From mboxrd@z Thu Jan 1 00:00:00 1970 From: Darek Stojaczyk Subject: [PATCH] eal/bus: use RTE_IOVA_PA only if phys addresses are available Date: Fri, 7 Sep 2018 17:47:03 +0200 Message-ID: <20180907154703.83316-1-dariusz.stojaczyk@intel.com> Cc: Maxime Coquelin , Anatoly Burakov , Chas Williams , Darek Stojaczyk To: dev@dpdk.org, Santosh Shukla , Hemant Agrawal , Jerin Jacob Return-path: Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by dpdk.org (Postfix) with ESMTP id 008783256 for ; Fri, 7 Sep 2018 17:48:26 +0200 (CEST) List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" When neither RTE_IOVA_VA nor RTE_IOVA_PA was explicitly requested, DPDK would currently fallback to the default RTE_IOVA_PA mode and possibly encounter a failure later on if running as a non-priviledged user. Attempting to use RTE_IOVA_VA if no phys addresses are available may help in this case. Signed-off-by: Darek Stojaczyk --- lib/librte_eal/common/eal_common_bus.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c index 0943851cc..8b56979d7 100644 --- a/lib/librte_eal/common/eal_common_bus.c +++ b/lib/librte_eal/common/eal_common_bus.c @@ -236,9 +236,19 @@ rte_bus_get_iommu_class(void) mode |= bus->get_iommu_class(); } - if (mode != RTE_IOVA_VA) { - /* Use default IOVA mode */ - mode = RTE_IOVA_PA; + if (mode == RTE_IOVA_VA) + return RTE_IOVA_VA; + + if (mode & RTE_IOVA_PA) { + /* Not all buses support RTE_IOVA_VA, fallback to RTE_IOVA_PA */ + return RTE_IOVA_PA; + } + + if (rte_eal_using_phys_addrs()) { + /* Default to RTE_IOVA_PA only if it's supported */ + return RTE_IOVA_PA; } - return mode; + + /* Since RTE_IOVA_PA is unsupported, fallback to RTE_IOVA_VA */ + return RTE_IOVA_VA; } -- 2.17.1