From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <laswell@infiniteio.com>
Received: from mail-ig0-f175.google.com (mail-ig0-f175.google.com
 [209.85.213.175]) by dpdk.org (Postfix) with ESMTP id 436329A9F
 for <dev@dpdk.org>; Tue, 10 Mar 2015 16:47:04 +0100 (CET)
Received: by igbhl2 with SMTP id hl2so32151376igb.3
 for <dev@dpdk.org>; Tue, 10 Mar 2015 08:47:03 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20130820;
 h=x-gm-message-state:mime-version:date:message-id:subject:from:to
 :content-type;
 bh=/pHhOLSaYFGY3utKJrOccPIzwfRyz+EgmjdQpQv3GtM=;
 b=bpx+ibz9RXPK+0k90T9tv5HvnyHwIUr2X/x24WumBeFFDi2EHX64bjWMtDOaARMTCg
 kuHnDCdyvcV7t36eEInX8ipYzZFo4+wgNV63bFb0hrgGwVOKn3ODH9CL6IyCKWYeS/Wf
 Z1rvozPM7+8HdWbvs6D0WJtzDQ4BMQ4BGcy1+b7uOttaLaOzHz7md6uwZ92C5kAKw74b
 H+1uAp6nsT/El5K4Ocg1QPgkapqfS118TmWqrplOCpuWhDjhejJvxe8aI9NA4NC9DXam
 08C8ALwu7TXoO1rvrcuFhGbCtmPVtYLIdJDusZ/r/sun1QUPwzAYIiTdPazqeplov3lZ
 xk/g==
X-Gm-Message-State: ALoCoQkxXwhHprfcGP8POtP4ILBfWyEjZWMBTR5gU7Tkk6LSk5+X/D4pwLC4bxKfIaLMwgagn6WG
MIME-Version: 1.0
X-Received: by 10.42.81.195 with SMTP id a3mr36085483icl.76.1426002423545;
 Tue, 10 Mar 2015 08:47:03 -0700 (PDT)
Received: by 10.36.1.207 with HTTP; Tue, 10 Mar 2015 08:47:03 -0700 (PDT)
Date: Tue, 10 Mar 2015 10:47:03 -0500
Message-ID: <CA+GnqArTcrafX0o82JCnGy7kQ6d+w+yYu8gJVequnNfF-hJoKQ@mail.gmail.com>
From: Matt Laswell <laswell@infiniteio.com>
To: "dev@dpdk.org" <dev@dpdk.org>
Content-Type: text/plain; charset=UTF-8
X-Content-Filtered-By: Mailman/MimeDel 2.1.15
Subject: [dpdk-dev] Question about link up/down events and transmit queues
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Tue, 10 Mar 2015 15:47:04 -0000

Hey Folks,

I'm running into an issue that I hope is obvious and simple.  We're running
DPDK 1.6.2 with an 82599 NIC.  We find that if, while running traffic, we
disconnect a port and then later reconnect it, we never regain the ability
to transmit packets out of that port after it comes back up.
Specifically, our calls to rte_eth_tx_burst() get return values that
indicate that no packets could be sent.

Is there an additional step that we have to do on link down/up operations,
perhaps to tell the NIC to flush its descriptor ring?

Thanks in advance for your help.

--
Matt Laswell
*infinite io, inc.*
laswell@infiniteio.com