Kernel gained support for filtering link dumps with commit dc599f76c22b
("net: Add support for filtering link dump by master device and kind").
Add support to ip link command. If a user passes master device or
kind to ip link command they are added to the link dump request message.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Use kernel shared buffer occupancy control commands to make snapshot and
clear occupancy watermarks. Also, allow to show occupancy values in a
nice way.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Implement kernel devlink shared buffer interface. Introduce new object
"sb" and allow to browse the shared buffer parameters and also change
configuration.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Follow-up to kernel commit 6c9059817432 ("bpf: pre-allocate hash map
elements"). Add flags support, so that we can pass in BPF_F_NO_PREALLOC
flag for disallowing preallocation. Update examples accordingly and also
remove the BPF_* map helper macros from them as they were not very useful.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Add new signatures for BPF_FUNC_csum_diff, BPF_FUNC_skb_get_tunnel_opt
and BPF_FUNC_skb_set_tunnel_opt.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
There is only a single user who needs it to be reentrant (not really,
but it's safer like this), add rt_addr_n2a_r() for it to use.
Signed-off-by: Phil Sutter <phil@nwl.cc>
There are only three users which require it to be reentrant, the rest is
fine without. Instead, provide a reentrant format_host_r() for users
which need it.
Signed-off-by: Phil Sutter <phil@nwl.cc>
This adds two helper functions which map a given data field to a color,
so color_fprintf() statements don't have to be duplicated with only a
different color value depending on that data field's value. In order for
this to work in a generic way, COLOR_CLEAR has been added to serve as a
fallback default of uncolored output.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Netlink already provides hello_timer, tcn_timer, topology_change_timer
and gc_timer, so let's make them visible.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
This enables a user to remove an offline peer from the kernel data
structures. This could for example be useful when deliberately scaling
in peer nodes in a cloud environment.
Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
This enables a user to remove an offline peer from the kernel data
structures. This could for example be useful when deliberately scaling
in peer nodes in a cloud environment.
Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Fix a whitespace in bpf_dump_error() usage, and also a missing closing
bracket in ntohl() macro for eBPF programs.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This patch:
- Adds a utility function for parsing a 64 bit address
- Adds a utility function for converting a 64 bit address to ASCII
- Adds and ILA encap type in lwt tunnels
Signed-off-by: Tom Herbert <tom@herbertland.com>
Improve example files further and add a more generic set of possible
helpers for them that can be used.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
The recently introduced object pinning can be further extended in order
to allow sharing maps beyond tc namespace. F.e. maps that are being pinned
from tracing side, can be accessed through this facility as well.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
This larger work addresses one of the bigger remaining issues on
tc's eBPF frontend, that is, to allow for persistent file descriptors.
Whenever tc parses the ELF object, extracts and loads maps into the
kernel, these file descriptors will be out of reach after the tc
instance exits.
Meaning, for simple (unnested) programs which contain one or
multiple maps, the kernel holds a reference, and they will live
on inside the kernel until the program holding them is unloaded,
but they will be out of reach for user space, even worse with
(also multiple nested) tail calls.
For this issue, we introduced the concept of an agent that can
receive the set of file descriptors from the tc instance creating
them, in order to be able to further inspect/update map data for
a specific use case. However, while that is more tied towards
specific applications, it still doesn't easily allow for sharing
maps accross multiple tc instances and would require a daemon to
be running in the background. F.e. when a map should be shared by
two eBPF programs, one attached to ingress, one to egress, this
currently doesn't work with the tc frontend.
This work solves exactly that, i.e. if requested, maps can now be
_arbitrarily_ shared between object files (PIN_GLOBAL_NS) or within
a single object (but various program sections, PIN_OBJECT_NS) without
"loosing" the file descriptor set. To make that happen, we use eBPF
object pinning introduced in kernel commit b2197755b263 ("bpf: add
support for persistent maps/progs") for exactly this purpose.
The shipped examples/bpf/bpf_shared.c code from this patch can be
easily applied, for instance, as:
- classifier-classifier shared:
tc filter add dev foo parent 1: bpf obj shared.o sec egress
tc filter add dev foo parent ffff: bpf obj shared.o sec ingress
- classifier-action shared (here: late binding to a dummy classifier):
tc actions add action bpf obj shared.o sec egress pass index 42
tc filter add dev foo parent ffff: bpf obj shared.o sec ingress
tc filter add dev foo parent 1: bpf bytecode '1,6 0 0 4294967295,' \
action bpf index 42
The toy example increments a shared counter on egress and dumps its
value on ingress (if no sharing (PIN_NONE) would have been chosen,
map value is 0, of course, due to the two map instances being created):
[...]
<idle>-0 [002] ..s. 38264.788234: : map val: 4
<idle>-0 [002] ..s. 38264.788919: : map val: 4
<idle>-0 [002] ..s. 38264.789599: : map val: 5
[...]
... thus if both sections reference the pinned map(s) in question,
tc will take care of fetching the appropriate file descriptor.
The patch has been tested extensively on both, classifier and
action sides.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
David Ahern
Stephen Hemminger
Jiri Pirko
Daniel Borkmann
Stephen Hemminger
Phil Sutter
Nikolay Aleksandrov
Richard Alpe
Tom Herbert