Cong Wang says:
====================
net_sched: clean up tc classes and u32 filter
Patch 1 and patch 2 prepare for patch 3. Major changes
are in patch 3 and patch 4, details are there too.
v2: Add patch 1 and 2, group all into a patchset
Fix a coding style issue in patch 4
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
It is ugly to hide a u32-filter-specific pointer inside Qdisc,
this breaks the TC layers:
1. Qdisc is a generic representation, should not have any specific
data of any type
2. Qdisc layer is above filter layer, should only save filters in
the list of struct tcf_proto.
This pointer is used as the head of the chain of u32 hash tables,
that is struct tc_u_hnode, because u32 filter is very special,
it allows to create multiple hash tables within one qdisc and
across multiple u32 filters.
Instead of using this ugly pointer, we can just save it in a global
hash table key'ed by (dev ifindex, qdisc handle), therefore we can
still treat it as a per qdisc basis data structure conceptually.
Of course, because of network namespaces, this key is not unique
at all, but it is fine as we already have a pointer to Qdisc in
struct tc_u_common, we can just compare the pointers when collision.
And this only affects slow paths, has no impact to fast path,
thanks to the pointer ->tp_c.
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
For TC classes, their ->get() and ->put() are always paired, and the
reference counting is completely useless, because:
1) For class modification and dumping paths, we already hold RTNL lock,
so all of these ->get(),->change(),->put() are atomic.
2) For filter bindiing/unbinding, we use other reference counter than
this one, and they should have RTNL lock too.
3) For ->qlen_notify(), it is special because it is called on ->enqueue()
path, but we already hold qdisc tree lock there, and we hold this
tree lock when graft or delete the class too, so it should not be gone
or changed until we release the tree lock.
Therefore, this patch removes ->get() and ->put(), but:
1) Adds a new ->find() to find the pointer to a class by classid, no
refcnt.
2) Move the original class destroy upon the last refcnt into ->delete(),
right after releasing tree lock. This is fine because the class is
already removed from hash when holding the lock.
For those who also use ->put() as ->unbind(), just rename them to reflect
this change.
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Like for TC actions, ->delete() is a special case,
we have to prepare and fill the notification before delete
otherwise would get use-after-free after we remove the
reference count.
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This is not needed if we move them up properly.
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The skb_pad() function frees the skb on error, so this code has a double
free.
Fixes: 00e57a6d4a ("net-next/hinic: Add Tx operation")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David Lebrun says:
====================
net: updates for IPv6 Segment Routing
v2: seg6_lwt_headroom() is not relevant for lwtunnel_input_redirect()
use cases, and L2ENCAP only uses this redirection. Fix incoherence
between arbitrary MAC header size support and fixed headroom
computation by setting only LWTUNNEL_STATE_INPUT_REDIRECT for L2ENCAP
mode.
This patch series provides several updates for the SRv6 implementation. The
first patch leverages the existing infrastructure to support encapsulation
of IPv4 packets. The second patch implements the T.Encaps.L2 SR function,
enabling to encapsulate an L2 Ethernet frame within an IPv6+SRH packet.
The last three patches update the seg6local lightweight tunnel, and mainly
implement four new actions: End.T, End.DX2, End.DX4 and End.DT6.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch implements the following seg6local actions.
- SEG6_LOCAL_ACTION_END_T: regular SRH processing and forward to the
next-hop looked up in the specified routing table.
- SEG6_LOCAL_ACTION_END_DX2: decapsulate an L2 frame and forward it to
the specified network interface.
- SEG6_LOCAL_ACTION_END_DX4: decapsulate an IPv4 packet and forward it,
possibly to the specified next-hop.
- SEG6_LOCAL_ACTION_END_DT6: decapsulate an IPv6 packet and forward it
to the next-hop looked up in the specified routing table.
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch adds three helper functions to be used with the seg6local packet
processing actions.
The decap_and_validate() function will be used by the End.D* actions, that
decapsulate an SR-enabled packet.
The advance_nextseg() function applies the fundamental operations to update
an SRH for the next segment.
The lookup_nexthop() function helps select the next-hop for the processed
SR packets. It supports an optional next-hop address to route the packet
specifically through it, and an optional routing table to use.
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch ensures that the seg6local lightweight tunnel is used solely
with IPv6 routes and processes only IPv6 packets.
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch implements the L2 frame encapsulation mechanism, referred to
as T.Encaps.L2 in the SRv6 specifications [1].
A new type of SRv6 tunnel mode is added (SEG6_IPTUN_MODE_L2ENCAP). It only
accepts packets with an existing MAC header (i.e., it will not work for
locally generated packets). The resulting packet looks like IPv6 -> SRH ->
Ethernet -> original L3 payload. The next header field of the SRH is set to
NEXTHDR_NONE.
[1] https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-01
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch enables the SRv6 encapsulation mode to carry an IPv4 payload.
All the infrastructure was already present, I just had to add a parameter
to seg6_do_srh_encap() to specify the inner packet protocol, and perform
some additional checks.
Usage example:
ip route add 1.2.3.4 encap seg6 mode encap segs fc00::1,fc00::2 dev eth0
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
We now remove rndis filter before unregister_netdev(), which calls
device close. It involves closing rndis filter already removed.
This patch fixes this error.
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This series includes updates to mlx5 core driver.
From Gal and Saeed, three cleanup patches.
From Matan, Low level flow steering improvements and optimizations,
- Use more efficient data structures for flow steering objects handling.
- Add tracepoints to flow steering operations.
- Overall these patches improve flow steering rule insertion rate by a
factor of seven in large scales (~50K rules or more).
-Saeed.
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Merge tag 'mlx5-updates-2017-08-24' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux
Saeed Mahameed says:
====================
mlx5-updates-2017-08-24
This series includes updates to mlx5 core driver.
From Gal and Saeed, three cleanup patches.
From Matan, Low level flow steering improvements and optimizations,
- Use more efficient data structures for flow steering objects handling.
- Add tracepoints to flow steering operations.
- Overall these patches improve flow steering rule insertion rate by a
factor of seven in large scales (~50K rules or more).
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
We never set the error code in this function.
Fixes: eabf0fad81 ("net-next/hinic: Initialize api cmd resources")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
txq_reclaim() does the normal transmit queue reclamation and
rxq_deinit() does the RX ring cleanup, none of these are packet drops,
so use dev_consume_skb() for both locations.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
tg3_tx() does the normal packet TX completion,
tigon3_dma_hwbug_workaround() and tg3_tso_bug() both need to allocate a
new SKB that is suitable to workaround HW bugs, and finally
tg3_free_rings() is doing ring cleanup. Use dev_consume_skb_any() for
these 3 locations to be SKB drop monitor friendly.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jakub Sitnicki says:
====================
ipv6: Route ICMPv6 errors with the flow when ECMP in use
This patch set is another take at making Path MTU Discovery work when
server nodes are behind a router employing multipath routing in a
load-balance or anycast setup (that is, when not every end-node can be
reached by every path). The problem has been well described in RFC 7690
[1], but in short - in such setups ICMPv6 PTB errors are not guaranteed
to be routed back to the server node that sent a reply that exceeds path
MTU.
The proposed solution is two-fold:
(1) on the server side - reflect the Flow Label [2]. This can be done
without modifying the application using a new per-netns sysctl knob
that has been proposed independently of this patchset in the patch
entitled "ipv6: Add sysctl for per namespace flow label
reflection" [3].
(2) on the ECMP router - make the ipv6 routing subsystem look into the
ICMPv6 error packets and compute the flow-hash from its payload,
i.e. the offending packet that triggered the error. This is the
same behavior as ipv4 stack has already.
With both parts in place Path MTU Discovery can work past the ECMP
router when using IPv6.
[1] https://tools.ietf.org/html/rfc7690
[2] https://tools.ietf.org/html/draft-wang-6man-flow-label-reflection-01
[3] http://patchwork.ozlabs.org/patch/804870/
v1 -> v2:
- don't use "extern" in external function declaration in header file
- style change, put as many arguments as possible on the first line of
a function call, and align consecutive lines to the first argument
- expand the cover letter based on the feedback
v2 -> v3:
- switch to computing flow-hash using flow dissector to align with
recent changes to multipath routing in ipv4 stack
- add a sysctl knob for enabling flow label reflection per netns
---
Testing has covered multipath routing of ICMPv6 PTB errors in forward
and local output path in a simple use-case of an HTTP server sending a
reply which is over the path MTU size [3]. I have also checked if the
flows get evenly spread over multiple paths (i.e. if there are no
regressions) [4].
[3] https://github.com/jsitnicki/tools/tree/master/net/tests/ecmp/pmtud
[4] https://github.com/jsitnicki/tools/tree/master/net/tests/ecmp/load-balance
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Allow our callers to influence the choice of ECMP link by honoring the
hash passed together with the flow info. This allows for special
treatment of ICMP errors which we would like to route over the same path
as the IPv6 datagram that triggered the error.
Also go through rt6_multipath_hash(), in the usual case when we aren't
dealing with an ICMP error, so that there is one central place where
multipath hash is computed.
Signed-off-by: Jakub Sitnicki <jkbs@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Commit 644d0e6569 ("ipv6 Use get_hash_from_flowi6 for rt6 hash") has
turned rt6_info_hash_nhsfn() into a one-liner, so it no longer makes
sense to keep it around. Also remove the accompanying comment that has
become outdated.
Signed-off-by: Jakub Sitnicki <jkbs@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
When forwarding or sending out an ICMPv6 error, look at the embedded
packet that triggered the error and compute a flow hash over its
headers.
This let's us route the ICMP error together with the flow it belongs to
when multipath (ECMP) routing is in use, which in turn makes Path MTU
Discovery work in ECMP load-balanced or anycast setups (RFC 7690).
Granted, end-hosts behind the ECMP router (aka servers) need to reflect
the IPv6 Flow Label for PMTUD to work.
The code is organized to be in parallel with ipv4 stack:
ip_multipath_l3_keys -> ip6_multipath_l3_keys
fib_multipath_hash -> rt6_multipath_hash
Signed-off-by: Jakub Sitnicki <jkbs@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Allow for functions that fill out the IPv6 flow info to also pass a hash
computed over the skb contents. The hash value will drive the multipath
routing decisions.
This is intended for special treatment of ICMPv6 errors, where we would
like to make a routing decision based on the flow identifying the
offending IPv6 datagram that triggered the error, rather than the flow
of the ICMP error itself.
Signed-off-by: Jakub Sitnicki <jkbs@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
One too many arguments compared to the non-stub version.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Fixes: ffd3cdccf2 ("devlink: Add support for dynamic table size")
Signed-off-by: David S. Miller <davem@davemloft.net>
Reflecting IPv6 Flow Label at server nodes is useful in environments
that employ multipath routing to load balance the requests. As "IPv6
Flow Label Reflection" standard draft [1] points out - ICMPv6 PTB error
messages generated in response to a downstream packets from the server
can be routed by a load balancer back to the original server without
looking at transport headers, if the server applies the flow label
reflection. This enables the Path MTU Discovery past the ECMP router in
load-balance or anycast environments where each server node is reachable
by only one path.
Introduce a sysctl to enable flow label reflection per net namespace for
all newly created sockets. Same could be earlier achieved only per
socket by setting the IPV6_FL_F_REFLECT flag for the IPV6_FLOWLABEL_MGR
socket option.
[1] https://tools.ietf.org/html/draft-wang-6man-flow-label-reflection-01
Signed-off-by: Jakub Sitnicki <jkbs@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Make this const as it is only passed as an argument to the function
mlx5e_create_netdev and the corresponding argument is of type const.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Make these const as they are only used in a copy operation.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jesper Dangaard Brouer says:
====================
xdp: more work on xdp tracepoints
More work on streamlining and performance optimizing the tracepoints
for XDP.
I've created a simple xdp_monitor application that uses this
tracepoint, and prints statistics. Available at github:
https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/samples/bpf/xdp_monitor_kern.chttps://github.com/netoptimizer/prototype-kernel/blob/master/kernel/samples/bpf/xdp_monitor_user.c
The improvement over tracepoint with strcpy: 9810372 - 8428762 = +1381610 pps faster
- (1/9810372 - 1/8428762)*10^9 = -16.7 nanosec
- 100-(8428762/9810372*100) = strcpy-trace is 14.08% slower
- 981037/8428762*100 = removing strcpy made it 11.64% faster
V3: Fix merge conflict with commit e4a8e817d3 ("bpf: misc xdp redirect cleanups")
V2: Change trace_xdp_redirect() to align with args of trace_xdp_exception()
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Remove the net_device string name from the xdp_exception tracepoint,
like the xdp_redirect tracepoint.
Align the TP_STRUCT to have common entries between these two
tracepoint.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
There is too much overhead in the current trace_xdp_redirect
tracepoint as it does strcpy and strlen on the net_device names.
Besides, exposing the ifindex/index is actually the information that
is needed in the tracepoint to diagnose issues. When a lookup fails
(either ifindex or devmap index) then there is a need for saying which
to_index that have issues.
V2: Adjust args to be aligned with trace_xdp_exception.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
For XDP_REDIRECT the use of return code -EINVAL is confusing, as it is
used in three different cases. (1) When the index or ifindex lookup
fails, and in the ixgbe driver (2) when link is down and (3) when XDP
have not been enabled.
The return code can be picked up by the tracepoint xdp:xdp_redirect
for diagnosing why XDP_REDIRECT isn't working. Thus, there is a need
different return codes to tell the issues apart.
I'm considering using a specific err-code scheme for XDP_REDIRECT
instead of using these errno codes.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
If the xdp_do_generic_redirect() call fails, it trigger the
trace_xdp_exception tracepoint. It seems better to use the same
tracepoint trace_xdp_redirect, as the native xdp_do_redirect{,_map} does.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Given there is a tracepoint that can track the error code
of xdp_do_redirect calls, the WARN_ONCE in bpf_warn_invalid_xdp_redirect
doesn't seem relevant any longer. Simply remove the function.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jiri Pirko says:
====================
mlxsw: Add IPv4 host dpipe table
Arkadi says:
This patchset adds IPv4 host dpipe table support. This will provide the
ability to observe the hardware offloaded IPv4 neighbors.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Add support for controlling neighbor counters via dpipe.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add support for IPv4 host table dump.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add support for setting counters on neighbors based on dpipe's host table
counter status. This patch also adds the ability for getting the counter
value, which will be used by the dpipe host table implementation in the
next patches.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This is done as a preparation before introducing support for neighbor
counters. The flow counter's type enum is used by many registers, yet,
until now it was used only by mgpc and thus it was private. This patch
updates the namespace for more generic usage.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Change label name for case of erif table init failure.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This is done as a preparation before introducing the ability to dump the
host table via dpipe, and to count the table size. The mlxsw's neighbor
representative struct stays private to the router module.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The entry clear routine can be shared between the drivers, thus it is
moved inside devlink.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Up until now the dpipe table's size was static and known at registration
time. The host table does not have constant size and it is resized in
dynamic manner. In order to support this behavior the size is changed
to be obtained dynamically via an op.
This patch also adjust the current dpipe table for the new API.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Fix ERIF's table operations name space.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This will be used by the IPv4 host table which will be introduced in the
following patches. This header is global and can be reused by many
drivers.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This will be used by the IPv4 host table which will be introduced in the
following patches. This header is global and can be reused by many
drivers.
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
When adding a flow table entry (fte) to a flow table (ft), we first
need to find its flow group (fg). Currently, this is done by
traversing a linear list of all flow groups in the flow table.
Furthermore, since multiple flow groups which correspond to the same
fte mask may exist in the same ft, we can't just stop at the first
match. Converting the linear list to rhltable in order to speed things
up.
The last four patches increases the steering rules update rate by a
factor of more than 7 (for insertion of 50K steering rules).
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
When adding a flow table entry (fte) to a flow group (fg), we first
need to check whether this fte exist. In such a case we just merge
the destinations (if possible). Currently, this is done by traversing
the fte list available in a fg. This could take a lot of time when
using large flow groups. Speeding this up by using rhashtable, which
is much faster.
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
The current code stores fte_match_param in the software representation
of FTEs and FGs. fte_match_param contains a large reserved area at the
bottom of the struct. Since downstream patches are going to hash this
part, we would like to avoid doing so on a reserved part.
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
