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RDS: split out connection specific state from rds_connection to rds_conn_path

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In preparation for multipath RDS, split the rds_connection
structure into a base structure, and a per-path struct rds_conn_path.
The base structure tracks information and locks common to all
paths. The workqs for send/recv/shutdown etc are tracked per
rds_conn_path. Thus the workq callbacks now work with rds_conn_path.

This commit allows for one rds_conn_path per rds_connection, and will
be extended into multiple conn_paths in  subsequent commits.

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 09:44:26 -07:00
committed by David S. Miller
parent dcf1158b27
commit 0cb43965d4
19 changed files with 199 additions and 93 deletions
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92
net/rds/threads.c
View File

@@ -71,30 +71,30 @@
struct workqueue_struct *rds_wq;
EXPORT_SYMBOL_GPL(rds_wq);
void rds_connect_path_complete(struct rds_connection *conn, int curr)
void rds_connect_path_complete(struct rds_conn_path *cp, int curr)
{
if (!rds_conn_transition(conn, curr, RDS_CONN_UP)) {
if (!rds_conn_path_transition(cp, curr, RDS_CONN_UP)) {
printk(KERN_WARNING "%s: Cannot transition to state UP, "
"current state is %d\n",
__func__,
atomic_read(&conn->c_state));
rds_conn_drop(conn);
atomic_read(&cp->cp_state));
rds_conn_path_drop(cp);
return;
}
rdsdebug("conn %p for %pI4 to %pI4 complete\n",
conn, &conn->c_laddr, &conn->c_faddr);
cp->cp_conn, &cp->cp_conn->c_laddr, &cp->cp_conn->c_faddr);
conn->c_reconnect_jiffies = 0;
set_bit(0, &conn->c_map_queued);
queue_delayed_work(rds_wq, &conn->c_send_w, 0);
queue_delayed_work(rds_wq, &conn->c_recv_w, 0);
cp->cp_reconnect_jiffies = 0;
set_bit(0, &cp->cp_conn->c_map_queued);
queue_delayed_work(rds_wq, &cp->cp_send_w, 0);
queue_delayed_work(rds_wq, &cp->cp_recv_w, 0);
}
EXPORT_SYMBOL_GPL(rds_connect_path_complete);
void rds_connect_complete(struct rds_connection *conn)
{
rds_connect_path_complete(conn, RDS_CONN_CONNECTING);
rds_connect_path_complete(&conn->c_path[0], RDS_CONN_CONNECTING);
}
EXPORT_SYMBOL_GPL(rds_connect_complete);
@@ -116,46 +116,52 @@ EXPORT_SYMBOL_GPL(rds_connect_complete);
* We should *always* start with a random backoff; otherwise a broken connection
* will always take several iterations to be re-established.
*/
void rds_queue_reconnect(struct rds_connection *conn)
void rds_queue_reconnect(struct rds_conn_path *cp)
{
unsigned long rand;
struct rds_connection *conn = cp->cp_conn;
rdsdebug("conn %p for %pI4 to %pI4 reconnect jiffies %lu\n",
conn, &conn->c_laddr, &conn->c_faddr,
conn->c_reconnect_jiffies);
cp->cp_reconnect_jiffies);
set_bit(RDS_RECONNECT_PENDING, &conn->c_flags);
if (conn->c_reconnect_jiffies == 0) {
conn->c_reconnect_jiffies = rds_sysctl_reconnect_min_jiffies;
queue_delayed_work(rds_wq, &conn->c_conn_w, 0);
set_bit(RDS_RECONNECT_PENDING, &cp->cp_flags);
if (cp->cp_reconnect_jiffies == 0) {
cp->cp_reconnect_jiffies = rds_sysctl_reconnect_min_jiffies;
queue_delayed_work(rds_wq, &cp->cp_conn_w, 0);
return;
}
get_random_bytes(&rand, sizeof(rand));
rdsdebug("%lu delay %lu ceil conn %p for %pI4 -> %pI4\n",
rand % conn->c_reconnect_jiffies, conn->c_reconnect_jiffies,
rand % cp->cp_reconnect_jiffies, cp->cp_reconnect_jiffies,
conn, &conn->c_laddr, &conn->c_faddr);
queue_delayed_work(rds_wq, &conn->c_conn_w,
rand % conn->c_reconnect_jiffies);
queue_delayed_work(rds_wq, &cp->cp_conn_w,
rand % cp->cp_reconnect_jiffies);
conn->c_reconnect_jiffies = min(conn->c_reconnect_jiffies * 2,
cp->cp_reconnect_jiffies = min(cp->cp_reconnect_jiffies * 2,
rds_sysctl_reconnect_max_jiffies);
}
void rds_connect_worker(struct work_struct *work)
{
struct rds_connection *conn = container_of(work, struct rds_connection, c_conn_w.work);
struct rds_conn_path *cp = container_of(work,
struct rds_conn_path,
cp_conn_w.work);
struct rds_connection *conn = cp->cp_conn;
int ret;
clear_bit(RDS_RECONNECT_PENDING, &conn->c_flags);
if (rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
clear_bit(RDS_RECONNECT_PENDING, &cp->cp_flags);
if (rds_conn_path_transition(cp, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
ret = conn->c_trans->conn_connect(conn);
rdsdebug("conn %p for %pI4 to %pI4 dispatched, ret %d\n",
conn, &conn->c_laddr, &conn->c_faddr, ret);
if (ret) {
if (rds_conn_transition(conn, RDS_CONN_CONNECTING, RDS_CONN_DOWN))
rds_queue_reconnect(conn);
if (rds_conn_path_transition(cp,
RDS_CONN_CONNECTING,
RDS_CONN_DOWN))
rds_queue_reconnect(cp);
else
rds_conn_error(conn, "RDS: connect failed\n");
}
@@ -164,22 +170,24 @@ void rds_connect_worker(struct work_struct *work)
void rds_send_worker(struct work_struct *work)
{
struct rds_connection *conn = container_of(work, struct rds_connection, c_send_w.work);
struct rds_conn_path *cp = container_of(work,
struct rds_conn_path,
cp_send_w.work);
int ret;
if (rds_conn_state(conn) == RDS_CONN_UP) {
clear_bit(RDS_LL_SEND_FULL, &conn->c_flags);
ret = rds_send_xmit(conn);
if (rds_conn_path_state(cp) == RDS_CONN_UP) {
clear_bit(RDS_LL_SEND_FULL, &cp->cp_flags);
ret = rds_send_xmit(cp->cp_conn);
cond_resched();
rdsdebug("conn %p ret %d\n", conn, ret);
rdsdebug("conn %p ret %d\n", cp->cp_conn, ret);
switch (ret) {
case -EAGAIN:
rds_stats_inc(s_send_immediate_retry);
queue_delayed_work(rds_wq, &conn->c_send_w, 0);
queue_delayed_work(rds_wq, &cp->cp_send_w, 0);
break;
case -ENOMEM:
rds_stats_inc(s_send_delayed_retry);
queue_delayed_work(rds_wq, &conn->c_send_w, 2);
queue_delayed_work(rds_wq, &cp->cp_send_w, 2);
default:
break;
}
@@ -188,20 +196,22 @@ void rds_send_worker(struct work_struct *work)
void rds_recv_worker(struct work_struct *work)
{
struct rds_connection *conn = container_of(work, struct rds_connection, c_recv_w.work);
struct rds_conn_path *cp = container_of(work,
struct rds_conn_path,
cp_recv_w.work);
int ret;
if (rds_conn_state(conn) == RDS_CONN_UP) {
ret = conn->c_trans->recv(conn);
rdsdebug("conn %p ret %d\n", conn, ret);
if (rds_conn_path_state(cp) == RDS_CONN_UP) {
ret = cp->cp_conn->c_trans->recv(cp->cp_conn);
rdsdebug("conn %p ret %d\n", cp->cp_conn, ret);
switch (ret) {
case -EAGAIN:
rds_stats_inc(s_recv_immediate_retry);
queue_delayed_work(rds_wq, &conn->c_recv_w, 0);
queue_delayed_work(rds_wq, &cp->cp_recv_w, 0);
break;
case -ENOMEM:
rds_stats_inc(s_recv_delayed_retry);
queue_delayed_work(rds_wq, &conn->c_recv_w, 2);
queue_delayed_work(rds_wq, &cp->cp_recv_w, 2);
default:
break;
}
@@ -210,9 +220,11 @@ void rds_recv_worker(struct work_struct *work)
void rds_shutdown_worker(struct work_struct *work)
{
struct rds_connection *conn = container_of(work, struct rds_connection, c_down_w);
struct rds_conn_path *cp = container_of(work,
struct rds_conn_path,
cp_down_w);
rds_conn_shutdown(conn);
rds_conn_shutdown(cp->cp_conn);
}
void rds_threads_exit(void)