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samples/bpf: fixup some tools to be able to support xdp multibuffer

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This changes the section name for the bpf program embedded in these
files to "xdp.frags" to allow the programs to be loaded on drivers that
are using an MTU greater than PAGE_SIZE.  Rather than directly accessing
the buffers, the packet data is now accessed via xdp helper functions to
provide an example for those who may need to write more complex
programs.

v2: remove new unnecessary variable

Signed-off-by: Andy Gospodarek <gospo@broadcom.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/20220621175402.35327-1-gospo@broadcom.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andy Gospodarek 2022-06-21 17:54:02 +00:00 committed by Alexei Starovoitov
parent d4609a5d8c
commit 7722517422
3 changed files with 17 additions and 7 deletions
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11
samples/bpf/xdp1_kern.c
View File

@ -39,11 +39,13 @@ static int parse_ipv6(void *data, u64 nh_off, void *data_end)
return ip6h->nexthdr;
}
SEC("xdp1")
#define XDPBUFSIZE 64
SEC("xdp.frags")
int xdp_prog1(struct xdp_md *ctx)
{
void *data_end = (void *)(long)ctx->data_end;
void *data = (void *)(long)ctx->data;
__u8 pkt[XDPBUFSIZE] = {};
void *data_end = &pkt[XDPBUFSIZE-1];
void *data = pkt;
struct ethhdr *eth = data;
int rc = XDP_DROP;
long *value;
@ -51,6 +53,9 @@ int xdp_prog1(struct xdp_md *ctx)
u64 nh_off;
u32 ipproto;
if (bpf_xdp_load_bytes(ctx, 0, pkt, sizeof(pkt)))
return rc;
nh_off = sizeof(*eth);
if (data + nh_off > data_end)
return rc;

11
samples/bpf/xdp2_kern.c
View File

@ -55,11 +55,13 @@ static int parse_ipv6(void *data, u64 nh_off, void *data_end)
return ip6h->nexthdr;
}
SEC("xdp1")
#define XDPBUFSIZE 64
SEC("xdp.frags")
int xdp_prog1(struct xdp_md *ctx)
{
void *data_end = (void *)(long)ctx->data_end;
void *data = (void *)(long)ctx->data;
__u8 pkt[XDPBUFSIZE] = {};
void *data_end = &pkt[XDPBUFSIZE-1];
void *data = pkt;
struct ethhdr *eth = data;
int rc = XDP_DROP;
long *value;
@ -67,6 +69,9 @@ int xdp_prog1(struct xdp_md *ctx)
u64 nh_off;
u32 ipproto;
if (bpf_xdp_load_bytes(ctx, 0, pkt, sizeof(pkt)))
return rc;
nh_off = sizeof(*eth);
if (data + nh_off > data_end)
return rc;

2
samples/bpf/xdp_tx_iptunnel_kern.c
View File

@ -212,7 +212,7 @@ static __always_inline int handle_ipv6(struct xdp_md *xdp)
return XDP_TX;
}
SEC("xdp_tx_iptunnel")
SEC("xdp.frags")
int _xdp_tx_iptunnel(struct xdp_md *xdp)
{
void *data_end = (void *)(long)xdp->data_end;