netdev - [PATCH net-next v9 05/20] net: page_pool: add mp op for netlink reporting

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Message-ID: <20241218003748.796939-6-dw@davidwei.uk>
Date: Tue, 17 Dec 2024 16:37:31 -0800
From: David Wei <dw@...idwei.uk>
To: io-uring@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>,
	Pavel Begunkov <asml.silence@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	David Ahern <dsahern@...nel.org>,
	Mina Almasry <almasrymina@...gle.com>,
	Stanislav Fomichev <stfomichev@...il.com>,
	Joe Damato <jdamato@...tly.com>,
	Pedro Tammela <pctammela@...atatu.com>
Subject: [PATCH net-next v9 05/20] net: page_pool: add mp op for netlink reporting

From: Pavel Begunkov <asml.silence@...il.com>

Add a mandatory memory provider callback that prints information about
the provider.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Signed-off-by: David Wei <dw@...idwei.uk>
---
 include/net/page_pool/types.h | 1 +
 net/core/devmem.c             | 9 +++++++++
 net/core/page_pool_user.c     | 3 +--
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
index d6241e8a5106..a473ea0c48c4 100644
--- a/include/net/page_pool/types.h
+++ b/include/net/page_pool/types.h
@@ -157,6 +157,7 @@ struct memory_provider_ops {
 	bool (*release_netmem)(struct page_pool *pool, netmem_ref netmem);
 	int (*init)(struct page_pool *pool);
 	void (*destroy)(struct page_pool *pool);
+	int (*nl_report)(const struct page_pool *pool, struct sk_buff *rsp);
 };
 
 struct pp_memory_provider_params {
diff --git a/net/core/devmem.c b/net/core/devmem.c
index 48903b7ab215..df51a6c312db 100644
--- a/net/core/devmem.c
+++ b/net/core/devmem.c
@@ -394,9 +394,18 @@ bool mp_dmabuf_devmem_release_page(struct page_pool *pool, netmem_ref netmem)
 	return false;
 }
 
+static int mp_dmabuf_devmem_nl_report(const struct page_pool *pool,
+				      struct sk_buff *rsp)
+{
+	const struct net_devmem_dmabuf_binding *binding = pool->mp_priv;
+
+	return nla_put_u32(rsp, NETDEV_A_PAGE_POOL_DMABUF, binding->id);
+}
+
 static const struct memory_provider_ops dmabuf_devmem_ops = {
 	.init			= mp_dmabuf_devmem_init,
 	.destroy		= mp_dmabuf_devmem_destroy,
 	.alloc_netmems		= mp_dmabuf_devmem_alloc_netmems,
 	.release_netmem		= mp_dmabuf_devmem_release_page,
+	.nl_report		= mp_dmabuf_devmem_nl_report,
 };
diff --git a/net/core/page_pool_user.c b/net/core/page_pool_user.c
index 8d31c71bea1a..61212f388bc8 100644
--- a/net/core/page_pool_user.c
+++ b/net/core/page_pool_user.c
@@ -214,7 +214,6 @@ static int
 page_pool_nl_fill(struct sk_buff *rsp, const struct page_pool *pool,
 		  const struct genl_info *info)
 {
-	struct net_devmem_dmabuf_binding *binding = pool->mp_priv;
 	size_t inflight, refsz;
 	void *hdr;
 
@@ -244,7 +243,7 @@ page_pool_nl_fill(struct sk_buff *rsp, const struct page_pool *pool,
 			 pool->user.detach_time))
 		goto err_cancel;
 
-	if (binding && nla_put_u32(rsp, NETDEV_A_PAGE_POOL_DMABUF, binding->id))
+	if (pool->mp_ops && pool->mp_ops->nl_report(pool, rsp))
 		goto err_cancel;
 
 	genlmsg_end(rsp, hdr);
-- 
2.43.5