (!cfg_ifindex)
+ usage(argv[0]);
+
+ if (optind != argc)
+ usage(argv[0]);
+}
+
+static void epoll_ctl_add(int epfd, int fd, uint32_t events)
+{
+ struct epoll_event ev;
+
+ ev.events = events;
+ ev.data.fd = fd;
+ if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev) == -1)
+ error(1, errno, "epoll_ctl add fd: %d", fd);
+}
+
+static void setnonblock(int sockfd)
+{
+ int flags;
+
+ flags = fcntl(sockfd, F_GETFL, 0);
+
+ if (fcntl(sockfd, F_SETFL, flags | O_NONBLOCK) == -1)
+ error(1, errno, "unable to set socket to nonblocking mode");
+}
+
+static void write_chunk(int fd, char *buf, ssize_t buflen)
+{
+ ssize_t remaining = buflen;
+ char *buf_offset = buf;
+ ssize_t writelen = 0;
+ ssize_t write_result;
+
+ while (writelen < buflen) {
+ write_result = write(fd, buf_offset, remaining);
+ if (write_result == -1)
+ error(1, errno, "unable to write data to outfile");
+
+ writelen += write_result;
+ remaining -= write_result;
+ buf_offset += write_result;
+ }
+}
+
+static void setup_queue(void)
+{
+ struct netdev_napi_get_list *napi_list = NULL;
+ struct netdev_napi_get_req_dump *req = NULL;
+ struct netdev_napi_set_req *set_req = NULL;
+ struct ynl_sock *ys;
+ struct ynl_error yerr;
+ uint32_t napi_id;
+
+ ys = ynl_sock_create(&ynl_netdev_family, &yerr);
+ if (!ys)
+ error(1, 0, "YNL: %s", yerr.msg);
+
+ req = netdev_napi_get_req_dump_alloc();
+ netdev_napi_get_req_dump_set_ifindex(req, cfg_ifindex);
+ napi_list = netdev_napi_get_dump(ys, req);
+
+ /* assume there is 1 NAPI configured and take the first */
+ if (napi_list->obj._present.id)
+ napi_id = napi_list->obj.id;
+ else
+ error(1, 0, "napi ID not present?");
+
+ set_req = netdev_napi_set_req_alloc();
+ netdev_napi_set_req_set_id(set_req, napi_id);
+ netdev_napi_set_req_set_defer_hard_irqs(set_req, cfg_defer_hard_irqs);
+ netdev_napi_set_req_set_gro_flush_timeout(set_req,
+ cfg_gro_flush_timeout);
+ netdev_napi_set_req_set_irq_suspend_timeout(set_req,
+ cfg_irq_suspend_timeout);
+
+ if (netdev_napi_set(ys, set_req))
+ error(1, 0, "can't set NAPI params: %s\n", yerr.msg);
+
+ netdev_napi_get_list_free(napi_list);
+ netdev_napi_get_req_dump_free(req);
+ netdev_napi_set_req_free(set_req);
+ ynl_sock_destroy(ys);
+}
+
+static void run_poller(void)
+{
+ struct epoll_event events[cfg_max_events];
+ struct epoll_params epoll_params = {0};
+ struct sockaddr_in server_addr;
+ int i, epfd, nfds;
+ ssize_t readlen;
+ int outfile_fd;
+ char buf[1024];
+ int sockfd;
+ int conn;
+ int val;
+
+ outfile_fd = open(cfg_outfile, O_WRONLY | O_CREAT, 0644);
+ if (outfile_fd == -1)
+ error(1, errno, "unable to open outfile: %s", cfg_outfile);
+
+ sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+ if (sockfd == -1)
+ error(1, errno, "unable to create listen socket");
+
+ server_addr.sin_family = AF_INET;
+ server_addr.sin_port = htons(cfg_port);
+ server_addr.sin_addr = cfg_bind_addr;
+
+ epoll_params.busy_poll_usecs = cfg_busy_poll_usecs;
+ epoll_params.busy_poll_budget = cfg_busy_poll_budget;
+ epoll_params.prefer_busy_poll = cfg_prefer_busy_poll;
+ epoll_params.__pad = 0;
+
+ val = 1;
+ if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)))
+ error(1, errno, "poller setsockopt reuseaddr");
+
+ setnonblock(sockfd);
+
+ if (bind(sockfd, (struct sockaddr *)&server_addr,
+ sizeof(struct sockaddr_in)))
+ error(0, errno, "poller bind to port: %d\n", cfg_port);
+
+ if (listen(sockfd, 1))
+ error(1, errno, "poller listen");
+
+ epfd = epoll_create1(0);
+ if (ioctl(epfd, EPIOCSPARAMS, &epoll_params) == -1)
+ error(1, errno, "unable to set busy poll params");
+
+ epoll_ctl_add(epfd, sockfd, EPOLLIN | EPOLLOUT | EPOLLET);
+
+ for (;;) {
+ nfds = epoll_wait(epfd, events, cfg_max_events, -1);
+ for (i = 0; i < nfds; i++) {
+ if (events[i].data.fd == sockfd) {
+ conn = accept(sockfd, NULL, NULL);
+ if (conn == -1)
+ error(1, errno,
+ "accepting incoming connection
failed");
+
+ setnonblock(conn);
+ epoll_ctl_add(epfd, conn,
+ EPOLLIN | EPOLLET | EPOLLRDHUP |
+ EPOLLHUP);
+ } else if (events[i].events & EPOLLIN) {
+ for (;;) {
+ readlen = read(events[i].data.fd, buf,
+ sizeof(buf));
+ if (readlen > 0)
+ write_chunk(outfile_fd, buf,
+ readlen);
+ else
+ break;
+ }
+ } else {
+ /* spurious event ? */
+ }
+ if (events[i].events & (EPOLLRDHUP | EPOLLHUP)) {
+ epoll_ctl(epfd, EPOLL_CTL_DEL,
+ events[i].data.fd, NULL);
+ close(events[i].data.fd);
+ close(outfile_fd);
+ return;
+ }
+ }
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ parse_opts(argc, argv);
+ setup_queue();
+ run_poller();
+ return 0;
+}
--
2.25.1
