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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>
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define KBUILD_MODNAME "foo"
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#include <uapi/linux/bpf.h>
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#include "bpf_helpers.h"
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#include "xdpsock.h"
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struct bpf_map_def SEC("maps") qidconf_map = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(int),
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.value_size = sizeof(int),
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.max_entries = 1,
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};
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struct bpf_map_def SEC("maps") xsks_map = {
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.type = BPF_MAP_TYPE_XSKMAP,
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.key_size = sizeof(int),
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.value_size = sizeof(int),
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.max_entries = 4,
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};
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struct bpf_map_def SEC("maps") rr_map = {
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.type = BPF_MAP_TYPE_PERCPU_ARRAY,
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.key_size = sizeof(int),
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.value_size = sizeof(unsigned int),
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.max_entries = 1,
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};
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SEC("xdp_sock")
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int xdp_sock_prog(struct xdp_md *ctx)
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{
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int *qidconf, key = 0, idx;
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unsigned int *rr;
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qidconf = bpf_map_lookup_elem(&qidconf_map, &key);
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if (!qidconf)
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return XDP_ABORTED;
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if (*qidconf != ctx->rx_queue_index)
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return XDP_PASS;
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#if RR_LB /* NB! RR_LB is configured in xdpsock.h */
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rr = bpf_map_lookup_elem(&rr_map, &key);
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if (!rr)
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return XDP_ABORTED;
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*rr = (*rr + 1) & (MAX_SOCKS - 1);
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idx = *rr;
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#else
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idx = 0;
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#endif
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return bpf_redirect_map(&xsks_map, idx, 0);
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}
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char _license[] SEC("license") = "GPL";
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