packet: doc: how to PACKET_MMAP with one packet socket for rx and tx

index 723bf3d..5566c20 100644
@@ -98,6 +98,11 @@ by the kernel.
 The destruction of the socket and all associated resources
 is done by a simple call to close(fd).
 
+As without PACKET_MMAP, it is possible to use one socket for
+capture and transmission. This can be done by mapping the
+allocated RX and TX buffer ring with a single mmap() call. See
+"Mapping and use of the circular buffer (ring)".
+
 Next I will describe PACKET_MMAP settings and its constraints,
 also the mapping of the circular buffer in the user process and
 the use of this buffer.

@@ -414,6 +419,19 @@ tp_block_size/tp_frame_size frames there will be a gap between
 the frames. This is because a frame cannot be spawn across two
 blocks.
 
+To use one socket for capture and transmission, the mapping of both the RX
+and TX buffer ring has to be done with one call to mmap:
+
+    ...
+    setsockopt(fd, SOL_PACKET, PACKET_RX_RING, &foo, sizeof(foo));
+    setsockopt(fd, SOL_PACKET, PACKET_TX_RING, &bar, sizeof(bar));
+    ...
+    rx_ring = mmap(0, size * 2, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+    tx_ring = rx_ring + size;
+
+RX must be the first as the kernel maps the TX ring memory right after
+the RX one.
+
 At the beginning of each frame there is an status field (see
 struct tpacket_hdr). If this field is 0 means that the frame is ready
 to be used for the kernel, If not, there is a frame the user can read