Extending switch fabric processing to network interface cards
An example system comprises a plurality of servers comprising respective network interface cards (NICs) connected by physical links in a physical topology, wherein each NIC of the plurality of NICs comprises an embedded switch and a processing unit coupled to the embedded switch; and an edge services controller configured to program the processing unit of a network interface card of the plurality of network interface cards to: receive, at a first network interface of the NIC, a data packet from a physical device; based on the data packet being received at the first network interface, modify the data packet to generate a modified data packet; and output the modified data packet to the physical device via a second network interface of the NIC.
1 . A system comprising:
a plurality of servers comprising respective network interface cards (NICs) connected by physical links in a physical topology, wherein each NIC of the plurality of NICs comprises an embedded switch and a processing unit coupled to the embedded switch; and
an edge services controller configured to program the processing unit of a NIC of the plurality of NICs to:
receive, at a first network interface of the NIC coupled to a first physical link to a physical network device, a data packet from the physical network device;
based on the data packet being received at the first network interface, modify the data packet to generate a modified data packet according to a protocol not supported by the physical network device; and
output the modified data packet to the physical network device via a second network interface of the NIC, wherein the second network interface is coupled to a second physical link to the physical network device.
2 . The system of claim 1 , wherein the edge services controller is configured to program the processing unit of the NIC to, as part of modifying the data packet to generate the modified data packet, modify a segment routing header of the data packet to include a modified segment routing header.
3 . The system of claim 1 , wherein:
the protocol is a first protocol,
the processing unit of the NIC is programmed to, as part of modifying the data packet to generate the modified data packet, encapsulate the data packet for transmission according to the first protocol, or
the data packet is encapsulated for transmission according to the first protocol and the processing unit of the NIC is programmed to, as part of modifying the data packet to generate the modified data packet, decapsulate the data packet for transmission according to a second protocol.
4 . The system of claim 3 , wherein the physical network device is not equipped for decapsulating data packets encapsulated for transmission according to the first protocol.
5 . The system of claim 1 , wherein:
the data packet is a Segment Routing (SR) packet encapsulated according to a Compressed Routing Header (CRH) protocol, and
the processing unit of the NIC is programmed to, as part of modifying the data packet to generate the modified data packet, modify the data packet to be a SR packet with a destination IP address set to a new waypoint.
6 . The system of claim 1 ,
wherein the physical network device comprises at least one of a network switch, network router, firewall, load balancer, network address translation device, or physical network function.
7 . A network interface card comprising:
a first network interface coupled to a first physical link to a physical network device;
a second network interface coupled to a second physical link to the physical network device;
an embedded switch; and
a processing unit coupled to the embedded switch, wherein the processing unit is configured to:
receive, at the first network interface, a data packet from the physical network device;
based on the data packet being received at the first network interface, modify the data packet to generate a modified data packet according to a protocol not supported by the physical network device; and
output the modified data packet to the physical network device via the second network interface.
8 . The network interface card of claim 7 , wherein the processing unit is configured to, as part of modifying the data packet, modify a segment routing header of the data packet to generate the modified data packet with a modified segment routing header.
9 . The network interface card of claim 7 , wherein:
the protocol is a first protocol,
the processing unit is configured to, as part of modifying the data packet to generate the modified data packet, encapsulate the data packet for transmission according to the first protocol, or
the data packet is encapsulated for transmission according to the first protocol and the processing unit is programmed to, as part of modifying the data packet to generate the modified data packet, decapsulate the data packet for transmission according to a second protocol.
10 . The network interface card of claim 7 , wherein:
the data packet is a Segment Routing (SR) packet encapsulated according to a Compressed Routing Header (CRH) protocol; and
the processing unit is configured to, as part of modifying the data packet to generate the modified data packet, modify the data packet to be a SR packet with a destination IP address set to a new waypoint.
11 . The network interface card of claim 7 ,
wherein the physical network device comprises at least one of a network switch, network router, firewall, load balancer, network address translation device, or physical network function.
12 . A physical network device comprising:
a physical network interface; and
a first processing unit configured to:
receive a data packet;
apply a flow filter that performs a first lookup to determine whether to send the data packet to a network interface card (NIC) for processing, wherein the NIC has a second processing unit coupled to an embedded switch;
based on the flow filter causing a determination to send the data packet to the NIC for processing, encapsulate the data packet to generate an encapsulated data packet and send the encapsulated data packet to the NIC via a first network interface of the physical network device coupled to a first physical link to a first network interface of the NIC;
receive an encapsulated modified data packet from the NIC via a second network interface of the physical network device coupled to a second physical link to a second network interface of the NIC;
decapsulate the encapsulated modified data packet to obtain a modified data packet that was modified by the NIC according to a protocol not supported by the physical network device; and
forward the modified data packet via the physical network interface.
13 . The physical network device of claim 12 , wherein the modified data packet has a modified segment routing header.
14 . The physical network device of claim 12 , wherein the modified data packet is encapsulated for transmission according to the protocol.
15 . The physical network device of claim 12 , wherein the first processing unit is configured to encapsulate the data packet with an outer header for a tunnel, wherein the tunnel is an Internet Protocol (IP)-IP tunnel.
16 . The physical network device of claim 12 , wherein the first processing unit is configured to, as part of encapsulating the data packet, generate an outer header of the data packet, wherein the first processing unit marks the outer header of the data packet to indicate the data packet for modification by the NIC.
17 . The physical network device of claim 12 , wherein the physical network device is a Top of Rack switch configured to provide at least one of layer 2 or layer 3 routing and/or switching functionality.