git: bce: Implement multiple TX/RX rings and MSI-X support for 5709/5716

Sepherosa Ziehau sephe at
Wed Mar 6 04:29:35 PST 2013

commit b42386ee03a4e688c864ba8d7094064c63d93dce
Author: Sepherosa Ziehau <sephe at>
Date:   Wed Feb 27 21:53:37 2013 +0800

    bce: Implement multiple TX/RX rings and MSI-X support for 5709/5716
    5709/5716 support 9 RX rings, 9 TX rings and 9 MSI-X vectors; each
    MSI-X vector has its own interrupt moderation parameters.
    (N + 1) RX rings, N TX rings and (N + 1) MSI-X vectors will be enabled;
    N is ncpus2, if ncpus2 is less than 8, else N will be 8.
    The extra RX ring is enabled mainly because:
    The first RX ring is only used for packets whose RSS hash could not
    be calculated, so it is actually _not_ involved in RSS.  This extra RX
    ring is used for the packets whose masked RSS hash equal 0.
    An extra MSI-X vector is allocated for this extra RX ring; there is no
    correponding TX ring for this extra RX ring.  In polling(4), this extra
    RX ring is polled along with the first RX ring in the first RX polling
    handler, in which the packets whose RSS hash equal 0 should be processed.
    Hardware provided RSS hash and packet type are not utilized yet; they will
    be supported in the upcoming commits.
    Related hardware registers and hardware initialization order are infered
    from Linux's bnx2 (*); NetXtremeII-PG203-R.pdf provided on Broadcom's
    website does not contain enough information for multiple rings and MSI-X
    to function.
    (*) Unlike Linux's bnx2, which limits number of RX rings to 8, DragonFly
    limits number of RX rings to 9 and 9 RX rings actually work quite well.

Summary of changes:
 sys/conf/options              |   3 +-
 sys/config/LINT               |   3 +-
 sys/config/LINT64             |   3 +-
 sys/dev/netif/bce/Makefile    |   6 +-
 sys/dev/netif/bce/if_bce.c    | 915 +++++++++++++++++++++++++++++++++++++-----
 sys/dev/netif/bce/if_bcereg.h | 144 ++++++-
 6 files changed, 965 insertions(+), 109 deletions(-)

DragonFly BSD source repository

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