forked from Minki/linux
samples/bpf: xdp_redirect_cpu: Load a eBPF program on cpumap
Extend xdp_redirect_cpu_{usr,kern}.c adding the possibility to load
a XDP program on cpumap entries. The following options have been added:
- mprog-name: cpumap entry program name
- mprog-filename: cpumap entry program filename
- redirect-device: output interface if the cpumap program performs a
XDP_REDIRECT to an egress interface
- redirect-map: bpf map used to perform XDP_REDIRECT to an egress
interface
- mprog-disable: disable loading XDP program on cpumap entries
Add xdp_pass, xdp_drop, xdp_redirect stats accounting
Co-developed-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/aa5a9a281b9dac425620fdabe82670ffb6bbdb92.1594734381.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi
Daniel Borkmann
parent
4be556cf5a
commit
ce4dade7f1
@ -21,7 +21,7 @@
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struct {
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__uint(type, BPF_MAP_TYPE_CPUMAP);
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__uint(key_size, sizeof(u32));
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__uint(value_size, sizeof(u32));
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__uint(value_size, sizeof(struct bpf_cpumap_val));
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__uint(max_entries, MAX_CPUS);
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} cpu_map SEC(".maps");
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@ -30,6 +30,9 @@ struct datarec {
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__u64 processed;
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__u64 dropped;
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__u64 issue;
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__u64 xdp_pass;
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__u64 xdp_drop;
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__u64 xdp_redirect;
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};
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/* Count RX packets, as XDP bpf_prog doesn't get direct TX-success
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@ -692,13 +695,16 @@ int trace_xdp_cpumap_enqueue(struct cpumap_enqueue_ctx *ctx)
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* Code in: kernel/include/trace/events/xdp.h
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*/
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struct cpumap_kthread_ctx {
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u64 __pad; // First 8 bytes are not accessible by bpf code
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int map_id; // offset:8; size:4; signed:1;
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u32 act; // offset:12; size:4; signed:0;
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int cpu; // offset:16; size:4; signed:1;
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unsigned int drops; // offset:20; size:4; signed:0;
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unsigned int processed; // offset:24; size:4; signed:0;
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int sched; // offset:28; size:4; signed:1;
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u64 __pad; // First 8 bytes are not accessible
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int map_id; // offset:8; size:4; signed:1;
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u32 act; // offset:12; size:4; signed:0;
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int cpu; // offset:16; size:4; signed:1;
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unsigned int drops; // offset:20; size:4; signed:0;
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unsigned int processed; // offset:24; size:4; signed:0;
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int sched; // offset:28; size:4; signed:1;
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unsigned int xdp_pass; // offset:32; size:4; signed:0;
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unsigned int xdp_drop; // offset:36; size:4; signed:0;
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unsigned int xdp_redirect; // offset:40; size:4; signed:0;
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};
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SEC("tracepoint/xdp/xdp_cpumap_kthread")
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@ -712,6 +718,9 @@ int trace_xdp_cpumap_kthread(struct cpumap_kthread_ctx *ctx)
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return 0;
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rec->processed += ctx->processed;
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rec->dropped += ctx->drops;
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rec->xdp_pass += ctx->xdp_pass;
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rec->xdp_drop += ctx->xdp_drop;
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rec->xdp_redirect += ctx->xdp_redirect;
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/* Count times kthread yielded CPU via schedule call */
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if (ctx->sched)
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@ -70,6 +70,11 @@ static const struct option long_options[] = {
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{"stress-mode", no_argument, NULL, 'x' },
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{"no-separators", no_argument, NULL, 'z' },
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{"force", no_argument, NULL, 'F' },
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{"mprog-disable", no_argument, NULL, 'n' },
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{"mprog-name", required_argument, NULL, 'e' },
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{"mprog-filename", required_argument, NULL, 'f' },
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{"redirect-device", required_argument, NULL, 'r' },
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{"redirect-map", required_argument, NULL, 'm' },
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{0, 0, NULL, 0 }
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};
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@ -156,6 +161,9 @@ struct datarec {
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__u64 processed;
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__u64 dropped;
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__u64 issue;
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__u64 xdp_pass;
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__u64 xdp_drop;
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__u64 xdp_redirect;
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};
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struct record {
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__u64 timestamp;
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@ -175,6 +183,9 @@ static bool map_collect_percpu(int fd, __u32 key, struct record *rec)
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/* For percpu maps, userspace gets a value per possible CPU */
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unsigned int nr_cpus = bpf_num_possible_cpus();
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struct datarec values[nr_cpus];
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__u64 sum_xdp_redirect = 0;
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__u64 sum_xdp_pass = 0;
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__u64 sum_xdp_drop = 0;
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__u64 sum_processed = 0;
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__u64 sum_dropped = 0;
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__u64 sum_issue = 0;
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@ -196,10 +207,19 @@ static bool map_collect_percpu(int fd, __u32 key, struct record *rec)
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sum_dropped += values[i].dropped;
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rec->cpu[i].issue = values[i].issue;
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sum_issue += values[i].issue;
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rec->cpu[i].xdp_pass = values[i].xdp_pass;
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sum_xdp_pass += values[i].xdp_pass;
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rec->cpu[i].xdp_drop = values[i].xdp_drop;
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sum_xdp_drop += values[i].xdp_drop;
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rec->cpu[i].xdp_redirect = values[i].xdp_redirect;
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sum_xdp_redirect += values[i].xdp_redirect;
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}
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rec->total.processed = sum_processed;
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rec->total.dropped = sum_dropped;
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rec->total.issue = sum_issue;
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rec->total.xdp_pass = sum_xdp_pass;
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rec->total.xdp_drop = sum_xdp_drop;
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rec->total.xdp_redirect = sum_xdp_redirect;
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return true;
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}
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@ -300,17 +320,33 @@ static __u64 calc_errs_pps(struct datarec *r,
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return pps;
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}
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static void calc_xdp_pps(struct datarec *r, struct datarec *p,
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double *xdp_pass, double *xdp_drop,
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double *xdp_redirect, double period_)
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{
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*xdp_pass = 0, *xdp_drop = 0, *xdp_redirect = 0;
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if (period_ > 0) {
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*xdp_redirect = (r->xdp_redirect - p->xdp_redirect) / period_;
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*xdp_pass = (r->xdp_pass - p->xdp_pass) / period_;
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*xdp_drop = (r->xdp_drop - p->xdp_drop) / period_;
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}
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}
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static void stats_print(struct stats_record *stats_rec,
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struct stats_record *stats_prev,
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char *prog_name)
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char *prog_name, char *mprog_name, int mprog_fd)
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{
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unsigned int nr_cpus = bpf_num_possible_cpus();
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double pps = 0, drop = 0, err = 0;
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bool mprog_enabled = false;
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struct record *rec, *prev;
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int to_cpu;
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double t;
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int i;
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if (mprog_fd > 0)
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mprog_enabled = true;
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/* Header */
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printf("Running XDP/eBPF prog_name:%s\n", prog_name);
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printf("%-15s %-7s %-14s %-11s %-9s\n",
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@ -455,6 +491,34 @@ static void stats_print(struct stats_record *stats_rec,
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printf(fm2_err, "xdp_exception", "total", pps, drop);
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}
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/* CPUMAP attached XDP program that runs on remote/destination CPU */
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if (mprog_enabled) {
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char *fmt_k = "%-15s %-7d %'-14.0f %'-11.0f %'-10.0f\n";
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char *fm2_k = "%-15s %-7s %'-14.0f %'-11.0f %'-10.0f\n";
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double xdp_pass, xdp_drop, xdp_redirect;
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printf("\n2nd remote XDP/eBPF prog_name: %s\n", mprog_name);
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printf("%-15s %-7s %-14s %-11s %-9s\n",
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"XDP-cpumap", "CPU:to", "xdp-pass", "xdp-drop", "xdp-redir");
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rec = &stats_rec->kthread;
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prev = &stats_prev->kthread;
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t = calc_period(rec, prev);
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for (i = 0; i < nr_cpus; i++) {
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struct datarec *r = &rec->cpu[i];
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struct datarec *p = &prev->cpu[i];
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calc_xdp_pps(r, p, &xdp_pass, &xdp_drop,
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&xdp_redirect, t);
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if (xdp_pass > 0 || xdp_drop > 0 || xdp_redirect > 0)
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printf(fmt_k, "xdp-in-kthread", i, xdp_pass, xdp_drop,
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xdp_redirect);
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}
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calc_xdp_pps(&rec->total, &prev->total, &xdp_pass, &xdp_drop,
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&xdp_redirect, t);
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printf(fm2_k, "xdp-in-kthread", "total", xdp_pass, xdp_drop, xdp_redirect);
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}
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printf("\n");
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fflush(stdout);
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}
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@ -491,7 +555,7 @@ static inline void swap(struct stats_record **a, struct stats_record **b)
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*b = tmp;
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}
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static int create_cpu_entry(__u32 cpu, __u32 queue_size,
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static int create_cpu_entry(__u32 cpu, struct bpf_cpumap_val *value,
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__u32 avail_idx, bool new)
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{
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__u32 curr_cpus_count = 0;
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@ -501,7 +565,7 @@ static int create_cpu_entry(__u32 cpu, __u32 queue_size,
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/* Add a CPU entry to cpumap, as this allocate a cpu entry in
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* the kernel for the cpu.
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*/
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ret = bpf_map_update_elem(cpu_map_fd, &cpu, &queue_size, 0);
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ret = bpf_map_update_elem(cpu_map_fd, &cpu, value, 0);
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if (ret) {
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fprintf(stderr, "Create CPU entry failed (err:%d)\n", ret);
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exit(EXIT_FAIL_BPF);
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@ -532,9 +596,9 @@ static int create_cpu_entry(__u32 cpu, __u32 queue_size,
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}
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}
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/* map_fd[7] = cpus_iterator */
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printf("%s CPU:%u as idx:%u queue_size:%d (total cpus_count:%u)\n",
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printf("%s CPU:%u as idx:%u qsize:%d prog_fd: %d (cpus_count:%u)\n",
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new ? "Add-new":"Replace", cpu, avail_idx,
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queue_size, curr_cpus_count);
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value->qsize, value->bpf_prog.fd, curr_cpus_count);
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return 0;
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}
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@ -558,21 +622,26 @@ static void mark_cpus_unavailable(void)
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}
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/* Stress cpumap management code by concurrently changing underlying cpumap */
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static void stress_cpumap(void)
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static void stress_cpumap(struct bpf_cpumap_val *value)
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{
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/* Changing qsize will cause kernel to free and alloc a new
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* bpf_cpu_map_entry, with an associated/complicated tear-down
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* procedure.
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*/
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create_cpu_entry(1, 1024, 0, false);
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create_cpu_entry(1, 8, 0, false);
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create_cpu_entry(1, 16000, 0, false);
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value->qsize = 1024;
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create_cpu_entry(1, value, 0, false);
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value->qsize = 8;
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create_cpu_entry(1, value, 0, false);
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value->qsize = 16000;
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create_cpu_entry(1, value, 0, false);
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}
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static void stats_poll(int interval, bool use_separators, char *prog_name,
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char *mprog_name, struct bpf_cpumap_val *value,
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bool stress_mode)
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{
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struct stats_record *record, *prev;
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int mprog_fd;
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record = alloc_stats_record();
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prev = alloc_stats_record();
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@ -584,11 +653,12 @@ static void stats_poll(int interval, bool use_separators, char *prog_name,
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while (1) {
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swap(&prev, &record);
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mprog_fd = value->bpf_prog.fd;
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stats_collect(record);
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stats_print(record, prev, prog_name);
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stats_print(record, prev, prog_name, mprog_name, mprog_fd);
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sleep(interval);
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if (stress_mode)
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stress_cpumap();
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stress_cpumap(value);
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}
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free_stats_record(record);
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@ -661,15 +731,66 @@ static int init_map_fds(struct bpf_object *obj)
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return 0;
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}
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static int load_cpumap_prog(char *file_name, char *prog_name,
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char *redir_interface, char *redir_map)
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{
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struct bpf_prog_load_attr prog_load_attr = {
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.prog_type = BPF_PROG_TYPE_XDP,
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.expected_attach_type = BPF_XDP_CPUMAP,
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.file = file_name,
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};
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struct bpf_program *prog;
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struct bpf_object *obj;
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int fd;
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if (bpf_prog_load_xattr(&prog_load_attr, &obj, &fd))
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return -1;
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if (fd < 0) {
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fprintf(stderr, "ERR: bpf_prog_load_xattr: %s\n",
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strerror(errno));
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return fd;
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}
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if (redir_interface && redir_map) {
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int err, map_fd, ifindex_out, key = 0;
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map_fd = bpf_object__find_map_fd_by_name(obj, redir_map);
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if (map_fd < 0)
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return map_fd;
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ifindex_out = if_nametoindex(redir_interface);
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if (!ifindex_out)
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return -1;
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err = bpf_map_update_elem(map_fd, &key, &ifindex_out, 0);
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if (err < 0)
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return err;
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}
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prog = bpf_object__find_program_by_title(obj, prog_name);
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if (!prog) {
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fprintf(stderr, "bpf_object__find_program_by_title failed\n");
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return EXIT_FAIL;
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}
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return bpf_program__fd(prog);
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}
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int main(int argc, char **argv)
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{
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struct rlimit r = {10 * 1024 * 1024, RLIM_INFINITY};
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char *prog_name = "xdp_cpu_map5_lb_hash_ip_pairs";
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char *mprog_filename = "xdp_redirect_kern.o";
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char *redir_interface = NULL, *redir_map = NULL;
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char *mprog_name = "xdp_redirect_dummy";
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bool mprog_disable = false;
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struct bpf_prog_load_attr prog_load_attr = {
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.prog_type = BPF_PROG_TYPE_UNSPEC,
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};
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struct bpf_prog_info info = {};
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__u32 info_len = sizeof(info);
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struct bpf_cpumap_val value;
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bool use_separators = true;
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bool stress_mode = false;
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struct bpf_program *prog;
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@ -725,7 +846,7 @@ int main(int argc, char **argv)
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memset(cpu, 0, n_cpus * sizeof(int));
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/* Parse commands line args */
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while ((opt = getopt_long(argc, argv, "hSd:s:p:q:c:xzF",
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while ((opt = getopt_long(argc, argv, "hSd:s:p:q:c:xzFf:e:r:m:",
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long_options, &longindex)) != -1) {
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switch (opt) {
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case 'd':
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@ -759,6 +880,21 @@ int main(int argc, char **argv)
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/* Selecting eBPF prog to load */
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prog_name = optarg;
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break;
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case 'n':
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mprog_disable = true;
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break;
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case 'f':
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mprog_filename = optarg;
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break;
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case 'e':
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mprog_name = optarg;
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break;
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case 'r':
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redir_interface = optarg;
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break;
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case 'm':
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redir_map = optarg;
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break;
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case 'c':
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/* Add multiple CPUs */
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add_cpu = strtoul(optarg, NULL, 0);
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@ -804,8 +940,18 @@ int main(int argc, char **argv)
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goto out;
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}
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value.bpf_prog.fd = 0;
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if (!mprog_disable)
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value.bpf_prog.fd = load_cpumap_prog(mprog_filename, mprog_name,
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redir_interface, redir_map);
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if (value.bpf_prog.fd < 0) {
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err = value.bpf_prog.fd;
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goto out;
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}
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value.qsize = qsize;
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for (i = 0; i < added_cpus; i++)
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create_cpu_entry(cpu[i], qsize, i, true);
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create_cpu_entry(cpu[i], &value, i, true);
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/* Remove XDP program when program is interrupted or killed */
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signal(SIGINT, int_exit);
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@ -838,7 +984,8 @@ int main(int argc, char **argv)
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}
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prog_id = info.id;
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stats_poll(interval, use_separators, prog_name, stress_mode);
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stats_poll(interval, use_separators, prog_name, mprog_name,
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&value, stress_mode);
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out:
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free(cpu);
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return err;
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