Changes between Version 17 and Version 18 of 802.11/PacketFlow

Timestamp:

Oct 30, 2014, 9:01:31 AM (10 years ago)

Author:

welsh

Comment:

--

802.11/PacketFlow

@@ -55 +55 @@
 }}}
 
-The {{{PHY_RX_PKT_BUF_PHY_HDR_OFFSET}}} constat is defined as {{{PHY_TX_PKT_BUF_PHY_HDR_SIZE + PHY_RX_PKT_BUF_PHY_HDR_OFFSET}}}, where {{{PHY_RX_PKT_BUF_PHY_HDR_SIZE}}} is 8 (for the PHY header) and {{{PHY_TX_PKT_BUF_PHY_HDR_SIZE}}} is {{{sizeof(rx_frame_info)}}}.
+The {{{PHY_RX_PKT_BUF_PHY_HDR_OFFSET}}} constant is defined as {{{sizeof(rx_frame_info)}}}.  Similarly, 
+{{{PHY_TX_PKT_BUF_PHY_HDR_OFFSET}}} is defined as {{{sizeof(tx_frame_info)}}}.  
 
-Similarly {{{PHY_TX_PKT_BUF_PHY_HDR_OFFSET}}} is defined as {{{PHY_TX_PKT_BUF_PHY_HDR_SIZE + PHY_TX_PKT_BUF_PHY_HDR_OFFSET}}}.
+When using the packet buffers in CPU High, it is also necessary to know where the MPDU starts.  In order to determine where the MPDU starts within the packet buffer, the constants {{{PHY_RX_PKT_BUF_MPDU_OFFSET}}} and {{{PHY_TX_PKT_BUF_MPDU_OFFSET}}} must be used.  These include the PHY_HDR_OFFSET plus the PHY_HDR_SIZE (which is 8 for both the TX and RX PHY). 
 
 The Tx and Rx packet buffer contents for the reference design are described below.