From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 2CD46A046B for ; Thu, 25 Jul 2019 13:07:14 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 025151C2FE; Thu, 25 Jul 2019 13:07:13 +0200 (CEST) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by dpdk.org (Postfix) with ESMTP id AEC0A1C2F1; Thu, 25 Jul 2019 13:07:12 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Jul 2019 04:07:11 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,306,1559545200"; d="scan'208";a="321632904" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by orsmga004.jf.intel.com with ESMTP; 25 Jul 2019 04:07:10 -0700 To: David Marchand Cc: dpdk stable , dev References: <1563969270-29669-1-git-send-email-david.marchand@redhat.com> <1563969270-29669-4-git-send-email-david.marchand@redhat.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH 3/3] net/pcap: fix concurrent multiseg packet transmits 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 7/25/2019 9:18 AM, David Marchand wrote: > On Wed, Jul 24, 2019 at 1:55 PM David Marchand > wrote: >> >> Two cores can send multi segment packets on two different pcap ports. >> Because of this, we can't have one single buffer to linearize packets. >> >> Use rte_pktmbuf_read() to copy the packet into a buffer on the stack >> and remove eth_pcap_gather_data(). >> >> Fixes: 6db141c91e1f ("pcap: support jumbo frames") >> Cc: stable@dpdk.org >> >> Signed-off-by: David Marchand >> --- >> drivers/net/pcap/rte_eth_pcap.c | 90 +++++++++++++++-------------------------- >> 1 file changed, 32 insertions(+), 58 deletions(-) >> >> diff --git a/drivers/net/pcap/rte_eth_pcap.c b/drivers/net/pcap/rte_eth_pcap.c >> index 5e5aab7..7398b1b 100644 >> --- a/drivers/net/pcap/rte_eth_pcap.c >> +++ b/drivers/net/pcap/rte_eth_pcap.c > > [snip] > >> @@ -336,31 +323,25 @@ struct pmd_devargs_all { >> * dumper */ >> for (i = 0; i < nb_pkts; i++) { >> mbuf = bufs[i]; >> - calculate_timestamp(&header.ts); >> - header.len = mbuf->pkt_len; >> - header.caplen = header.len; >> - >> - if (likely(mbuf->nb_segs == 1)) { >> - pcap_dump((u_char *)dumper, &header, >> - rte_pktmbuf_mtod(mbuf, void*)); >> + len = rte_pktmbuf_pkt_len(mbuf); >> + if (likely(rte_pktmbuf_is_contiguous(mbuf))) { >> + data = rte_pktmbuf_mtod(mbuf, unsigned char *); >> + } else if (len <= sizeof(_data)) { >> + data = rte_pktmbuf_read(mbuf, 0, len, _data); > > We can actually skip the check on contiguous data, since > rte_pktmbuf_read returns a pointer to the mbuf data without copying. > WDYT ? Right, +1 to skip 'rte_pktmbuf_is_contiguous()' only it can be good to comment 'rte_pktmbuf_read()' usage to say it covers multi-segment too.