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Date: Wed, 30 Dec 2015 23:50:48 +0800
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc: mleitner@...hat.com, vyasevic@...hat.com, daniel@...earbox.net,
davem@...emloft.net
Subject: [PATCH net-next 3/5] sctp: apply rhashtable api to sctp procfs
Traversal the transport rhashtable, get the association only once through
the condition assoc->peer.primary_path != transport.
Signed-off-by: Xin Long <lucien.xin@...il.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
---
net/sctp/proc.c | 316 +++++++++++++++++++++++++++++++-------------------------
1 file changed, 173 insertions(+), 143 deletions(-)
diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index 0697eda..dfa7eec 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -281,88 +281,136 @@ void sctp_eps_proc_exit(struct net *net)
remove_proc_entry("eps", net->sctp.proc_net_sctp);
}
+struct sctp_ht_iter {
+ struct seq_net_private p;
+ struct rhashtable_iter hti;
+};
-static void *sctp_assocs_seq_start(struct seq_file *seq, loff_t *pos)
+static struct sctp_transport *sctp_transport_get_next(struct seq_file *seq)
{
- if (*pos >= sctp_assoc_hashsize)
- return NULL;
+ struct sctp_ht_iter *iter = seq->private;
+ struct sctp_transport *t;
- if (*pos < 0)
- *pos = 0;
+ t = rhashtable_walk_next(&iter->hti);
+ for (; t; t = rhashtable_walk_next(&iter->hti)) {
+ if (IS_ERR(t)) {
+ if (PTR_ERR(t) == -EAGAIN)
+ continue;
+ break;
+ }
- if (*pos == 0)
- seq_printf(seq, " ASSOC SOCK STY SST ST HBKT "
- "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
- "RPORT LADDRS <-> RADDRS "
- "HBINT INS OUTS MAXRT T1X T2X RTXC "
- "wmema wmemq sndbuf rcvbuf\n");
+ if (net_eq(sock_net(t->asoc->base.sk), seq_file_net(seq)) &&
+ t->asoc->peer.primary_path == t)
+ break;
+ }
- return (void *)pos;
+ return t;
}
-static void sctp_assocs_seq_stop(struct seq_file *seq, void *v)
+static struct sctp_transport *sctp_transport_get_idx(struct seq_file *seq,
+ loff_t pos)
+{
+ void *obj;
+
+ while (pos && (obj = sctp_transport_get_next(seq)) && !IS_ERR(obj))
+ pos--;
+
+ return obj;
+}
+
+static int sctp_transport_walk_start(struct seq_file *seq)
{
+ struct sctp_ht_iter *iter = seq->private;
+ int err;
+
+ err = rhashtable_walk_init(&sctp_transport_hashtable, &iter->hti);
+ if (err)
+ return err;
+
+ err = rhashtable_walk_start(&iter->hti);
+
+ return err == -EAGAIN ? 0 : err;
}
+static void sctp_transport_walk_stop(struct seq_file *seq)
+{
+ struct sctp_ht_iter *iter = seq->private;
+
+ rhashtable_walk_stop(&iter->hti);
+ rhashtable_walk_exit(&iter->hti);
+}
+
+static void *sctp_assocs_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ int err = sctp_transport_walk_start(seq);
+
+ if (err)
+ return ERR_PTR(err);
+
+ return *pos ? sctp_transport_get_idx(seq, *pos) : SEQ_START_TOKEN;
+}
+
+static void sctp_assocs_seq_stop(struct seq_file *seq, void *v)
+{
+ sctp_transport_walk_stop(seq);
+}
static void *sctp_assocs_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- if (++*pos >= sctp_assoc_hashsize)
- return NULL;
+ ++*pos;
- return pos;
+ return sctp_transport_get_next(seq);
}
/* Display sctp associations (/proc/net/sctp/assocs). */
static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
{
- struct sctp_hashbucket *head;
- struct sctp_ep_common *epb;
+ struct sctp_transport *transport;
struct sctp_association *assoc;
+ struct sctp_ep_common *epb;
struct sock *sk;
- int hash = *(loff_t *)v;
-
- if (hash >= sctp_assoc_hashsize)
- return -ENOMEM;
- head = &sctp_assoc_hashtable[hash];
- local_bh_disable();
- read_lock(&head->lock);
- sctp_for_each_hentry(epb, &head->chain) {
- assoc = sctp_assoc(epb);
- sk = epb->sk;
- if (!net_eq(sock_net(sk), seq_file_net(seq)))
- continue;
- seq_printf(seq,
- "%8pK %8pK %-3d %-3d %-2d %-4d "
- "%4d %8d %8d %7u %5lu %-5d %5d ",
- assoc, sk, sctp_sk(sk)->type, sk->sk_state,
- assoc->state, hash,
- assoc->assoc_id,
- assoc->sndbuf_used,
- atomic_read(&assoc->rmem_alloc),
- from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
- sock_i_ino(sk),
- epb->bind_addr.port,
- assoc->peer.port);
- seq_printf(seq, " ");
- sctp_seq_dump_local_addrs(seq, epb);
- seq_printf(seq, "<-> ");
- sctp_seq_dump_remote_addrs(seq, assoc);
- seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d "
- "%8d %8d %8d %8d",
- assoc->hbinterval, assoc->c.sinit_max_instreams,
- assoc->c.sinit_num_ostreams, assoc->max_retrans,
- assoc->init_retries, assoc->shutdown_retries,
- assoc->rtx_data_chunks,
- atomic_read(&sk->sk_wmem_alloc),
- sk->sk_wmem_queued,
- sk->sk_sndbuf,
- sk->sk_rcvbuf);
- seq_printf(seq, "\n");
+ if (v == SEQ_START_TOKEN) {
+ seq_printf(seq, " ASSOC SOCK STY SST ST HBKT "
+ "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
+ "RPORT LADDRS <-> RADDRS "
+ "HBINT INS OUTS MAXRT T1X T2X RTXC "
+ "wmema wmemq sndbuf rcvbuf\n");
+ return 0;
}
- read_unlock(&head->lock);
- local_bh_enable();
+
+ transport = (struct sctp_transport *)v;
+ assoc = transport->asoc;
+ epb = &assoc->base;
+ sk = epb->sk;
+
+ seq_printf(seq,
+ "%8pK %8pK %-3d %-3d %-2d %-4d "
+ "%4d %8d %8d %7u %5lu %-5d %5d ",
+ assoc, sk, sctp_sk(sk)->type, sk->sk_state,
+ assoc->state, 0,
+ assoc->assoc_id,
+ assoc->sndbuf_used,
+ atomic_read(&assoc->rmem_alloc),
+ from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
+ sock_i_ino(sk),
+ epb->bind_addr.port,
+ assoc->peer.port);
+ seq_printf(seq, " ");
+ sctp_seq_dump_local_addrs(seq, epb);
+ seq_printf(seq, "<-> ");
+ sctp_seq_dump_remote_addrs(seq, assoc);
+ seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d "
+ "%8d %8d %8d %8d",
+ assoc->hbinterval, assoc->c.sinit_max_instreams,
+ assoc->c.sinit_num_ostreams, assoc->max_retrans,
+ assoc->init_retries, assoc->shutdown_retries,
+ assoc->rtx_data_chunks,
+ atomic_read(&sk->sk_wmem_alloc),
+ sk->sk_wmem_queued,
+ sk->sk_sndbuf,
+ sk->sk_rcvbuf);
+ seq_printf(seq, "\n");
return 0;
}
@@ -378,7 +426,7 @@ static const struct seq_operations sctp_assoc_ops = {
static int sctp_assocs_seq_open(struct inode *inode, struct file *file)
{
return seq_open_net(inode, file, &sctp_assoc_ops,
- sizeof(struct seq_net_private));
+ sizeof(struct sctp_ht_iter));
}
static const struct file_operations sctp_assocs_seq_fops = {
@@ -409,112 +457,94 @@ void sctp_assocs_proc_exit(struct net *net)
static void *sctp_remaddr_seq_start(struct seq_file *seq, loff_t *pos)
{
- if (*pos >= sctp_assoc_hashsize)
- return NULL;
-
- if (*pos < 0)
- *pos = 0;
+ int err = sctp_transport_walk_start(seq);
- if (*pos == 0)
- seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX "
- "REM_ADDR_RTX START STATE\n");
+ if (err)
+ return ERR_PTR(err);
- return (void *)pos;
+ return *pos ? sctp_transport_get_idx(seq, *pos) : SEQ_START_TOKEN;
}
static void *sctp_remaddr_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- if (++*pos >= sctp_assoc_hashsize)
- return NULL;
+ ++*pos;
- return pos;
+ return sctp_transport_get_next(seq);
}
static void sctp_remaddr_seq_stop(struct seq_file *seq, void *v)
{
+ sctp_transport_walk_stop(seq);
}
static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
{
- struct sctp_hashbucket *head;
- struct sctp_ep_common *epb;
struct sctp_association *assoc;
struct sctp_transport *tsp;
- int hash = *(loff_t *)v;
- if (hash >= sctp_assoc_hashsize)
- return -ENOMEM;
+ if (v == SEQ_START_TOKEN) {
+ seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX "
+ "REM_ADDR_RTX START STATE\n");
+ return 0;
+ }
- head = &sctp_assoc_hashtable[hash];
- local_bh_disable();
- read_lock(&head->lock);
- rcu_read_lock();
- sctp_for_each_hentry(epb, &head->chain) {
- if (!net_eq(sock_net(epb->sk), seq_file_net(seq)))
+ tsp = (struct sctp_transport *)v;
+ assoc = tsp->asoc;
+
+ list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
+ transports) {
+ if (tsp->dead)
continue;
- assoc = sctp_assoc(epb);
- list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
- transports) {
- if (tsp->dead)
- continue;
+ /*
+ * The remote address (ADDR)
+ */
+ tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr);
+ seq_printf(seq, " ");
+ /*
+ * The association ID (ASSOC_ID)
+ */
+ seq_printf(seq, "%d ", tsp->asoc->assoc_id);
+
+ /*
+ * If the Heartbeat is active (HB_ACT)
+ * Note: 1 = Active, 0 = Inactive
+ */
+ seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer));
+
+ /*
+ * Retransmit time out (RTO)
+ */
+ seq_printf(seq, "%lu ", tsp->rto);
+
+ /*
+ * Maximum path retransmit count (PATH_MAX_RTX)
+ */
+ seq_printf(seq, "%d ", tsp->pathmaxrxt);
+
+ /*
+ * remote address retransmit count (REM_ADDR_RTX)
+ * Note: We don't have a way to tally this at the moment
+ * so lets just leave it as zero for the moment
+ */
+ seq_puts(seq, "0 ");
+
+ /*
+ * remote address start time (START). This is also not
+ * currently implemented, but we can record it with a
+ * jiffies marker in a subsequent patch
+ */
+ seq_puts(seq, "0 ");
+
+ /*
+ * The current state of this destination. I.e.
+ * SCTP_ACTIVE, SCTP_INACTIVE, ...
+ */
+ seq_printf(seq, "%d", tsp->state);
- /*
- * The remote address (ADDR)
- */
- tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr);
- seq_printf(seq, " ");
-
- /*
- * The association ID (ASSOC_ID)
- */
- seq_printf(seq, "%d ", tsp->asoc->assoc_id);
-
- /*
- * If the Heartbeat is active (HB_ACT)
- * Note: 1 = Active, 0 = Inactive
- */
- seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer));
-
- /*
- * Retransmit time out (RTO)
- */
- seq_printf(seq, "%lu ", tsp->rto);
-
- /*
- * Maximum path retransmit count (PATH_MAX_RTX)
- */
- seq_printf(seq, "%d ", tsp->pathmaxrxt);
-
- /*
- * remote address retransmit count (REM_ADDR_RTX)
- * Note: We don't have a way to tally this at the moment
- * so lets just leave it as zero for the moment
- */
- seq_puts(seq, "0 ");
-
- /*
- * remote address start time (START). This is also not
- * currently implemented, but we can record it with a
- * jiffies marker in a subsequent patch
- */
- seq_puts(seq, "0 ");
-
- /*
- * The current state of this destination. I.e.
- * SCTP_ACTIVE, SCTP_INACTIVE, ...
- */
- seq_printf(seq, "%d", tsp->state);
-
- seq_printf(seq, "\n");
- }
+ seq_printf(seq, "\n");
}
- rcu_read_unlock();
- read_unlock(&head->lock);
- local_bh_enable();
-
return 0;
-
}
static const struct seq_operations sctp_remaddr_ops = {
@@ -533,7 +563,7 @@ void sctp_remaddr_proc_exit(struct net *net)
static int sctp_remaddr_seq_open(struct inode *inode, struct file *file)
{
return seq_open_net(inode, file, &sctp_remaddr_ops,
- sizeof(struct seq_net_private));
+ sizeof(struct sctp_ht_iter));
}
static const struct file_operations sctp_remaddr_seq_fops = {
--
2.1.0
--
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