mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
b4b8faa1de
This is a sample application for AF_XDP sockets. The application
supports three different modes of operation: rxdrop, txonly and l2fwd.
To show-case a simple round-robin load-balancing between a set of
sockets in an xskmap, set the RR_LB compile time define option to 1 in
"xdpsock.h".
v2: The entries variable was calculated twice in {umem,xq}_nb_avail.
Co-authored-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#define KBUILD_MODNAME "foo"
|
|
#include <uapi/linux/bpf.h>
|
|
#include "bpf_helpers.h"
|
|
|
|
#include "xdpsock.h"
|
|
|
|
struct bpf_map_def SEC("maps") qidconf_map = {
|
|
.type = BPF_MAP_TYPE_ARRAY,
|
|
.key_size = sizeof(int),
|
|
.value_size = sizeof(int),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") xsks_map = {
|
|
.type = BPF_MAP_TYPE_XSKMAP,
|
|
.key_size = sizeof(int),
|
|
.value_size = sizeof(int),
|
|
.max_entries = 4,
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") rr_map = {
|
|
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
|
.key_size = sizeof(int),
|
|
.value_size = sizeof(unsigned int),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
SEC("xdp_sock")
|
|
int xdp_sock_prog(struct xdp_md *ctx)
|
|
{
|
|
int *qidconf, key = 0, idx;
|
|
unsigned int *rr;
|
|
|
|
qidconf = bpf_map_lookup_elem(&qidconf_map, &key);
|
|
if (!qidconf)
|
|
return XDP_ABORTED;
|
|
|
|
if (*qidconf != ctx->rx_queue_index)
|
|
return XDP_PASS;
|
|
|
|
#if RR_LB /* NB! RR_LB is configured in xdpsock.h */
|
|
rr = bpf_map_lookup_elem(&rr_map, &key);
|
|
if (!rr)
|
|
return XDP_ABORTED;
|
|
|
|
*rr = (*rr + 1) & (MAX_SOCKS - 1);
|
|
idx = *rr;
|
|
#else
|
|
idx = 0;
|
|
#endif
|
|
|
|
return bpf_redirect_map(&xsks_map, idx, 0);
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|