From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 6AABE2661; Wed, 2 Aug 2017 20:02:16 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8B0FA77542; Wed, 2 Aug 2017 18:02:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 8B0FA77542 Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=aconole@redhat.com Received: from dhcp-25-97.bos.redhat.com (unknown [10.18.25.172]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0007B7F8F5; Wed, 2 Aug 2017 18:02:14 +0000 (UTC) From: Aaron Conole To: dev@dpdk.org Cc: stable@dpdk.org, John Daley , Bruce Richardson Date: Wed, 2 Aug 2017 14:02:13 -0400 Message-Id: <20170802180213.28736-1-aconole@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 02 Aug 2017 18:02:15 +0000 (UTC) Subject: [dpdk-dev] [PATCH] enic: check for nb_free > 0 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: , X-List-Received-Date: Wed, 02 Aug 2017 18:02:16 -0000 Occasionally, the amount of packets to free from the work queue ends perfectly on a boundary to have nb_free = 0 and pool = 0. This causes a segfault as follows: (gdb) bt #0 rte_mempool_default_cache (mp=, mp=, lcore_id=) at /usr/src/debug/openvswitch-2.6.1/dpdk-16.11/x86_64-native-linuxapp-gcc/include/rte_mempool.h:1017 #1 rte_mempool_put_bulk (n=0, obj_table=0x7f10deff2530, mp=0x0) at /usr/src/debug/openvswitch-2.6.1/dpdk-16.11/x86_64-native-linuxapp-gcc/include/rte_mempool.h:1174 #2 enic_free_wq_bufs (wq=wq@entry=0x7efabffcd5b0, completed_index=completed_index@entry=33) at /usr/src/debug/openvswitch-2.6.1/dpdk-16.11/drivers/net/enic/enic_rxtx.c:429 #3 0x00007f11e9c86e17 in enic_cleanup_wq (enic=, wq=wq@entry=0x7efabffcd5b0) at /usr/src/debug/openvswitch-2.6.1/dpdk-16.11/drivers/net/enic/enic_rxtx.c:442 #4 0x00007f11e9c86e5f in enic_xmit_pkts (tx_queue=0x7efabffcd5b0, tx_pkts=0x7f10deffb1a8, nb_pkts=) at /usr/src/debug/openvswitch-2.6.1/dpdk-16.11/drivers/net/enic/enic_rxtx.c:470 #5 0x00007f11e9e147ad in rte_eth_tx_burst (nb_pkts=, tx_pkts=0x7f10deffb1a8, queue_id=0, port_id=) This commit makes the enic wq driver match other drivers who call the bulk free, by checking that there are actual packets to free. Fixes: 36935afbc53c ("net/enic: refactor Tx mbuf recycling") CC: stable@dpdk.org Reported-by: Vincent S. Cojot Reported-at: https://bugzilla.redhat.com/show_bug.cgi?id=1468631 Signed-off-by: Aaron Conole --- drivers/net/enic/enic_rxtx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/enic/enic_rxtx.c b/drivers/net/enic/enic_rxtx.c index 5867acf..a39172f 100644 --- a/drivers/net/enic/enic_rxtx.c +++ b/drivers/net/enic/enic_rxtx.c @@ -503,7 +503,8 @@ static inline void enic_free_wq_bufs(struct vnic_wq *wq, u16 completed_index) tail_idx = enic_ring_incr(desc_count, tail_idx); } - rte_mempool_put_bulk(pool, (void **)free, nb_free); + if (nb_free > 0) + rte_mempool_put_bulk(pool, (void **)free, nb_free); wq->tail_idx = tail_idx; wq->ring.desc_avail += nb_to_free; -- 2.9.4