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Date:   Tue, 19 May 2020 10:57:10 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     ast@...nel.org, daniel@...earbox.net, davem@...emloft.net,
        kuba@...nel.org, hawk@...nel.org, john.fastabend@...il.com,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        magnus.karlsson@...el.com, jonathan.lemon@...il.com,
        jeffrey.t.kirsher@...el.com
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        maximmi@...lanox.com, maciej.fijalkowski@...el.com
Subject: [PATCH bpf-next v3 01/15] xsk: fix xsk_umem_xdp_frame_sz()

From: Björn Töpel <bjorn.topel@...el.com>

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@...el.com>
---
 include/net/xdp_sock.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h
index abd72de25fa4..6b1137ce1692 100644
--- a/include/net/xdp_sock.h
+++ b/include/net/xdp_sock.h
@@ -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
-- 
2.25.1

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