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  1. 24 Jun, 2021 19 commits
  3. 23 Jun, 2021 15 commits
    • David S. Miller's avatar
      Merge branch 'devlink-rate-limit-fixes' · 35713d9b
      David S. Miller authored 
      Dmytro Linkin says:

====================
Fixes for devlink rate objects API

Patch #1 fixes not decreased refcount of parent node for destroyed leaf
object.

Patch #2 fixes incorect eswitch mode check.

Patch #3 protects list traversing with a lock.

====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      35713d9b
    • Dmytro Linkin's avatar
      devlink: Protect rate list with lock while switching modes · a3e5e579
      Dmytro Linkin authored 
      Devlink eswitch set command doesn't hold devlink->lock, which makes
possible race condition between rate list traversing and others devlink
rate KAPI calls, like devlink_rate_nodes_destroy().
Hold devlink lock while traversing the list.

Fixes: a8ecb93e ("devlink: Introduce rate nodes")
Signed-off-by: default avatarDmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: default avatarParav Pandit <parav@nvidia.com>
Reviewed-by: default avatarJiri Pirko <jiri@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a3e5e579
    • Dmytro Linkin's avatar
      devlink: Remove eswitch mode check for mode set call · ff99324d
      Dmytro Linkin authored 
      When eswitch is disabled, querying its current mode results in error.
Due to this when trying to set the eswitch mode for mlx5 devices, it
fails to set the eswitch switchdev mode.
Hence remove such check.

Fixes: a8ecb93e ("devlink: Introduce rate nodes")
Signed-off-by: default avatarDmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: default avatarParav Pandit <parav@nvidia.com>
Reviewed-by: default avatarJiri Pirko <jiri@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ff99324d
    • Dmytro Linkin's avatar
      devlink: Decrease refcnt of parent rate object on leaf destroy · 1321ed5e
      Dmytro Linkin authored 
      Port functions, like SFs, can be deleted by the user when its leaf rate
object has parent node. In such case node refcnt won't be decreased
which blocks the node from deletion later.
Do simple refcnt decrease, since driver in cleanup stage. This:
1) assumes that driver took proper internal parent unset action;
2) allows to avoid nested callbacks call and deadlock.

Fixes: d7555984 ("devlink: Allow setting parent node of rate objects")
Signed-off-by: default avatarDmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: default avatarJiri Pirko <jiri@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1321ed5e
    • Xianting Tian's avatar
      virtio_net: Use virtio_find_vqs_ctx() helper · a2f7dc00
      Xianting Tian authored 
      virtio_find_vqs_ctx() is defined but never be called currently,
it is the right place to use it.
Signed-off-by: default avatarXianting Tian <xianting.tian@linux.alibaba.com>
Reviewed-by: default avatarStefano Garzarella <sgarzare@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a2f7dc00
    • Kuniyuki Iwashima's avatar
      net/tls: Remove the __TLS_DEC_STATS() macro. · 10ed7ce4
      Kuniyuki Iwashima authored 
      The commit d26b698d ("net/tls: add skeleton of MIB statistics")
introduced __TLS_DEC_STATS(), but it is not used and __SNMP_DEC_STATS() is
not defined also. Let's remove it.
Signed-off-by: default avatarKuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      10ed7ce4
    • Kuniyuki Iwashima's avatar
      tcp: Add stats for socket migration. · 55d444b3
      Kuniyuki Iwashima authored 
      This commit adds two stats for the socket migration feature to evaluate the
effectiveness: LINUX_MIB_TCPMIGRATEREQ(SUCCESS|FAILURE).

If the migration fails because of the own_req race in receiving ACK and
sending SYN+ACK paths, we do not increment the failure stat. Then another
CPU is responsible for the req.

Link: https://lore.kernel.org/bpf/CAK6E8=cgFKuGecTzSCSQ8z3YJ_163C0uwO9yRvfDSE7vOe9mJA@mail.gmail.com/Suggested-by: default avatarYuchung Cheng <ycheng@google.com>
Signed-off-by: default avatarKuniyuki Iwashima <kuniyu@amazon.co.jp>
Acked-by: default avatarYuchung Cheng <ycheng@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      55d444b3
    • David Wilder's avatar
      ibmveth: Set CHECKSUM_PARTIAL if NULL TCP CSUM. · 7525de25
      David Wilder authored 
      TCP checksums on received packets may be set to NULL by the sender if CSO
is enabled. The hypervisor flags these packets as check-sum-ok and the
skb is then flagged CHECKSUM_UNNECESSARY. If these packets are then
forwarded the sender will not request CSO due to the CHECKSUM_UNNECESSARY
flag. The result is a TCP packet sent with a bad checksum. This change
sets up CHECKSUM_PARTIAL on these packets causing the sender to correctly
request CSUM offload.
Signed-off-by: default avatarDavid Wilder <dwilder@us.ibm.com>
Reviewed-by: default avatarPradeep Satyanarayana <pradeeps@linux.vnet.ibm.com>
Tested-by: default avatarCristobal Forno <cforno12@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7525de25
    • David S. Miller's avatar
      Merge tag 'mlx5-net-next-2021-06-22' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux · fe87797b
      David S. Miller authored 
      Saeed Mahameed says:

====================
mlx5-net-next-2021-06-22

1) Various minor cleanups and fixes from net-next branch
2) Optimize mlx5 feature check on tx and
   a fix to allow Vxlan with Ipsec offloads
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fe87797b
    • David S. Miller's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next · a7b62112
      David S. Miller authored 
      Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following patchset contains Netfilter updates for net-next:

1) Skip non-SCTP packets in the new SCTP chunk support for nft_exthdr,
   from Phil Sutter.

2) Simplify TCP option sanity check for TCP packets, also from Phil.

3) Add a new expression to store when the rule has been used last time.

4) Pass the hook state object to log function, from Florian Westphal.

5) Document the new sysctl knobs to tune the flowtable timeouts,
   from Oz Shlomo.

6) Fix snprintf error check in the new nfnetlink_hook infrastructure,
   from Dan Carpenter.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a7b62112
    • Andrea Righi's avatar
      selftests: icmp_redirect: support expected failures · 0a36a75c
      Andrea Righi authored 
      According to a comment in commit 99513cfa ("selftest: Fixes for
icmp_redirect test") the test "IPv6: mtu exception plus redirect" is
expected to fail, because of a bug in the IPv6 logic that hasn't been
fixed yet apparently.

We should probably consider this failure as an "expected failure",
therefore change the script to return XFAIL for that particular test and
also report the total amount of expected failures at the end of the run.
Signed-off-by: default avatarAndrea Righi <andrea.righi@canonical.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0a36a75c
    • David S. Miller's avatar
      Merge branch 'lockless-qdisc-opts' · e940eb3c
      David S. Miller authored 
      Yunsheng Lin says:

====================
Some optimization for lockless qdisc

Patch 1: remove unnecessary seqcount operation.
Patch 2: implement TCQ_F_CAN_BYPASS.
Patch 3: remove qdisc->empty.

Performance data for pktgen in queue_xmit mode + dummy netdev
with pfifo_fast:

 threads    unpatched           patched             delta
    1       2.60Mpps            3.21Mpps             +23%
    2       3.84Mpps            5.56Mpps             +44%
    4       5.52Mpps            5.58Mpps             +1%
    8       2.77Mpps            2.76Mpps             -0.3%
   16       2.24Mpps            2.23Mpps             -0.4%

Performance for IP forward testing: 1.05Mpps increases to
1.16Mpps, about 10% improvement.

V3: Add 'Acked-by' from Jakub and 'Tested-by' from Vladimir,
    and resend based on latest net-next.
V2: Adjust the comment and commit log according to discussion
    in V1.
V1: Drop RFC tag, add nolock_qdisc_is_empty() and do the qdisc
    empty checking without the protection of qdisc->seqlock to
    aviod doing unnecessary spin_trylock() for contention case.
RFC v4: Use STATE_MISSED and STATE_DRAINING to indicate non-empty
        qdisc, and add patch 1 and 3.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e940eb3c
    • Yunsheng Lin's avatar
      net: sched: remove qdisc->empty for lockless qdisc · d3e0f575
      Yunsheng Lin authored 
      As MISSED and DRAINING state are used to indicate a non-empty
qdisc, qdisc->empty is not longer needed, so remove it.
Acked-by: default avatarJakub Kicinski <kuba@kernel.org>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com> # flexcan
Signed-off-by: default avatarYunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d3e0f575
    • Yunsheng Lin's avatar
      net: sched: implement TCQ_F_CAN_BYPASS for lockless qdisc · c4fef01b
      Yunsheng Lin authored 
      Currently pfifo_fast has both TCQ_F_CAN_BYPASS and TCQ_F_NOLOCK
flag set, but queue discipline by-pass does not work for lockless
qdisc because skb is always enqueued to qdisc even when the qdisc
is empty, see __dev_xmit_skb().

This patch calls sch_direct_xmit() to transmit the skb directly
to the driver for empty lockless qdisc, which aviod enqueuing
and dequeuing operation.

As qdisc->empty is not reliable to indicate a empty qdisc because
there is a time window between enqueuing and setting qdisc->empty.
So we use the MISSED state added in commit a90c57f2 ("net:
sched: fix packet stuck problem for lockless qdisc"), which
indicate there is lock contention, suggesting that it is better
not to do the qdisc bypass in order to avoid packet out of order
problem.

In order to make MISSED state reliable to indicate a empty qdisc,
we need to ensure that testing and clearing of MISSED state is
within the protection of qdisc->seqlock, only setting MISSED state
can be done without the protection of qdisc->seqlock. A MISSED
state testing is added without the protection of qdisc->seqlock to
aviod doing unnecessary spin_trylock() for contention case.

As the enqueuing is not within the protection of qdisc->seqlock,
there is still a potential data race as mentioned by Jakub [1]:

      thread1               thread2             thread3
qdisc_run_begin() # true
                        qdisc_run_begin(q)
                             set(MISSED)
pfifo_fast_dequeue
  clear(MISSED)
  # recheck the queue
qdisc_run_end()
                            enqueue skb1
                                             qdisc empty # true
                                          qdisc_run_begin() # true
                                          sch_direct_xmit() # skb2
                         qdisc_run_begin()
                            set(MISSED)

When above happens, skb1 enqueued by thread2 is transmited after
skb2 is transmited by thread3 because MISSED state setting and
enqueuing is not under the qdisc->seqlock. If qdisc bypass is
disabled, skb1 has better chance to be transmited quicker than
skb2.

This patch does not take care of the above data race, because we
view this as similar as below:
Even at the same time CPU1 and CPU2 write the skb to two socket
which both heading to the same qdisc, there is no guarantee that
which skb will hit the qdisc first, because there is a lot of
factor like interrupt/softirq/cache miss/scheduling afffecting
that.

There are below cases that need special handling:
1. When MISSED state is cleared before another round of dequeuing
   in pfifo_fast_dequeue(), and __qdisc_run() might not be able to
   dequeue all skb in one round and call __netif_schedule(), which
   might result in a non-empty qdisc without MISSED set. In order
   to avoid this, the MISSED state is set for lockless qdisc and
   __netif_schedule() will be called at the end of qdisc_run_end.

2. The MISSED state also need to be set for lockless qdisc instead
   of calling __netif_schedule() directly when requeuing a skb for
   a similar reason.

3. For netdev queue stopped case, the MISSED case need clearing
   while the netdev queue is stopped, otherwise there may be
   unnecessary __netif_schedule() calling. So a new DRAINING state
   is added to indicate this case, which also indicate a non-empty
   qdisc.

4. As there is already netif_xmit_frozen_or_stopped() checking in
   dequeue_skb() and sch_direct_xmit(), which are both within the
   protection of qdisc->seqlock, but the same checking in
   __dev_xmit_skb() is without the protection, which might cause
   empty indication of a lockless qdisc to be not reliable. So
   remove the checking in __dev_xmit_skb(), and the checking in
   the protection of qdisc->seqlock seems enough to avoid the cpu
   consumption problem for netdev queue stopped case.

1. https://lkml.org/lkml/2021/5/29/215Acked-by: default avatarJakub Kicinski <kuba@kernel.org>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com> # flexcan
Signed-off-by: default avatarYunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c4fef01b
    • Yunsheng Lin's avatar
      net: sched: avoid unnecessary seqcount operation for lockless qdisc · dd25296a
      Yunsheng Lin authored 
      qdisc->running seqcount operation is mainly used to do heuristic
locking on q->busylock for locked qdisc, see qdisc_is_running()
and __dev_xmit_skb().

So avoid doing seqcount operation for qdisc with TCQ_F_NOLOCK
flag.
Acked-by: default avatarJakub Kicinski <kuba@kernel.org>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com> # flexcan
Signed-off-by: default avatarYunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      dd25296a
  5. 22 Jun, 2021 6 commits
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