Chelsio Communications Chelsio T5 Guide de l'utilisateur télécharger pdf (Page 218)

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XVI. Traffic Management

Chelsio T5/T4 Unified Wire For Linux Page 218

ethX: Chelsio interface

Modifying the application

The application can also be modified in order to associate connections to scheduling classes.

Follow the steps mentioned below:

1. Determine the TCP socket file descriptor in the application through which data is sent.

2. Declare and initialize a variable in the application:

int cl=1;

Here,

 cl is the TCP 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 7.

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

3. Add socket option definitions:

In order to use setsockopt() to set the options to the TCP socket, the following two definitions

need to be made:

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

 IPPROTO_TCP used for setting the type of IP Protocol.

# define SOL_SCHEDCLASS 290

# define IPPROTO_TCP 6

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

The setsockopt() call must be mentioned after the connect() call.

//Get the TCP socket descriptor variable

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

For more information on additional parameters, refer cop manual by running the

man cop command.

Note

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Chelsio Communications Chelsio T5 Guide de l'utilisateur Page 218

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