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/*
* This file is open source software, licensed to you under the terms
* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. You may not use this file except in compliance with the License.
*
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include <bitset>
#include <rte_config.h>
#include <rte_common.h>
#include <rte_ethdev.h>
#include <rte_version.h>
#include "DPDK.h"
#include "dpdk_rte.h"
namespace dpdk {
static inline std::vector<char> string2vector(std::string str) {
auto v = std::vector<char>(str.begin(), str.end());
v.push_back('\0');
return v;
}
bool eal::initialized = false;
std::thread eal::t;
std::mutex eal::lock;
std::condition_variable eal::cond;
std::list<std::function<void()>> eal::funcs;
static int bitcount(unsigned long long n)
{
return std::bitset<CHAR_BIT * sizeof(n)>{n}.count();
}
static int hex2bitcount(unsigned char c)
{
int val;
if (isdigit(c))
val = c - '0';
else if (isupper(c))
val = c - 'A' + 10;
else
val = c - 'a' + 10;
return bitcount(val);
}
static int coremask_bitcount(const char *buf)
{
int count = 0;
if (buf[0] == '0' &&
((buf[1] == 'x') || (buf[1] == 'X')))
buf += 2;
for (int i = 0; buf[i] != '\0'; i++) {
char c = buf[i];
if (isxdigit(c) == 0)
return -EINVAL;
count += hex2bitcount(c);
}
return count;
}
int eal::init(CephContext *c)
{
if (initialized) {
return 1;
}
bool done = false;
auto coremask = c->_conf.get_val<std::string>("ms_dpdk_coremask");
int coremaskbit = coremask_bitcount(coremask.c_str());
if (coremaskbit <= 0
|| static_cast<uint64_t>(coremaskbit) < c->_conf->ms_async_op_threads)
return -EINVAL;
t = std::thread([&]() {
// TODO: Inherit these from the app parameters - "opts"
std::vector<std::vector<char>> args {
string2vector(string("ceph")),
string2vector("-c"), string2vector(c->_conf.get_val<std::string>("ms_dpdk_coremask")),
string2vector("-n"), string2vector(c->_conf->ms_dpdk_memory_channel),
};
Tub<std::string> hugepages_path;
if (!c->_conf->ms_dpdk_hugepages.empty()) {
hugepages_path.construct(c->_conf->ms_dpdk_hugepages);
}
// If "hugepages" is not provided and DPDK PMD drivers mode is requested -
// use the default DPDK huge tables configuration.
if (hugepages_path) {
args.push_back(string2vector("--huge-dir"));
args.push_back(string2vector(*hugepages_path));
//
// We don't know what is going to be our networking configuration so we
// assume there is going to be a queue per-CPU. Plus we'll give a DPDK
// 64MB for "other stuff".
//
unsigned int x;
std::stringstream ss;
ss << std::hex << "fffefffe";
ss >> x;
size_t size_MB = mem_size(bitcount(x)) >> 20;
std::stringstream size_MB_str;
size_MB_str << size_MB;
args.push_back(string2vector("-m"));
args.push_back(string2vector(size_MB_str.str()));
} else if (!c->_conf->ms_dpdk_pmd.empty()) {
args.push_back(string2vector("--no-huge"));
}
std::string rte_file_prefix;
rte_file_prefix = "rte_";
rte_file_prefix += c->_conf->name.to_str();
args.push_back(string2vector("--file-prefix"));
args.push_back(string2vector(rte_file_prefix));
std::vector<char*> cargs;
for (auto&& a: args) {
cargs.push_back(a.data());
}
/* initialise the EAL for all */
int ret = rte_eal_init(cargs.size(), cargs.data());
if (ret < 0)
return ret;
std::unique_lock<std::mutex> l(lock);
initialized = true;
done = true;
cond.notify_all();
while (true) {
if (!funcs.empty()) {
auto f = std::move(funcs.front());
funcs.pop_front();
f();
cond.notify_all();
} else {
cond.wait(l);
}
}
});
t.detach();
std::unique_lock<std::mutex> l(lock);
while (!done)
cond.wait(l);
return 0;
}
size_t eal::mem_size(int num_cpus)
{
size_t memsize = 0;
//
// PMD mempool memory:
//
// We don't know what is going to be our networking configuration so we
// assume there is going to be a queue per-CPU.
//
memsize += num_cpus * qp_mempool_obj_size();
// Plus we'll give a DPDK 64MB for "other stuff".
memsize += (64UL << 20);
return memsize;
}
} // namespace dpdk
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