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Message-ID: <20241015145350.4077765-8-aleksander.lobakin@intel.com>
Date: Tue, 15 Oct 2024 16:53:39 +0200
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>,
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 v2 07/18] net: 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 for the XDP live frame mode in BPF_TEST_RUN; for the same
reason, make the per-cpu variable non-static so we can access it from
the test_run code as well.
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 72f53e7610ec..692f21c28ea5 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3308,6 +3308,7 @@ 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;
}
--
2.46.2
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