vppinfra: remove linux/syscall.h

For portabiliy reasons it is better to have all wrapped in clib code.
I.e. instead of using getcpu() we have clib_get_current_numa_node () and
clib_get_current_cpu_id().

Type: refactor
Change-Id: I29b52d7f29bc7f93873402c4070561f564b71c63
Signed-off-by: Damjan Marion <damarion@cisco.com>

13 files changed, 51 insertions, 163 deletions

diff --git a/src/cmake/syscall.cmake b/src/cmake/syscall.cmake
index aa3bac45372..6a4c75e21c5 100644
--- a/src/cmake/syscall.cmake
+++ b/src/cmake/syscall.cmake
@@ -11,29 +11,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-##############################################################################
-# Check for memfd_create headers and libs
-##############################################################################
-check_c_source_compiles("
-  #define _GNU_SOURCE
-  #include <sys/mman.h>
-  int main() { return memfd_create (\"/dev/false\", 0); }
-" HAVE_MEMFD_CREATE)
-
-if (HAVE_MEMFD_CREATE)
-    add_definitions(-DHAVE_MEMFD_CREATE)
-endif()
-
-check_c_source_compiles("
-  #define _GNU_SOURCE
-  #include <sched.h>
-  int main() { return getcpu (0, 0); }
-" HAVE_GETCPU)
-
-if (HAVE_GETCPU)
-    add_definitions(-DHAVE_GETCPU)
-endif()
-
 check_c_source_compiles("
   #define _GNU_SOURCE
   #include <fcntl.h>
diff --git a/src/plugins/memif/memif.c b/src/plugins/memif/memif.c
index 31a34cc18e6..bce17ef9a31 100644
--- a/src/plugins/memif/memif.c
+++ b/src/plugins/memif/memif.c
@@ -33,7 +33,6 @@
 
 #include <vlib/vlib.h>
 #include <vlib/unix/unix.h>
-#include <vppinfra/linux/syscall.h>
 #include <vnet/plugin/plugin.h>
 #include <vnet/ethernet/ethernet.h>
 #include <vnet/interface/rx_queue_funcs.h>
diff --git a/src/vlib/physmem.c b/src/vlib/physmem.c
index 846f9a091ae..a36444fdc9f 100644
--- a/src/vlib/physmem.c
+++ b/src/vlib/physmem.c
@@ -21,7 +21,6 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
-#include <vppinfra/linux/syscall.h>
 #include <vppinfra/linux/sysfs.h>
 #include <vlib/vlib.h>
 #include <vlib/physmem.h>
diff --git a/src/vpp/stats/stat_segment.c b/src/vpp/stats/stat_segment.c
index 5042ba842d9..ddf6e19b1a8 100644
--- a/src/vpp/stats/stat_segment.c
+++ b/src/vpp/stats/stat_segment.c
@@ -19,8 +19,6 @@
 #include "stat_segment.h"
 #include <vnet/vnet.h>
 #include <vnet/devices/devices.h>	/* vnet_get_aggregate_rx_packets */
-#undef HAVE_MEMFD_CREATE
-#include <vppinfra/linux/syscall.h>
 #include <vpp-api/client/stat_client.h>
 
 stat_segment_main_t stat_segment_main;
diff --git a/src/vppinfra/CMakeLists.txt b/src/vppinfra/CMakeLists.txt
index 3f6e9f591d9..8cebd32ffe3 100644
--- a/src/vppinfra/CMakeLists.txt
+++ b/src/vppinfra/CMakeLists.txt
@@ -192,7 +192,6 @@ set(VPPINFRA_HEADERS
   vector_sse42.h
   warnings.h
   xxhash.h
-  linux/syscall.h
   linux/sysfs.h
 )
 
diff --git a/src/vppinfra/bihash_template.c b/src/vppinfra/bihash_template.c
index 555c2e00cfb..0c6aa2a3e5e 100644
--- a/src/vppinfra/bihash_template.c
+++ b/src/vppinfra/bihash_template.c
@@ -272,7 +272,7 @@ void BV (clib_bihash_initiator_init_svm)
 
   ASSERT (memory_size < (1ULL << 32));
   /* Set up for memfd sharing */
-  if ((fd = memfd_create (name, MFD_ALLOW_SEALING)) == -1)
+  if ((fd = clib_mem_vm_create_fd (CLIB_MEM_PAGE_SZ_DEFAULT, name) == -1)
     {
       clib_unix_warning ("memfd_create");
       return;
diff --git a/src/vppinfra/bihash_template.h b/src/vppinfra/bihash_template.h
index 1ca0ae447f8..da2f684b685 100644
--- a/src/vppinfra/bihash_template.h
+++ b/src/vppinfra/bihash_template.h
@@ -34,7 +34,6 @@
 #endif
 
 #ifdef BIHASH_32_64_SVM
-#undef HAVE_MEMFD_CREATE
 #include <vppinfra/linux/syscall.h>
 #include <fcntl.h>
 #define F_LINUX_SPECIFIC_BASE 1024
diff --git a/src/vppinfra/cpu.c b/src/vppinfra/cpu.c
index 4631eb3b896..d2edc61cfbf 100644
--- a/src/vppinfra/cpu.c
+++ b/src/vppinfra/cpu.c
@@ -222,7 +222,21 @@ format_cpu_flags (u8 * s, va_list * args)
 #endif
 }
 
+__clib_export u32
+clib_get_current_cpu_id ()
+{
+  unsigned cpu, node;
+  syscall (__NR_getcpu, &cpu, &node, 0);
+  return cpu;
+}
 
+__clib_export u32
+clib_get_current_numa_node ()
+{
+  unsigned cpu, node;
+  syscall (__NR_getcpu, &cpu, &node, 0);
+  return node;
+}
 
 /*
  * fd.io coding-style-patch-verification: ON
diff --git a/src/vppinfra/cpu.h b/src/vppinfra/cpu.h
index bc4ee58b716..6925d584e52 100644
--- a/src/vppinfra/cpu.h
+++ b/src/vppinfra/cpu.h
@@ -167,21 +167,8 @@ _ (asimddp,    20) \
 _ (sha512,     21) \
 _ (sve,        22)
 
-static inline u32
-clib_get_current_cpu_id ()
-{
-  unsigned cpu, node;
-  syscall (__NR_getcpu, &cpu, &node, 0);
-  return cpu;
-}
-
-static inline u32
-clib_get_current_numa_node ()
-{
-  unsigned cpu, node;
-  syscall (__NR_getcpu, &cpu, &node, 0);
-  return node;
-}
+u32 clib_get_current_cpu_id ();
+u32 clib_get_current_numa_node ();
 
 #if defined(__x86_64__)
 #include "cpuid.h"
diff --git a/src/vppinfra/linux/mem.c b/src/vppinfra/linux/mem.c
index 11a1e9ee45a..cb46df82552 100644
--- a/src/vppinfra/linux/mem.c
+++ b/src/vppinfra/linux/mem.c
@@ -30,7 +30,6 @@
 #include <vppinfra/time.h>
 #include <vppinfra/format.h>
 #include <vppinfra/clib_error.h>
-#include <vppinfra/linux/syscall.h>
 #include <vppinfra/linux/sysfs.h>
 
 #ifndef F_LINUX_SPECIFIC_BASE
@@ -149,7 +148,7 @@ clib_mem_main_init ()
   mm->log2_page_sz = min_log2 (page_size);
 
   /* default system hugeppage size */
-  if ((fd = memfd_create ("test", MFD_HUGETLB)) != -1)
+  if ((fd = syscall (__NR_memfd_create, "test", MFD_HUGETLB)) != -1)
     {
       mm->log2_default_hugepage_sz = clib_mem_get_fd_log2_page_size (fd);
       close (fd);
@@ -169,7 +168,7 @@ clib_mem_main_init ()
   for (int i = 0; i < CLIB_MAX_NUMAS; i++)
     {
       int status;
-      if (move_pages (0, 1, &va, &i, &status, 0) == 0)
+      if (syscall (__NR_move_pages, 0, 1, &va, &i, &status, 0) == 0)
 	mm->numa_node_bitmap |= 1ULL << i;
     }
 
@@ -298,7 +297,7 @@ clib_mem_vm_create_fd (clib_mem_page_sz_t log2_page_size, char *fmt, ...)
   vec_add1 (s, 0);
 
   /* memfd_create introduced in kernel 3.17, we don't support older kernels */
-  fd = memfd_create ((char *) s, memfd_flags);
+  fd = syscall (__NR_memfd_create, (char *) s, memfd_flags);
 
   /* kernel versions < 4.14 does not support memfd_create for huge pages */
   if (fd == -1 && errno == EINVAL &&
@@ -568,7 +567,7 @@ clib_mem_get_page_stats (void *start, clib_mem_page_sz_t log2_page_size,
   stats->total = n_pages;
   stats->log2_page_sz = log2_page_size;
 
-  if (move_pages (0, n_pages, ptr, 0, status, 0) != 0)
+  if (syscall (__NR_move_pages, 0, n_pages, ptr, 0, status, 0) != 0)
     {
       stats->unknown = n_pages;
       goto done;
@@ -658,7 +657,8 @@ clib_mem_set_numa_affinity (u8 numa_node, int force)
 
   mask[0] = 1 << numa_node;
 
-  if (set_mempolicy (force ? MPOL_BIND : MPOL_PREFERRED, mask, mask_len))
+  if (syscall (__NR_set_mempolicy, force ? MPOL_BIND : MPOL_PREFERRED, mask,
+	       mask_len))
     goto error;
 
   vec_reset_length (mm->error);
@@ -675,7 +675,7 @@ clib_mem_set_default_numa_affinity ()
 {
   clib_mem_main_t *mm = &clib_mem_main;
 
-  if (set_mempolicy (MPOL_DEFAULT, 0, 0))
+  if (syscall (__NR_set_mempolicy, MPOL_DEFAULT, 0, 0))
     {
       vec_reset_length (mm->error);
       mm->error = clib_error_return_unix (mm->error, (char *) __func__);
diff --git a/src/vppinfra/linux/syscall.h b/src/vppinfra/linux/syscall.h
deleted file mode 100644
index c07cad631bd..00000000000
--- a/src/vppinfra/linux/syscall.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * Copyright (c) 2017 Cisco and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef included_linux_syscall_h
-#define included_linux_syscall_h
-
-#include <unistd.h>
-#include <sys/syscall.h>
-
-#ifndef HAVE_GETCPU
-static inline int
-getcpu (unsigned *cpu, unsigned *node)
-{
-  return syscall (__NR_getcpu, cpu, node, 0);
-}
-#endif
-
-static inline long
-set_mempolicy (int mode, const unsigned long *nodemask, unsigned long maxnode)
-{
-  return syscall (__NR_set_mempolicy, mode, nodemask, maxnode);
-}
-
-static inline int
-get_mempolicy (int *mode, unsigned long *nodemask, unsigned long maxnode,
-	       void *addr, unsigned long flags)
-{
-  return syscall (__NR_get_mempolicy, mode, nodemask, maxnode, addr, flags);
-}
-
-static inline long
-move_pages (int pid, unsigned long count, void **pages, const int *nodes,
-	    int *status, int flags)
-{
-  return syscall (__NR_move_pages, pid, count, pages, nodes, status, flags);
-}
-
-#ifndef HAVE_MEMFD_CREATE
-static inline int
-memfd_create (const char *name, unsigned int flags)
-{
-  return syscall (__NR_memfd_create, name, flags);
-}
-#endif
-
-#endif /* included_linux_syscall_h */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
diff --git a/src/vppinfra/pmalloc.c b/src/vppinfra/pmalloc.c
index 546a4fe336b..27738e15f47 100644
--- a/src/vppinfra/pmalloc.c
+++ b/src/vppinfra/pmalloc.c
@@ -19,16 +19,14 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
-#include <linux/mempolicy.h>
-#include <linux/memfd.h>
 #include <sched.h>
 
 #include <vppinfra/format.h>
-#include <vppinfra/linux/syscall.h>
 #include <vppinfra/linux/sysfs.h>
 #include <vppinfra/mem.h>
 #include <vppinfra/hash.h>
 #include <vppinfra/pmalloc.h>
+#include <vppinfra/cpu.h>
 
 #if __SIZEOF_POINTER__ >= 8
 #define DEFAULT_RESERVED_MB 16384
@@ -48,18 +46,6 @@ pmalloc_size2pages (uword size, u32 log2_page_sz)
   return round_pow2 (size, 1ULL << log2_page_sz) >> log2_page_sz;
 }
 
-static inline int
-pmalloc_validate_numa_node (u32 * numa_node)
-{
-  if (*numa_node == CLIB_PMALLOC_NUMA_LOCAL)
-    {
-      u32 cpu;
-      if (getcpu (&cpu, numa_node) != 0)
-	return 1;
-    }
-  return 0;
-}
-
 __clib_export int
 clib_pmalloc_init (clib_pmalloc_main_t * pm, uword base_addr, uword size)
 {
@@ -241,12 +227,10 @@ static inline clib_pmalloc_page_t *
 pmalloc_map_pages (clib_pmalloc_main_t * pm, clib_pmalloc_arena_t * a,
 		   u32 numa_node, u32 n_pages)
 {
+  clib_mem_page_stats_t stats = {};
   clib_pmalloc_page_t *pp = 0;
-  int status, rv, i, mmap_flags;
+  int rv, i, mmap_flags;
   void *va = MAP_FAILED;
-  int old_mpol = -1;
-  long unsigned int mask[16] = { 0 };
-  long unsigned int old_mask[16] = { 0 };
   uword size = (uword) n_pages << pm->def_log2_page_sz;
 
   clib_error_free (pm->error);
@@ -266,17 +250,8 @@ pmalloc_map_pages (clib_pmalloc_main_t * pm, clib_pmalloc_arena_t * a,
 	return 0;
     }
 
-  rv = get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1, 0, 0);
-  /* failure to get mempolicy means we can only proceed with numa 0 maps */
-  if (rv == -1 && numa_node != 0)
-    {
-      pm->error = clib_error_return_unix (0, "failed to get mempolicy");
-      return 0;
-    }
-
-  mask[0] = 1 << numa_node;
-  rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1);
-  if (rv == -1 && numa_node != 0)
+  rv = clib_mem_set_numa_affinity (numa_node, /* force */ 1);
+  if (rv == CLIB_MEM_ERROR && numa_node != 0)
     {
       pm->error = clib_error_return_unix (0, "failed to set mempolicy for "
 					  "numa node %u", numa_node);
@@ -323,8 +298,8 @@ pmalloc_map_pages (clib_pmalloc_main_t * pm, clib_pmalloc_arena_t * a,
 
   clib_memset (va, 0, size);
 
-  rv = set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1);
-  if (rv == -1 && numa_node != 0)
+  rv = clib_mem_set_default_numa_affinity ();
+  if (rv == CLIB_MEM_ERROR && numa_node != 0)
     {
       pm->error = clib_error_return_unix (0, "failed to restore mempolicy");
       goto error;
@@ -332,14 +307,23 @@ pmalloc_map_pages (clib_pmalloc_main_t * pm, clib_pmalloc_arena_t * a,
 
   /* we tolerate move_pages failure only if request os for numa node 0
      to support non-numa kernels */
-  rv = move_pages (0, 1, &va, 0, &status, 0);
-  if ((rv == 0 && status != numa_node) || (rv != 0 && numa_node != 0))
+  clib_mem_get_page_stats (va, CLIB_MEM_PAGE_SZ_DEFAULT, 1, &stats);
+
+  if (stats.per_numa[numa_node] != 1)
     {
-      pm->error = rv == -1 ?
-	clib_error_return_unix (0, "page allocated on wrong node, numa node "
-				"%u status %d", numa_node, status) :
-	clib_error_return (0, "page allocated on wrong node, numa node "
-			   "%u status %d", numa_node, status);
+      u16 allocated_at = ~0;
+      if (stats.unknown)
+	clib_error_return (0,
+			   "unable to get information about numa allocation");
+
+      for (u16 i = 0; i < CLIB_MAX_NUMAS; i++)
+	if (stats.per_numa[i] == 1)
+	  allocated_at = i;
+
+      clib_error_return (0,
+			 "page allocated on the wrong numa node (%u), "
+			 "expected %u",
+			 allocated_at, numa_node);
 
       goto error;
     }
@@ -407,8 +391,8 @@ clib_pmalloc_create_shared_arena (clib_pmalloc_main_t * pm, char *name,
   if (n_pages + vec_len (pm->pages) > pm->max_pages)
     return 0;
 
-  if (pmalloc_validate_numa_node (&numa_node))
-    return 0;
+  if (numa_node == CLIB_PMALLOC_NUMA_LOCAL)
+    numa_node = clib_get_current_numa_node ();
 
   pool_get (pm->arenas, a);
   a->index = a - pm->arenas;
@@ -438,8 +422,8 @@ clib_pmalloc_alloc_inline (clib_pmalloc_main_t * pm, clib_pmalloc_arena_t * a,
 
   ASSERT (is_pow2 (align));
 
-  if (pmalloc_validate_numa_node (&numa_node))
-    return 0;
+  if (numa_node == CLIB_PMALLOC_NUMA_LOCAL)
+    numa_node = clib_get_current_numa_node ();
 
   if (a == 0)
     {
diff --git a/src/vppinfra/unix-formats.c b/src/vppinfra/unix-formats.c
index af1eb1aaa7b..cd137e58687 100644
--- a/src/vppinfra/unix-formats.c
+++ b/src/vppinfra/unix-formats.c
@@ -63,8 +63,6 @@
 
 #include <vppinfra/time.h>
 #if __linux__
-#include <vppinfra/linux/syscall.h>
-
 #ifdef AF_NETLINK
 #include <linux/types.h>
 #include <linux/netlink.h>