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-rw-r--r--src/plugins/crypto_sw_scheduler/main.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/src/plugins/crypto_sw_scheduler/main.c b/src/plugins/crypto_sw_scheduler/main.c
index 29f91b36345..fa2611f065c 100644
--- a/src/plugins/crypto_sw_scheduler/main.c
+++ b/src/plugins/crypto_sw_scheduler/main.c
@@ -170,7 +170,21 @@ cryptodev_sw_scheduler_sgl (vlib_main_t * vm,
break;
}
- ASSERT (offset == 0 && len == 0);
+ ASSERT (offset == 0);
+ if (n_chunks && len)
+ {
+ /* Some async crypto users can use buffers in creative ways, let's allow
+ * some flexibility here...
+ * Current example is ESP decrypt with ESN in async mode: it will stash
+ * ESN at the end of the last buffer (if it can) because it must be part
+ * of the integrity check but it will not update the buffer length.
+ * Fixup the last operation chunk length if we have room.
+ */
+ ASSERT (vlib_buffer_space_left_at_end (vm, nb) >= len);
+ if (vlib_buffer_space_left_at_end (vm, nb) >= len)
+ ch->len += len;
+ }
+
op->chunk_index = chunk_index;
op->n_chunks = n_chunks;
}