--- /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