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 4C437A046B for ; Thu, 25 Jul 2019 13:01:33 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 1F1021C2F9; Thu, 25 Jul 2019 13:01:33 +0200 (CEST) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by dpdk.org (Postfix) with ESMTP id EDA9B1C2EF; Thu, 25 Jul 2019 13:01:28 +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 orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Jul 2019 04:01:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,306,1559545200"; d="scan'208";a="321631308" 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 04:01:26 -0700 To: David Marchand Cc: dev , dpdk stable , "A.McLoughlin" References: <1563969270-29669-1-git-send-email-david.marchand@redhat.com> <1563969270-29669-3-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-stable] [PATCH 2/3] net/pcap: fix transmit return count in error conditions X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" On 7/25/2019 8:40 AM, David Marchand wrote: > On Wed, Jul 24, 2019 at 8:36 PM Ferruh Yigit wrote: >> >> On 7/24/2019 12:54 PM, David Marchand wrote: >>> When a packet cannot be transmitted, the driver is supposed to free this >>> packet and report it as handled. >>> This is to prevent the application from retrying to send the same packet >>> and ending up in a liveloop since the driver will never manage to send >>> it. >>> >>> Fixes: 49a0a2ffd5db ("net/pcap: fix possible mbuf double freeing") >>> Fixes: 6db141c91e1f ("pcap: support jumbo frames") >>> CC: stable@dpdk.org >>> >>> Signed-off-by: David Marchand >>> --- >>> drivers/net/pcap/rte_eth_pcap.c | 18 ++++++++++-------- >>> 1 file changed, 10 insertions(+), 8 deletions(-) >>> >>> diff --git a/drivers/net/pcap/rte_eth_pcap.c b/drivers/net/pcap/rte_eth_pcap.c >>> index 470867d..5e5aab7 100644 >>> --- a/drivers/net/pcap/rte_eth_pcap.c >>> +++ b/drivers/net/pcap/rte_eth_pcap.c >>> @@ -354,7 +354,8 @@ struct pmd_devargs_all { >>> mbuf->pkt_len, >>> RTE_ETHER_MAX_JUMBO_FRAME_LEN); >>> >>> - break; >>> + rte_pktmbuf_free(mbuf); >>> + continue; >> >> +1 >> Very recently 'rte_pktmbuf_free()' was moved because it wasn't compatible with >> return value, but this looks better, to free the mbuf and record it as error. >> >>> } >>> } >>> >>> @@ -373,7 +374,7 @@ struct pmd_devargs_all { >>> dumper_q->tx_stat.bytes += tx_bytes; >>> dumper_q->tx_stat.err_pkts += nb_pkts - num_tx; >>> >>> - return num_tx; >>> + return nb_pkts; >>> } >>> >>> /* >>> @@ -439,14 +440,15 @@ struct pmd_devargs_all { >>> mbuf->pkt_len, >>> RTE_ETHER_MAX_JUMBO_FRAME_LEN); >>> >>> - break; >>> + rte_pktmbuf_free(mbuf); >>> + continue; >>> } >>> } >>> >>> - if (unlikely(ret != 0)) >>> - break; >>> - num_tx++; >>> - tx_bytes += mbuf->pkt_len; >>> + if (ret == 0) { >>> + num_tx++; >>> + tx_bytes += mbuf->pkt_len; >>> + } >> >> I don't know this part, this is in 'eth_pcap_tx()' which writes packets to the >> interfaces. >> >> if 'pcap_sendpacket()' fails this doesn't mean packet can't be sent and may >> cause a liveloop. Why not keep the existing behavior and let application to decide? > > The manual is not clear to me. > Do we really have temporary situations where retries are fine? Same here, I am not that clear, I assume these situations exists, specially taking into account nobody complaining about existing implementation. > and if > so, can we differentiate them from things like incorrect permissions > etc... > > If we can't, dropping is safer. > May not differentiate them, because all we are getting is the fail from API without reason. But overall instead of driving freeing a packet, it feels better to leave this decision to application unless driver needs to free it. Other changes in the patchset is fixing defects in driver, only this part changes behavior without a clear defect, I am leaning to keep old behavior.