| Message ID | 20241104215542.215919-7-jdamato@fastly.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Suspend IRQs during application busy periods | expand |
On 11/04, Joe Damato wrote: > 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 <jdamato@fastly.com> > Co-developed-by: Martin Karsten <mkarsten@uwaterloo.ca> > Signed-off-by: Martin Karsten <mkarsten@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); Any reason you're not printing to stdout? And then redirect it to a file in the shell script if needed. Lets you save some code on open/close and flag parsing :-p But I guess can keep it since you already have it all working. Acked-by: Stanislav Fomichev <sdf@fomichev.me>
On Mon, Nov 04, 2024 at 07:50:21PM -0800, Stanislav Fomichev wrote: > On 11/04, Joe Damato wrote: > > 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 <jdamato@fastly.com> > > Co-developed-by: Martin Karsten <mkarsten@uwaterloo.ca> > > Signed-off-by: Martin Karsten <mkarsten@uwaterloo.ca> > > --- [...] > > + > > +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); > > Any reason you're not printing to stdout? And then redirect it to a file > in the shell script if needed. Lets you save some code on open/close > and flag parsing :-p But I guess can keep it since you already have it > all working. No reason in particular; I thought about this while writing it, but ended up adding it as a flag in case others come along to extend this test in some capacity. > Acked-by: Stanislav Fomichev <sdf@fomichev.me> Thanks for the ack!
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; +}
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 <jdamato@fastly.com> Co-developed-by: Martin Karsten <mkarsten@uwaterloo.ca> Signed-off-by: Martin Karsten <mkarsten@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