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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
/*
* 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.
*/
/*
* Copyright (C) 2014 Cloudius Systems, Ltd.
*/
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2015 XSky <haomai@xsky.com>
*
* Author: Haomai Wang <haomaiwang@gmail.com>
*
*/
#include "net.h"
#include "DPDK.h"
#include "DPDKStack.h"
#include "common/dout.h"
#include "include/ceph_assert.h"
#define dout_subsys ceph_subsys_dpdk
#undef dout_prefix
#define dout_prefix *_dout << "net "
interface::interface(CephContext *cct, std::shared_ptr<DPDKDevice> dev, EventCenter *center)
: cct(cct), _dev(dev),
_rx(_dev->receive(
center->get_id(),
[center, this] (Packet p) {
return dispatch_packet(center, std::move(p));
}
)),
_hw_address(_dev->hw_address()),
_hw_features(_dev->get_hw_features()) {
auto idx = 0u;
unsigned qid = center->get_id();
dev->queue_for_cpu(center->get_id()).register_packet_provider([this, idx, qid] () mutable {
std::optional<Packet> p;
for (size_t i = 0; i < _pkt_providers.size(); i++) {
auto l3p = _pkt_providers[idx++]();
if (idx == _pkt_providers.size())
idx = 0;
if (l3p) {
auto l3pv = std::move(*l3p);
auto eh = l3pv.p.prepend_header<eth_hdr>();
eh->dst_mac = l3pv.to;
eh->src_mac = _hw_address;
eh->eth_proto = uint16_t(l3pv.proto_num);
*eh = eh->hton();
ldout(this->cct, 10) << "=== tx === proto " << std::hex << uint16_t(l3pv.proto_num)
<< " " << _hw_address << " -> " << l3pv.to
<< " length " << std::dec << l3pv.p.len() << dendl;
p = std::move(l3pv.p);
return p;
}
}
return p;
});
}
subscription<Packet, ethernet_address> interface::register_l3(
eth_protocol_num proto_num,
std::function<int (Packet p, ethernet_address from)> next,
std::function<bool (forward_hash&, Packet& p, size_t)> forward)
{
auto i = _proto_map.emplace(std::piecewise_construct, std::make_tuple(uint16_t(proto_num)), std::forward_as_tuple(std::move(forward)));
ceph_assert(i.second);
l3_rx_stream& l3_rx = i.first->second;
return l3_rx.packet_stream.listen(std::move(next));
}
unsigned interface::hash2cpu(uint32_t hash) {
return _dev->hash2cpu(hash);
}
const rss_key_type& interface::rss_key() const {
return _dev->rss_key();
}
uint16_t interface::hw_queues_count() const {
return _dev->hw_queues_count();
}
class C_handle_l2forward : public EventCallback {
std::shared_ptr<DPDKDevice> sdev;
unsigned &queue_depth;
Packet p;
unsigned dst;
public:
C_handle_l2forward(std::shared_ptr<DPDKDevice> &p, unsigned &qd, Packet pkt, unsigned target)
: sdev(p), queue_depth(qd), p(std::move(pkt)), dst(target) {}
void do_request(uint64_t fd) {
sdev->l2receive(dst, std::move(p));
queue_depth--;
delete this;
}
};
void interface::forward(EventCenter *source, unsigned target, Packet p) {
static __thread unsigned queue_depth;
if (queue_depth < 1000) {
queue_depth++;
// FIXME: need ensure this event not be called after EventCenter destruct
_dev->workers[target]->center.dispatch_event_external(
new C_handle_l2forward(_dev, queue_depth, std::move(p.free_on_cpu(source)), target));
}
}
int interface::dispatch_packet(EventCenter *center, Packet p) {
auto eh = p.get_header<eth_hdr>();
if (eh) {
auto i = _proto_map.find(ntoh(eh->eth_proto));
auto hwrss = p.rss_hash();
if (hwrss) {
ldout(cct, 10) << __func__ << " === rx === proto " << std::hex << ::ntoh(eh->eth_proto)
<< " "<< eh->src_mac.ntoh() << " -> " << eh->dst_mac.ntoh()
<< " length " << std::dec << p.len() << " rss_hash " << *p.rss_hash() << dendl;
} else {
ldout(cct, 10) << __func__ << " === rx === proto " << std::hex << ::ntoh(eh->eth_proto)
<< " "<< eh->src_mac.ntoh() << " -> " << eh->dst_mac.ntoh()
<< " length " << std::dec << p.len() << dendl;
}
if (i != _proto_map.end()) {
l3_rx_stream& l3 = i->second;
auto fw = _dev->forward_dst(center->get_id(), [&p, &l3, this] () {
auto hwrss = p.rss_hash();
if (hwrss) {
return *hwrss;
} else {
forward_hash data;
if (l3.forward(data, p, sizeof(eth_hdr))) {
return toeplitz_hash(rss_key(), data);
}
return 0u;
}
});
if (fw != center->get_id()) {
ldout(cct, 1) << __func__ << " forward to " << fw << dendl;
forward(center, fw, std::move(p));
} else {
auto h = eh->ntoh();
auto from = h.src_mac;
p.trim_front(sizeof(*eh));
// avoid chaining, since queue length is unlimited
// drop instead.
if (l3.ready()) {
return l3.packet_stream.produce(std::move(p), from);
}
}
}
}
return 0;
}
class C_arp_learn : public EventCallback {
DPDKWorker *worker;
ethernet_address l2_addr;
ipv4_address l3_addr;
public:
C_arp_learn(DPDKWorker *w, ethernet_address l2, ipv4_address l3)
: worker(w), l2_addr(l2), l3_addr(l3) {}
void do_request(uint64_t id) {
worker->arp_learn(l2_addr, l3_addr);
delete this;
}
};
void interface::arp_learn(ethernet_address l2, ipv4_address l3)
{
for (auto &&w : _dev->workers) {
w->center.dispatch_event_external(
new C_arp_learn(w, l2, l3));
}
}
l3_protocol::l3_protocol(interface* netif, eth_protocol_num proto_num, packet_provider_type func)
: _netif(netif), _proto_num(proto_num) {
_netif->register_packet_provider(std::move(func));
}
subscription<Packet, ethernet_address> l3_protocol::receive(
std::function<int (Packet, ethernet_address)> rx_fn,
std::function<bool (forward_hash &h, Packet &p, size_t s)> forward) {
return _netif->register_l3(_proto_num, std::move(rx_fn), std::move(forward));
};
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