diff options
author | Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2016-06-13 09:44:26 -0700 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2016-06-14 23:50:41 -0700 |
commit | 0cb43965d42a21a7af41f88f1021b478dc102425 (patch) | |
tree | 628e5ac505d94dd9cf1f2551737d9139eb58662f /net/rds/rds.h | |
parent | dcf1158b275f9d51d6a742cf7166edc764ee4718 (diff) | |
download | linux-stable-0cb43965d42a21a7af41f88f1021b478dc102425.tar.gz linux-stable-0cb43965d42a21a7af41f88f1021b478dc102425.tar.bz2 linux-stable-0cb43965d42a21a7af41f88f1021b478dc102425.zip |
RDS: split out connection specific state from rds_connection to rds_conn_path
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>
Diffstat (limited to 'net/rds/rds.h')
-rw-r--r-- | net/rds/rds.h | 122 |
1 files changed, 80 insertions, 42 deletions
diff --git a/net/rds/rds.h b/net/rds/rds.h index 387df5f32e49..ca31a07f70f5 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -84,56 +84,69 @@ enum { #define RDS_IN_XMIT 2 #define RDS_RECV_REFILL 3 +/* Max number of multipaths per RDS connection. Must be a power of 2 */ +#define RDS_MPATH_WORKERS 1 + +/* Per mpath connection state */ +struct rds_conn_path { + struct rds_connection *cp_conn; + struct rds_message *cp_xmit_rm; + unsigned long cp_xmit_sg; + unsigned int cp_xmit_hdr_off; + unsigned int cp_xmit_data_off; + unsigned int cp_xmit_atomic_sent; + unsigned int cp_xmit_rdma_sent; + unsigned int cp_xmit_data_sent; + + spinlock_t cp_lock; /* protect msg queues */ + u64 cp_next_tx_seq; + struct list_head cp_send_queue; + struct list_head cp_retrans; + + u64 cp_next_rx_seq; + + void *cp_transport_data; + + atomic_t cp_state; + unsigned long cp_send_gen; + unsigned long cp_flags; + unsigned long cp_reconnect_jiffies; + struct delayed_work cp_send_w; + struct delayed_work cp_recv_w; + struct delayed_work cp_conn_w; + struct work_struct cp_down_w; + struct mutex cp_cm_lock; /* protect cp_state & cm */ + wait_queue_head_t cp_waitq; + + unsigned int cp_unacked_packets; + unsigned int cp_unacked_bytes; + unsigned int cp_outgoing:1, + cp_pad_to_32:31; + unsigned int cp_index; +}; + +/* One rds_connection per RDS address pair */ struct rds_connection { struct hlist_node c_hash_node; __be32 c_laddr; __be32 c_faddr; unsigned int c_loopback:1, - c_outgoing:1, - c_pad_to_32:30; + c_pad_to_32:31; + int c_npaths; struct rds_connection *c_passive; + struct rds_transport *c_trans; struct rds_cong_map *c_lcong; struct rds_cong_map *c_fcong; - struct rds_message *c_xmit_rm; - unsigned long c_xmit_sg; - unsigned int c_xmit_hdr_off; - unsigned int c_xmit_data_off; - unsigned int c_xmit_atomic_sent; - unsigned int c_xmit_rdma_sent; - unsigned int c_xmit_data_sent; - - spinlock_t c_lock; /* protect msg queues */ - u64 c_next_tx_seq; - struct list_head c_send_queue; - struct list_head c_retrans; - - u64 c_next_rx_seq; - - struct rds_transport *c_trans; - void *c_transport_data; - - atomic_t c_state; - unsigned long c_send_gen; - unsigned long c_flags; - unsigned long c_reconnect_jiffies; - struct delayed_work c_send_w; - struct delayed_work c_recv_w; - struct delayed_work c_conn_w; - struct work_struct c_down_w; - struct mutex c_cm_lock; /* protect conn state & cm */ - wait_queue_head_t c_waitq; + /* Protocol version */ + unsigned int c_version; + possible_net_t c_net; struct list_head c_map_item; unsigned long c_map_queued; - unsigned int c_unacked_packets; - unsigned int c_unacked_bytes; - - /* Protocol version */ - unsigned int c_version; - possible_net_t c_net; + struct rds_conn_path c_path[RDS_MPATH_WORKERS]; }; static inline @@ -639,6 +652,7 @@ struct rds_connection *rds_conn_create_outgoing(struct net *net, void rds_conn_shutdown(struct rds_connection *conn); void rds_conn_destroy(struct rds_connection *conn); void rds_conn_drop(struct rds_connection *conn); +void rds_conn_path_drop(struct rds_conn_path *cpath); void rds_conn_connect_if_down(struct rds_connection *conn); void rds_for_each_conn_info(struct socket *sock, unsigned int len, struct rds_info_iterator *iter, @@ -651,27 +665,51 @@ void __rds_conn_error(struct rds_connection *conn, const char *, ...); __rds_conn_error(conn, KERN_WARNING "RDS: " fmt) static inline int +rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) +{ + return atomic_cmpxchg(&cp->cp_state, old, new) == old; +} + +static inline int rds_conn_transition(struct rds_connection *conn, int old, int new) { - return atomic_cmpxchg(&conn->c_state, old, new) == old; + return rds_conn_path_transition(&conn->c_path[0], old, new); +} + +static inline int +rds_conn_path_state(struct rds_conn_path *cp) +{ + return atomic_read(&cp->cp_state); } static inline int rds_conn_state(struct rds_connection *conn) { - return atomic_read(&conn->c_state); + return rds_conn_path_state(&conn->c_path[0]); +} + +static inline int +rds_conn_path_up(struct rds_conn_path *cp) +{ + return atomic_read(&cp->cp_state) == RDS_CONN_UP; } static inline int rds_conn_up(struct rds_connection *conn) { - return atomic_read(&conn->c_state) == RDS_CONN_UP; + return rds_conn_path_up(&conn->c_path[0]); +} + +static inline int +rds_conn_path_connecting(struct rds_conn_path *cp) +{ + return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; } static inline int rds_conn_connecting(struct rds_connection *conn) { - return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING; + return rds_conn_path_connecting(&conn->c_path[0]); } /* message.c */ @@ -809,12 +847,12 @@ extern unsigned int rds_sysctl_trace_level; int rds_threads_init(void); void rds_threads_exit(void); extern struct workqueue_struct *rds_wq; -void rds_queue_reconnect(struct rds_connection *conn); +void rds_queue_reconnect(struct rds_conn_path *cp); void rds_connect_worker(struct work_struct *); void rds_shutdown_worker(struct work_struct *); void rds_send_worker(struct work_struct *); void rds_recv_worker(struct work_struct *); -void rds_connect_path_complete(struct rds_connection *conn, int curr); +void rds_connect_path_complete(struct rds_conn_path *conn, int curr); void rds_connect_complete(struct rds_connection *conn); /* transport.c */ |