iframe-proxy | Sunbelt Computer Software

History

200 lines (155 loc) · 4.94 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

/* Interface related functions.

* Author: Steffen Vogel <post@steffenvogel.de>

* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University

* SPDX-License-Identifier: Apache-2.0

#include <cstdio>

#include <cstdlib>

#include <dirent.h>

#include <netlink/route/link.h>

#include <villas/cpuset.hpp>

#include <villas/exceptions.hpp>

#include <villas/kernel/if.hpp>

#include <villas/kernel/kernel.hpp>

#include <villas/kernel/nl.hpp>

#include <villas/kernel/tc.hpp>

#include <villas/kernel/tc_netem.hpp>

#include <villas/node/config.hpp>

#include <villas/nodes/socket.hpp>

#include <villas/super_node.hpp>

#include <villas/utils.hpp>

using namespace villas;

using namespace villas::node;

using namespace villas::utils;

using namespace villas::kernel;

Interface::Interface(struct rtnl_link *link, int aff)

: nl_link(link), tc_qdisc(nullptr), affinity(aff) {

logger = Log::get(fmt::format("kernel:if:{}", getName()));

int n = getIRQs();

if (n)

logger->warn("Did not found any interrupts");

logger->debug("Found {} IRQs", irqs.size());

}

Interface::~Interface() {

if (tc_qdisc)

rtnl_qdisc_put(tc_qdisc);

}

int Interface::start() {

logger->info("Starting interface which is used by {} nodes", nodes.size());

// Set affinity for network interfaces (skip _loopback_ dev)

if (affinity)

setAffinity(affinity);

// Assign fwmark's to nodes which have netem options

int ret, fwmark = 0;

for (auto *n : nodes) {

if (n->tc_qdisc && n->fwmark < 0)

n->fwmark = 1 + fwmark++;

}

// Abort if no node is using netem

if (fwmark == 0)

return 0;

if (getuid() != 0)

throw RuntimeError("Network emulation requires super-user privileges!");

// Replace root qdisc

ret = tc::prio(this, &tc_qdisc, TC_HANDLE(1, 0), TC_H_ROOT, fwmark);

if (ret)

throw RuntimeError("Failed to setup priority queuing discipline: {}",

nl_geterror(ret));

// Create netem qdisks and appropriate filter per netem node

for (auto *n : nodes) {

if (n->tc_qdisc) {

ret =

tc::mark(this, &n->tc_classifier, TC_HANDLE(1, n->fwmark), n->fwmark);

if (ret)

throw RuntimeError("Failed to setup FW mark classifier: {}",

nl_geterror(ret));

char *buf = tc::netem_print(n->tc_qdisc);

logger->debug("Starting network emulation for FW mark {}: {}", n->fwmark,

buf);

free(buf);

ret = tc::netem(this, &n->tc_qdisc, TC_HANDLE(0x1000 + n->fwmark, 0),

TC_HANDLE(1, n->fwmark));

if (ret)

throw RuntimeError("Failed to setup netem qdisc: {}", nl_geterror(ret));

}

return 0;

}

int Interface::stop() {

logger->info("Stopping interface");

if (affinity)

setAffinity(-1L);

if (tc_qdisc)

tc::reset(this);

return 0;

}

std::string Interface::getName() const {

auto str = rtnl_link_get_name(nl_link);

return std::string(str);

}

Interface *Interface::getEgress(struct sockaddr *sa, SuperNode *sn) {

struct rtnl_link *link;

Logger logger = Log::get("kernel:if");

auto &interfaces = sn->getInterfaces();

auto affinity = sn->getAffinity();

// Determine outgoing interface

link = nl::get_egress_link(sa);

if (!link)

throw RuntimeError("Failed to get interface for socket address '{}'",

socket_print_addr(sa));

// Search of existing interface with correct ifindex

for (auto *i : interfaces) {

if (rtnl_link_get_ifindex(i->nl_link) == rtnl_link_get_ifindex(link))

return i;

}

// If not found, create a new interface

auto *i = new Interface(link, affinity);

if (!i)

throw MemoryAllocationError();

interfaces.push_back(i);

return i;

}

int Interface::getIRQs() {

int irq;

auto dirname = fmt::format("/sys/class/net/{}/device/msi_irqs/", getName());

DIR *dir = opendir(dirname.c_str());

if (dir) {

irqs.clear();

struct dirent *entry;

while ((entry = readdir(dir))) {

irq = atoi(entry->d_name);

if (irq)

irqs.push_back(irq);

}

closedir(dir);

}

return 0;

}

int Interface::setAffinity(int affinity) {

assert(affinity != 0);

if (getuid() != 0) {

logger->warn("Failed to tune IRQ affinity. Please run as super-user");

return 0;

}

FILE *file;

CpuSet cset_pin(affinity);

for (int irq : irqs) {

std::string filename = fmt::format("/proc/irq/{}/smp_affinity", irq);

file = fopen(filename.c_str(), "w");

if (file) {

if (fprintf(file, "%8lx", (unsigned long)cset_pin) < 0)

throw SystemError(

"Failed to set affinity for for IRQ {} on interface '{}'", irq,

getName());

fclose(file);

logger->debug("Set affinity of IRQ {} to {} {}", irq,

cset_pin.count() == 1 ? "core" : "cores",

(std::string)cset_pin);

} else

throw SystemError(

"Failed to set affinity for for IRQ {} on interface '{}'", irq,

getName());

}

return 0;

}

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Uh oh!

Sunbelt Computer Software

PL/B Language Development and Support

Uh oh!

FilesExpand file tree

if.cpp

Latest commit

History

if.cpp

File metadata and controls