[SRU][F:linux-bluefield][PATCH 09/21] xdp: For Intel AF_XDP drivers add XDP frame_sz

[Bodong Wang]

From: Jesper Dangaard Brouer <brouer at redhat.com>

BugLink: https://bugs.launchpad.net/bugs/1934499

Intel drivers implement native AF_XDP zerocopy in separate C-files,
that have its own invocation of bpf_prog_run_xdp(). The setup of
xdp_buff is also handled in separately from normal code path.

This patch update XDP frame_sz for AF_XDP zerocopy drivers i40e, ice
and ixgbe, as the code changes needed are very similar.  Introduce a
helper function xsk_umem_xdp_frame_sz() for calculating frame size.

Signed-off-by: Jesper Dangaard Brouer <brouer at redhat.com>
Signed-off-by: Alexei Starovoitov <ast at kernel.org>
Acked-by: Björn Töpel <bjorn.topel at intel.com>
Cc: intel-wired-lan at lists.osuosl.org
Cc: Magnus Karlsson <magnus.karlsson at intel.com>
Link: https://lore.kernel.org/bpf/158945347511.97035.8536753731329475655.stgit@firesoul
(backported from commit 2a637c5b1aaf3b21418fadffad7e56ff27cee6f7)
[maximmi: Removed Intel driver parts.]
Signed-off-by: Maxim Mikityanskiy <maximmi at nvidia.com>
Reviewed-by: Moshe Shemesh <moshe at nvidia.com>
Signed-off-by: Bodong Wang <bodong at nvidia.com>
---
 include/net/xdp_sock.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h
index c9398ce..66300b0 100644
--- a/include/net/xdp_sock.h
+++ b/include/net/xdp_sock.h
@@ -218,6 +218,12 @@ static inline u64 xsk_umem_adjust_offset(struct xdp_umem *umem, u64 address,
 	else
 		return address + offset;
 }
+
+static inline u32 xsk_umem_xdp_frame_sz(struct xdp_umem *umem)
+{
+	return umem->chunk_size_nohr + umem->headroom;
+}
+
 #else
 static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
 {
@@ -357,6 +363,11 @@ static inline u64 xsk_umem_adjust_offset(struct xdp_umem *umem, u64 handle,
 	return 0;
 }
 
+static inline u32 xsk_umem_xdp_frame_sz(struct xdp_umem *umem)
+{
+	return 0;
+}
+
 #endif /* CONFIG_XDP_SOCKETS */
 
 #endif /* _LINUX_XDP_SOCK_H */
-- 
1.8.3.1