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Jumbo Frame Support

Former Member

I've recently received a ZedBoard and attempted to turn on jumbo frames through both ifconfig(ifconfig eth0 mtu 9000) and the ioctl(ioctl(fd, SIOCSIFMTU, &mtustruct)).  Both gave me a response of an invalid argument.

Are jumbo frames supported on the ZedBoard, or do I need to recompile the kernel?

Thanks

  • 0

    Hi andyg,

    Here a snippet from the header of the r14.5 Xilinx Linux kernel driver source drivers/net/ethernet/xilinx/xilinx_emacps.c:

    /*

* Xilinx Ethernet: Linux driver for Ethernet.

*

* Author: Xilinx, Inc.

*

* 2010 (c) Xilinx, Inc. This file is licensed uner the terms of the GNU

* General Public License version 2. This program is licensed "as is"

* without any warranty of any kind, whether express or implied.

*

* This is a driver for xilinx processor sub-system (ps) ethernet device.

* This driver is mainly used in Linux 2.6.30 and above and it does _not_

* support Linux 2.4 kernel due to certain new features (e.g. NAPI) is

* introduced in this driver.

*

* TODO:

* 1. JUMBO frame is not enabled per EPs spec. Please update it if this

*    support is added in and set MAX_MTU to 9000.

     

    In V1.5 of UG585, Section 16.1.4, there is even further clarification on the Zynq hardware support for Jumbo frames:

     
    Section 16.1.4 Notices
    ...
    Jumbo Frames
    Jumbo frames are not supported
     
    Regards,
    -Kevin
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    Is there another driver that can be installed in Linux to get Jumbo frames for a Avnet MMP (7z045)?

    Steve Dean
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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						in reply to Former Member
					
									
    
	
    

		
		
    
					
    What exactly is the limitation preventing Jumbo Frames? Is it the Ethernet controller hardware? Can the MTU be set any higher than 1500?

    Steve
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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