Enabling Ddp; Connection Offload Policies (Cop) - Chelsio Communications Terminator series Installation And User Manual

Chapter II. Network (NIC-TOE)
T6 SO (Server Offload) adapters support limited number of offload connections. To see the
maximum number of offload connections, run the following command:
[root@host~]# sysctl dev.t6nex.X.misc.tids
Where,
TID is the number of offload connections.
STID is the number of offload servers.
3.3.

Enabling DDP

DDP is disabled by default. To enable it, run the sysctl command.
For T6 adapters:
[root@host~]# sysctl -w dev.t6nex.X.toe.ddp=1
For T5 and T4, use t5nex and t4nex respectively.
3.4.

Connection Offload Policies (COP)

Connection Offload Policies (COP) are policies applicable to offloaded connections that are
created through TOM driver. COP compiles offload policies into a simple program using BPF,
and that generated byte code can be loaded into the kernel and interpreted. These offload
policies are used to determine the settings to be used for various connections based on
matching filter specifications with program rules.
The following section explains the method to create and apply COP.
1. If not done already, load NIC and TOE drivers:
[root@host~]# kldload if_cxgbe
[root@host~]# kldload t4_tom
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