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, 130 insertions, 71 deletions

diff --git a/kernel/net/tipc/msg.c b/kernel/net/tipc/msg.c
index c3e96e815..8740930f0 100644
--- a/kernel/net/tipc/msg.c
+++ b/kernel/net/tipc/msg.c
@@ -121,7 +121,7 @@ int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf)
 {
 	struct sk_buff *head = *headbuf;
 	struct sk_buff *frag = *buf;
-	struct sk_buff *tail;
+	struct sk_buff *tail = NULL;
 	struct tipc_msg *msg;
 	u32 fragid;
 	int delta;
@@ -141,9 +141,15 @@ int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf)
 		if (unlikely(skb_unclone(frag, GFP_ATOMIC)))
 			goto err;
 		head = *headbuf = frag;
-		skb_frag_list_init(head);
-		TIPC_SKB_CB(head)->tail = NULL;
 		*buf = NULL;
+		TIPC_SKB_CB(head)->tail = NULL;
+		if (skb_is_nonlinear(head)) {
+			skb_walk_frags(head, tail) {
+				TIPC_SKB_CB(head)->tail = tail;
+			}
+		} else {
+			skb_frag_list_init(head);
+		}
 		return 0;
 	}
 
@@ -176,7 +182,6 @@ int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf)
 	*buf = NULL;
 	return 0;
 err:
-	pr_warn_ratelimited("Unable to build fragment list\n");
 	kfree_skb(*buf);
 	kfree_skb(*headbuf);
 	*buf = *headbuf = NULL;
@@ -331,16 +336,15 @@ error:
 
 /**
  * tipc_msg_bundle(): Append contents of a buffer to tail of an existing one
- * @bskb: the buffer to append to ("bundle")
- * @skb:  buffer to be appended
+ * @skb: the buffer to append to ("bundle")
+ * @msg:  message to be appended
  * @mtu:  max allowable size for the bundle buffer
  * Consumes buffer if successful
  * Returns true if bundling could be performed, otherwise false
  */
-bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu)
+bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu)
 {
 	struct tipc_msg *bmsg;
-	struct tipc_msg *msg = buf_msg(skb);
 	unsigned int bsz;
 	unsigned int msz = msg_size(msg);
 	u32 start, pad;
@@ -348,9 +352,9 @@ bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu)
 
 	if (likely(msg_user(msg) == MSG_FRAGMENTER))
 		return false;
-	if (!bskb)
+	if (!skb)
 		return false;
-	bmsg = buf_msg(bskb);
+	bmsg = buf_msg(skb);
 	bsz = msg_size(bmsg);
 	start = align(bsz);
 	pad = start - bsz;
@@ -359,18 +363,20 @@ bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu)
 		return false;
 	if (unlikely(msg_user(msg) == BCAST_PROTOCOL))
 		return false;
-	if (likely(msg_user(bmsg) != MSG_BUNDLER))
+	if (unlikely(msg_user(bmsg) != MSG_BUNDLER))
 		return false;
-	if (unlikely(skb_tailroom(bskb) < (pad + msz)))
+	if (unlikely(skb_tailroom(skb) < (pad + msz)))
 		return false;
 	if (unlikely(max < (start + msz)))
 		return false;
+	if ((msg_importance(msg) < TIPC_SYSTEM_IMPORTANCE) &&
+	    (msg_importance(bmsg) == TIPC_SYSTEM_IMPORTANCE))
+		return false;
 
-	skb_put(bskb, pad + msz);
-	skb_copy_to_linear_data_offset(bskb, start, skb->data, msz);
+	skb_put(skb, pad + msz);
+	skb_copy_to_linear_data_offset(skb, start, msg, msz);
 	msg_set_size(bmsg, start + msz);
 	msg_set_msgcnt(bmsg, msg_msgcnt(bmsg) + 1);
-	kfree_skb(skb);
 	return true;
 }
 
@@ -416,18 +422,18 @@ none:
 
 /**
  * tipc_msg_make_bundle(): Create bundle buf and append message to its tail
- * @list: the buffer chain
- * @skb: buffer to be appended and replaced
+ * @list: the buffer chain, where head is the buffer to replace/append
+ * @skb: buffer to be created, appended to and returned in case of success
+ * @msg: message to be appended
  * @mtu: max allowable size for the bundle buffer, inclusive header
  * @dnode: destination node for message. (Not always present in header)
- * Replaces buffer if successful
  * Returns true if success, otherwise false
  */
-bool tipc_msg_make_bundle(struct sk_buff **skb, u32 mtu, u32 dnode)
+bool tipc_msg_make_bundle(struct sk_buff **skb,  struct tipc_msg *msg,
+			  u32 mtu, u32 dnode)
 {
-	struct sk_buff *bskb;
+	struct sk_buff *_skb;
 	struct tipc_msg *bmsg;
-	struct tipc_msg *msg = buf_msg(*skb);
 	u32 msz = msg_size(msg);
 	u32 max = mtu - INT_H_SIZE;
 
@@ -440,78 +446,94 @@ bool tipc_msg_make_bundle(struct sk_buff **skb, u32 mtu, u32 dnode)
 	if (msz > (max / 2))
 		return false;
 
-	bskb = tipc_buf_acquire(max);
-	if (!bskb)
+	_skb = tipc_buf_acquire(max);
+	if (!_skb)
 		return false;
 
-	skb_trim(bskb, INT_H_SIZE);
-	bmsg = buf_msg(bskb);
+	skb_trim(_skb, INT_H_SIZE);
+	bmsg = buf_msg(_skb);
 	tipc_msg_init(msg_prevnode(msg), bmsg, MSG_BUNDLER, 0,
 		      INT_H_SIZE, dnode);
+	if (msg_isdata(msg))
+		msg_set_importance(bmsg, TIPC_CRITICAL_IMPORTANCE);
+	else
+		msg_set_importance(bmsg, TIPC_SYSTEM_IMPORTANCE);
 	msg_set_seqno(bmsg, msg_seqno(msg));
 	msg_set_ack(bmsg, msg_ack(msg));
 	msg_set_bcast_ack(bmsg, msg_bcast_ack(msg));
-	tipc_msg_bundle(bskb, *skb, mtu);
-	*skb = bskb;
+	tipc_msg_bundle(_skb, msg, mtu);
+	*skb = _skb;
 	return true;
 }
 
 /**
  * tipc_msg_reverse(): swap source and destination addresses and add error code
- * @buf:  buffer containing message to be reversed
- * @dnode: return value: node where to send message after reversal
- * @err:  error code to be set in message
- * Consumes buffer if failure
+ * @own_node: originating node id for reversed message
+ * @skb:  buffer containing message to be reversed; may be replaced.
+ * @err:  error code to be set in message, if any
+ * Consumes buffer at failure
  * Returns true if success, otherwise false
  */
-bool tipc_msg_reverse(u32 own_addr,  struct sk_buff *buf, u32 *dnode,
-		      int err)
+bool tipc_msg_reverse(u32 own_node,  struct sk_buff **skb, int err)
 {
-	struct tipc_msg *msg = buf_msg(buf);
+	struct sk_buff *_skb = *skb;
+	struct tipc_msg *hdr = buf_msg(_skb);
 	struct tipc_msg ohdr;
-	uint rdsz = min_t(uint, msg_data_sz(msg), MAX_FORWARD_SIZE);
+	int dlen = min_t(uint, msg_data_sz(hdr), MAX_FORWARD_SIZE);
 
-	if (skb_linearize(buf))
+	if (skb_linearize(_skb))
 		goto exit;
-	msg = buf_msg(buf);
-	if (msg_dest_droppable(msg))
+	hdr = buf_msg(_skb);
+	if (msg_dest_droppable(hdr))
 		goto exit;
-	if (msg_errcode(msg))
+	if (msg_errcode(hdr))
 		goto exit;
-	memcpy(&ohdr, msg, msg_hdr_sz(msg));
-	msg_set_errcode(msg, err);
-	msg_set_origport(msg, msg_destport(&ohdr));
-	msg_set_destport(msg, msg_origport(&ohdr));
-	msg_set_prevnode(msg, own_addr);
-	if (!msg_short(msg)) {
-		msg_set_orignode(msg, msg_destnode(&ohdr));
-		msg_set_destnode(msg, msg_orignode(&ohdr));
+
+	/* Take a copy of original header before altering message */
+	memcpy(&ohdr, hdr, msg_hdr_sz(hdr));
+
+	/* Never return SHORT header; expand by replacing buffer if necessary */
+	if (msg_short(hdr)) {
+		*skb = tipc_buf_acquire(BASIC_H_SIZE + dlen);
+		if (!*skb)
+			goto exit;
+		memcpy((*skb)->data + BASIC_H_SIZE, msg_data(hdr), dlen);
+		kfree_skb(_skb);
+		_skb = *skb;
+		hdr = buf_msg(_skb);
+		memcpy(hdr, &ohdr, BASIC_H_SIZE);
+		msg_set_hdr_sz(hdr, BASIC_H_SIZE);
 	}
-	msg_set_size(msg, msg_hdr_sz(msg) + rdsz);
-	skb_trim(buf, msg_size(msg));
-	skb_orphan(buf);
-	*dnode = msg_orignode(&ohdr);
+
+	/* Now reverse the concerned fields */
+	msg_set_errcode(hdr, err);
+	msg_set_origport(hdr, msg_destport(&ohdr));
+	msg_set_destport(hdr, msg_origport(&ohdr));
+	msg_set_destnode(hdr, msg_prevnode(&ohdr));
+	msg_set_prevnode(hdr, own_node);
+	msg_set_orignode(hdr, own_node);
+	msg_set_size(hdr, msg_hdr_sz(hdr) + dlen);
+	skb_trim(_skb, msg_size(hdr));
+	skb_orphan(_skb);
 	return true;
 exit:
-	kfree_skb(buf);
-	*dnode = 0;
+	kfree_skb(_skb);
+	*skb = NULL;
 	return false;
 }
 
 /**
  * tipc_msg_lookup_dest(): try to find new destination for named message
  * @skb: the buffer containing the message.
- * @dnode: return value: next-hop node, if destination found
- * @err: return value: error code to use, if message to be rejected
+ * @err: error code to be used by caller if lookup fails
  * Does not consume buffer
  * Returns true if a destination is found, false otherwise
  */
-bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb,
-			  u32 *dnode, int *err)
+bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err)
 {
 	struct tipc_msg *msg = buf_msg(skb);
-	u32 dport;
-	u32 own_addr = tipc_own_addr(net);
+	u32 dport, dnode;
+	u32 onode = tipc_own_addr(net);
 
 	if (!msg_isdata(msg))
 		return false;
@@ -522,17 +544,18 @@ bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb,
 	*err = -TIPC_ERR_NO_NAME;
 	if (skb_linearize(skb))
 		return false;
+	msg = buf_msg(skb);
 	if (msg_reroute_cnt(msg))
 		return false;
-	*dnode = addr_domain(net, msg_lookup_scope(msg));
+	dnode = addr_domain(net, msg_lookup_scope(msg));
 	dport = tipc_nametbl_translate(net, msg_nametype(msg),
-				       msg_nameinst(msg), dnode);
+				       msg_nameinst(msg), &dnode);
 	if (!dport)
 		return false;
 	msg_incr_reroute_cnt(msg);
-	if (*dnode != own_addr)
-		msg_set_prevnode(msg, own_addr);
-	msg_set_destnode(msg, *dnode);
+	if (dnode != onode)
+		msg_set_prevnode(msg, onode);
+	msg_set_destnode(msg, dnode);
 	msg_set_destport(msg, dport);
 	*err = TIPC_OK;
 	return true;
@@ -541,18 +564,22 @@ bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb,
 /* tipc_msg_reassemble() - clone a buffer chain of fragments and
  *                         reassemble the clones into one message
  */
-struct sk_buff *tipc_msg_reassemble(struct sk_buff_head *list)
+bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq)
 {
-	struct sk_buff *skb;
+	struct sk_buff *skb, *_skb;
 	struct sk_buff *frag = NULL;
 	struct sk_buff *head = NULL;
-	int hdr_sz;
+	int hdr_len;
 
 	/* Copy header if single buffer */
 	if (skb_queue_len(list) == 1) {
 		skb = skb_peek(list);
-		hdr_sz = skb_headroom(skb) + msg_hdr_sz(buf_msg(skb));
-		return __pskb_copy(skb, hdr_sz, GFP_ATOMIC);
+		hdr_len = skb_headroom(skb) + msg_hdr_sz(buf_msg(skb));
+		_skb = __pskb_copy(skb, hdr_len, GFP_ATOMIC);
+		if (!_skb)
+			return false;
+		__skb_queue_tail(rcvq, _skb);
+		return true;
 	}
 
 	/* Clone all fragments and reassemble */
@@ -566,9 +593,41 @@ struct sk_buff *tipc_msg_reassemble(struct sk_buff_head *list)
 		if (!head)
 			goto error;
 	}
-	return frag;
+	__skb_queue_tail(rcvq, frag);
+	return true;
 error:
 	pr_warn("Failed do clone local mcast rcv buffer\n");
 	kfree_skb(head);
-	return NULL;
+	return false;
+}
+
+/* tipc_skb_queue_sorted(); sort pkt into list according to sequence number
+ * @list: list to be appended to
+ * @seqno: sequence number of buffer to add
+ * @skb: buffer to add
+ */
+void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
+			     struct sk_buff *skb)
+{
+	struct sk_buff *_skb, *tmp;
+
+	if (skb_queue_empty(list) || less(seqno, buf_seqno(skb_peek(list)))) {
+		__skb_queue_head(list, skb);
+		return;
+	}
+
+	if (more(seqno, buf_seqno(skb_peek_tail(list)))) {
+		__skb_queue_tail(list, skb);
+		return;
+	}
+
+	skb_queue_walk_safe(list, _skb, tmp) {
+		if (more(seqno, buf_seqno(_skb)))
+			continue;
+		if (seqno == buf_seqno(_skb))
+			break;
+		__skb_queue_before(list, _skb, skb);
+		return;
+	}
+	kfree_skb(skb);
 }