vppinfra: refactor mpcap.h

vppinfra source files MUST NOT #include <vlib/vlib.h>, <vnet/vnet.h>
or similar. Move mpcap_add_packet(...), mpcap_add_buffer(...) to a new
file: src/vnet/mpcap.h.

Type: refactor
Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: Id517aef6fe49b618f853ce32940b91ba45a1e60d
(cherry picked from commit 2a41919e39d4672f76a654f30be9c2093cef4fad)

1 files changed, 113 insertions, 0 deletions

diff --git a/src/vnet/mpcap.h b/src/vnet/mpcap.h
new file mode 100644
index 00000000000..1c60454c198
--- /dev/null
+++ b/src/vnet/mpcap.h
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2020 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.
+ */
+
+#ifndef included_vnet_mpcap_h
+#define included_vnet_mpcap_h
+
+#include <vnet/vnet.h>
+#include <vppinfra/mpcap.h>
+
+/**
+ * @brief Add packet
+ *
+ * @param *pm - mpcap_main_t
+ * @param time_now - f64
+ * @param n_bytes_in_trace - u32
+ * @param n_bytes_in_packet - u32
+ *
+ * @return Packet Data
+ *
+ */
+static inline void *
+mpcap_add_packet (mpcap_main_t * pm,
+		  f64 time_now, u32 n_bytes_in_trace, u32 n_bytes_in_packet)
+{
+  mpcap_packet_header_t *h;
+  u8 *d;
+
+  /* File already closed? */
+  if (PREDICT_FALSE (pm->flags & MPCAP_FLAG_INIT_DONE) == 0)
+    return 0;
+
+  d = pm->current_va;
+  pm->current_va += sizeof (h[0]) + n_bytes_in_trace;
+
+  /* Out of space? */
+  if (PREDICT_FALSE (pm->current_va >= pm->file_baseva + pm->max_file_size))
+    return 0;
+  h = (void *) (d);
+  h->time_in_sec = time_now;
+  h->time_in_usec = 1e6 * (time_now - h->time_in_sec);
+  h->n_packet_bytes_stored_in_file = n_bytes_in_trace;
+  h->n_bytes_in_packet = n_bytes_in_packet;
+  pm->n_packets_captured++;
+  return h->data;
+}
+
+/**
+ * @brief Add buffer (vlib_buffer_t) to the trace
+ *
+ * @param *pm - mpcap_main_t
+ * @param *vm - vlib_main_t
+ * @param time_now - f64
+ * @param buffer_index - u32
+ * @param n_bytes_in_trace - u32
+ *
+ */
+static inline void
+mpcap_add_buffer (mpcap_main_t * pm,
+		  vlib_main_t * vm,
+		  f64 time_now, u32 buffer_index, u32 n_bytes_in_trace)
+{
+  vlib_buffer_t *b = vlib_get_buffer (vm, buffer_index);
+  u32 n = vlib_buffer_length_in_chain (vm, b);
+  i32 n_left = clib_min (n_bytes_in_trace, n);
+  void *d;
+
+  clib_spinlock_lock_if_init (&pm->lock);
+
+  d = mpcap_add_packet (pm, time_now, n_left, n);
+  if (PREDICT_FALSE (d == 0))
+    {
+      mpcap_close (pm);
+      clib_spinlock_unlock_if_init (&pm->lock);
+      return;
+    }
+
+  while (1)
+    {
+      u32 copy_length = clib_min ((u32) n_left, b->current_length);
+      clib_memcpy (d, b->data + b->current_data, copy_length);
+      n_left -= b->current_length;
+      if (n_left <= 0)
+	break;
+      d += b->current_length;
+      ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
+      b = vlib_get_buffer (vm, b->next_buffer);
+    }
+  if (pm->n_packets_captured >= pm->n_packets_to_capture)
+    mpcap_close (pm);
+
+  clib_spinlock_unlock_if_init (&pm->lock);
+}
+#endif /* included_vnet_mpcap_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */