[PATCH net-next v2 06/12] net: skbuff: don't include <net/page_pool.h> into <linux/skbuff.h>

[Alexander Lobakin <aleksander.lobakin@intel.com>]

Currently, touching <net/page_pool.h> triggers a rebuild of more than
a half of the kernel. That's because it's included in <linux/skbuff.h>.

In 6a5bcd84e886 ("page_pool: Allow drivers to hint on SKB recycling"),
Matteo included it to be able to call a couple functions defined there.
Then, in 57f05bc2ab24 ("page_pool: keep pp info as long as page pool
owns the page") one of the calls was removed, so only one left.
It's call to page_pool_return_skb_page() in napi_frag_unref(). The
function is external and doesn't have any dependencies. Having include
of very niche page_pool.h only for that looks like an overkill.
Instead, move the declaration of that function to skbuff.h itself, with
a small comment that it's a special guest and should not be touched.
Now, after a few include fixes in the drivers, touching page_pool.h
only triggers rebuilding of the drivers using it and a couple core
networking files.

Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
---
 drivers/net/ethernet/engleder/tsnep_main.c          | 1 +
 drivers/net/ethernet/freescale/fec_main.c           | 1 +
 drivers/net/ethernet/mellanox/mlx5/core/en/params.c | 1 +
 drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c    | 1 +
 drivers/net/wireless/mediatek/mt76/mt76.h           | 1 +
 include/linux/skbuff.h                              | 4 +++-
 include/net/page_pool.h                             | 2 --
 7 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index 84751bb303a6..6222aaa5157f 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -28,6 +28,7 @@
 #include <linux/iopoll.h>
 #include <linux/bpf.h>
 #include <linux/bpf_trace.h>
+#include <net/page_pool.h>
 #include <net/xdp_sock_drv.h>
 
 #define TSNEP_RX_OFFSET (max(NET_SKB_PAD, XDP_PACKET_HEADROOM) + NET_IP_ALIGN)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 3ecf20ee5851..6ef162f8ed33 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -38,6 +38,7 @@
 #include <linux/in.h>
 #include <linux/ip.h>
 #include <net/ip.h>
+#include <net/page_pool.h>
 #include <net/selftests.h>
 #include <net/tso.h>
 #include <linux/tcp.h>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
index 9c94807097cb..3235a3a4ed08 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
@@ -6,6 +6,7 @@
 #include "en/port.h"
 #include "en_accel/en_accel.h"
 #include "en_accel/ipsec.h"
+#include <net/page_pool.h>
 #include <net/xdp_sock_drv.h>
 
 static u8 mlx5e_mpwrq_min_page_shift(struct mlx5_core_dev *mdev)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
index f0e6095809fa..1bd91bc09eb8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
@@ -35,6 +35,7 @@
 #include "en/xdp.h"
 #include "en/params.h"
 #include <linux/bitfield.h>
+#include <net/page_pool.h>
 
 int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk)
 {
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 6b07b8fafec2..95c16f11d156 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -15,6 +15,7 @@
 #include <linux/average.h>
 #include <linux/soc/mediatek/mtk_wed.h>
 #include <net/mac80211.h>
+#include <net/page_pool.h>
 #include "util.h"
 #include "testmode.h"
 
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 8cff3d817131..163d3b2d00cb 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -32,7 +32,6 @@
 #include <linux/if_packet.h>
 #include <linux/llist.h>
 #include <net/flow.h>
-#include <net/page_pool.h>
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 #include <linux/netfilter/nf_conntrack_common.h>
 #endif
@@ -3412,6 +3411,9 @@ static inline void skb_frag_ref(struct sk_buff *skb, int f)
 	__skb_frag_ref(&skb_shinfo(skb)->frags[f]);
 }
 
+/* Internal from net/core/page_pool.c, do not use in drivers directly */
+bool page_pool_return_skb_page(struct page *page, bool napi_safe);
+
 static inline void
 napi_frag_unref(skb_frag_t *frag, bool recycle, bool napi_safe)
 {
diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index c8ec2f34722b..821c75bba125 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -240,8 +240,6 @@ inline enum dma_data_direction page_pool_get_dma_dir(struct page_pool *pool)
 	return pool->p.dma_dir;
 }
 
-bool page_pool_return_skb_page(struct page *page, bool napi_safe);
-
 struct page_pool *page_pool_create(const struct page_pool_params *params);
 
 struct xdp_mem_info;
-- 
2.40.1