These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

1 files changed, 103 insertions, 131 deletions

diff --git a/kernel/net/tipc/link.h b/kernel/net/tipc/link.h
index b5b4e3554..66d859b66 100644
--- a/kernel/net/tipc/link.h
+++ b/kernel/net/tipc/link.h
@@ -49,19 +49,26 @@
  */
 #define INVALID_LINK_SEQ 0x10000
 
-/* Link working states
+/* Link FSM events:
  */
-#define WORKING_WORKING 560810u
-#define WORKING_UNKNOWN 560811u
-#define RESET_UNKNOWN   560812u
-#define RESET_RESET     560813u
+enum {
+	LINK_ESTABLISH_EVT       = 0xec1ab1e,
+	LINK_PEER_RESET_EVT      = 0x9eed0e,
+	LINK_FAILURE_EVT         = 0xfa110e,
+	LINK_RESET_EVT           = 0x10ca1d0e,
+	LINK_FAILOVER_BEGIN_EVT  = 0xfa110bee,
+	LINK_FAILOVER_END_EVT    = 0xfa110ede,
+	LINK_SYNCH_BEGIN_EVT     = 0xc1ccbee,
+	LINK_SYNCH_END_EVT       = 0xc1ccede
+};
 
-/* Link endpoint execution states
+/* Events returned from link at packet reception or at timeout
  */
-#define LINK_STARTED     0x0001
-#define LINK_STOPPED     0x0002
-#define LINK_SYNCHING    0x0004
-#define LINK_FAILINGOVER 0x0008
+enum {
+	TIPC_LINK_UP_EVT       = 1,
+	TIPC_LINK_DOWN_EVT     = (1 << 1),
+	TIPC_LINK_SND_BC_ACK   = (1 << 2)
+};
 
 /* Starting value for maximum packet size negotiation on unicast links
  * (unless bearer MTU is less)
@@ -104,33 +111,34 @@ struct tipc_stats {
  * @name: link name character string
  * @media_addr: media address to use when sending messages over link
  * @timer: link timer
- * @owner: pointer to peer node
+ * @net: pointer to namespace struct
  * @refcnt: reference counter for permanent references (owner node & timer)
- * @flags: execution state flags for link endpoint instance
- * @checkpoint: reference point for triggering link continuity checking
  * @peer_session: link session # being used by peer end of link
  * @peer_bearer_id: bearer id used by link's peer endpoint
  * @bearer_id: local bearer id used by link
  * @tolerance: minimum link continuity loss needed to reset link [in ms]
- * @cont_intv: link continuity testing interval
+ * @keepalive_intv: link keepalive timer interval
  * @abort_limit: # of unacknowledged continuity probes needed to reset link
  * @state: current state of link FSM
- * @fsm_msg_cnt: # of protocol messages link FSM has sent in current state
+ * @peer_caps: bitmap describing capabilities of peer node
+ * @silent_intv_cnt: # of timer intervals without any reception from peer
  * @proto_msg: template for control messages generated by link
  * @pmsg: convenience pointer to "proto_msg" field
  * @priority: current link priority
  * @net_plane: current link network plane ('A' through 'H')
  * @backlog_limit: backlog queue congestion thresholds (indexed by importance)
  * @exp_msg_count: # of tunnelled messages expected during link changeover
- * @reset_checkpoint: seq # of last acknowledged message at time of link reset
+ * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
  * @mtu: current maximum packet size for this link
  * @advertised_mtu: advertised own mtu when link is being established
  * @transmitq: queue for sent, non-acked messages
  * @backlogq: queue for messages waiting to be sent
- * @next_out_no: next sequence number to use for outbound messages
+ * @snt_nxt: next sequence number to use for outbound messages
  * @last_retransmitted: sequence number of most recently retransmitted message
  * @stale_count: # of identical retransmit requests made by peer
- * @next_in_no: next sequence number to expect for inbound messages
+ * @ackers: # of peers that needs to ack each packet before it can be released
+ * @acked: # last packet acked by a certain peer. Used for broadcast.
+ * @rcv_nxt: next sequence number to expect for inbound messages
  * @deferred_queue: deferred queue saved OOS b'cast message received from node
  * @unacked_window: # of inbound messages rx'd without ack'ing back to peer
  * @inputq: buffer queue for messages to be delivered upwards
@@ -139,27 +147,26 @@ struct tipc_stats {
  * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate
  * @long_msg_seq_no: next identifier to use for outbound fragmented messages
  * @reasm_buf: head of partially reassembled inbound message fragments
+ * @bc_rcvr: marks that this is a broadcast receiver link
  * @stats: collects statistics regarding link activity
  */
 struct tipc_link {
 	u32 addr;
 	char name[TIPC_MAX_LINK_NAME];
-	struct tipc_media_addr media_addr;
-	struct timer_list timer;
-	struct tipc_node *owner;
-	struct kref ref;
+	struct tipc_media_addr *media_addr;
+	struct net *net;
 
 	/* Management and link supervision data */
-	unsigned int flags;
-	u32 checkpoint;
 	u32 peer_session;
 	u32 peer_bearer_id;
 	u32 bearer_id;
 	u32 tolerance;
-	unsigned long cont_intv;
+	unsigned long keepalive_intv;
 	u32 abort_limit;
-	int state;
-	u32 fsm_msg_cnt;
+	u32 state;
+	u16 peer_caps;
+	bool active;
+	u32 silent_intv_cnt;
 	struct {
 		unchar hdr[INT_H_SIZE];
 		unchar body[TIPC_MAX_IF_NAME];
@@ -167,12 +174,10 @@ struct tipc_link {
 	struct tipc_msg *pmsg;
 	u32 priority;
 	char net_plane;
-	u16 synch_point;
 
-	/* Failover */
-	u16 failover_pkts;
-	u16 failover_checkpt;
-	struct sk_buff *failover_skb;
+	/* Failover/synch */
+	u16 drop_point;
+	struct sk_buff *failover_reasm_skb;
 
 	/* Max packet negotiation */
 	u16 mtu;
@@ -185,17 +190,17 @@ struct tipc_link {
 		u16 len;
 		u16 limit;
 	} backlog[5];
-	u32 next_out_no;
-	u32 window;
-	u32 last_retransmitted;
+	u16 snd_nxt;
+	u16 last_retransm;
+	u16 window;
 	u32 stale_count;
 
 	/* Reception */
-	u32 next_in_no;
+	u16 rcv_nxt;
 	u32 rcv_unacked;
 	struct sk_buff_head deferdq;
-	struct sk_buff_head inputq;
-	struct sk_buff_head namedq;
+	struct sk_buff_head *inputq;
+	struct sk_buff_head *namedq;
 
 	/* Congestion handling */
 	struct sk_buff_head wakeupq;
@@ -203,109 +208,76 @@ struct tipc_link {
 	/* Fragmentation/reassembly */
 	struct sk_buff *reasm_buf;
 
+	/* Broadcast */
+	u16 ackers;
+	u16 acked;
+	struct tipc_link *bc_rcvlink;
+	struct tipc_link *bc_sndlink;
+	int nack_state;
+	bool bc_peer_is_up;
+
 	/* Statistics */
 	struct tipc_stats stats;
 };
 
-struct tipc_port;
-
-struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
-			      struct tipc_bearer *b_ptr,
-			      const struct tipc_media_addr *media_addr);
-void tipc_link_delete(struct tipc_link *link);
-void tipc_link_delete_list(struct net *net, unsigned int bearer_id,
-			   bool shutting_down);
-void tipc_link_failover_send_queue(struct tipc_link *l_ptr);
-void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, struct tipc_link *dest);
+bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
+		      int tolerance, char net_plane, u32 mtu, int priority,
+		      int window, u32 session, u32 ownnode, u32 peer,
+		      u16 peer_caps,
+		      struct tipc_link *bc_sndlink,
+		      struct tipc_link *bc_rcvlink,
+		      struct sk_buff_head *inputq,
+		      struct sk_buff_head *namedq,
+		      struct tipc_link **link);
+bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
+			 int mtu, int window, u16 peer_caps,
+			 struct sk_buff_head *inputq,
+			 struct sk_buff_head *namedq,
+			 struct tipc_link *bc_sndlink,
+			 struct tipc_link **link);
+void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
+			   int mtyp, struct sk_buff_head *xmitq);
+void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
+int tipc_link_fsm_evt(struct tipc_link *l, int evt);
 void tipc_link_reset_fragments(struct tipc_link *l_ptr);
-int tipc_link_is_up(struct tipc_link *l_ptr);
-int tipc_link_is_active(struct tipc_link *l_ptr);
-void tipc_link_purge_queues(struct tipc_link *l_ptr);
-void tipc_link_reset_all(struct tipc_node *node);
+bool tipc_link_is_up(struct tipc_link *l);
+bool tipc_link_peer_is_down(struct tipc_link *l);
+bool tipc_link_is_reset(struct tipc_link *l);
+bool tipc_link_is_establishing(struct tipc_link *l);
+bool tipc_link_is_synching(struct tipc_link *l);
+bool tipc_link_is_failingover(struct tipc_link *l);
+bool tipc_link_is_blocked(struct tipc_link *l);
+void tipc_link_set_active(struct tipc_link *l, bool active);
 void tipc_link_reset(struct tipc_link *l_ptr);
-void tipc_link_reset_list(struct net *net, unsigned int bearer_id);
-int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dest,
-		       u32 selector);
-int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dest,
-		   u32 selector);
-int __tipc_link_xmit(struct net *net, struct tipc_link *link,
-		     struct sk_buff_head *list);
-void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int prob,
-			  u32 gap, u32 tolerance, u32 priority);
-void tipc_link_push_packets(struct tipc_link *l_ptr);
-u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *buf);
-void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window);
-void tipc_link_retransmit(struct tipc_link *l_ptr,
-			  struct sk_buff *start, u32 retransmits);
-struct sk_buff *tipc_skb_queue_next(const struct sk_buff_head *list,
-				    const struct sk_buff *skb);
+int tipc_link_xmit(struct tipc_link *link,	struct sk_buff_head *list,
+		   struct sk_buff_head *xmitq);
+void tipc_link_set_queue_limits(struct tipc_link *l, u32 window);
 
 int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb);
 int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info);
 int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info);
 int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info);
 int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);
-void link_prepare_wakeup(struct tipc_link *l);
-
-/*
- * Link sequence number manipulation routines (uses modulo 2**16 arithmetic)
- */
-static inline u32 buf_seqno(struct sk_buff *buf)
-{
-	return msg_seqno(buf_msg(buf));
-}
-
-static inline u32 mod(u32 x)
-{
-	return x & 0xffffu;
-}
-
-static inline int less_eq(u32 left, u32 right)
-{
-	return mod(right - left) < 32768u;
-}
-
-static inline int more(u32 left, u32 right)
-{
-	return !less_eq(left, right);
-}
-
-static inline int less(u32 left, u32 right)
-{
-	return less_eq(left, right) && (mod(right) != mod(left));
-}
-
-static inline u32 lesser(u32 left, u32 right)
-{
-	return less_eq(left, right) ? left : right;
-}
-
-static inline u32 link_own_addr(struct tipc_link *l)
-{
-	return msg_prevnode(l->pmsg);
-}
-
-/*
- * Link status checking routines
- */
-static inline int link_working_working(struct tipc_link *l_ptr)
-{
-	return l_ptr->state == WORKING_WORKING;
-}
-
-static inline int link_working_unknown(struct tipc_link *l_ptr)
-{
-	return l_ptr->state == WORKING_UNKNOWN;
-}
-
-static inline int link_reset_unknown(struct tipc_link *l_ptr)
-{
-	return l_ptr->state == RESET_UNKNOWN;
-}
-
-static inline int link_reset_reset(struct tipc_link *l_ptr)
-{
-	return l_ptr->state == RESET_RESET;
-}
-
+int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq);
+int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
+		  struct sk_buff_head *xmitq);
+int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
+void tipc_link_add_bc_peer(struct tipc_link *snd_l,
+			   struct tipc_link *uc_l,
+			   struct sk_buff_head *xmitq);
+void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
+			      struct tipc_link *rcv_l,
+			      struct sk_buff_head *xmitq);
+int tipc_link_bc_peers(struct tipc_link *l);
+void tipc_link_set_mtu(struct tipc_link *l, int mtu);
+int tipc_link_mtu(struct tipc_link *l);
+void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
+			  struct sk_buff_head *xmitq);
+void tipc_link_build_bc_sync_msg(struct tipc_link *l,
+				 struct sk_buff_head *xmitq);
+void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr);
+void tipc_link_bc_sync_rcv(struct tipc_link *l,   struct tipc_msg *hdr,
+			   struct sk_buff_head *xmitq);
+int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
+			  struct sk_buff_head *xmitq);
 #endif