1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
3 * This file is open source software, licensed to you under the terms
4 * of the Apache License, Version 2.0 (the "License"). See the NOTICE file
5 * distributed with this work for additional information regarding copyright
6 * ownership. You may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
20 * Copyright (C) 2014 Cloudius Systems, Ltd.
23 * Ceph - scalable distributed file system
25 * Copyright (C) 2015 XSky <haomai@xsky.com>
27 * Author: Haomai Wang <haomaiwang@gmail.com>
29 * This is free software; you can redistribute it and/or
30 * modify it under the terms of the GNU Lesser General Public
31 * License version 2.1, as published by the Free Software
32 * Foundation. See file COPYING.
40 #include <rte_config.h>
41 #include <rte_common.h>
44 #include <rte_ethdev.h>
45 #include <rte_cycles.h>
46 #include <rte_memzone.h>
48 #include "include/page.h"
56 #include "common/Cycles.h"
57 #include "common/dout.h"
58 #include "common/errno.h"
59 #include "include/assert.h"
61 #define dout_subsys ceph_subsys_dpdk
63 #define dout_prefix *_dout << "dpdk "
66 void* as_cookie(struct rte_pktmbuf_pool_private& p) {
71 typedef void *MARKER[0]; /**< generic marker for a point in a structure */
74 /******************* Net device related constatns *****************************/
75 static constexpr uint16_t default_ring_size = 512;
78 // We need 2 times the ring size of buffers because of the way PMDs
81 static constexpr uint16_t mbufs_per_queue_rx = 2 * default_ring_size;
82 static constexpr uint16_t rx_gc_thresh = 64;
85 // No need to keep more descriptors in the air than can be sent in a single
86 // rte_eth_tx_burst() call.
88 static constexpr uint16_t mbufs_per_queue_tx = 2 * default_ring_size;
90 static constexpr uint16_t mbuf_cache_size = 512;
91 static constexpr uint16_t mbuf_overhead =
92 sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM;
94 // We'll allocate 2K data buffers for an inline case because this would require
95 // a single page per mbuf. If we used 4K data buffers here it would require 2
96 // pages for a single buffer (due to "mbuf_overhead") and this is a much more
97 // demanding memory constraint.
99 static constexpr size_t inline_mbuf_data_size = 2048;
102 // Size of the data buffer in the non-inline case.
104 // We may want to change (increase) this value in future, while the
105 // inline_mbuf_data_size value will unlikely change due to reasons described
108 static constexpr size_t mbuf_data_size = 4096;
110 // (INLINE_MBUF_DATA_SIZE(2K)*32 = 64K = Max TSO/LRO size) + 1 mbuf for headers
111 static constexpr uint8_t max_frags = 32 + 1;
114 // Intel's 40G NIC HW limit for a number of fragments in an xmit segment.
116 // See Chapter 8.4.1 "Transmit Packet in System Memory" of the xl710 devices
117 // spec. for more details.
119 static constexpr uint8_t i40e_max_xmit_segment_frags = 8;
122 // VMWare's virtual NIC limit for a number of fragments in an xmit segment.
124 // see drivers/net/vmxnet3/base/vmxnet3_defs.h VMXNET3_MAX_TXD_PER_PKT
126 static constexpr uint8_t vmxnet3_max_xmit_segment_frags = 16;
128 static constexpr uint16_t inline_mbuf_size = inline_mbuf_data_size + mbuf_overhead;
130 static size_t huge_page_size = 512 * CEPH_PAGE_SIZE;
132 uint32_t qp_mempool_obj_size()
134 uint32_t mp_size = 0;
135 struct rte_mempool_objsz mp_obj_sz = {};
138 // We will align each size to huge page size because DPDK allocates
139 // physically contiguous memory region for each pool object.
143 mp_size += align_up(rte_mempool_calc_obj_size(mbuf_overhead, 0, &mp_obj_sz)+
144 sizeof(struct rte_pktmbuf_pool_private),
148 std::memset(&mp_obj_sz, 0, sizeof(mp_obj_sz));
149 mp_size += align_up(rte_mempool_calc_obj_size(inline_mbuf_size, 0,
151 sizeof(struct rte_pktmbuf_pool_private),
156 static constexpr const char* pktmbuf_pool_name = "dpdk_net_pktmbuf_pool";
159 * When doing reads from the NIC queues, use this batch size
161 static constexpr uint8_t packet_read_size = 32;
162 /******************************************************************************/
164 int DPDKDevice::init_port_start()
166 assert(_port_idx < rte_eth_dev_count());
168 rte_eth_dev_info_get(_port_idx, &_dev_info);
171 // This is a workaround for a missing handling of a HW limitation in the
172 // DPDK i40e driver. This and all related to _is_i40e_device code should be
173 // removed once this handling is added.
175 if (std::string("rte_i40evf_pmd") == _dev_info.driver_name ||
176 std::string("rte_i40e_pmd") == _dev_info.driver_name) {
177 ldout(cct, 1) << __func__ << " Device is an Intel's 40G NIC. Enabling 8 fragments hack!" << dendl;
178 _is_i40e_device = true;
181 if (std::string("rte_vmxnet3_pmd") == _dev_info.driver_name) {
182 ldout(cct, 1) << __func__ << " Device is a VMWare Virtual NIC. Enabling 16 fragments hack!" << dendl;
183 _is_vmxnet3_device = true;
187 // Another workaround: this time for a lack of number of RSS bits.
188 // ixgbe PF NICs support up to 16 RSS queues.
189 // ixgbe VF NICs support up to 4 RSS queues.
190 // i40e PF NICs support up to 64 RSS queues.
191 // i40e VF NICs support up to 16 RSS queues.
193 if (std::string("rte_ixgbe_pmd") == _dev_info.driver_name) {
194 _dev_info.max_rx_queues = std::min(_dev_info.max_rx_queues, (uint16_t)16);
195 } else if (std::string("rte_ixgbevf_pmd") == _dev_info.driver_name) {
196 _dev_info.max_rx_queues = std::min(_dev_info.max_rx_queues, (uint16_t)4);
197 } else if (std::string("rte_i40e_pmd") == _dev_info.driver_name) {
198 _dev_info.max_rx_queues = std::min(_dev_info.max_rx_queues, (uint16_t)64);
199 } else if (std::string("rte_i40evf_pmd") == _dev_info.driver_name) {
200 _dev_info.max_rx_queues = std::min(_dev_info.max_rx_queues, (uint16_t)16);
203 // Clear txq_flags - we want to support all available offload features
204 // except for multi-mempool and refcnt'ing which we don't need
205 _dev_info.default_txconf.txq_flags =
206 ETH_TXQ_FLAGS_NOMULTMEMP | ETH_TXQ_FLAGS_NOREFCOUNT;
209 // Disable features that are not supported by port's HW
211 if (!(_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_UDP_CKSUM)) {
212 _dev_info.default_txconf.txq_flags |= ETH_TXQ_FLAGS_NOXSUMUDP;
215 if (!(_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_TCP_CKSUM)) {
216 _dev_info.default_txconf.txq_flags |= ETH_TXQ_FLAGS_NOXSUMTCP;
219 if (!(_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_SCTP_CKSUM)) {
220 _dev_info.default_txconf.txq_flags |= ETH_TXQ_FLAGS_NOXSUMSCTP;
223 if (!(_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_VLAN_INSERT)) {
224 _dev_info.default_txconf.txq_flags |= ETH_TXQ_FLAGS_NOVLANOFFL;
227 if (!(_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_VLAN_INSERT)) {
228 _dev_info.default_txconf.txq_flags |= ETH_TXQ_FLAGS_NOVLANOFFL;
231 if (!(_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_TCP_TSO)) {
232 _dev_info.default_txconf.txq_flags |= ETH_TXQ_FLAGS_NOMULTSEGS;
235 /* for port configuration all features are off by default */
236 rte_eth_conf port_conf = { 0 };
238 ldout(cct, 5) << __func__ << " Port " << int(_port_idx) << ": max_rx_queues "
239 << _dev_info.max_rx_queues << " max_tx_queues "
240 << _dev_info.max_tx_queues << dendl;
242 _num_queues = std::min({_num_queues, _dev_info.max_rx_queues, _dev_info.max_tx_queues});
244 ldout(cct, 5) << __func__ << " Port " << int(_port_idx) << ": using "
245 << _num_queues << " queues" << dendl;;
247 // Set RSS mode: enable RSS if seastar is configured with more than 1 CPU.
248 // Even if port has a single queue we still want the RSS feature to be
249 // available in order to make HW calculate RSS hash for us.
250 if (_num_queues > 1) {
251 if (_dev_info.hash_key_size == 40) {
252 _rss_key = default_rsskey_40bytes;
253 } else if (_dev_info.hash_key_size == 52) {
254 _rss_key = default_rsskey_52bytes;
255 } else if (_dev_info.hash_key_size != 0) {
257 rte_exit(EXIT_FAILURE,
258 "Port %d: We support only 40 or 52 bytes RSS hash keys, %d bytes key requested",
259 _port_idx, _dev_info.hash_key_size);
261 _rss_key = default_rsskey_40bytes;
262 _dev_info.hash_key_size = 40;
265 port_conf.rxmode.mq_mode = ETH_MQ_RX_RSS;
266 port_conf.rx_adv_conf.rss_conf.rss_hf = ETH_RSS_PROTO_MASK;
267 if (_dev_info.hash_key_size) {
268 port_conf.rx_adv_conf.rss_conf.rss_key = const_cast<uint8_t *>(_rss_key.data());
269 port_conf.rx_adv_conf.rss_conf.rss_key_len = _dev_info.hash_key_size;
272 port_conf.rxmode.mq_mode = ETH_MQ_RX_NONE;
275 if (_num_queues > 1) {
276 if (_dev_info.reta_size) {
277 // RETA size should be a power of 2
278 assert((_dev_info.reta_size & (_dev_info.reta_size - 1)) == 0);
280 // Set the RSS table to the correct size
281 _redir_table.resize(_dev_info.reta_size);
282 _rss_table_bits = std::lround(std::log2(_dev_info.reta_size));
283 ldout(cct, 5) << __func__ << " Port " << int(_port_idx)
284 << ": RSS table size is " << _dev_info.reta_size << dendl;
286 // FIXME: same with sw_reta
287 _redir_table.resize(128);
288 _rss_table_bits = std::lround(std::log2(128));
291 _redir_table.push_back(0);
294 // Set Rx VLAN stripping
295 if (_dev_info.rx_offload_capa & DEV_RX_OFFLOAD_VLAN_STRIP) {
296 port_conf.rxmode.hw_vlan_strip = 1;
299 // Enable HW CRC stripping
300 port_conf.rxmode.hw_strip_crc = 1;
302 #ifdef RTE_ETHDEV_HAS_LRO_SUPPORT
304 if (_use_lro && (_dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_LRO)) {
305 ldout(cct, 1) << __func__ << " LRO is on" << dendl;
306 port_conf.rxmode.enable_lro = 1;
307 _hw_features.rx_lro = true;
310 ldout(cct, 1) << __func__ << " LRO is off" << dendl;
312 // Check that all CSUM features are either all set all together or not set
313 // all together. If this assumption breaks we need to rework the below logic
314 // by splitting the csum offload feature bit into separate bits for IPv4,
316 assert(((_dev_info.rx_offload_capa & DEV_RX_OFFLOAD_IPV4_CKSUM) &&
317 (_dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_CKSUM)) ||
318 (!(_dev_info.rx_offload_capa & DEV_RX_OFFLOAD_IPV4_CKSUM) &&
319 !(_dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_CKSUM)));
321 // Set Rx checksum checking
322 if ((_dev_info.rx_offload_capa & DEV_RX_OFFLOAD_IPV4_CKSUM) &&
323 (_dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_CKSUM)) {
324 ldout(cct, 1) << __func__ << " RX checksum offload supported" << dendl;
325 port_conf.rxmode.hw_ip_checksum = 1;
326 _hw_features.rx_csum_offload = 1;
329 if ((_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_IPV4_CKSUM)) {
330 ldout(cct, 1) << __func__ << " TX ip checksum offload supported" << dendl;
331 _hw_features.tx_csum_ip_offload = 1;
334 // TSO is supported starting from DPDK v1.8
335 if (_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_TCP_TSO) {
336 ldout(cct, 1) << __func__ << " TSO is supported" << dendl;
337 _hw_features.tx_tso = 1;
340 // Check that Tx TCP CSUM features are either all set all together
341 // or not set all together. If this assumption breaks we need to rework the
342 // below logic by splitting the csum offload feature bit into separate bits
344 assert((_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_TCP_CKSUM) ||
345 !(_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_TCP_CKSUM));
347 if (_dev_info.tx_offload_capa & DEV_TX_OFFLOAD_TCP_CKSUM) {
348 ldout(cct, 1) << __func__ << " TX TCP checksum offload supported" << dendl;
349 _hw_features.tx_csum_l4_offload = 1;
354 ldout(cct, 1) << __func__ << " Port " << int(_port_idx) << " init ... " << dendl;
357 * Standard DPDK port initialisation - config port, then set up
360 if ((retval = rte_eth_dev_configure(_port_idx, _num_queues, _num_queues,
362 lderr(cct) << __func__ << " failed to configure port " << (int)_port_idx
363 << " rx/tx queues " << _num_queues << " error " << cpp_strerror(retval) << dendl;
367 //rte_eth_promiscuous_enable(port_num);
368 ldout(cct, 1) << __func__ << " done." << dendl;
373 void DPDKDevice::set_hw_flow_control()
375 // Read the port's current/default flow control settings
376 struct rte_eth_fc_conf fc_conf;
377 auto ret = rte_eth_dev_flow_ctrl_get(_port_idx, &fc_conf);
379 if (ret == -ENOTSUP) {
380 ldout(cct, 1) << __func__ << " port " << int(_port_idx)
381 << ": not support to get hardware flow control settings: " << ret << dendl;
386 lderr(cct) << __func__ << " port " << int(_port_idx)
387 << ": failed to get hardware flow control settings: " << ret << dendl;
392 fc_conf.mode = RTE_FC_FULL;
394 fc_conf.mode = RTE_FC_NONE;
397 ret = rte_eth_dev_flow_ctrl_set(_port_idx, &fc_conf);
398 if (ret == -ENOTSUP) {
399 ldout(cct, 1) << __func__ << " port " << int(_port_idx)
400 << ": not support to set hardware flow control settings: " << ret << dendl;
405 lderr(cct) << __func__ << " port " << int(_port_idx)
406 << ": failed to set hardware flow control settings: " << ret << dendl;
410 ldout(cct, 1) << __func__ << " port " << int(_port_idx) << ": HW FC " << _enable_fc << dendl;
414 ldout(cct, 1) << __func__ << " port " << int(_port_idx) << ": changing HW FC settings is not supported" << dendl;
417 int DPDKDevice::init_port_fini()
419 // Changing FC requires HW reset, so set it before the port is initialized.
420 set_hw_flow_control();
422 if (rte_eth_dev_start(_port_idx) != 0) {
423 lderr(cct) << __func__ << " can't start port " << _port_idx << dendl;
427 if (_num_queues > 1) {
428 if (!rte_eth_dev_filter_supported(_port_idx, RTE_ETH_FILTER_HASH)) {
429 ldout(cct, 5) << __func__ << " Port " << _port_idx << ": HASH FILTER configuration is supported" << dendl;
431 // Setup HW touse the TOEPLITZ hash function as an RSS hash function
432 struct rte_eth_hash_filter_info info = {};
434 info.info_type = RTE_ETH_HASH_FILTER_GLOBAL_CONFIG;
435 info.info.global_conf.hash_func = RTE_ETH_HASH_FUNCTION_TOEPLITZ;
437 if (rte_eth_dev_filter_ctrl(_port_idx, RTE_ETH_FILTER_HASH,
438 RTE_ETH_FILTER_SET, &info) < 0) {
439 lderr(cct) << __func__ << " cannot set hash function on a port " << _port_idx << dendl;
448 if (check_port_link_status() < 0) {
449 lderr(cct) << __func__ << " port link up failed " << _port_idx << dendl;
453 ldout(cct, 5) << __func__ << " created DPDK device" << dendl;
457 void DPDKQueuePair::configure_proxies(const std::map<unsigned, float>& cpu_weights) {
458 assert(!cpu_weights.empty());
459 if (cpu_weights.size() == 1 && cpu_weights.begin()->first == _qid) {
460 // special case queue sending to self only, to avoid requiring a hash value
463 register_packet_provider([this] {
465 if (!_proxy_packetq.empty()) {
466 p = std::move(_proxy_packetq.front());
467 _proxy_packetq.pop_front();
471 build_sw_reta(cpu_weights);
474 void DPDKQueuePair::build_sw_reta(const std::map<unsigned, float>& cpu_weights) {
475 float total_weight = 0;
476 for (auto&& x : cpu_weights) {
477 total_weight += x.second;
481 std::array<uint8_t, 128> reta;
482 for (auto&& entry : cpu_weights) {
483 auto cpu = entry.first;
484 auto weight = entry.second;
486 while (idx < (accum / total_weight * reta.size() - 0.5)) {
494 bool DPDKQueuePair::init_rx_mbuf_pool()
496 std::string name = std::string(pktmbuf_pool_name) + std::to_string(_qid) + "_rx";
498 // reserve the memory for Rx buffers containers
499 _rx_free_pkts.reserve(mbufs_per_queue_rx);
500 _rx_free_bufs.reserve(mbufs_per_queue_rx);
502 _pktmbuf_pool_rx = rte_mempool_lookup(name.c_str());
503 if (!_pktmbuf_pool_rx) {
504 ldout(cct, 1) << __func__ << " Creating Rx mbuf pool '" << name.c_str()
505 << "' [" << mbufs_per_queue_rx << " mbufs] ..."<< dendl;
508 // Don't pass single-producer/single-consumer flags to mbuf create as it
509 // seems faster to use a cache instead.
511 struct rte_pktmbuf_pool_private roomsz = {};
512 roomsz.mbuf_data_room_size = mbuf_data_size + RTE_PKTMBUF_HEADROOM;
513 _pktmbuf_pool_rx = rte_mempool_create(
515 mbufs_per_queue_rx, mbuf_overhead,
517 sizeof(struct rte_pktmbuf_pool_private),
518 rte_pktmbuf_pool_init, as_cookie(roomsz),
519 rte_pktmbuf_init, nullptr,
521 if (!_pktmbuf_pool_rx) {
522 lderr(cct) << __func__ << " Failed to create mempool for rx" << dendl;
527 // 1) Pull all entries from the pool.
528 // 2) Bind data buffers to each of them.
529 // 3) Return them back to the pool.
531 for (int i = 0; i < mbufs_per_queue_rx; i++) {
532 rte_mbuf* m = rte_pktmbuf_alloc(_pktmbuf_pool_rx);
534 _rx_free_bufs.push_back(m);
537 for (int i = 0; i < cct->_conf->ms_dpdk_rx_buffer_count_per_core; i++) {
538 void* m = rte_malloc(NULL, mbuf_data_size, mbuf_data_size);
540 _alloc_bufs.push_back(m);
543 for (auto&& m : _rx_free_bufs) {
544 if (!init_noninline_rx_mbuf(m, mbuf_data_size, _alloc_bufs)) {
545 lderr(cct) << __func__ << " Failed to allocate data buffers for Rx ring. "
546 "Consider increasing the amount of memory." << dendl;
551 rte_mempool_put_bulk(_pktmbuf_pool_rx, (void**)_rx_free_bufs.data(),
552 _rx_free_bufs.size());
554 _rx_free_bufs.clear();
555 if (rte_eth_rx_queue_setup(_dev_port_idx, _qid, default_ring_size,
556 rte_eth_dev_socket_id(_dev_port_idx),
557 _dev->def_rx_conf(), _pktmbuf_pool_rx) < 0) {
558 lderr(cct) << __func__ << " cannot initialize rx queue" << dendl;
563 ldout(cct, 20) << __func__ << " count " << rte_mempool_count(_pktmbuf_pool_rx) << " free count " << rte_mempool_free_count(_pktmbuf_pool_rx) << dendl;
564 return _pktmbuf_pool_rx != nullptr;
567 int DPDKDevice::check_port_link_status()
571 ldout(cct, 20) << __func__ << dendl;
572 const int sleep_time = 100 * 1000;
573 const int max_check_time = 90; /* 9s (90 * 100ms) in total */
575 struct rte_eth_link link;
576 memset(&link, 0, sizeof(link));
577 rte_eth_link_get_nowait(_port_idx, &link);
580 if (link.link_status) {
581 ldout(cct, 5) << __func__ << " done port "
582 << static_cast<unsigned>(_port_idx)
583 << " link Up - speed " << link.link_speed
585 << ((link.link_duplex == ETH_LINK_FULL_DUPLEX) ? ("full-duplex") : ("half-duplex\n"))
588 } else if (count++ < max_check_time) {
589 ldout(cct, 20) << __func__ << " not ready, continue to wait." << dendl;
592 lderr(cct) << __func__ << "done port " << _port_idx << " link down" << dendl;
600 class C_handle_dev_stats : public EventCallback {
603 C_handle_dev_stats(DPDKQueuePair *qp): _qp(qp) { }
604 void do_request(int id) {
609 DPDKQueuePair::DPDKQueuePair(CephContext *c, EventCenter *cen, DPDKDevice* dev, uint8_t qid)
610 : cct(c), _dev(dev), _dev_port_idx(dev->port_idx()), center(cen), _qid(qid),
611 _tx_poller(this), _rx_gc_poller(this), _tx_buf_factory(c, dev, qid),
614 if (!init_rx_mbuf_pool()) {
615 lderr(cct) << __func__ << " cannot initialize mbuf pools" << dendl;
619 static_assert(offsetof(tx_buf, private_end) -
620 offsetof(tx_buf, private_start) <= RTE_PKTMBUF_HEADROOM,
621 "RTE_PKTMBUF_HEADROOM is less than DPDKQueuePair::tx_buf size! "
622 "Increase the headroom size in the DPDK configuration");
623 static_assert(offsetof(tx_buf, _mbuf) == 0,
624 "There is a pad at the beginning of the tx_buf before _mbuf "
626 static_assert((inline_mbuf_data_size & (inline_mbuf_data_size - 1)) == 0,
627 "inline_mbuf_data_size has to be a power of two!");
629 std::string name(std::string("queue") + std::to_string(qid));
630 PerfCountersBuilder plb(cct, name, l_dpdk_qp_first, l_dpdk_qp_last);
632 plb.add_u64_counter(l_dpdk_qp_rx_packets, "dpdk_receive_packets", "DPDK received packets");
633 plb.add_u64_counter(l_dpdk_qp_tx_packets, "dpdk_send_packets", "DPDK sendd packets");
634 plb.add_u64_counter(l_dpdk_qp_rx_bad_checksum_errors, "dpdk_receive_bad_checksum_errors", "DPDK received bad checksum packets");
635 plb.add_u64_counter(l_dpdk_qp_rx_no_memory_errors, "dpdk_receive_no_memory_errors", "DPDK received no memory packets");
636 plb.add_u64_counter(l_dpdk_qp_rx_bytes, "dpdk_receive_bytes", "DPDK received bytes");
637 plb.add_u64_counter(l_dpdk_qp_tx_bytes, "dpdk_send_bytes", "DPDK sendd bytes");
638 plb.add_u64_counter(l_dpdk_qp_rx_last_bunch, "dpdk_receive_last_bunch", "DPDK last received bunch");
639 plb.add_u64_counter(l_dpdk_qp_tx_last_bunch, "dpdk_send_last_bunch", "DPDK last send bunch");
640 plb.add_u64_counter(l_dpdk_qp_rx_fragments, "dpdk_receive_fragments", "DPDK received total fragments");
641 plb.add_u64_counter(l_dpdk_qp_tx_fragments, "dpdk_send_fragments", "DPDK sendd total fragments");
642 plb.add_u64_counter(l_dpdk_qp_rx_copy_ops, "dpdk_receive_copy_ops", "DPDK received copy operations");
643 plb.add_u64_counter(l_dpdk_qp_tx_copy_ops, "dpdk_send_copy_ops", "DPDK sendd copy operations");
644 plb.add_u64_counter(l_dpdk_qp_rx_copy_bytes, "dpdk_receive_copy_bytes", "DPDK received copy bytes");
645 plb.add_u64_counter(l_dpdk_qp_tx_copy_bytes, "dpdk_send_copy_bytes", "DPDK send copy bytes");
646 plb.add_u64_counter(l_dpdk_qp_rx_linearize_ops, "dpdk_receive_linearize_ops", "DPDK received linearize operations");
647 plb.add_u64_counter(l_dpdk_qp_tx_linearize_ops, "dpdk_send_linearize_ops", "DPDK send linearize operations");
648 plb.add_u64_counter(l_dpdk_qp_tx_queue_length, "dpdk_send_queue_length", "DPDK send queue length");
650 perf_logger = plb.create_perf_counters();
651 cct->get_perfcounters_collection()->add(perf_logger);
654 device_stat_time_fd = center->create_time_event(1000*1000, new C_handle_dev_stats(this));
657 void DPDKQueuePair::handle_stats()
659 ldout(cct, 20) << __func__ << " started." << dendl;
660 rte_eth_stats rte_stats = {};
661 int rc = rte_eth_stats_get(_dev_port_idx, &rte_stats);
664 ldout(cct, 0) << __func__ << " failed to get port statistics: " << cpp_strerror(rc) << dendl;
668 #if RTE_VERSION < RTE_VERSION_NUM(16,7,0,0)
669 _dev->perf_logger->set(l_dpdk_dev_rx_mcast, rte_stats.imcasts);
670 _dev->perf_logger->set(l_dpdk_dev_rx_badcrc_errors, rte_stats.ibadcrc);
672 _dev->perf_logger->set(l_dpdk_dev_rx_dropped_errors, rte_stats.imissed);
673 _dev->perf_logger->set(l_dpdk_dev_rx_nombuf_errors, rte_stats.rx_nombuf);
675 _dev->perf_logger->set(l_dpdk_dev_rx_total_errors, rte_stats.ierrors);
676 _dev->perf_logger->set(l_dpdk_dev_tx_total_errors, rte_stats.oerrors);
677 device_stat_time_fd = center->create_time_event(1000*1000, new C_handle_dev_stats(this));
680 bool DPDKQueuePair::poll_tx() {
681 bool nonloopback = !cct->_conf->ms_dpdk_debug_allow_loopback;
683 uint64_t start = Cycles::rdtsc();
685 uint32_t total_work = 0;
686 if (_tx_packetq.size() < 16) {
687 // refill send queue from upper layers
691 for (auto&& pr : _pkt_providers) {
695 if (likely(nonloopback)) {
696 // ldout(cct, 0) << __func__ << " len: " << p->len() << " frags: " << p->nr_frags() << dendl;
697 _tx_packetq.push_back(std::move(*p));
699 auto th = p->get_header<eth_hdr>(0);
700 if (th->dst_mac == th->src_mac) {
701 _dev->l2receive(_qid, std::move(*p));
703 _tx_packetq.push_back(std::move(*p));
706 if (_tx_packetq.size() == 128) {
712 } while (work && total_work < 256 && _tx_packetq.size() < 128);
714 if (!_tx_packetq.empty()) {
715 uint64_t c = send(_tx_packetq);
716 perf_logger->inc(l_dpdk_qp_tx_packets, c);
717 perf_logger->set(l_dpdk_qp_tx_last_bunch, c);
719 tx_count += total_work;
720 tx_cycles += Cycles::rdtsc() - start;
728 inline Tub<Packet> DPDKQueuePair::from_mbuf_lro(rte_mbuf* m)
733 for (; m != nullptr; m = m->next) {
734 char* data = rte_pktmbuf_mtod(m, char*);
736 _frags.emplace_back(fragment{data, rte_pktmbuf_data_len(m)});
737 _bufs.push_back(data);
740 auto del = std::bind(
741 [this](std::vector<char*> &bufs) {
742 for (auto&& b : bufs) { _alloc_bufs.push_back(b); }
743 }, std::move(_bufs));
745 _frags.begin(), _frags.end(), make_deleter(std::move(del)));
748 inline Tub<Packet> DPDKQueuePair::from_mbuf(rte_mbuf* m)
750 _rx_free_pkts.push_back(m);
751 _num_rx_free_segs += m->nb_segs;
753 if (!_dev->hw_features_ref().rx_lro || rte_pktmbuf_is_contiguous(m)) {
754 char* data = rte_pktmbuf_mtod(m, char*);
756 return Packet(fragment{data, rte_pktmbuf_data_len(m)},
757 make_deleter([this, data] { _alloc_bufs.push_back(data); }));
759 return from_mbuf_lro(m);
763 inline bool DPDKQueuePair::refill_one_cluster(rte_mbuf* head)
765 for (; head != nullptr; head = head->next) {
766 if (!refill_rx_mbuf(head, mbuf_data_size, _alloc_bufs)) {
768 // If we failed to allocate a new buffer - push the rest of the
769 // cluster back to the free_packets list for a later retry.
771 _rx_free_pkts.push_back(head);
774 _rx_free_bufs.push_back(head);
780 bool DPDKQueuePair::rx_gc(bool force)
782 if (_num_rx_free_segs >= rx_gc_thresh || force) {
783 ldout(cct, 10) << __func__ << " free segs " << _num_rx_free_segs
784 << " thresh " << rx_gc_thresh
785 << " free pkts " << _rx_free_pkts.size()
786 << " pool count " << rte_mempool_count(_pktmbuf_pool_rx)
787 << " free pool count " << rte_mempool_free_count(_pktmbuf_pool_rx)
790 while (!_rx_free_pkts.empty()) {
792 // Use back() + pop_back() semantics to avoid an extra
793 // _rx_free_pkts.clear() at the end of the function - clear() has a
794 // linear complexity.
796 auto m = _rx_free_pkts.back();
797 _rx_free_pkts.pop_back();
799 if (!refill_one_cluster(m)) {
800 ldout(cct, 1) << __func__ << " get new mbuf failed " << dendl;
805 if (_rx_free_bufs.size()) {
806 rte_mempool_put_bulk(_pktmbuf_pool_rx,
807 (void **)_rx_free_bufs.data(),
808 _rx_free_bufs.size());
810 // TODO: assert() in a fast path! Remove me ASAP!
811 assert(_num_rx_free_segs >= _rx_free_bufs.size());
813 _num_rx_free_segs -= _rx_free_bufs.size();
814 _rx_free_bufs.clear();
816 // TODO: assert() in a fast path! Remove me ASAP!
817 assert((_rx_free_pkts.empty() && !_num_rx_free_segs) ||
818 (!_rx_free_pkts.empty() && _num_rx_free_segs));
822 return _num_rx_free_segs >= rx_gc_thresh;
826 void DPDKQueuePair::process_packets(
827 struct rte_mbuf **bufs, uint16_t count)
829 uint64_t nr_frags = 0, bytes = 0;
831 for (uint16_t i = 0; i < count; i++) {
832 struct rte_mbuf *m = bufs[i];
835 Tub<Packet> p = from_mbuf(m);
837 // Drop the packet if translation above has failed
839 perf_logger->inc(l_dpdk_qp_rx_no_memory_errors);
842 // ldout(cct, 0) << __func__ << " len " << p->len() << " " << dendl;
844 nr_frags += m->nb_segs;
847 // Set stipped VLAN value if available
848 if ((_dev->_dev_info.rx_offload_capa & DEV_RX_OFFLOAD_VLAN_STRIP) &&
849 (m->ol_flags & PKT_RX_VLAN_PKT)) {
850 oi.vlan_tci = m->vlan_tci;
853 if (_dev->get_hw_features().rx_csum_offload) {
854 if (m->ol_flags & (PKT_RX_IP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD)) {
855 // Packet with bad checksum, just drop it.
856 perf_logger->inc(l_dpdk_qp_rx_bad_checksum_errors);
859 // Note that when _hw_features.rx_csum_offload is on, the receive
860 // code for ip, tcp and udp will assume they don't need to check
861 // the checksum again, because we did this here.
864 p->set_offload_info(oi);
865 if (m->ol_flags & PKT_RX_RSS_HASH) {
866 p->set_rss_hash(m->hash.rss);
869 _dev->l2receive(_qid, std::move(*p));
872 perf_logger->inc(l_dpdk_qp_rx_packets, count);
873 perf_logger->set(l_dpdk_qp_rx_last_bunch, count);
874 perf_logger->inc(l_dpdk_qp_rx_fragments, nr_frags);
875 perf_logger->inc(l_dpdk_qp_rx_bytes, bytes);
878 bool DPDKQueuePair::poll_rx_once()
880 struct rte_mbuf *buf[packet_read_size];
884 uint64_t start = Cycles::rdtsc();
886 uint16_t count = rte_eth_rx_burst(_dev_port_idx, _qid,
887 buf, packet_read_size);
889 /* Now process the NIC packets read */
890 if (likely(count > 0)) {
891 process_packets(buf, count);
893 rx_cycles = Cycles::rdtsc() - start;
899 if (rx_count > 10000 && tx_count) {
900 ldout(cct, 0) << __func__ << " rx count=" << rx_count << " avg rx=" << Cycles::to_nanoseconds(rx_cycles)/rx_count << "ns "
901 << " tx count=" << tx_count << " avg tx=" << Cycles::to_nanoseconds(tx_cycles)/tx_count << "ns"
903 rx_count = rx_cycles = tx_count = tx_cycles = 0;
911 DPDKQueuePair::tx_buf_factory::tx_buf_factory(CephContext *c,
912 DPDKDevice *dev, uint8_t qid): cct(c)
914 std::string name = std::string(pktmbuf_pool_name) + std::to_string(qid) + "_tx";
916 _pool = rte_mempool_lookup(name.c_str());
918 ldout(cct, 0) << __func__ << " Creating Tx mbuf pool '" << name.c_str()
919 << "' [" << mbufs_per_queue_tx << " mbufs] ..." << dendl;
921 // We are going to push the buffers from the mempool into
922 // the circular_buffer and then poll them from there anyway, so
923 // we prefer to make a mempool non-atomic in this case.
925 _pool = rte_mempool_create(name.c_str(),
926 mbufs_per_queue_tx, inline_mbuf_size,
928 sizeof(struct rte_pktmbuf_pool_private),
929 rte_pktmbuf_pool_init, nullptr,
930 rte_pktmbuf_init, nullptr,
934 lderr(cct) << __func__ << " Failed to create mempool for Tx" << dendl;
937 if (rte_eth_tx_queue_setup(dev->port_idx(), qid, default_ring_size,
938 rte_eth_dev_socket_id(dev->port_idx()),
939 dev->def_tx_conf()) < 0) {
940 lderr(cct) << __func__ << " cannot initialize tx queue" << dendl;
946 // Fill the factory with the buffers from the mempool allocated
952 bool DPDKQueuePair::tx_buf::i40e_should_linearize(rte_mbuf *head)
954 bool is_tso = head->ol_flags & PKT_TX_TCP_SEG;
956 // For a non-TSO case: number of fragments should not exceed 8
958 return head->nb_segs > i40e_max_xmit_segment_frags;
962 // For a TSO case each MSS window should not include more than 8
963 // fragments including headers.
966 // Calculate the number of frags containing headers.
968 // Note: we support neither VLAN nor tunneling thus headers size
969 // accounting is super simple.
971 size_t headers_size = head->l2_len + head->l3_len + head->l4_len;
972 unsigned hdr_frags = 0;
973 size_t cur_payload_len = 0;
974 rte_mbuf *cur_seg = head;
976 while (cur_seg && cur_payload_len < headers_size) {
977 cur_payload_len += cur_seg->data_len;
978 cur_seg = cur_seg->next;
983 // Header fragments will be used for each TSO segment, thus the
984 // maximum number of data segments will be 8 minus the number of
987 // It's unclear from the spec how the first TSO segment is treated
988 // if the last fragment with headers contains some data bytes:
989 // whether this fragment will be accounted as a single fragment or
990 // as two separate fragments. We prefer to play it safe and assume
991 // that this fragment will be accounted as two separate fragments.
993 size_t max_win_size = i40e_max_xmit_segment_frags - hdr_frags;
995 if (head->nb_segs <= max_win_size) {
999 // Get the data (without headers) part of the first data fragment
1000 size_t prev_frag_data = cur_payload_len - headers_size;
1001 auto mss = head->tso_segsz;
1004 unsigned frags_in_seg = 0;
1005 size_t cur_seg_size = 0;
1007 if (prev_frag_data) {
1008 cur_seg_size = prev_frag_data;
1013 while (cur_seg_size < mss && cur_seg) {
1014 cur_seg_size += cur_seg->data_len;
1015 cur_seg = cur_seg->next;
1018 if (frags_in_seg > max_win_size) {
1023 if (cur_seg_size > mss) {
1024 prev_frag_data = cur_seg_size - mss;
1031 void DPDKQueuePair::tx_buf::set_cluster_offload_info(const Packet& p, const DPDKQueuePair& qp, rte_mbuf* head)
1033 // Handle TCP checksum offload
1034 auto oi = p.offload_info();
1035 if (oi.needs_ip_csum) {
1036 head->ol_flags |= PKT_TX_IP_CKSUM;
1037 // TODO: Take a VLAN header into an account here
1038 head->l2_len = sizeof(struct ether_hdr);
1039 head->l3_len = oi.ip_hdr_len;
1041 if (qp.port().get_hw_features().tx_csum_l4_offload) {
1042 if (oi.protocol == ip_protocol_num::tcp) {
1043 head->ol_flags |= PKT_TX_TCP_CKSUM;
1044 // TODO: Take a VLAN header into an account here
1045 head->l2_len = sizeof(struct ether_hdr);
1046 head->l3_len = oi.ip_hdr_len;
1048 if (oi.tso_seg_size) {
1049 assert(oi.needs_ip_csum);
1050 head->ol_flags |= PKT_TX_TCP_SEG;
1051 head->l4_len = oi.tcp_hdr_len;
1052 head->tso_segsz = oi.tso_seg_size;
1058 DPDKQueuePair::tx_buf* DPDKQueuePair::tx_buf::from_packet_zc(
1059 CephContext *cct, Packet&& p, DPDKQueuePair& qp)
1061 // Too fragmented - linearize
1062 if (p.nr_frags() > max_frags) {
1064 qp.perf_logger->inc(l_dpdk_qp_tx_linearize_ops);
1068 rte_mbuf *head = nullptr, *last_seg = nullptr;
1072 // Create a HEAD of the fragmented packet: check if frag0 has to be
1073 // copied and if yes - send it in a copy way
1075 if (!check_frag0(p)) {
1076 if (!copy_one_frag(qp, p.frag(0), head, last_seg, nsegs)) {
1077 ldout(cct, 1) << __func__ << " no available mbuf for " << p.frag(0).size << dendl;
1080 } else if (!translate_one_frag(qp, p.frag(0), head, last_seg, nsegs)) {
1081 ldout(cct, 1) << __func__ << " no available mbuf for " << p.frag(0).size << dendl;
1085 unsigned total_nsegs = nsegs;
1087 for (unsigned i = 1; i < p.nr_frags(); i++) {
1088 rte_mbuf *h = nullptr, *new_last_seg = nullptr;
1089 if (!translate_one_frag(qp, p.frag(i), h, new_last_seg, nsegs)) {
1090 ldout(cct, 1) << __func__ << " no available mbuf for " << p.frag(i).size << dendl;
1091 me(head)->recycle();
1095 total_nsegs += nsegs;
1097 // Attach a new buffers' chain to the packet chain
1099 last_seg = new_last_seg;
1102 // Update the HEAD buffer with the packet info
1103 head->pkt_len = p.len();
1104 head->nb_segs = total_nsegs;
1106 set_cluster_offload_info(p, qp, head);
1109 // If a packet hasn't been linearized already and the resulting
1110 // cluster requires the linearisation due to HW limitation:
1112 // - Recycle the cluster.
1113 // - Linearize the packet.
1114 // - Build the cluster once again
1116 if (head->nb_segs > max_frags ||
1117 (p.nr_frags() > 1 && qp.port().is_i40e_device() && i40e_should_linearize(head)) ||
1118 (p.nr_frags() > vmxnet3_max_xmit_segment_frags && qp.port().is_vmxnet3_device())) {
1119 me(head)->recycle();
1121 qp.perf_logger->inc(l_dpdk_qp_tx_linearize_ops);
1123 goto build_mbuf_cluster;
1126 me(last_seg)->set_packet(std::move(p));
1131 void DPDKQueuePair::tx_buf::copy_packet_to_cluster(const Packet& p, rte_mbuf* head)
1133 rte_mbuf* cur_seg = head;
1134 size_t cur_seg_offset = 0;
1135 unsigned cur_frag_idx = 0;
1136 size_t cur_frag_offset = 0;
1139 size_t to_copy = std::min(p.frag(cur_frag_idx).size - cur_frag_offset,
1140 inline_mbuf_data_size - cur_seg_offset);
1142 memcpy(rte_pktmbuf_mtod_offset(cur_seg, void*, cur_seg_offset),
1143 p.frag(cur_frag_idx).base + cur_frag_offset, to_copy);
1145 cur_frag_offset += to_copy;
1146 cur_seg_offset += to_copy;
1148 if (cur_frag_offset >= p.frag(cur_frag_idx).size) {
1150 if (cur_frag_idx >= p.nr_frags()) {
1152 // We are done - set the data size of the last segment
1155 cur_seg->data_len = cur_seg_offset;
1159 cur_frag_offset = 0;
1162 if (cur_seg_offset >= inline_mbuf_data_size) {
1163 cur_seg->data_len = inline_mbuf_data_size;
1164 cur_seg = cur_seg->next;
1167 // FIXME: assert in a fast-path - remove!!!
1173 DPDKQueuePair::tx_buf* DPDKQueuePair::tx_buf::from_packet_copy(Packet&& p, DPDKQueuePair& qp)
1181 * Here we are going to use the fact that the inline data size is a
1184 * We will first try to allocate the cluster and only if we are
1185 * successful - we will go and copy the data.
1187 auto aligned_len = align_up((size_t)p.len(), inline_mbuf_data_size);
1188 unsigned nsegs = aligned_len / inline_mbuf_data_size;
1189 rte_mbuf *head = nullptr, *last_seg = nullptr;
1191 tx_buf* buf = qp.get_tx_buf();
1196 head = buf->rte_mbuf_p();
1198 for (unsigned i = 1; i < nsegs; i++) {
1199 buf = qp.get_tx_buf();
1201 me(head)->recycle();
1205 last_seg->next = buf->rte_mbuf_p();
1206 last_seg = last_seg->next;
1210 // If we've got here means that we have succeeded already!
1211 // We only need to copy the data and set the head buffer with the
1214 head->pkt_len = p.len();
1215 head->nb_segs = nsegs;
1217 copy_packet_to_cluster(p, head);
1218 set_cluster_offload_info(p, qp, head);
1223 size_t DPDKQueuePair::tx_buf::copy_one_data_buf(
1224 DPDKQueuePair& qp, rte_mbuf*& m, char* data, size_t buf_len)
1226 tx_buf* buf = qp.get_tx_buf();
1231 size_t len = std::min(buf_len, inline_mbuf_data_size);
1233 m = buf->rte_mbuf_p();
1239 qp.perf_logger->inc(l_dpdk_qp_tx_copy_ops);
1240 qp.perf_logger->inc(l_dpdk_qp_tx_copy_bytes, len);
1242 memcpy(rte_pktmbuf_mtod(m, void*), data, len);
1247 void DPDKDevice::set_rss_table()
1249 // always fill our local indirection table.
1251 for (auto& r : _redir_table) {
1252 r = i++ % _num_queues;
1255 if (_dev_info.reta_size == 0)
1258 int reta_conf_size = std::max(1, _dev_info.reta_size / RTE_RETA_GROUP_SIZE);
1259 rte_eth_rss_reta_entry64 reta_conf[reta_conf_size];
1261 // Configure the HW indirection table
1263 for (auto& x : reta_conf) {
1265 for (auto& r: x.reta) {
1266 r = i++ % _num_queues;
1270 if (rte_eth_dev_rss_reta_update(_port_idx, reta_conf, _dev_info.reta_size)) {
1271 rte_exit(EXIT_FAILURE, "Port %d: Failed to update an RSS indirection table", _port_idx);
1275 /******************************** Interface functions *************************/
1277 std::unique_ptr<DPDKDevice> create_dpdk_net_device(
1284 // Check that we have at least one DPDK-able port
1285 if (rte_eth_dev_count() == 0) {
1286 rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
1288 ldout(cct, 10) << __func__ << " ports number: " << int(rte_eth_dev_count()) << dendl;
1291 return std::unique_ptr<DPDKDevice>(
1292 new DPDKDevice(cct, port_idx, cores, use_lro, enable_fc));