Broadcom NetXtreme/NetLink BCM5718 Series

Table of ContentsBCM5718 Programmer’s Guide
Broadcom
®
January 29, 2016 • 5718-PG108-R Page 15
Send Buffer Descriptor........................................................................................................................ 112
Host Address................................................................................................................................ 112
Length[15:0] ................................................................................................................................. 112
VLAN Tag[15:0]............................................................................................................................ 112
HdrLen[7:0] .................................................................................................................................. 112
MSS[13:0] .................................................................................................................................... 113
Flags ............................................................................................................................................ 113
LSO Limitations ................................................................................................................................... 114
Additional LSO Notes .......................................................................................................................... 114
Example TCP-segmentation-related (LSO) register values ......................................................... 115
Jumbo Frames.......................................................................................................................................... 116
Affected Data Structures ..................................................................................................................... 117
Extended RX Buffer Descriptor (BD)............................................................................................ 117
Receive Jumbo Producer Ring .................................................................................................... 120
Ring Control Blocks...................................................................................................................... 121
Receive Return Ring(s)................................................................................................................ 122
Send Buffer Descriptor................................................................................................................. 122
Status Block ................................................................................................................................. 124
Misc BD Memory.......................................................................................................................... 125
Device Driver Interface........................................................................................................................ 125
Send Interface.............................................................................................................................. 125
Receive Interface ......................................................................................................................... 126
Large Segment Offload (LSO/TSO) ............................................................................................. 128
Summary of Register Settings to Support Jumbo Frames .................................................................. 129
Scatter/Gather........................................................................................................................................... 130
VLAN Tag Insertion.................................................................................................................................. 131
TX Data Flow Diagram.............................................................................................................................. 131
Reset.......................................................................................................................................................... 134
MAC Address Setup/Configuration ........................................................................................................ 135
Packet Filtering......................................................................................................................................... 135
Multicast Hash Table Setup/Configuration .......................................................................................... 135
Ethernet CRC Calculation ................................................................................................................... 136
Generating CRC.................................................................................................................................. 136
Checking CRC..................................................................................................................................... 136
Initializing the MAC Hash Registers .................................................................................................... 136
Promiscuous Mode Setup/Configuration............................................................................................. 138
Broadcast Setup/Configuration ........................................................................................................... 138
Section 7: Device Control............................................................................................... 139
Initialization Procedure............................................................................................................................ 139