On Wed, Nov 30, 2016 at 05:10:11PM +0100, Thomas Graf wrote:
> Adds a series of tests to verify the functionality of attaching
> BPF programs at LWT hooks.
>
> Also adds a sample which collects a histogram of packet sizes which
> pass through an LWT hook.
>
> $ ./lwt_len_hist.sh
> Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
> MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
> 192.168.253.2 () port 0 AF_INET : demo
> Recv Send Send
> Socket Socket Message Elapsed
> Size Size Size Time Throughput
> bytes bytes bytes secs. 10^6bits/sec
>
> 87380 16384 16384 10.00 39857.69
> 1 -> 1 : 0 | |
> 2 -> 3 : 0 | |
> 4 -> 7 : 0 | |
> 8 -> 15 : 0 | |
> 16 -> 31 : 0 | |
> 32 -> 63 : 22 | |
> 64 -> 127 : 98 | |
> 128 -> 255 : 213 | |
> 256 -> 511 : 1444251 |******** |
> 512 -> 1023 : 660610 |*** |
> 1024 -> 2047 : 535241 |** |
> 2048 -> 4095 : 19 | |
> 4096 -> 8191 : 180 | |
> 8192 -> 16383 : 5578023 |************************************* |
> 16384 -> 32767 : 632099 |*** |
> 32768 -> 65535 : 6575 | |
>
> Signed-off-by: Thomas Graf <tg...@suug.ch>
> ---
> samples/bpf/Makefile | 4 +
> samples/bpf/bpf_helpers.h | 4 +
> samples/bpf/lwt_len_hist.sh | 37 ++++
> samples/bpf/lwt_len_hist_kern.c | 82 +++++++++
> samples/bpf/lwt_len_hist_user.c | 76 ++++++++
> samples/bpf/test_lwt_bpf.c | 253 +++++++++++++++++++++++++
> samples/bpf/test_lwt_bpf.sh | 399
> ++++++++++++++++++++++++++++++++++++++++
> 7 files changed, 855 insertions(+)
> create mode 100755 samples/bpf/lwt_len_hist.sh
> create mode 100644 samples/bpf/lwt_len_hist_kern.c
> create mode 100644 samples/bpf/lwt_len_hist_user.c
> create mode 100644 samples/bpf/test_lwt_bpf.c
> create mode 100755 samples/bpf/test_lwt_bpf.sh
...
> +static inline void __fill_garbage(struct __sk_buff *skb)
> +{
> + uint64_t f = 0xFFFFFFFFFFFFFFFF;
> +
> + bpf_skb_store_bytes(skb, 0, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 8, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 16, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 24, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 32, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 40, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 48, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 56, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 64, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 72, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 80, &f, sizeof(f), 0);
> + bpf_skb_store_bytes(skb, 88, &f, sizeof(f), 0);
> +}
> +
> +SEC("fill_garbage")
> +int do_fill_garbage(struct __sk_buff *skb)
> +{
> + __fill_garbage(skb);
> + printk("Set initial 96 bytes of header to FF\n");
> + return BPF_OK;
> +}
> +
> +SEC("fill_garbage_and_redirect")
> +int do_fill_garbage_and_redirect(struct __sk_buff *skb)
> +{
> + int ifindex = DST_IFINDEX;
> + __fill_garbage(skb);
> + printk("redirected to %d\n", ifindex);
> + return bpf_redirect(ifindex, 0);
> +}
Two 'garbage' tests! Pure garbage ;)
Acked-by: Alexei Starovoitov <a...@kernel.org>
