Improve MTU handling - vpp - Vector Packet Processing

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author	Neale Ranns <neale.ranns@cisco.com>	2018-02-09 06:05:16 -0800
committer	Damjan Marion <dmarion.lists@gmail.com>	2018-02-12 11:23:33 +0000
commit	ffd78d1ef8fe80d1b756a71d42d5eadda60ae996 (patch)
tree	99770e8773a7c3dd27c8b9b116edb6a39ace09ea /src/vnet/plugin
parent	2d6f66e1748be190664cbd72c826db32616d759a (diff)

Improve MTU handling

- setting MTU on an interface updates the L3 max bytes too - value cached in the adjacency is also updated - MTU exceeded generates ICMP to sender Change-Id: I343ec71d8e903b529594c4bd0543f04bc7f370b3 Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

Diffstat (limited to 'src/vnet/plugin')

0 files changed, 0 insertions, 0 deletions

/* *------------------------------------------------------------------ * svmtool.c * * Copyright (c) 2009 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. *------------------------------------------------------------------ */ #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/mman.h> #include <sys/stat.h> #include <netinet/in.h> #include <signal.h> #include <pthread.h> #include <unistd.h> #include <time.h> #include <fcntl.h> #include <string.h> #include <vppinfra/clib.h> #include <vppinfra/vec.h> #include <vppinfra/hash.h> #include <vppinfra/bitmap.h> #include <vppinfra/fifo.h> #include <vppinfra/time.h> #include <vppinfra/mheap.h> #include <vppinfra/heap.h> #include <vppinfra/pool.h> #include <vppinfra/format.h> #include "svm.h" /* * format_all_svm_regions * Maps / unmaps regions. Do NOT call from client code! */ u8 * format_all_svm_regions (u8 * s, va_list * args) { int verbose = va_arg (*args, int); svm_region_t *root_rp = svm_get_root_rp (); svm_main_region_t *mp; svm_subregion_t *subp; svm_region_t *rp; svm_map_region_args_t *a = 0; u8 **svm_names = 0; u8 *name = 0; int i; ASSERT (root_rp); pthread_mutex_lock (&root_rp->mutex); s = format (s, "%U", format_svm_region, root_rp, verbose); mp = root_rp->data_base; /* * Snapshoot names, can't hold root rp mutex across * find_or_create. */ /* *INDENT-OFF* */ pool_foreach (subp, mp->subregions, ({ name = vec_dup (subp->subregion_name); vec_add1(svm_names, name); })); /* *INDENT-ON* */ pthread_mutex_unlock (&root_rp->mutex); for (i = 0; i < vec_len (svm_names); i++) { vec_validate (a, 0); a->name = (char *) svm_names[i]; rp = svm_region_find_or_create (a); if (rp) { pthread_mutex_lock (&rp->mutex); s = format (s, "%U", format_svm_region, rp, verbose); pthread_mutex_unlock (&rp->mutex); svm_region_unmap (rp); vec_free (svm_names[i]); } vec_free (a); } vec_free (svm_names); return (s); } void show (char *chroot_path, int verbose) { svm_map_region_args_t *a = 0; vec_validate (a, 0); svm_region_init_chroot (chroot_path); fformat (stdout, "My pid is %d\n", getpid ()); fformat (stdout, "%U", format_all_svm_regions, verbose); svm_region_exit (); vec_free (a); } static void * svm_map_region_nolock (svm_map_region_args_t * a) { int svm_fd; svm_region_t *rp; int deadman = 0; u8 *shm_name; ASSERT ((a->size & ~(MMAP_PAGESIZE - 1)) == a->size); shm_name = shm_name_from_svm_map_region_args (a); svm_fd = shm_open ((char *) shm_name, O_RDWR, 0777); if (svm_fd < 0) { perror ("svm_region_map(mmap open)"); return (0); } vec_free (shm_name); rp = mmap (0, MMAP_PAGESIZE, PROT_READ | PROT_WRITE, MAP_SHARED, svm_fd, 0); if (rp == (svm_region_t *) MAP_FAILED) { close (svm_fd); clib_warning ("mmap"); return (0); } /* * We lost the footrace to create this region; make sure * the winner has crossed the finish line. */ while (rp->version == 0 && deadman++ < 5) { sleep (1); } /* * <bleep>-ed? */ if (rp->version == 0) { clib_warning ("rp->version %d not %d", rp->version, SVM_VERSION); munmap (rp, MMAP_PAGESIZE); return (0); } /* Remap now that the region has been placed */ a->baseva = rp->virtual_base; a->size = rp->virtual_size; munmap (rp, MMAP_PAGESIZE); rp = (void *) mmap ((void *) a->baseva, a->size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, svm_fd, 0); if ((uword) rp == (uword) MAP_FAILED) { clib_unix_warning ("mmap"); return (0); } if ((uword) rp != rp->virtual_base) { clib_warning ("mmap botch"); } if (pthread_mutex_trylock (&rp->mutex)) { clib_warning ("rp->mutex LOCKED by pid %d, tag %d, cleared...", rp->mutex_owner_pid, rp->mutex_owner_tag); memset (&rp->mutex, 0, sizeof (rp->mutex)); } else { clib_warning ("mutex OK...\n"); pthread_mutex_unlock (&rp->mutex); } return ((void *) rp); } /* * rnd_pagesize * Round to a pagesize multiple, presumably 4k works */ static u64 rnd_pagesize (u64 size) { u64 rv; rv = (size + (MMAP_PAGESIZE - 1)) & ~(MMAP_PAGESIZE - 1); return (rv); } #define MUTEX_DEBUG always_inline void region_lock (svm_region_t * rp, int tag) { pthread_mutex_lock (&rp->mutex); #ifdef MUTEX_DEBUG rp->mutex_owner_pid = getpid (); rp->mutex_owner_tag = tag; #endif } always_inline void region_unlock (svm_region_t * rp) { #ifdef MUTEX_DEBUG rp->mutex_owner_pid = 0; rp->mutex_owner_tag = 0; #endif pthread_mutex_unlock (&rp->mutex); } static void * svm_existing_region_map_nolock (void *root_arg, svm_map_region_args_t * a) { svm_region_t *root_rp = root_arg; svm_main_region_t *mp; svm_region_t *rp; void *oldheap; uword *p; a->size += MMAP_PAGESIZE + (a->pvt_heap_size ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE); a->size = rnd_pagesize (a->size); region_lock (root_rp, 4); oldheap = svm_push_pvt_heap (root_rp); mp = root_rp->data_base; ASSERT (mp); p = hash_get_mem (mp->name_hash, a->name); if (p) { rp = svm_map_region_nolock (a); region_unlock (root_rp); svm_pop_heap (oldheap); return rp; } return 0; } static void trace (char *chroot_path, char *name, int enable_disable) { svm_map_region_args_t *a = 0; svm_region_t *db_rp; void *oldheap; vec_validate (a, 0); svm_region_init_chroot (chroot_path); a->name = name; a->size = 1 << 20; a->flags = SVM_FLAGS_MHEAP; db_rp = svm_region_find_or_create (a); ASSERT (db_rp); region_lock (db_rp, 20); oldheap = svm_push_data_heap (db_rp); mheap_trace (db_rp->data_heap, enable_disable); svm_pop_heap (oldheap); region_unlock (db_rp); svm_region_unmap ((void *) db_rp); svm_region_exit (); vec_free (a); } static void subregion_repair (char *chroot_path) { int i; svm_main_region_t *mp; svm_map_region_args_t a; svm_region_t *root_rp; svm_region_t *rp; svm_subregion_t *subp; u8 *name = 0; u8 **svm_names = 0; svm_region_init_chroot (chroot_path); root_rp = svm_get_root_rp (); pthread_mutex_lock (&root_rp->mutex); mp = root_rp->data_base; /* * Snapshoot names, can't hold root rp mutex across * find_or_create. */ /* *INDENT-OFF* */ pool_foreach (subp, mp->subregions, ({ name = vec_dup (subp->subregion_name); vec_add1(svm_names, name); })); /* *INDENT-ON* */ pthread_mutex_unlock (&root_rp->mutex); for (i = 0; i < vec_len (svm_names); i++) { memset (&a, 0, sizeof (a)); a.root_path = chroot_path; a.name = (char *) svm_names[i]; fformat (stdout, "Checking %s region...\n", a.name); rp = svm_existing_region_map_nolock (root_rp, &a); if (rp) { svm_region_unmap (rp); vec_free (svm_names[i]); } } vec_free (svm_names); } void repair (char *chroot_path, int crash_root_region) { svm_region_t *root_rp = 0; svm_map_region_args_t *a = 0; void *svm_map_region (svm_map_region_args_t * a); int svm_fd; u8 *shm_name; fformat (stdout, "our pid: %d\n", getpid ()); vec_validate (a, 0); a->root_path = chroot_path; a->name = SVM_GLOBAL_REGION_NAME; a->baseva = SVM_GLOBAL_REGION_BASEVA; a->size = SVM_GLOBAL_REGION_SIZE; a->flags = SVM_FLAGS_NODATA; shm_name = shm_name_from_svm_map_region_args (a); svm_fd = shm_open ((char *) shm_name, O_RDWR, 0777); if (svm_fd < 0) { perror ("svm_region_map(mmap open)"); goto out; } vec_free (shm_name); root_rp = mmap (0, MMAP_PAGESIZE, PROT_READ | PROT_WRITE, MAP_SHARED, svm_fd, 0); if (root_rp == (svm_region_t *) MAP_FAILED) { close (svm_fd); clib_warning ("mmap"); goto out; } /* Remap now that the region has been placed */ clib_warning ("remap to 0x%x", root_rp->virtual_base); a->baseva = root_rp->virtual_base; a->size = root_rp->virtual_size; munmap (root_rp, MMAP_PAGESIZE); root_rp = (void *) mmap ((void *) a->baseva, a->size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, svm_fd, 0); if ((uword) root_rp == (uword) MAP_FAILED) { clib_unix_warning ("mmap"); goto out; } close (svm_fd); if ((uword) root_rp != root_rp->virtual_base) { clib_warning ("mmap botch"); goto out; } if (pthread_mutex_trylock (&root_rp->mutex)) { clib_warning ("root_rp->mutex LOCKED by pid %d, tag %d, cleared...", root_rp->mutex_owner_pid, root_rp->mutex_owner_tag); memset (&root_rp->mutex, 0, sizeof (root_rp->mutex)); goto out; } else { clib_warning ("root_rp->mutex OK...\n"); pthread_mutex_unlock (&root_rp->mutex); } out: vec_free (a); /* * Now that the root region is known to be OK, * fix broken subregions */ subregion_repair (chroot_path); if (crash_root_region) { clib_warning ("Leaving root region locked on purpose..."); pthread_mutex_lock (&root_rp->mutex); root_rp->mutex_owner_pid = getpid (); root_rp->mutex_owner_tag = 99; } svm_region_exit (); } int main (int argc, char **argv) { unformat_input_t input; int parsed = 0; char *name; char *chroot_path = 0; u8 *chroot_u8; unformat_init_command_line (&input, argv); while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT) { if (unformat (&input, "show-verbose")) { show (chroot_path, 1); parsed++; } else if (unformat (&input, "show")) { show (chroot_path, 0); parsed++; } else if (unformat (&input, "client-scan")) { svm_client_scan (chroot_path); parsed++; } else if (unformat (&input, "repair")) { repair (chroot_path, 0 /* fix it */ ); parsed++; } else if (unformat (&input, "crash")) { repair (chroot_path, 1 /* crash it */ ); parsed++; } else if (unformat (&input, "trace-on %s", &name)) { trace (chroot_path, name, 1); parsed++; } else if (unformat (&input, "trace-off %s", &name)) { trace (chroot_path, name, 0); parsed++; } else if (unformat (&input, "chroot %s", &chroot_u8)) { chroot_path = (char *) chroot_u8; } else { break; } } unformat_free (&input); if (!parsed) { fformat (stdout, "%s: show | show-verbose | client-scan | trace-on <region-name>\n", argv[0]); fformat (stdout, " trace-off <region-name>\n"); } exit (0); } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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