From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 4C442A0C45; Mon, 5 Jul 2021 19:06:00 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id C0EA74068C; Mon, 5 Jul 2021 19:05:59 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by mails.dpdk.org (Postfix) with ESMTP id 10BB040141 for ; Mon, 5 Jul 2021 19:05:57 +0200 (CEST) X-IronPort-AV: E=McAfee;i="6200,9189,10036"; a="189385003" X-IronPort-AV: E=Sophos;i="5.83,325,1616482800"; d="scan'208";a="189385003" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jul 2021 10:05:56 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,325,1616482800"; d="scan'208";a="456780654" Received: from silpixa00400466.ir.intel.com ([10.237.213.142]) by orsmga008.jf.intel.com with ESMTP; 05 Jul 2021 10:05:54 -0700 From: Conor Walsh To: konstantin.ananyev@intel.com, vladimir.medvedkin@intel.com, ruifeng.wang@arm.com, jerinj@marvell.com Cc: dev@dpdk.org, paulis.gributs@intel.com, Conor Walsh Date: Mon, 5 Jul 2021 17:05:46 +0000 Message-Id: <20210705170546.1002806-1-conor.walsh@intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-dev] [PATCH] examples/l3fwd: remove useless reloads in FIB main loop 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 Sender: "dev" This patch aligns the l3fwd FIB code with the changes made to LPM in commit 74fb854a3de6 ("examples/l3fwd: remove useless reloads in LPM main loop"). This change ensures the compiler knows that the lcore config variables are constant values and the compiler will then optimize the code accordingly. Signed-off-by: Conor Walsh --- examples/l3fwd/l3fwd_fib.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/examples/l3fwd/l3fwd_fib.c b/examples/l3fwd/l3fwd_fib.c index 1787229942..d083ddfdd5 100644 --- a/examples/l3fwd/l3fwd_fib.c +++ b/examples/l3fwd/l3fwd_fib.c @@ -182,14 +182,16 @@ fib_main_loop(__rte_unused void *dummy) lcore_id = rte_lcore_id(); qconf = &lcore_conf[lcore_id]; - if (qconf->n_rx_queue == 0) { + const uint16_t n_rx_q = qconf->n_rx_queue; + const uint16_t n_tx_p = qconf->n_tx_port; + if (n_rx_q == 0) { RTE_LOG(INFO, L3FWD, "lcore %u has nothing to do\n", lcore_id); return 0; } RTE_LOG(INFO, L3FWD, "entering main loop on lcore %u\n", lcore_id); - for (i = 0; i < qconf->n_rx_queue; i++) { + for (i = 0; i < n_rx_q; i++) { portid = qconf->rx_queue_list[i].port_id; queueid = qconf->rx_queue_list[i].queue_id; @@ -207,7 +209,7 @@ fib_main_loop(__rte_unused void *dummy) diff_tsc = cur_tsc - prev_tsc; if (unlikely(diff_tsc > drain_tsc)) { - for (i = 0; i < qconf->n_tx_port; ++i) { + for (i = 0; i < n_tx_p; ++i) { portid = qconf->tx_port_id[i]; if (qconf->tx_mbufs[portid].len == 0) continue; @@ -221,7 +223,7 @@ fib_main_loop(__rte_unused void *dummy) } /* Read packet from RX queues. */ - for (i = 0; i < qconf->n_rx_queue; ++i) { + for (i = 0; i < n_rx_q; ++i) { portid = qconf->rx_queue_list[i].port_id; queueid = qconf->rx_queue_list[i].queue_id; nb_rx = rte_eth_rx_burst(portid, queueid, pkts_burst, -- 2.25.1