[dpdk-dev] [PATCH] eal/linux: fix phys addresses not avaialbe for Xen dom0

[Jianfeng Tan <jianfeng.tan@intel.com>]

When physical NICs are binded to igb_uio/uio-pci-generic, they cannot
be used in DPDK app in Xen dom0.

Due to (1) a restriction that phys addresses should be availabe is added
by commit cdc242f260e7 ("eal/linux: support running as unprivileged user"),
(2) and previous implementation of the test to check if phys addresses are
available (using a variable on the stack) just works for non-Xen
environment. Actually, for Xen dom0, the physical addresses are always
available if the memory is initialized successfully..

To fix it, we add an precheck to bypass the physical address availability
test.

Fixes: cdc242f260e7 ("eal/linux: support running as unprivileged user")

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
 lib/librte_eal/linuxapp/eal/eal_memory.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
index 618a09b..ebe0683 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -133,6 +133,10 @@ test_phys_addrs_available(void)
 	uint64_t tmp;
 	phys_addr_t physaddr;
 
+	/* For dom0, phys addresses can always be available */
+	if (rte_xen_dom0_supported())
+		return;
+
 	physaddr = rte_mem_virt2phy(&tmp);
 	if (physaddr == RTE_BAD_PHYS_ADDR) {
 		RTE_LOG(ERR, EAL,
-- 
2.7.4