[dpdk-dev] [PATCH 1/3] eal/linux: add function for checking hugepages within device supported address range

[Alejandro Lucero <alejandro.lucero@netronome.com>]

 - This is needed for avoiding problems with devices not being able to address
   all the physical available memory.

Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
---
 lib/librte_eal/common/include/rte_memory.h |  6 ++++++
 lib/librte_eal/linuxapp/eal/eal_memory.c   | 27 +++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_memory.h b/lib/librte_eal/common/include/rte_memory.h
index f8dbece..67b0b28 100644
--- a/lib/librte_eal/common/include/rte_memory.h
+++ b/lib/librte_eal/common/include/rte_memory.h
@@ -256,6 +256,12 @@ rte_mem_phy2mch(uint32_t memseg_id __rte_unused, const phys_addr_t phy_addr)
 }
 #endif
 
+/**
+ * Check hugepages are within the supported
+ * device address space range.
+ */
+int rte_eal_hugepage_check_address_mask(uint64_t dma_mask);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
index 5b9132c..2cd046d 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -1037,6 +1037,33 @@ calc_num_pages_per_socket(uint64_t * memory,
 }
 
 /*
+ * Some devices have addressing limitations. A PMD will indirectly call this
+ * function raising an error if any hugepage is out of address range supported.
+ * As hugepages are ordered by physical address, there is nothing to do as
+ * any other hugepage available will be out of range as well.
+ */
+int
+rte_eal_hugepage_check_address_mask(uint64_t dma_mask)
+{
+	const struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
+	phys_addr_t physaddr;
+	int i =0;
+
+	while (i < RTE_MAX_MEMSEG && mcfg->memseg[i].len > 0) {
+		physaddr = mcfg->memseg[i].phys_addr + mcfg->memseg[i].len;
+		RTE_LOG(DEBUG, EAL, "Checking page with address %"PRIx64" and device"
+				" mask 0x%"PRIx64"\n", physaddr, dma_mask);
+		if (physaddr & ~dma_mask) {
+			RTE_LOG(ERR, EAL, "Allocated hugepages are out of device address"
+					" range.");
+			return -1;
+		}
+		i++;
+	}
+	return 0;
+}
+
+/*
  * Prepare physical memory mapping: fill configuration structure with
  * these infos, return 0 on success.
  *  1. map N huge pages in separate files in hugetlbfs
-- 
1.9.1