kernel/git/stable/linux.git/tools/lib/bpf/xsk.h, branch master

libbpf: move xsk.{c,h} into selftests/bpf

2022-06-28T20:13:32+00:00

Remove deprecated xsk APIs from libbpf. But given we have selftests relying on this, move those files (with minimal adjustments to make them compilable) under selftests/bpf. We also remove all the removed APIs from libbpf.map, while overall keeping version inheritance chain, as most APIs are backwards compatible so there is no need to reassign them as LIBBPF_1.0.0 versions. Cc: Magnus Karlsson Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/r/20220627211527.2245459-2-andrii@kernel.org Signed-off-by: Alexei Starovoitov

libbpf: Deprecate AF_XDP support

2021-11-02T01:12:44+00:00

Deprecate AF_XDP support in libbpf ([0]). This has been moved to libxdp as it is a better fit for that library. The AF_XDP support only uses the public libbpf functions and can therefore just use libbpf as a library from libxdp. The libxdp APIs are exactly the same so it should just be linking with libxdp instead of libbpf for the AF_XDP functionality. If not, please submit a bug report. Linking with both libraries is supported but make sure you link in the correct order so that the new functions in libxdp are used instead of the deprecated ones in libbpf. Libxdp can be found at https://github.com/xdp-project/xdp-tools. [0] Closes: https://github.com/libbpf/libbpf/issues/270 Signed-off-by: Magnus Karlsson Signed-off-by: Andrii Nakryiko Acked-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/bpf/20211029090111.4733-1-magnus.karlsson@gmail.com

libbpf: xsk: Move barriers from libbpf_util.h to xsk.h

2021-03-10T21:45:16+00:00

The only user of libbpf_util.h is xsk.h. Move the barriers to xsk.h, and remove libbpf_util.h. The barriers are used as an implementation detail, and should not be considered part of the stable API. Signed-off-by: Björn Töpel Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20210310080929.641212-3-bjorn.topel@gmail.com

libbpf, xsk: Add libbpf_smp_store_release libbpf_smp_load_acquire

2021-03-08T16:52:28+00:00

Now that the AF_XDP rings have load-acquire/store-release semantics, move libbpf to that as well. The library-internal libbpf_smp_{load_acquire,store_release} are only valid for 32-bit words on ARM64. Also, remove the barriers that are no longer in use. Signed-off-by: Björn Töpel Signed-off-by: Andrii Nakryiko Acked-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/bpf/20210305094113.413544-3-bjorn.topel@gmail.com

libbpf: Separate XDP program load with xsk socket creation

2020-12-03T18:37:59+00:00

Add support for separation of eBPF program load and xsk socket creation. This is needed for use-case when you want to privide as little privileges as possible to the data plane application that will handle xsk socket creation and incoming traffic. With this patch the data entity container can be run with only CAP_NET_RAW capability to fulfill its purpose of creating xsk socket and handling packages. In case your umem is larger or equal process limit for MEMLOCK you need either increase the limit or CAP_IPC_LOCK capability. To resolve privileges issue two APIs are introduced: - xsk_setup_xdp_prog - loads the built in XDP program. It can also return xsks_map_fd which is needed by unprivileged process to update xsks_map with AF_XDP socket "fd" - xsk_socket__update_xskmap - inserts an AF_XDP socket into an xskmap for a particular xsk_socket Signed-off-by: Mariusz Dudek Signed-off-by: Alexei Starovoitov Acked-by: Magnus Karlsson Link: https://lore.kernel.org/bpf/20201203090546.11976-2-mariuszx.dudek@intel.com

libbpf: Replace size_t with __u32 in xsk interfaces

2020-11-27T20:58:38+00:00

Replace size_t with __u32 in the xsk interfaces that contain this. There is no reason to have size_t since the internal variable that is manipulated is a __u32. The following APIs are affected: __u32 xsk_ring_prod__reserve(struct xsk_ring_prod *prod, __u32 nb, __u32 *idx) void xsk_ring_prod__submit(struct xsk_ring_prod *prod, __u32 nb) __u32 xsk_ring_cons__peek(struct xsk_ring_cons *cons, __u32 nb, __u32 *idx) void xsk_ring_cons__cancel(struct xsk_ring_cons *cons, __u32 nb) void xsk_ring_cons__release(struct xsk_ring_cons *cons, __u32 nb) The "nb" variable and the return values have been changed from size_t to __u32. Signed-off-by: Magnus Karlsson Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/1606383455-8243-1-git-send-email-magnus.karlsson@gmail.com

libbpf: Add support for canceling cached_cons advance

2020-11-25T12:18:47+00:00

Add a new function for returning descriptors the user received after an xsk_ring_cons__peek call. After the application has gotten a number of descriptors from a ring, it might not be able to or want to process them all for various reasons. Therefore, it would be useful to have an interface for returning or cancelling a number of them so that they are returned to the ring. This patch adds a new function called xsk_ring_cons__cancel that performs this operation on nb descriptors counted from the end of the batch of descriptors that was received through the peek call. Signed-off-by: Li RongQing Signed-off-by: Daniel Borkmann [ Magnus Karlsson: rewrote changelog ] Acked-by: Magnus Karlsson Link: https://lore.kernel.org/bpf/1606202474-8119-1-git-send-email-lirongqing@baidu.com

libbpf: Support shared umems between queues and devices

2020-08-31T19:15:05+00:00

Add support for shared umems between hardware queues and devices to the AF_XDP part of libbpf. This so that zero-copy can be achieved in applications that want to send and receive packets between HW queues on one device or between different devices/netdevs. In order to create sockets that share a umem between hardware queues and devices, a new function has been added called xsk_socket__create_shared(). It takes the same arguments as xsk_socket_create() plus references to a fill ring and a completion ring. So for every socket that share a umem, you need to have one more set of fill and completion rings. This in order to maintain the single-producer single-consumer semantics of the rings. You can create all the sockets via the new xsk_socket__create_shared() call, or create the first one with xsk_socket__create() and the rest with xsk_socket__create_shared(). Both methods work. Signed-off-by: Magnus Karlsson Signed-off-by: Daniel Borkmann Acked-by: Björn Töpel Link: https://lore.kernel.org/bpf/1598603189-32145-14-git-send-email-magnus.karlsson@intel.com

libbpf: add flags to umem config

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

This patch adds a 'flags' field to the umem_config and umem_reg structs. This will allow for more options to be added for configuring umems. The first use for the flags field is to add a flag for unaligned chunks mode. These flags can either be user-provided or filled with a default. Since we change the size of the xsk_umem_config struct, we need to version the ABI. This patch includes the ABI versioning for xsk_umem__create. The Makefile was also updated to handle multiple function versions in check-abi. Signed-off-by: Kevin Laatz Signed-off-by: Ciara Loftus Acked-by: Jonathan Lemon Signed-off-by: Daniel Borkmann

libbpf: add support for need_wakeup flag in AF_XDP part

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

This commit adds support for the new need_wakeup flag in AF_XDP. The xsk_socket__create function is updated to handle this and a new function is introduced called xsk_ring_prod__needs_wakeup(). This function can be used by the application to check if Rx and/or Tx processing needs to be explicitly woken up. Signed-off-by: Magnus Karlsson Acked-by: Jonathan Lemon Signed-off-by: Daniel Borkmann