Merge branch 'sctp-stream-interleave-part-1'

Xin Long says:

====================
sctp: Implement Stream Interleave: The I-DATA Chunk Supporting User Message Interleaving

Stream Interleave would be Implemented in two Parts:

   1. The I-DATA Chunk Supporting User Message Interleaving
   2. Interaction with Other SCTP Extensions

Overview in section 1.1 of RFC8260 for Part 1:

   This document describes a new chunk carrying payload data called
   I-DATA.  This chunk incorporates the properties of the current SCTP
   DATA chunk, all the flags and fields except the Stream Sequence
   Number (SSN), and also adds two new fields in its chunk header -- the
   Fragment Sequence Number (FSN) and the Message Identifier (MID).  The
   FSN is only used for reassembling all fragments that have the same
   MID and the same ordering property.  The TSN is only used for the
   reliable transfer in combination with Selective Acknowledgment (SACK)
   chunks.

   In addition, the MID is also used for ensuring ordered delivery
   instead of using the stream sequence number (the I-DATA chunk omits
   an SSN).

As the 1st part of Stream Interleave Implementation, this patchset adds
an ops framework named sctp_stream_interleave with a bunch of stuff that
does lots of things needed somewhere.

Then it defines sctp_stream_interleave_0 to work for normal DATA chunks
and sctp_stream_interleave_1 for I-DATA chunks.

With these functions, hundreds of if-else checks for the different process
on I-DATA chunks would be avoided. Besides, very few codes could be shared
in these two function sets.

In this patchset, it adds some basic variables, structures and socket
options firstly, then implement these functions one by one to add the
procedures for ordered idata gradually, at last adjusts some codes to
make them work for unordered idata.

To make it safe to be implemented and also not break the normal data
chunk process, this feature can't be enabled to use until all stream
interleave codes are completely accomplished.

v1 -> v2:
  - fixed a checkpatch warning that a blank line was missed.
  - avoided a kbuild warning reported from gcc-4.9.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 10 deletions

diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index df94d77401e7..8adde71fdb31 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -632,7 +632,7 @@ static void sctp_cmd_assoc_failed(struct sctp_cmd_seq *commands,
 	struct sctp_chunk *abort;
 
 	/* Cancel any partial delivery in progress. */
-	sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
+	asoc->stream.si->abort_pd(&asoc->ulpq, GFP_ATOMIC);
 
 	if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
 		event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
@@ -972,7 +972,7 @@ static void sctp_cmd_process_operr(struct sctp_cmd_seq *cmds,
 		if (!ev)
 			return;
 
-		sctp_ulpq_tail_event(&asoc->ulpq, ev);
+		asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
 
 		switch (err_hdr->cause) {
 		case SCTP_ERROR_UNKNOWN_CHUNK:
@@ -1058,7 +1058,7 @@ static void sctp_cmd_assoc_change(struct sctp_cmd_seq *commands,
 					    asoc->c.sinit_max_instreams,
 					    NULL, GFP_ATOMIC);
 	if (ev)
-		sctp_ulpq_tail_event(&asoc->ulpq, ev);
+		asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
 }
 
 /* Helper function to generate an adaptation indication event */
@@ -1070,7 +1070,7 @@ static void sctp_cmd_adaptation_ind(struct sctp_cmd_seq *commands,
 	ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
 
 	if (ev)
-		sctp_ulpq_tail_event(&asoc->ulpq, ev);
+		asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
 }
 
 
@@ -1483,8 +1483,9 @@ static int sctp_cmd_interpreter(enum sctp_event event_type,
 			pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
 				 __func__, cmd->obj.chunk, &asoc->ulpq);
 
-			sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk,
-					    GFP_ATOMIC);
+			asoc->stream.si->ulpevent_data(&asoc->ulpq,
+						       cmd->obj.chunk,
+						       GFP_ATOMIC);
 			break;
 
 		case SCTP_CMD_EVENT_ULP:
@@ -1492,7 +1493,8 @@ static int sctp_cmd_interpreter(enum sctp_event event_type,
 			pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
 				 __func__, cmd->obj.ulpevent, &asoc->ulpq);
 
-			sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent);
+			asoc->stream.si->enqueue_event(&asoc->ulpq,
+						       cmd->obj.ulpevent);
 			break;
 
 		case SCTP_CMD_REPLY:
@@ -1729,12 +1731,13 @@ static int sctp_cmd_interpreter(enum sctp_event event_type,
 			break;
 
 		case SCTP_CMD_PART_DELIVER:
-			sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC);
+			asoc->stream.si->start_pd(&asoc->ulpq, GFP_ATOMIC);
 			break;
 
 		case SCTP_CMD_RENEGE:
-			sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk,
-					 GFP_ATOMIC);
+			asoc->stream.si->renege_events(&asoc->ulpq,
+						       cmd->obj.chunk,
+						       GFP_ATOMIC);
 			break;
 
 		case SCTP_CMD_SETUP_T4: