Commit bac142ac authored by Nicolas Schichan's avatar Nicolas Schichan Committed by David S. Miller
Browse files

test_bpf: allow tests to specify an skb fragment.

This introduce a new test->aux flag (FLAG_SKB_FRAG) to tell the
populate_skb() function to add a fragment to the test skb containing
the data specified in test->frag_data).

Signed-off-by: default avatarNicolas Schichan <>
Acked-by: default avatarAlexei Starovoitov <>
Acked-by: default avatarDaniel Borkmann <>
Signed-off-by: default avatarDavid S. Miller <>
parent e34684f8
......@@ -23,6 +23,7 @@
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/random.h>
#include <linux/highmem.h>
/* General test specific settings */
#define MAX_SUBTESTS 3
......@@ -56,6 +57,7 @@
/* Flags that can be passed to test cases */
#define FLAG_NO_DATA BIT(0)
#define FLAG_SKB_FRAG BIT(2)
enum {
CLASSIC = BIT(6), /* Old BPF instructions only. */
......@@ -81,6 +83,7 @@ struct bpf_test {
__u32 result;
int (*fill_helper)(struct bpf_test *self);
__u8 frag_data[MAX_DATA];
/* Large test cases need separate allocation and fill handler. */
......@@ -4525,6 +4528,9 @@ static struct sk_buff *populate_skb(char *buf, int size)
static void *generate_test_data(struct bpf_test *test, int sub)
struct sk_buff *skb;
struct page *page;
if (test->aux & FLAG_NO_DATA)
return NULL;
......@@ -4532,7 +4538,38 @@ static void *generate_test_data(struct bpf_test *test, int sub)
* subtests generate skbs of different sizes based on
* the same data.
return populate_skb(test->data, test->test[sub].data_size);
skb = populate_skb(test->data, test->test[sub].data_size);
if (!skb)
return NULL;
if (test->aux & FLAG_SKB_FRAG) {
* when the test requires a fragmented skb, add a
* single fragment to the skb, filled with
* test->frag_data.
void *ptr;
page = alloc_page(GFP_KERNEL);
if (!page)
goto err_kfree_skb;
ptr = kmap(page);
if (!ptr)
goto err_free_page;
memcpy(ptr, test->frag_data, MAX_DATA);
skb_add_rx_frag(skb, 0, page, 0, MAX_DATA, MAX_DATA);
return skb;
return NULL;
static void release_test_data(const struct bpf_test *test, void *data)
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment