--- /dev/null
+/*
+ * drivers/net/team/team_mode_loadbalance.c - Load-balancing mode for team
+ * Copyright (c) 2012 Jiri Pirko <jpirko@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/filter.h>
+#include <linux/if_team.h>
+
+struct lb_priv;
+
+typedef struct team_port *lb_select_tx_port_func_t(struct team *,
+ struct lb_priv *,
+ struct sk_buff *,
+ unsigned char);
+
+#define LB_TX_HASHTABLE_SIZE 256 /* hash is a char */
+
+struct lb_stats {
+ u64 tx_bytes;
+};
+
+struct lb_pcpu_stats {
+ struct lb_stats hash_stats[LB_TX_HASHTABLE_SIZE];
+ struct u64_stats_sync syncp;
+};
+
+struct lb_stats_info {
+ struct lb_stats stats;
+ struct lb_stats last_stats;
+ struct team_option_inst_info *opt_inst_info;
+};
+
+struct lb_port_mapping {
+ struct team_port __rcu *port;
+ struct team_option_inst_info *opt_inst_info;
+};
+
+struct lb_priv_ex {
+ struct team *team;
+ struct lb_port_mapping tx_hash_to_port_mapping[LB_TX_HASHTABLE_SIZE];
+ struct sock_fprog_kern *orig_fprog;
+ struct {
+ unsigned int refresh_interval; /* in tenths of second */
+ struct delayed_work refresh_dw;
+ struct lb_stats_info info[LB_TX_HASHTABLE_SIZE];
+ } stats;
+};
+
+struct lb_priv {
+ struct bpf_prog __rcu *fp;
+ lb_select_tx_port_func_t __rcu *select_tx_port_func;
+ struct lb_pcpu_stats __percpu *pcpu_stats;
+ struct lb_priv_ex *ex; /* priv extension */
+};
+
+static struct lb_priv *get_lb_priv(struct team *team)
+{
+ return (struct lb_priv *) &team->mode_priv;
+}
+
+struct lb_port_priv {
+ struct lb_stats __percpu *pcpu_stats;
+ struct lb_stats_info stats_info;
+};
+
+static struct lb_port_priv *get_lb_port_priv(struct team_port *port)
+{
+ return (struct lb_port_priv *) &port->mode_priv;
+}
+
+#define LB_HTPM_PORT_BY_HASH(lp_priv, hash) \
+ (lb_priv)->ex->tx_hash_to_port_mapping[hash].port
+
+#define LB_HTPM_OPT_INST_INFO_BY_HASH(lp_priv, hash) \
+ (lb_priv)->ex->tx_hash_to_port_mapping[hash].opt_inst_info
+
+static void lb_tx_hash_to_port_mapping_null_port(struct team *team,
+ struct team_port *port)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ bool changed = false;
+ int i;
+
+ for (i = 0; i < LB_TX_HASHTABLE_SIZE; i++) {
+ struct lb_port_mapping *pm;
+
+ pm = &lb_priv->ex->tx_hash_to_port_mapping[i];
+ if (rcu_access_pointer(pm->port) == port) {
+ RCU_INIT_POINTER(pm->port, NULL);
+ team_option_inst_set_change(pm->opt_inst_info);
+ changed = true;
+ }
+ }
+ if (changed)
+ team_options_change_check(team);
+}
+
+/* Basic tx selection based solely by hash */
+static struct team_port *lb_hash_select_tx_port(struct team *team,
+ struct lb_priv *lb_priv,
+ struct sk_buff *skb,
+ unsigned char hash)
+{
+ int port_index = team_num_to_port_index(team, hash);
+
+ return team_get_port_by_index_rcu(team, port_index);
+}
+
+/* Hash to port mapping select tx port */
+static struct team_port *lb_htpm_select_tx_port(struct team *team,
+ struct lb_priv *lb_priv,
+ struct sk_buff *skb,
+ unsigned char hash)
+{
+ return rcu_dereference_bh(LB_HTPM_PORT_BY_HASH(lb_priv, hash));
+}
+
+struct lb_select_tx_port {
+ char *name;
+ lb_select_tx_port_func_t *func;
+};
+
+static const struct lb_select_tx_port lb_select_tx_port_list[] = {
+ {
+ .name = "hash",
+ .func = lb_hash_select_tx_port,
+ },
+ {
+ .name = "hash_to_port_mapping",
+ .func = lb_htpm_select_tx_port,
+ },
+};
+#define LB_SELECT_TX_PORT_LIST_COUNT ARRAY_SIZE(lb_select_tx_port_list)
+
+static char *lb_select_tx_port_get_name(lb_select_tx_port_func_t *func)
+{
+ int i;
+
+ for (i = 0; i < LB_SELECT_TX_PORT_LIST_COUNT; i++) {
+ const struct lb_select_tx_port *item;
+
+ item = &lb_select_tx_port_list[i];
+ if (item->func == func)
+ return item->name;
+ }
+ return NULL;
+}
+
+static lb_select_tx_port_func_t *lb_select_tx_port_get_func(const char *name)
+{
+ int i;
+
+ for (i = 0; i < LB_SELECT_TX_PORT_LIST_COUNT; i++) {
+ const struct lb_select_tx_port *item;
+
+ item = &lb_select_tx_port_list[i];
+ if (!strcmp(item->name, name))
+ return item->func;
+ }
+ return NULL;
+}
+
+static unsigned int lb_get_skb_hash(struct lb_priv *lb_priv,
+ struct sk_buff *skb)
+{
+ struct bpf_prog *fp;
+ uint32_t lhash;
+ unsigned char *c;
+
+ fp = rcu_dereference_bh(lb_priv->fp);
+ if (unlikely(!fp))
+ return 0;
+ lhash = BPF_PROG_RUN(fp, skb);
+ c = (char *) &lhash;
+ return c[0] ^ c[1] ^ c[2] ^ c[3];
+}
+
+static void lb_update_tx_stats(unsigned int tx_bytes, struct lb_priv *lb_priv,
+ struct lb_port_priv *lb_port_priv,
+ unsigned char hash)
+{
+ struct lb_pcpu_stats *pcpu_stats;
+ struct lb_stats *port_stats;
+ struct lb_stats *hash_stats;
+
+ pcpu_stats = this_cpu_ptr(lb_priv->pcpu_stats);
+ port_stats = this_cpu_ptr(lb_port_priv->pcpu_stats);
+ hash_stats = &pcpu_stats->hash_stats[hash];
+ u64_stats_update_begin(&pcpu_stats->syncp);
+ port_stats->tx_bytes += tx_bytes;
+ hash_stats->tx_bytes += tx_bytes;
+ u64_stats_update_end(&pcpu_stats->syncp);
+}
+
+static bool lb_transmit(struct team *team, struct sk_buff *skb)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ lb_select_tx_port_func_t *select_tx_port_func;
+ struct team_port *port;
+ unsigned char hash;
+ unsigned int tx_bytes = skb->len;
+
+ hash = lb_get_skb_hash(lb_priv, skb);
+ select_tx_port_func = rcu_dereference_bh(lb_priv->select_tx_port_func);
+ port = select_tx_port_func(team, lb_priv, skb, hash);
+ if (unlikely(!port))
+ goto drop;
+ if (team_dev_queue_xmit(team, port, skb))
+ return false;
+ lb_update_tx_stats(tx_bytes, lb_priv, get_lb_port_priv(port), hash);
+ return true;
+
+drop:
+ dev_kfree_skb_any(skb);
+ return false;
+}
+
+static int lb_bpf_func_get(struct team *team, struct team_gsetter_ctx *ctx)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+
+ if (!lb_priv->ex->orig_fprog) {
+ ctx->data.bin_val.len = 0;
+ ctx->data.bin_val.ptr = NULL;
+ return 0;
+ }
+ ctx->data.bin_val.len = lb_priv->ex->orig_fprog->len *
+ sizeof(struct sock_filter);
+ ctx->data.bin_val.ptr = lb_priv->ex->orig_fprog->filter;
+ return 0;
+}
+
+static int __fprog_create(struct sock_fprog_kern **pfprog, u32 data_len,
+ const void *data)
+{
+ struct sock_fprog_kern *fprog;
+ struct sock_filter *filter = (struct sock_filter *) data;
+
+ if (data_len % sizeof(struct sock_filter))
+ return -EINVAL;
+ fprog = kmalloc(sizeof(*fprog), GFP_KERNEL);
+ if (!fprog)
+ return -ENOMEM;
+ fprog->filter = kmemdup(filter, data_len, GFP_KERNEL);
+ if (!fprog->filter) {
+ kfree(fprog);
+ return -ENOMEM;
+ }
+ fprog->len = data_len / sizeof(struct sock_filter);
+ *pfprog = fprog;
+ return 0;
+}
+
+static void __fprog_destroy(struct sock_fprog_kern *fprog)
+{
+ kfree(fprog->filter);
+ kfree(fprog);
+}
+
+static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ struct bpf_prog *fp = NULL;
+ struct bpf_prog *orig_fp = NULL;
+ struct sock_fprog_kern *fprog = NULL;
+ int err;
+
+ if (ctx->data.bin_val.len) {
+ err = __fprog_create(&fprog, ctx->data.bin_val.len,
+ ctx->data.bin_val.ptr);
+ if (err)
+ return err;
+ err = bpf_prog_create(&fp, fprog);
+ if (err) {
+ __fprog_destroy(fprog);
+ return err;
+ }
+ }
+
+ if (lb_priv->ex->orig_fprog) {
+ /* Clear old filter data */
+ __fprog_destroy(lb_priv->ex->orig_fprog);
+ orig_fp = rcu_dereference_protected(lb_priv->fp,
+ lockdep_is_held(&team->lock));
+ }
+
+ rcu_assign_pointer(lb_priv->fp, fp);
+ lb_priv->ex->orig_fprog = fprog;
+
+ if (orig_fp) {
+ synchronize_rcu();
+ bpf_prog_destroy(orig_fp);
+ }
+ return 0;
+}
+
+static int lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ lb_select_tx_port_func_t *func;
+ char *name;
+
+ func = rcu_dereference_protected(lb_priv->select_tx_port_func,
+ lockdep_is_held(&team->lock));
+ name = lb_select_tx_port_get_name(func);
+ BUG_ON(!name);
+ ctx->data.str_val = name;
+ return 0;
+}
+
+static int lb_tx_method_set(struct team *team, struct team_gsetter_ctx *ctx)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ lb_select_tx_port_func_t *func;
+
+ func = lb_select_tx_port_get_func(ctx->data.str_val);
+ if (!func)
+ return -EINVAL;
+ rcu_assign_pointer(lb_priv->select_tx_port_func, func);
+ return 0;
+}
+
+static int lb_tx_hash_to_port_mapping_init(struct team *team,
+ struct team_option_inst_info *info)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ unsigned char hash = info->array_index;
+
+ LB_HTPM_OPT_INST_INFO_BY_HASH(lb_priv, hash) = info;
+ return 0;
+}
+
+static int lb_tx_hash_to_port_mapping_get(struct team *team,
+ struct team_gsetter_ctx *ctx)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ struct team_port *port;
+ unsigned char hash = ctx->info->array_index;
+
+ port = LB_HTPM_PORT_BY_HASH(lb_priv, hash);
+ ctx->data.u32_val = port ? port->dev->ifindex : 0;
+ return 0;
+}
+
+static int lb_tx_hash_to_port_mapping_set(struct team *team,
+ struct team_gsetter_ctx *ctx)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ struct team_port *port;
+ unsigned char hash = ctx->info->array_index;
+
+ list_for_each_entry(port, &team->port_list, list) {
+ if (ctx->data.u32_val == port->dev->ifindex &&
+ team_port_enabled(port)) {
+ rcu_assign_pointer(LB_HTPM_PORT_BY_HASH(lb_priv, hash),
+ port);
+ return 0;
+ }
+ }
+ return -ENODEV;
+}
+
+static int lb_hash_stats_init(struct team *team,
+ struct team_option_inst_info *info)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ unsigned char hash = info->array_index;
+
+ lb_priv->ex->stats.info[hash].opt_inst_info = info;
+ return 0;
+}
+
+static int lb_hash_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ unsigned char hash = ctx->info->array_index;
+
+ ctx->data.bin_val.ptr = &lb_priv->ex->stats.info[hash].stats;
+ ctx->data.bin_val.len = sizeof(struct lb_stats);
+ return 0;
+}
+
+static int lb_port_stats_init(struct team *team,
+ struct team_option_inst_info *info)
+{
+ struct team_port *port = info->port;
+ struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
+
+ lb_port_priv->stats_info.opt_inst_info = info;
+ return 0;
+}
+
+static int lb_port_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
+{
+ struct team_port *port = ctx->info->port;
+ struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
+
+ ctx->data.bin_val.ptr = &lb_port_priv->stats_info.stats;
+ ctx->data.bin_val.len = sizeof(struct lb_stats);
+ return 0;
+}
+
+static void __lb_stats_info_refresh_prepare(struct lb_stats_info *s_info)
+{
+ memcpy(&s_info->last_stats, &s_info->stats, sizeof(struct lb_stats));
+ memset(&s_info->stats, 0, sizeof(struct lb_stats));
+}
+
+static bool __lb_stats_info_refresh_check(struct lb_stats_info *s_info,
+ struct team *team)
+{
+ if (memcmp(&s_info->last_stats, &s_info->stats,
+ sizeof(struct lb_stats))) {
+ team_option_inst_set_change(s_info->opt_inst_info);
+ return true;
+ }
+ return false;
+}
+
+static void __lb_one_cpu_stats_add(struct lb_stats *acc_stats,
+ struct lb_stats *cpu_stats,
+ struct u64_stats_sync *syncp)
+{
+ unsigned int start;
+ struct lb_stats tmp;
+
+ do {
+ start = u64_stats_fetch_begin_irq(syncp);
+ tmp.tx_bytes = cpu_stats->tx_bytes;
+ } while (u64_stats_fetch_retry_irq(syncp, start));
+ acc_stats->tx_bytes += tmp.tx_bytes;
+}
+
+static void lb_stats_refresh(struct work_struct *work)
+{
+ struct team *team;
+ struct lb_priv *lb_priv;
+ struct lb_priv_ex *lb_priv_ex;
+ struct lb_pcpu_stats *pcpu_stats;
+ struct lb_stats *stats;
+ struct lb_stats_info *s_info;
+ struct team_port *port;
+ bool changed = false;
+ int i;
+ int j;
+
+ lb_priv_ex = container_of(work, struct lb_priv_ex,
+ stats.refresh_dw.work);
+
+ team = lb_priv_ex->team;
+ lb_priv = get_lb_priv(team);
+
+ if (!mutex_trylock(&team->lock)) {
+ schedule_delayed_work(&lb_priv_ex->stats.refresh_dw, 0);
+ return;
+ }
+
+ for (j = 0; j < LB_TX_HASHTABLE_SIZE; j++) {
+ s_info = &lb_priv->ex->stats.info[j];
+ __lb_stats_info_refresh_prepare(s_info);
+ for_each_possible_cpu(i) {
+ pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
+ stats = &pcpu_stats->hash_stats[j];
+ __lb_one_cpu_stats_add(&s_info->stats, stats,
+ &pcpu_stats->syncp);
+ }
+ changed |= __lb_stats_info_refresh_check(s_info, team);
+ }
+
+ list_for_each_entry(port, &team->port_list, list) {
+ struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
+
+ s_info = &lb_port_priv->stats_info;
+ __lb_stats_info_refresh_prepare(s_info);
+ for_each_possible_cpu(i) {
+ pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
+ stats = per_cpu_ptr(lb_port_priv->pcpu_stats, i);
+ __lb_one_cpu_stats_add(&s_info->stats, stats,
+ &pcpu_stats->syncp);
+ }
+ changed |= __lb_stats_info_refresh_check(s_info, team);
+ }
+
+ if (changed)
+ team_options_change_check(team);
+
+ schedule_delayed_work(&lb_priv_ex->stats.refresh_dw,
+ (lb_priv_ex->stats.refresh_interval * HZ) / 10);
+
+ mutex_unlock(&team->lock);
+}
+
+static int lb_stats_refresh_interval_get(struct team *team,
+ struct team_gsetter_ctx *ctx)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+
+ ctx->data.u32_val = lb_priv->ex->stats.refresh_interval;
+ return 0;
+}
+
+static int lb_stats_refresh_interval_set(struct team *team,
+ struct team_gsetter_ctx *ctx)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ unsigned int interval;
+
+ interval = ctx->data.u32_val;
+ if (lb_priv->ex->stats.refresh_interval == interval)
+ return 0;
+ lb_priv->ex->stats.refresh_interval = interval;
+ if (interval)
+ schedule_delayed_work(&lb_priv->ex->stats.refresh_dw, 0);
+ else
+ cancel_delayed_work(&lb_priv->ex->stats.refresh_dw);
+ return 0;
+}
+
+static const struct team_option lb_options[] = {
+ {
+ .name = "bpf_hash_func",
+ .type = TEAM_OPTION_TYPE_BINARY,
+ .getter = lb_bpf_func_get,
+ .setter = lb_bpf_func_set,
+ },
+ {
+ .name = "lb_tx_method",
+ .type = TEAM_OPTION_TYPE_STRING,
+ .getter = lb_tx_method_get,
+ .setter = lb_tx_method_set,
+ },
+ {
+ .name = "lb_tx_hash_to_port_mapping",
+ .array_size = LB_TX_HASHTABLE_SIZE,
+ .type = TEAM_OPTION_TYPE_U32,
+ .init = lb_tx_hash_to_port_mapping_init,
+ .getter = lb_tx_hash_to_port_mapping_get,
+ .setter = lb_tx_hash_to_port_mapping_set,
+ },
+ {
+ .name = "lb_hash_stats",
+ .array_size = LB_TX_HASHTABLE_SIZE,
+ .type = TEAM_OPTION_TYPE_BINARY,
+ .init = lb_hash_stats_init,
+ .getter = lb_hash_stats_get,
+ },
+ {
+ .name = "lb_port_stats",
+ .per_port = true,
+ .type = TEAM_OPTION_TYPE_BINARY,
+ .init = lb_port_stats_init,
+ .getter = lb_port_stats_get,
+ },
+ {
+ .name = "lb_stats_refresh_interval",
+ .type = TEAM_OPTION_TYPE_U32,
+ .getter = lb_stats_refresh_interval_get,
+ .setter = lb_stats_refresh_interval_set,
+ },
+};
+
+static int lb_init(struct team *team)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+ lb_select_tx_port_func_t *func;
+ int i, err;
+
+ /* set default tx port selector */
+ func = lb_select_tx_port_get_func("hash");
+ BUG_ON(!func);
+ rcu_assign_pointer(lb_priv->select_tx_port_func, func);
+
+ lb_priv->ex = kzalloc(sizeof(*lb_priv->ex), GFP_KERNEL);
+ if (!lb_priv->ex)
+ return -ENOMEM;
+ lb_priv->ex->team = team;
+
+ lb_priv->pcpu_stats = alloc_percpu(struct lb_pcpu_stats);
+ if (!lb_priv->pcpu_stats) {
+ err = -ENOMEM;
+ goto err_alloc_pcpu_stats;
+ }
+
+ for_each_possible_cpu(i) {
+ struct lb_pcpu_stats *team_lb_stats;
+ team_lb_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
+ u64_stats_init(&team_lb_stats->syncp);
+ }
+
+
+ INIT_DELAYED_WORK(&lb_priv->ex->stats.refresh_dw, lb_stats_refresh);
+
+ err = team_options_register(team, lb_options, ARRAY_SIZE(lb_options));
+ if (err)
+ goto err_options_register;
+ return 0;
+
+err_options_register:
+ free_percpu(lb_priv->pcpu_stats);
+err_alloc_pcpu_stats:
+ kfree(lb_priv->ex);
+ return err;
+}
+
+static void lb_exit(struct team *team)
+{
+ struct lb_priv *lb_priv = get_lb_priv(team);
+
+ team_options_unregister(team, lb_options,
+ ARRAY_SIZE(lb_options));
+ cancel_delayed_work_sync(&lb_priv->ex->stats.refresh_dw);
+ free_percpu(lb_priv->pcpu_stats);
+ kfree(lb_priv->ex);
+}
+
+static int lb_port_enter(struct team *team, struct team_port *port)
+{
+ struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
+
+ lb_port_priv->pcpu_stats = alloc_percpu(struct lb_stats);
+ if (!lb_port_priv->pcpu_stats)
+ return -ENOMEM;
+ return 0;
+}
+
+static void lb_port_leave(struct team *team, struct team_port *port)
+{
+ struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
+
+ free_percpu(lb_port_priv->pcpu_stats);
+}
+
+static void lb_port_disabled(struct team *team, struct team_port *port)
+{
+ lb_tx_hash_to_port_mapping_null_port(team, port);
+}
+
+static const struct team_mode_ops lb_mode_ops = {
+ .init = lb_init,
+ .exit = lb_exit,
+ .port_enter = lb_port_enter,
+ .port_leave = lb_port_leave,
+ .port_disabled = lb_port_disabled,
+ .transmit = lb_transmit,
+};
+
+static const struct team_mode lb_mode = {
+ .kind = "loadbalance",
+ .owner = THIS_MODULE,
+ .priv_size = sizeof(struct lb_priv),
+ .port_priv_size = sizeof(struct lb_port_priv),
+ .ops = &lb_mode_ops,
+};
+
+static int __init lb_init_module(void)
+{
+ return team_mode_register(&lb_mode);
+}
+
+static void __exit lb_cleanup_module(void)
+{
+ team_mode_unregister(&lb_mode);
+}
+
+module_init(lb_init_module);
+module_exit(lb_cleanup_module);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
+MODULE_DESCRIPTION("Load-balancing mode for team");
+MODULE_ALIAS("team-mode-loadbalance");
Code Review / kvmfornfv.git / blobdiff