One good thing about ESFQ is the more flexible flow classification, but
I don't like the concept of having a set of selectable hash functions
very much.
These patches change SFQ to allow attaching external classifiers and add
a new "flow" classifier that allows to classify flows based on an arbitary
combination of pre-defined keys. Its probably not the fastest classifier
when used with multiple keys, but frankly, I don't think speed is very
important in most situations where the current SFQ implementation is used.
It currently does not support perturbation, I didn't want to move this into
the classifier, so I need to think about a way to handle it within SFQ.
Some examples:
# behave identical to internal SFQ hash
tc filter add ... flow baseclass x:1 classes 1024 \
keys src,dst,proto-src,proto-dst
# the same, but based on source address/port before NAT
tc filter add ... flow baseclass x:1 classes 1024 \
keys nfct-src,dst,nfct-proto-src,proto-dst
# classify based on UID
tc filter add ... flow baseclass x:1 classes 1024 \
keys sk-uid
and so on .. check out the iproute help text for the full set of supported
keys.
Comments welcome.
include/linux/pkt_cls.h | 37 +++
net/sched/Kconfig | 11
net/sched/Makefile | 1
net/sched/cls_flow.c | 570 ++++++++++++++++++++++++++++++++++++++++++++++++
net/sched/sch_sfq.c | 98 +++++++-
5 files changed, 713 insertions(+), 4 deletions(-)
Patrick McHardy (2):
[NET_SCHED]: sch_sfq: add support for external classifiers
[NET_SCHED]: Add flow classifier
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