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authorMagnus Karlsson <magnus.karlsson@intel.com>2020-08-28 10:26:27 +0200
committerDaniel Borkmann <daniel@iogearbox.net>2020-08-31 21:15:05 +0200
commit2f6324a3937f8517967d94daef2ba0bdceceece1 (patch)
treecc859d8a680e28657b9627b93099c7f7b7a3395e /samples
parenta1132430c2c55af62d13e9fca752d46f14d548b3 (diff)
downloadlwn-2f6324a3937f8517967d94daef2ba0bdceceece1.tar.gz
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libbpf: Support shared umems between queues and devices
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 <magnus.karlsson@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Björn Töpel <bjorn.topel@intel.com> Link: https://lore.kernel.org/bpf/1598603189-32145-14-git-send-email-magnus.karlsson@intel.com
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