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Message-Id: <20220409213053.3117305-1-toke@redhat.com>
Date: Sat, 9 Apr 2022 23:30:53 +0200
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <hawk@...nel.org>,
Toke Høiland-Jørgensen <toke@...hat.com>
Cc: Freysteinn Alfredsson <freysteinn.alfredsson@....se>,
Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
bpf@...r.kernel.org
Subject: [PATCH bpf] bpf: Fix release of page_pool in BPF_PROG_RUN
The live packet mode in BPF_PROG_RUN allocates a page_pool instance for
each test run instance and uses it for the packet data. On setup it creates
the page_pool, and calls xdp_reg_mem_model() to allow pages to be returned
properly from the XDP data path. However, xdp_reg_mem_model() also raises
the reference count of the page_pool itself, so the single
page_pool_destroy() count on teardown was not enough to actually release
the pool. To fix this, add an additional xdp_unreg_mem_model() call on
teardown.
Fixes: b530e9e1063e ("bpf: Add "live packet" mode for XDP in BPF_PROG_RUN")
Reported-by: Freysteinn Alfredsson <freysteinn.alfredsson@....se>
Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
net/bpf/test_run.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index e7b9c2636d10..af709c182674 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -108,6 +108,7 @@ struct xdp_test_data {
struct page_pool *pp;
struct xdp_frame **frames;
struct sk_buff **skbs;
+ struct xdp_mem_info mem;
u32 batch_size;
u32 frame_cnt;
};
@@ -147,7 +148,6 @@ static void xdp_test_run_init_page(struct page *page, void *arg)
static int xdp_test_run_setup(struct xdp_test_data *xdp, struct xdp_buff *orig_ctx)
{
- struct xdp_mem_info mem = {};
struct page_pool *pp;
int err = -ENOMEM;
struct page_pool_params pp_params = {
@@ -174,7 +174,7 @@ static int xdp_test_run_setup(struct xdp_test_data *xdp, struct xdp_buff *orig_c
}
/* will copy 'mem.id' into pp->xdp_mem_id */
- err = xdp_reg_mem_model(&mem, MEM_TYPE_PAGE_POOL, pp);
+ err = xdp_reg_mem_model(&xdp->mem, MEM_TYPE_PAGE_POOL, pp);
if (err)
goto err_mmodel;
@@ -202,6 +202,7 @@ static int xdp_test_run_setup(struct xdp_test_data *xdp, struct xdp_buff *orig_c
static void xdp_test_run_teardown(struct xdp_test_data *xdp)
{
+ xdp_unreg_mem_model(&xdp->mem);
page_pool_destroy(xdp->pp);
kfree(xdp->frames);
kfree(xdp->skbs);
--
2.35.1
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