From 2f6324a3937f8517967d94daef2ba0bdceceece1 Mon Sep 17 00:00:00 2001 From: Magnus Karlsson Date: Fri, 28 Aug 2020 10:26:27 +0200 Subject: libbpf: Support shared umems between queues and devices MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 --- tools/lib/bpf/libbpf.map | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/lib/bpf/libbpf.map') diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 66a6286d0716..3fedcdc4ae2f 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -306,4 +306,5 @@ LIBBPF_0.2.0 { perf_buffer__buffer_fd; perf_buffer__epoll_fd; perf_buffer__consume_buffer; + xsk_socket__create_shared; } LIBBPF_0.1.0; -- cgit v1.2.3