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Message-ID: <168545704139.2996228.2516528552939485216.stgit@firesoul> Date: Tue, 30 May 2023 16:30:41 +0200 From: Jesper Dangaard Brouer <brouer@...hat.com> To: Tariq Toukan <ttoukan.linux@...il.com>, Daniel Borkmann <borkmann@...earbox.net>, Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii.nakryiko@...il.com>, bpf@...r.kernel.org Cc: Jesper Dangaard Brouer <brouer@...hat.com>, Tariq Toukan <tariqt@...dia.com>, gal@...dia.com, lorenzo@...nel.org, netdev@...r.kernel.org, andrew.gospodarek@...adcom.com Subject: [PATCH bpf-next] samples/bpf: xdp1 and xdp2 reduce XDPBUFSIZE to 60 Default samples/pktgen scripts send 60 byte packets as hardware adds 4-bytes FCS checksum, which fulfils minimum Ethernet 64 bytes frame size. XDP layer will not necessary have access to the 4-bytes FCS checksum. This leads to bpf_xdp_load_bytes() failing as it tries to copy 64-bytes from an XDP packet that only have 60-bytes available. Fixes: 772251742262 ("samples/bpf: fixup some tools to be able to support xdp multibuffer") Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com> --- samples/bpf/xdp1_kern.c | 2 +- samples/bpf/xdp2_kern.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/samples/bpf/xdp1_kern.c b/samples/bpf/xdp1_kern.c index 0a5c704badd0..d91f27cbcfa9 100644 --- a/samples/bpf/xdp1_kern.c +++ b/samples/bpf/xdp1_kern.c @@ -39,7 +39,7 @@ static int parse_ipv6(void *data, u64 nh_off, void *data_end) return ip6h->nexthdr; } -#define XDPBUFSIZE 64 +#define XDPBUFSIZE 60 SEC("xdp.frags") int xdp_prog1(struct xdp_md *ctx) { diff --git a/samples/bpf/xdp2_kern.c b/samples/bpf/xdp2_kern.c index 67804ecf7ce3..8bca674451ed 100644 --- a/samples/bpf/xdp2_kern.c +++ b/samples/bpf/xdp2_kern.c @@ -55,7 +55,7 @@ static int parse_ipv6(void *data, u64 nh_off, void *data_end) return ip6h->nexthdr; } -#define XDPBUFSIZE 64 +#define XDPBUFSIZE 60 SEC("xdp.frags") int xdp_prog1(struct xdp_md *ctx) {
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