From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id 4E1E4282 for ; Wed, 10 Dec 2014 12:46:29 +0100 (CET) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 10 Dec 2014 03:46:27 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,552,1413270000"; d="scan'208";a="645397346" Received: from shvmail01.sh.intel.com ([10.239.29.42]) by fmsmga002.fm.intel.com with ESMTP; 10 Dec 2014 03:46:27 -0800 Received: from shecgisg003.sh.intel.com (shecgisg003.sh.intel.com [10.239.29.90]) by shvmail01.sh.intel.com with ESMTP id sBABkLnh021142; Wed, 10 Dec 2014 19:46:21 +0800 Received: from shecgisg003.sh.intel.com (localhost [127.0.0.1]) by shecgisg003.sh.intel.com (8.13.6/8.13.6/SuSE Linux 0.8) with ESMTP id sBABkJ2R008252; Wed, 10 Dec 2014 19:46:21 +0800 Received: (from dayuqiu@localhost) by shecgisg003.sh.intel.com (8.13.6/8.13.6/Submit) id sBABkIDT008248; Wed, 10 Dec 2014 19:46:18 +0800 From: Michael Qiu To: dev@dpdk.org Date: Wed, 10 Dec 2014 19:46:17 +0800 Message-Id: <1418211977-8218-1-git-send-email-michael.qiu@intel.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1418035455-9434-1-git-send-email-michael.qiu@intel.com> References: <1418035455-9434-1-git-send-email-michael.qiu@intel.com> Subject: [dpdk-dev] [PATCH v6] VFIO: Avoid to enable vfio while the module not loaded X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Dec 2014 11:46:30 -0000 When vfio module is not loaded when kernel support vfio feature, the routine still try to open the container to get file description. This action is not safe, and of cause got error messages: EAL: Detected 40 lcore(s) EAL: unsupported IOMMU type! EAL: VFIO support could not be initialized EAL: Setting up memory... This may make user confuse, this patch make it reasonable and much more soomth to user. Signed-off-by: Michael Qiu --- v6 --> v5 1. Change rte_eal_check_module() to normal function instead of inline 2. limit fscanf to get 29 charactors not include '\0' lib/librte_eal/common/eal_private.h | 14 ++++++++++++++ lib/librte_eal/linuxapp/eal/eal.c | 27 +++++++++++++++++++++++++++ lib/librte_eal/linuxapp/eal/eal_pci_vfio.c | 26 +++++++++++++++++++++++--- 3 files changed, 64 insertions(+), 3 deletions(-) diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h index 232fcec..2c751c6 100644 --- a/lib/librte_eal/common/eal_private.h +++ b/lib/librte_eal/common/eal_private.h @@ -203,4 +203,18 @@ int rte_eal_alarm_init(void); */ int rte_eal_dev_init(void); +/** + * Function is to check if the kernel module(like, vfio, vfio_iommu_type1, + * etc.) loaded. + * + * @param module_name + * The module's name which need to be checked + * + * @return + * -1 means some error happens(NULL pointer or open failure) + * 0 means the module not loaded + * 1 means the module loaded + */ +int rte_eal_check_module(const char *module_name); + #endif /* _EAL_PRIVATE_H_ */ diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c index 89f3b5e..9c1a1cc 100644 --- a/lib/librte_eal/linuxapp/eal/eal.c +++ b/lib/librte_eal/linuxapp/eal/eal.c @@ -859,3 +859,30 @@ int rte_eal_has_hugepages(void) { return ! internal_config.no_hugetlbfs; } + +int +rte_eal_check_module(const char *module_name) +{ + char mod_name[30]; /* Any module names can be longer than 30 bytes? */ + int ret = 0; + + if (NULL == module_name) + return -1; + + FILE * fd = fopen("/proc/modules", "r"); + if (NULL == fd) { + RTE_LOG(ERR, EAL, "Open /proc/modules failed!" + " error %i (%s)\n", errno, strerror(errno)); + return -1; + } + while(!feof(fd)) { + fscanf(fd, "%29s %*[^\n]", mod_name); + if(!strcmp(mod_name, module_name)) { + ret = 1; + break; + } + } + fclose(fd); + + return ret; +} diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c index c1246e8..16fe10f 100644 --- a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c +++ b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c @@ -44,6 +44,7 @@ #include #include #include +#include #include "eal_filesystem.h" #include "eal_pci_init.h" @@ -339,10 +340,12 @@ pci_vfio_get_container_fd(void) ret = ioctl(vfio_container_fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU); if (ret != 1) { if (ret < 0) - RTE_LOG(ERR, EAL, " could not get IOMMU type, " - "error %i (%s)\n", errno, strerror(errno)); + RTE_LOG(ERR, EAL, " could not get IOMMU type," + " error %i (%s)\n", errno, + strerror(errno)); else - RTE_LOG(ERR, EAL, " unsupported IOMMU type!\n"); + RTE_LOG(ERR, EAL, " unsupported IOMMU type" + " detected in VFIO\n"); close(vfio_container_fd); return -1; } @@ -783,11 +786,28 @@ pci_vfio_enable(void) { /* initialize group list */ int i; + int module_vfio_type1; for (i = 0; i < VFIO_MAX_GROUPS; i++) { vfio_cfg.vfio_groups[i].fd = -1; vfio_cfg.vfio_groups[i].group_no = -1; } + + module_vfio_type1 = rte_eal_check_module("vfio_iommu_type1"); + + /* return error directly */ + if (module_vfio_type1 == -1) { + RTE_LOG(INFO, EAL, "Could not get loaded module details!\n"); + return -1; + } + + /* return 0 if VFIO modules not loaded */ + if (module_vfio_type1 == 0) { + RTE_LOG(INFO, EAL, "VFIO modules not all loaded," + " skip VFIO support ...\n"); + return 0; + } + vfio_cfg.vfio_container_fd = pci_vfio_get_container_fd(); /* check if we have VFIO driver enabled */ -- 1.9.3