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authorDave Barach <dave@barachs.net>2020-04-09 17:24:07 -0400
committerFlorin Coras <florin.coras@gmail.com>2020-04-13 15:54:31 +0000
commitc74b43c80789f5e437dfe4cc491157b45a7f222e (patch)
tree0d149b8147d8225b5a872e709c6845476575fd1f /src/vlib/buffer_funcs.h
parentc54162981cdd41d65ed283df36955007552ddffe (diff)
buffers: configurable buffer fault injector
When configured at compile time via the cmake VPP_BUFFER_FAULT_INJECTOR option, the buffer allocator will appear to fail a certain fraction of the time. By default, the allocator succeeds 80% of the time. Detailed command line configuration options are available, but only when the image has been compiled with cmake option described above: vlib { buffer-alloc-success-rate [0.0 ... 1.0] buffer-alloc-success-seed <nnnn> } Modify vlib_buffer_pool_create(...) so 0 is always an invalid buffer index. Debug images: add checks for bad buffer index enqueues, and also verify that f->n_vectors doesn't accidentally map one or more instances of the frame poison pattern 0xfefefefe. Type: improvement Signed-off-by: Dave Barach <dave@barachs.net> Change-Id: Iab939858014463d1e664682805013d334d6fcbe5
Diffstat (limited to 'src/vlib/buffer_funcs.h')
-rw-r--r--src/vlib/buffer_funcs.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/vlib/buffer_funcs.h b/src/vlib/buffer_funcs.h
index 98ee2055833..b2076e60de4 100644
--- a/src/vlib/buffer_funcs.h
+++ b/src/vlib/buffer_funcs.h
@@ -571,6 +571,17 @@ vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
vlib_buffer_pool_thread_t *bpt;
u32 *src, *dst, len, n_left;
+ /* If buffer allocation fault injection is configured */
+ if (VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0)
+ {
+ u32 vlib_buffer_alloc_may_fail (vlib_main_t *, u32);
+
+ /* See how many buffers we're willing to allocate */
+ n_buffers = vlib_buffer_alloc_may_fail (vm, n_buffers);
+ if (n_buffers == 0)
+ return (n_buffers);
+ }
+
bp = vec_elt_at_index (bm->buffer_pools, buffer_pool_index);
bpt = vec_elt_at_index (bp->threads, vm->thread_index);