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authorFlorin Coras <fcoras@cisco.com>2018-01-16 02:40:18 -0800
committerDave Barach <openvpp@barachs.net>2018-01-17 19:11:14 +0000
commitd3e83a9c82b4a57c24061828db6a309692f7f2d4 (patch)
treecf774d9a360267686929dd0956a38de001acd9ff /src/vppinfra/linux
parent919f377efefb9c97a5206923f41651da559ad3fa (diff)
ssvm: reuse clib mem infra for memfd segments
Change-Id: I67648dbed3c7ed291b3e1ce617d83a776d3623bb Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vppinfra/linux')
-rw-r--r--src/vppinfra/linux/mem.c57
1 files changed, 51 insertions, 6 deletions
diff --git a/src/vppinfra/linux/mem.c b/src/vppinfra/linux/mem.c
index e0e22b0a775..3c449226273 100644
--- a/src/vppinfra/linux/mem.c
+++ b/src/vppinfra/linux/mem.c
@@ -26,6 +26,7 @@
#include <vppinfra/clib.h>
#include <vppinfra/mem.h>
+#include <vppinfra/time.h>
#include <vppinfra/format.h>
#include <vppinfra/clib_error.h>
#include <vppinfra/linux/syscall.h>
@@ -45,13 +46,34 @@
#define F_SEAL_WRITE 0x0008 /* prevent writes */
#endif
-int
-clib_mem_vm_get_log2_page_size (int fd)
+uword
+clib_mem_vm_get_page_size (int fd)
{
struct stat st = { 0 };
if (fstat (fd, &st) == -1)
return 0;
- return min_log2 (st.st_blksize);
+ return st.st_blksize;
+}
+
+int
+clib_mem_vm_get_log2_page_size (int fd)
+{
+ return min_log2 (clib_mem_vm_get_page_size (fd));
+}
+
+static void
+clib_mem_vm_randomize_va (uword * requested_va, u32 log2_page_size)
+{
+ u8 bit_mask = 15;
+
+ if (log2_page_size <= 12)
+ bit_mask = 15;
+ else if (log2_page_size > 12 && log2_page_size <= 16)
+ bit_mask = 3;
+ else
+ bit_mask = 0;
+
+ *requested_va += (clib_cpu_time_now () & bit_mask) * (1 << log2_page_size);
}
clib_error_t *
@@ -131,13 +153,19 @@ clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a)
goto error;
}
}
- log2_page_size = clib_mem_vm_get_log2_page_size (fd);
+ log2_page_size = clib_mem_vm_get_log2_page_size (fd);
if (log2_page_size == 0)
{
err = clib_error_return_unix (0, "cannot determine page size");
goto error;
}
+
+ if (a->requested_va)
+ {
+ clib_mem_vm_randomize_va (&a->requested_va, log2_page_size);
+ mmap_flags |= MAP_FIXED;
+ }
}
else /* not CLIB_MEM_VM_F_SHARED */
{
@@ -155,7 +183,6 @@ clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a)
n_pages = ((a->size - 1) >> log2_page_size) + 1;
-
if (a->flags & CLIB_MEM_VM_F_HUGETLB_PREALLOC)
{
err = clib_sysfs_prealloc_hugepages (a->numa_node,
@@ -186,7 +213,8 @@ clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a)
}
}
- addr = mmap (0, a->size, (PROT_READ | PROT_WRITE), mmap_flags, fd, 0);
+ addr = mmap (uword_to_pointer (a->requested_va, void *), a->size,
+ (PROT_READ | PROT_WRITE), mmap_flags, fd, 0);
if (addr == MAP_FAILED)
{
err = clib_error_return_unix (0, "mmap");
@@ -255,7 +283,24 @@ done:
return r;
}
+clib_error_t *
+clib_mem_vm_ext_map (clib_mem_vm_map_t * a)
+{
+ int mmap_flags = MAP_SHARED;
+ void *addr;
+ if (a->requested_va)
+ mmap_flags |= MAP_FIXED;
+
+ addr = (void *) mmap (uword_to_pointer (a->requested_va, void *), a->size,
+ PROT_READ | PROT_WRITE, mmap_flags, a->fd, 0);
+
+ if (addr == MAP_FAILED)
+ return clib_error_return_unix (0, "mmap");
+
+ a->addr = addr;
+ return 0;
+}
/*
* fd.io coding-style-patch-verification: ON