+++ /dev/null
-// -*- 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>
- *
- * This is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software
- * Foundation. See file COPYING.
- *
- */
-
-#include "common/perf_counters.h"
-
-#include "capture.h"
-#include "IP.h"
-#include "shared_ptr.h"
-#include "toeplitz.h"
-
-#include "common/dout.h"
-#include "include/assert.h"
-
-#define dout_subsys ceph_subsys_dpdk
-#undef dout_prefix
-#define dout_prefix *_dout << "dpdk "
-
-std::ostream& operator<<(std::ostream& os, const ipv4_address& a) {
- auto ip = a.ip;
- return os << ((ip >> 24) & 0xff) << "." << ((ip >> 16) & 0xff)
- << "." << ((ip >> 8) & 0xff) << "." << ((ip >> 0) & 0xff);
-}
-
-utime_t ipv4::_frag_timeout = utime_t(30, 0);
-constexpr uint32_t ipv4::_frag_low_thresh;
-constexpr uint32_t ipv4::_frag_high_thresh;
-
-class C_handle_frag_timeout : public EventCallback {
- ipv4 *_ipv4;
-
- public:
- C_handle_frag_timeout(ipv4 *i): _ipv4(i) {}
- void do_request(int fd_or_id) {
- _ipv4->frag_timeout();
- }
-};
-
-enum {
- l_dpdk_qp_first = 99000,
- l_dpdk_total_linearize_operations,
- l_dpdk_qp_last
-};
-
-ipv4::ipv4(CephContext *c, EventCenter *cen, interface* netif)
- : cct(c), center(cen), _netif(netif), _global_arp(netif),
- _arp(c, _global_arp, cen),
- _host_address(0), _gw_address(0), _netmask(0),
- _l3(netif, eth_protocol_num::ipv4, [this] { return get_packet(); }),
- _rx_packets(
- _l3.receive(
- [this] (Packet p, ethernet_address ea) {
- return handle_received_packet(std::move(p), ea);
- },
- [this] (forward_hash& out_hash_data, Packet& p, size_t off) {
- return forward(out_hash_data, p, off);
- }
- )
- ),
- _tcp(*this, cen), _icmp(c, *this),
- _l4({{ uint8_t(ip_protocol_num::tcp), &_tcp },
- { uint8_t(ip_protocol_num::icmp), &_icmp }}),
- _packet_filter(nullptr)
-{
- PerfCountersBuilder plb(cct, "ipv4", l_dpdk_qp_first, l_dpdk_qp_last);
- plb.add_u64_counter(l_dpdk_total_linearize_operations, "dpdk_ip_linearize_operations", "DPDK IP Packet linearization operations");
- perf_logger = plb.create_perf_counters();
- cct->get_perfcounters_collection()->add(perf_logger);
- frag_handler = new C_handle_frag_timeout(this);
-}
-
-bool ipv4::forward(forward_hash& out_hash_data, Packet& p, size_t off)
-{
- auto iph = p.get_header<ip_hdr>(off);
-
- out_hash_data.push_back(iph->src_ip.ip);
- out_hash_data.push_back(iph->dst_ip.ip);
-
- auto h = iph->ntoh();
- auto l4 = _l4[h.ip_proto];
- if (l4) {
- if (h.mf() == false && h.offset() == 0) {
- // This IP datagram is atomic, forward according to tcp connection hash
- l4->forward(out_hash_data, p, off + sizeof(ip_hdr));
- }
- // else forward according to ip fields only
- }
- return true;
-}
-
-int ipv4::handle_received_packet(Packet p, ethernet_address from)
-{
- auto iph = p.get_header<ip_hdr>(0);
- if (!iph) {
- return 0;
- }
-
- // Skip checking csum of reassembled IP datagram
- if (!get_hw_features().rx_csum_offload && !p.offload_info_ref().reassembled) {
- checksummer csum;
- csum.sum(reinterpret_cast<char*>(iph), sizeof(*iph));
- if (csum.get() != 0) {
- return 0;
- }
- }
-
- auto h = iph->ntoh();
- unsigned ip_len = h.len;
- unsigned ip_hdr_len = h.ihl * 4;
- unsigned pkt_len = p.len();
- auto offset = h.offset();
-
- ldout(cct, 10) << __func__ << " get " << std::hex << int(h.ip_proto)
- << std::dec << " packet from "
- << h.src_ip << " -> " << h.dst_ip << " id=" << h.id
- << " ip_len=" << ip_len << " ip_hdr_len=" << ip_hdr_len
- << " pkt_len=" << pkt_len << " offset=" << offset << dendl;
-
- if (pkt_len > ip_len) {
- // Trim extra data in the packet beyond IP total length
- p.trim_back(pkt_len - ip_len);
- } else if (pkt_len < ip_len) {
- // Drop if it contains less than IP total length
- return 0;
- }
- // Drop if the reassembled datagram will be larger than maximum IP size
- if (offset + p.len() > ip_packet_len_max) {
- return 0;
- }
-
- // FIXME: process options
- if (in_my_netmask(h.src_ip) && h.src_ip != _host_address) {
- ldout(cct, 20) << __func__ << " learn mac " << from << " with " << h.src_ip << dendl;
- _arp.learn(from, h.src_ip);
- }
-
- if (_packet_filter) {
- bool handled = false;
- _packet_filter->handle(p, &h, from, handled);
- if (handled) {
- return 0;
- }
- }
-
- if (h.dst_ip != _host_address) {
- // FIXME: forward
- return 0;
- }
-
- // Does this IP datagram need reassembly
- auto mf = h.mf();
- if (mf == true || offset != 0) {
- frag_limit_mem();
- auto frag_id = ipv4_frag_id{h.src_ip, h.dst_ip, h.id, h.ip_proto};
- auto& frag = _frags[frag_id];
- if (mf == false) {
- frag.last_frag_received = true;
- }
- // This is a newly created frag_id
- if (frag.mem_size == 0) {
- _frags_age.push_back(frag_id);
- frag.rx_time = ceph_clock_now();
- }
- auto added_size = frag.merge(h, offset, std::move(p));
- _frag_mem += added_size;
- if (frag.is_complete()) {
- // All the fragments are received
- auto dropped_size = frag.mem_size;
- auto& ip_data = frag.data.map.begin()->second;
- // Choose a cpu to forward this packet
- auto cpu_id = center->get_id();
- auto l4 = _l4[h.ip_proto];
- if (l4) {
- size_t l4_offset = 0;
- forward_hash hash_data;
- hash_data.push_back(hton(h.src_ip.ip));
- hash_data.push_back(hton(h.dst_ip.ip));
- l4->forward(hash_data, ip_data, l4_offset);
- cpu_id = _netif->hash2cpu(toeplitz_hash(_netif->rss_key(), hash_data));
- }
-
- // No need to forward if the dst cpu is the current cpu
- if (cpu_id == center->get_id()) {
- l4->received(std::move(ip_data), h.src_ip, h.dst_ip);
- } else {
- auto to = _netif->hw_address();
- auto pkt = frag.get_assembled_packet(from, to);
- _netif->forward(center, cpu_id, std::move(pkt));
- }
-
- // Delete this frag from _frags and _frags_age
- frag_drop(frag_id, dropped_size);
- _frags_age.remove(frag_id);
- perf_logger->set(l_dpdk_total_linearize_operations,
- ipv4_packet_merger::linearizations());
- } else {
- // Some of the fragments are missing
- if (frag_timefd) {
- frag_arm();
- }
- }
- return 0;
- }
-
- auto l4 = _l4[h.ip_proto];
- if (l4) {
- // Trim IP header and pass to upper layer
- p.trim_front(ip_hdr_len);
- l4->received(std::move(p), h.src_ip, h.dst_ip);
- }
- return 0;
-}
-
-void ipv4::wait_l2_dst_address(ipv4_address to, Packet p, resolution_cb cb) {
- // Figure out where to send the packet to. If it is a directly connected
- // host, send to it directly, otherwise send to the default gateway.
- ipv4_address dst;
- if (in_my_netmask(to)) {
- dst = to;
- } else {
- dst = _gw_address;
- }
-
- _arp.wait(std::move(dst), std::move(p), std::move(cb));
-}
-
-const hw_features& ipv4::get_hw_features() const
-{
- return _netif->get_hw_features();
-}
-
-void ipv4::send(ipv4_address to, ip_protocol_num proto_num,
- Packet p, ethernet_address e_dst) {
- auto needs_frag = this->needs_frag(p, proto_num, get_hw_features());
-
- auto send_pkt = [this, to, proto_num, needs_frag, e_dst] (Packet& pkt, uint16_t remaining, uint16_t offset) mutable {
- static uint16_t id = 0;
- auto iph = pkt.prepend_header<ip_hdr>();
- iph->ihl = sizeof(*iph) / 4;
- iph->ver = 4;
- iph->dscp = 0;
- iph->ecn = 0;
- iph->len = pkt.len();
- // FIXME: a proper id
- iph->id = id++;
- if (needs_frag) {
- uint16_t mf = remaining > 0;
- // The fragment offset is measured in units of 8 octets (64 bits)
- auto off = offset / 8;
- iph->frag = (mf << uint8_t(ip_hdr::frag_bits::mf)) | off;
- } else {
- iph->frag = 0;
- }
- iph->ttl = 64;
- iph->ip_proto = (uint8_t)proto_num;
- iph->csum = 0;
- iph->src_ip = _host_address;
- iph->dst_ip = to;
- ldout(cct, 20) << " ipv4::send " << " id=" << iph->id << " " << _host_address << " -> " << to
- << " len " << pkt.len() << dendl;
- *iph = iph->hton();
-
- if (get_hw_features().tx_csum_ip_offload) {
- iph->csum = 0;
- pkt.offload_info_ref().needs_ip_csum = true;
- } else {
- checksummer csum;
- csum.sum(reinterpret_cast<char*>(iph), sizeof(*iph));
- iph->csum = csum.get();
- }
-
- _packetq.push_back(
- l3_protocol::l3packet{eth_protocol_num::ipv4, e_dst, std::move(pkt)});
- };
-
- if (needs_frag) {
- uint16_t offset = 0;
- uint16_t remaining = p.len();
- auto mtu = get_hw_features().mtu;
-
- while (remaining) {
- auto can_send = std::min(uint16_t(mtu - ipv4_hdr_len_min), remaining);
- remaining -= can_send;
- auto pkt = p.share(offset, can_send);
- send_pkt(pkt, remaining, offset);
- offset += can_send;
- }
- } else {
- // The whole packet can be send in one shot
- send_pkt(p, 0, 0);
- }
-}
-
-Tub<l3_protocol::l3packet> ipv4::get_packet() {
- // _packetq will be mostly empty here unless it hold remnants of previously
- // fragmented packet
- if (_packetq.empty()) {
- for (size_t i = 0; i < _pkt_providers.size(); i++) {
- auto l4p = _pkt_providers[_pkt_provider_idx++]();
- if (_pkt_provider_idx == _pkt_providers.size()) {
- _pkt_provider_idx = 0;
- }
- if (l4p) {
- ldout(cct, 20) << " ipv4::get_packet len " << l4p->p.len() << dendl;
- send(l4p->to, l4p->proto_num, std::move(l4p->p), l4p->e_dst);
- break;
- }
- }
- }
-
- Tub<l3_protocol::l3packet> p;
- if (!_packetq.empty()) {
- p = std::move(_packetq.front());
- _packetq.pop_front();
- }
- return p;
-}
-
-void ipv4::frag_limit_mem() {
- if (_frag_mem <= _frag_high_thresh) {
- return;
- }
- auto drop = _frag_mem - _frag_low_thresh;
- while (drop) {
- if (_frags_age.empty()) {
- return;
- }
- // Drop the oldest frag (first element) from _frags_age
- auto frag_id = _frags_age.front();
- _frags_age.pop_front();
-
- // Drop from _frags as well
- auto& frag = _frags[frag_id];
- auto dropped_size = frag.mem_size;
- frag_drop(frag_id, dropped_size);
-
- drop -= std::min(drop, dropped_size);
- }
-}
-
-void ipv4::frag_timeout() {
- if (_frags.empty()) {
- return;
- }
- auto now = ceph_clock_now();
- for (auto it = _frags_age.begin(); it != _frags_age.end();) {
- auto frag_id = *it;
- auto& frag = _frags[frag_id];
- if (now > frag.rx_time + _frag_timeout) {
- auto dropped_size = frag.mem_size;
- // Drop from _frags
- frag_drop(frag_id, dropped_size);
- // Drop from _frags_age
- it = _frags_age.erase(it);
- } else {
- // The further items can only be younger
- break;
- }
- }
- if (_frags.size() != 0) {
- frag_arm(now);
- } else {
- _frag_mem = 0;
- }
-}
-
-int32_t ipv4::frag::merge(ip_hdr &h, uint16_t offset, Packet p) {
- uint32_t old = mem_size;
- unsigned ip_hdr_len = h.ihl * 4;
- // Store IP header
- if (offset == 0) {
- header = p.share(0, ip_hdr_len);
- }
- // Sotre IP payload
- p.trim_front(ip_hdr_len);
- data.merge(offset, std::move(p));
- // Update mem size
- mem_size = header.memory();
- for (const auto& x : data.map) {
- mem_size += x.second.memory();
- }
- auto added_size = mem_size - old;
- return added_size;
-}
-
-bool ipv4::frag::is_complete() {
- // If all the fragments are received, ipv4::frag::merge() should merge all
- // the fragments into a single packet
- auto offset = data.map.begin()->first;
- auto nr_packet = data.map.size();
- return last_frag_received && nr_packet == 1 && offset == 0;
-}
-
-Packet ipv4::frag::get_assembled_packet(ethernet_address from, ethernet_address to) {
- auto& ip_header = header;
- auto& ip_data = data.map.begin()->second;
- // Append a ethernet header, needed for forwarding
- auto eh = ip_header.prepend_header<eth_hdr>();
- eh->src_mac = from;
- eh->dst_mac = to;
- eh->eth_proto = uint16_t(eth_protocol_num::ipv4);
- *eh = eh->hton();
- // Prepare a packet contains both ethernet header, ip header and ip data
- ip_header.append(std::move(ip_data));
- auto pkt = std::move(ip_header);
- auto iph = pkt.get_header<ip_hdr>(sizeof(eth_hdr));
- // len is the sum of each fragment
- iph->len = hton(uint16_t(pkt.len() - sizeof(eth_hdr)));
- // No fragmentation for the assembled datagram
- iph->frag = 0;
- // Since each fragment's csum is checked, no need to csum
- // again for the assembled datagram
- offload_info oi;
- oi.reassembled = true;
- pkt.set_offload_info(oi);
- return pkt;
-}
-
-void icmp::received(Packet p, ipaddr from, ipaddr to) {
- auto hdr = p.get_header<icmp_hdr>(0);
- if (!hdr || hdr->type != icmp_hdr::msg_type::echo_request) {
- return;
- }
- hdr->type = icmp_hdr::msg_type::echo_reply;
- hdr->code = 0;
- hdr->csum = 0;
- checksummer csum;
- csum.sum(reinterpret_cast<char*>(hdr), p.len());
- hdr->csum = csum.get();
-
- if (_queue_space.get_or_fail(p.len())) { // drop packets that do not fit the queue
- auto cb = [this, from] (const ethernet_address e_dst, Packet p, int r) mutable {
- if (r == 0) {
- _packetq.emplace_back(ipv4_traits::l4packet{from, std::move(p), e_dst, ip_protocol_num::icmp});
- }
- };
- _inet.wait_l2_dst_address(from, std::move(p), cb);
- }
-}
Code Review / stor4nfv.git / blobdiff