On Fri, Sep 11, 2020 at 12:33 PM Scheffenegger, Richard <richard.scheffeneg...@netapp.com> wrote: > > Hi, > > Currently, upstream head has only an IOCTL API to set up interface-wide > default PCP marking: > > #define SIOCGVLANPCP SIOCGLANPCP /* Get VLAN PCP */ > #define SIOCSVLANPCP SIOCSLANPCP /* Set VLAN PCP */ > > And the interface is via ifconfig <if> pcp <x>. > > However, while this allows all traffic sent via a specific interface to be > marked with a PCP (priority code point), it defeats the purpose of PFC > (priority flow control) which works by individually pausing different queues > of an interface, provided there is an actual differentiation of traffic into > those various classes. > > Internally, we have added a socket option (SO_VLAN_PCP) to change the PCP > specifically for traffic associated with that socket, to be marked > differently from whatever the interface default is (unmarked, or the default > PCP). > > Does the community see value in having such a socket option widely available? > (Linux currently doesn't seem to have a per-socket option either, only a > per-interface IOCTL API). > > Best regards, > > Richard Scheffenegger > > _______________________________________________ > freebsd-transp...@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-transport > To unsubscribe, send any mail to "freebsd-transport-unsubscr...@freebsd.org"
Hi Richard, At $WORK we're running into situations where PFC support would be very useful, so I think that this would be a good thing to add. I have a question: does your work also communicate the priority value for an mbuf down to the Ethernet driver, so that it can put the packet in the proper queue? _______________________________________________ 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"
