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  1. 23 May, 2018 15 commits
  3. 22 May, 2018 24 commits
    • David S. Miller's avatar
      Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue · 9c803cfd
      David S. Miller authored 
      Jeff Kirsher says:

====================
40GbE Intel Wired LAN Driver Updates 2018-05-22

This series contains updates to i40e only.

Jake provides all the changes in this series starting with making it
consistent in how we approach the bit lock.  Fixed the reporting of the
VEB statistics and the queue statistics to always return every queue
even if it is not currently in use.  Use WARN_ONCE() so that the first
time we end up with an incorrect size we will dump a stack trace and a
message to help highlight the issue early in testing.  Folded the fixed
string prefix into the stat string definition.  Instead of using a
separate char *p pointer when copying strings, use the data pointer
directly.  Added code comments for several of the statistic functions to
better explain the number and ordering of statistics.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9c803cfd
    • David S. Miller's avatar
      Merge branch 'tcp-ECN-quickack' · 119768c9
      David S. Miller authored 
      Eric Dumazet says:

====================
tcp: reduce quickack pressure for ECN

Small patch series changing TCP behavior vs quickack and ECN

First patch is a refactoring, adding parameter to tcp_incr_quickack()
and tcp_enter_quickack_mode() helpers.

Second patch implements the change, lowering number of ACK packets
sent after an ECN event.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      119768c9
    • Eric Dumazet's avatar
      tcp: do not aggressively quick ack after ECN events · 522040ea
      Eric Dumazet authored 
      ECN signals currently forces TCP to enter quickack mode for
up to 16 (TCP_MAX_QUICKACKS) following incoming packets.

We believe this is not needed, and only sending one immediate ack
for the current packet should be enough.

This should reduce the extra load noticed in DCTCP environments,
after congestion events.

This is part 2 of our effort to reduce pure ACK packets.
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Acked-by: default avatarYuchung Cheng <ycheng@google.com>
Acked-by: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      522040ea
    • Eric Dumazet's avatar
      tcp: add max_quickacks param to tcp_incr_quickack and tcp_enter_quickack_mode · 9a9c9b51
      Eric Dumazet authored 
      We want to add finer control of the number of ACK packets sent after
ECN events.

This patch is not changing current behavior, it only enables following
change.
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Acked-by: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9a9c9b51
    • Vlad Buslov's avatar
      net: sched: don't disable bh when accessing action idr · 290aa0ad
      Vlad Buslov authored 
      Initial net_device implementation used ingress_lock spinlock to synchronize
ingress path of device. This lock was used in both process and bh context.
In some code paths action map lock was obtained while holding ingress_lock.
Commit e1e992e5 ("[NET_SCHED] protect action config/dump from irqs")
modified actions to always disable bh, while using action map lock, in
order to prevent deadlock on ingress_lock in softirq. This lock was removed
from net_device, so disabling bh, while accessing action map, is no longer
necessary.

Replace all action idr spinlock usage with regular calls that do not
disable bh.
Signed-off-by: default avatarVlad Buslov <vladbu@mellanox.com>
Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      290aa0ad
    • David S. Miller's avatar
      Merge branch 'net-ipv6-Fix-route-append-and-replace-use-cases' · 73bf1fc5
      David S. Miller authored 
      David Ahern says:

====================
net/ipv6: Fix route append and replace use cases

This patch set fixes a few append and replace uses cases for IPv6 and
adds test cases that codifies the expectations of how append and replace
are expected to work. In paricular it allows a multipath route to have
a dev-only nexthop, something Thomas tried to accomplish with commit
edd7ceb7 ("ipv6: Allow non-gateway ECMP for IPv6") which had to be
reverted because of breakage, and to replace an existing FIB entry
with a reject route.

There are a number of inconsistent and surprising aspects to the Linux
API for adding, deleting, replacing and changing FIB entries. For example,
with IPv4 NLM_F_APPEND means insert the route after any existing entries
with the same key (prefix + priority + TOS for IPv4) and NLM_F_CREATE
without the append flag inserts the new route before any existing entries.

IPv6 on the other hand attempts to guess whether a new route should be
appended to an existing one, possibly creating a multipath route, or to
add a new entry after any existing ones. This applies to both the 'append'
(NLM_F_CREATE + NLM_F_APPEND) and 'prepend' (NLM_F_CREATE only) cases
meaning for IPv6 the NLM_F_APPEND is basically ignored. This guessing
whether the route should be added to a multipath route (gateway routes)
or inserted after existing entries (non-gateway based routes) means a
multipath route can not have a dev only nexthop (potentially required in
some cases - tunnels or VRF route leaking for example) and route 'replace'
is a bit adhoc treating gateway based routes and dev-only / reject routes
differently.

This has led to frustration with developers working on routing suites
such as FRR where workarounds such as delete and add are used instead of
replace.

After this patch set there are 2 differences between IPv4 and IPv6:
1. 'ip ro prepend' = NLM_F_CREATE only
    IPv4 adds the new route before any existing ones
    IPv6 adds new route after any existing ones

2. 'ip ro append' = NLM_F_CREATE|NLM_F_APPEND
   IPv4 adds the new route after any existing ones
   IPv6 adds the nexthop to existing routes converting to multipath

For the former, there are cases where we want same prefix routes added
after existing ones (e.g., multicast, prefix routes for macvlan when used
for virtual router redundancy). Requiring the APPEND flag to add a new
route to an existing one helps here but is a slight change in behavior
since prepend with gateway routes now create a separate entry.

For the latter IPv6 behavior is preferred - appending a route for the same
prefix and metric to make a multipath route, so really IPv4 not allowing an
existing route to be updated is the limiter. This will be fixed when
nexthops become separate objects - a future patch set.

Thank you to Thomas and Ido for testing earlier versions of this set, and
to Ido for providing an update to the mlxsw driver.

Changes since RFC
- cleanup wording in test script; add comments about expected failures
  and why
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      73bf1fc5
    • David Ahern's avatar
      selftests: fib_tests: Add ipv4 route add append replace tests · abb1860a
      David Ahern authored 
      Add IPv4 route tests covering add, append and replace permutations.
Assumes the ability to add a basic single path route works; this is
required for example when adding an address to an interface.

$ fib_tests.sh -t ipv4_rt

IPv4 route add / append tests
    TEST: Attempt to add duplicate route - gw                           [ OK ]
    TEST: Attempt to add duplicate route - dev only                     [ OK ]
    TEST: Attempt to add duplicate route - reject route                 [ OK ]
    TEST: Add new nexthop for existing prefix                           [ OK ]
    TEST: Append nexthop to existing route - gw                         [ OK ]
    TEST: Append nexthop to existing route - dev only                   [ OK ]
    TEST: Append nexthop to existing route - reject route               [ OK ]
    TEST: Append nexthop to existing reject route - gw                  [ OK ]
    TEST: Append nexthop to existing reject route - dev only            [ OK ]
    TEST: add multipath route                                           [ OK ]
    TEST: Attempt to add duplicate multipath route                      [ OK ]
    TEST: Route add with different metrics                              [ OK ]
    TEST: Route delete with metric                                      [ OK ]

IPv4 route replace tests
    TEST: Single path with single path                                  [ OK ]
    TEST: Single path with multipath                                    [ OK ]
    TEST: Single path with reject route                                 [ OK ]
    TEST: Single path with single path via multipath attribute          [ OK ]
    TEST: Invalid nexthop                                               [ OK ]
    TEST: Single path - replace of non-existent route                   [ OK ]
    TEST: Multipath with multipath                                      [ OK ]
    TEST: Multipath with single path                                    [ OK ]
    TEST: Multipath with single path via multipath attribute            [ OK ]
    TEST: Multipath with reject route                                   [ OK ]
    TEST: Multipath - invalid first nexthop                             [ OK ]
    TEST: Multipath - invalid second nexthop                            [ OK ]
    TEST: Multipath - replace of non-existent route                     [ OK ]
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      abb1860a
    • David Ahern's avatar
      selftests: fib_tests: Add ipv6 route add append replace tests · f9a5a9d8
      David Ahern authored 
      Add IPv6 route tests covering add, append and replace permutations.
Assumes the ability to add a basic single path route works; this is
required for example when adding an address to an interface.

$ fib_tests.sh -t ipv6_rt

IPv6 route add / append tests
    TEST: Attempt to add duplicate route - gw                           [ OK ]
    TEST: Attempt to add duplicate route - dev only                     [ OK ]
    TEST: Attempt to add duplicate route - reject route                 [ OK ]
    TEST: Add new route for existing prefix (w/o NLM_F_EXCL)            [ OK ]
    TEST: Append nexthop to existing route - gw                         [ OK ]
    TEST: Append nexthop to existing route - dev only                   [ OK ]
    TEST: Append nexthop to existing route - reject route               [ OK ]
    TEST: Append nexthop to existing reject route - gw                  [ OK ]
    TEST: Append nexthop to existing reject route - dev only            [ OK ]
    TEST: Add multipath route                                           [ OK ]
    TEST: Attempt to add duplicate multipath route                      [ OK ]
    TEST: Route add with different metrics                              [ OK ]
    TEST: Route delete with metric                                      [ OK ]

IPv6 route replace tests
    TEST: Single path with single path                                  [ OK ]
    TEST: Single path with multipath                                    [ OK ]
    TEST: Single path with reject route                                 [ OK ]
    TEST: Single path with single path via multipath attribute          [ OK ]
    TEST: Invalid nexthop                                               [ OK ]
    TEST: Single path - replace of non-existent route                   [ OK ]
    TEST: Multipath with multipath                                      [ OK ]
    TEST: Multipath with single path                                    [ OK ]
    TEST: Multipath with single path via multipath attribute            [ OK ]
    TEST: Multipath with reject route                                   [ OK ]
    TEST: Multipath - invalid first nexthop                             [ OK ]
    TEST: Multipath - invalid second nexthop                            [ OK ]
    TEST: Multipath - replace of non-existent route                     [ OK ]
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f9a5a9d8
    • David Ahern's avatar
      selftests: fib_tests: Add option to pause after each test · 7df15e6c
      David Ahern authored 
      Add option to pause after each test before cleanup is done. Allows
user to do manual inspection or more ad-hoc testing after each test
with the setup in tact.
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7df15e6c
    • David Ahern's avatar
      selftests: fib_tests: Add command line options · 1c7447b4
      David Ahern authored 
      Add command line options for controlling pause on fail, controlling
specific tests to run and verbose mode rather than relying on environment
variables.
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1c7447b4
    • David Ahern's avatar
      selftests: fib_tests: Add success-fail counts · 37ce42c1
      David Ahern authored 
      As more tests are added, it is convenient to have a tally at the end.
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      37ce42c1
    • David Ahern's avatar
      net/ipv6: Simplify route replace and appending into multipath route · f34436a4
      David Ahern authored 
      Bring consistency to ipv6 route replace and append semantics.

Remove rt6_qualify_for_ecmp which is just guess work. It fails in 2 cases:
1. can not replace a route with a reject route. Existing code appends
   a new route instead of replacing the existing one.

2. can not have a multipath route where a leg uses a dev only nexthop

Existing use cases affected by this change:
1. adding a route with existing prefix and metric using NLM_F_CREATE
   without NLM_F_APPEND or NLM_F_EXCL (ie., what iproute2 calls
   'prepend'). Existing code auto-determines that the new nexthop can
   be appended to an existing route to create a multipath route. This
   change breaks that by requiring the APPEND flag for the new route
   to be added to an existing one. Instead the prepend just adds another
   route entry.

2. route replace. Existing code replaces first matching multipath route
   if new route is multipath capable and fallback to first matching
   non-ECMP route (reject or dev only route) in case one isn't available.
   New behavior replaces first matching route. (Thanks to Ido for spotting
   this one)

Note: Newer iproute2 is needed to display multipath routes with a dev-only
      nexthop. This is due to a bug in iproute2 and parsing nexthops.
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f34436a4
    • David Ahern's avatar
      mlxsw: spectrum_router: Add support for route append · 5a15a1b0
      David Ahern authored 
      Handle append for gateway based routes. Dev-only multipath routes will
be handled by a follow on patch.
Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5a15a1b0
    • Jacob Keller's avatar
      i40e: use the more traditional 'i' loop variable · 3f76bdb4
      Jacob Keller authored 
      Since we no longer use i as an array index for the data variable,
replace the use of 'j' with 'i' so that we match the general loop
variable name.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      3f76bdb4
    • Jacob Keller's avatar
      i40e: add function doc headers for ethtool stats functions · ec29bbf8
      Jacob Keller authored 
      Add documentation for the i40e_get_stats_count, i40e_get_stat_strings
and i40e_get_ethtool_stats explaining that the number and ordering of
statistics must remain constant for a given netdevice.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      ec29bbf8
    • Jacob Keller's avatar
      i40e: update data pointer directly when copying to the buffer · e08696dc
      Jacob Keller authored 
      A future patch is going to add a helper function i40e_add_ethtool_stats
that will help lower the amount of boiler plate code in the
i40e_get_ethtool_stats function.

This conversion will take place over many patches, and the helper
function will work by directly updating a reference to the data pointer.

Since this would not work combined with the current method of accessing
data like an array, update all the code that copies stats into the data
buffer to use direct updates to the pointer instead of array accesses.

This will prevent incorrect stat updates for patches in between the
conversion.

Similarly, when copying strings, we used a separate char *p pointer.
Instead, use the data pointer directly as it's already a (u8 *) type
which is the same size.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      e08696dc
    • Jacob Keller's avatar
      i40e: fold prefix strings directly into stat names · bf1c39e6
      Jacob Keller authored 
      We always prefix these stats with a fixed string, so just fold this
prefix into the stat string definition. This preparatory work will make
it easier to implement a helper function to copy stats and strings into
the supplied buffers in a future patch.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      bf1c39e6
    • Jacob Keller's avatar
      i40e: use WARN_ONCE to replace the commented BUG_ON size check · 9b10df59
      Jacob Keller authored 
      We don't really want to use BUG_ON here since that would completely
crash the kernel, thus the reason we commented it out. We *can't* use
BUILD_BUG_ON because at least now (a) the sizes aren't constant (we are
fixing this) and (b) not all compilers are smart enough to understand
that "p - data" is a constant.

Instead, just use a WARN_ONCE so that the first time we end up with an
incorrect size we will dump a stack trace and a message, hopefully
highlighting the issues early in testing.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      9b10df59
    • Jacob Keller's avatar
      i40e: split i40e_get_strings() into smaller functions · 019b9cd4
      Jacob Keller authored 
      Split the statistic strings and private flags strings into their own
separate functions to aid code readability.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      019b9cd4
    • Jacob Keller's avatar
      i40e: always return all queue stat strings · b8312365
      Jacob Keller authored 
      The ethtool API for obtaining device statistics is not intended to allow
runtime changes in the number of statistics reported. It may *appear*
this way, as there is an ability to request the number of stats using
ethtool_get_set_count(). However, it is expected that this must always
return the same value for invocations of the same device.

If we don't satisfy this contract, and allow the number of stats to
change during run time, we could cause invalid memory accesses or report
the stat strings incorrectly. This is because the API for obtaining
stats is to (1) get the size, (2) get the strings and finally (3) get
the stats. Since these are each separate ethtool op commands, it is not
possible to maintain consistency by holding the RTNL lock over the whole
operation. This results in the potential for a race condition to occur
where the size changed between any of the 3 calls.

Avoid this issue by requiring that we always return the same value for
a given device. We can check any values which remain constant for the
life of the device, but must not report different sizes depending on
runtime attributes.

This patch specifically fixes the queue statistics to always return
every queue even if it's not currently in use.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      b8312365
    • Jacob Keller's avatar
      i40e: always return VEB stat strings · 9955d494
      Jacob Keller authored 
      The ethtool API for obtaining device statistics is not intended to allow
runtime changes in the number of statistics reported. It may *appear*
this way, as there is an ability to request the number of stats using
ethtool_get_set_count(). However, it is expected that this must always
return the same value for invocations of the same device.

If we don't satisfy this contract, and allow the number of stats to
change during run time, we could cause invalid memory accesses or report
the stat strings incorrectly. This is because the API for obtaining
stats is to (1) get the size, (2) get the strings and finally (3) get
the stats. Since these are each separate ethtool op commands, it is not
possible to maintain consistency by holding the RTNL lock over the whole
operation. This results in the potential for a race condition to occur
where the size changed between any of the 3 calls.

Avoid this issue by requiring that we always return the same value for
a given device. We can check any values which remain constant for the
life of the device, but must not report different sizes depending on
runtime attributes.

This patch specifically fixes the VEB statistics strings to always be
reported. Other issues will be fixed in future patches.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      9955d494
    • Jacob Keller's avatar
      i40e: free skb after clearing lock in ptp_stop · bdf27523
      Jacob Keller authored 
      Use the same logic to free the skb after clearing the Tx timestamp bit
lock in i40e_ptp_stop as we use in the other locations. It is not as
important here since we are not racing against a future Tx timestamp
request (as we are disabling PTP at this point). However it is good to
be consistent in how we approach the bit lock so that future callers
don't copy the old anti-pattern.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      bdf27523
    • Johannes Berg's avatar
      cfg80211: add missing kernel-doc · f3a7ca64
      Johannes Berg authored 
      Add the kernel-doc missed earlier.

Fixes: 52539ca8 ("cfg80211: Expose TXQ stats and parameters to userspace")
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      f3a7ca64
    • Denis Kenzior's avatar
      nl80211: Fix compilation · ba8f566a
      Denis Kenzior authored 
      Commit 7ea3e110 seems to have
introduced:

net/wireless/nl80211.c: In function ‘nl80211_get_station’:
net/wireless/nl80211.c:4802:34: error: incompatible type for argument 1 of ‘cfg80211_sinfo_release_content’
   cfg80211_sinfo_release_content(sinfo);
                                  ^~~~~
In file included from net/wireless/nl80211.c:24:0:
./include/net/cfg80211.h:5721:20: note: expected ‘struct station_info *’ but argument is of type ‘struct station_info’
 static inline void cfg80211_sinfo_release_content(struct station_info *sinfo)
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: 7ea3e110 ("cfg80211: release station info tidstats where needed")
Signed-off-by: default avatarDenis Kenzior <denkenz@gmail.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      ba8f566a
  5. 21 May, 2018 1 commit
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