netdev - [PATCH bpf-next 2/8] page_pool: Store the XDP mem id

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Date:   Thu,  2 Dec 2021 01:02:23 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH bpf-next 2/8] page_pool: Store the XDP mem id

Store the XDP mem ID inside the page_pool struct so it can be retrieved
later for use in bpf_prog_run().

Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
 include/net/page_pool.h | 9 +++++++--
 net/core/page_pool.c    | 4 +++-
 net/core/xdp.c          | 2 +-
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index a71201854c41..6bc0409c4ffd 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -96,6 +96,7 @@ struct page_pool {
 	unsigned int frag_offset;
 	struct page *frag_page;
 	long frag_users;
+	u32 xdp_mem_id;
 
 	/*
 	 * Data structure for allocation side
@@ -170,9 +171,12 @@ bool page_pool_return_skb_page(struct page *page);
 
 struct page_pool *page_pool_create(const struct page_pool_params *params);
 
+struct xdp_mem_info;
+
 #ifdef CONFIG_PAGE_POOL
 void page_pool_destroy(struct page_pool *pool);
-void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *));
+void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *),
+			   struct xdp_mem_info *mem);
 void page_pool_release_page(struct page_pool *pool, struct page *page);
 void page_pool_put_page_bulk(struct page_pool *pool, void **data,
 			     int count);
@@ -182,7 +186,8 @@ static inline void page_pool_destroy(struct page_pool *pool)
 }
 
 static inline void page_pool_use_xdp_mem(struct page_pool *pool,
-					 void (*disconnect)(void *))
+					 void (*disconnect)(void *),
+					 struct xdp_mem_info *mem)
 {
 }
 static inline void page_pool_release_page(struct page_pool *pool,
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index fb5a90b9d574..2605467251f1 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -695,10 +695,12 @@ static void page_pool_release_retry(struct work_struct *wq)
 	schedule_delayed_work(&pool->release_dw, DEFER_TIME);
 }
 
-void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *))
+void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *),
+			   struct xdp_mem_info *mem)
 {
 	refcount_inc(&pool->user_cnt);
 	pool->disconnect = disconnect;
+	pool->xdp_mem_id = mem->id;
 }
 
 void page_pool_destroy(struct page_pool *pool)
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 5ddc29f29bad..143388c6d9dd 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -318,7 +318,7 @@ int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
 	}
 
 	if (type == MEM_TYPE_PAGE_POOL)
-		page_pool_use_xdp_mem(allocator, mem_allocator_disconnect);
+		page_pool_use_xdp_mem(allocator, mem_allocator_disconnect, mem);
 
 	mutex_unlock(&mem_id_lock);
 
-- 
2.34.0