netdev - [PATCH net-next v3 07/18] xdp: register system page pool as an XDP memory model

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Message-ID: <20241030165201.442301-8-aleksander.lobakin@intel.com>
Date: Wed, 30 Oct 2024 17:51:50 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
	Toke Høiland-Jørgensen <toke@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	John Fastabend <john.fastabend@...il.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	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 v3 07/18] xdp: register system page pool as an XDP memory model

From: Toke Høiland-Jørgensen <toke@...hat.com>

To make the system page pool usable as a source for allocating XDP
frames, we need to register it with xdp_reg_mem_model(), so that page
return works correctly. This is done in preparation for using the system
page_pool to convert XDP_PASS XSk frames to skbs; for the same reason,
make the per-cpu variable non-static so we can access it from other
source files as well (but w/o exporting).

Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
 include/linux/netdevice.h |  1 +
 net/core/dev.c            | 10 +++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 201f0c0ec62e..943945702ac6 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3305,6 +3305,7 @@ struct softnet_data {
 };
 
 DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
+DECLARE_PER_CPU(struct page_pool *, system_page_pool);
 
 #ifndef CONFIG_PREEMPT_RT
 static inline int dev_recursion_level(void)
diff --git a/net/core/dev.c b/net/core/dev.c
index b857abb5c0e9..773388f26d4f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -460,7 +460,7 @@ EXPORT_PER_CPU_SYMBOL(softnet_data);
  * PP consumers must pay attention to run APIs in the appropriate context
  * (e.g. NAPI context).
  */
-static DEFINE_PER_CPU(struct page_pool *, system_page_pool);
+DEFINE_PER_CPU(struct page_pool *, system_page_pool);
 
 #ifdef CONFIG_LOCKDEP
 /*
@@ -12103,11 +12103,18 @@ static int net_page_pool_create(int cpuid)
 		.nid = cpu_to_mem(cpuid),
 	};
 	struct page_pool *pp_ptr;
+	int err;
 
 	pp_ptr = page_pool_create_percpu(&page_pool_params, cpuid);
 	if (IS_ERR(pp_ptr))
 		return -ENOMEM;
 
+	err = xdp_reg_page_pool(pp_ptr);
+	if (err) {
+		page_pool_destroy(pp_ptr);
+		return err;
+	}
+
 	per_cpu(system_page_pool, cpuid) = pp_ptr;
 #endif
 	return 0;
@@ -12241,6 +12248,7 @@ static int __init net_dev_init(void)
 			if (!pp_ptr)
 				continue;
 
+			xdp_unreg_page_pool(pp_ptr);
 			page_pool_destroy(pp_ptr);
 			per_cpu(system_page_pool, i) = NULL;
 		}
-- 
2.47.0