[PATCH net-next v6 1/2] net: move skb ref helpers to new header

From: Mina Almasry
Date: Wed Apr 10 2024 - 15:06:16 EST

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Add a new header, linux/skbuff_ref.h, which contains all the skb_*_ref()
helpers. Many of the consumers of skbuff.h do not actually use any of
the skb ref helpers, and we can speed up compilation a bit by minimizing
this header file.

Additionally in the later patch in the series we add page_pool support
to skb_frag_ref(), which requires some page_pool dependencies. We can
now add these dependencies to skbuff_ref.h instead of a very ubiquitous
skbuff.h

Signed-off-by: Mina Almasry <almasrymina@xxxxxxxxxx>

---
.../chelsio/inline_crypto/ch_ktls/chcr_ktls.c | 1 +
drivers/net/ethernet/marvell/sky2.c | 1 +
drivers/net/ethernet/mellanox/mlx4/en_rx.c | 1 +
drivers/net/ethernet/sun/cassini.c | 1 +
drivers/net/veth.c | 1 +
drivers/net/xen-netback/netback.c | 1 +
include/linux/skbuff.h | 63 ----------------
include/linux/skbuff_ref.h | 75 +++++++++++++++++++
net/core/gro.c | 1 +
net/core/skbuff.c | 1 +
net/ipv4/esp4.c | 1 +
net/ipv4/tcp_output.c | 1 +
net/ipv6/esp6.c | 1 +
net/tls/tls_device.c | 1 +
net/tls/tls_device_fallback.c | 1 +
net/tls/tls_strp.c | 1 +
16 files changed, 89 insertions(+), 63 deletions(-)
create mode 100644 include/linux/skbuff_ref.h

diff --git a/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c b/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c
index 6482728794dd..e8e460a92e0e 100644
--- a/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c
+++ b/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c
@@ -10,6 +10,7 @@
#include <net/ipv6.h>
#include <linux/netdevice.h>
#include <crypto/aes.h>
+#include <linux/skbuff_ref.h>
#include "chcr_ktls.h"

static LIST_HEAD(uld_ctx_list);
diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
index 07720841a8d7..f3f7f4cc27b3 100644
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -34,6 +34,7 @@
#include <linux/mii.h>
#include <linux/of_net.h>
#include <linux/dmi.h>
+#include <linux/skbuff_ref.h>

#include <asm/irq.h>

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index eac49657bd07..8328df8645d5 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -42,6 +42,7 @@
#include <linux/if_vlan.h>
#include <linux/vmalloc.h>
#include <linux/irq.h>
+#include <linux/skbuff_ref.h>

#include <net/ip.h>
#if IS_ENABLED(CONFIG_IPV6)
diff --git a/drivers/net/ethernet/sun/cassini.c b/drivers/net/ethernet/sun/cassini.c
index bfb903506367..8f1f43dbb76d 100644
--- a/drivers/net/ethernet/sun/cassini.c
+++ b/drivers/net/ethernet/sun/cassini.c
@@ -73,6 +73,7 @@
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
+#include <linux/skbuff_ref.h>
#include <linux/ethtool.h>
#include <linux/crc32.h>
#include <linux/random.h>
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index bcdfbf61eb66..426e68a95067 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -26,6 +26,7 @@
#include <linux/ptr_ring.h>
#include <linux/bpf_trace.h>
#include <linux/net_tstamp.h>
+#include <linux/skbuff_ref.h>
#include <net/page_pool/helpers.h>

#define DRV_NAME "veth"
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index ef76850d9bcd..48254fc07d64 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -38,6 +38,7 @@
#include <linux/if_vlan.h>
#include <linux/udp.h>
#include <linux/highmem.h>
+#include <linux/skbuff_ref.h>

#include <net/tcp.h>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 7135a3e94afd..4072a7ee3859 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3492,73 +3492,10 @@ static inline struct page *skb_frag_page(const skb_frag_t *frag)
return netmem_to_page(frag->netmem);
}

-/**
- * __skb_frag_ref - take an addition reference on a paged fragment.
- * @frag: the paged fragment
- *
- * Takes an additional reference on the paged fragment @frag.
- */
-static inline void __skb_frag_ref(skb_frag_t *frag)
-{
- get_page(skb_frag_page(frag));
-}
-
-/**
- * skb_frag_ref - take an addition reference on a paged fragment of an skb.
- * @skb: the buffer
- * @f: the fragment offset.
- *
- * Takes an additional reference on the @f'th paged fragment of @skb.
- */
-static inline void skb_frag_ref(struct sk_buff *skb, int f)
-{
- __skb_frag_ref(&skb_shinfo(skb)->frags[f]);
-}
-
int skb_pp_cow_data(struct page_pool *pool, struct sk_buff **pskb,
unsigned int headroom);
int skb_cow_data_for_xdp(struct page_pool *pool, struct sk_buff **pskb,
struct bpf_prog *prog);
-bool napi_pp_put_page(struct page *page);
-
-static inline void
-skb_page_unref(struct page *page, bool recycle)
-{
-#ifdef CONFIG_PAGE_POOL
- if (recycle && napi_pp_put_page(page))
- return;
-#endif
- put_page(page);
-}
-
-/**
- * __skb_frag_unref - release a reference on a paged fragment.
- * @frag: the paged fragment
- * @recycle: recycle the page if allocated via page_pool
- *
- * Releases a reference on the paged fragment @frag
- * or recycles the page via the page_pool API.
- */
-static inline void __skb_frag_unref(skb_frag_t *frag, bool recycle)
-{
- skb_page_unref(skb_frag_page(frag), recycle);
-}
-
-/**
- * skb_frag_unref - release a reference on a paged fragment of an skb.
- * @skb: the buffer
- * @f: the fragment offset
- *
- * Releases a reference on the @f'th paged fragment of @skb.
- */
-static inline void skb_frag_unref(struct sk_buff *skb, int f)
-{
- struct skb_shared_info *shinfo = skb_shinfo(skb);
-
- if (!skb_zcopy_managed(skb))
- __skb_frag_unref(&shinfo->frags[f], skb->pp_recycle);
-}
-
/**
* skb_frag_address - gets the address of the data contained in a paged fragment
* @frag: the paged fragment buffer
diff --git a/include/linux/skbuff_ref.h b/include/linux/skbuff_ref.h
new file mode 100644
index 000000000000..11f0a4063403
--- /dev/null
+++ b/include/linux/skbuff_ref.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Skb ref helpers.
+ *
+ */
+
+#ifndef _LINUX_SKBUFF_REF_H
+#define _LINUX_SKBUFF_REF_H
+
+#include <linux/skbuff.h>
+
+/**
+ * __skb_frag_ref - take an addition reference on a paged fragment.
+ * @frag: the paged fragment
+ *
+ * Takes an additional reference on the paged fragment @frag.
+ */
+static inline void __skb_frag_ref(skb_frag_t *frag)
+{
+ get_page(skb_frag_page(frag));
+}
+
+/**
+ * skb_frag_ref - take an addition reference on a paged fragment of an skb.
+ * @skb: the buffer
+ * @f: the fragment offset.
+ *
+ * Takes an additional reference on the @f'th paged fragment of @skb.
+ */
+static inline void skb_frag_ref(struct sk_buff *skb, int f)
+{
+ __skb_frag_ref(&skb_shinfo(skb)->frags[f]);
+}
+
+bool napi_pp_put_page(struct page *page);
+
+static inline void
+skb_page_unref(struct page *page, bool recycle)
+{
+#ifdef CONFIG_PAGE_POOL
+ if (recycle && napi_pp_put_page(page))
+ return;
+#endif
+ put_page(page);
+}
+
+/**
+ * __skb_frag_unref - release a reference on a paged fragment.
+ * @frag: the paged fragment
+ * @recycle: recycle the page if allocated via page_pool
+ *
+ * Releases a reference on the paged fragment @frag
+ * or recycles the page via the page_pool API.
+ */
+static inline void __skb_frag_unref(skb_frag_t *frag, bool recycle)
+{
+ skb_page_unref(skb_frag_page(frag), recycle);
+}
+
+/**
+ * skb_frag_unref - release a reference on a paged fragment of an skb.
+ * @skb: the buffer
+ * @f: the fragment offset
+ *
+ * Releases a reference on the @f'th paged fragment of @skb.
+ */
+static inline void skb_frag_unref(struct sk_buff *skb, int f)
+{
+ struct skb_shared_info *shinfo = skb_shinfo(skb);
+
+ if (!skb_zcopy_managed(skb))
+ __skb_frag_unref(&shinfo->frags[f], skb->pp_recycle);
+}
+
+#endif /* _LINUX_SKBUFF_REF_H */
diff --git a/net/core/gro.c b/net/core/gro.c
index 83f35d99a682..2459ab697f7f 100644
--- a/net/core/gro.c
+++ b/net/core/gro.c
@@ -3,6 +3,7 @@
#include <net/dst_metadata.h>
#include <net/busy_poll.h>
#include <trace/events/net.h>
+#include <linux/skbuff_ref.h>

#define MAX_GRO_SKBS 8

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 888874ef8566..38c09a70adc1 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -51,6 +51,7 @@
#endif
#include <linux/string.h>
#include <linux/skbuff.h>
+#include <linux/skbuff_ref.h>
#include <linux/splice.h>
#include <linux/cache.h>
#include <linux/rtnetlink.h>
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 40330253f076..dff04580318f 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -20,6 +20,7 @@
#include <net/udp.h>
#include <net/tcp.h>
#include <net/espintcp.h>
+#include <linux/skbuff_ref.h>

#include <linux/highmem.h>

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 9282fafc0e61..61119d42b0fd 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -44,6 +44,7 @@
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/static_key.h>
+#include <linux/skbuff_ref.h>

#include <trace/events/tcp.h>

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index fb431d0a3475..6bc0a84c8d05 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -36,6 +36,7 @@
#include <net/tcp.h>
#include <net/espintcp.h>
#include <net/inet6_hashtables.h>
+#include <linux/skbuff_ref.h>

#include <linux/highmem.h>

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index bf8ed36b1ad6..ab6e694f7bc2 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -37,6 +37,7 @@
#include <net/inet_connection_sock.h>
#include <net/tcp.h>
#include <net/tls.h>
+#include <linux/skbuff_ref.h>

#include "tls.h"
#include "trace.h"
diff --git a/net/tls/tls_device_fallback.c b/net/tls/tls_device_fallback.c
index 4e7228f275fa..f9e3d3d90dcf 100644
--- a/net/tls/tls_device_fallback.c
+++ b/net/tls/tls_device_fallback.c
@@ -33,6 +33,7 @@
#include <crypto/aead.h>
#include <crypto/scatterwalk.h>
#include <net/ip6_checksum.h>
+#include <linux/skbuff_ref.h>

#include "tls.h"

diff --git a/net/tls/tls_strp.c b/net/tls/tls_strp.c
index ca1e0e198ceb..58c4b06f4f0c 100644
--- a/net/tls/tls_strp.c
+++ b/net/tls/tls_strp.c
@@ -2,6 +2,7 @@
/* Copyright (c) 2016 Tom Herbert <tom@xxxxxxxxxxxxxxx> */

#include <linux/skbuff.h>
+#include <linux/skbuff_ref.h>
#include <linux/workqueue.h>
#include <net/strparser.h>
#include <net/tcp.h>
--
2.44.0.478.gd926399ef9-goog

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