Yonghong Song [Mon, 29 Oct 2018 22:32:03 +0000 (15:32 -0700)]
bpf: check map symbol type properly with newer llvm compiler
With llvm 7.0 or earlier, the map symbol type is STT_NOTYPE.
-bash-4.4$ cat t.c
__attribute__((section("maps"))) int g;
-bash-4.4$ clang -target bpf -O2 -c t.c
-bash-4.4$ readelf -s t.o
Symbol table '.symtab' contains 2 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 3 g
The following llvm commit enables BPF target to generate
proper symbol type and size.
commit bf6ec206615b9718869d48b4e5400d0c6e3638dd
Author: Yonghong Song <yhs@fb.com>
Date: Wed Sep 19 16:04:13 2018 +0000
[bpf] Symbol sizes and types in object file
Clang-compiled object files currently don't include the symbol sizes and
types. Some tools however need that information. For example, ctfconvert
uses that information to generate FreeBSD's CTF representation from ELF
files.
With this patch, symbol sizes and types are included in object files.
Signed-off-by: Paul Chaignon <paul.chaignon@orange.com> Reported-by: Yutaro Hayakawa <yhayakawa3720@gmail.com>
Hence, for llvm 8.0.0 (currently trunk), symbol type will be not NOTYPE, but OBJECT.
-bash-4.4$ clang -target bpf -O2 -c t.c
-bash-4.4$ readelf -s t.o
Symbol table '.symtab' contains 3 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 FILE LOCAL DEFAULT ABS t.c
2: 0000000000000000 4 OBJECT GLOBAL DEFAULT 3 g
This patch makes sure bpf library accepts both NOTYPE and OBJECT types
of global map symbols.
Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Stefano Brivio [Mon, 29 Oct 2018 22:04:25 +0000 (23:04 +0100)]
ss: Actually print left delimiter for columns
While rendering columns, we use a local variable to keep track of the
field currently being printed, without touching current_field, which is
used for buffering.
Use the right pointer to access the left delimiter for the current column,
instead of always printing the left delimiter for the last buffered field,
which is usually an empty string.
This fixes an issue especially visible on narrow terminals, where some
columns might be displayed without separation.
Reported-by: YoyPa <yoann.p.public@gmail.com> Fixes: 691bd854bf4a ("ss: Buffer raw fields first, then render them as a table") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Tested-by: YoyPa <yoann.p.public@gmail.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Peter Korsgaard [Sat, 27 Oct 2018 15:31:02 +0000 (17:31 +0200)]
utils.h: provide fallback CLOCK_TAI definition
q_{etf,taprio}.c uses CLOCK_TAI, which isn't exposed by glibc < 2.21 or
uClibc, breaking the build. Provide a fallback definition like it is done
for IPPROTO_MPLS and others.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Hangbin Liu [Mon, 22 Oct 2018 07:46:18 +0000 (15:46 +0800)]
ip/geneve: fix ttl inherit behavior
Currently when we add geneve with "ttl inherit", we only set ttl to 0, which
is actually use whatever default value instead of inherit the inner protocol's
ttl value.
To make a difference with ttl inherit and ttl == 0, we add an attribute
IFLA_GENEVE_TTL_INHERIT in kernel commit 52d0d404d39dd ("geneve: add ttl
inherit support"). Now let's use "ttl inherit" to inherit the inner
protocol's ttl, and use "ttl auto" to means "use whatever default value",
the same behavior with ttl == 0.
v2:
1) remove IFLA_GENEVE_TTL_INHERIT defination in if_link.h as it's already
updated.
2) Still use addattr8() so we can enable/disable ttl inherit, as Michal
suggested.
v3: Update man page
Reported-by: Jianlin Shi <jishi@redhat.com> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: David Ahern <dsahern@gmail.com>
Phil Sutter [Tue, 23 Oct 2018 10:36:24 +0000 (12:36 +0200)]
tc: htb: Print default value in hex
Value of 'default' is assumed to be hexadecimal when parsing, so
consequently it should be printed in hex as well. This is a regression
introduced when adding JSON output.
As requested, also change JSON output to print the value as hex string.
Fixes: f354fa6aa5ff0 ("tc: jsonify htb qdisc") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Phil Sutter [Thu, 18 Oct 2018 13:48:48 +0000 (15:48 +0200)]
tc: Remove pointless assignments in batch()
All these assignments are later overwritten without reading in between,
so just drop them.
Fixes: 485d0c6001c4a ("tc: Add batchsize feature for filter and actions") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Phil Sutter [Thu, 18 Oct 2018 13:44:14 +0000 (15:44 +0200)]
ip-route: Fix parse_encap_seg6() srh parsing
In case caller did not specify 'segs' parameter, parse_srh() would read
garbage while iterating over 'segbuf'. Avoid this by initializing
'segbuf' to an empty string.
Fixes: e8493916a8ede ("iproute: add support for SR-IPv6 lwtunnel encapsulation") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Phil Sutter [Thu, 18 Oct 2018 12:35:50 +0000 (14:35 +0200)]
rdma: Don't pass garbage to rd_check_is_filtered()
Variables 'src_port' and 'dst_port' are initialized only if attributes
RDMA_NLDEV_ATTR_RES_SRC_ADDR or RDMA_NLDEV_ATTR_RES_DST_ADDR are
present. Make sure to pass them over to rd_check_is_filtered() only if
that is the case.
Fixes: 9a362cc71a455 ("rdma: Add CM_ID resource tracking information") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Phil Sutter [Thu, 18 Oct 2018 12:30:31 +0000 (14:30 +0200)]
ip-route: Fix for memleak in error path
If call to rta_addattr_l() failed, parse_encap_seg6() would leak memory.
Fix this by making sure calls to free() are not skipped.
Fixes: bd59e5b1517b0 ("ip-route: Fix segfault with many nexthops") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Lorenzo Bianconi [Wed, 10 Oct 2018 15:00:58 +0000 (17:00 +0200)]
utils: fix get_rtnl_link_stats_rta stats parsing
iproute2 walks through the list of available tunnels using netlink
protocol in order to get device info instead of reading
them from proc filesystem. However the kernel reports device statistics
using IFLA_INET6_STATS/IFLA_INET6_ICMP6STATS attributes nested in
IFLA_PROTINFO one but iproutes expects these info in
IFLA_STATS64/IFLA_STATS attributes.
The issue can be triggered with the following reproducer:
$ip link add ip6d0 type ip6tnl mode ip6ip6 local 1111::1 remote 2222::1
$ip -6 -d -s tunnel show ip6d0
ip6d0: ipv6/ipv6 remote 2222::1 local 1111::1 encaplimit 4 hoplimit 64
tclass 0x00 flowlabel 0x00000 (flowinfo 0x00000000)
Dump terminated
Fix the issue introducing IFLA_INET6_STATS attribute parsing
Fixes: 3e953938717f ("iptunnel/ip6tunnel: Use netlink to walk through
tunnels list")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Lorenzo Bianconi [Wed, 10 Oct 2018 15:00:57 +0000 (17:00 +0200)]
uapi: add snmp header file
Introduce snmp header file. It will be used in subsequent patch in
order to parse device statistics reported in
IFLA_INET6_STATS/IFLA_INET6_ICMP6STATS netlink attributes
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Sabrina Dubroca [Fri, 12 Oct 2018 15:34:12 +0000 (17:34 +0200)]
macsec: fix off-by-one when parsing attributes
I seem to have had a massive brainfart with uses of
parse_rtattr_nested(). The rtattr* array must have MAX+1 elements, and
the call to parse_rtattr_nested must have MAX as its bound. Let's fix
those.
Sabrina Dubroca [Fri, 12 Oct 2018 15:34:32 +0000 (17:34 +0200)]
json: make 0xhex handle u64
Stephen converted macsec's sci to use 0xhex, but 0xhex handles
unsigned int's, not 64 bits ints. Thus, the output of the "ip macsec
show" command is mangled, with half of the SCI replaced with 0s:
# ip macsec show
11: macsec0: [...]
cipher suite: GCM-AES-128, using ICV length 16
TXSC: 0000000001560001 on SA 0
# ip -d link show macsec0
11: macsec0@ens3: [...]
link/ether 52:54:00:12:01:56 brd ff:ff:ff:ff:ff:ff promiscuity 0
macsec sci 5254001201560001 [...]
where TXSC and sci should match.
Fixes: c0b904de6211 ("macsec: support JSON") Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Phil Sutter [Tue, 9 Oct 2018 12:44:08 +0000 (14:44 +0200)]
bridge: fdb: Fix for missing keywords in non-JSON output
While migrating to JSON print library, some keywords were dropped from
standard output by accident. Add them back to unbreak output parsers.
Fixes: c7c1a1ef51aea ("bridge: colorize output and use JSON print library") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This patch adds support for the new backup port option that can be set
on a bridge port. If the port's carrier goes down all of the traffic
gets redirected to the configured backup port. We add the following new
arguments:
$ ip link set dev brport type bridge_slave backup_port brport2
$ ip link set dev brport type bridge_slave nobackup_port
$ bridge link set dev brport backup_port brport2
$ bridge link set dev brport nobackup_port
The man pages are updated respectively.
Also 2 minor style adjustments:
- add missing space to bridge man page's state argument
- use lower starting case for vlan_tunnel in ip-link man page (to be
consistent with the rest)
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David Ahern <dsahern@gmail.com>
Vlad Buslov [Mon, 8 Oct 2018 20:52:26 +0000 (23:52 +0300)]
libnetlink: fix use-after-free of message buf
In __rtnl_talk_iov() main loop, err is a pointer to memory in dynamically
allocated 'buf' that is used to store netlink messages. If netlink message
is an error message, buf is deallocated before returning with error code.
However, on return err->error code is checked one more time to generate
return value, after memory which err points to has already been
freed. Save error code in temporary variable and use the variable to
generate return value.
Fixes: c60389e4f9ea ("libnetlink: fix leak and using unused memory on error") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
tc: Add support for configuring the taprio scheduler
This traffic scheduler allows traffic classes states (transmission
allowed/not allowed, in the simplest case) to be scheduled, according
to a pre-generated time sequence. This is the basis of the IEEE
802.1Qbv specification.
The configuration format is similar to mqprio. The main difference is
the presence of a schedule, built by multiple "sched-entry"
definitions, each entry has the following format:
sched-entry <CMD> <GATE MASK> <INTERVAL>
The only supported <CMD> is "S", which means "SetGateStates",
following the IEEE 802.1Qbv-2015 definition (Table 8-6). <GATE MASK>
is a bitmask where each bit is a associated with a traffic class, so
bit 0 (the least significant bit) being "on" means that traffic class
0 is "active" for that schedule entry. <INTERVAL> is a time duration
in nanoseconds that specifies for how long that state defined by <CMD>
and <GATE MASK> should be held before moving to the next entry.
This schedule is circular, that is, after the last entry is executed
it starts from the first one, indefinitely.
The other parameters can be defined as follows:
- base-time: specifies the instant when the schedule starts, if
'base-time' is a time in the past, the schedule will start at
base-time + (N * cycle-time)
where N is the smallest integer so the resulting time is greater
than "now", and "cycle-time" is the sum of all the intervals of the
entries in the schedule;
- clockid: specifies the reference clock to be used;
The parameters should be similar to what the IEEE 802.1Q family of
specification defines.
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com> Signed-off-by: David Ahern <dsahern@gmail.com>
David Ahern [Wed, 3 Oct 2018 01:40:37 +0000 (18:40 -0700)]
Merge branch 'hdrs-for-dump-req' into iproute2-next
David Ahern says:
====================
iproute2 currently uses ifinfomsg as the header for all dumps using the
wilddump headers. This is wrong as each message type actually has its own
header type. While the kernel has traditionally let it go as it for the
most part only uses the family entry, the use of kernel side filters is
increasing to alter what is returned on a request. The kernel side filters
really need to use the proper header type.
To that end, fix iproute2 to use the proper header struct for the GET type.
David Ahern [Sat, 29 Sep 2018 17:12:59 +0000 (10:12 -0700)]
libnetlink: Rename rtnl_wilddump_stats_req_filter to rtnl_statsdump_req_filter
rtnl_wilddump_stats_req_filter only takes RTM_GETSTATS as the type argument
so rename to rtnl_statsdump_req_filter for consistency with other request
functions and hardcode the type argument.
David Ahern [Sat, 29 Sep 2018 16:56:57 +0000 (09:56 -0700)]
libnetlink: Rename rtnl_wilddump_* to rtnl_linkdump_*
Rename rtnl_wilddump_req_filter to rtnl_linkdump_req_filter,
rtnl_wilddump_request to rtnl_linkdump_req and
rtnl_wilddump_req_filter_fn to rtnl_linkdump_req_filter_fn.
In all cases drop the type argument which at this point is only
RTM_GETLINK and hardcode in the functions.
tc: f_flower: add geneve option match support to flower
Allow matching on options in Geneve tunnel headers.
The options can be described in the form
CLASS:TYPE:DATA/CLASS_MASK:TYPE_MASK:DATA_MASK, where CLASS is
represented as a 16bit hexadecimal value, TYPE as an 8bit
hexadecimal value and DATA as a variable length hexadecimal value.
e.g.
# ip link add name geneve0 type geneve dstport 0 external
# tc qdisc add dev geneve0 ingress
# tc filter add dev geneve0 protocol ip parent ffff: \
flower \
enc_src_ip 10.0.99.192 \
enc_dst_ip 10.0.99.193 \
enc_key_id 11 \
geneve_opts 0102:80:1122334421314151/ffff:ff:ffffffffffffffff \
ip_proto udp \
action mirred egress redirect dev eth1
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com> Signed-off-by: Simon Horman <simon.horman@netronome.com> Signed-off-by: David Ahern <dsahern@gmail.com>
Fixes: c60389e4f9ea ("libnetlink: fix leak and using unused memory on error") Reported-by: David Ahern <dsahern@gmail.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Lorenzo Bianconi [Fri, 21 Sep 2018 13:34:25 +0000 (15:34 +0200)]
iplink_vxlan: take into account preferred_family creating vxlan device
Take into account the configured preferred_family if neither saddr or
daddr are provided since otherwise vxlan kernel module will use IPv4 as
default remote inet family neglecting the one provided by userspace.
This behaviour was originally in commit 97d564b90ccb ("vxlan: use
preferred address family when neither group or remote is specified").
The issue can be triggered with the following reproducer:
$ip -6 link add vxlan1 type vxlan id 42 dev enp0s2 \
proxy nolearning l2miss l3miss
$bridge fdb add 46:47:1f:a7:1c:25 dev vxlan1 dst 2000::2
RTNETLINK answers: Address family not supported by protocol
Fixes: 1e9b8072de2c ("iplink_vxlan: Get rid of inet_get_addr()") Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Hangbin Liu [Tue, 18 Sep 2018 09:48:40 +0000 (17:48 +0800)]
iplink: fix incorrect any address handling for ip tunnels
After commit d42c7891d26e4 ("utils: Do not reset family for default, any,
all addresses"), when call get_addr() for any/all addresses, we will set
addr->flags to ADDRTYPE_INET_UNSPEC if family is AF_INET/AF_INET6, which
makes is_addrtype_inet() checking passed and assigns incorrect address
to kernel. The ip link cmd will return error like:
]# ip link add ipip1 type ipip local any remote 1.1.1.1
RTNETLINK answers: Numerical result out of range
Fix it by using is_addrtype_inet_not_unspec() to avoid unspec addresses.
geneve, vxlan are not affected as they use AF_UNSPEC family when call
get_addr()
Reported-by: Jianlin Shi <jishi@redhat.com> Fixes: d42c7891d26e4 ("utils: Do not reset family for default, any, all addresses") Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Petr Vorel [Wed, 19 Sep 2018 23:36:22 +0000 (01:36 +0200)]
testsuite: Fix missing generate_nlmsg
Commit ad23e152 caused generate_nlmsg to be always missing:
$ make alltests
make: ./tools/generate_nlmsg: Command not found
Create testclean: to remove only results directory.
Fixes: ad23e152 testsuite: remove all temp files and implement make clean Signed-off-by: Petr Vorel <petr.vorel@gmail.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
David Ahern [Fri, 21 Sep 2018 00:50:55 +0000 (17:50 -0700)]
Merge branch 'iproute2-master' into iproute2-next
Conflicts:
ip/iproute_lwtunnel.c
In addition to merge conflict between bd59e5b1517b and 94a8722f2f78,
updated the code added by the latter commit based on the change of the
former (ie., added ret = to the new rta_addattr_l).
Leon Romanovsky [Sun, 16 Sep 2018 17:28:13 +0000 (20:28 +0300)]
rdma: Fix representation of PortInfo CapabilityMask
The port capability mask represents IBTA PortInfo specification,
but as it is written in description of kernel commit 2f944c0fbf58
("RDMA: Fix storage of PortInfo CapabilityMask in the kernel"),
the bit 26 was mistakenly overwritten.
The rdmatool followed it too and mislead users by presenting wrong
value. Since it never showed proper value, we update the whole
port_cap_mask to comply with IBTA and show real HW values.
Fixes: da990ab40a92 ("rdma: Add link object") Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
libnetlink: fix leak and using unused memory on error
If an error happens in multi-segment message (tc only)
then report the error and stop processing further responses.
This also fixes refering to the buffer after free.
The sequence check is not necessary here because the
response message has already been validated to be in
the window of the sequence number of the iov.
Hangbin Liu [Wed, 12 Sep 2018 01:39:44 +0000 (09:39 +0800)]
bridge/mdb: fix missing new line when show bridge mdb
The bridge mdb show is broken on current iproute2. e.g.
]# bridge mdb show
34: br0 veth0_br 224.1.1.2 temp 34: br0 veth0_br 224.1.1.1 temp
After fix:
]# bridge mdb show
34: br0 veth0_br 224.1.1.2 temp
34: br0 veth0_br 224.1.1.1 temp
v2: Use json print lib as Stephen suggested.
v3: No need to use is_json_context() as print_string() could handle both cases.
v4: use new function print_nl() to print new line in non-json mode.
Reported-by: Ying Xu <yinxu@redhat.com> Fixes: c7c1a1ef51aea ("bridge: colorize output and use JSON print library") Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
When the GSO splitting was turned into dual split-gso/no-split-gso options,
the printing of the latter was left out. Add that, so output is consistent
with the options passed.
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Phil Sutter [Thu, 6 Sep 2018 13:31:51 +0000 (15:31 +0200)]
ip-route: Fix segfault with many nexthops
It was possible to crash ip-route by adding an IPv6 route with 37
nexthop statements. A simple reproducer is:
| for i in `seq 37`; do
| nhs="nexthop via 1111::$i "$nhs
| done
| ip -6 route add 3333::/64 $nhs
The related code was broken in multiple ways:
* parse_one_nh() assumed that rta points to 4kB of storage but caller
provided just 1kB. Fixed by passing 'len' parameter with the correct
value.
* Error checking of rta_addattr*() calls in parse_one_nh() and called
functions was completely absent, so with above fix in place output
flood would occur due to parser looping forever.
While being at it, increase message buffer sizes to 4k. This allows for
at most 144 nexthops.
Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
David Ahern [Thu, 30 Aug 2018 18:08:43 +0000 (11:08 -0700)]
Merge branch 'netem-slot-param' into iproute2-next
Yousuk Seung says:
====================
This series adds support for the new "slot" netem parameter for
slotting. Slotting is an approximation of shared media that gather up
packets within a varying delay window before delivering them nearly at
once.
Yousuk Seung [Mon, 27 Aug 2018 02:42:30 +0000 (19:42 -0700)]
q_netem: slotting with non-uniform distribution
Extend slotting with support for non-uniform distributions. This is
similar to netem's non-uniform distribution delay feature.
Syntax:
slot distribution DISTRIBUTION DELAY JITTER [packets MAX_PACKETS] \
[bytes MAX_BYTES]
The syntax and use of the distribution table is the same as in the
non-uniform distribution delay feature. A file DISTRIBUTION must be
present in TC_LIB_DIR (e.g. /usr/lib/tc) containing numbers scaled by
NETEM_DIST_SCALE. A random value x is selected from the table and it
takes DELAY + ( x * JITTER ) as delay. Correlation between values is not
supported.
Examples:
Normal distribution delay with mean = 800us and stdev = 100us.
> tc qdisc add dev eth0 root netem slot distribution normal \
800us 100us
Optionally set the max slot size in bytes and/or packets.
> tc qdisc add dev eth0 root netem slot distribution normal \
800us 100us bytes 64k packets 42
Signed-off-by: Yousuk Seung <ysseung@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Dave Taht <dave.taht@gmail.com> Signed-off-by: David Ahern <dsahern@gmail.com>
Dave Taht [Mon, 27 Aug 2018 02:42:29 +0000 (19:42 -0700)]
q_netem: support delivering packets in delayed time slots
Slotting is a crude approximation of the behaviors of shared media such
as cable, wifi, and LTE, which gather up a bunch of packets within a
varying delay window and deliver them, relative to that, nearly all at
once.
It works within the existing loss, duplication, jitter and delay
parameters of netem. Some amount of inherent latency must be specified,
regardless.
The new "slot" parameter specifies a minimum and maximum delay between
transmission attempts.
The "bytes" and "packets" parameters can be used to limit the amount of
information transferred per slot.
A more correct example, using stacked netem instances and a packet limit
to emulate a tail drop wifi queue with slots and variable packet
delivery, with a 200Mbit isochronous underlying rate, and 20ms path
delay:
Dave Taht [Mon, 27 Aug 2018 02:42:28 +0000 (19:42 -0700)]
tc: support conversions to or from 64 bit nanosecond-based time
Using a 32 bit field to represent time in nanoseconds results in a
maximum value of about 4.3 seconds, which is well below many observed
delays in WiFi and LTE, and barely in the ballpark for a trip past the
Earth's moon, Luna.
Using 64 bit time fields in nanoseconds allows us to simulate
network diameters of several hundred light-years. However, only
conversions to and from ns, us, ms, and seconds are provided.
The iproute2 64 bit api uses signed values for time. Being able to
represent positive or negative time allows us to calculate +/- deltas
between, for example, the CLOCK_TAI and CLOCK_REALTIME clocks.
Time related utility functions in tc_util.c are moved to lib/utils.c.
Signed-off-by: Yousuk Seung <ysseung@google.com> Signed-off-by: Dave Taht <dave.taht@gmail.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David Ahern <dsahern@gmail.com>
Mahesh Bandewar [Thu, 23 Aug 2018 01:01:37 +0000 (18:01 -0700)]
iproute: make clang happy
These are primarily fixes for "string is not string literal" warnings
/ errors (with -Werror -Wformat-nonliteral). This should be a no-op
change. I had to replace couple of print helper functions with the
code they call as it was becoming harder to eliminate these warnings,
however these helpers were used only at couple of places, so no
major change as such.
Signed-off-by: Mahesh Bandewar <maheshb@google.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
projects / mirror_iproute2.git / log