Re: MTFTP file transfer timeout error

[Vabhav Sharma <vabhav.sharma@nxp.com>]

Dear Experts,

I traced that timeout error for different block size during file transfer using tftp(rrq opcode)  is returned from function  Mtftp4OnTimerTick() TFTP layer in UEFI network stack.
Mtftp4OnTimerTick()
    //
    // Retransmit the packet if haven't reach the maxmium retry count,
    // otherwise exit the transfer.
    //
    if (++Instance->CurRetry < Instance->MaxRetry) {
      Mtftp4Retransmit (Instance);
      Mtftp4SetTimeout (Instance);
    } else {
      Mtftp4CleanOperation (Instance, EFI_TIMEOUT);            //Timeout is set
      continue;
    }

Once this is set, It gets populated to downloadfile() function in tftp shellpkg library.
There seems to be issue(corruption) with tfp client state machine 
-Not sending ACK for received data blocks
-Sending duplicate ACK

If server don't receive ACK, It stops sending data packets and timeout occurs after maximum retry.
Please suggest if this is new or known issue to be fixed?

Regards,
Vabhav

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Vabhav Sharma
Sent: Thursday, September 28, 2017 5:04 PM
To: siyuan.fu@intel.com
Cc: edk2-devel@lists.01.org; edk2-devel <edk2-devel-bounces@lists.01.org>
Subject: Re: [edk2] MTFTP file transfer timeout error

[This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing at http://aka.ms/LearnAboutSpoofing]

Hello Fu Siyuan,
I see that blocksize option with tftp command is introduced with commit 2be45bfe2779043bc3566e879e7ec279412012dc.
Could you please help me clarify with the timeout error behavior observed in previous mail

Please note the behavior varies for different file type(Attached sheet) Regards, Vabhav

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Vabhav Sharma
Sent: Saturday, September 23, 2017 4:21 PM
To: edk2-devel@lists.01.org; edk2-devel <edk2-devel-bounces@lists.01.org>
Subject: [edk2] MTFTP file transfer timeout error

[This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing at http://aka.ms/LearnAboutSpoofing]

Hi All,
I am facing timeout error with file transfer using tftp on UEFI shell with ARM based SoCs Command used: tftp -s <blocksize> -i <interface> <server ip> <filename>

File transfer with file size greater 50 or 60 MB is returning timeout(Also depends on type of file like data file, ASCII file, boot sector)

I verified by playing around with blocksize from 32K to 42K for different file size(100MB,200MB,500MB) and identify that increasing the block size for large file size helps with successful transfer.
File transfer is always successful with 1K blocksize but file transfer time is increased.

Please suggest if there is any link between block size with file size or anyone faced such issue? I assume expectation is to use any blocksize from 512(default) to 64K.

Regards,
Vabhav
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.01.org
https://lists.01.org/mailman/listinfo/edk2-devel
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.01.org
https://lists.01.org/mailman/listinfo/edk2-devel