New upstream version 17.11.4

[deb_dpdk.git] / lib / librte_eal / common / eal_common_memory.c

diff --git a/lib/librte_eal/common/eal_common_memory.c b/lib/librte_eal/common/eal_common_memory.c
index fc6c44d..a0922f1 100644 (file)
--- a/lib/librte_eal/common/eal_common_memory.c
+++ b/lib/librte_eal/common/eal_common_memory.c
@@ -109,6 +109,49 @@ rte_dump_physmem_layout(FILE *f)
        }
 }
 
+/* 63 bits is good enough for a sanity check */
+#define MAX_DMA_MASK_BITS 63
+
+/* check memseg iovas are within the required range based on dma mask */
+int
+rte_eal_check_dma_mask(uint8_t maskbits)
+{
+
+       const struct rte_mem_config *mcfg;
+       uint64_t mask;
+       int i;
+
+       /* sanity check */
+       if (maskbits > MAX_DMA_MASK_BITS) {
+               RTE_LOG(INFO, EAL, "wrong dma mask size %u (Max: %u)\n",
+                                  maskbits, MAX_DMA_MASK_BITS);
+               return -1;
+       }
+
+       /* create dma mask */
+       mask = ~((1ULL << maskbits) - 1);
+
+       /* get pointer to global configuration */
+       mcfg = rte_eal_get_configuration()->mem_config;
+
+       for (i = 0; i < RTE_MAX_MEMSEG; i++) {
+               if (mcfg->memseg[i].addr == NULL)
+                       break;
+
+               if (mcfg->memseg[i].iova & mask) {
+                       RTE_LOG(INFO, EAL,
+                               "memseg[%d] iova %"PRIx64" out of range:\n",
+                               i, mcfg->memseg[i].iova);
+
+                       RTE_LOG(INFO, EAL, "\tusing dma mask %"PRIx64"\n",
+                               mask);
+                       return -1;
+               }
+       }
+
+       return 0;
+}
+
 /* return the number of memory channels */
 unsigned rte_memory_get_nchannel(void)
 {