xdp: fix possible cq entry leak

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Completion queue address reservation could not be undone.
In case of bad 'queue_id' or skb allocation failure, reserved entry
will be leaked reducing the total capacity of completion queue.

Fix that by moving reservation to the point where failure is not
possible. Additionally, 'queue_id' checking moved out from the loop
since there is no point to check it there.

Fixes: 35fcde7f8d ("xsk: support for Tx")
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: William Tu <u9012063@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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Ilya Maximets 2019-07-04 17:25:03 +03:00 • committed by Daniel Borkmann

parent 36db2a94f1

commit 675716400d

1 changed files with 4 additions and 7 deletions

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net/xdp/xsk.c

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