From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id A8C1CA0679 for ; Tue, 2 Apr 2019 20:22:31 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 9DA265B1C; Tue, 2 Apr 2019 20:22:30 +0200 (CEST) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by dpdk.org (Postfix) with ESMTP id 353185681 for ; Tue, 2 Apr 2019 20:22:29 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Apr 2019 11:22:28 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,301,1549958400"; d="scan'208";a="219914254" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.46]) ([10.237.221.46]) by orsmga001.jf.intel.com with ESMTP; 02 Apr 2019 11:22:25 -0700 To: Tom Barbette , dev@dpdk.org Cc: bruce.richardson@intel.com, john.mcnamara@intel.com, Thomas Monjalon , Andrew Rybchenko , Shahaf Shuler , Yongseok Koh References: <20190327061935.19572-1-barbette@kth.se> <20190327061935.19572-4-barbette@kth.se> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190327061935.19572-4-barbette@kth.se> Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v2 3/3] rxtx_callbacks: Add support for HW timestamp X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Message-ID: <20190402182225.-M7KlRTqo0Z3GEI1mQOrC2_MwZUurau8YQfw8NVkCcU@z> On 3/27/2019 6:19 AM, Tom Barbette wrote: > Use rxtx callback to demonstrate a way to use rte_eth_read_clock to > convert the hardware timestamps to an amount of cycles. > > This allows to get the amount of time the packet spent since its entry > in the device. While the regular latency only shows the latency from > when it entered the software stack. > > Signed-off-by: Tom Barbette <...> > @@ -50,6 +50,8 @@ include $(RTE_SDK)/mk/rte.vars.mk > > CFLAGS += $(WERROR_FLAGS) > > + > +CFLAGS += -DALLOW_EXPERIMENTAL_API Can you please add the experimental API as a comment. > # workaround for a gcc bug with noreturn attribute > # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12603 > ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y) > diff --git a/examples/rxtx_callbacks/main.c b/examples/rxtx_callbacks/main.c > index 2058be627..7000464e1 100644 > --- a/examples/rxtx_callbacks/main.c > +++ b/examples/rxtx_callbacks/main.c > @@ -10,6 +10,8 @@ > #include > #include > > +#include libc includes are already together above, can you move this above > + > #define RX_RING_SIZE 1024 > #define TX_RING_SIZE 1024 > > @@ -17,6 +19,9 @@ > #define MBUF_CACHE_SIZE 250 > #define BURST_SIZE 32 > > +static const char usage[] = > + "%s EAL_ARGS -- [-t]\n"; > + > static const struct rte_eth_conf port_conf_default = { > .rxmode = { > .max_rx_pkt_len = ETHER_MAX_LEN, > @@ -25,9 +30,14 @@ static const struct rte_eth_conf port_conf_default = { > > static struct { > uint64_t total_cycles; > + uint64_t total_queue_cycles; > uint64_t total_pkts; > } latency_numbers; > > +int hw_timestamping; > + > +#define TICKS_PER_CYCLE_SHIFT 16 > +uint64_t ticks_per_cycle_mult; I am aware this is single .c file application, but as a good practice can you please make above global variables static. <...> > @@ -95,9 +126,20 @@ port_init(uint16_t port, struct rte_mempool *mbuf_pool) > if (retval != 0) > return retval; > > + rxconf = dev_info.default_rxconf; > + > + if (hw_timestamping) { > + if (!(dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TIMESTAMP)) { > + printf("\nERROR: Port %u does not support hardware timestamping\n" > + , port); > + return -1; > + } > + rxconf.offloads |= DEV_RX_OFFLOAD_TIMESTAMP; > + } Same comment as ethdev one, above code assume if driver announces 'DEV_RX_OFFLOAD_TIMESTAMP' capability, it have to implement 'read_clock' dev_ops, should it be the case? Write now only mlx implements it so this is not a problem at all, but I don't know if all PMDs supports timestamping packets must implement 'read_clock'. <...> > @@ -6,6 +6,7 @@ > # To build this example as a standalone application with an already-installed > # DPDK instance, use 'make' > > +allow_experimental_apis = true Can you please add the experimental API as a comment. > sources = files( > 'main.c' > ) >