[PATCH net-next v25 05/13] page_pool: devmem support

From: Mina Almasry
Date: Mon Sep 09 2024 - 01:48:14 EST

Convert netmem to be a union of struct page and struct netmem. Overload
the LSB of struct netmem* to indicate that it's a net_iov, otherwise
it's a page.

Currently these entries in struct page are rented by the page_pool and
used exclusively by the net stack:

struct {
unsigned long pp_magic;
struct page_pool *pp;
unsigned long _pp_mapping_pad;
unsigned long dma_addr;
atomic_long_t pp_ref_count;
};

Mirror these (and only these) entries into struct net_iov and implement
netmem helpers that can access these common fields regardless of
whether the underlying type is page or net_iov.

Implement checks for net_iov in netmem helpers which delegate to mm
APIs, to ensure net_iov are never passed to the mm stack.

Signed-off-by: Mina Almasry <almasrymina@xxxxxxxxxx>
Reviewed-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Acked-by: Jakub Kicinski <kuba@xxxxxxxxxx>

---

v23:
- Fix comment on netmem_is_perf_nid (Jakub)

v19:
- Move page_pool_set_dma_addr(_netmem) to page_pool_priv.h
- Don't reset niov dma_addr on allocation/free. Instead, it's set once
when the binding happens and it never changes (Jakub)

v17:
- Rename netmem_to_pfn to netmem_pfn_trace (Jakub)
- Move some low level netmem helpers to netmem_priv.h (Jakub).

v13:
- Move NET_IOV dependent changes to this patch.
- Fixed comment (Pavel)
- Applied Reviewed-by from Pavel.

v9: https://lore.kernel.org/netdev/20240403002053.2376017-8-almasrymina@xxxxxxxxxx/
- Remove CONFIG checks in netmem_is_net_iov() (Pavel/David/Jens)

v7:
- Remove static_branch_unlikely from netmem_to_net_iov(). We're getting
better results from the fast path in bench_page_pool_simple tests
without the static_branch_unlikely, and the addition of
static_branch_unlikely doesn't improve performance of devmem TCP.

Additionally only check netmem_to_net_iov() if
CONFIG_DMA_SHARED_BUFFER is enabled, otherwise dmabuf net_iovs cannot
exist anyway.

net-next base: 8 cycle fast path.
with static_branch_unlikely: 10 cycle fast path.
without static_branch_unlikely: 9 cycle fast path.
CONFIG_DMA_SHARED_BUFFER disabled: 8 cycle fast path as baseline.

Performance of devmem TCP is at 95% line rate is regardless of
static_branch_unlikely or not.

v6:
- Rebased on top of the merged netmem_ref type.
- Rebased on top of the merged skb_pp_frag_ref() changes.

v5:
- Use netmem instead of page* with LSB set.
- Use pp_ref_count for refcounting net_iov.
- Removed many of the custom checks for netmem.

v1:
- Disable fragmentation support for iov properly.
- fix napi_pp_put_page() path (Yunsheng).
- Use pp_frag_count for devmem refcounting.

Cc: linux-mm@xxxxxxxxx
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>

---
include/net/netmem.h | 123 +++++++++++++++++++++++++++++--
include/net/page_pool/helpers.h | 39 ++--------
include/trace/events/page_pool.h | 12 +--
net/core/devmem.c | 7 ++
net/core/netmem_priv.h | 31 ++++++++
net/core/page_pool.c | 25 ++++---
net/core/page_pool_priv.h | 26 +++++++
net/core/skbuff.c | 23 +++---
8 files changed, 217 insertions(+), 69 deletions(-)
create mode 100644 net/core/netmem_priv.h

diff --git a/include/net/netmem.h b/include/net/netmem.h
index c23e224dd6a0..5eccc40df92d 100644
--- a/include/net/netmem.h
+++ b/include/net/netmem.h
@@ -8,12 +8,51 @@
#ifndef _NET_NETMEM_H
#define _NET_NETMEM_H

+#include <net/net_debug.h>
+
/* net_iov */

+DECLARE_STATIC_KEY_FALSE(page_pool_mem_providers);
+
+/* We overload the LSB of the struct page pointer to indicate whether it's
+ * a page or net_iov.
+ */
+#define NET_IOV 0x01UL
+
struct net_iov {
+ unsigned long __unused_padding;
+ unsigned long pp_magic;
+ struct page_pool *pp;
struct dmabuf_genpool_chunk_owner *owner;
+ unsigned long dma_addr;
+ atomic_long_t pp_ref_count;
};

+/* These fields in struct page are used by the page_pool and net stack:
+ *
+ * struct {
+ * unsigned long pp_magic;
+ * struct page_pool *pp;
+ * unsigned long _pp_mapping_pad;
+ * unsigned long dma_addr;
+ * atomic_long_t pp_ref_count;
+ * };
+ *
+ * We mirror the page_pool fields here so the page_pool can access these fields
+ * without worrying whether the underlying fields belong to a page or net_iov.
+ *
+ * The non-net stack fields of struct page are private to the mm stack and must
+ * never be mirrored to net_iov.
+ */
+#define NET_IOV_ASSERT_OFFSET(pg, iov) \
+ static_assert(offsetof(struct page, pg) == \
+ offsetof(struct net_iov, iov))
+NET_IOV_ASSERT_OFFSET(pp_magic, pp_magic);
+NET_IOV_ASSERT_OFFSET(pp, pp);
+NET_IOV_ASSERT_OFFSET(dma_addr, dma_addr);
+NET_IOV_ASSERT_OFFSET(pp_ref_count, pp_ref_count);
+#undef NET_IOV_ASSERT_OFFSET
+
/* netmem */

/**
@@ -27,20 +66,37 @@ struct net_iov {
*/
typedef unsigned long __bitwise netmem_ref;

+static inline bool netmem_is_net_iov(const netmem_ref netmem)
+{
+ return (__force unsigned long)netmem & NET_IOV;
+}
+
/* This conversion fails (returns NULL) if the netmem_ref is not struct page
* backed.
- *
- * Currently struct page is the only possible netmem, and this helper never
- * fails.
*/
static inline struct page *netmem_to_page(netmem_ref netmem)
{
+ if (WARN_ON_ONCE(netmem_is_net_iov(netmem)))
+ return NULL;
+
return (__force struct page *)netmem;
}

-/* Converting from page to netmem is always safe, because a page can always be
- * a netmem.
- */
+static inline struct net_iov *netmem_to_net_iov(netmem_ref netmem)
+{
+ if (netmem_is_net_iov(netmem))
+ return (struct net_iov *)((__force unsigned long)netmem &
+ ~NET_IOV);
+
+ DEBUG_NET_WARN_ON_ONCE(true);
+ return NULL;
+}
+
+static inline netmem_ref net_iov_to_netmem(struct net_iov *niov)
+{
+ return (__force netmem_ref)((unsigned long)niov | NET_IOV);
+}
+
static inline netmem_ref page_to_netmem(struct page *page)
{
return (__force netmem_ref)page;
@@ -48,17 +104,70 @@ static inline netmem_ref page_to_netmem(struct page *page)

static inline int netmem_ref_count(netmem_ref netmem)
{
+ /* The non-pp refcount of net_iov is always 1. On net_iov, we only
+ * support pp refcounting which uses the pp_ref_count field.
+ */
+ if (netmem_is_net_iov(netmem))
+ return 1;
+
return page_ref_count(netmem_to_page(netmem));
}

-static inline unsigned long netmem_to_pfn(netmem_ref netmem)
+static inline unsigned long netmem_pfn_trace(netmem_ref netmem)
{
+ if (netmem_is_net_iov(netmem))
+ return 0;
+
return page_to_pfn(netmem_to_page(netmem));
}

+static inline struct net_iov *__netmem_clear_lsb(netmem_ref netmem)
+{
+ return (struct net_iov *)((__force unsigned long)netmem & ~NET_IOV);
+}
+
+static inline struct page_pool *netmem_get_pp(netmem_ref netmem)
+{
+ return __netmem_clear_lsb(netmem)->pp;
+}
+
+static inline atomic_long_t *netmem_get_pp_ref_count_ref(netmem_ref netmem)
+{
+ return &__netmem_clear_lsb(netmem)->pp_ref_count;
+}
+
+static inline bool netmem_is_pref_nid(netmem_ref netmem, int pref_nid)
+{
+ /* NUMA node preference only makes sense if we're allocating
+ * system memory. Memory providers (which give us net_iovs)
+ * choose for us.
+ */
+ if (netmem_is_net_iov(netmem))
+ return true;
+
+ return page_to_nid(netmem_to_page(netmem)) == pref_nid;
+}
+
static inline netmem_ref netmem_compound_head(netmem_ref netmem)
{
+ /* niov are never compounded */
+ if (netmem_is_net_iov(netmem))
+ return netmem;
+
return page_to_netmem(compound_head(netmem_to_page(netmem)));
}

+static inline void *netmem_address(netmem_ref netmem)
+{
+ if (netmem_is_net_iov(netmem))
+ return NULL;
+
+ return page_address(netmem_to_page(netmem));
+}
+
+static inline unsigned long netmem_get_dma_addr(netmem_ref netmem)
+{
+ return __netmem_clear_lsb(netmem)->dma_addr;
+}
+
#endif /* _NET_NETMEM_H */
diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h
index 2b43a893c619..793e6fd78bc5 100644
--- a/include/net/page_pool/helpers.h
+++ b/include/net/page_pool/helpers.h
@@ -216,7 +216,7 @@ page_pool_get_dma_dir(const struct page_pool *pool)

static inline void page_pool_fragment_netmem(netmem_ref netmem, long nr)
{
- atomic_long_set(&netmem_to_page(netmem)->pp_ref_count, nr);
+ atomic_long_set(netmem_get_pp_ref_count_ref(netmem), nr);
}

/**
@@ -244,7 +244,7 @@ static inline void page_pool_fragment_page(struct page *page, long nr)

static inline long page_pool_unref_netmem(netmem_ref netmem, long nr)
{
- struct page *page = netmem_to_page(netmem);
+ atomic_long_t *pp_ref_count = netmem_get_pp_ref_count_ref(netmem);
long ret;

/* If nr == pp_ref_count then we have cleared all remaining
@@ -261,19 +261,19 @@ static inline long page_pool_unref_netmem(netmem_ref netmem, long nr)
* initially, and only overwrite it when the page is partitioned into
* more than one piece.
*/
- if (atomic_long_read(&page->pp_ref_count) == nr) {
+ if (atomic_long_read(pp_ref_count) == nr) {
/* As we have ensured nr is always one for constant case using
* the BUILD_BUG_ON(), only need to handle the non-constant case
* here for pp_ref_count draining, which is a rare case.
*/
BUILD_BUG_ON(__builtin_constant_p(nr) && nr != 1);
if (!__builtin_constant_p(nr))
- atomic_long_set(&page->pp_ref_count, 1);
+ atomic_long_set(pp_ref_count, 1);

return 0;
}

- ret = atomic_long_sub_return(nr, &page->pp_ref_count);
+ ret = atomic_long_sub_return(nr, pp_ref_count);
WARN_ON(ret < 0);

/* We are the last user here too, reset pp_ref_count back to 1 to
@@ -282,7 +282,7 @@ static inline long page_pool_unref_netmem(netmem_ref netmem, long nr)
* page_pool_unref_page() currently.
*/
if (unlikely(!ret))
- atomic_long_set(&page->pp_ref_count, 1);
+ atomic_long_set(pp_ref_count, 1);

return ret;
}
@@ -401,9 +401,7 @@ static inline void page_pool_free_va(struct page_pool *pool, void *va,

static inline dma_addr_t page_pool_get_dma_addr_netmem(netmem_ref netmem)
{
- struct page *page = netmem_to_page(netmem);
-
- dma_addr_t ret = page->dma_addr;
+ dma_addr_t ret = netmem_get_dma_addr(netmem);

if (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA)
ret <<= PAGE_SHIFT;
@@ -423,24 +421,6 @@ static inline dma_addr_t page_pool_get_dma_addr(const struct page *page)
return page_pool_get_dma_addr_netmem(page_to_netmem((struct page *)page));
}

-static inline bool page_pool_set_dma_addr_netmem(netmem_ref netmem,
- dma_addr_t addr)
-{
- struct page *page = netmem_to_page(netmem);
-
- if (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA) {
- page->dma_addr = addr >> PAGE_SHIFT;
-
- /* We assume page alignment to shave off bottom bits,
- * if this "compression" doesn't work we need to drop.
- */
- return addr != (dma_addr_t)page->dma_addr << PAGE_SHIFT;
- }
-
- page->dma_addr = addr;
- return false;
-}
-
/**
* page_pool_dma_sync_for_cpu - sync Rx page for CPU after it's written by HW
* @pool: &page_pool the @page belongs to
@@ -463,11 +443,6 @@ static inline void page_pool_dma_sync_for_cpu(const struct page_pool *pool,
page_pool_get_dma_dir(pool));
}

-static inline bool page_pool_set_dma_addr(struct page *page, dma_addr_t addr)
-{
- return page_pool_set_dma_addr_netmem(page_to_netmem(page), addr);
-}
-
static inline bool page_pool_put(struct page_pool *pool)
{
return refcount_dec_and_test(&pool->user_cnt);
diff --git a/include/trace/events/page_pool.h b/include/trace/events/page_pool.h
index 543e54e432a1..31825ed30032 100644
--- a/include/trace/events/page_pool.h
+++ b/include/trace/events/page_pool.h
@@ -57,12 +57,12 @@ TRACE_EVENT(page_pool_state_release,
__entry->pool = pool;
__entry->netmem = (__force unsigned long)netmem;
__entry->release = release;
- __entry->pfn = netmem_to_pfn(netmem);
+ __entry->pfn = netmem_pfn_trace(netmem);
),

- TP_printk("page_pool=%p netmem=%p pfn=0x%lx release=%u",
+ TP_printk("page_pool=%p netmem=%p is_net_iov=%lu pfn=0x%lx release=%u",
__entry->pool, (void *)__entry->netmem,
- __entry->pfn, __entry->release)
+ __entry->netmem & NET_IOV, __entry->pfn, __entry->release)
);

TRACE_EVENT(page_pool_state_hold,
@@ -83,12 +83,12 @@ TRACE_EVENT(page_pool_state_hold,
__entry->pool = pool;
__entry->netmem = (__force unsigned long)netmem;
__entry->hold = hold;
- __entry->pfn = netmem_to_pfn(netmem);
+ __entry->pfn = netmem_pfn_trace(netmem);
),

- TP_printk("page_pool=%p netmem=%p pfn=0x%lx hold=%u",
+ TP_printk("page_pool=%p netmem=%p is_net_iov=%lu, pfn=0x%lx hold=%u",
__entry->pool, (void *)__entry->netmem,
- __entry->pfn, __entry->hold)
+ __entry->netmem & NET_IOV, __entry->pfn, __entry->hold)
);

TRACE_EVENT(page_pool_update_nid,
diff --git a/net/core/devmem.c b/net/core/devmem.c
index 9beb03763dc9..7efeb602cf45 100644
--- a/net/core/devmem.c
+++ b/net/core/devmem.c
@@ -18,6 +18,7 @@
#include <trace/events/page_pool.h>

#include "devmem.h"
+#include "page_pool_priv.h"

/* Device memory support */

@@ -82,6 +83,10 @@ net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding)
index = offset / PAGE_SIZE;
niov = &owner->niovs[index];

+ niov->pp_magic = 0;
+ niov->pp = NULL;
+ atomic_long_set(&niov->pp_ref_count, 0);
+
return niov;
}

@@ -269,6 +274,8 @@ net_devmem_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd,
for (i = 0; i < owner->num_niovs; i++) {
niov = &owner->niovs[i];
niov->owner = owner;
+ page_pool_set_dma_addr_netmem(net_iov_to_netmem(niov),
+ net_devmem_get_dma_addr(niov));
}

virtual += len;
diff --git a/net/core/netmem_priv.h b/net/core/netmem_priv.h
new file mode 100644
index 000000000000..7eadb8393e00
--- /dev/null
+++ b/net/core/netmem_priv.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __NETMEM_PRIV_H
+#define __NETMEM_PRIV_H
+
+static inline unsigned long netmem_get_pp_magic(netmem_ref netmem)
+{
+ return __netmem_clear_lsb(netmem)->pp_magic;
+}
+
+static inline void netmem_or_pp_magic(netmem_ref netmem, unsigned long pp_magic)
+{
+ __netmem_clear_lsb(netmem)->pp_magic |= pp_magic;
+}
+
+static inline void netmem_clear_pp_magic(netmem_ref netmem)
+{
+ __netmem_clear_lsb(netmem)->pp_magic = 0;
+}
+
+static inline void netmem_set_pp(netmem_ref netmem, struct page_pool *pool)
+{
+ __netmem_clear_lsb(netmem)->pp = pool;
+}
+
+static inline void netmem_set_dma_addr(netmem_ref netmem,
+ unsigned long dma_addr)
+{
+ __netmem_clear_lsb(netmem)->dma_addr = dma_addr;
+}
+#endif
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 2abe6e919224..52659db2d765 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -24,8 +24,11 @@

#include <trace/events/page_pool.h>

+#include "netmem_priv.h"
#include "page_pool_priv.h"

+DEFINE_STATIC_KEY_FALSE(page_pool_mem_providers);
+
#define DEFER_TIME (msecs_to_jiffies(1000))
#define DEFER_WARN_INTERVAL (60 * HZ)

@@ -358,7 +361,7 @@ static noinline netmem_ref page_pool_refill_alloc_cache(struct page_pool *pool)
if (unlikely(!netmem))
break;

- if (likely(page_to_nid(netmem_to_page(netmem)) == pref_nid)) {
+ if (likely(netmem_is_pref_nid(netmem, pref_nid))) {
pool->alloc.cache[pool->alloc.count++] = netmem;
} else {
/* NUMA mismatch;
@@ -454,10 +457,8 @@ static bool page_pool_dma_map(struct page_pool *pool, netmem_ref netmem)

static void page_pool_set_pp_info(struct page_pool *pool, netmem_ref netmem)
{
- struct page *page = netmem_to_page(netmem);
-
- page->pp = pool;
- page->pp_magic |= PP_SIGNATURE;
+ netmem_set_pp(netmem, pool);
+ netmem_or_pp_magic(netmem, PP_SIGNATURE);

/* Ensuring all pages have been split into one fragment initially:
* page_pool_set_pp_info() is only called once for every page when it
@@ -472,10 +473,8 @@ static void page_pool_set_pp_info(struct page_pool *pool, netmem_ref netmem)

static void page_pool_clear_pp_info(netmem_ref netmem)
{
- struct page *page = netmem_to_page(netmem);
-
- page->pp_magic = 0;
- page->pp = NULL;
+ netmem_clear_pp_magic(netmem);
+ netmem_set_pp(netmem, NULL);
}

static struct page *__page_pool_alloc_page_order(struct page_pool *pool,
@@ -692,8 +691,9 @@ static bool page_pool_recycle_in_cache(netmem_ref netmem,

static bool __page_pool_page_can_be_recycled(netmem_ref netmem)
{
- return page_ref_count(netmem_to_page(netmem)) == 1 &&
- !page_is_pfmemalloc(netmem_to_page(netmem));
+ return netmem_is_net_iov(netmem) ||
+ (page_ref_count(netmem_to_page(netmem)) == 1 &&
+ !page_is_pfmemalloc(netmem_to_page(netmem)));
}

/* If the page refcnt == 1, this will try to recycle the page.
@@ -728,6 +728,7 @@ __page_pool_put_page(struct page_pool *pool, netmem_ref netmem,
/* Page found as candidate for recycling */
return netmem;
}
+
/* Fallback/non-XDP mode: API user have elevated refcnt.
*
* Many drivers split up the page into fragments, and some
@@ -949,7 +950,7 @@ static void page_pool_empty_ring(struct page_pool *pool)
/* Empty recycle ring */
while ((netmem = (__force netmem_ref)ptr_ring_consume_bh(&pool->ring))) {
/* Verify the refcnt invariant of cached pages */
- if (!(page_ref_count(netmem_to_page(netmem)) == 1))
+ if (!(netmem_ref_count(netmem) == 1))
pr_crit("%s() page_pool refcnt %d violation\n",
__func__, netmem_ref_count(netmem));

diff --git a/net/core/page_pool_priv.h b/net/core/page_pool_priv.h
index 90665d40f1eb..d602c1e728c2 100644
--- a/net/core/page_pool_priv.h
+++ b/net/core/page_pool_priv.h
@@ -3,10 +3,36 @@
#ifndef __PAGE_POOL_PRIV_H
#define __PAGE_POOL_PRIV_H

+#include <net/page_pool/helpers.h>
+
+#include "netmem_priv.h"
+
s32 page_pool_inflight(const struct page_pool *pool, bool strict);

int page_pool_list(struct page_pool *pool);
void page_pool_detached(struct page_pool *pool);
void page_pool_unlist(struct page_pool *pool);

+static inline bool
+page_pool_set_dma_addr_netmem(netmem_ref netmem, dma_addr_t addr)
+{
+ if (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA) {
+ netmem_set_dma_addr(netmem, addr >> PAGE_SHIFT);
+
+ /* We assume page alignment to shave off bottom bits,
+ * if this "compression" doesn't work we need to drop.
+ */
+ return addr != (dma_addr_t)netmem_get_dma_addr(netmem)
+ << PAGE_SHIFT;
+ }
+
+ netmem_set_dma_addr(netmem, addr);
+ return false;
+}
+
+static inline bool page_pool_set_dma_addr(struct page *page, dma_addr_t addr)
+{
+ return page_pool_set_dma_addr_netmem(page_to_netmem(page), addr);
+}
+
#endif
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index a52638363ea5..d9634ab342cc 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -88,6 +88,7 @@
#include <linux/textsearch.h>

#include "dev.h"
+#include "netmem_priv.h"
#include "sock_destructor.h"

#ifdef CONFIG_SKB_EXTENSIONS
@@ -920,9 +921,9 @@ static void skb_clone_fraglist(struct sk_buff *skb)
skb_get(list);
}

-static bool is_pp_page(struct page *page)
+static bool is_pp_netmem(netmem_ref netmem)
{
- return (page->pp_magic & ~0x3UL) == PP_SIGNATURE;
+ return (netmem_get_pp_magic(netmem) & ~0x3UL) == PP_SIGNATURE;
}

int skb_pp_cow_data(struct page_pool *pool, struct sk_buff **pskb,
@@ -1020,9 +1021,7 @@ EXPORT_SYMBOL(skb_cow_data_for_xdp);
#if IS_ENABLED(CONFIG_PAGE_POOL)
bool napi_pp_put_page(netmem_ref netmem)
{
- struct page *page = netmem_to_page(netmem);
-
- page = compound_head(page);
+ netmem = netmem_compound_head(netmem);

/* page->pp_magic is OR'ed with PP_SIGNATURE after the allocation
* in order to preserve any existing bits, such as bit 0 for the
@@ -1031,10 +1030,10 @@ bool napi_pp_put_page(netmem_ref netmem)
* and page_is_pfmemalloc() is checked in __page_pool_put_page()
* to avoid recycling the pfmemalloc page.
*/
- if (unlikely(!is_pp_page(page)))
+ if (unlikely(!is_pp_netmem(netmem)))
return false;

- page_pool_put_full_netmem(page->pp, page_to_netmem(page), false);
+ page_pool_put_full_netmem(netmem_get_pp(netmem), netmem, false);

return true;
}
@@ -1061,7 +1060,7 @@ static bool skb_pp_recycle(struct sk_buff *skb, void *data)
static int skb_pp_frag_ref(struct sk_buff *skb)
{
struct skb_shared_info *shinfo;
- struct page *head_page;
+ netmem_ref head_netmem;
int i;

if (!skb->pp_recycle)
@@ -1070,11 +1069,11 @@ static int skb_pp_frag_ref(struct sk_buff *skb)
shinfo = skb_shinfo(skb);

for (i = 0; i < shinfo->nr_frags; i++) {
- head_page = compound_head(skb_frag_page(&shinfo->frags[i]));
- if (likely(is_pp_page(head_page)))
- page_pool_ref_page(head_page);
+ head_netmem = netmem_compound_head(shinfo->frags[i].netmem);
+ if (likely(is_pp_netmem(head_netmem)))
+ page_pool_ref_netmem(head_netmem);
else
- page_ref_inc(head_page);
+ page_ref_inc(netmem_to_page(head_netmem));
}
return 0;
}
--
2.46.0.469.g59c65b2a67-goog