vpp - Vector Packet Processing

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Diffstat (limited to 'doxygen/filter_api.py')

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/* * 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. */ #define _GNU_SOURCE #include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <sys/mount.h> #include <sys/mman.h> #include <fcntl.h> #include <linux/mempolicy.h> #include <linux/memfd.h> #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> #include <vppinfra/linux/sysfs.h> #ifndef F_LINUX_SPECIFIC_BASE #define F_LINUX_SPECIFIC_BASE 1024 #endif #ifndef F_ADD_SEALS #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9) #define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10) #define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */ #define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */ #define F_SEAL_GROW 0x0004 /* prevent file from growing */ #define F_SEAL_WRITE 0x0008 /* prevent writes */ #endif uword clib_mem_vm_get_page_size (int fd) { struct stat st = { 0 }; if (fstat (fd, &st) == -1) return 0; return st.st_blksize; } int clib_mem_vm_get_log2_page_size (int fd) { return min_log2 (clib_mem_vm_get_page_size (fd)); } 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 * clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a) { int fd = -1; clib_error_t *err = 0; void *addr = 0; u8 *filename = 0; int mmap_flags = MAP_SHARED; int log2_page_size; int n_pages; int old_mpol = -1; u64 old_mask[16] = { 0 }; /* save old numa mem policy if needed */ if (a->flags & (CLIB_MEM_VM_F_NUMA_PREFER | CLIB_MEM_VM_F_NUMA_FORCE)) { int rv; rv = get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1, 0, 0); if (rv == -1) { if (a->numa_node != 0 && (a->flags & CLIB_MEM_VM_F_NUMA_FORCE) != 0) { err = clib_error_return_unix (0, "get_mempolicy"); goto error; } else old_mpol = -1; } } /* if we are creating shared segment, we need file descriptor */ if (a->flags & CLIB_MEM_VM_F_SHARED) { /* if hugepages are needed we need to create mount point */ if (a->flags & CLIB_MEM_VM_F_HUGETLB) { char *mount_dir; char template[] = "/tmp/hugepage_mount.XXXXXX"; mount_dir = mkdtemp (template); if (mount_dir == 0) return clib_error_return_unix (0, "mkdtemp \'%s\'", template); if (mount ("none", (char *) mount_dir, "hugetlbfs", 0, NULL)) { err = clib_error_return_unix (0, "mount hugetlb directory '%s'", mount_dir); goto error; } filename = format (0, "%s/%s%c", mount_dir, a->name, 0); if ((fd = open ((char *) filename, O_CREAT | O_RDWR, 0755)) == -1) { err = clib_error_return_unix (0, "open"); goto error; } umount2 ((char *) mount_dir, MNT_DETACH); rmdir ((char *) mount_dir); mmap_flags |= MAP_LOCKED; } else { if ((fd = memfd_create (a->name, MFD_ALLOW_SEALING)) == -1) { err = clib_error_return_unix (0, "memfd_create"); goto error; } if ((fcntl (fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1) { err = clib_error_return_unix (0, "fcntl (F_ADD_SEALS)"); goto error; } } 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 */ { if (a->flags & CLIB_MEM_VM_F_HUGETLB) { mmap_flags |= MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS; log2_page_size = 21; } else { mmap_flags |= MAP_PRIVATE | MAP_ANONYMOUS; log2_page_size = min_log2 (sysconf (_SC_PAGESIZE)); } } 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, 1 << (log2_page_size - 10), n_pages); if (err) goto error; } if (fd != -1) if ((ftruncate (fd, a->size)) == -1) { err = clib_error_return_unix (0, "ftruncate"); goto error; } if (old_mpol != -1) { int rv; u64 mask[16] = { 0 }; mask[0] = 1 << a->numa_node; rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1); if (rv) { err = clib_error_return_unix (0, "set_mempolicy"); goto error; } } 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"); goto error; } /* re-apply old numa memory policy */ if (old_mpol != -1 && set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1) == -1) { err = clib_error_return_unix (0, "set_mempolicy"); goto error; } a->log2_page_size = log2_page_size; a->n_pages = n_pages; a->addr = addr; a->fd = fd; goto done; error: if (fd != -1) close (fd); done: vec_free (filename); return err; } u64 * clib_mem_vm_get_paddr (void *mem, int log2_page_size, int n_pages) { int pagesize = sysconf (_SC_PAGESIZE); int fd; int i; u64 *r = 0; if ((fd = open ((char *) "/proc/self/pagemap", O_RDONLY)) == -1) return 0; for (i = 0; i < n_pages; i++) { u64 seek, pagemap = 0; uword vaddr = pointer_to_uword (mem) + (((u64) i) << log2_page_size); seek = ((u64) vaddr / pagesize) * sizeof (u64); if (lseek (fd, seek, SEEK_SET) != seek) goto done; if (read (fd, &pagemap, sizeof (pagemap)) != (sizeof (pagemap))) goto done; if ((pagemap & (1ULL << 63)) == 0) goto done; pagemap &= pow2_mask (55); vec_add1 (r, pagemap * pagesize); } done: close (fd); if (vec_len (r) != n_pages) { vec_free (r); return 0; } 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 * * Local Variables: * eval: (c-set-style "gnu") * End: */


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