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DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jun 2023 11:10:33.6350 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e0bb871c-4d8c-4369-00e2-08db77c84afe X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.161]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT108.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6861 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org The Python script is intended to analyze mlx5 PMD datapath traces and report: - tx_burst routine timings - how packets are pushed to WQEs - how packet sending is completed with timings Signed-off-by: Viacheslav Ovsiienko --- drivers/net/mlx5/tools/mlx5_trace.py | 271 +++++++++++++++++++++++++++ 1 file changed, 271 insertions(+) create mode 100755 drivers/net/mlx5/tools/mlx5_trace.py diff --git a/drivers/net/mlx5/tools/mlx5_trace.py b/drivers/net/mlx5/tools/mlx5_trace.py new file mode 100755 index 0000000000..c8fa63a7b9 --- /dev/null +++ b/drivers/net/mlx5/tools/mlx5_trace.py @@ -0,0 +1,271 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: BSD-3-Clause +# Copyright (c) 2023 NVIDIA Corporation & Affiliates + +''' +Analyzing the mlx5 PMD datapath tracings +''' +import sys +import argparse +import pathlib +import bt2 + +PFX_TX = "pmd.net.mlx5.tx." +PFX_TX_LEN = len(PFX_TX) + +tx_blst = {} # current Tx bursts per CPU +tx_qlst = {} # active Tx queues per port/queue +tx_wlst = {} # wait timestamp list per CPU + +class mlx5_queue(object): + def __init__(self): + self.done_burst = [] # completed bursts + self.wait_burst = [] # waiting for completion + self.pq_id = 0 + + def log(self): + for txb in self.done_burst: + txb.log() + + +class mlx5_mbuf(object): + def __init__(self): + self.wqe = 0 # wqe id + self.ptr = None # first packet mbuf pointer + self.len = 0 # packet data length + self.nseg = 0 # number of segments + + def log(self): + out = " %X: %u" % (self.ptr, self.len) + if self.nseg != 1: + out += " (%d segs)" % self.nseg + print(out) + + +class mlx5_wqe(object): + def __init__(self): + self.mbuf = [] # list of mbufs in WQE + self.wait_ts = 0 # preceding wait/push timestamp + self.comp_ts = 0 # send/recv completion timestamp + self.opcode = 0 + + def log(self): + id = (self.opcode >> 8) & 0xFFFF + op = self.opcode & 0xFF + fl = self.opcode >> 24 + out = " %04X: " % id + if op == 0xF: + out += "WAIT" + elif op == 0x29: + out += "EMPW" + elif op == 0xE: + out += "TSO " + elif op == 0xA: + out += "SEND" + else: + out += "0x%02X" % op + if self.comp_ts != 0: + out += " (%d, %d)" % (self.wait_ts, self.comp_ts - self.wait_ts) + else: + out += " (%d)" % self.wait_ts + print(out) + for mbuf in self.mbuf: + mbuf.log() + + # return 0 if WQE in not completed + def comp(self, wqe_id, ts): + if self.comp_ts != 0: + return 1 + id = (self.opcode >> 8) & 0xFFFF + if id > wqe_id: + id -= wqe_id + if id <= 0x8000: + return 0 + else: + id = wqe_id - id + if id >= 0x8000: + return 0 + self.comp_ts = ts + return 1 + + +class mlx5_burst(object): + def __init__(self): + self.wqes = [] # issued burst WQEs + self.done = 0 # number of sent/recv packets + self.req = 0 # requested number of packets + self.call_ts = 0 # burst routine invocation + self.done_ts = 0 # burst routine done + self.queue = None + + def log(self): + port = self.queue.pq_id >> 16 + queue = self.queue.pq_id & 0xFFFF + if self.req == 0: + print("%u: tx(p=%u, q=%u, %u/%u pkts (incomplete)" % + (self.call_ts, port, queue, self.done, self.req)) + else: + print("%u: tx(p=%u, q=%u, %u/%u pkts in %u" % + (self.call_ts, port, queue, self.done, self.req, + self.done_ts - self.call_ts)) + for wqe in self.wqes: + wqe.log() + + # return 0 if not all of WQEs in burst completed + def comp(self, wqe_id, ts): + wlen = len(self.wqes) + if wlen == 0: + return 0 + for wqe in self.wqes: + if wqe.comp(wqe_id, ts) == 0: + return 0 + return 1 + + +def do_tx_entry(msg): + event = msg.event + cpu_id = event["cpu_id"] + burst = tx_blst.get(cpu_id) + if burst is not None: + # continue existing burst after WAIT + return + # allocate the new burst and append to the queue + burst = mlx5_burst() + burst.call_ts = msg.default_clock_snapshot.ns_from_origin + tx_blst[cpu_id] = burst + pq_id = event["port_id"] << 16 | event["queue_id"] + queue = tx_qlst.get(pq_id) + if queue is None: + # queue does not exist - allocate the new one + queue = mlx5_queue(); + queue.pq_id = pq_id + tx_qlst[pq_id] = queue + burst.queue = queue + queue.wait_burst.append(burst) + + +def do_tx_exit(msg): + event = msg.event + cpu_id = event["cpu_id"] + burst = tx_blst.get(cpu_id) + if burst is None: + return + burst.done_ts = msg.default_clock_snapshot.ns_from_origin + burst.req = event["nb_req"] + burst.done = event["nb_sent"] + tx_blst.pop(cpu_id) + + +def do_tx_wqe(msg): + event = msg.event + cpu_id = event["cpu_id"] + burst = tx_blst.get(cpu_id) + if burst is None: + return + wqe = mlx5_wqe() + wqe.wait_ts = tx_wlst.get(cpu_id) + if wqe.wait_ts is None: + wqe.wait_ts = msg.default_clock_snapshot.ns_from_origin + wqe.opcode = event["opcode"] + burst.wqes.append(wqe) + + +def do_tx_wait(msg): + event = msg.event + cpu_id = event["cpu_id"] + tx_wlst[cpu_id] = event["ts"] + + +def do_tx_push(msg): + event = msg.event + cpu_id = event["cpu_id"] + burst = tx_blst.get(cpu_id) + if burst is None: + return + if not burst.wqes: + return + wqe = burst.wqes[-1] + mbuf = mlx5_mbuf() + mbuf.wqe = event["wqe_id"] + mbuf.ptr = event["mbuf"] + mbuf.len = event["mbuf_pkt_len"] + mbuf.nseg = event["mbuf_nb_segs"] + wqe.mbuf.append(mbuf) + + +def do_tx_complete(msg): + event = msg.event + pq_id = event["port_id"] << 16 | event["queue_id"] + queue = tx_qlst.get(pq_id) + if queue is None: + return + qlen = len(queue.wait_burst) + if qlen == 0: + return + wqe_id = event["wqe_id"] + ts = event["ts"] + rmv = 0 + while rmv < qlen: + burst = queue.wait_burst[rmv] + if burst.comp(wqe_id, ts) == 0: + break + rmv += 1 + # mode completed burst to done list + if rmv != 0: + idx = 0 + while idx < rmv: + queue.done_burst.append(burst) + idx += 1 + del queue.wait_burst[0:rmv] + + +def do_tx(msg): + name = msg.event.name[PFX_TX_LEN:] + if name == "entry": + do_tx_entry(msg) + elif name == "exit": + do_tx_exit(msg) + elif name == "wqe": + do_tx_wqe(msg) + elif name == "wait": + do_tx_wait(msg) + elif name == "push": + do_tx_push(msg) + elif name == "complete": + do_tx_complete(msg) + else: + print("Error: unrecognized Tx event name: %s" % msg.event.name) + sys.exit(1) + + +def do_log(msg_it): + for msg in msg_it: + if type(msg) is not bt2._EventMessageConst: + continue + event = msg.event + if event.name.startswith(PFX_TX): + do_tx(msg) + # Handling of other log event cathegories can be added here + + +def do_print(): + for pq_id in tx_qlst: + queue = tx_qlst.get(pq_id) + queue.log() + + +def main(args): + parser = argparse.ArgumentParser() + parser.add_argument("path", + nargs = 1, + type = str, + help = "input trace folder") + args = parser.parse_args() + + msg_it = bt2.TraceCollectionMessageIterator(args.path) + do_log(msg_it) + do_print() + exit(0) + +if __name__ == "__main__": + main(sys.argv) -- 2.18.1