[dpdk-dev] [PATCH] igb_uio: fix build with backported kernel

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

Following compile error observed with CentOS 6.8, which uses kernel
kernel-devel-2.6.32-642.el6.x86_64:

CC eal_thread.o
.../build/lib/librte_eal/linuxapp/igb_uio/igb_uio.c:
In function 'igbuio_msix_mask_irq':
.../build/lib/librte_eal/linuxapp/igb_uio/igb_uio.c:157:
error: 'PCI_MSIX_ENTRY_CTRL_MASKBIT' undeclared (first use in this
function)

Reported-by: Thiago <thiagocmartinsc@gmail.com>
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
---
 lib/librte_eal/linuxapp/igb_uio/compat.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/librte_eal/linuxapp/igb_uio/compat.h b/lib/librte_eal/linuxapp/igb_uio/compat.h
index c1d45a6..0d781e4 100644
--- a/lib/librte_eal/linuxapp/igb_uio/compat.h
+++ b/lib/librte_eal/linuxapp/igb_uio/compat.h
@@ -24,6 +24,15 @@
 #define   PCI_MSIX_ENTRY_CTRL_MASKBIT   1
 #endif
 
+/*
+ * for kernels < 2.6.38 and backported patch that moves MSI-X entry definition
+ * to pci_regs.h Those kernels has PCI_MSIX_ENTRY_SIZE defined but not
+ * PCI_MSIX_ENTRY_CTRL_MASKBIT
+ */
+#ifndef PCI_MSIX_ENTRY_CTRL_MASKBIT
+#define PCI_MSIX_ENTRY_CTRL_MASKBIT    1
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 34) && \
 	(!(defined(RHEL_RELEASE_CODE) && \
 	 RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(5, 9)))
-- 
2.5.5