From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id C9E394F94 for ; Wed, 17 Oct 2018 14:06:50 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Oct 2018 05:06:49 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,392,1534834800"; d="scan'208";a="273173287" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.49]) ([10.237.221.49]) by fmsmga006.fm.intel.com with ESMTP; 17 Oct 2018 05:06:48 -0700 To: Raslan Darawsheh , keith.wiles@intel.com Cc: thomas@monjalon.net, dev@dpdk.org, shahafs@mellanox.com, orika@mellanox.com References: <1539182356-15496-2-git-send-email-rasland@mellanox.com> <1539766564-9433-1-git-send-email-rasland@mellanox.com> <1539766564-9433-3-git-send-email-rasland@mellanox.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1539766564-9433-3-git-send-email-rasland@mellanox.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v7 3/3] net/tap: allow secondary process to access primary device queues 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, 17 Oct 2018 12:06:51 -0000 On 10/17/2018 9:56 AM, Raslan Darawsheh wrote: > @@ -2082,6 +2214,16 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev) > TAP_LOG(NOTICE, "Initializing pmd_tap for %s as %s", > name, tap_name); > > + /* Register IPC feed callback */ > + if (!tap_devices_count) { > + ret = rte_mp_action_register(TAP_MP_KEY, tap_mp_sync_queues); > + if (ret < 0) { > + TAP_LOG(ERR, "%s: Failed to register IPC callback: %s", > + tuntap_name, strerror(rte_errno)); > + goto leave; > + } > + } > + tap_devices_count++; > ret = eth_dev_tap_create(dev, tap_name, remote_iface, &user_mac, > ETH_TUNTAP_TYPE_TAP); > > @@ -2089,6 +2231,9 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev) > if (ret == -1) { > TAP_LOG(ERR, "Failed to create pmd for %s as %s", > name, tap_name); > + if (!tap_devices_count) > + rte_mp_action_unregister(TAP_MP_KEY); > + tap_devices_count--; > tap_unit--; /* Restore the unit number */ > } > rte_kvargs_free(kvlist); Fail recovery part seems broken, it can be like [1] or [2], but both requires a new variable. I double checked the logic in prev version of the patch that uses EEXIST return values, that is also broken. Overall the challenge is in error recovery part we don't know if we enter there before or after increasing dev_count, that is why a local variable required. If you can fix the error recovery path using EEXIST without needing a new variable, I think that is better, but if not I suggest following [2] since the logic of increase the dev_count after device successfully created makes sense to me, but both works. Thanks, ferruh [1] /* Register IPC feed callback */ if (!tap_devices_count) { ret = rte_mp_action_register(TAP_MP_KEY, tap_mp_sync_queues); if (ret < 0) { TAP_LOG(ERR, "%s: Failed to register IPC callback: %s", tuntap_name, strerror(rte_errno)); goto leave; } } tap_devices_count++; tap_devices_count_increased = 1; ret = eth_dev_tap_create(dev, tap_name, remote_iface, &user_mac, ETH_TUNTAP_TYPE_TAP); leave: if (ret == -1) { TAP_LOG(ERR, "Failed to create pmd for %s as %s", name, tap_name); if (tap_devices_count_increased == 1) { if (tap_devices_count == 1) rte_mp_action_unregister(TAP_MP_KEY); tap_devices_count--; } tap_unit--; /* Restore the unit number */ } rte_kvargs_free(kvlist); [2] /* Register IPC feed callback */ if (!tap_devices_count) { ret = rte_mp_action_register(TAP_MP_KEY, tap_mp_sync_queues); if (ret < 0) { TAP_LOG(ERR, "%s: Failed to register IPC callback: %s", tuntap_name, strerror(rte_errno)); goto leave; } mp_action_registered = 1; } ret = eth_dev_tap_create(dev, tap_name, remote_iface, &user_mac, ETH_TUNTAP_TYPE_TAP); leave: if (ret == -1) { TAP_LOG(ERR, "Failed to create pmd for %s as %s", name, tap_name); if (mp_action_registered == 1) rte_mp_action_unregister(TAP_MP_KEY); tap_unit--; /* Restore the unit number */ } else { tap_devices_count++; } rte_kvargs_free(kvlist);