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xsk: Fix xsk_umem_xdp_frame_sz()

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Calculating the "data_hard_end" for an XDP buffer coming from AF_XDP
zero-copy mode, the return value of xsk_umem_xdp_frame_sz() is added
to "data_hard_start".

Currently, the chunk size of the UMEM is returned by
xsk_umem_xdp_frame_sz(). This is not correct, if the fixed UMEM
headroom is non-zero. Fix this by returning the chunk_size without the
UMEM headroom.

Fixes: 2a637c5b1aaf ("xdp: For Intel AF_XDP drivers add XDP frame_sz")
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200520192103.355233-2-bjorn.topel@gmail.com
This commit is contained in:
Björn Töpel 2020-05-20 21:20:49 +02:00 committed by Alexei Starovoitov
parent dda18a5c0b
commit 44ac082b30
1 changed files with 1 additions and 1 deletions
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2
include/net/xdp_sock.h
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@ -239,7 +239,7 @@ static inline u64 xsk_umem_adjust_offset(struct xdp_umem *umem, u64 address,
static inline u32 xsk_umem_xdp_frame_sz(struct xdp_umem *umem)
{
return umem->chunk_size_nohr + umem->headroom;
return umem->chunk_size_nohr;
}
#else