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RDS: update rds-info related functions to traverse multiple conn_paths

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This commit updates the callbacks related to the rds-info command
so that they walk through all the rds_conn_path structures and
report the requested info.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sowmini Varadhan 2016-06-13 09:44:38 -07:00 committed by David S. Miller
parent 3c0a59001a
commit 992c9ec5fe
1 changed files with 80 additions and 25 deletions
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105
net/rds/connection.c
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@ -400,6 +400,7 @@ static void rds_conn_message_info(struct socket *sock, unsigned int len,
unsigned int total = 0;
unsigned long flags;
size_t i;
int j;
len /= sizeof(struct rds_info_message);
@ -408,23 +409,32 @@ static void rds_conn_message_info(struct socket *sock, unsigned int len,
for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash);
i++, head++) {
hlist_for_each_entry_rcu(conn, head, c_hash_node) {
if (want_send)
list = &conn->c_send_queue;
else
list = &conn->c_retrans;
struct rds_conn_path *cp;
spin_lock_irqsave(&conn->c_lock, flags);
for (j = 0; j < RDS_MPATH_WORKERS; j++) {
cp = &conn->c_path[j];
if (want_send)
list = &cp->cp_send_queue;
else
list = &cp->cp_retrans;
/* XXX too lazy to maintain counts.. */
list_for_each_entry(rm, list, m_conn_item) {
total++;
if (total <= len)
rds_inc_info_copy(&rm->m_inc, iter,
conn->c_laddr,
conn->c_faddr, 0);
spin_lock_irqsave(&cp->cp_lock, flags);
/* XXX too lazy to maintain counts.. */
list_for_each_entry(rm, list, m_conn_item) {
total++;
if (total <= len)
rds_inc_info_copy(&rm->m_inc,
iter,
conn->c_laddr,
conn->c_faddr,
0);
}
spin_unlock_irqrestore(&cp->cp_lock, flags);
if (!conn->c_trans->t_mp_capable)
break;
}
spin_unlock_irqrestore(&conn->c_lock, flags);
}
}
rcu_read_unlock();
@ -486,27 +496,72 @@ void rds_for_each_conn_info(struct socket *sock, unsigned int len,
}
EXPORT_SYMBOL_GPL(rds_for_each_conn_info);
static int rds_conn_info_visitor(struct rds_connection *conn,
void *buffer)
void rds_walk_conn_path_info(struct socket *sock, unsigned int len,
struct rds_info_iterator *iter,
struct rds_info_lengths *lens,
int (*visitor)(struct rds_conn_path *, void *),
size_t item_len)
{
u64 buffer[(item_len + 7) / 8];
struct hlist_head *head;
struct rds_connection *conn;
size_t i;
int j;
rcu_read_lock();
lens->nr = 0;
lens->each = item_len;
for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash);
i++, head++) {
hlist_for_each_entry_rcu(conn, head, c_hash_node) {
struct rds_conn_path *cp;
for (j = 0; j < RDS_MPATH_WORKERS; j++) {
cp = &conn->c_path[j];
/* XXX no cp_lock usage.. */
if (!visitor(cp, buffer))
continue;
if (!conn->c_trans->t_mp_capable)
break;
}
/* We copy as much as we can fit in the buffer,
* but we count all items so that the caller
* can resize the buffer.
*/
if (len >= item_len) {
rds_info_copy(iter, buffer, item_len);
len -= item_len;
}
lens->nr++;
}
}
rcu_read_unlock();
}
static int rds_conn_info_visitor(struct rds_conn_path *cp, void *buffer)
{
struct rds_info_connection *cinfo = buffer;
cinfo->next_tx_seq = conn->c_next_tx_seq;
cinfo->next_rx_seq = conn->c_next_rx_seq;
cinfo->laddr = conn->c_laddr;
cinfo->faddr = conn->c_faddr;
strncpy(cinfo->transport, conn->c_trans->t_name,
cinfo->next_tx_seq = cp->cp_next_tx_seq;
cinfo->next_rx_seq = cp->cp_next_rx_seq;
cinfo->laddr = cp->cp_conn->c_laddr;
cinfo->faddr = cp->cp_conn->c_faddr;
strncpy(cinfo->transport, cp->cp_conn->c_trans->t_name,
sizeof(cinfo->transport));
cinfo->flags = 0;
rds_conn_info_set(cinfo->flags, test_bit(RDS_IN_XMIT, &conn->c_flags),
rds_conn_info_set(cinfo->flags, test_bit(RDS_IN_XMIT, &cp->cp_flags),
SENDING);
/* XXX Future: return the state rather than these funky bits */
rds_conn_info_set(cinfo->flags,
atomic_read(&conn->c_state) == RDS_CONN_CONNECTING,
atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING,
CONNECTING);
rds_conn_info_set(cinfo->flags,
atomic_read(&conn->c_state) == RDS_CONN_UP,
atomic_read(&cp->cp_state) == RDS_CONN_UP,
CONNECTED);
return 1;
}
@ -515,7 +570,7 @@ static void rds_conn_info(struct socket *sock, unsigned int len,
struct rds_info_iterator *iter,
struct rds_info_lengths *lens)
{
rds_for_each_conn_info(sock, len, iter, lens,
rds_walk_conn_path_info(sock, len, iter, lens,
rds_conn_info_visitor,
sizeof(struct rds_info_connection));
}