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bpf: Fix release of page_pool in BPF_PROG_RUN in test runner 

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: b530e9e106 ("bpf: Add "live packet" mode for XDP in BPF_PROG_RUN")
Reported-by: Freysteinn Alfredsson <freysteinn.alfredsson@kau.se>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20220409213053.3117305-1-toke@redhat.com
This commit is contained in:
Toke Høiland-Jørgensen 2022-04-09 23:30:53 +02:00 committed by Daniel Borkmann
parent 8de8b71b78
commit 425d239379
1 changed files with 3 additions and 2 deletions
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5
net/bpf/test_run.c
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@ -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);