xsk: Enable sharing of dma mappings

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Enable the sharing of dma mappings by moving them out from the buffer
pool. Instead we put each dma mapped umem region in a list in the umem
structure. If dma has already been mapped for this umem and device, it
is not mapped again and the existing dma mappings are reused.

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/1598603189-32145-9-git-send-email-magnus.karlsson@intel.com

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Magnus Karlsson 2020-08-28 10:26:22 +02:00 • committed by Daniel Borkmann

parent 7f7ffa4e9c

commit 921b68692a

4 changed files with 156 additions and 42 deletions

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1

include/net/xdp_sock.h

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13

include/net/xsk_buff_pool.h

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1

net/xdp/xdp_umem.c

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183

net/xdp/xsk_buff_pool.c

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