Documentation/infiniband/opa_vnic.rst

2 Intel Omni-Path (OPA) Virtual Network Interface Controller (VNIC)
5 Intel Omni-Path (OPA) Virtual Network Interface Controller (VNIC) feature
6 supports Ethernet functionality over Omni-Path fabric by encapsulating
11 The patterns of exchanges of Omni-Path encapsulated Ethernet packets
12 involves one or more virtual Ethernet switches overlaid on the Omni-Path
13 fabric topology. A subset of HFI nodes on the Omni-Path fabric are
26                                +-------------------+
30                                +-------------------+
35   +-----------------------------+  +------------------------------+
37   |  +---------+    +---------+ |  | +---------+    +---------+   |
39   +--+---------+----+---------+-+  +-+---------+----+---------+---+
45        +-----------+------------+  +-----------+------------+
47        +-----------+------------+  +-----------+------------+
49        +------------------------+  +------------------------+
52 The Omni-Path encapsulated Ethernet packet format is as described below.
58 0-19                 SLID (lower 20 bits)
59 20-30                Length (in Quad Words)
61 32-51                DLID (lower 20 bits)
62 52-56                SC (Service Class)
63 57-59                RC (Routing Control)
65 61-62                L2 (=10, 16B format)
69 0-7                  L4 type (=0x78 ETHERNET)
70 8-11                 SLID[23:20]
71 12-15                DLID[23:20]
72 16-31                PKEY
73 32-47                Entropy
74 48-63                Reserved
77 0-15                 Reserved
78 16-31                L4 header
79 32-63                Ethernet Packet
81 Quad Words 3 to N-1:
82 0-63                 Ethernet packet (pad extended)
85 0-23                 Ethernet packet (pad extended)
86 24-55                ICRC
87 56-61                Tail
88 62-63                LT (=01, Link Transfer Tail Flit)
98 belongs to. On the receive side, this field is used to de-multiplex the
104 OPA VNIC functionality has a HW dependent component and a HW
112 The HW dependent VNIC functionality is part of the HFI1 driver. It
116 net_device_ops functions. It expects Omni-Path encapsulated Ethernet
118 the Omni-Path header from the received packets before passing them up
127 set by HW dependent VNIC driver where required to accommodate any control
129 Omni-Path header in the transmit path. For each VNIC interface, the
131 interface. It also passes any control information to the HW dependent driver
134         +-------------------+ +----------------------+
138         +-------------------+ +----------------------+
141         +----------------------------+      |
147         +----------------------------+      |
150            +------------------+             |
152            +------------------+             |
155         +--------------------------------------------+
159         +--------------------------------------------+