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[PATCH net-next 00/13] rxrpc: Fixes

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  [PATCH net-next 00/13] rxrpc: Fixes David Howells <dhowells@redhat.com> - 2016-10-06 12:10 +0200
    [PATCH net 10/13] rxrpc: Return negative error code to kernel  service David Howells <dhowells@redhat.com> - 2016-10-06 12:10 +0200
    [PATCH net 03/13] rxrpc: Fix oops on incoming call to serviceless  endpoint David Howells <dhowells@redhat.com> - 2016-10-06 12:10 +0200
    [PATCH net 05/13] rxrpc: Fix warning by splitting  rxrpc_send_call_packet() David Howells <dhowells@redhat.com> - 2016-10-06 12:10 +0200
    [PATCH net 13/13] rxrpc: Don't request an ACK on the last DATA  packet of a call's Tx phase David Howells <dhowells@redhat.com> - 2016-10-06 12:10 +0200
    [PATCH net 07/13] rxrpc: Partially handle OpenAFS's improper  termination of calls David Howells <dhowells@redhat.com> - 2016-10-06 12:10 +0200
    Re: [PATCH net-next 00/13] rxrpc: Fixes David Miller <davem@davemloft.net> - 2016-10-07 03:10 +0200

#1496566 — [PATCH net-next 00/13] rxrpc: Fixes

This set of patches contains a bunch of fixes:

 (1) Fix an oops on incoming call to a local endpoint without a bound
     service.

 (2) Only ping for a lost reply in a client call (this is inapplicable to
     service calls).

 (3) Fix maybe uninitialised variable warnings in the ACK/ABORT sending
     function by splitting it.

 (4) Fix loss of PING RESPONSE ACKs due to them being subsumed by PING ACK
     generation.

 (5) OpenAFS improperly terminates calls it makes as a client under some
     circumstances by not fully hard-ACK'ing the last DATA packets.  This
     is alleviated by a new call appearing on the same channel implicitly
     completing the previous call on that channel.  Handle this implicit
     completion.

 (6) Properly handle expiry of service calls due to the aforementioned
     improper termination with no follow up call to implicitly complete it:

     (a) The call's background processor needs to be queued to complete the
     	 call, send an abort and notify the socket.

     (b) The call's background processor needs to notify the socket (or the
     	 kernel service) when it has completed the call.

     (c) A negative error code must thence be returned to the kernel
     	 service so that it knows the call died.

     (d) The AFS filesystem must detect the fatal error and end the call.

 (7) Must produce a DELAY ACK when the actual service operation takes a
     while to process and must cancel the ACK when the reply is ready.

 (8) Don't request an ACK on the last DATA packet of the Tx phase as this
     confuses OpenAFS.

The patches can be found here also:

	http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=rxrpc-rewrite

Tagged thusly:

	git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
	rxrpc-rewrite-20161004

David
---
David Howells (13):
      rxrpc: Accesses of rxrpc_local::service need to be RCU managed
      rxrpc: Fix duplicate const
      rxrpc: Fix oops on incoming call to serviceless endpoint
      rxrpc: Only ping for lost reply in client call
      rxrpc: Fix warning by splitting rxrpc_send_call_packet()
      rxrpc: Fix loss of PING RESPONSE ACK production due to PING ACKs
      rxrpc: Partially handle OpenAFS's improper termination of calls
      rxrpc: Queue the call on expiry
      rxrpc: Add missing notification
      rxrpc: Return negative error code to kernel service
      afs: Check for fatal error when in waiting for ack state
      rxrpc: Need to produce an ACK for service op if op takes a long time
      rxrpc: Don't request an ACK on the last DATA packet of a call's Tx phase


 fs/afs/rxrpc.c          |    2 -
 net/rxrpc/af_rxrpc.c    |    4 +
 net/rxrpc/ar-internal.h |   18 ++++-
 net/rxrpc/call_accept.c |    4 +
 net/rxrpc/call_event.c  |   77 +++++++++++++++++---
 net/rxrpc/call_object.c |    3 +
 net/rxrpc/input.c       |   44 +++++++++++-
 net/rxrpc/misc.c        |    6 +-
 net/rxrpc/output.c      |  179 +++++++++++++++++++++++++++--------------------
 net/rxrpc/recvmsg.c     |   14 ++--
 net/rxrpc/rxkad.c       |    6 +-
 net/rxrpc/sendmsg.c     |   12 ++-
 12 files changed, 252 insertions(+), 117 deletions(-)

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#1496567 — [PATCH net 10/13] rxrpc: Return negative error code to kernel service

In rxrpc_kernel_recv_data(), when we return the error number incurred by a
failed call, we must negate it before returning it as it's stored as
positive (that's what we have to pass back to userspace).

Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/recvmsg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 3fa7771c2a9d..db5b02a47518 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -652,7 +652,7 @@ excess_data:
 	goto out;
 call_complete:
 	*_abort = call->abort_code;
-	ret = call->error;
+	ret = -call->error;
 	if (call->completion == RXRPC_CALL_SUCCEEDED) {
 		ret = 1;
 		if (size > 0)

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#1496568 — [PATCH net 03/13] rxrpc: Fix oops on incoming call to serviceless endpoint

If an call comes in to a local endpoint that isn't listening for any
incoming calls at the moment, an oops will happen.  We need to check that
the local endpoint's service pointer isn't NULL before we dereference it.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/call_accept.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index 3cac231d8405..22cd8a18c481 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -337,7 +337,7 @@ struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
 
 	/* Get the socket providing the service */
 	rx = rcu_dereference(local->service);
-	if (service_id == rx->srx.srx_service)
+	if (rx && service_id == rx->srx.srx_service)
 		goto found_service;
 
 	trace_rxrpc_abort("INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,

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#1496569 — [PATCH net 05/13] rxrpc: Fix warning by splitting rxrpc_send_call_packet()

Split rxrpc_send_data_packet() to separate ACK generation (which is more
complicated) from ABORT generation.  This simplifies the code a bit and
fixes the following warning:

In file included from ../net/rxrpc/output.c:20:0:
net/rxrpc/output.c: In function 'rxrpc_send_call_packet':
net/rxrpc/ar-internal.h:1187:27: error: 'top' may be used uninitialized in this function [-Werror=maybe-uninitialized]
net/rxrpc/output.c:103:24: note: 'top' was declared here
net/rxrpc/output.c:225:25: error: 'hard_ack' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/ar-internal.h |    3 +
 net/rxrpc/call_accept.c |    2 -
 net/rxrpc/call_event.c  |    6 +-
 net/rxrpc/call_object.c |    2 -
 net/rxrpc/output.c      |  156 ++++++++++++++++++++++++++---------------------
 net/rxrpc/recvmsg.c     |    4 +
 net/rxrpc/rxkad.c       |    6 +-
 net/rxrpc/sendmsg.c     |    7 +-
 8 files changed, 102 insertions(+), 84 deletions(-)

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 4954e6e25819..ef849a12a0f0 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -1068,7 +1068,8 @@ extern const s8 rxrpc_ack_priority[];
 /*
  * output.c
  */
-int rxrpc_send_call_packet(struct rxrpc_call *, u8);
+int rxrpc_send_ack_packet(struct rxrpc_call *);
+int rxrpc_send_abort_packet(struct rxrpc_call *);
 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
 void rxrpc_reject_packets(struct rxrpc_local *);
 
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index 22cd8a18c481..832d854c2d5c 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -565,7 +565,7 @@ out_discard:
 	write_unlock_bh(&call->state_lock);
 	write_unlock(&rx->call_lock);
 	if (abort) {
-		rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
+		rxrpc_send_abort_packet(call);
 		rxrpc_release_call(rx, call);
 		rxrpc_put_call(call, rxrpc_call_put);
 	}
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index 4f00476630b9..e313099860d5 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -253,7 +253,7 @@ static void rxrpc_resend(struct rxrpc_call *call, ktime_t now)
 			goto out;
 		rxrpc_propose_ACK(call, RXRPC_ACK_PING, 0, 0, true, false,
 				  rxrpc_propose_ack_ping_for_lost_ack);
-		rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK);
+		rxrpc_send_ack_packet(call);
 		goto out;
 	}
 
@@ -328,7 +328,7 @@ void rxrpc_process_call(struct work_struct *work)
 
 recheck_state:
 	if (test_and_clear_bit(RXRPC_CALL_EV_ABORT, &call->events)) {
-		rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
+		rxrpc_send_abort_packet(call);
 		goto recheck_state;
 	}
 
@@ -347,7 +347,7 @@ recheck_state:
 	if (test_and_clear_bit(RXRPC_CALL_EV_ACK, &call->events)) {
 		call->ack_at = call->expire_at;
 		if (call->ackr_reason) {
-			rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK);
+			rxrpc_send_ack_packet(call);
 			goto recheck_state;
 		}
 	}
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 364b42dc3dce..07094012ac15 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -498,7 +498,7 @@ void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
 				  struct rxrpc_call, sock_link);
 		rxrpc_get_call(call, rxrpc_call_got);
 		rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET);
-		rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
+		rxrpc_send_abort_packet(call);
 		rxrpc_release_call(rx, call);
 		rxrpc_put_call(call, rxrpc_call_put);
 	}
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 0d47db886f6e..2dae877c0876 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -19,24 +19,24 @@
 #include <net/af_rxrpc.h>
 #include "ar-internal.h"
 
-struct rxrpc_pkt_buffer {
+struct rxrpc_ack_buffer {
 	struct rxrpc_wire_header whdr;
-	union {
-		struct {
-			struct rxrpc_ackpacket ack;
-			u8 acks[255];
-			u8 pad[3];
-		};
-		__be32 abort_code;
-	};
+	struct rxrpc_ackpacket ack;
+	u8 acks[255];
+	u8 pad[3];
 	struct rxrpc_ackinfo ackinfo;
 };
 
+struct rxrpc_abort_buffer {
+	struct rxrpc_wire_header whdr;
+	__be32 abort_code;
+};
+
 /*
  * Fill out an ACK packet.
  */
 static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
-				 struct rxrpc_pkt_buffer *pkt,
+				 struct rxrpc_ack_buffer *pkt,
 				 rxrpc_seq_t *_hard_ack,
 				 rxrpc_seq_t *_top)
 {
@@ -91,22 +91,19 @@ static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
 }
 
 /*
- * Send an ACK or ABORT call packet.
+ * Send an ACK call packet.
  */
-int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type)
+int rxrpc_send_ack_packet(struct rxrpc_call *call)
 {
 	struct rxrpc_connection *conn = NULL;
-	struct rxrpc_pkt_buffer *pkt;
+	struct rxrpc_ack_buffer *pkt;
 	struct msghdr msg;
 	struct kvec iov[2];
 	rxrpc_serial_t serial;
 	rxrpc_seq_t hard_ack, top;
 	size_t len, n;
 	bool ping = false;
-	int ioc, ret;
-	u32 abort_code;
-
-	_enter("%u,%s", call->debug_id, rxrpc_pkts[type]);
+	int ret;
 
 	spin_lock_bh(&call->lock);
 	if (call->conn)
@@ -131,65 +128,37 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type)
 	pkt->whdr.cid		= htonl(call->cid);
 	pkt->whdr.callNumber	= htonl(call->call_id);
 	pkt->whdr.seq		= 0;
-	pkt->whdr.type		= type;
-	pkt->whdr.flags		= conn->out_clientflag;
+	pkt->whdr.type		= RXRPC_PACKET_TYPE_ACK;
+	pkt->whdr.flags		= RXRPC_SLOW_START_OK | conn->out_clientflag;
 	pkt->whdr.userStatus	= 0;
 	pkt->whdr.securityIndex	= call->security_ix;
 	pkt->whdr._rsvd		= 0;
 	pkt->whdr.serviceId	= htons(call->service_id);
 
-	iov[0].iov_base	= pkt;
-	iov[0].iov_len	= sizeof(pkt->whdr);
-	len = sizeof(pkt->whdr);
-
-	switch (type) {
-	case RXRPC_PACKET_TYPE_ACK:
-		spin_lock_bh(&call->lock);
-		if (!call->ackr_reason) {
-			spin_unlock_bh(&call->lock);
-			ret = 0;
-			goto out;
-		}
-		ping = (call->ackr_reason == RXRPC_ACK_PING);
-		n = rxrpc_fill_out_ack(call, pkt, &hard_ack, &top);
-		call->ackr_reason = 0;
-
+	spin_lock_bh(&call->lock);
+	if (!call->ackr_reason) {
 		spin_unlock_bh(&call->lock);
-
-
-		pkt->whdr.flags |= RXRPC_SLOW_START_OK;
-
-		iov[0].iov_len += sizeof(pkt->ack) + n;
-		iov[1].iov_base = &pkt->ackinfo;
-		iov[1].iov_len	= sizeof(pkt->ackinfo);
-		len += sizeof(pkt->ack) + n + sizeof(pkt->ackinfo);
-		ioc = 2;
-		break;
-
-	case RXRPC_PACKET_TYPE_ABORT:
-		abort_code = call->abort_code;
-		pkt->abort_code = htonl(abort_code);
-		iov[0].iov_len += sizeof(pkt->abort_code);
-		len += sizeof(pkt->abort_code);
-		ioc = 1;
-		break;
-
-	default:
-		BUG();
-		ret = -ENOANO;
+		ret = 0;
 		goto out;
 	}
+	ping = (call->ackr_reason == RXRPC_ACK_PING);
+	n = rxrpc_fill_out_ack(call, pkt, &hard_ack, &top);
+	call->ackr_reason = 0;
+
+	spin_unlock_bh(&call->lock);
+
+	iov[0].iov_base	= pkt;
+	iov[0].iov_len	= sizeof(pkt->whdr) + sizeof(pkt->ack) + n;
+	iov[1].iov_base = &pkt->ackinfo;
+	iov[1].iov_len	= sizeof(pkt->ackinfo);
+	len = iov[0].iov_len + iov[1].iov_len;
 
 	serial = atomic_inc_return(&conn->serial);
 	pkt->whdr.serial = htonl(serial);
-	switch (type) {
-	case RXRPC_PACKET_TYPE_ACK:
-		trace_rxrpc_tx_ack(call, serial,
-				   ntohl(pkt->ack.firstPacket),
-				   ntohl(pkt->ack.serial),
-				   pkt->ack.reason, pkt->ack.nAcks);
-		break;
-	}
+	trace_rxrpc_tx_ack(call, serial,
+			   ntohl(pkt->ack.firstPacket),
+			   ntohl(pkt->ack.serial),
+			   pkt->ack.reason, pkt->ack.nAcks);
 
 	if (ping) {
 		call->ackr_ping = serial;
@@ -205,13 +174,12 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type)
 		set_bit(RXRPC_CALL_PINGING, &call->flags);
 		trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_ping, serial);
 	}
-	ret = kernel_sendmsg(conn->params.local->socket,
-			     &msg, iov, ioc, len);
+
+	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
 	if (ping)
 		call->ackr_ping_time = ktime_get_real();
 
-	if (type == RXRPC_PACKET_TYPE_ACK &&
-	    call->state < RXRPC_CALL_COMPLETE) {
+	if (call->state < RXRPC_CALL_COMPLETE) {
 		if (ret < 0) {
 			clear_bit(RXRPC_CALL_PINGING, &call->flags);
 			rxrpc_propose_ACK(call, pkt->ack.reason,
@@ -236,6 +204,56 @@ out:
 }
 
 /*
+ * Send an ABORT call packet.
+ */
+int rxrpc_send_abort_packet(struct rxrpc_call *call)
+{
+	struct rxrpc_connection *conn = NULL;
+	struct rxrpc_abort_buffer pkt;
+	struct msghdr msg;
+	struct kvec iov[1];
+	rxrpc_serial_t serial;
+	int ret;
+
+	spin_lock_bh(&call->lock);
+	if (call->conn)
+		conn = rxrpc_get_connection_maybe(call->conn);
+	spin_unlock_bh(&call->lock);
+	if (!conn)
+		return -ECONNRESET;
+
+	msg.msg_name	= &call->peer->srx.transport;
+	msg.msg_namelen	= call->peer->srx.transport_len;
+	msg.msg_control	= NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags	= 0;
+
+	pkt.whdr.epoch		= htonl(conn->proto.epoch);
+	pkt.whdr.cid		= htonl(call->cid);
+	pkt.whdr.callNumber	= htonl(call->call_id);
+	pkt.whdr.seq		= 0;
+	pkt.whdr.type		= RXRPC_PACKET_TYPE_ABORT;
+	pkt.whdr.flags		= conn->out_clientflag;
+	pkt.whdr.userStatus	= 0;
+	pkt.whdr.securityIndex	= call->security_ix;
+	pkt.whdr._rsvd		= 0;
+	pkt.whdr.serviceId	= htons(call->service_id);
+	pkt.abort_code		= htonl(call->abort_code);
+
+	iov[0].iov_base	= &pkt;
+	iov[0].iov_len	= sizeof(pkt);
+
+	serial = atomic_inc_return(&conn->serial);
+	pkt.whdr.serial = htonl(serial);
+
+	ret = kernel_sendmsg(conn->params.local->socket,
+			     &msg, iov, 1, sizeof(pkt));
+
+	rxrpc_put_connection(conn);
+	return ret;
+}
+
+/*
  * send a packet through the transport endpoint
  */
 int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index f05ea0a88076..11723bc1c783 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -143,7 +143,7 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call, rxrpc_serial_t serial)
 	if (call->state == RXRPC_CALL_CLIENT_RECV_REPLY) {
 		rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, 0, serial, true, false,
 				  rxrpc_propose_ack_terminal_ack);
-		rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK);
+		rxrpc_send_ack_packet(call);
 	}
 
 	write_lock_bh(&call->state_lock);
@@ -212,7 +212,7 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
 					  true, false,
 					  rxrpc_propose_ack_rotate_rx);
 		if (call->ackr_reason)
-			rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK);
+			rxrpc_send_ack_packet(call);
 	}
 }
 
diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
index 627abed5f999..4374e7b9c7bf 100644
--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -381,7 +381,7 @@ static int rxkad_verify_packet_1(struct rxrpc_call *call, struct sk_buff *skb,
 	return 0;
 
 protocol_error:
-	rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
+	rxrpc_send_abort_packet(call);
 	_leave(" = -EPROTO");
 	return -EPROTO;
 
@@ -471,7 +471,7 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb,
 	return 0;
 
 protocol_error:
-	rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
+	rxrpc_send_abort_packet(call);
 	_leave(" = -EPROTO");
 	return -EPROTO;
 
@@ -523,7 +523,7 @@ static int rxkad_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
 
 	if (cksum != expected_cksum) {
 		rxrpc_abort_call("VCK", call, seq, RXKADSEALEDINCON, EPROTO);
-		rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
+		rxrpc_send_abort_packet(call);
 		_leave(" = -EPROTO [csum failed]");
 		return -EPROTO;
 	}
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 3322543d460a..901b28ceeff4 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -197,7 +197,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
 	do {
 		/* Check to see if there's a ping ACK to reply to. */
 		if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
-			rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK);
+			rxrpc_send_ack_packet(call);
 
 		if (!skb) {
 			size_t size, chunk, max, space;
@@ -514,8 +514,7 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
 	} else if (cmd == RXRPC_CMD_SEND_ABORT) {
 		ret = 0;
 		if (rxrpc_abort_call("CMD", call, 0, abort_code, ECONNABORTED))
-			ret = rxrpc_send_call_packet(call,
-						     RXRPC_PACKET_TYPE_ABORT);
+			ret = rxrpc_send_abort_packet(call);
 	} else if (cmd != RXRPC_CMD_SEND_DATA) {
 		ret = -EINVAL;
 	} else if (rxrpc_is_client_call(call) &&
@@ -597,7 +596,7 @@ void rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
 	lock_sock(sock->sk);
 
 	if (rxrpc_abort_call(why, call, 0, abort_code, error))
-		rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
+		rxrpc_send_abort_packet(call);
 
 	release_sock(sock->sk);
 	_leave("");

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#1496570 — [PATCH net 13/13] rxrpc: Don't request an ACK on the last DATA packet of a call's Tx phase

Don't request an ACK on the last DATA packet of a call's Tx phase as for a
client there will be a reply packet or some sort of ACK to shift phase.  If
the ACK is requested, OpenAFS sends a REQUESTED-ACK ACK with soft-ACKs in
it and doesn't follow up with a hard-ACK.

If we don't set the flag, OpenAFS will send a DELAY ACK that hard-ACKs the
reply data, thereby allowing the call to terminate cleanly.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/output.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index a12cea0cbc05..5dab1ff3a6c2 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -307,11 +307,12 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
 	/* If our RTT cache needs working on, request an ACK.  Also request
 	 * ACKs if a DATA packet appears to have been lost.
 	 */
-	if (retrans ||
-	    call->cong_mode == RXRPC_CALL_SLOW_START ||
-	    (call->peer->rtt_usage < 3 && sp->hdr.seq & 1) ||
-	    ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000),
-			 ktime_get_real()))
+	if (!(sp->hdr.flags & RXRPC_LAST_PACKET) &&
+	    (retrans ||
+	     call->cong_mode == RXRPC_CALL_SLOW_START ||
+	     (call->peer->rtt_usage < 3 && sp->hdr.seq & 1) ||
+	     ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000),
+			  ktime_get_real())))
 		whdr.flags |= RXRPC_REQUEST_ACK;
 
 	if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {

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#1496571 — [PATCH net 07/13] rxrpc: Partially handle OpenAFS's improper termination of calls

OpenAFS doesn't always correctly terminate client calls that it makes -
this includes calls the OpenAFS servers make to the cache manager service.
It should end the client call with either:

 (1) An ACK that has firstPacket set to one greater than the seq number of
     the reply DATA packet with the LAST_PACKET flag set (thereby
     hard-ACK'ing all packets).  nAcks should be 0 and acks[] should be
     empty (ie. no soft-ACKs).

 (2) An ACKALL packet.

OpenAFS, though, may send an ACK packet with firstPacket set to the last
seq number or less and soft-ACKs listed for all packets up to and including
the last DATA packet.

The transmitter, however, is obliged to keep the call live and the
soft-ACK'd DATA packets around until they're hard-ACK'd as the receiver is
permitted to drop any merely soft-ACK'd packet and request retransmission
by sending an ACK packet with a NACK in it.

Further, OpenAFS will also terminate a client call by beginning the next
client call on the same connection channel.  This implicitly completes the
previous call.

This patch handles implicit ACK of a call on a channel by the reception of
the first packet of the next call on that channel.

If another call doesn't come along to implicitly ACK a call, then we have
to time the call out.  There are some bugs there that will be addressed in
subsequent patches.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/input.c |   37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index a6da83f036d6..44fb8d893c7d 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -939,6 +939,33 @@ static void rxrpc_input_call_packet(struct rxrpc_call *call,
 }
 
 /*
+ * Handle a new call on a channel implicitly completing the preceding call on
+ * that channel.
+ *
+ * TODO: If callNumber > call_id + 1, renegotiate security.
+ */
+static void rxrpc_input_implicit_end_call(struct rxrpc_connection *conn,
+					  struct rxrpc_call *call)
+{
+	switch (call->state) {
+	case RXRPC_CALL_SERVER_AWAIT_ACK:
+		rxrpc_call_completed(call);
+		break;
+	case RXRPC_CALL_COMPLETE:
+		break;
+	default:
+		if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, ESHUTDOWN)) {
+			set_bit(RXRPC_CALL_EV_ABORT, &call->events);
+			rxrpc_queue_call(call);
+		}
+		break;
+	}
+
+	__rxrpc_disconnect_call(conn, call);
+	rxrpc_notify_socket(call);
+}
+
+/*
  * post connection-level events to the connection
  * - this includes challenges, responses, some aborts and call terminal packet
  *   retransmission.
@@ -1146,6 +1173,16 @@ void rxrpc_data_ready(struct sock *udp_sk)
 		}
 
 		call = rcu_dereference(chan->call);
+
+		if (sp->hdr.callNumber > chan->call_id) {
+			if (!(sp->hdr.flags & RXRPC_CLIENT_INITIATED)) {
+				rcu_read_unlock();
+				goto reject_packet;
+			}
+			if (call)
+				rxrpc_input_implicit_end_call(conn, call);
+			call = NULL;
+		}
 	} else {
 		skew = 0;
 		call = NULL;

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#1496956

From: David Howells <dhowells@redhat.com>
Date: Thu, 06 Oct 2016 11:03:56 +0100

> This set of patches contains a bunch of fixes:
 ...

Pulled, thanks David.

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