[dpdk-dev] [PATCH v2 6/7] eal/mem: use DMA mask check for legacy memory

[Alejandro Lucero]

If a device reports addressing limitations through a dma mask,
the IOVAs for mapped memory needs to be checked out for ensuring
correct functionality.

Previous patches introduced this DMA check for main memory code
currently being used but other options like legacy memory and the
no hugepages option need to be also considered.

This patch adds the DMA check for those cases.

Signed-off-by: Alejandro Lucero <alejandro.luc...@netronome.com>
---
 lib/librte_eal/linuxapp/eal/eal_memory.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c 
b/lib/librte_eal/linuxapp/eal/eal_memory.c
index fce86fda6..c7935879a 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -1393,6 +1393,18 @@ eal_legacy_hugepage_init(void)
 
                        addr = RTE_PTR_ADD(addr, (size_t)page_sz);
                }
+               if (mcfg->dma_maskbits &&
+                   rte_mem_check_dma_mask(mcfg->dma_maskbits)) {
+                       RTE_LOG(ERR, EAL,
+                               "%s(): couldnt allocate memory due to IOVA 
exceeding limits of current DMA mask.\n",
+                               __func__);
+                       if (rte_eal_iova_mode() == RTE_IOVA_VA &&
+                           rte_eal_using_phys_addrs())
+                               RTE_LOG(ERR, EAL,
+                                       "%s(): Please try initializing EAL with 
--iova-mode=pa parameter.\n",
+                                       __func__);
+                       goto fail;
+               }
                return 0;
        }
 
@@ -1628,6 +1640,14 @@ eal_legacy_hugepage_init(void)
                rte_fbarray_destroy(&msl->memseg_arr);
        }
 
+       if (mcfg->dma_maskbits &&
+           rte_mem_check_dma_mask(mcfg->dma_maskbits)) {
+               RTE_LOG(ERR, EAL,
+                       "%s(): couldn't allocate memory due to IOVA exceeding 
limits of current DMA mask.\n",
+                       __func__);
+               goto fail;
+       }
+
        return 0;
 
 fail:
-- 
2.17.1