From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 84240C10F14 for ; Thu, 10 Oct 2019 14:40:40 +0000 (UTC) Received: from dpdk.org (dpdk.org [92.243.14.124]) by mail.kernel.org (Postfix) with ESMTP id 293E5208C3 for ; Thu, 10 Oct 2019 14:40:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 293E5208C3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=dev-bounces@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 1FD201EA62; Thu, 10 Oct 2019 16:40:12 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 4E1981E9DA; Thu, 10 Oct 2019 16:40:10 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Oct 2019 07:40:09 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,280,1566889200"; d="scan'208";a="198372974" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by orsmga006.jf.intel.com with ESMTP; 10 Oct 2019 07:40:07 -0700 To: "Wiles, Keith" , "Smoczynski, MarcinX" Cc: "Ananyev, Konstantin" , "adrien.mazarguil@6wind.com" , "dev@dpdk.org" , "Drost, MariuszX" , "stable@dpdk.org" References: <20190902114310.15928-1-marcinx.smoczynski@intel.com> <20190923132247.16860-1-marcinx.smoczynski@intel.com> <20190923132247.16860-2-marcinx.smoczynski@intel.com> <0F6D6BB2-958A-4EEA-BACF-DB5BFE79A6D0@intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH v2 1/1] net/tap: fix blocked rx packets error 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" On 9/23/2019 3:41 PM, Wiles, Keith wrote: > > >> On Sep 23, 2019, at 8:22 AM, Smoczynski, MarcinX wrote: >> >> When OS sends more packets than are being read with a single >> 'rte_eth_rx_burst' call, rx packets are getting stucked in the tap pmd >> and are unable to receive, because trigger_seen is getting updated >> and consecutive calls are not getting any packets. >> >> Do not update trigger_seen unless less than a max number of packets were >> received allowing next call to receive the rest. >> >> Remove unnecessary compiler barrier. >> >> Fixes: a0d8e807d9 ("net/tap: add Rx trigger") >> Cc: stable@dpdk.org >> >> Tested-by: Mariusz Drost >> Tested-by: Konstantin Ananyev >> Signed-off-by: Marcin Smoczynski >> --- >> drivers/net/tap/rte_eth_tap.c | 7 ++++--- >> 1 file changed, 4 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c >> index 64bd04911..9c3adb832 100644 >> --- a/drivers/net/tap/rte_eth_tap.c >> +++ b/drivers/net/tap/rte_eth_tap.c >> @@ -353,10 +353,8 @@ pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) >> >> if (trigger == rxq->trigger_seen) >> return 0; >> - if (trigger) >> - rxq->trigger_seen = trigger; >> + >> process_private = rte_eth_devices[rxq->in_port].process_private; >> - rte_compiler_barrier(); >> for (num_rx = 0; num_rx < nb_pkts; ) { >> struct rte_mbuf *mbuf = rxq->pool; >> struct rte_mbuf *seg = NULL; >> @@ -433,6 +431,9 @@ pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) >> rxq->stats.ipackets += num_rx; >> rxq->stats.ibytes += num_rx_bytes; >> >> + if (trigger && num_rx < nb_pkts) >> + rxq->trigger_seen = trigger; >> + >> return num_rx; > > Looks reasonable to me. I was looking at the code for this patch and noticed what I believe is a bit odd. > > The line around 1352 does set req->trigger_seen = 1;, but the tap_trigger global variable is always set to tap_trigger = (tap_trigger + 1) | 0x80000000; in the signal handler. > Just seems the line around 1352 should be set to at least 0x80000001 to begin with just to be constant. Not for this patch and maybe it does not matter in the long run. > > > Reviewed-by: Keith Wiles Applied to dpdk-next-net/master, thanks.