xsk: Add shared umem support between queue ids

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Add support to share a umem between queue ids on the same
device. This mode can be invoked with the XDP_SHARED_UMEM bind
flag. Previously, sharing was only supported within the same
queue id and device, and you shared one set of fill and
completion rings. However, note that when sharing a umem between
queue ids, you need to create a fill ring and a completion ring
and tie them to the socket before you do the bind with the
XDP_SHARED_UMEM flag. This so that the single-producer
single-consumer semantics can be upheld.

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/1598603189-32145-12-git-send-email-magnus.karlsson@intel.com

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Magnus Karlsson 2020-08-28 10:26:25 +02:00 • committed by Daniel Borkmann

parent 9647c57b11

commit b5aea28dca

3 changed files with 56 additions and 16 deletions

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2

include/net/xsk_buff_pool.h

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44

net/xdp/xsk.c

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26

net/xdp/xsk_buff_pool.c

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