xsk: add umem fill queue support and mmap

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Here, we add another setsockopt for registered user memory (umem)
called XDP_UMEM_FILL_QUEUE. Using this socket option, the process can
ask the kernel to allocate a queue (ring buffer) and also mmap it
(XDP_UMEM_PGOFF_FILL_QUEUE) into the process.

The queue is used to explicitly pass ownership of umem frames from the
user process to the kernel. These frames will in a later patch be
filled in with Rx packet data by the kernel.

v2: Fixed potential crash in xsk_mmap.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Magnus Karlsson 2018-05-02 13:01:24 +02:00 • committed by Alexei Starovoitov

parent c0c77d8fb7

commit 423f38329d

7 changed files with 183 additions and 2 deletions

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15

include/uapi/linux/if_xdp.h

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2

net/xdp/Makefile

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5

net/xdp/xdp_umem.c

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2

net/xdp/xdp_umem.h

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65

net/xdp/xsk.c

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58

net/xdp/xsk_queue.c

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38

net/xdp/xsk_queue.h

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