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-rw-r--r--src/vlib/buffer_funcs.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/src/vlib/buffer_funcs.h b/src/vlib/buffer_funcs.h
index 1ea3c0829b8..06cc6dac61e 100644
--- a/src/vlib/buffer_funcs.h
+++ b/src/vlib/buffer_funcs.h
@@ -344,6 +344,35 @@ vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
}
+/** \brief Allocate buffers into ring
+
+ @param vm - (vlib_main_t *) vlib main data structure pointer
+ @param buffers - (u32 * ) buffer index ring
+ @param start - (u32) first slot in the ring
+ @param ring_size - (u32) ring size
+ @param n_buffers - (u32) number of buffers requested
+ @return - (u32) number of buffers actually allocated, may be
+ less than the number requested or zero
+*/
+always_inline u32
+vlib_buffer_alloc_to_ring (vlib_main_t * vm, u32 * ring, u32 start,
+ u32 ring_size, u32 n_buffers)
+{
+ u32 n_alloc;
+
+ ASSERT (n_buffers <= ring_size);
+
+ if (PREDICT_TRUE (start + n_buffers <= ring_size))
+ return vlib_buffer_alloc (vm, ring + start, n_buffers);
+
+ n_alloc = vlib_buffer_alloc (vm, ring + start, ring_size - start);
+
+ if (PREDICT_TRUE (n_alloc == ring_size - start))
+ n_alloc += vlib_buffer_alloc (vm, ring, n_buffers - n_alloc);
+
+ return n_alloc;
+}
+
/** \brief Free buffers
Frees the entire buffer chain for each buffer