vfio: use contiguous mapping for IOVA as VA mode

[dpdk.git] / lib / librte_eal / linux / eal / eal_vfio.c

diff --git a/lib/librte_eal/linux/eal/eal_vfio.c b/lib/librte_eal/linux/eal/eal_vfio.c
index ed04231..501c74f 100644 (file)
--- a/lib/librte_eal/linux/eal/eal_vfio.c
+++ b/lib/librte_eal/linux/eal/eal_vfio.c
@@ -1231,6 +1231,19 @@ rte_vfio_get_group_num(const char *sysfs_base,
        return 1;
 }
 
+static int
+type1_map_contig(const struct rte_memseg_list *msl, const struct rte_memseg *ms,
+               size_t len, void *arg)
+{
+       int *vfio_container_fd = arg;
+
+       if (msl->external)
+               return 0;
+
+       return vfio_type1_dma_mem_map(*vfio_container_fd, ms->addr_64, ms->iova,
+                       len, 1);
+}
+
 static int
 type1_map(const struct rte_memseg_list *msl, const struct rte_memseg *ms,
                void *arg)
@@ -1300,6 +1313,13 @@ vfio_type1_dma_mem_map(int vfio_container_fd, uint64_t vaddr, uint64_t iova,
 static int
 vfio_type1_dma_map(int vfio_container_fd)
 {
+       if (rte_eal_iova_mode() == RTE_IOVA_VA) {
+               /* with IOVA as VA mode, we can get away with mapping contiguous
+                * chunks rather than going page-by-page.
+                */
+               return rte_memseg_contig_walk(type1_map_contig,
+                               &vfio_container_fd);
+       }
        return rte_memseg_walk(type1_map, &vfio_container_fd);
 }