[dpdk-dev] [PATCH 1/2] eal: add flag to force unbind device

[Damien Millescamps <damien.millescamps@6wind.com>]

Some devices need to be unbound in order to be used via the PMD
without kernel module.

Signed-off-by: Damien Millescamps <damien.millescamps@6wind.com>
---
 lib/librte_eal/common/include/rte_pci.h |    2 ++
 lib/librte_eal/linuxapp/eal/eal_pci.c   |    5 +++++
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
index c3937f0..6582c25 100644
--- a/lib/librte_eal/common/include/rte_pci.h
+++ b/lib/librte_eal/common/include/rte_pci.h
@@ -157,6 +157,8 @@ struct rte_pci_driver {
 #define RTE_PCI_DRV_NEED_IGB_UIO 0x0001
 /** Device driver must be registered several times until failure */
 #define RTE_PCI_DRV_MULTIPLE 0x0002
+/** Device needs to be unbound even if no module is provided */
+#define RTE_PCI_DRV_FORCE_UNBIND 0x0004
 
 /**
  * Probe the PCI bus for registered drivers.
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index 882fd6f..1d087b8 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -745,6 +745,11 @@ rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *d
 			/* map the NIC resources */
 			if (pci_uio_map_resource(dev) < 0)
 				return -1;
+		} else if (dr->drv_flags & RTE_PCI_DRV_FORCE_UNBIND &&
+		           rte_eal_process_type() == RTE_PROC_PRIMARY) {
+			/* unbind current driver, bind ours */
+			if (pci_unbind_kernel_driver(dev) < 0)
+				return -1;
 		}
 
 		/* reference driver structure */
-- 
1.7.2.5