// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* drivers/net/team/team_mode_loadbalance.c - Load-balancing mode for team
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* Copyright (c) 2012 Jiri Pirko <jpirko@redhat.com>
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*/
|
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/filter.h>
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#include <linux/if_team.h>
|
|
static rx_handler_result_t lb_receive(struct team *team, struct team_port *port,
|
struct sk_buff *skb)
|
{
|
if (unlikely(skb->protocol == htons(ETH_P_SLOW))) {
|
/* LACPDU packets should go to exact delivery */
|
const unsigned char *dest = eth_hdr(skb)->h_dest;
|
|
if (is_link_local_ether_addr(dest) && dest[5] == 0x02)
|
return RX_HANDLER_EXACT;
|
}
|
return RX_HANDLER_ANOTHER;
|
}
|
|
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];
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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 */
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static struct team_port *lb_htpm_select_tx_port(struct team *team,
|
struct lb_priv *lb_priv,
|
struct sk_buff *skb,
|
unsigned char hash)
|
{
|
struct team_port *port;
|
|
port = rcu_dereference_bh(LB_HTPM_PORT_BY_HASH(lb_priv, hash));
|
if (likely(port))
|
return port;
|
/* If no valid port in the table, fall back to simple hash */
|
return lb_hash_select_tx_port(team, lb_priv, skb, 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;
|
}
|
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static unsigned int lb_get_skb_hash(struct lb_priv *lb_priv,
|
struct sk_buff *skb)
|
{
|
struct bpf_prog *fp;
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uint32_t lhash;
|
unsigned char *c;
|
|
fp = rcu_dereference_bh(lb_priv->fp);
|
if (unlikely(!fp))
|
return 0;
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lhash = BPF_PROG_RUN(fp, skb);
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c = (char *) &lhash;
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return c[0] ^ c[1] ^ c[2] ^ c[3];
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}
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static void lb_update_tx_stats(unsigned int tx_bytes, struct lb_priv *lb_priv,
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struct lb_port_priv *lb_port_priv,
|
unsigned char hash)
|
{
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struct lb_pcpu_stats *pcpu_stats;
|
struct lb_stats *port_stats;
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struct lb_stats *hash_stats;
|
|
pcpu_stats = this_cpu_ptr(lb_priv->pcpu_stats);
|
port_stats = this_cpu_ptr(lb_port_priv->pcpu_stats);
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hash_stats = &pcpu_stats->hash_stats[hash];
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u64_stats_update_begin(&pcpu_stats->syncp);
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port_stats->tx_bytes += tx_bytes;
|
hash_stats->tx_bytes += tx_bytes;
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u64_stats_update_end(&pcpu_stats->syncp);
|
}
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static bool lb_transmit(struct team *team, struct sk_buff *skb)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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lb_select_tx_port_func_t *select_tx_port_func;
|
struct team_port *port;
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unsigned char hash;
|
unsigned int tx_bytes = skb->len;
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hash = lb_get_skb_hash(lb_priv, skb);
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select_tx_port_func = rcu_dereference_bh(lb_priv->select_tx_port_func);
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port = select_tx_port_func(team, lb_priv, skb, hash);
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if (unlikely(!port))
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goto drop;
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if (team_dev_queue_xmit(team, port, skb))
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return false;
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lb_update_tx_stats(tx_bytes, lb_priv, get_lb_port_priv(port), hash);
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return true;
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drop:
|
dev_kfree_skb_any(skb);
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return false;
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}
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static int lb_bpf_func_get(struct team *team, struct team_gsetter_ctx *ctx)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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if (!lb_priv->ex->orig_fprog) {
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ctx->data.bin_val.len = 0;
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ctx->data.bin_val.ptr = NULL;
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return 0;
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}
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ctx->data.bin_val.len = lb_priv->ex->orig_fprog->len *
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sizeof(struct sock_filter);
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ctx->data.bin_val.ptr = lb_priv->ex->orig_fprog->filter;
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return 0;
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}
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static int __fprog_create(struct sock_fprog_kern **pfprog, u32 data_len,
|
const void *data)
|
{
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struct sock_fprog_kern *fprog;
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struct sock_filter *filter = (struct sock_filter *) data;
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if (data_len % sizeof(struct sock_filter))
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return -EINVAL;
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fprog = kmalloc(sizeof(*fprog), GFP_KERNEL);
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if (!fprog)
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return -ENOMEM;
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fprog->filter = kmemdup(filter, data_len, GFP_KERNEL);
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if (!fprog->filter) {
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kfree(fprog);
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return -ENOMEM;
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}
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fprog->len = data_len / sizeof(struct sock_filter);
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*pfprog = fprog;
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return 0;
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}
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static void __fprog_destroy(struct sock_fprog_kern *fprog)
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{
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kfree(fprog->filter);
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kfree(fprog);
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}
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static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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struct bpf_prog *fp = NULL;
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struct bpf_prog *orig_fp = NULL;
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struct sock_fprog_kern *fprog = NULL;
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int err;
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if (ctx->data.bin_val.len) {
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err = __fprog_create(&fprog, ctx->data.bin_val.len,
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ctx->data.bin_val.ptr);
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if (err)
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return err;
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err = bpf_prog_create(&fp, fprog);
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if (err) {
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__fprog_destroy(fprog);
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return err;
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}
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}
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if (lb_priv->ex->orig_fprog) {
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/* Clear old filter data */
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__fprog_destroy(lb_priv->ex->orig_fprog);
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orig_fp = rcu_dereference_protected(lb_priv->fp,
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lockdep_is_held(&team->lock));
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}
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rcu_assign_pointer(lb_priv->fp, fp);
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lb_priv->ex->orig_fprog = fprog;
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if (orig_fp) {
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synchronize_rcu();
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bpf_prog_destroy(orig_fp);
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}
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return 0;
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}
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static void lb_bpf_func_free(struct team *team)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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struct bpf_prog *fp;
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if (!lb_priv->ex->orig_fprog)
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return;
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__fprog_destroy(lb_priv->ex->orig_fprog);
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fp = rcu_dereference_protected(lb_priv->fp,
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lockdep_is_held(&team->lock));
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bpf_prog_destroy(fp);
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}
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static int lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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lb_select_tx_port_func_t *func;
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char *name;
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func = rcu_dereference_protected(lb_priv->select_tx_port_func,
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lockdep_is_held(&team->lock));
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name = lb_select_tx_port_get_name(func);
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BUG_ON(!name);
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ctx->data.str_val = name;
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return 0;
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}
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static int lb_tx_method_set(struct team *team, struct team_gsetter_ctx *ctx)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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lb_select_tx_port_func_t *func;
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func = lb_select_tx_port_get_func(ctx->data.str_val);
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if (!func)
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return -EINVAL;
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rcu_assign_pointer(lb_priv->select_tx_port_func, func);
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return 0;
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}
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static int lb_tx_hash_to_port_mapping_init(struct team *team,
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struct team_option_inst_info *info)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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unsigned char hash = info->array_index;
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LB_HTPM_OPT_INST_INFO_BY_HASH(lb_priv, hash) = info;
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return 0;
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}
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static int lb_tx_hash_to_port_mapping_get(struct team *team,
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struct team_gsetter_ctx *ctx)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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struct team_port *port;
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unsigned char hash = ctx->info->array_index;
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port = LB_HTPM_PORT_BY_HASH(lb_priv, hash);
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ctx->data.u32_val = port ? port->dev->ifindex : 0;
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return 0;
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}
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static int lb_tx_hash_to_port_mapping_set(struct team *team,
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struct team_gsetter_ctx *ctx)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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struct team_port *port;
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unsigned char hash = ctx->info->array_index;
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list_for_each_entry(port, &team->port_list, list) {
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if (ctx->data.u32_val == port->dev->ifindex &&
|
team_port_enabled(port)) {
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rcu_assign_pointer(LB_HTPM_PORT_BY_HASH(lb_priv, hash),
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port);
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return 0;
|
}
|
}
|
return -ENODEV;
|
}
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static int lb_hash_stats_init(struct team *team,
|
struct team_option_inst_info *info)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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unsigned char hash = info->array_index;
|
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lb_priv->ex->stats.info[hash].opt_inst_info = info;
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return 0;
|
}
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static int lb_hash_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
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{
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struct lb_priv *lb_priv = get_lb_priv(team);
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unsigned char hash = ctx->info->array_index;
|
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ctx->data.bin_val.ptr = &lb_priv->ex->stats.info[hash].stats;
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ctx->data.bin_val.len = sizeof(struct lb_stats);
|
return 0;
|
}
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static int lb_port_stats_init(struct team *team,
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struct team_option_inst_info *info)
|
{
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struct team_port *port = info->port;
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struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
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lb_port_priv->stats_info.opt_inst_info = info;
|
return 0;
|
}
|
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static int lb_port_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
|
{
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struct team_port *port = ctx->info->port;
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struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
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ctx->data.bin_val.ptr = &lb_port_priv->stats_info.stats;
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ctx->data.bin_val.len = sizeof(struct lb_stats);
|
return 0;
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}
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static void __lb_stats_info_refresh_prepare(struct lb_stats_info *s_info)
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{
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memcpy(&s_info->last_stats, &s_info->stats, sizeof(struct lb_stats));
|
memset(&s_info->stats, 0, sizeof(struct lb_stats));
|
}
|
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static bool __lb_stats_info_refresh_check(struct lb_stats_info *s_info,
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struct team *team)
|
{
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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;
|
}
|
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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));
|
lb_bpf_func_free(team);
|
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,
|
.receive = lb_receive,
|
.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,
|
.lag_tx_type = NETDEV_LAG_TX_TYPE_HASH,
|
};
|
|
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");
|
