From 531c92b82f7fbff17e1f48e78f2a483099b06674 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jakub=20Urba=C5=84czyk?= Date: Mon, 3 Aug 2020 20:23:56 +0200 Subject: [PATCH] tests: zebra netlink testcases MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Signed-off-by: Jakub Urbańczyk --- tests/topotests/zebra_netlink/__init__.py | 0 tests/topotests/zebra_netlink/r1/sharpd.conf | 0 .../topotests/zebra_netlink/r1/v4_route.json | 2802 +++++++++++++++++ tests/topotests/zebra_netlink/r1/zebra.conf | 2 + .../zebra_netlink/test_zebra_netlink.py | 131 + zebra/kernel_netlink.c | 77 +- zebra/kernel_netlink.h | 11 + zebra/zebra_vty.c | 49 + 8 files changed, 3058 insertions(+), 14 deletions(-) create mode 100644 tests/topotests/zebra_netlink/__init__.py create mode 100644 tests/topotests/zebra_netlink/r1/sharpd.conf create mode 100644 tests/topotests/zebra_netlink/r1/v4_route.json create mode 100644 tests/topotests/zebra_netlink/r1/zebra.conf create mode 100755 tests/topotests/zebra_netlink/test_zebra_netlink.py diff --git a/tests/topotests/zebra_netlink/__init__.py b/tests/topotests/zebra_netlink/__init__.py new file mode 100644 index 0000000000..e69de29bb2 diff --git a/tests/topotests/zebra_netlink/r1/sharpd.conf b/tests/topotests/zebra_netlink/r1/sharpd.conf new file mode 100644 index 0000000000..e69de29bb2 diff --git a/tests/topotests/zebra_netlink/r1/v4_route.json b/tests/topotests/zebra_netlink/r1/v4_route.json new file mode 100644 index 0000000000..61e9bb240b --- /dev/null +++ b/tests/topotests/zebra_netlink/r1/v4_route.json @@ -0,0 +1,2802 @@ +{ + "2.1.3.7\/32":[ + { + "prefix":"2.1.3.7\/32", + "protocol":"sharp", + "selected":true, + "destSelected":true, + "distance":150, + "metric":0, + "installed":true, + "table":254, + "internalStatus":16, + "internalFlags":9, + "internalNextHopNum":1, + "internalNextHopActiveNum":1, + "nexthops":[ + { + "flags":3, + "fib":true, + "ip":"192.168.1.1", + "afi":"ipv4", + "interfaceIndex":2, + 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"internalNextHopActiveNum":1, + "nexthops":[ + { + "flags":3, + "fib":true, + "ip":"192.168.1.1", + "afi":"ipv4", + "interfaceIndex":2, + "interfaceName":"r1-eth0", + "active":true, + "weight":1 + } + ] + } + ], + "2.1.3.104\/32":[ + { + "prefix":"2.1.3.104\/32", + "protocol":"sharp", + "selected":true, + "destSelected":true, + "distance":150, + "metric":0, + "installed":true, + "table":254, + "internalStatus":16, + "internalFlags":9, + "internalNextHopNum":1, + "internalNextHopActiveNum":1, + "nexthops":[ + { + "flags":3, + "fib":true, + "ip":"192.168.1.1", + "afi":"ipv4", + "interfaceIndex":2, + "interfaceName":"r1-eth0", + "active":true, + "weight":1 + } + ] + } + ], + "2.1.3.105\/32":[ + { + "prefix":"2.1.3.105\/32", + "protocol":"sharp", + "selected":true, + "destSelected":true, + "distance":150, + "metric":0, + "installed":true, + "table":254, + "internalStatus":16, + "internalFlags":9, + "internalNextHopNum":1, + "internalNextHopActiveNum":1, + "nexthops":[ + { + "flags":3, + "fib":true, + "ip":"192.168.1.1", + "afi":"ipv4", + "interfaceIndex":2, + "interfaceName":"r1-eth0", + "active":true, + "weight":1 + } + ] + } + ], + "2.1.3.106\/32":[ + { + "prefix":"2.1.3.106\/32", + "protocol":"sharp", + "selected":true, + "destSelected":true, + "distance":150, + "metric":0, + "installed":true, + "table":254, + "internalStatus":16, + "internalFlags":9, + "internalNextHopNum":1, + "internalNextHopActiveNum":1, + "nexthops":[ + { + "flags":3, + "fib":true, + "ip":"192.168.1.1", + "afi":"ipv4", + "interfaceIndex":2, + "interfaceName":"r1-eth0", + "active":true, + "weight":1 + } + ] + } + ] +} diff --git a/tests/topotests/zebra_netlink/r1/zebra.conf b/tests/topotests/zebra_netlink/r1/zebra.conf new file mode 100644 index 0000000000..786be19ad4 --- /dev/null +++ b/tests/topotests/zebra_netlink/r1/zebra.conf @@ -0,0 +1,2 @@ +int r1-eth0 + ip address 192.168.1.1/24 \ No newline at end of file diff --git a/tests/topotests/zebra_netlink/test_zebra_netlink.py b/tests/topotests/zebra_netlink/test_zebra_netlink.py new file mode 100755 index 0000000000..7b692c75ab --- /dev/null +++ b/tests/topotests/zebra_netlink/test_zebra_netlink.py @@ -0,0 +1,131 @@ +#!/usr/bin/env python + +# +# test_zebra_netlink.py +# +# Copyright (c) 2020 by +# +# Permission to use, copy, modify, and/or distribute this software +# for any purpose with or without fee is hereby granted, provided +# that the above copyright notice and this permission notice appear +# in all copies. +# +# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES +# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR +# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY +# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS +# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE +# OF THIS SOFTWARE. +# + +""" +test_zebra_netlink.py: Test some basic interactions with kernel using Netlink + +""" + +import os +import re +import sys +import pytest +import json +import platform +from functools import partial + +# Save the Current Working Directory to find configuration files. +CWD = os.path.dirname(os.path.realpath(__file__)) +sys.path.append(os.path.join(CWD, "../")) + +# pylint: disable=C0413 +# Import topogen and topotest helpers +from lib import topotest +from lib.topogen import Topogen, TopoRouter, get_topogen +from lib.topolog import logger +from lib.common_config import shutdown_bringup_interface + +# Required to instantiate the topology builder class. +from mininet.topo import Topo + +##################################################### +## +## Network Topology Definition +## +##################################################### + + +class ZebraTopo(Topo): + "Test topology builder" + + def build(self, *_args, **_opts): + "Build function" + tgen = get_topogen(self) + + tgen.add_router("r1") + + # Create a empty network for router 1 + switch = tgen.add_switch("s1") + switch.add_link(tgen.gears["r1"]) + + +##################################################### +## +## Tests starting +## +##################################################### + + +def setup_module(mod): + "Sets up the pytest environment" + tgen = Topogen(ZebraTopo, mod.__name__) + tgen.start_topology() + + router_list = tgen.routers() + for rname, router in router_list.iteritems(): + router.load_config( + TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname)) + ) + + router.load_config( + TopoRouter.RD_SHARP, os.path.join(CWD, "{}/sharpd.conf".format(rname)) + ) + + # Initialize all routers. + tgen.start_router() + + +def teardown_module(_mod): + "Teardown the pytest environment" + tgen = get_topogen() + + # This function tears down the whole topology. + tgen.stop_topology() + + +def test_zebra_netlink_batching(): + "Test the situation where dataplane fills netlink send buffer entirely." + logger.info( + "Test the situation where dataplane fills netlink send buffer entirely." + ) + tgen = get_topogen() + if tgen.routers_have_failure(): + ptyest.skip("skipped because of preview test failure") + r1 = tgen.gears["r1"] + + # Reduce the size of the buffer to hit the limit. + r1.vtysh_cmd("conf t\nzebra kernel netlink batch-tx-buf 256 256") + + r1.vtysh_cmd("sharp install routes 2.1.3.7 nexthop 192.168.1.1 100") + json_file = "{}/r1/v4_route.json".format(CWD) + expected = json.loads(open(json_file).read()) + test_func = partial(topotest.router_json_cmp, r1, "show ip route json", expected,) + _, result = topotest.run_and_expect(test_func, None, count=2, wait=0.5) + assertmsg = '"r1" JSON output mismatches' + assert result is None, assertmsg + + r1.vtysh_cmd("sharp remove routes 2.1.3.7 100") + + +if __name__ == "__main__": + args = ["-s"] + sys.argv[1:] + sys.exit(pytest.main(args)) diff --git a/zebra/kernel_netlink.c b/zebra/kernel_netlink.c index e6a4a3d9e2..b04076b945 100644 --- a/zebra/kernel_netlink.c +++ b/zebra/kernel_netlink.c @@ -84,16 +84,7 @@ #define RTPROT_MROUTED 17 #endif -#define NL_BATCH_TX_BUFSIZE (16 * NL_PKT_BUF_SIZE) - -/* - * For every request sent to the kernel that has failed we get an error message, - * which contains a standard netlink message header and the payload consisting - * of an error code and the original netlink mesage. So the receiving buffer - * must be at least as big as the transmitting buffer increased by some space - * for headers. - */ -#define NL_BATCH_RX_BUFSIZE (NL_BATCH_TX_BUFSIZE + NL_PKT_BUF_SIZE) +#define NL_DEFAULT_BATCH_BUFSIZE (16 * NL_PKT_BUF_SIZE) /* * We limit the batch's size to a number smaller than the length of the @@ -103,7 +94,16 @@ * big enough (bigger than the biggest Netlink message) then this situation * won't occur. */ -#define NL_BATCH_SEND_THRESHOLD (NL_BATCH_TX_BUFSIZE - NL_PKT_BUF_SIZE) +#define NL_DEFAULT_BATCH_SEND_THRESHOLD (15 * NL_PKT_BUF_SIZE) + +/* + * For every request sent to the kernel that has failed we get an error message, + * which contains a standard netlink message header and the payload consisting + * of an error code and the original netlink mesage. So the receiving buffer + * must be at least as big as the transmitting buffer increased by some space + * for headers. + */ +#define NL_BATCH_RX_BUFSIZE (NL_DEFAULT_BATCH_BUFSIZE + NL_PKT_BUF_SIZE) static const struct message nlmsg_str[] = {{RTM_NEWROUTE, "RTM_NEWROUTE"}, {RTM_DELROUTE, "RTM_DELROUTE"}, @@ -172,9 +172,16 @@ extern uint32_t nl_rcvbufsize; extern struct zebra_privs_t zserv_privs; -char nl_batch_tx_buf[NL_BATCH_TX_BUFSIZE]; +DEFINE_MTYPE_STATIC(ZEBRA, NL_BUF, "Zebra Netlink buffers") + +size_t nl_batch_tx_bufsize; +char *nl_batch_tx_buf; + char nl_batch_rx_buf[NL_BATCH_RX_BUFSIZE]; +_Atomic uint32_t nl_batch_bufsize = NL_DEFAULT_BATCH_BUFSIZE; +_Atomic uint32_t nl_batch_send_threshold = NL_DEFAULT_BATCH_SEND_THRESHOLD; + struct nl_batch { void *buf; size_t bufsiz; @@ -195,6 +202,33 @@ struct nl_batch { struct dplane_ctx_q *ctx_out_q; }; +int netlink_config_write_helper(struct vty *vty) +{ + uint32_t size = + atomic_load_explicit(&nl_batch_bufsize, memory_order_relaxed); + uint32_t threshold = atomic_load_explicit(&nl_batch_send_threshold, + memory_order_relaxed); + + if (size != NL_DEFAULT_BATCH_BUFSIZE + || threshold != NL_DEFAULT_BATCH_SEND_THRESHOLD) + vty_out(vty, "zebra kernel netlink batch-tx-buf %u %u\n", size, + threshold); + + return 0; +} + +void netlink_set_batch_buffer_size(uint32_t size, uint32_t threshold, bool set) +{ + if (!set) { + size = NL_DEFAULT_BATCH_BUFSIZE; + threshold = NL_DEFAULT_BATCH_SEND_THRESHOLD; + } + + atomic_store_explicit(&nl_batch_bufsize, size, memory_order_relaxed); + atomic_store_explicit(&nl_batch_send_threshold, threshold, + memory_order_relaxed); +} + int netlink_talk_filter(struct nlmsghdr *h, ns_id_t ns_id, int startup) { /* @@ -1232,9 +1266,24 @@ static void nl_batch_reset(struct nl_batch *bth) static void nl_batch_init(struct nl_batch *bth, struct dplane_ctx_q *ctx_out_q) { + /* + * If the size of the buffer has changed, free and then allocate a new + * one. + */ + size_t bufsize = + atomic_load_explicit(&nl_batch_bufsize, memory_order_relaxed); + if (bufsize != nl_batch_tx_bufsize) { + if (nl_batch_tx_buf) + XFREE(MTYPE_NL_BUF, nl_batch_tx_buf); + + nl_batch_tx_buf = XCALLOC(MTYPE_NL_BUF, bufsize); + nl_batch_tx_bufsize = bufsize; + } + bth->buf = nl_batch_tx_buf; - bth->bufsiz = sizeof(nl_batch_tx_buf); - bth->limit = NL_BATCH_SEND_THRESHOLD; + bth->bufsiz = bufsize; + bth->limit = atomic_load_explicit(&nl_batch_send_threshold, + memory_order_relaxed); bth->ctx_out_q = ctx_out_q; diff --git a/zebra/kernel_netlink.h b/zebra/kernel_netlink.h index 7f66f2b28c..c02e16480b 100644 --- a/zebra/kernel_netlink.h +++ b/zebra/kernel_netlink.h @@ -129,6 +129,17 @@ extern enum netlink_msg_status netlink_batch_add_msg( ssize_t (*msg_encoder)(struct zebra_dplane_ctx *, void *, size_t), bool ignore_res); +/* + * Vty/cli apis + */ +extern int netlink_config_write_helper(struct vty *vty); + +/* + * Configure size of the batch buffer and sending threshold. If 'unset', reset + * to default value. + */ +extern void netlink_set_batch_buffer_size(uint32_t size, uint32_t threshold, + bool set); #endif /* HAVE_NETLINK */ diff --git a/zebra/zebra_vty.c b/zebra/zebra_vty.c index fc1eb6223d..a7b992bbb5 100644 --- a/zebra/zebra_vty.c +++ b/zebra/zebra_vty.c @@ -57,6 +57,7 @@ #include "zebra/interface.h" #include "northbound_cli.h" #include "zebra/zebra_nb.h" +#include "zebra/kernel_netlink.h" extern int allow_delete; @@ -3397,6 +3398,11 @@ static int config_write_protocol(struct vty *vty) if (!zebra_nhg_kernel_nexthops_enabled()) vty_out(vty, "no zebra nexthop kernel enable\n"); +#ifdef HAVE_NETLINK + /* Include netlink info */ + netlink_config_write_helper(vty); +#endif /* HAVE_NETLINK */ + return 1; } @@ -3719,6 +3725,44 @@ DEFUN_HIDDEN (show_frr, return CMD_SUCCESS; } +#ifdef HAVE_NETLINK +DEFUN_HIDDEN(zebra_kernel_netlink_batch_tx_buf, + zebra_kernel_netlink_batch_tx_buf_cmd, + "zebra kernel netlink batch-tx-buf (1-1048576) (1-1048576)", + ZEBRA_STR + "Zebra kernel interface\n" + "Set Netlink parameters\n" + "Set batch buffer size and send threshold\n" + "Size of the buffer\n" + "Send threshold\n") +{ + uint32_t bufsize = 0, threshold = 0; + + bufsize = strtoul(argv[4]->arg, NULL, 10); + threshold = strtoul(argv[5]->arg, NULL, 10); + + netlink_set_batch_buffer_size(bufsize, threshold, true); + + return CMD_SUCCESS; +} + +DEFUN_HIDDEN(no_zebra_kernel_netlink_batch_tx_buf, + no_zebra_kernel_netlink_batch_tx_buf_cmd, + "no zebra kernel netlink batch-tx-buf [(0-1048576)] [(0-1048576)]", + NO_STR ZEBRA_STR + "Zebra kernel interface\n" + "Set Netlink parameters\n" + "Set batch buffer size and send threshold\n" + "Size of the buffer\n" + "Send threshold\n") +{ + netlink_set_batch_buffer_size(0, 0, false); + + return CMD_SUCCESS; +} + +#endif /* HAVE_NETLINK */ + /* IP node for static routes. */ static int zebra_ip_config(struct vty *vty); static struct cmd_node ip_node = { @@ -3856,5 +3900,10 @@ void zebra_vty_init(void) install_element(CONFIG_NODE, &zebra_dplane_queue_limit_cmd); install_element(CONFIG_NODE, &no_zebra_dplane_queue_limit_cmd); +#ifdef HAVE_NETLINK + install_element(CONFIG_NODE, &zebra_kernel_netlink_batch_tx_buf_cmd); + install_element(CONFIG_NODE, &no_zebra_kernel_netlink_batch_tx_buf_cmd); +#endif /* HAVE_NETLINK */ + install_element(VIEW_NODE, &zebra_show_routing_tables_summary_cmd); } -- 2.39.5