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Message-ID: <20241203173733.3181246-9-aleksander.lobakin@intel.com>
Date: Tue, 3 Dec 2024 18:37:31 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
John Fastabend <john.fastabend@...il.com>,
Andrii Nakryiko <andrii@...nel.org>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Toke Høiland-Jørgensen <toke@...hat.com>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
Stanislav Fomichev <sdf@...ichev.me>,
Magnus Karlsson <magnus.karlsson@...el.com>,
nex.sw.ncis.osdt.itp.upstreaming@...el.com,
bpf@...r.kernel.org,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH net-next v6 08/10] page_pool: make page_pool_put_page_bulk() handle array of netmems
Currently, page_pool_put_page_bulk() indeed takes an array of pointers
to the data, not pages, despite the name. As one side effect, when
you're freeing frags from &skb_shared_info, xdp_return_frame_bulk()
converts page pointers to virtual addresses and then
page_pool_put_page_bulk() converts them back. Moreover, data pointers
assume every frag is placed in the host memory, making this function
non-universal.
Make page_pool_put_page_bulk() handle array of netmems. Pass frag
netmems directly and use virt_to_netmem() when freeing xdpf->data,
so that the PP core will then get the compound netmem and take care
of the rest.
Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
include/net/page_pool/types.h | 8 ++++----
include/net/xdp.h | 2 +-
net/core/page_pool.c | 30 +++++++++++++++---------------
net/core/xdp.c | 6 +++---
4 files changed, 23 insertions(+), 23 deletions(-)
diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
index c022c410abe3..1ea16b0e9c79 100644
--- a/include/net/page_pool/types.h
+++ b/include/net/page_pool/types.h
@@ -259,8 +259,8 @@ void page_pool_disable_direct_recycling(struct page_pool *pool);
void page_pool_destroy(struct page_pool *pool);
void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *),
const struct xdp_mem_info *mem);
-void page_pool_put_page_bulk(struct page_pool *pool, void **data,
- int count);
+void page_pool_put_netmem_bulk(struct page_pool *pool, netmem_ref *data,
+ u32 count);
#else
static inline void page_pool_destroy(struct page_pool *pool)
{
@@ -272,8 +272,8 @@ static inline void page_pool_use_xdp_mem(struct page_pool *pool,
{
}
-static inline void page_pool_put_page_bulk(struct page_pool *pool, void **data,
- int count)
+static inline void page_pool_put_netmem_bulk(struct page_pool *pool,
+ netmem_ref *data, u32 count)
{
}
#endif
diff --git a/include/net/xdp.h b/include/net/xdp.h
index 1253fe21ede7..f4020b29122f 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -194,7 +194,7 @@ xdp_frame_is_frag_pfmemalloc(const struct xdp_frame *frame)
struct xdp_frame_bulk {
int count;
void *xa;
- void *q[XDP_BULK_QUEUE_SIZE];
+ netmem_ref q[XDP_BULK_QUEUE_SIZE];
};
static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq)
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index f89cf93f6eb4..4c85b77cfdac 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -840,22 +840,22 @@ void page_pool_put_unrefed_page(struct page_pool *pool, struct page *page,
EXPORT_SYMBOL(page_pool_put_unrefed_page);
/**
- * page_pool_put_page_bulk() - release references on multiple pages
+ * page_pool_put_netmem_bulk() - release references on multiple netmems
* @pool: pool from which pages were allocated
- * @data: array holding page pointers
- * @count: number of pages in @data
+ * @data: array holding netmem references
+ * @count: number of entries in @data
*
- * Tries to refill a number of pages into the ptr_ring cache holding ptr_ring
- * producer lock. If the ptr_ring is full, page_pool_put_page_bulk()
- * will release leftover pages to the page allocator.
- * page_pool_put_page_bulk() is suitable to be run inside the driver NAPI tx
+ * Tries to refill a number of netmems into the ptr_ring cache holding ptr_ring
+ * producer lock. If the ptr_ring is full, page_pool_put_netmem_bulk()
+ * will release leftover netmems to the memory provider.
+ * page_pool_put_netmem_bulk() is suitable to be run inside the driver NAPI tx
* completion loop for the XDP_REDIRECT use case.
*
* Please note the caller must not use data area after running
- * page_pool_put_page_bulk(), as this function overwrites it.
+ * page_pool_put_netmem_bulk(), as this function overwrites it.
*/
-void page_pool_put_page_bulk(struct page_pool *pool, void **data,
- int count)
+void page_pool_put_netmem_bulk(struct page_pool *pool, netmem_ref *data,
+ u32 count)
{
int i, bulk_len = 0;
bool allow_direct;
@@ -864,7 +864,7 @@ void page_pool_put_page_bulk(struct page_pool *pool, void **data,
allow_direct = page_pool_napi_local(pool);
for (i = 0; i < count; i++) {
- netmem_ref netmem = page_to_netmem(virt_to_head_page(data[i]));
+ netmem_ref netmem = netmem_compound_head(data[i]);
/* It is not the last user for the page frag case */
if (!page_pool_is_last_ref(netmem))
@@ -873,7 +873,7 @@ void page_pool_put_page_bulk(struct page_pool *pool, void **data,
netmem = __page_pool_put_page(pool, netmem, -1, allow_direct);
/* Approved for bulk recycling in ptr_ring cache */
if (netmem)
- data[bulk_len++] = (__force void *)netmem;
+ data[bulk_len++] = netmem;
}
if (!bulk_len)
@@ -882,7 +882,7 @@ void page_pool_put_page_bulk(struct page_pool *pool, void **data,
/* Bulk producer into ptr_ring page_pool cache */
in_softirq = page_pool_producer_lock(pool);
for (i = 0; i < bulk_len; i++) {
- if (__ptr_ring_produce(&pool->ring, data[i])) {
+ if (__ptr_ring_produce(&pool->ring, (__force void *)data[i])) {
/* ring full */
recycle_stat_inc(pool, ring_full);
break;
@@ -899,9 +899,9 @@ void page_pool_put_page_bulk(struct page_pool *pool, void **data,
* since put_page() with refcnt == 1 can be an expensive operation
*/
for (; i < bulk_len; i++)
- page_pool_return_page(pool, (__force netmem_ref)data[i]);
+ page_pool_return_page(pool, data[i]);
}
-EXPORT_SYMBOL(page_pool_put_page_bulk);
+EXPORT_SYMBOL(page_pool_put_netmem_bulk);
static netmem_ref page_pool_drain_frag(struct page_pool *pool,
netmem_ref netmem)
diff --git a/net/core/xdp.c b/net/core/xdp.c
index de1e9cb78718..938ad15c9857 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -518,7 +518,7 @@ void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq)
if (unlikely(!xa || !bq->count))
return;
- page_pool_put_page_bulk(xa->page_pool, bq->q, bq->count);
+ page_pool_put_netmem_bulk(xa->page_pool, bq->q, bq->count);
/* bq->xa is not cleared to save lookup, if mem.id same in next bulk */
bq->count = 0;
}
@@ -559,12 +559,12 @@ void xdp_return_frame_bulk(struct xdp_frame *xdpf,
for (i = 0; i < sinfo->nr_frags; i++) {
skb_frag_t *frag = &sinfo->frags[i];
- bq->q[bq->count++] = skb_frag_address(frag);
+ bq->q[bq->count++] = skb_frag_netmem(frag);
if (bq->count == XDP_BULK_QUEUE_SIZE)
xdp_flush_frame_bulk(bq);
}
}
- bq->q[bq->count++] = xdpf->data;
+ bq->q[bq->count++] = virt_to_netmem(xdpf->data);
}
EXPORT_SYMBOL_GPL(xdp_return_frame_bulk);
--
2.47.0
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