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samples/bpf: convert xdpsock to use libbpf for AF_XDP access 

This commit converts the xdpsock sample application to use the AF_XDP
functions present in libbpf. This cuts down the size of it by nearly
300 lines of code.

The default ring sizes plus the batch size has been increased and the
size of the umem area has decreased. This so that the sample application
will provide higher throughput. Note also that the shared umem code
has been removed from the sample as this is not supported by libbpf
at this point in time.

Tested-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Magnus Karlsson 2019-02-21 10:21:27 +01:00 committed by Daniel Borkmann
parent 1cad078842
commit 248c7f9c0e
4 changed files with 282 additions and 669 deletions
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1
samples/bpf/Makefile
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@ -163,7 +163,6 @@ always += xdp2skb_meta_kern.o
always += syscall_tp_kern.o
always += cpustat_kern.o
always += xdp_adjust_tail_kern.o
always += xdpsock_kern.o
always += xdp_fwd_kern.o
always += task_fd_query_kern.o
always += xdp_sample_pkts_kern.o

11
samples/bpf/xdpsock.h
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@ -1,11 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef XDPSOCK_H_
#define XDPSOCK_H_
/* Power-of-2 number of sockets */
#define MAX_SOCKS 4
/* Round-robin receive */
#define RR_LB 0
#endif /* XDPSOCK_H_ */

56
samples/bpf/xdpsock_kern.c
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@ -1,56 +0,0 @@
// 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 = MAX_SOCKS,
};
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";

883
samples/bpf/xdpsock_user.c
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