user/sven/linux.git/samples/bpf, branch v5.9.8

samples/bpf: Fix possible deadlock in xdpsock

2020-11-05T10:51:21Z

[ Upstream commit 5a2a0dd88f0f267ac5953acd81050ae43a82201f ] Fix a possible deadlock in the l2fwd application in xdpsock that can occur when there is no space in the Tx ring. There are two ways to get the kernel to consume entries in the Tx ring: calling sendto() to make it send packets and freeing entries from the completion ring, as the kernel will not send a packet if there is no space for it to add a completion entry in the completion ring. The Tx loop in l2fwd only used to call sendto(). This patches adds cleaning the completion ring in that loop. Signed-off-by: Magnus Karlsson Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/1599726666-8431-3-git-send-email-magnus.karlsson@gmail.com Signed-off-by: Sasha Levin

samples/bpf: Fix to xdpsock to avoid recycling frames

2020-10-29T09:11:15Z

[ Upstream commit b69e56cf765155dcac0037d7d0f162a2afab76c2 ] The txpush program in the xdpsock sample application is supposed to send out all packets in the umem in a round-robin fashion. The problem is that it only cycled through the first BATCH_SIZE worth of packets. Fixed this so that it cycles through all buffers in the umem as intended. Fixes: 248c7f9c0e21 ("samples/bpf: convert xdpsock to use libbpf for AF_XDP access") Signed-off-by: Weqaar Janjua Signed-off-by: Daniel Borkmann Acked-by: Björn Töpel Link: https://lore.kernel.org/bpf/20200828161717.42705-1-weqaar.a.janjua@intel.com Signed-off-by: Sasha Levin

treewide: Use fallthrough pseudo-keyword

2020-08-23T22:36:59Z

Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva

samples/bpf, selftests/bpf: Use bpf_probe_read_kernel

2020-07-21T20:26:26Z

A handful of samples and selftests fail to build on s390, because after commit 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work") bpf_probe_read is not available anymore. Fix by using bpf_probe_read_kernel. Signed-off-by: Ilya Leoshkevich Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200720114806.88823-1-iii@linux.ibm.com

samples/bpf: xdp_redirect_cpu: Load a eBPF program on cpumap

2020-07-16T15:00:32Z

Extend xdp_redirect_cpu_{usr,kern}.c adding the possibility to load a XDP program on cpumap entries. The following options have been added: - mprog-name: cpumap entry program name - mprog-filename: cpumap entry program filename - redirect-device: output interface if the cpumap program performs a XDP_REDIRECT to an egress interface - redirect-map: bpf map used to perform XDP_REDIRECT to an egress interface - mprog-disable: disable loading XDP program on cpumap entries Add xdp_pass, xdp_drop, xdp_redirect stats accounting Co-developed-by: Jesper Dangaard Brouer Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Lorenzo Bianconi Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/aa5a9a281b9dac425620fdabe82670ffb6bbdb92.1594734381.git.lorenzo@kernel.org

samples/bpf: xdp_redirect_cpu_user: Do not update bpf maps in option loop

2020-07-16T15:00:31Z

Do not update xdp_redirect_cpu maps running while option loop but defer it after all available options have been parsed. This is a preliminary patch to pass the program name we want to attach to the map entries as a user option Signed-off-by: Lorenzo Bianconi Signed-off-by: Daniel Borkmann Acked-by: Jesper Dangaard Brouer Link: https://lore.kernel.org/bpf/95dc46286fd2c609042948e04bb7ae1f5b425538.1594734381.git.lorenzo@kernel.org

samples: bpf: Add an option for printing extra statistics in xdpsock

2020-07-13T22:32:56Z

Introduce the --extra-stats (or simply -x) flag to the xdpsock application which prints additional statistics alongside the regular rx and tx counters. The new statistics printed report error conditions eg. rx ring full, invalid descriptors, etc. Signed-off-by: Ciara Loftus Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200708072835.4427-3-ciara.loftus@intel.com

bpf: Fix fds_example SIGSEGV error

2020-07-10T21:25:25Z

The `BPF_LOG_BUF_SIZE`'s value is `UINT32_MAX >> 8`, so define an array with it on stack caused an overflow. Signed-off-by: Wenbo Zhang Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200710092035.28919-1-ethercflow@gmail.com

samples: bpf: Refactor BPF map performance test with libbpf

2020-07-07T23:33:14Z

Previously, in order to set the numa_node attribute at the time of map creation using "libbpf", it was necessary to call bpf_create_map_node() directly (bpf_load approach), instead of calling bpf_object_load() that handles everything on its own, including map creation. And because of this problem, this sample had problems with refactoring from bpf_load to libbbpf. However, by commit 1bdb6c9a1c43 ("libbpf: Add a bunch of attribute getters/setters for map definitions") added the numa_node attribute and allowed it to be set in the map. By using libbpf instead of bpf_load, the inner map definition has been explicitly declared with BTF-defined format. Also, the element of ARRAY_OF_MAPS was also statically specified using the BTF format. And for this reason some logic in fixup_map() was not needed and changed or removed. Signed-off-by: Daniel T. Lee Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200707184855.30968-4-danieltimlee@gmail.com

samples: bpf: Refactor BPF map in map test with libbpf

2020-07-07T23:33:10Z

From commit 646f02ffdd49 ("libbpf: Add BTF-defined map-in-map support"), a way to define internal map in BTF-defined map has been added. Instead of using previous 'inner_map_idx' definition, the structure to be used for the inner map can be directly defined using array directive. __array(values, struct inner_map) This commit refactors map in map test program with libbpf by explicitly defining inner map with BTF-defined format. Signed-off-by: Daniel T. Lee Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200707184855.30968-3-danieltimlee@gmail.com