From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out2-smtp.messagingengine.com (out2-smtp.messagingengine.com [66.111.4.26]) by dpdk.org (Postfix) with ESMTP id 20A6C378E; Sat, 2 Mar 2019 03:43:44 +0100 (CET) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id C56FC21E1D; Fri, 1 Mar 2019 21:43:43 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute1.internal (MEProxy); Fri, 01 Mar 2019 21:43:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=monjalon.net; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=mesmtp; bh=F3bGhjmFzR Kyk0vPNrtmgzboIiNm5iaCPEZ8ewFd01M=; b=BSU6nWRl1eafLGaud5wcftCrZI Vu1l9eIfV8xE/Qi+d+zbVL3YHbqSUtOP7E7pogajGCO6RIGrSnh7AD4U17BKEl4E YNGdwkPSAqKnUD47rSGMvB/8e5ZSOm7/nJb8kVo6/rqCHDr47DaO7ZXEkf75CNp4 98PK6i1hdYAcQCBnA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:date:from :in-reply-to:message-id:mime-version:references:subject:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm2; bh=F3bGhjmFzRKyk0vPNrtmgzboIiNm5iaCPEZ8ewFd01M=; b=fsvJJMdg ibXcu5gX5ggx8GKkx28FkMbNvdLq620I+02c2xMKlL8lQMq4zFJCUnr2NEWSn75a ZLAxJ1OEy1J+ASce93P5v3y8Dk3pKpqF7p/6l5d8t7z5J6VwGVrcHdtiq6OGvTjj CUaR9VYPnq2Y6UVDBh8sncC2C9LEiXQhmpz9kZTG2h+mEBtKIOV0cZPW1/aA3Shg PgG2dOzhdFIx7ASCSANK6sT+AZbD+MBy/Q1aNeSX09mjP+YXlE1TozBohcSuy70K fFjGFzT1POxeAg4ttugs4eZw00Cn+zumZdl6VzAZRiJA0Xp+mipwWLmXN0GdFrYQ ETOSQ4D7axrcJQ== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedutddrvdeigdegkecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecunecujfgurhephffvufffkffojghfggfgsedtkeertd ertddtnecuhfhrohhmpefvhhhomhgrshcuofhonhhjrghlohhnuceothhhohhmrghssehm ohhnjhgrlhhonhdrnhgvtheqnecukfhppeejjedrudefgedrvddtfedrudekgeenucfrrg hrrghmpehmrghilhhfrhhomhepthhhohhmrghssehmohhnjhgrlhhonhdrnhgvthenucev lhhushhtvghrufhiiigvpedv X-ME-Proxy: Received: from xps.monjalon.net (184.203.134.77.rev.sfr.net [77.134.203.184]) by mail.messagingengine.com (Postfix) with ESMTPA id EB2C9E40C1; Fri, 1 Mar 2019 21:43:42 -0500 (EST) From: Thomas Monjalon To: dev@dpdk.org Cc: qi.z.zhang@intel.com, stable@dpdk.org Date: Sat, 2 Mar 2019 03:42:53 +0100 Message-Id: <20190302024253.15594-4-thomas@monjalon.net> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190302024253.15594-1-thomas@monjalon.net> References: <20190302024253.15594-1-thomas@monjalon.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-stable] [PATCH 3/3] eal: fix multi-process probe failure handling 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: , X-List-Received-Date: Sat, 02 Mar 2019 02:43:44 -0000 If probe fails in multi-process context, the device must removed in other processes for consistency. This is a rollback mechanism. However the rollback should not happen for devices which were already probed before the current probe transaction. When probing an already probed device, the driver may reject with -EEXIST or update and succeed with code 0. In order to distinguish successful new probe from re-probe, in the function local_dev_probe(), the positive EEXIST code is returned for the latter case. The functions rte_dev_probe() and __handle_secondary_request() can test for -EEXIST and +EEXIST, and skip rollback in such case. Fixes: 244d5130719c ("eal: enable hotplug on multi-process") Fixes: ac9e4a17370f ("eal: support attach/detach shared device from secondary") Cc: qi.z.zhang@intel.com Cc: stable@dpdk.org Signed-off-by: Thomas Monjalon --- lib/librte_eal/common/eal_common_dev.c | 12 ++++++++++-- lib/librte_eal/common/eal_private.h | 2 +- lib/librte_eal/common/hotplug_mp.c | 8 ++++++-- 3 files changed, 17 insertions(+), 5 deletions(-) diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c index deaaea9345..2c7b1ab071 100644 --- a/lib/librte_eal/common/eal_common_dev.c +++ b/lib/librte_eal/common/eal_common_dev.c @@ -132,6 +132,7 @@ local_dev_probe(const char *devargs, struct rte_device **new_dev) { struct rte_device *dev; struct rte_devargs *da; + bool already_probed; int ret; *new_dev = NULL; @@ -171,12 +172,15 @@ local_dev_probe(const char *devargs, struct rte_device **new_dev) * those devargs shouldn't be removed manually anymore. */ + already_probed = rte_dev_is_probed(dev); ret = dev->bus->plug(dev); if (ret && !rte_dev_is_probed(dev)) { /* if hasn't ever succeeded */ RTE_LOG(ERR, EAL, "Driver cannot attach the device (%s)\n", dev->name); return ret; } + if (ret == 0 && already_probed) + ret = EEXIST; /* hint to avoid any rollback */ *new_dev = dev; return ret; @@ -194,6 +198,7 @@ rte_dev_probe(const char *devargs) { struct eal_dev_mp_req req; struct rte_device *dev; + bool already_probed; int ret; memset(&req, 0, sizeof(req)); @@ -221,8 +226,8 @@ rte_dev_probe(const char *devargs) /* primary attach the new device itself. */ ret = local_dev_probe(devargs, &dev); - - if (ret != 0 && ret != -EEXIST) { + already_probed = (ret == -EEXIST || ret == EEXIST); + if (ret < 0 && !already_probed) { RTE_LOG(ERR, EAL, "Failed to attach device on primary process\n"); return ret; @@ -250,6 +255,9 @@ rte_dev_probe(const char *devargs) return 0; rollback: + if (already_probed) + return ret; /* skip rollback */ + req.t = EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK; /* primary send rollback request to secondary. */ diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h index 798ede553b..a01d252930 100644 --- a/lib/librte_eal/common/eal_private.h +++ b/lib/librte_eal/common/eal_private.h @@ -304,7 +304,7 @@ rte_devargs_layers_parse(struct rte_devargs *devargs, * @param new_dev * new device be probed as output. * @return - * 0 on success, negative on error. + * >=0 on success (+EEXIST if already probed), negative on error. */ int local_dev_probe(const char *devargs, struct rte_device **new_dev); diff --git a/lib/librte_eal/common/hotplug_mp.c b/lib/librte_eal/common/hotplug_mp.c index 69e9a16d6a..9f8ef28a3b 100644 --- a/lib/librte_eal/common/hotplug_mp.c +++ b/lib/librte_eal/common/hotplug_mp.c @@ -90,13 +90,15 @@ __handle_secondary_request(void *param) struct rte_devargs da; struct rte_device *dev; struct rte_bus *bus; + bool already_probed = false; int ret = 0; tmp_req = *req; if (req->t == EAL_DEV_REQ_TYPE_ATTACH) { ret = local_dev_probe(req->devargs, &dev); - if (ret != 0 && ret != -EEXIST) { + already_probed = (ret == -EEXIST || ret == EEXIST); + if (ret < 0 && !already_probed) { RTE_LOG(ERR, EAL, "Failed to hotplug add device on primary\n"); goto finish; } @@ -159,7 +161,7 @@ __handle_secondary_request(void *param) goto finish; rollback: - if (req->t == EAL_DEV_REQ_TYPE_ATTACH) { + if (req->t == EAL_DEV_REQ_TYPE_ATTACH && !already_probed) { tmp_req.t = EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK; eal_dev_hotplug_request_to_secondary(&tmp_req); local_dev_remove(dev); @@ -238,6 +240,8 @@ static void __handle_primary_request(void *param) case EAL_DEV_REQ_TYPE_ATTACH: case EAL_DEV_REQ_TYPE_DETACH_ROLLBACK: ret = local_dev_probe(req->devargs, &dev); + if (ret > 0) + ret = 0; /* return only errors */ break; case EAL_DEV_REQ_TYPE_DETACH: case EAL_DEV_REQ_TYPE_ATTACH_ROLLBACK: -- 2.20.1