linux.git/samples/bpf, branch v5.4-rc2

samples/bpf: fix xdpsock l2fwd tx for unaligned mode

2019-09-16T07:35:10+00:00

Preserve the offset of the address of the received descriptor, and include
it in the address set for the tx descriptor, so the kernel can correctly
locate the start of the packet data.

Fixes: 03895e63ff97 ("samples/bpf: add buffer recycling for unaligned chunks to xdpsock")
Signed-off-by: Ciara Loftus 
Signed-off-by: Daniel Borkmann

samples/bpf: use hugepages in xdpsock app

2019-08-30T23:08:27+00:00

This patch modifies xdpsock to use mmap instead of posix_memalign. With
this change, we can use hugepages when running the application in unaligned
chunks mode. Using hugepages makes it more likely that we have physically
contiguous memory, which supports the unaligned chunk mode better.

Signed-off-by: Kevin Laatz 
Acked-by: Jonathan Lemon 
Signed-off-by: Daniel Borkmann

samples/bpf: add buffer recycling for unaligned chunks to xdpsock

2019-08-30T23:08:26+00:00

This patch adds buffer recycling support for unaligned buffers. Since we
don't mask the addr to 2k at umem_reg in unaligned mode, we need to make
sure we give back the correct (original) addr to the fill queue. We achieve
this using the new descriptor format and associated masks. The new format
uses the upper 16-bits for the offset and the lower 48-bits for the addr.
Since we have a field for the offset, we no longer need to modify the
actual address. As such, all we have to do to get back the original address
is mask for the lower 48 bits (i.e. strip the offset and we get the address
on it's own).

Signed-off-by: Kevin Laatz 
Signed-off-by: Bruce Richardson 
Acked-by: Jonathan Lemon 
Signed-off-by: Daniel Borkmann

samples/bpf: add unaligned chunks mode support to xdpsock

2019-08-30T23:08:26+00:00

This patch adds support for the unaligned chunks mode. The addition of the
unaligned chunks option will allow users to run the application with more
relaxed chunk placement in the XDP umem.

Unaligned chunks mode can be used with the '-u' or '--unaligned' command
line options.

Signed-off-by: Kevin Laatz 
Signed-off-by: Ciara Loftus 
Acked-by: Jonathan Lemon 
Signed-off-by: Daniel Borkmann

samples: bpf: syscall_nrs: use mmap2 if defined

2019-08-21T12:31:38+00:00

For arm32 xdp sockets mmap2 is preferred, so use it if it's defined.
Declaration of __NR_mmap can be skipped and it breaks build.

Signed-off-by: Ivan Khoronzhuk 
Acked-by: Jonathan Lemon 
Signed-off-by: Daniel Borkmann

samples/bpf: add use of need_wakeup flag in xdpsock

2019-08-17T21:07:32+00:00

This commit adds using the need_wakeup flag to the xdpsock sample
application. It is turned on by default as we think it is a feature
that seems to always produce a performance benefit, if the application
has been written taking advantage of it. It can be turned off in the
sample app by using the '-m' command line option.

The txpush and l2fwd sub applications have also been updated to
support poll() with multiple sockets.

Signed-off-by: Magnus Karlsson 
Acked-by: Jonathan Lemon 
Signed-off-by: Daniel Borkmann

samples/bpf: xdp_fwd explain bpf_fib_lookup return codes

2019-08-09T16:05:03+00:00

Make it clear that this XDP program depend on the network
stack to do the ARP resolution.  This is connected with the
BPF_FIB_LKUP_RET_NO_NEIGH return code from bpf_fib_lookup().

Another common mistake (seen via XDP-tutorial) is that users
don't realize that sysctl net.ipv{4,6}.conf.all.forwarding
setting is honored by bpf_fib_lookup.

Reported-by: Anton Protopopov 
Signed-off-by: Jesper Dangaard Brouer 
Reviewed-by: David Ahern 
Acked-by: Yonghong Song 
Reviewed-by: Toke Høiland-Jørgensen 
Signed-off-by: Daniel Borkmann

samples/bpf: make xdp_fwd more practically usable via devmap lookup

2019-08-09T16:05:03+00:00

This address the TODO in samples/bpf/xdp_fwd_kern.c, which points out
that the chosen egress index should be checked for existence in the
devmap. This can now be done via taking advantage of Toke's work in
commit 0cdbb4b09a06 ("devmap: Allow map lookups from eBPF").

This change makes xdp_fwd more practically usable, as this allows for
a mixed environment, where IP-forwarding fallback to network stack, if
the egress device isn't configured to use XDP.

Signed-off-by: Jesper Dangaard Brouer 
Reviewed-by: David Ahern 
Reviewed-by: Toke Høiland-Jørgensen 
Acked-by: Yonghong Song 
Signed-off-by: Daniel Borkmann

samples/bpf: xdp_fwd rename devmap name to be xdp_tx_ports

2019-08-09T16:05:03+00:00

The devmap name 'tx_port' came from a copy-paste from xdp_redirect_map
which only have a single TX port. Change name to xdp_tx_ports
to make it more descriptive.

Signed-off-by: Jesper Dangaard Brouer 
Reviewed-by: David Ahern 
Acked-by: Yonghong Song 
Reviewed-by: Toke Høiland-Jørgensen 
Signed-off-by: Daniel Borkmann

samples/bpf: switch trace_output sample to perf_buffer API

2019-07-23T23:05:42+00:00

Convert trace_output sample to libbpf's perf_buffer API.

Signed-off-by: Andrii Nakryiko 
Acked-by: Song Liu 
Signed-off-by: Alexei Starovoitov