From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id C52E82BD3 for ; Mon, 25 Mar 2019 14:51:44 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Mar 2019 06:51:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,269,1549958400"; d="scan'208";a="310239891" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.46]) ([10.237.221.46]) by orsmga005.jf.intel.com with ESMTP; 25 Mar 2019 06:51:42 -0700 To: Matan Azrad , Stephen Hemminger Cc: "dev@dpdk.org" References: <20190313021253.525-1-stephen@networkplumber.org> <20190314084435.2cca9735@shemminger-XPS-13-9360> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; prefer-encrypt=mutual; keydata= mQINBFXZCFABEADCujshBOAaqPZpwShdkzkyGpJ15lmxiSr3jVMqOtQS/sB3FYLT0/d3+bvy qbL9YnlbPyRvZfnP3pXiKwkRoR1RJwEo2BOf6hxdzTmLRtGtwWzI9MwrUPj6n/ldiD58VAGQ +iR1I/z9UBUN/ZMksElA2D7Jgg7vZ78iKwNnd+vLBD6I61kVrZ45Vjo3r+pPOByUBXOUlxp9 GWEKKIrJ4eogqkVNSixN16VYK7xR+5OUkBYUO+sE6etSxCr7BahMPKxH+XPlZZjKrxciaWQb +dElz3Ab4Opl+ZT/bK2huX+W+NJBEBVzjTkhjSTjcyRdxvS1gwWRuXqAml/sh+KQjPV1PPHF YK5LcqLkle+OKTCa82OvUb7cr+ALxATIZXQkgmn+zFT8UzSS3aiBBohg3BtbTIWy51jNlYdy ezUZ4UxKSsFuUTPt+JjHQBvF7WKbmNGS3fCid5Iag4tWOfZoqiCNzxApkVugltxoc6rG2TyX CmI2rP0mQ0GOsGXA3+3c1MCdQFzdIn/5tLBZyKy4F54UFo35eOX8/g7OaE+xrgY/4bZjpxC1 1pd66AAtKb3aNXpHvIfkVV6NYloo52H+FUE5ZDPNCGD0/btFGPWmWRmkPybzColTy7fmPaGz cBcEEqHK4T0aY4UJmE7Ylvg255Kz7s6wGZe6IR3N0cKNv++O7QARAQABtCVGZXJydWggWWln aXQgPGZlcnJ1aC55aWdpdEBpbnRlbC5jb20+iQJVBBMBAgA/AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBNI2U4dCLsKE45mBx/kz60PfE2EfBQJbughWBQkHwjOGAAoJEPkz60Pf E2Eft84QAIbKWqhgqRfoiw/BbXbA1+qm2o4UgkCRQ0yJgt9QsnbpOmPKydHH0ixCliNz1J8e mRXCkMini1bTpnzp7spOjQGLeAFkNFz6BMq8YF2mVWbGEDE9WgnAxZdi0eLY7ZQnHbE6AxKL SXmpe9INb6z3ztseFt7mqje/W/6DWYIMnH3Yz9KzxujFWDcq8UCAvPkxVQXLTMpauhFgYeEx Nub5HbvhxTfUkapLwRQsSd/HbywzqZ3s/bbYMjj5JO3tgMiM9g9HOjv1G2f1dQjHi5YQiTZl 1eIIqQ3pTic6ROaiZqNmQFXPsoOOFfXF8nN2zg8kl/sSdoXWHhama5hbwwtl1vdaygQYlmdK H2ueiFh/UvT3WG3waNv2eZiEbHV8Rk52Xyn2w1G90lV0fYC6Ket1Xjoch7kjwbx793Kz/RfQ rmBY8/S4DTGn3oq3dMdQY+b6+7VMUeLMMh2CXYO9ErkOq+qNTD1IY+cBAkXnaDbQfz0zbste ZGWH74FAZ9nCpDOqbRTrBL42aMGhfOWEyeA1x7+hl6JZfabBWAuf4nnCXuorKHzBXTrf7u7p fXsKQClWRW77PF1VmzrtKNVSytQAmlCWApQIw20AarFipXmVdIjHmJPU611WoyxZPb4JTOxx 5cv9B+nr/RIB+v5dcStyHCCwO1be7nBDdCgd4F6kTQPLuQINBFfWTL4BEACnNA29e8TarUsB L5n6eLZHXcFvVwNLVlirWOClHXf44o2KnN3ww+eBEmKVfEFo9MSuGDNHS8Zw1NiGMYxLIUgd U6gGrVVs/VrQWL82pbMk6jCj98N+BXIri+6K1z+AImz7ax7iF1kDgRAnFWU0znWWBgM2mM8Y gDjcxfXk4sCKnvf6Gjo08Ey5zmqx7dekAKU2EEp8Q1EJY3jbymLdZWRP4AFFMTS1rGMk0/tt v71NBg1GobCcbNfn9chK/jhqxYhAJqq86RdJQkt3/9x1U1Oq0vXCt4JVVHmkxePtUiuWTTt+ aYlUAsKYZsWvncExvw77x2ArYDmaK0yfjh37wp0lY7DOJHFxoyT8tyWZlLci/VMRG2Ja33xj 0CN4C1yBg+QDeV3QFxQo42iA/ykdXPUR3ezmsND3XKvVLTC4DNb3V/EZQ7jBj64+bEK0VW4G B31VP00ApNQvSoczsIOAKdk97RNbpmPw6q10ILIB+9T1xbnFYzshzGF17oC0/GENIHATx8vZ masOZoDiOZQpeneLgnFE9JfzhLTxv6wNZcc/HLXRQVTkDsQr8ERtkAoHCf1E5+b5Yr7pfnE4 YuhET746o25S53ELUYPIs49qoJsEJL34/oexMfPGyPIlrbufiNyty5jc/1MRwUlhJlJ5IOHy ZUa+6CLR7GdImusFkPJUJwARAQABiQI8BBgBAgAmAhsMFiEE0jZTh0IuwoTjmYHH+TPrQ98T YR8FAlu6CHAFCQXE7zIACgkQ+TPrQ98TYR9nXxAAqNBgkYNyGuWUuy0GwDQCbu3iiMyH1+D7 llafPcK4NYy1Z4AYuVwC9nmLaoj+ozdqS3ncRo57ncRsKEJC46nDJJZYZ5LSJVn63Y3NBF86 lxQAgjj2oyZEwaLKtKbAFsXL43jv1pUGgSvWwYtDwHITXXFQto9rZEuUDRFSx4sg9OR+Q6/6 LY+nQQ3OdHlBkflzYMPcWgDcvcTAO6yasLEUf7UcYoSWTyMYjLB4QuNlXzTswzGVMssJF/vo V8lD1eqqaSUWG3STF6GVLQOr1NLvN5+kUBiEStHFxBpgSCvYY9sNV8FS6N24CAWMBl+10W+D 2h1yiiP5dOdPcBDYKsgqDD91/sP0WdyMJkwdQJtD49f9f+lYloxHnSAxMleOpyscg1pldw+i mPaUY1bmIknLhhkqfMmjywQOXpac5LRMibAAYkcB8v7y3kwELnt8mhqqZy6LUsqcWygNbH/W K3GGt5tRpeIXeJ25x8gg5EBQ0Jnvp/IbBYQfPLtXH0Myq2QuAhk/1q2yEIbVjS+7iowEZNyE 56K63WBJxsJPB2mvmLgn98GqB4G6GufP1ndS0XDti/2K0o8rep9xoY/JDGi0n0L0tk9BHyoP Y7kaEpu7UyY3nVdRLe5H1/MnFG8hdJ97WqnPS0buYZlrbTV0nRFL/NI2VABl18vEEXvNQiO+ vM8= Message-ID: <631bc9fd-5ed9-af31-1a52-7de9ab0205aa@intel.com> Date: Mon, 25 Mar 2019 13:51:42 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast 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: Mon, 25 Mar 2019 13:51:45 -0000 On 3/17/2019 6:16 AM, Matan Azrad wrote: > Hi > > From: Stephen Hemminger >>> Hi >>> >>> From: Stephen Hemminger >>>> The return value from bus->find_device is a rte_device which is not >>>> safe to cast to a rte_vdev_device structure. >>>> It doesn't really matter since only being checked for NULL but >>>> static checkers might find a bug here. >>>> >>> >>> Fix line is missing. >>> >>>> Signed-off-by: Stephen Hemminger >>>> --- >>>> drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++--- >>>> 1 file changed, 4 insertions(+), 3 deletions(-) >>>> >>>> diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c >>>> b/drivers/net/vdev_netvsc/vdev_netvsc.c >>>> index ba63fac2a598..801f54c96e01 100644 >>>> --- a/drivers/net/vdev_netvsc/vdev_netvsc.c >>>> +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c >>>> @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct >>>> rte_device *dev1, static void >>>> vdev_netvsc_scan_callback(__rte_unused >>>> void *arg) { >>>> - struct rte_vdev_device *dev; >>>> + struct rte_device *dev; >>>> struct rte_devargs *devargs; >>>> struct rte_bus *vbus = rte_bus_find_by_name("vdev"); >>>> >>>> @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void >> *arg) >>>> if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME, >>>> VDEV_NETVSC_DRIVER_NAME_LEN)) >>>> return; >>>> - dev = (struct rte_vdev_device *)vbus->find_device(NULL, >>>> - vdev_netvsc_cmp_rte_device, >>>> VDEV_NETVSC_DRIVER_NAME); >>>> + >>>> + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device, >>>> + VDEV_NETVSC_DRIVER_NAME); >>> >>> Since the device must be vdev here, >>> It is better to use explicit cast to make the checker happy. >> >> The cast is converting from rte_device to rte_vdev_device which incorrect. >> >> The device returned by vbus->find_device is a rte_device not a >> rte_vdev_device: >> >> vbus->find_device points to rte_vdev_find_device >> >> struct rte_device * >> rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp, >> const void *data) >> >> but definition of rte_vdev_device is: >> >> struct rte_vdev_device { >> TAILQ_ENTRY(rte_vdev_device) next; /**< Next attached vdev */ >> struct rte_device device; /**< Inherit core device */ >> }; >> >> The only safe way to get rte_vdev_device would be to use container_of(). >> >> dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device, >> VDEV_NETVSC_DRIVER_NAME); >> vdev = dev ? container_of(dev, struct rte_vdev_device, device) : >> NULL; >> >> But as the PATCH demonstrated, this is not necessary. > > Yes, you right. > Please add fix line to the patch + stable line. Adding explicit cast from Matan: Acked-by: Matan Azrad Fixes: 56252de779a6 ("net/vdev_netvsc: add automatic probing") Cc: stable@dpdk.org Applied to dpdk-next-net/master, thanks. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id CC1E5A05D3 for ; Mon, 25 Mar 2019 14:51:46 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id C09C82BF4; Mon, 25 Mar 2019 14:51:45 +0100 (CET) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id C52E82BD3 for ; Mon, 25 Mar 2019 14:51:44 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Mar 2019 06:51:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,269,1549958400"; d="scan'208";a="310239891" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.46]) ([10.237.221.46]) by orsmga005.jf.intel.com with ESMTP; 25 Mar 2019 06:51:42 -0700 To: Matan Azrad , Stephen Hemminger Cc: "dev@dpdk.org" References: <20190313021253.525-1-stephen@networkplumber.org> <20190314084435.2cca9735@shemminger-XPS-13-9360> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast 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: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Message-ID: <20190325135142.X_vXyr3mcJKW-XnZ20GMHCQp9SyKLdnsXA5CQ8wGYEk@z> On 3/17/2019 6:16 AM, Matan Azrad wrote: > Hi > > From: Stephen Hemminger >>> Hi >>> >>> From: Stephen Hemminger >>>> The return value from bus->find_device is a rte_device which is not >>>> safe to cast to a rte_vdev_device structure. >>>> It doesn't really matter since only being checked for NULL but >>>> static checkers might find a bug here. >>>> >>> >>> Fix line is missing. >>> >>>> Signed-off-by: Stephen Hemminger >>>> --- >>>> drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++--- >>>> 1 file changed, 4 insertions(+), 3 deletions(-) >>>> >>>> diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c >>>> b/drivers/net/vdev_netvsc/vdev_netvsc.c >>>> index ba63fac2a598..801f54c96e01 100644 >>>> --- a/drivers/net/vdev_netvsc/vdev_netvsc.c >>>> +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c >>>> @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct >>>> rte_device *dev1, static void >>>> vdev_netvsc_scan_callback(__rte_unused >>>> void *arg) { >>>> - struct rte_vdev_device *dev; >>>> + struct rte_device *dev; >>>> struct rte_devargs *devargs; >>>> struct rte_bus *vbus = rte_bus_find_by_name("vdev"); >>>> >>>> @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void >> *arg) >>>> if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME, >>>> VDEV_NETVSC_DRIVER_NAME_LEN)) >>>> return; >>>> - dev = (struct rte_vdev_device *)vbus->find_device(NULL, >>>> - vdev_netvsc_cmp_rte_device, >>>> VDEV_NETVSC_DRIVER_NAME); >>>> + >>>> + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device, >>>> + VDEV_NETVSC_DRIVER_NAME); >>> >>> Since the device must be vdev here, >>> It is better to use explicit cast to make the checker happy. >> >> The cast is converting from rte_device to rte_vdev_device which incorrect. >> >> The device returned by vbus->find_device is a rte_device not a >> rte_vdev_device: >> >> vbus->find_device points to rte_vdev_find_device >> >> struct rte_device * >> rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp, >> const void *data) >> >> but definition of rte_vdev_device is: >> >> struct rte_vdev_device { >> TAILQ_ENTRY(rte_vdev_device) next; /**< Next attached vdev */ >> struct rte_device device; /**< Inherit core device */ >> }; >> >> The only safe way to get rte_vdev_device would be to use container_of(). >> >> dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device, >> VDEV_NETVSC_DRIVER_NAME); >> vdev = dev ? container_of(dev, struct rte_vdev_device, device) : >> NULL; >> >> But as the PATCH demonstrated, this is not necessary. > > Yes, you right. > Please add fix line to the patch + stable line. Adding explicit cast from Matan: Acked-by: Matan Azrad Fixes: 56252de779a6 ("net/vdev_netvsc: add automatic probing") Cc: stable@dpdk.org Applied to dpdk-next-net/master, thanks.