wireguard-linux/samples/bpf/xdpsock_user.c, branch jd/unified-crypt-queue

samples: bpf: Allow for -ENETDOWN in xdpsock

2020-02-05T21:06:09Z

ndo_xsk_wakeup() can return -ENETDOWN and there's no particular reason to bail the whole application out on that case. Let's check in kick_tx() whether errno was set to mentioned value and basically allow application to further process frames. Fixes: 248c7f9c0e21 ("samples/bpf: convert xdpsock to use libbpf for AF_XDP access") Reported-by: Cameron Elliott Signed-off-by: Maciej Fijalkowski Signed-off-by: Daniel Borkmann Acked-by: Björn Töpel Link: https://lore.kernel.org/bpf/20200205045834.56795-4-maciej.fijalkowski@intel.com

samples: bpf: Drop doubled variable declaration in xdpsock

2020-02-05T21:06:09Z

Seems that by accident there is a doubled declaration of global variable opt_xdp_bind_flags in xdpsock_user.c. The second one is uninitialized so compiler was simply ignoring it. To keep things clean, drop the doubled variable. Fixes: c543f5469822 ("samples/bpf: add unaligned chunks mode support to xdpsock") Signed-off-by: Maciej Fijalkowski Signed-off-by: Daniel Borkmann Acked-by: Björn Töpel Link: https://lore.kernel.org/bpf/20200205045834.56795-3-maciej.fijalkowski@intel.com

samples/bpf: Use consistent include paths for libbpf

2020-01-21T00:37:45Z

Fix all files in samples/bpf to include libbpf header files with the bpf/ prefix, to be consistent with external users of the library. Also ensure that all includes of exported libbpf header files (those that are exported on 'make install' of the library) use bracketed includes instead of quoted. To make sure no new files are introduced that doesn't include the bpf/ prefix in its include, remove tools/lib/bpf from the include path entirely, and use tools/lib instead. Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir") Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Alexei Starovoitov Acked-by: Jesper Dangaard Brouer Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk

samples/bpf: xdpsock: Add option to specify transmit fill pattern

2019-12-21T00:10:39Z

The UDP payload fill pattern can be specified using '-P' or '--tx-pkt-pattern' option. It is an unsigned 32 bit field and defaulted to 0x12345678. The IP and UDP checksum is calculated by the code as per the content of the packet before transmission. Signed-off-by: Jay Jayatheerthan Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191220085530.4980-7-jay.jayatheerthan@intel.com

samples/bpf: xdpsock: Add option to specify tx packet size

2019-12-21T00:10:39Z

New option '-s' or '--tx-pkt-size' has been added to specify the transmit packet size. The packet size ranges from 47 to 4096 bytes. When this option is not provided, it defaults to 64 byte packet. The code uses struct ethhdr, struct iphdr and struct udphdr to form the transmit packet. The MAC address, IP address and UDP ports are set to default values. The code calculates IP and UDP checksums before sending the packet. Checksum calculation code in Linux kernel is used for this purpose. The Ethernet FCS is not filled by the code. Signed-off-by: Jay Jayatheerthan Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191220085530.4980-6-jay.jayatheerthan@intel.com

samples/bpf: xdpsock: Add option to specify number of packets to send

2019-12-21T00:10:39Z

Use '-C' or '--tx-pkt-count' to specify number of packets to send. If it is not specified, the application sends packets forever. If packet count is not a multiple of batch size, last batch sent is less than the batch size. Signed-off-by: Jay Jayatheerthan Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191220085530.4980-5-jay.jayatheerthan@intel.com

samples/bpf: xdpsock: Add option to specify batch size

2019-12-21T00:10:39Z

New option to specify batch size for tx, rx and l2fwd has been added. This allows fine tuning to maximize performance. It is specified using '-b' or '--batch_size' options. When not specified default is 64. Signed-off-by: Jay Jayatheerthan Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191220085530.4980-4-jay.jayatheerthan@intel.com

samples/bpf: xdpsock: Use common code to handle signal and main exit

2019-12-21T00:10:39Z

Add code to do cleanup for signals and application completion in a unified fashion. The signal handler sets benckmark_done flag terminating the threads. The cleanup is called before returning from main() function. Signed-off-by: Jay Jayatheerthan Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191220085530.4980-3-jay.jayatheerthan@intel.com

samples/bpf: xdpsock: Add duration option to specify how long to run

2019-12-21T00:10:39Z

The application now supports '-d' or '--duration' option to specify number of seconds to run. This is used in tx, rx and l2fwd features. If this option is not provided, the application runs forever. Signed-off-by: Jay Jayatheerthan Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191220085530.4980-2-jay.jayatheerthan@intel.com

samples/bpf: Attach XDP programs in driver mode by default

2019-12-16T15:05:38Z

When attaching XDP programs, userspace can set flags to request the attach mode (generic/SKB mode, driver mode or hw offloaded mode). If no such flags are requested, the kernel will attempt to attach in driver mode, and then silently fall back to SKB mode if this fails. The silent fallback is a major source of user confusion, as users will try to load a program on a device without XDP support, and instead of an error they will get the silent fallback behaviour, not notice, and then wonder why performance is not what they were expecting. In an attempt to combat this, let's switch all the samples to default to explicitly requesting driver-mode attach. As part of this, ensure that all the userspace utilities have a switch to enable SKB mode. For those that have a switch to request driver mode, keep it but turn it into a no-op. Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Alexei Starovoitov Acked-by: Jesper Dangaard Brouer Acked-by: David Ahern Link: https://lore.kernel.org/bpf/20191216110742.364456-1-toke@redhat.com