Chelsio Communications Chelsio T5 Guida Utente Scaricare il pdf (Pagina 177)

Chapter XI. UDP Segmentation Offload and Pacing

Chelsio T5/T4 Unified Wire For Linux Page 177

4. Software/Driver Configuration and Fine-tuning

4.1. Modifying the application

To use the UDP offload functionality, the application needs to be modified. Follow the steps

mentioned below:

i. Determine the UDP socket file descriptor in the application through which data is sent

ii. Declare and initialize two variables in the application:

int fs=1316;

int cl=1;

Here,

 fs is the UDP packet payload size in bytes that is transmitted on the wire. The minimum

value of fs is 256 bytes.

 cl is the UDP traffic class(scheduler-class-index) that the user wishes to assign the data

stream to. This value needs to be in the range of 0 to 14.

The application will function according to the parameters set for that traffic class.

iii. Add socket option definitions:

In order to use setsockopt() to set the options to the UDP socket, the following three definitions

need to be made:

 SO_FRAMESIZE used for setting frame size, which has the value 291.

 SOL_SCHEDCLASS used for setting UDP traffic class, which has the value 290.

 IPPROTO_UDP used for setting the type of IP Protocol.

# define SO_FRAMESIZE 291

# define SOL_SCHEDCLASS 290

# define IPPROTO_UDP 17

iv. Use the setsockopt() function to set socket options:

//Get the UDP socket descriptor variable

setsockopt (sockfd , IPPROTO_UDP, SO_FRAMESIZE, &fs, sizeof(fs));

setsockopt (sockfd , IPPROTO_UDP, SOL_SCHEDCLASS, &cl, sizeof(cl));

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