linux/net/sched
Paolo Valente 3015f3d2a3 pkt_sched: enable QFQ to support TSO/GSO
If the max packet size for some class (configured through tc) is
violated by the actual size of the packets of that class, then QFQ
would not schedule classes correctly, and the data structures
implementing the bucket lists may get corrupted. This problem occurs
with TSO/GSO even if the max packet size is set to the MTU, and is,
e.g., the cause of the failure reported in [1]. Two patches have been
proposed to solve this problem in [2], one of them is a preliminary
version of this patch.

This patch addresses the above issues by: 1) setting QFQ parameters to
proper values for supporting TSO/GSO (in particular, setting the
maximum possible packet size to 64KB), 2) automatically increasing the
max packet size for a class, lmax, when a packet with a larger size
than the current value of lmax arrives.

The drawback of the first point is that the maximum weight for a class
is now limited to 4096, which is equal to 1/16 of the maximum weight
sum.

Finally, this patch also forcibly caps the timestamps of a class if
they are too high to be stored in the bucket list. This capping, taken
from QFQ+ [3], handles the unfrequent case described in the comment to
the function slot_insert.

[1] http://marc.info/?l=linux-netdev&m=134968777902077&w=2
[2] http://marc.info/?l=linux-netdev&m=135096573507936&w=2
[3] http://marc.info/?l=linux-netdev&m=134902691421670&w=2

Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
Tested-by: Cong Wang <amwang@redhat.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-07 15:37:04 -05:00
..
Kconfig net: sched: add ipset ematch 2012-07-12 07:54:46 -07:00
Makefile net: sched: add ipset ematch 2012-07-12 07:54:46 -07:00
act_api.c netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
act_csum.c ipv6: correct the ipv6 option name - Pad0 to Pad1 2012-05-17 15:49:51 -04:00
act_gact.c net_sched: gact: Fix potential panic in tcf_gact(). 2012-08-03 16:47:24 -07:00
act_ipt.c net_sched: act: Delete estimator in error path. 2012-08-06 13:30:01 -07:00
act_mirred.c act_mirred: do not drop packets when fails to mirror it 2012-08-16 14:54:44 -07:00
act_nat.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
act_pedit.c net_sched: act: Delete estimator in error path. 2012-08-06 13:30:01 -07:00
act_police.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
act_simple.c net_sched: act: Delete estimator in error path. 2012-08-06 13:30:01 -07:00
act_skbedit.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
cls_api.c netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
cls_basic.c net sched: Pass the skb into change so it can access NETLINK_CB 2012-08-14 21:55:28 -07:00
cls_cgroup.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2012-10-02 11:11:09 -07:00
cls_flow.c userns: Convert cls_flow to work with user namespaces enabled 2012-08-14 21:55:28 -07:00
cls_fw.c net sched: Pass the skb into change so it can access NETLINK_CB 2012-08-14 21:55:28 -07:00
cls_route.c net sched: Pass the skb into change so it can access NETLINK_CB 2012-08-14 21:55:28 -07:00
cls_rsvp.c
cls_rsvp.h net sched: Pass the skb into change so it can access NETLINK_CB 2012-08-14 21:55:28 -07:00
cls_rsvp6.c
cls_tcindex.c net sched: Pass the skb into change so it can access NETLINK_CB 2012-08-14 21:55:28 -07:00
cls_u32.c net sched: Pass the skb into change so it can access NETLINK_CB 2012-08-14 21:55:28 -07:00
em_canid.c net: em_canid: Ematch rule to match CAN frames according to their identifiers 2012-07-04 13:07:05 +02:00
em_cmp.c
em_ipset.c net: sched: add ipset ematch 2012-07-12 07:54:46 -07:00
em_meta.c net: use a per task frag allocator 2012-09-24 16:31:37 -04:00
em_nbyte.c
em_text.c
em_u32.c
ematch.c net: Convert net_ratelimit uses to net_<level>_ratelimited 2012-05-15 13:45:03 -04:00
sch_api.c netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
sch_atm.c sch_atm.c: get rid of poinless extern 2012-06-01 10:37:18 -04:00
sch_blackhole.c
sch_cbq.c net-sched: sch_cbq: avoid infinite loop 2012-09-11 22:20:43 -04:00
sch_choke.c net: sched: factorize code (qdisc_drop()) 2012-05-04 11:50:05 -04:00
sch_codel.c fq_codel: should use qdisc backlog as threshold 2012-05-16 15:30:26 -04:00
sch_drr.c pkt_sched: Fix warning false positives. 2012-09-27 18:35:47 -04:00
sch_dsmark.c net: sched: factorize code (qdisc_drop()) 2012-05-04 11:50:05 -04:00
sch_fifo.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
sch_fq_codel.c fq_codel: dont reinit flow state 2012-09-03 14:36:50 -04:00
sch_generic.c net: qdisc busylock needs lockdep annotations 2012-09-05 17:49:27 -04:00
sch_gred.c net_sched: gred: actually perform idling in WRED mode 2012-09-13 16:10:13 -04:00
sch_hfsc.c net_sched: update bstats in dequeue() 2012-05-10 23:33:01 -04:00
sch_htb.c net_sched: update bstats in dequeue() 2012-05-10 23:33:01 -04:00
sch_ingress.c
sch_mq.c
sch_mqprio.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
sch_multiq.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
sch_netem.c netem: refine early skb orphaning 2012-07-16 23:08:33 -07:00
sch_plug.c
sch_prio.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
sch_qfq.c pkt_sched: enable QFQ to support TSO/GSO 2012-11-07 15:37:04 -05:00
sch_red.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
sch_sfb.c sch_sfb: Fix missing NULL check 2012-07-12 08:33:18 -07:00
sch_sfq.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
sch_tbf.c pkt_sched: Stop using NLA_PUT*(). 2012-04-01 18:11:37 -04:00
sch_teql.c sch_teql: Convert over to dev_neigh_lookup_skb(). 2012-07-05 01:09:06 -07:00