Date: Fri, 27 May 2016 00:23:02 -0700 From: "K. Macy" <kmacy@freebsd.org> To: Garrett Wollman <wollman@hergotha.csail.mit.edu>, "dmarquess@gmail.com" <dmarquess@gmail.com>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Changing MTU on cxgbe Message-ID: <CAHM0Q_P-BJXZf4pXqTpqUx4x4C7ZBTWXOeBxR=7r1BqzhXgU2w@mail.gmail.com> In-Reply-To: <20160527063731.GB10148@ox> References: <CAJpsHY4vF5Ky6GuAusLOOROgiQuyD2CcRmVxu8x3cArQRZxcbg@mail.gmail.com> <201605270457.u4R4vYqu018911@hergotha.csail.mit.edu> <20160527063731.GB10148@ox>
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On Thursday, May 26, 2016, Navdeep Parhar <nparhar@gmail.com> wrote: > On Fri, May 27, 2016 at 12:57:34AM -0400, Garrett Wollman wrote: > > In article < > CAJpsHY4vF5Ky6GuAusLOOROgiQuyD2CcRmVxu8x3cArQRZxcbg@mail.gmail.com > <javascript:;>> you write: > > > > ># ifconfig -m cxgbe0 > > >cxgbe0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> > > > > ># ifconfig cxgbe0 mtu 9000 > > >ifconfig: ioctl SIOCSIFMTU (set mtu): Invalid argument > > > > I believe this device, like many others, does not allow the MTU (or > > actually the MRU) to be changed once the receive ring has been set up > > This is not correct. You can change the MTU of a cxgbe/cxl interface at > any time (whether it's up or down, passing traffic or idle, etc.). For some reason the stack needs init to be called when the MTU is changed for it to actually change the size of the packets passed to the driver. At least cxgb does not do that. I'm not at my computer right now, but cxgbe may be the same. If that's the case just up / down the interface. It _will_ take effect without that if it's passed at module load. > > Regards,ll > Navdeep > _______________________________________________ > freebsd-net@freebsd.org <javascript:;> mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org > <javascript:;>" >
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