On Thu, Jul 05, 2018 at 03:09:33PM +0000, Eggert, Lars wrote: > Hi, > > when receiving packets via netmap (current GitHub version) on a Chelsio T6 > vcc0 device on -CURRENT, it appears that the Ethernet header starts at an > offset of two bytes into the netmap slot. So far, I have only used netmap with > various Intel NICs, where the Ethernet header starts at offset zero. > > Is this a bug? Is this to be expected?
Set hw.cxgbe.fl_pktshift=0 in loader.conf to stop the chip from doing this. See cxgbe(4) for details on the knob. It's a historic optimization that doesn't seem to matter on modern CPUs, so the driver default should probably be 0 instead of 2. Regards, Navdeep _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
