diff options
Diffstat (limited to 'samples/bpf')
| -rw-r--r-- | samples/bpf/xdp_monitor_kern.c | 94 | ||||
| -rw-r--r-- | samples/bpf/xdp_monitor_user.c | 416 |
2 files changed, 443 insertions, 67 deletions
diff --git a/samples/bpf/xdp_monitor_kern.c b/samples/bpf/xdp_monitor_kern.c index c969141bfa8b..211db8ded0de 100644 --- a/samples/bpf/xdp_monitor_kern.c +++ b/samples/bpf/xdp_monitor_kern.c @@ -1,6 +1,7 @@ -/* XDP monitor tool, based on tracepoints +/* SPDX-License-Identifier: GPL-2.0 + * Copyright(c) 2017-2018 Jesper Dangaard Brouer, Red Hat Inc. * - * Copyright(c) 2017 Jesper Dangaard Brouer, Red Hat Inc. + * XDP monitor tool, based on tracepoints */ #include <uapi/linux/bpf.h> #include "bpf_helpers.h" @@ -118,3 +119,92 @@ int trace_xdp_exception(struct xdp_exception_ctx *ctx) return 0; } + +/* Common stats data record shared with _user.c */ +struct datarec { + u64 processed; + u64 dropped; + u64 info; +}; +#define MAX_CPUS 64 + +struct bpf_map_def SEC("maps") cpumap_enqueue_cnt = { + .type = BPF_MAP_TYPE_PERCPU_ARRAY, + .key_size = sizeof(u32), + .value_size = sizeof(struct datarec), + .max_entries = MAX_CPUS, +}; + +struct bpf_map_def SEC("maps") cpumap_kthread_cnt = { + .type = BPF_MAP_TYPE_PERCPU_ARRAY, + .key_size = sizeof(u32), + .value_size = sizeof(struct datarec), + .max_entries = 1, +}; + +/* Tracepoint: /sys/kernel/debug/tracing/events/xdp/xdp_cpumap_enqueue/format + * Code in: kernel/include/trace/events/xdp.h + */ +struct cpumap_enqueue_ctx { + u64 __pad; // First 8 bytes are not accessible by bpf code + int map_id; // offset:8; size:4; signed:1; + u32 act; // offset:12; size:4; signed:0; + int cpu; // offset:16; size:4; signed:1; + unsigned int drops; // offset:20; size:4; signed:0; + unsigned int processed; // offset:24; size:4; signed:0; + int to_cpu; // offset:28; size:4; signed:1; +}; + +SEC("tracepoint/xdp/xdp_cpumap_enqueue") +int trace_xdp_cpumap_enqueue(struct cpumap_enqueue_ctx *ctx) +{ + u32 to_cpu = ctx->to_cpu; + struct datarec *rec; + + if (to_cpu >= MAX_CPUS) + return 1; + + rec = bpf_map_lookup_elem(&cpumap_enqueue_cnt, &to_cpu); + if (!rec) + return 0; + rec->processed += ctx->processed; + rec->dropped += ctx->drops; + + /* Record bulk events, then userspace can calc average bulk size */ + if (ctx->processed > 0) + rec->info += 1; + + return 0; +} + +/* Tracepoint: /sys/kernel/debug/tracing/events/xdp/xdp_cpumap_kthread/format + * Code in: kernel/include/trace/events/xdp.h + */ +struct cpumap_kthread_ctx { + u64 __pad; // First 8 bytes are not accessible by bpf code + int map_id; // offset:8; size:4; signed:1; + u32 act; // offset:12; size:4; signed:0; + int cpu; // offset:16; size:4; signed:1; + unsigned int drops; // offset:20; size:4; signed:0; + unsigned int processed; // offset:24; size:4; signed:0; + int sched; // offset:28; size:4; signed:1; +}; + +SEC("tracepoint/xdp/xdp_cpumap_kthread") +int trace_xdp_cpumap_kthread(struct cpumap_kthread_ctx *ctx) +{ + struct datarec *rec; + u32 key = 0; + + rec = bpf_map_lookup_elem(&cpumap_kthread_cnt, &key); + if (!rec) + return 0; + rec->processed += ctx->processed; + rec->dropped += ctx->drops; + + /* Count times kthread yielded CPU via schedule call */ + if (ctx->sched) + rec->info++; + + return 0; +} diff --git a/samples/bpf/xdp_monitor_user.c b/samples/bpf/xdp_monitor_user.c index eaba165b3549..eec14520d513 100644 --- a/samples/bpf/xdp_monitor_user.c +++ b/samples/bpf/xdp_monitor_user.c @@ -1,4 +1,5 @@ -/* Copyright(c) 2017 Jesper Dangaard Brouer, Red Hat, Inc. +/* SPDX-License-Identifier: GPL-2.0 + * Copyright(c) 2017 Jesper Dangaard Brouer, Red Hat, Inc. */ static const char *__doc__= "XDP monitor tool, based on tracepoints\n" @@ -40,6 +41,9 @@ static const struct option long_options[] = { {0, 0, NULL, 0 } }; +/* C standard specifies two constants, EXIT_SUCCESS(0) and EXIT_FAILURE(1) */ +#define EXIT_FAIL_MEM 5 + static void usage(char *argv[]) { int i; @@ -108,23 +112,93 @@ static const char *action2str(int action) return NULL; } +/* Common stats data record shared with _kern.c */ +struct datarec { + __u64 processed; + __u64 dropped; + __u64 info; +}; +#define MAX_CPUS 64 + +/* Userspace structs for collection of stats from maps */ struct record { - __u64 counter; __u64 timestamp; + struct datarec total; + struct datarec *cpu; +}; +struct u64rec { + __u64 processed; +}; +struct record_u64 { + /* record for _kern side __u64 values */ + __u64 timestamp; + struct u64rec total; + struct u64rec *cpu; }; struct stats_record { - struct record xdp_redir[REDIR_RES_MAX]; - struct record xdp_exception[XDP_ACTION_MAX]; + struct record_u64 xdp_redirect[REDIR_RES_MAX]; + struct record_u64 xdp_exception[XDP_ACTION_MAX]; + struct record xdp_cpumap_kthread; + struct record xdp_cpumap_enqueue[MAX_CPUS]; }; -static void stats_print_headers(bool err_only) +static bool map_collect_record(int fd, __u32 key, struct record *rec) { - if (err_only) - printf("\n%s\n", __doc_err_only__); + /* For percpu maps, userspace gets a value per possible CPU */ + unsigned int nr_cpus = bpf_num_possible_cpus(); + struct datarec values[nr_cpus]; + __u64 sum_processed = 0; + __u64 sum_dropped = 0; + __u64 sum_info = 0; + int i; + + if ((bpf_map_lookup_elem(fd, &key, values)) != 0) { + fprintf(stderr, + "ERR: bpf_map_lookup_elem failed key:0x%X\n", key); + return false; + } + /* Get time as close as possible to reading map contents */ + rec->timestamp = gettime(); - printf("%-14s %-11s %-10s %-18s %-9s\n", - "ACTION", "result", "pps ", "pps-human-readable", "measure-period"); + /* Record and sum values from each CPU */ + for (i = 0; i < nr_cpus; i++) { + rec->cpu[i].processed = values[i].processed; + sum_processed += values[i].processed; + rec->cpu[i].dropped = values[i].dropped; + sum_dropped += values[i].dropped; + rec->cpu[i].info = values[i].info; + sum_info += values[i].info; + } + rec->total.processed = sum_processed; + rec->total.dropped = sum_dropped; + rec->total.info = sum_info; + return true; +} + +static bool map_collect_record_u64(int fd, __u32 key, struct record_u64 *rec) +{ + /* For percpu maps, userspace gets a value per possible CPU */ + unsigned int nr_cpus = bpf_num_possible_cpus(); + struct u64rec values[nr_cpus]; + __u64 sum_total = 0; + int i; + + if ((bpf_map_lookup_elem(fd, &key, values)) != 0) { + fprintf(stderr, + "ERR: bpf_map_lookup_elem failed key:0x%X\n", key); + return false; + } + /* Get time as close as possible to reading map contents */ + rec->timestamp = gettime(); + + /* Record and sum values from each CPU */ + for (i = 0; i < nr_cpus; i++) { + rec->cpu[i].processed = values[i].processed; + sum_total += values[i].processed; + } + rec->total.processed = sum_total; + return true; } static double calc_period(struct record *r, struct record *p) @@ -139,77 +213,203 @@ static double calc_period(struct record *r, struct record *p) return period_; } -static double calc_pps(struct record *r, struct record *p, double period) +static double calc_period_u64(struct record_u64 *r, struct record_u64 *p) +{ + double period_ = 0; + __u64 period = 0; + + period = r->timestamp - p->timestamp; + if (period > 0) + period_ = ((double) period / NANOSEC_PER_SEC); + + return period_; +} + +static double calc_pps(struct datarec *r, struct datarec *p, double period) +{ + __u64 packets = 0; + double pps = 0; + + if (period > 0) { + packets = r->processed - p->processed; + pps = packets / period; + } + return pps; +} + +static double calc_pps_u64(struct u64rec *r, struct u64rec *p, double period) +{ + __u64 packets = 0; + double pps = 0; + + if (period > 0) { + packets = r->processed - p->processed; + pps = packets / period; + } + return pps; +} + +static double calc_drop(struct datarec *r, struct datarec *p, double period) +{ + __u64 packets = 0; + double pps = 0; + + if (period > 0) { + packets = r->dropped - p->dropped; + pps = packets / period; + } + return pps; +} + +static double calc_info(struct datarec *r, struct datarec *p, double period) { __u64 packets = 0; double pps = 0; if (period > 0) { - packets = r->counter - p->counter; + packets = r->info - p->info; pps = packets / period; } return pps; } -static void stats_print(struct stats_record *rec, - struct stats_record *prev, +static void stats_print(struct stats_record *stats_rec, + struct stats_record *stats_prev, bool err_only) { - double period = 0, pps = 0; - struct record *r, *p; - int i = 0; + unsigned int nr_cpus = bpf_num_possible_cpus(); + int rec_i = 0, i, to_cpu; + double t = 0, pps = 0; - char *fmt = "%-14s %-11s %-10.0f %'-18.0f %f\n"; + /* Header */ + printf("%-15s %-7s %-12s %-12s %-9s\n", + "XDP-event", "CPU:to", "pps", "drop-pps", "extra-info"); /* tracepoint: xdp:xdp_redirect_* */ if (err_only) - i = REDIR_ERROR; - - for (; i < REDIR_RES_MAX; i++) { - r = &rec->xdp_redir[i]; - p = &prev->xdp_redir[i]; - - if (p->timestamp) { - period = calc_period(r, p); - pps = calc_pps(r, p, period); + rec_i = REDIR_ERROR; + + for (; rec_i < REDIR_RES_MAX; rec_i++) { + struct record_u64 *rec, *prev; + char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %s\n"; + char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %s\n"; + + rec = &stats_rec->xdp_redirect[rec_i]; + prev = &stats_prev->xdp_redirect[rec_i]; + t = calc_period_u64(rec, prev); + + for (i = 0; i < nr_cpus; i++) { + struct u64rec *r = &rec->cpu[i]; + struct u64rec *p = &prev->cpu[i]; + + pps = calc_pps_u64(r, p, t); + if (pps > 0) + printf(fmt1, "XDP_REDIRECT", i, + rec_i ? 0.0: pps, rec_i ? pps : 0.0, + err2str(rec_i)); } - printf(fmt, "XDP_REDIRECT", err2str(i), pps, pps, period); + pps = calc_pps_u64(&rec->total, &prev->total, t); + printf(fmt2, "XDP_REDIRECT", "total", + rec_i ? 0.0: pps, rec_i ? pps : 0.0, err2str(rec_i)); } /* tracepoint: xdp:xdp_exception */ - for (i = 0; i < XDP_ACTION_MAX; i++) { - r = &rec->xdp_exception[i]; - p = &prev->xdp_exception[i]; - if (p->timestamp) { - period = calc_period(r, p); - pps = calc_pps(r, p, period); + for (rec_i = 0; rec_i < XDP_ACTION_MAX; rec_i++) { + struct record_u64 *rec, *prev; + char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %s\n"; + char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %s\n"; + + rec = &stats_rec->xdp_exception[rec_i]; + prev = &stats_prev->xdp_exception[rec_i]; + t = calc_period_u64(rec, prev); + + for (i = 0; i < nr_cpus; i++) { + struct u64rec *r = &rec->cpu[i]; + struct u64rec *p = &prev->cpu[i]; + + pps = calc_pps_u64(r, p, t); + if (pps > 0) + printf(fmt1, "Exception", i, + 0.0, pps, err2str(rec_i)); } + pps = calc_pps_u64(&rec->total, &prev->total, t); if (pps > 0) - printf(fmt, action2str(i), "Exception", - pps, pps, period); + printf(fmt2, "Exception", "total", + 0.0, pps, action2str(rec_i)); } - printf("\n"); -} -static __u64 get_key32_value64_percpu(int fd, __u32 key) -{ - /* For percpu maps, userspace gets a value per possible CPU */ - unsigned int nr_cpus = bpf_num_possible_cpus(); - __u64 values[nr_cpus]; - __u64 sum = 0; - int i; - - if ((bpf_map_lookup_elem(fd, &key, values)) != 0) { - fprintf(stderr, - "ERR: bpf_map_lookup_elem failed key:0x%X\n", key); - return 0; + /* cpumap enqueue stats */ + for (to_cpu = 0; to_cpu < MAX_CPUS; to_cpu++) { + char *fmt1 = "%-15s %3d:%-3d %'-12.0f %'-12.0f %'-10.2f %s\n"; + char *fmt2 = "%-15s %3s:%-3d %'-12.0f %'-12.0f %'-10.2f %s\n"; + struct record *rec, *prev; + char *info_str = ""; + double drop, info; + + rec = &stats_rec->xdp_cpumap_enqueue[to_cpu]; + prev = &stats_prev->xdp_cpumap_enqueue[to_cpu]; + t = calc_period(rec, prev); + for (i = 0; i < nr_cpus; i++) { + struct datarec *r = &rec->cpu[i]; + struct datarec *p = &prev->cpu[i]; + + pps = calc_pps(r, p, t); + drop = calc_drop(r, p, t); + info = calc_info(r, p, t); + if (info > 0) { + info_str = "bulk-average"; + info = pps / info; /* calc average bulk size */ + } + if (pps > 0) + printf(fmt1, "cpumap-enqueue", + i, to_cpu, pps, drop, info, info_str); + } + pps = calc_pps(&rec->total, &prev->total, t); + if (pps > 0) { + drop = calc_drop(&rec->total, &prev->total, t); + info = calc_info(&rec->total, &prev->total, t); + if (info > 0) { + info_str = "bulk-average"; + info = pps / info; /* calc average bulk size */ + } + printf(fmt2, "cpumap-enqueue", + "sum", to_cpu, pps, drop, info, info_str); + } } - /* Sum values from each CPU */ - for (i = 0; i < nr_cpus; i++) { - sum += values[i]; + /* cpumap kthread stats */ + { + char *fmt1 = "%-15s %-7d %'-12.0f %'-12.0f %'-10.0f %s\n"; + char *fmt2 = "%-15s %-7s %'-12.0f %'-12.0f %'-10.0f %s\n"; + struct record *rec, *prev; + double drop, info; + char *i_str = ""; + + rec = &stats_rec->xdp_cpumap_kthread; + prev = &stats_prev->xdp_cpumap_kthread; + t = calc_period(rec, prev); + for (i = 0; i < nr_cpus; i++) { + struct datarec *r = &rec->cpu[i]; + struct datarec *p = &prev->cpu[i]; + + pps = calc_pps(r, p, t); + drop = calc_drop(r, p, t); + info = calc_info(r, p, t); + if (info > 0) + i_str = "sched"; + if (pps > 0) + printf(fmt1, "cpumap-kthread", + i, pps, drop, info, i_str); + } + pps = calc_pps(&rec->total, &prev->total, t); + drop = calc_drop(&rec->total, &prev->total, t); + info = calc_info(&rec->total, &prev->total, t); + if (info > 0) + i_str = "sched-sum"; + printf(fmt2, "cpumap-kthread", "total", pps, drop, info, i_str); } - return sum; + + printf("\n"); } static bool stats_collect(struct stats_record *rec) @@ -222,25 +422,109 @@ static bool stats_collect(struct stats_record *rec) */ fd = map_data[0].fd; /* map0: redirect_err_cnt */ - for (i = 0; i < REDIR_RES_MAX; i++) { - rec->xdp_redir[i].timestamp = gettime(); - rec->xdp_redir[i].counter = get_key32_value64_percpu(fd, i); - } + for (i = 0; i < REDIR_RES_MAX; i++) + map_collect_record_u64(fd, i, &rec->xdp_redirect[i]); fd = map_data[1].fd; /* map1: exception_cnt */ for (i = 0; i < XDP_ACTION_MAX; i++) { - rec->xdp_exception[i].timestamp = gettime(); - rec->xdp_exception[i].counter = get_key32_value64_percpu(fd, i); + map_collect_record_u64(fd, i, &rec->xdp_exception[i]); } + fd = map_data[2].fd; /* map2: cpumap_enqueue_cnt */ + for (i = 0; i < MAX_CPUS; i++) + map_collect_record(fd, i, &rec->xdp_cpumap_enqueue[i]); + + fd = map_data[3].fd; /* map3: cpumap_kthread_cnt */ + map_collect_record(fd, 0, &rec->xdp_cpumap_kthread); + return true; } +static void *alloc_rec_per_cpu(int record_size) +{ + unsigned int nr_cpus = bpf_num_possible_cpus(); + void *array; + size_t size; + + size = record_size * nr_cpus; + array = malloc(size); + memset(array, 0, size); + if (!array) { + fprintf(stderr, "Mem alloc error (nr_cpus:%u)\n", nr_cpus); + exit(EXIT_FAIL_MEM); + } + return array; +} + +static struct stats_record *alloc_stats_record(void) +{ + struct stats_record *rec; + int rec_sz; + int i; + + /* Alloc main stats_record structure */ + rec = malloc(sizeof(*rec)); + memset(rec, 0, sizeof(*rec)); + if (!rec) { + fprintf(stderr, "Mem alloc error\n"); + exit(EXIT_FAIL_MEM); + } + + /* Alloc stats stored per CPU for each record */ + rec_sz = sizeof(struct u64rec); + for (i = 0; i < REDIR_RES_MAX; i++) + rec->xdp_redirect[i].cpu = alloc_rec_per_cpu(rec_sz); + + for (i = 0; i < XDP_ACTION_MAX; i++) + rec->xdp_exception[i].cpu = alloc_rec_per_cpu(rec_sz); + + rec_sz = sizeof(struct datarec); + rec->xdp_cpumap_kthread.cpu = alloc_rec_per_cpu(rec_sz); + + for (i = 0; i < MAX_CPUS; i++) + rec->xdp_cpumap_enqueue[i].cpu = alloc_rec_per_cpu(rec_sz); + + return rec; +} + +static void free_stats_record(struct stats_record *r) +{ + int i; + + for (i = 0; i < REDIR_RES_MAX; i++) + free(r->xdp_redirect[i].cpu); + + for (i = 0; i < XDP_ACTION_MAX; i++) + free(r->xdp_exception[i].cpu); + + free(r->xdp_cpumap_kthread.cpu); + + for (i = 0; i < MAX_CPUS; i++) + free(r->xdp_cpumap_enqueue[i].cpu); + + free(r); +} + +/* Pointer swap trick */ +static inline void swap(struct stats_record **a, struct stats_record **b) +{ + struct stats_record *tmp; + + tmp = *a; + *a = *b; + *b = tmp; +} + static void stats_poll(int interval, bool err_only) { - struct stats_record rec, prev; + struct stats_record *rec, *prev; - memset(&rec, 0, sizeof(rec)); + rec = alloc_stats_record(); + prev = alloc_stats_record(); + stats_collect(rec); + + if (err_only) + printf("\n%s\n", __doc_err_only__); /* Trick to pretty printf with thousands separators use %' */ setlocale(LC_NUMERIC, "en_US"); @@ -258,13 +542,15 @@ static void stats_poll(int interval, bool err_only) fflush(stdout); while (1) { - memcpy(&prev, &rec, sizeof(rec)); - stats_collect(&rec); - stats_print_headers(err_only); - stats_print(&rec, &prev, err_only); + swap(&prev, &rec); + stats_collect(rec); + stats_print(rec, prev, err_only); fflush(stdout); sleep(interval); } + + free_stats_record(rec); + free_stats_record(prev); } static void print_bpf_prog_info(void) |