mem: allow querying offset into segment fd

[dpdk.git] / lib / librte_eal / linuxapp / eal / eal_memalloc.c

diff --git a/lib/librte_eal/linuxapp/eal/eal_memalloc.c b/lib/librte_eal/linuxapp/eal/eal_memalloc.c
index 21f8427..6fc9dc0 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_memalloc.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memalloc.c
@@ -1406,6 +1406,30 @@ eal_memalloc_get_seg_fd(int list_idx, int seg_idx)
        return fd;
 }
 
+int
+eal_memalloc_get_seg_fd_offset(int list_idx, int seg_idx, size_t *offset)
+{
+       struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
+
+       /* fd_list not initialized? */
+       if (fd_list[list_idx].len == 0)
+               return -ENODEV;
+       if (internal_config.single_file_segments) {
+               size_t pgsz = mcfg->memsegs[list_idx].page_sz;
+
+               /* segment not active? */
+               if (fd_list[list_idx].memseg_list_fd < 0)
+                       return -ENOENT;
+               *offset = pgsz * seg_idx;
+       } else {
+               /* segment not active? */
+               if (fd_list[list_idx].fds[seg_idx] < 0)
+                       return -ENOENT;
+               *offset = 0;
+       }
+       return 0;
+}
+
 int
 eal_memalloc_init(void)
 {