[dpdk-dev] [PATCH v2] igb_uio: add config option to control reset

[Ferruh Yigit <ferruh.yigit@intel.com>]

Adding a compile time configuration option to control device reset done
during DPDK application exit.

Config option is CONFIG_RTE_EAL_IGB_UIO_RESET and enabled by default,
so by default reset will happen. Having this reset is safer to be sure
device left in a proper case.

But for special cases [1] it is possible to disable the config option
to prevent the device reset.

[1]
http://dpdk.org/ml/archives/dev/2017-November/080927.html

Fixes: b58eedfc7dd5 ("igb_uio: issue FLR during open and release of device file")
Cc: stable@dpdk.org

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
---
Cc: Jianfeng Tan <jianfeng.tan@intel.com>
Cc: Jingjing Wu <jingjing.wu@intel.com>
Cc: Shijith Thotton <shijith.thotton@caviumnetworks.com>
Cc: Gregory Etelson <gregory@weka.io>
Cc: Harish Patil <harish.patil@cavium.com>
Cc: George Prekas <george.prekas@epfl.ch>
Cc: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>
Cc: Rasesh Mody <rasesh.mody@cavium.com>

v2:
* fix typo in commit log
---
 config/common_base                        | 1 +
 config/common_linuxapp                    | 1 +
 lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 2 ++
 3 files changed, 4 insertions(+)

diff --git a/config/common_base b/config/common_base
index 82ee75456..2a9947420 100644
--- a/config/common_base
+++ b/config/common_base
@@ -102,6 +102,7 @@ CONFIG_RTE_LIBEAL_USE_HPET=n
 CONFIG_RTE_EAL_ALLOW_INV_SOCKET_ID=n
 CONFIG_RTE_EAL_ALWAYS_PANIC_ON_ERROR=n
 CONFIG_RTE_EAL_IGB_UIO=n
+CONFIG_RTE_EAL_IGB_UIO_RESET=n
 CONFIG_RTE_EAL_VFIO=n
 CONFIG_RTE_MALLOC_DEBUG=n
 CONFIG_RTE_EAL_NUMA_AWARE_HUGEPAGES=n
diff --git a/config/common_linuxapp b/config/common_linuxapp
index 74c7d64ec..b3a602909 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -37,6 +37,7 @@ CONFIG_RTE_EXEC_ENV_LINUXAPP=y
 
 CONFIG_RTE_EAL_NUMA_AWARE_HUGEPAGES=y
 CONFIG_RTE_EAL_IGB_UIO=y
+CONFIG_RTE_EAL_IGB_UIO_RESET=y
 CONFIG_RTE_EAL_VFIO=y
 CONFIG_RTE_KNI_KMOD=y
 CONFIG_RTE_LIBRTE_KNI=y
diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index fd320d87d..0325722c0 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -360,7 +360,9 @@ igbuio_pci_release(struct uio_info *info, struct inode *inode)
 	/* stop the device from further DMA */
 	pci_clear_master(dev);
 
+#ifdef RTE_EAL_IGB_UIO_RESET
 	pci_reset_function(dev);
+#endif
 
 	return 0;
 }
-- 
2.13.6