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kcm: Add statistics and proc interfaces

Browse source 
This patch adds various counters for KCM. These include counters for
messages and bytes received or sent, as well as counters for number of
attached/unattached TCP sockets and other error or edge events.

The statistics are exposed via a proc interface. /proc/net/kcm provides
statistics per KCM socket and per psock (attached TCP sockets).
/proc/net/kcm_stats provides aggregate statistics.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2016-03-07 14:11:07 -08:00 committed by David S. Miller
parent ab7ac4eb98
commit cd6e111bf5
4 changed files with 597 additions and 1 deletions
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94
include/net/kcm.h
View file

@ -17,6 +17,42 @@
extern unsigned int kcm_net_id;
#define KCM_STATS_ADD(stat, count) ((stat) += (count))
#define KCM_STATS_INCR(stat) ((stat)++)
struct kcm_psock_stats {
unsigned long long rx_msgs;
unsigned long long rx_bytes;
unsigned long long tx_msgs;
unsigned long long tx_bytes;
unsigned int rx_aborts;
unsigned int rx_mem_fail;
unsigned int rx_need_more_hdr;
unsigned int rx_bad_hdr_len;
unsigned long long reserved;
unsigned long long unreserved;
unsigned int tx_aborts;
};
struct kcm_mux_stats {
unsigned long long rx_msgs;
unsigned long long rx_bytes;
unsigned long long tx_msgs;
unsigned long long tx_bytes;
unsigned int rx_ready_drops;
unsigned int tx_retries;
unsigned int psock_attach;
unsigned int psock_unattach_rsvd;
unsigned int psock_unattach;
};
struct kcm_stats {
unsigned long long rx_msgs;
unsigned long long rx_bytes;
unsigned long long tx_msgs;
unsigned long long tx_bytes;
};
struct kcm_tx_msg {
unsigned int sent;
unsigned int fragidx;
@ -41,6 +77,8 @@ struct kcm_sock {
u32 done : 1;
struct work_struct done_work;
struct kcm_stats stats;
/* Transmit */
struct kcm_psock *tx_psock;
struct work_struct tx_work;
@ -77,6 +115,8 @@ struct kcm_psock {
struct list_head psock_list;
struct kcm_psock_stats stats;
/* Receive */
struct sk_buff *rx_skb_head;
struct sk_buff **rx_skb_nextp;
@ -86,15 +126,21 @@ struct kcm_psock {
struct delayed_work rx_delayed_work;
struct bpf_prog *bpf_prog;
struct kcm_sock *rx_kcm;
unsigned long long saved_rx_bytes;
unsigned long long saved_rx_msgs;
/* Transmit */
struct kcm_sock *tx_kcm;
struct list_head psock_avail_list;
unsigned long long saved_tx_bytes;
unsigned long long saved_tx_msgs;
};
/* Per net MUX list */
struct kcm_net {
struct mutex mutex;
struct kcm_psock_stats aggregate_psock_stats;
struct kcm_mux_stats aggregate_mux_stats;
struct list_head mux_list;
int count;
};
@ -110,6 +156,9 @@ struct kcm_mux {
struct list_head psocks; /* List of all psocks on MUX */
int psocks_cnt; /* Total attached sockets */
struct kcm_mux_stats stats;
struct kcm_psock_stats aggregate_psock_stats;
/* Receive */
spinlock_t rx_lock ____cacheline_aligned_in_smp;
struct list_head kcm_rx_waiters; /* KCMs waiting for receiving */
@ -122,4 +171,49 @@ struct kcm_mux {
struct list_head kcm_tx_waiters; /* KCMs waiting for a TX psock */
};
#ifdef CONFIG_PROC_FS
int kcm_proc_init(void);
void kcm_proc_exit(void);
#else
static int kcm_proc_init(void) { return 0; }
static void kcm_proc_exit(void) { }
#endif
static inline void aggregate_psock_stats(struct kcm_psock_stats *stats,
struct kcm_psock_stats *agg_stats)
{
/* Save psock statistics in the mux when psock is being unattached. */
#define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += stats->_stat)
SAVE_PSOCK_STATS(rx_msgs);
SAVE_PSOCK_STATS(rx_bytes);
SAVE_PSOCK_STATS(rx_aborts);
SAVE_PSOCK_STATS(rx_mem_fail);
SAVE_PSOCK_STATS(rx_need_more_hdr);
SAVE_PSOCK_STATS(rx_bad_hdr_len);
SAVE_PSOCK_STATS(tx_msgs);
SAVE_PSOCK_STATS(tx_bytes);
SAVE_PSOCK_STATS(reserved);
SAVE_PSOCK_STATS(unreserved);
SAVE_PSOCK_STATS(tx_aborts);
#undef SAVE_PSOCK_STATS
}
static inline void aggregate_mux_stats(struct kcm_mux_stats *stats,
struct kcm_mux_stats *agg_stats)
{
/* Save psock statistics in the mux when psock is being unattached. */
#define SAVE_MUX_STATS(_stat) (agg_stats->_stat += stats->_stat)
SAVE_MUX_STATS(rx_msgs);
SAVE_MUX_STATS(rx_bytes);
SAVE_MUX_STATS(tx_msgs);
SAVE_MUX_STATS(tx_bytes);
SAVE_MUX_STATS(rx_ready_drops);
SAVE_MUX_STATS(psock_attach);
SAVE_MUX_STATS(psock_unattach_rsvd);
SAVE_MUX_STATS(psock_unattach);
#undef SAVE_MUX_STATS
}
#endif /* __NET_KCM_H_ */

2
net/kcm/Makefile
View file

@ -1,3 +1,3 @@
obj-$(CONFIG_AF_KCM) += kcm.o
kcm-y := kcmsock.o
kcm-y := kcmsock.o kcmproc.o

422
net/kcm/kcmproc.c Normal file
View file

@ -0,0 +1,422 @@
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/proc_fs.h>
#include <linux/rculist.h>
#include <linux/seq_file.h>
#include <linux/socket.h>
#include <net/inet_sock.h>
#include <net/kcm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/tcp.h>
#ifdef CONFIG_PROC_FS
struct kcm_seq_muxinfo {
char *name;
const struct file_operations *seq_fops;
const struct seq_operations seq_ops;
};
static struct kcm_mux *kcm_get_first(struct seq_file *seq)
{
struct net *net = seq_file_net(seq);
struct kcm_net *knet = net_generic(net, kcm_net_id);
return list_first_or_null_rcu(&knet->mux_list,
struct kcm_mux, kcm_mux_list);
}
static struct kcm_mux *kcm_get_next(struct kcm_mux *mux)
{
struct kcm_net *knet = mux->knet;
return list_next_or_null_rcu(&knet->mux_list, &mux->kcm_mux_list,
struct kcm_mux, kcm_mux_list);
}
static struct kcm_mux *kcm_get_idx(struct seq_file *seq, loff_t pos)
{
struct net *net = seq_file_net(seq);
struct kcm_net *knet = net_generic(net, kcm_net_id);
struct kcm_mux *m;
list_for_each_entry_rcu(m, &knet->mux_list, kcm_mux_list) {
if (!pos)
return m;
--pos;
}
return NULL;
}
static void *kcm_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
void *p;
if (v == SEQ_START_TOKEN)
p = kcm_get_first(seq);
else
p = kcm_get_next(v);
++*pos;
return p;
}
static void *kcm_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(rcu)
{
rcu_read_lock();
if (!*pos)
return SEQ_START_TOKEN;
else
return kcm_get_idx(seq, *pos - 1);
}
static void kcm_seq_stop(struct seq_file *seq, void *v)
__releases(rcu)
{
rcu_read_unlock();
}
struct kcm_proc_mux_state {
struct seq_net_private p;
int idx;
};
static int kcm_seq_open(struct inode *inode, struct file *file)
{
struct kcm_seq_muxinfo *muxinfo = PDE_DATA(inode);
int err;
err = seq_open_net(inode, file, &muxinfo->seq_ops,
sizeof(struct kcm_proc_mux_state));
if (err < 0)
return err;
return err;
}
static void kcm_format_mux_header(struct seq_file *seq)
{
struct net *net = seq_file_net(seq);
struct kcm_net *knet = net_generic(net, kcm_net_id);
seq_printf(seq,
"*** KCM statistics (%d MUX) ****\n",
knet->count);
seq_printf(seq,
"%-14s %-10s %-16s %-10s %-16s %-8s %-8s %-8s %-8s %s",
"Object",
"RX-Msgs",
"RX-Bytes",
"TX-Msgs",
"TX-Bytes",
"Recv-Q",
"Rmem",
"Send-Q",
"Smem",
"Status");
/* XXX: pdsts header stuff here */
seq_puts(seq, "\n");
}
static void kcm_format_sock(struct kcm_sock *kcm, struct seq_file *seq,
int i, int *len)
{
seq_printf(seq,
" kcm-%-7u %-10llu %-16llu %-10llu %-16llu %-8d %-8d %-8d %-8s ",
kcm->index,
kcm->stats.rx_msgs,
kcm->stats.rx_bytes,
kcm->stats.tx_msgs,
kcm->stats.tx_bytes,
kcm->sk.sk_receive_queue.qlen,
sk_rmem_alloc_get(&kcm->sk),
kcm->sk.sk_write_queue.qlen,
"-");
if (kcm->tx_psock)
seq_printf(seq, "Psck-%u ", kcm->tx_psock->index);
if (kcm->tx_wait)
seq_puts(seq, "TxWait ");
if (kcm->tx_wait_more)
seq_puts(seq, "WMore ");
if (kcm->rx_wait)
seq_puts(seq, "RxWait ");
seq_puts(seq, "\n");
}
static void kcm_format_psock(struct kcm_psock *psock, struct seq_file *seq,
int i, int *len)
{
seq_printf(seq,
" psock-%-5u %-10llu %-16llu %-10llu %-16llu %-8d %-8d %-8d %-8d ",
psock->index,
psock->stats.rx_msgs,
psock->stats.rx_bytes,
psock->stats.tx_msgs,
psock->stats.tx_bytes,
psock->sk->sk_receive_queue.qlen,
atomic_read(&psock->sk->sk_rmem_alloc),
psock->sk->sk_write_queue.qlen,
atomic_read(&psock->sk->sk_wmem_alloc));
if (psock->done)
seq_puts(seq, "Done ");
if (psock->tx_stopped)
seq_puts(seq, "TxStop ");
if (psock->rx_stopped)
seq_puts(seq, "RxStop ");
if (psock->tx_kcm)
seq_printf(seq, "Rsvd-%d ", psock->tx_kcm->index);
if (psock->ready_rx_msg)
seq_puts(seq, "RdyRx ");
seq_puts(seq, "\n");
}
static void
kcm_format_mux(struct kcm_mux *mux, loff_t idx, struct seq_file *seq)
{
int i, len;
struct kcm_sock *kcm;
struct kcm_psock *psock;
/* mux information */
seq_printf(seq,
"%-6s%-8s %-10llu %-16llu %-10llu %-16llu %-8s %-8s %-8s %-8s ",
"mux", "",
mux->stats.rx_msgs,
mux->stats.rx_bytes,
mux->stats.tx_msgs,
mux->stats.tx_bytes,
"-", "-", "-", "-");
seq_printf(seq, "KCMs: %d, Psocks %d\n",
mux->kcm_socks_cnt, mux->psocks_cnt);
/* kcm sock information */
i = 0;
spin_lock_bh(&mux->lock);
list_for_each_entry(kcm, &mux->kcm_socks, kcm_sock_list) {
kcm_format_sock(kcm, seq, i, &len);
i++;
}
i = 0;
list_for_each_entry(psock, &mux->psocks, psock_list) {
kcm_format_psock(psock, seq, i, &len);
i++;
}
spin_unlock_bh(&mux->lock);
}
static int kcm_seq_show(struct seq_file *seq, void *v)
{
struct kcm_proc_mux_state *mux_state;
mux_state = seq->private;
if (v == SEQ_START_TOKEN) {
mux_state->idx = 0;
kcm_format_mux_header(seq);
} else {
kcm_format_mux(v, mux_state->idx, seq);
mux_state->idx++;
}
return 0;
}
static const struct file_operations kcm_seq_fops = {
.owner = THIS_MODULE,
.open = kcm_seq_open,
.read = seq_read,
.llseek = seq_lseek,
};
static struct kcm_seq_muxinfo kcm_seq_muxinfo = {
.name = "kcm",
.seq_fops = &kcm_seq_fops,
.seq_ops = {
.show = kcm_seq_show,
.start = kcm_seq_start,
.next = kcm_seq_next,
.stop = kcm_seq_stop,
}
};
static int kcm_proc_register(struct net *net, struct kcm_seq_muxinfo *muxinfo)
{
struct proc_dir_entry *p;
int rc = 0;
p = proc_create_data(muxinfo->name, S_IRUGO, net->proc_net,
muxinfo->seq_fops, muxinfo);
if (!p)
rc = -ENOMEM;
return rc;
}
EXPORT_SYMBOL(kcm_proc_register);
static void kcm_proc_unregister(struct net *net,
struct kcm_seq_muxinfo *muxinfo)
{
remove_proc_entry(muxinfo->name, net->proc_net);
}
EXPORT_SYMBOL(kcm_proc_unregister);
static int kcm_stats_seq_show(struct seq_file *seq, void *v)
{
struct kcm_psock_stats psock_stats;
struct kcm_mux_stats mux_stats;
struct kcm_mux *mux;
struct kcm_psock *psock;
struct net *net = seq->private;
struct kcm_net *knet = net_generic(net, kcm_net_id);
memset(&mux_stats, 0, sizeof(mux_stats));
memset(&psock_stats, 0, sizeof(psock_stats));
mutex_lock(&knet->mutex);
aggregate_mux_stats(&knet->aggregate_mux_stats, &mux_stats);
aggregate_psock_stats(&knet->aggregate_psock_stats,
&psock_stats);
list_for_each_entry_rcu(mux, &knet->mux_list, kcm_mux_list) {
spin_lock_bh(&mux->lock);
aggregate_mux_stats(&mux->stats, &mux_stats);
aggregate_psock_stats(&mux->aggregate_psock_stats,
&psock_stats);
list_for_each_entry(psock, &mux->psocks, psock_list)
aggregate_psock_stats(&psock->stats, &psock_stats);
spin_unlock_bh(&mux->lock);
}
mutex_unlock(&knet->mutex);
seq_printf(seq,
"%-8s %-10s %-16s %-10s %-16s %-10s %-10s %-10s %-10s %-10s\n",
"MUX",
"RX-Msgs",
"RX-Bytes",
"TX-Msgs",
"TX-Bytes",
"TX-Retries",
"Attach",
"Unattach",
"UnattchRsvd",
"RX-RdyDrops");
seq_printf(seq,
"%-8s %-10llu %-16llu %-10llu %-16llu %-10u %-10u %-10u %-10u %-10u\n",
"",
mux_stats.rx_msgs,
mux_stats.rx_bytes,
mux_stats.tx_msgs,
mux_stats.tx_bytes,
mux_stats.tx_retries,
mux_stats.psock_attach,
mux_stats.psock_unattach_rsvd,
mux_stats.psock_unattach,
mux_stats.rx_ready_drops);
seq_printf(seq,
"%-8s %-10s %-16s %-10s %-16s %-10s %-10s %-10s %-10s %-10s %-10s %-10s\n",
"Psock",
"RX-Msgs",
"RX-Bytes",
"TX-Msgs",
"TX-Bytes",
"Reserved",
"Unreserved",
"RX-Aborts",
"RX-MemFail",
"RX-NeedMor",
"RX-BadLen",
"TX-Aborts");
seq_printf(seq,
"%-8s %-10llu %-16llu %-10llu %-16llu %-10llu %-10llu %-10u %-10u %-10u %-10u %-10u\n",
"",
psock_stats.rx_msgs,
psock_stats.rx_bytes,
psock_stats.tx_msgs,
psock_stats.tx_bytes,
psock_stats.reserved,
psock_stats.unreserved,
psock_stats.rx_aborts,
psock_stats.rx_mem_fail,
psock_stats.rx_need_more_hdr,
psock_stats.rx_bad_hdr_len,
psock_stats.tx_aborts);
return 0;
}
static int kcm_stats_seq_open(struct inode *inode, struct file *file)
{
return single_open_net(inode, file, kcm_stats_seq_show);
}
static const struct file_operations kcm_stats_seq_fops = {
.owner = THIS_MODULE,
.open = kcm_stats_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release_net,
};
static int kcm_proc_init_net(struct net *net)
{
int err;
if (!proc_create("kcm_stats", S_IRUGO, net->proc_net,
&kcm_stats_seq_fops)) {
err = -ENOMEM;
goto out_kcm_stats;
}
err = kcm_proc_register(net, &kcm_seq_muxinfo);
if (err)
goto out_kcm;
return 0;
out_kcm:
remove_proc_entry("kcm_stats", net->proc_net);
out_kcm_stats:
return err;
}
static void kcm_proc_exit_net(struct net *net)
{
kcm_proc_unregister(net, &kcm_seq_muxinfo);
remove_proc_entry("kcm_stats", net->proc_net);
}
static struct pernet_operations kcm_net_ops = {
.init = kcm_proc_init_net,
.exit = kcm_proc_exit_net,
};
int __init kcm_proc_init(void)
{
return register_pernet_subsys(&kcm_net_ops);
}
void __exit kcm_proc_exit(void)
{
unregister_pernet_subsys(&kcm_net_ops);
}
#endif /* CONFIG_PROC_FS */

80
net/kcm/kcmsock.c
View file

@ -59,6 +59,7 @@ static void kcm_abort_rx_psock(struct kcm_psock *psock, int err,
return;
psock->rx_stopped = 1;
KCM_STATS_INCR(psock->stats.rx_aborts);
/* Report an error on the lower socket */
report_csk_error(csk, err);
@ -80,6 +81,7 @@ static void kcm_abort_tx_psock(struct kcm_psock *psock, int err,
}
psock->tx_stopped = 1;
KCM_STATS_INCR(psock->stats.tx_aborts);
if (!psock->tx_kcm) {
/* Take off psocks_avail list */
@ -101,6 +103,29 @@ static void kcm_abort_tx_psock(struct kcm_psock *psock, int err,
report_csk_error(csk, err);
}
/* RX mux lock held. */
static void kcm_update_rx_mux_stats(struct kcm_mux *mux,
struct kcm_psock *psock)
{
KCM_STATS_ADD(mux->stats.rx_bytes,
psock->stats.rx_bytes - psock->saved_rx_bytes);
mux->stats.rx_msgs +=
psock->stats.rx_msgs - psock->saved_rx_msgs;
psock->saved_rx_msgs = psock->stats.rx_msgs;
psock->saved_rx_bytes = psock->stats.rx_bytes;
}
static void kcm_update_tx_mux_stats(struct kcm_mux *mux,
struct kcm_psock *psock)
{
KCM_STATS_ADD(mux->stats.tx_bytes,
psock->stats.tx_bytes - psock->saved_tx_bytes);
mux->stats.tx_msgs +=
psock->stats.tx_msgs - psock->saved_tx_msgs;
psock->saved_tx_msgs = psock->stats.tx_msgs;
psock->saved_tx_bytes = psock->stats.tx_bytes;
}
static int kcm_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
/* KCM is ready to receive messages on its queue-- either the KCM is new or
@ -254,6 +279,8 @@ static struct kcm_sock *reserve_rx_kcm(struct kcm_psock *psock,
return psock->rx_kcm;
}
kcm_update_rx_mux_stats(mux, psock);
if (list_empty(&mux->kcm_rx_waiters)) {
psock->ready_rx_msg = head;
list_add_tail(&psock->psock_ready_list,
@ -356,10 +383,12 @@ static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
*/
orig_skb = skb_clone(orig_skb, GFP_ATOMIC);
if (!orig_skb) {
KCM_STATS_INCR(psock->stats.rx_mem_fail);
desc->error = -ENOMEM;
return 0;
}
if (!pskb_pull(orig_skb, orig_offset)) {
KCM_STATS_INCR(psock->stats.rx_mem_fail);
kfree_skb(orig_skb);
desc->error = -ENOMEM;
return 0;
@ -374,6 +403,7 @@ static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
*/
err = skb_unclone(head, GFP_ATOMIC);
if (err) {
KCM_STATS_INCR(psock->stats.rx_mem_fail);
desc->error = err;
return 0;
}
@ -392,6 +422,7 @@ static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
skb = alloc_skb(0, GFP_ATOMIC);
if (!skb) {
KCM_STATS_INCR(psock->stats.rx_mem_fail);
desc->error = -ENOMEM;
return 0;
}
@ -414,6 +445,7 @@ static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
/* Always clone since we will consume something */
skb = skb_clone(orig_skb, GFP_ATOMIC);
if (!skb) {
KCM_STATS_INCR(psock->stats.rx_mem_fail);
desc->error = -ENOMEM;
break;
}
@ -435,6 +467,7 @@ static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
*/
err = skb_unclone(skb, GFP_ATOMIC);
if (err) {
KCM_STATS_INCR(psock->stats.rx_mem_fail);
desc->error = err;
break;
}
@ -456,6 +489,7 @@ static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
/* Need more header to determine length */
rxm->accum_len += cand_len;
eaten += cand_len;
KCM_STATS_INCR(psock->stats.rx_need_more_hdr);
WARN_ON(eaten != orig_len);
break;
} else if (len <= (ssize_t)head->len -
@ -463,6 +497,7 @@ static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
/* Length must be into new skb (and also
* greater than zero)
*/
KCM_STATS_INCR(psock->stats.rx_bad_hdr_len);
desc->error = -EPROTO;
psock->rx_skb_head = NULL;
kcm_abort_rx_psock(psock, EPROTO, head);
@ -492,6 +527,7 @@ static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
/* Hurray, we have a new message! */
psock->rx_skb_head = NULL;
KCM_STATS_INCR(psock->stats.rx_msgs);
try_queue:
kcm = reserve_rx_kcm(psock, head);
@ -510,6 +546,8 @@ try_queue:
if (cloned_orig)
kfree_skb(orig_skb);
KCM_STATS_ADD(psock->stats.rx_bytes, eaten);
return eaten;
}
@ -671,6 +709,7 @@ static struct kcm_psock *reserve_psock(struct kcm_sock *kcm)
}
kcm->tx_psock = psock;
psock->tx_kcm = kcm;
KCM_STATS_INCR(psock->stats.reserved);
} else if (!kcm->tx_wait) {
list_add_tail(&kcm->wait_psock_list,
&mux->kcm_tx_waiters);
@ -705,6 +744,7 @@ static void psock_now_avail(struct kcm_psock *psock)
smp_mb();
kcm->tx_psock = psock;
KCM_STATS_INCR(psock->stats.reserved);
queue_work(kcm_wq, &kcm->tx_work);
}
}
@ -726,10 +766,13 @@ static void unreserve_psock(struct kcm_sock *kcm)
smp_rmb(); /* Read tx_psock before tx_wait */
kcm_update_tx_mux_stats(mux, psock);
WARN_ON(kcm->tx_wait);
kcm->tx_psock = NULL;
psock->tx_kcm = NULL;
KCM_STATS_INCR(psock->stats.unreserved);
if (unlikely(psock->tx_stopped)) {
if (psock->done) {
@ -753,6 +796,15 @@ static void unreserve_psock(struct kcm_sock *kcm)
spin_unlock_bh(&mux->lock);
}
static void kcm_report_tx_retry(struct kcm_sock *kcm)
{
struct kcm_mux *mux = kcm->mux;
spin_lock_bh(&mux->lock);
KCM_STATS_INCR(mux->stats.tx_retries);
spin_unlock_bh(&mux->lock);
}
/* Write any messages ready on the kcm socket. Called with kcm sock lock
* held. Return bytes actually sent or error.
*/
@ -773,6 +825,7 @@ static int kcm_write_msgs(struct kcm_sock *kcm)
* it and we'll retry the message.
*/
unreserve_psock(kcm);
kcm_report_tx_retry(kcm);
if (skb_queue_empty(&sk->sk_write_queue))
return 0;
@ -856,6 +909,7 @@ do_frag:
unreserve_psock(kcm);
txm->sent = 0;
kcm_report_tx_retry(kcm);
ret = 0;
goto try_again;
@ -863,6 +917,7 @@ do_frag:
sent += ret;
frag_offset += ret;
KCM_STATS_ADD(psock->stats.tx_bytes, ret);
if (frag_offset < frag->size) {
/* Not finished with this frag */
goto do_frag;
@ -884,6 +939,7 @@ do_frag:
kfree_skb(head);
sk->sk_wmem_queued -= sent;
total_sent += sent;
KCM_STATS_INCR(psock->stats.tx_msgs);
} while ((head = skb_peek(&sk->sk_write_queue)));
out:
if (!head) {
@ -1061,6 +1117,7 @@ wait_for_memory:
/* Message complete, queue it on send buffer */
__skb_queue_tail(&sk->sk_write_queue, head);
kcm->seq_skb = NULL;
KCM_STATS_INCR(kcm->stats.tx_msgs);
if (msg->msg_flags & MSG_BATCH) {
kcm->tx_wait_more = true;
@ -1083,6 +1140,8 @@ partial_message:
kcm_tx_msg(head)->last_skb = skb;
}
KCM_STATS_ADD(kcm->stats.tx_bytes, copied);
release_sock(sk);
return copied;
@ -1144,6 +1203,7 @@ static int kcm_recvmsg(struct socket *sock, struct msghdr *msg,
size_t len, int flags)
{
struct sock *sk = sock->sk;
struct kcm_sock *kcm = kcm_sk(sk);
int err = 0;
long timeo;
struct kcm_rx_msg *rxm;
@ -1171,6 +1231,7 @@ static int kcm_recvmsg(struct socket *sock, struct msghdr *msg,
copied = len;
if (likely(!(flags & MSG_PEEK))) {
KCM_STATS_ADD(kcm->stats.rx_bytes, copied);
if (copied < rxm->full_len) {
if (sock->type == SOCK_DGRAM) {
/* Truncated message */
@ -1183,6 +1244,7 @@ static int kcm_recvmsg(struct socket *sock, struct msghdr *msg,
msg_finished:
/* Finished with message */
msg->msg_flags |= MSG_EOR;
KCM_STATS_INCR(kcm->stats.rx_msgs);
skb_unlink(skb, &sk->sk_receive_queue);
kfree_skb(skb);
}
@ -1394,6 +1456,7 @@ static int kcm_attach(struct socket *sock, struct socket *csock,
list_add(&psock->psock_list, head);
psock->index = index;
KCM_STATS_INCR(mux->stats.psock_attach);
mux->psocks_cnt++;
psock_now_avail(psock);
spin_unlock_bh(&mux->lock);
@ -1469,6 +1532,7 @@ static void kcm_unattach(struct kcm_psock *psock)
list_del(&psock->psock_ready_list);
kfree_skb(psock->ready_rx_msg);
psock->ready_rx_msg = NULL;
KCM_STATS_INCR(mux->stats.rx_ready_drops);
}
spin_unlock_bh(&mux->rx_lock);
@ -1485,11 +1549,16 @@ static void kcm_unattach(struct kcm_psock *psock)
spin_lock_bh(&mux->lock);
aggregate_psock_stats(&psock->stats, &mux->aggregate_psock_stats);
KCM_STATS_INCR(mux->stats.psock_unattach);
if (psock->tx_kcm) {
/* psock was reserved. Just mark it finished and we will clean
* up in the kcm paths, we need kcm lock which can not be
* acquired here.
*/
KCM_STATS_INCR(mux->stats.psock_unattach_rsvd);
spin_unlock_bh(&mux->lock);
/* We are unattaching a socket that is reserved. Abort the
@ -1717,6 +1786,9 @@ static void release_mux(struct kcm_mux *mux)
__skb_queue_purge(&mux->rx_hold_queue);
mutex_lock(&knet->mutex);
aggregate_mux_stats(&mux->stats, &knet->aggregate_mux_stats);
aggregate_psock_stats(&mux->aggregate_psock_stats,
&knet->aggregate_psock_stats);
list_del_rcu(&mux->kcm_mux_list);
knet->count--;
mutex_unlock(&knet->mutex);
@ -1979,8 +2051,15 @@ static int __init kcm_init(void)
if (err)
goto net_ops_fail;
err = kcm_proc_init();
if (err)
goto proc_init_fail;
return 0;
proc_init_fail:
unregister_pernet_device(&kcm_net_ops);
net_ops_fail:
sock_unregister(PF_KCM);
@ -1999,6 +2078,7 @@ fail:
static void __exit kcm_exit(void)
{
kcm_proc_exit();
unregister_pernet_device(&kcm_net_ops);
sock_unregister(PF_KCM);
proto_unregister(&kcm_proto);