Subject: Fw: [Bug 43277] New: net/e1000e set mtu larger than 1500 fails

From: Stephen Hemminger <[email-masked]>
Date: Tue, 22 May 2012 11:19:50 -0700

Begin forwarded message:

Date: Tue, 22 May 2012 18:13:21 +0000 (UTC)
From: [email-masked]
To: [email-masked]
Subject: [Bug 43277] New: net/e1000e set mtu larger than 1500 fails

https://bugzilla.kernel.org/show_bug.cgi?id=43277

           Summary: net/e1000e set mtu larger than 1500 fails
           Product: Networking
           Version: 2.5
    Kernel Version: 3.4
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IPV4
        AssignedTo: [email-masked]
        ReportedBy: [email-masked]
        Regression: Yes

In kernel 3.4 I can no longer use jumbo-frames with my e1000e network
interface.

 $ sudo ip link set eth1 mtu 9000
 RTNETLINK answers: Invalid argument

Card-info (from kernel-log)

 e1000e 0000:05:00.1: eth1: (PCI Express:2.5GT/s:Width x4) 00:1b:78:59:84:25
 e1000e 0000:05:00.1: eth1: Intel(R) PRO/1000 Network Connection
 e1000e 0000:05:00.1: eth1: MAC: 0, PHY: 4, PBA No: D51930-003

I have bisected and found:

 70495a500d787c0c90a136acf454cb7d0eecd82e is the first bad commit

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