mirror/xdp-project-bpf-examples
1
0
Fork 0
mirror of https://github.com/xdp-project/bpf-examples.git synced 2024-05-06 15:54:53 +00:00
Code Issues Projects Releases Wiki Activity

traffic-pacing-edt: implement spead across CPUs

Browse Source 
Signed-off-by: Jesper D. Brouer <netoptimizer@brouer.com>
This commit is contained in:
Jesper D. Brouer
2020-12-16 16:40:15 +01:00
parent b3ebc2c18c
commit e8ae6a9287
2 changed files with 24 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
traffic-pacing-edt/xdp_cpumap_loader.c
View File

@@ -78,7 +78,7 @@ static int create_cpu_entry(int cpumap_fd, __u32 cpu,
err = bpf_map_update_elem(cpumap_fd, &cpu, value, 0);
if (err) {
fprintf(stderr, "Create CPU entry failed (err:%d)\n", err);
exit(EXIT_FAIL_BPF);
return EXIT_FAIL_BPF;
}
return 0;

24
traffic-pacing-edt/xdp_cpumap_qinq.c
View File

@@ -12,6 +12,9 @@
#define MAX_CPUS 24
/* This global variable is used for limiting CPU that can be selected */
__u32 global_max_cpus = 12; /* TODO: Allow userspace to adjust this */
/* Special map type that can XDP_REDIRECT frames to another CPU */
struct {
__uint(type, BPF_MAP_TYPE_CPUMAP);
@@ -20,6 +23,22 @@ struct {
__uint(max_entries, MAX_CPUS);
} cpumap SEC(".maps");
static __always_inline
__u16 extract_vlan_key(struct collect_vlans *vlans)
{
__u16 vlan_key = 0;
if (vlans->id[1]) {
/* Inner Q-in-Q VLAN present use that as key */
vlan_key = vlans->id[1];
} else {
/* If only one VLAN tag, use it as key */
vlan_key = vlans->id[0];
}
return vlan_key;
}
SEC("xdp")
int xdp_cpumap_qinq(struct xdp_md *ctx)
{
@@ -53,7 +72,10 @@ int xdp_cpumap_qinq(struct xdp_md *ctx)
goto out;
}
// WARNING: Userspace MUST insert entries into cpumap
/* Use inner VLAN as key and hash based on max_cpus */
cpu_dest = extract_vlan_key(&vlans) % global_max_cpus;
/* Notice: Userspace MUST insert entries into cpumap */
action = bpf_redirect_map(&cpumap, cpu_dest, XDP_PASS);
out:
return action;