* [PATCH net-next 01/12] rxrpc: The mutex lock returned by rxrpc_accept_call() needs releasing
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
@ 2017-11-24 14:37 ` David Howells
2017-11-24 14:37 ` [PATCH net-next 02/12] rxrpc: Don't set upgrade by default in sendmsg() David Howells
` (11 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:37 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
The caller of rxrpc_accept_call() must release the lock on call->user_mutex
returned by that function.
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/sendmsg.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 7d2595582c09..3a99b1a908df 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -619,8 +619,8 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
/* The socket is now unlocked. */
if (IS_ERR(call))
return PTR_ERR(call);
- rxrpc_put_call(call, rxrpc_call_put);
- return 0;
+ ret = 0;
+ goto out_put_unlock;
}
call = rxrpc_find_call_by_user_ID(rx, p.user_call_ID);
@@ -689,6 +689,7 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
ret = rxrpc_send_data(rx, call, msg, len, NULL);
}
+out_put_unlock:
mutex_unlock(&call->user_mutex);
error_put:
rxrpc_put_call(call, rxrpc_call_put);
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 02/12] rxrpc: Don't set upgrade by default in sendmsg()
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
2017-11-24 14:37 ` [PATCH net-next 01/12] rxrpc: The mutex lock returned by rxrpc_accept_call() needs releasing David Howells
@ 2017-11-24 14:37 ` David Howells
2017-11-24 14:38 ` [PATCH net-next 03/12] rxrpc: Provide a different lockdep key for call->user_mutex for kernel calls David Howells
` (10 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:37 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
Don't set upgrade by default when creating a call from sendmsg(). This is
a holdover from when I was testing the code.
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/sendmsg.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 3a99b1a908df..94555c94b2d8 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -602,7 +602,7 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
.abort_code = 0,
.command = RXRPC_CMD_SEND_DATA,
.exclusive = false,
- .upgrade = true,
+ .upgrade = false,
};
_enter("");
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 03/12] rxrpc: Provide a different lockdep key for call->user_mutex for kernel calls
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
2017-11-24 14:37 ` [PATCH net-next 01/12] rxrpc: The mutex lock returned by rxrpc_accept_call() needs releasing David Howells
2017-11-24 14:37 ` [PATCH net-next 02/12] rxrpc: Don't set upgrade by default in sendmsg() David Howells
@ 2017-11-24 14:38 ` David Howells
2017-11-24 14:38 ` [PATCH net-next 04/12] rxrpc: Delay terminal ACK transmission on a client call David Howells
` (9 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:38 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
Provide a different lockdep key for rxrpc_call::user_mutex when the call is
made on a kernel socket, such as by the AFS filesystem.
The problem is that lockdep registers a false positive between userspace
calling the sendmsg syscall on a user socket where call->user_mutex is held
whilst userspace memory is accessed whereas the AFS filesystem may perform
operations with mmap_sem held by the caller.
In such a case, the following warning is produced.
======================================================
WARNING: possible circular locking dependency detected
4.14.0-fscache+ #243 Tainted: G E
------------------------------------------------------
modpost/16701 is trying to acquire lock:
(&vnode->io_lock){+.+.}, at: [<ffffffffa000fc40>] afs_begin_vnode_operation+0x33/0x77 [kafs]
but task is already holding lock:
(&mm->mmap_sem){++++}, at: [<ffffffff8104376a>] __do_page_fault+0x1ef/0x486
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&mm->mmap_sem){++++}:
__might_fault+0x61/0x89
_copy_from_iter_full+0x40/0x1fa
rxrpc_send_data+0x8dc/0xff3
rxrpc_do_sendmsg+0x62f/0x6a1
rxrpc_sendmsg+0x166/0x1b7
sock_sendmsg+0x2d/0x39
___sys_sendmsg+0x1ad/0x22b
__sys_sendmsg+0x41/0x62
do_syscall_64+0x89/0x1be
return_from_SYSCALL_64+0x0/0x75
-> #2 (&call->user_mutex){+.+.}:
__mutex_lock+0x86/0x7d2
rxrpc_new_client_call+0x378/0x80e
rxrpc_kernel_begin_call+0xf3/0x154
afs_make_call+0x195/0x454 [kafs]
afs_vl_get_capabilities+0x193/0x198 [kafs]
afs_vl_lookup_vldb+0x5f/0x151 [kafs]
afs_create_volume+0x2e/0x2f4 [kafs]
afs_mount+0x56a/0x8d7 [kafs]
mount_fs+0x6a/0x109
vfs_kern_mount+0x67/0x135
do_mount+0x90b/0xb57
SyS_mount+0x72/0x98
do_syscall_64+0x89/0x1be
return_from_SYSCALL_64+0x0/0x75
-> #1 (k-sk_lock-AF_RXRPC){+.+.}:
lock_sock_nested+0x74/0x8a
rxrpc_kernel_begin_call+0x8a/0x154
afs_make_call+0x195/0x454 [kafs]
afs_fs_get_capabilities+0x17a/0x17f [kafs]
afs_probe_fileserver+0xf7/0x2f0 [kafs]
afs_select_fileserver+0x83f/0x903 [kafs]
afs_fetch_status+0x89/0x11d [kafs]
afs_iget+0x16f/0x4f8 [kafs]
afs_mount+0x6c6/0x8d7 [kafs]
mount_fs+0x6a/0x109
vfs_kern_mount+0x67/0x135
do_mount+0x90b/0xb57
SyS_mount+0x72/0x98
do_syscall_64+0x89/0x1be
return_from_SYSCALL_64+0x0/0x75
-> #0 (&vnode->io_lock){+.+.}:
lock_acquire+0x174/0x19f
__mutex_lock+0x86/0x7d2
afs_begin_vnode_operation+0x33/0x77 [kafs]
afs_fetch_data+0x80/0x12a [kafs]
afs_readpages+0x314/0x405 [kafs]
__do_page_cache_readahead+0x203/0x2ba
filemap_fault+0x179/0x54d
__do_fault+0x17/0x60
__handle_mm_fault+0x6d7/0x95c
handle_mm_fault+0x24e/0x2a3
__do_page_fault+0x301/0x486
do_page_fault+0x236/0x259
page_fault+0x22/0x30
__clear_user+0x3d/0x60
padzero+0x1c/0x2b
load_elf_binary+0x785/0xdc7
search_binary_handler+0x81/0x1ff
do_execveat_common.isra.14+0x600/0x888
do_execve+0x1f/0x21
SyS_execve+0x28/0x2f
do_syscall_64+0x89/0x1be
return_from_SYSCALL_64+0x0/0x75
other info that might help us debug this:
Chain exists of:
&vnode->io_lock --> &call->user_mutex --> &mm->mmap_sem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&mm->mmap_sem);
lock(&call->user_mutex);
lock(&mm->mmap_sem);
lock(&vnode->io_lock);
*** DEADLOCK ***
1 lock held by modpost/16701:
#0: (&mm->mmap_sem){++++}, at: [<ffffffff8104376a>] __do_page_fault+0x1ef/0x486
stack backtrace:
CPU: 0 PID: 16701 Comm: modpost Tainted: G E 4.14.0-fscache+ #243
Hardware name: ASUS All Series/H97-PLUS, BIOS 2306 10/09/2014
Call Trace:
dump_stack+0x67/0x8e
print_circular_bug+0x341/0x34f
check_prev_add+0x11f/0x5d4
? add_lock_to_list.isra.12+0x8b/0x8b
? add_lock_to_list.isra.12+0x8b/0x8b
? __lock_acquire+0xf77/0x10b4
__lock_acquire+0xf77/0x10b4
lock_acquire+0x174/0x19f
? afs_begin_vnode_operation+0x33/0x77 [kafs]
__mutex_lock+0x86/0x7d2
? afs_begin_vnode_operation+0x33/0x77 [kafs]
? afs_begin_vnode_operation+0x33/0x77 [kafs]
? afs_begin_vnode_operation+0x33/0x77 [kafs]
afs_begin_vnode_operation+0x33/0x77 [kafs]
afs_fetch_data+0x80/0x12a [kafs]
afs_readpages+0x314/0x405 [kafs]
__do_page_cache_readahead+0x203/0x2ba
? filemap_fault+0x179/0x54d
filemap_fault+0x179/0x54d
__do_fault+0x17/0x60
__handle_mm_fault+0x6d7/0x95c
handle_mm_fault+0x24e/0x2a3
__do_page_fault+0x301/0x486
do_page_fault+0x236/0x259
page_fault+0x22/0x30
RIP: 0010:__clear_user+0x3d/0x60
RSP: 0018:ffff880071e93da0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000011c RCX: 000000000000011c
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 000000000060f720
RBP: 000000000060f720 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffff8800b5459b68 R12: ffff8800ce150e00
R13: 000000000060f720 R14: 00000000006127a8 R15: 0000000000000000
padzero+0x1c/0x2b
load_elf_binary+0x785/0xdc7
search_binary_handler+0x81/0x1ff
do_execveat_common.isra.14+0x600/0x888
do_execve+0x1f/0x21
SyS_execve+0x28/0x2f
do_syscall_64+0x89/0x1be
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x7fdb6009ee07
RSP: 002b:00007fff566d9728 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055ba57280900 RCX: 00007fdb6009ee07
RDX: 000055ba5727f270 RSI: 000055ba5727cac0 RDI: 000055ba57280900
RBP: 000055ba57280900 R08: 00007fff566d9700 R09: 0000000000000000
R10: 000055ba5727cac0 R11: 0000000000000246 R12: 0000000000000000
R13: 000055ba5727cac0 R14: 000055ba5727f270 R15: 0000000000000000
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/ar-internal.h | 2 +-
net/rxrpc/call_accept.c | 2 +-
net/rxrpc/call_object.c | 19 +++++++++++++++----
3 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index b2151993d384..a972887b3f5d 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -672,7 +672,7 @@ extern unsigned int rxrpc_max_call_lifetime;
extern struct kmem_cache *rxrpc_call_jar;
struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
-struct rxrpc_call *rxrpc_alloc_call(gfp_t);
+struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t);
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
struct rxrpc_conn_parameters *,
struct sockaddr_rxrpc *,
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index cbd1701e813a..3028298ca561 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -94,7 +94,7 @@ static int rxrpc_service_prealloc_one(struct rxrpc_sock *rx,
/* Now it gets complicated, because calls get registered with the
* socket here, particularly if a user ID is preassigned by the user.
*/
- call = rxrpc_alloc_call(gfp);
+ call = rxrpc_alloc_call(rx, gfp);
if (!call)
return -ENOMEM;
call->flags |= (1 << RXRPC_CALL_IS_SERVICE);
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 4c7fbc6dcce7..1f141dc08ad2 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -55,6 +55,8 @@ static void rxrpc_call_timer_expired(unsigned long _call)
rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real());
}
+static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
+
/*
* find an extant server call
* - called in process context with IRQs enabled
@@ -95,7 +97,7 @@ struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
/*
* allocate a new call
*/
-struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
+struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp)
{
struct rxrpc_call *call;
@@ -114,6 +116,14 @@ struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
goto nomem_2;
mutex_init(&call->user_mutex);
+
+ /* Prevent lockdep reporting a deadlock false positive between the afs
+ * filesystem and sys_sendmsg() via the mmap sem.
+ */
+ if (rx->sk.sk_kern_sock)
+ lockdep_set_class(&call->user_mutex,
+ &rxrpc_call_user_mutex_lock_class_key);
+
setup_timer(&call->timer, rxrpc_call_timer_expired,
(unsigned long)call);
INIT_WORK(&call->processor, &rxrpc_process_call);
@@ -151,7 +161,8 @@ struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
/*
* Allocate a new client call.
*/
-static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
+static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
+ struct sockaddr_rxrpc *srx,
gfp_t gfp)
{
struct rxrpc_call *call;
@@ -159,7 +170,7 @@ static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
_enter("");
- call = rxrpc_alloc_call(gfp);
+ call = rxrpc_alloc_call(rx, gfp);
if (!call)
return ERR_PTR(-ENOMEM);
call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
@@ -210,7 +221,7 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
_enter("%p,%lx", rx, user_call_ID);
- call = rxrpc_alloc_client_call(srx, gfp);
+ call = rxrpc_alloc_client_call(rx, srx, gfp);
if (IS_ERR(call)) {
release_sock(&rx->sk);
_leave(" = %ld", PTR_ERR(call));
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 04/12] rxrpc: Delay terminal ACK transmission on a client call
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (2 preceding siblings ...)
2017-11-24 14:38 ` [PATCH net-next 03/12] rxrpc: Provide a different lockdep key for call->user_mutex for kernel calls David Howells
@ 2017-11-24 14:38 ` David Howells
2017-11-24 14:38 ` [PATCH net-next 05/12] rxrpc: Split the call params from the operation params David Howells
` (8 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:38 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
Delay terminal ACK transmission on a client call by deferring it to the
connection processor. This allows it to be skipped if we can send the next
call instead, the first DATA packet of which will implicitly ack this call.
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/ar-internal.h | 17 +++++++++++
net/rxrpc/conn_client.c | 18 +++++++++++
net/rxrpc/conn_event.c | 74 +++++++++++++++++++++++++++++++++++++++--------
net/rxrpc/conn_object.c | 10 ++++++
net/rxrpc/recvmsg.c | 2 +
5 files changed, 108 insertions(+), 13 deletions(-)
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index a972887b3f5d..d1213d503f30 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -338,8 +338,17 @@ enum rxrpc_conn_flag {
RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
RXRPC_CONN_COUNTED, /* Counted by rxrpc_nr_client_conns */
RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
+ RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
+ RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
+ RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
+ RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
};
+#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
+ (1UL << RXRPC_CONN_FINAL_ACK_1) | \
+ (1UL << RXRPC_CONN_FINAL_ACK_2) | \
+ (1UL << RXRPC_CONN_FINAL_ACK_3))
+
/*
* Events that can be raised upon a connection.
*/
@@ -393,6 +402,7 @@ struct rxrpc_connection {
#define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
struct list_head waiting_calls; /* Calls waiting for channels */
struct rxrpc_channel {
+ unsigned long final_ack_at; /* Time at which to issue final ACK */
struct rxrpc_call __rcu *call; /* Active call */
u32 call_id; /* ID of current call */
u32 call_counter; /* Call ID counter */
@@ -404,6 +414,7 @@ struct rxrpc_connection {
};
} channels[RXRPC_MAXCALLS];
+ struct timer_list timer; /* Conn event timer */
struct work_struct processor; /* connection event processor */
union {
struct rb_node client_node; /* Node in local->client_conns */
@@ -861,6 +872,12 @@ static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
rxrpc_put_service_conn(conn);
}
+static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
+ unsigned long expire_at)
+{
+ timer_reduce(&conn->timer, expire_at);
+}
+
/*
* conn_service.c
*/
diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c
index 5f9624bd311c..cfb997593da9 100644
--- a/net/rxrpc/conn_client.c
+++ b/net/rxrpc/conn_client.c
@@ -554,6 +554,11 @@ static void rxrpc_activate_one_channel(struct rxrpc_connection *conn,
trace_rxrpc_client(conn, channel, rxrpc_client_chan_activate);
+ /* Cancel the final ACK on the previous call if it hasn't been sent yet
+ * as the DATA packet will implicitly ACK it.
+ */
+ clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
+
write_lock_bh(&call->state_lock);
if (!test_bit(RXRPC_CALL_TX_LASTQ, &call->flags))
call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
@@ -813,6 +818,19 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call)
goto out_2;
}
+ /* Schedule the final ACK to be transmitted in a short while so that it
+ * can be skipped if we find a follow-on call. The first DATA packet
+ * of the follow on call will implicitly ACK this call.
+ */
+ if (test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
+ unsigned long final_ack_at = jiffies + 2;
+
+ WRITE_ONCE(chan->final_ack_at, final_ack_at);
+ smp_wmb(); /* vs rxrpc_process_delayed_final_acks() */
+ set_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
+ rxrpc_reduce_conn_timer(conn, final_ack_at);
+ }
+
/* Things are more complex and we need the cache lock. We might be
* able to simply idle the conn or it might now be lurking on the wait
* list. It might even get moved back to the active list whilst we're
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c
index 59a51a56e7c8..9e9a8db1bc9c 100644
--- a/net/rxrpc/conn_event.c
+++ b/net/rxrpc/conn_event.c
@@ -24,9 +24,10 @@
* Retransmit terminal ACK or ABORT of the previous call.
*/
static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
- struct sk_buff *skb)
+ struct sk_buff *skb,
+ unsigned int channel)
{
- struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL;
struct rxrpc_channel *chan;
struct msghdr msg;
struct kvec iov;
@@ -48,7 +49,7 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
_enter("%d", conn->debug_id);
- chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];
+ chan = &conn->channels[channel];
/* If the last call got moved on whilst we were waiting to run, just
* ignore this packet.
@@ -56,7 +57,7 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
call_id = READ_ONCE(chan->last_call);
/* Sync with __rxrpc_disconnect_call() */
smp_rmb();
- if (call_id != sp->hdr.callNumber)
+ if (skb && call_id != sp->hdr.callNumber)
return;
msg.msg_name = &conn->params.peer->srx.transport;
@@ -65,9 +66,9 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
msg.msg_controllen = 0;
msg.msg_flags = 0;
- pkt.whdr.epoch = htonl(sp->hdr.epoch);
- pkt.whdr.cid = htonl(sp->hdr.cid);
- pkt.whdr.callNumber = htonl(sp->hdr.callNumber);
+ pkt.whdr.epoch = htonl(conn->proto.epoch);
+ pkt.whdr.cid = htonl(conn->proto.cid);
+ pkt.whdr.callNumber = htonl(call_id);
pkt.whdr.seq = 0;
pkt.whdr.type = chan->last_type;
pkt.whdr.flags = conn->out_clientflag;
@@ -87,11 +88,11 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
mtu = conn->params.peer->if_mtu;
mtu -= conn->params.peer->hdrsize;
pkt.ack.bufferSpace = 0;
- pkt.ack.maxSkew = htons(skb->priority);
- pkt.ack.firstPacket = htonl(chan->last_seq);
- pkt.ack.previousPacket = htonl(chan->last_seq - 1);
- pkt.ack.serial = htonl(sp->hdr.serial);
- pkt.ack.reason = RXRPC_ACK_DUPLICATE;
+ pkt.ack.maxSkew = htons(skb ? skb->priority : 0);
+ pkt.ack.firstPacket = htonl(chan->last_seq + 1);
+ pkt.ack.previousPacket = htonl(chan->last_seq);
+ pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0);
+ pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
pkt.ack.nAcks = 0;
pkt.info.rxMTU = htonl(rxrpc_rx_mtu);
pkt.info.maxMTU = htonl(mtu);
@@ -272,7 +273,8 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
switch (sp->hdr.type) {
case RXRPC_PACKET_TYPE_DATA:
case RXRPC_PACKET_TYPE_ACK:
- rxrpc_conn_retransmit_call(conn, skb);
+ rxrpc_conn_retransmit_call(conn, skb,
+ sp->hdr.cid & RXRPC_CHANNELMASK);
return 0;
case RXRPC_PACKET_TYPE_BUSY:
@@ -379,6 +381,48 @@ static void rxrpc_secure_connection(struct rxrpc_connection *conn)
}
/*
+ * Process delayed final ACKs that we haven't subsumed into a subsequent call.
+ */
+static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn)
+{
+ unsigned long j = jiffies, next_j;
+ unsigned int channel;
+ bool set;
+
+again:
+ next_j = j + LONG_MAX;
+ set = false;
+ for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
+ struct rxrpc_channel *chan = &conn->channels[channel];
+ unsigned long ack_at;
+
+ if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
+ continue;
+
+ smp_rmb(); /* vs rxrpc_disconnect_client_call */
+ ack_at = READ_ONCE(chan->final_ack_at);
+
+ if (time_before(j, ack_at)) {
+ if (time_before(ack_at, next_j)) {
+ next_j = ack_at;
+ set = true;
+ }
+ continue;
+ }
+
+ if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
+ &conn->flags))
+ rxrpc_conn_retransmit_call(conn, NULL, channel);
+ }
+
+ j = jiffies;
+ if (time_before_eq(next_j, j))
+ goto again;
+ if (set)
+ rxrpc_reduce_conn_timer(conn, next_j);
+}
+
+/*
* connection-level event processor
*/
void rxrpc_process_connection(struct work_struct *work)
@@ -394,6 +438,10 @@ void rxrpc_process_connection(struct work_struct *work)
if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
rxrpc_secure_connection(conn);
+ /* Process delayed ACKs whose time has come. */
+ if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
+ rxrpc_process_delayed_final_acks(conn);
+
/* go through the conn-level event packets, releasing the ref on this
* connection that each one has when we've finished with it */
while ((skb = skb_dequeue(&conn->rx_queue))) {
diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index fe575798592f..a01a3791f06a 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -24,6 +24,14 @@ unsigned int rxrpc_connection_expiry = 10 * 60;
static void rxrpc_destroy_connection(struct rcu_head *);
+static void rxrpc_connection_timer(struct timer_list *timer)
+{
+ struct rxrpc_connection *conn =
+ container_of(timer, struct rxrpc_connection, timer);
+
+ rxrpc_queue_conn(conn);
+}
+
/*
* allocate a new connection
*/
@@ -38,6 +46,7 @@ struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp)
INIT_LIST_HEAD(&conn->cache_link);
spin_lock_init(&conn->channel_lock);
INIT_LIST_HEAD(&conn->waiting_calls);
+ timer_setup(&conn->timer, &rxrpc_connection_timer, 0);
INIT_WORK(&conn->processor, &rxrpc_process_connection);
INIT_LIST_HEAD(&conn->proc_link);
INIT_LIST_HEAD(&conn->link);
@@ -332,6 +341,7 @@ static void rxrpc_destroy_connection(struct rcu_head *rcu)
_net("DESTROY CONN %d", conn->debug_id);
+ del_timer_sync(&conn->timer);
rxrpc_purge_queue(&conn->rx_queue);
conn->security->clear(conn);
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 8510a98b87e1..be0b9ae13893 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -144,11 +144,13 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call, rxrpc_serial_t serial)
trace_rxrpc_receive(call, rxrpc_receive_end, 0, call->rx_top);
ASSERTCMP(call->rx_hard_ack, ==, call->rx_top);
+#if 0 // TODO: May want to transmit final ACK under some circumstances anyway
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_ack_packet(call, false);
}
+#endif
write_lock_bh(&call->state_lock);
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 05/12] rxrpc: Split the call params from the operation params
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (3 preceding siblings ...)
2017-11-24 14:38 ` [PATCH net-next 04/12] rxrpc: Delay terminal ACK transmission on a client call David Howells
@ 2017-11-24 14:38 ` David Howells
2017-11-24 14:38 ` [PATCH net-next 06/12] rxrpc: Fix call timeouts David Howells
` (7 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:38 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
When rxrpc_sendmsg() parses the control message buffer, it places the
parameters extracted into a structure, but lumps together call parameters
(such as user call ID) with operation parameters (such as whether to send
data, send an abort or accept a call).
Split the call parameters out into their own structure, a copy of which is
then embedded in the operation parameters struct.
The call parameters struct is then passed down into the places that need it
instead of passing the individual parameters. This allows for extra call
parameters to be added.
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/af_rxrpc.c | 8 ++++++-
net/rxrpc/ar-internal.h | 31 ++++++++++++++++++++++++++++-
net/rxrpc/call_object.c | 15 ++++++--------
net/rxrpc/sendmsg.c | 51 ++++++++++++++++-------------------------------
4 files changed, 60 insertions(+), 45 deletions(-)
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 9b5c46b052fd..c0cdcf980ffc 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -285,6 +285,7 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
bool upgrade)
{
struct rxrpc_conn_parameters cp;
+ struct rxrpc_call_params p;
struct rxrpc_call *call;
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
int ret;
@@ -302,6 +303,10 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
if (key && !key->payload.data[0])
key = NULL; /* a no-security key */
+ memset(&p, 0, sizeof(p));
+ p.user_call_ID = user_call_ID;
+ p.tx_total_len = tx_total_len;
+
memset(&cp, 0, sizeof(cp));
cp.local = rx->local;
cp.key = key;
@@ -309,8 +314,7 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
cp.exclusive = false;
cp.upgrade = upgrade;
cp.service_id = srx->srx_service;
- call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, tx_total_len,
- gfp);
+ call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp);
/* The socket has been unlocked. */
if (!IS_ERR(call)) {
call->notify_rx = notify_rx;
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index d1213d503f30..ba63f2231107 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -643,6 +643,35 @@ struct rxrpc_ack_summary {
u8 cumulative_acks;
};
+/*
+ * sendmsg() cmsg-specified parameters.
+ */
+enum rxrpc_command {
+ RXRPC_CMD_SEND_DATA, /* send data message */
+ RXRPC_CMD_SEND_ABORT, /* request abort generation */
+ RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
+ RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
+};
+
+struct rxrpc_call_params {
+ s64 tx_total_len; /* Total Tx data length (if send data) */
+ unsigned long user_call_ID; /* User's call ID */
+ struct {
+ u32 hard; /* Maximum lifetime (sec) */
+ u32 idle; /* Max time since last data packet (msec) */
+ u32 normal; /* Max time since last call packet (msec) */
+ } timeouts;
+ u8 nr_timeouts; /* Number of timeouts specified */
+};
+
+struct rxrpc_send_params {
+ struct rxrpc_call_params call;
+ u32 abort_code; /* Abort code to Tx (if abort) */
+ enum rxrpc_command command : 8; /* The command to implement */
+ bool exclusive; /* Shared or exclusive call */
+ bool upgrade; /* If the connection is upgradeable */
+};
+
#include <trace/events/rxrpc.h>
/*
@@ -687,7 +716,7 @@ struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t);
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
struct rxrpc_conn_parameters *,
struct sockaddr_rxrpc *,
- unsigned long, s64, gfp_t);
+ struct rxrpc_call_params *, gfp_t);
int rxrpc_retry_client_call(struct rxrpc_sock *,
struct rxrpc_call *,
struct rxrpc_conn_parameters *,
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 1f141dc08ad2..c3e1fa854471 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -208,8 +208,7 @@ static void rxrpc_start_call_timer(struct rxrpc_call *call)
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
struct rxrpc_conn_parameters *cp,
struct sockaddr_rxrpc *srx,
- unsigned long user_call_ID,
- s64 tx_total_len,
+ struct rxrpc_call_params *p,
gfp_t gfp)
__releases(&rx->sk.sk_lock.slock)
{
@@ -219,7 +218,7 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
const void *here = __builtin_return_address(0);
int ret;
- _enter("%p,%lx", rx, user_call_ID);
+ _enter("%p,%lx", rx, p->user_call_ID);
call = rxrpc_alloc_client_call(rx, srx, gfp);
if (IS_ERR(call)) {
@@ -228,9 +227,9 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
return call;
}
- call->tx_total_len = tx_total_len;
+ call->tx_total_len = p->tx_total_len;
trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
- here, (const void *)user_call_ID);
+ here, (const void *)p->user_call_ID);
/* We need to protect a partially set up call against the user as we
* will be acting outside the socket lock.
@@ -246,16 +245,16 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
parent = *pp;
xcall = rb_entry(parent, struct rxrpc_call, sock_node);
- if (user_call_ID < xcall->user_call_ID)
+ if (p->user_call_ID < xcall->user_call_ID)
pp = &(*pp)->rb_left;
- else if (user_call_ID > xcall->user_call_ID)
+ else if (p->user_call_ID > xcall->user_call_ID)
pp = &(*pp)->rb_right;
else
goto error_dup_user_ID;
}
rcu_assign_pointer(call->socket, rx);
- call->user_call_ID = user_call_ID;
+ call->user_call_ID = p->user_call_ID;
__set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
rxrpc_get_call(call, rxrpc_call_got_userid);
rb_link_node(&call->sock_node, parent, pp);
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 94555c94b2d8..de5ab327c18a 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -21,22 +21,6 @@
#include <net/af_rxrpc.h>
#include "ar-internal.h"
-enum rxrpc_command {
- RXRPC_CMD_SEND_DATA, /* send data message */
- RXRPC_CMD_SEND_ABORT, /* request abort generation */
- RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
- RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
-};
-
-struct rxrpc_send_params {
- s64 tx_total_len; /* Total Tx data length (if send data) */
- unsigned long user_call_ID; /* User's call ID */
- u32 abort_code; /* Abort code to Tx (if abort) */
- enum rxrpc_command command : 8; /* The command to implement */
- bool exclusive; /* Shared or exclusive call */
- bool upgrade; /* If the connection is upgradeable */
-};
-
/*
* Wait for space to appear in the Tx queue or a signal to occur.
*/
@@ -480,11 +464,11 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
if (msg->msg_flags & MSG_CMSG_COMPAT) {
if (len != sizeof(u32))
return -EINVAL;
- p->user_call_ID = *(u32 *)CMSG_DATA(cmsg);
+ p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
} else {
if (len != sizeof(unsigned long))
return -EINVAL;
- p->user_call_ID = *(unsigned long *)
+ p->call.user_call_ID = *(unsigned long *)
CMSG_DATA(cmsg);
}
got_user_ID = true;
@@ -522,10 +506,10 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
break;
case RXRPC_TX_LENGTH:
- if (p->tx_total_len != -1 || len != sizeof(__s64))
+ if (p->call.tx_total_len != -1 || len != sizeof(__s64))
return -EINVAL;
- p->tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
- if (p->tx_total_len < 0)
+ p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
+ if (p->call.tx_total_len < 0)
return -EINVAL;
break;
@@ -536,7 +520,7 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
if (!got_user_ID)
return -EINVAL;
- if (p->tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
+ if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
return -EINVAL;
_leave(" = 0");
return 0;
@@ -576,8 +560,7 @@ rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
cp.exclusive = rx->exclusive | p->exclusive;
cp.upgrade = p->upgrade;
cp.service_id = srx->srx_service;
- call = rxrpc_new_client_call(rx, &cp, srx, p->user_call_ID,
- p->tx_total_len, GFP_KERNEL);
+ call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL);
/* The socket is now unlocked */
_leave(" = %p\n", call);
@@ -597,12 +580,12 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
int ret;
struct rxrpc_send_params p = {
- .tx_total_len = -1,
- .user_call_ID = 0,
- .abort_code = 0,
- .command = RXRPC_CMD_SEND_DATA,
- .exclusive = false,
- .upgrade = false,
+ .call.tx_total_len = -1,
+ .call.user_call_ID = 0,
+ .abort_code = 0,
+ .command = RXRPC_CMD_SEND_DATA,
+ .exclusive = false,
+ .upgrade = false,
};
_enter("");
@@ -615,7 +598,7 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
ret = -EINVAL;
if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
goto error_release_sock;
- call = rxrpc_accept_call(rx, p.user_call_ID, NULL);
+ call = rxrpc_accept_call(rx, p.call.user_call_ID, NULL);
/* The socket is now unlocked. */
if (IS_ERR(call))
return PTR_ERR(call);
@@ -623,7 +606,7 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
goto out_put_unlock;
}
- call = rxrpc_find_call_by_user_ID(rx, p.user_call_ID);
+ call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
if (!call) {
ret = -EBADSLT;
if (p.command != RXRPC_CMD_SEND_DATA)
@@ -653,13 +636,13 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
goto error_put;
}
- if (p.tx_total_len != -1) {
+ if (p.call.tx_total_len != -1) {
ret = -EINVAL;
if (call->tx_total_len != -1 ||
call->tx_pending ||
call->tx_top != 0)
goto error_put;
- call->tx_total_len = p.tx_total_len;
+ call->tx_total_len = p.call.tx_total_len;
}
}
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 06/12] rxrpc: Fix call timeouts
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (4 preceding siblings ...)
2017-11-24 14:38 ` [PATCH net-next 05/12] rxrpc: Split the call params from the operation params David Howells
@ 2017-11-24 14:38 ` David Howells
2017-11-24 14:38 ` [PATCH net-next 07/12] rxrpc: Don't transmit DELAY ACKs immediately on proposal David Howells
` (6 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:38 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
Fix the rxrpc call expiration timeouts and make them settable from
userspace. By analogy with other rx implementations, there should be three
timeouts:
(1) "Normal timeout"
This is set for all calls and is triggered if we haven't received any
packets from the peer in a while. It is measured from the last time
we received any packet on that call. This is not reset by any
connection packets (such as CHALLENGE/RESPONSE packets).
If a service operation takes a long time, the server should generate
PING ACKs at a duration that's substantially less than the normal
timeout so is to keep both sides alive. This is set at 1/6 of normal
timeout.
(2) "Idle timeout"
This is set only for a service call and is triggered if we stop
receiving the DATA packets that comprise the request data. It is
measured from the last time we received a DATA packet.
(3) "Hard timeout"
This can be set for a call and specified the maximum lifetime of that
call. It should not be specified by default. Some operations (such
as volume transfer) take a long time.
Allow userspace to set/change the timeouts on a call with sendmsg, using a
control message:
RXRPC_SET_CALL_TIMEOUTS
The data to the message is a number of 32-bit words, not all of which need
be given:
u32 hard_timeout; /* sec from first packet */
u32 idle_timeout; /* msec from packet Rx */
u32 normal_timeout; /* msec from data Rx */
This can be set in combination with any other sendmsg() that affects a
call.
Signed-off-by: David Howells <dhowells@redhat.com>
---
include/trace/events/rxrpc.h | 69 +++++++++++-----
include/uapi/linux/rxrpc.h | 1
net/rxrpc/ar-internal.h | 37 ++++++---
net/rxrpc/call_event.c | 179 ++++++++++++++++++++----------------------
net/rxrpc/call_object.c | 27 ++++--
net/rxrpc/conn_client.c | 4 -
net/rxrpc/input.c | 34 +++++++-
net/rxrpc/misc.c | 19 ++--
net/rxrpc/recvmsg.c | 2
net/rxrpc/sendmsg.c | 59 +++++++++++---
net/rxrpc/sysctl.c | 60 +++++++-------
11 files changed, 290 insertions(+), 201 deletions(-)
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index ebe96796027a..01dcbc2164b5 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -138,10 +138,20 @@ enum rxrpc_rtt_rx_trace {
enum rxrpc_timer_trace {
rxrpc_timer_begin,
+ rxrpc_timer_exp_ack,
+ rxrpc_timer_exp_hard,
+ rxrpc_timer_exp_idle,
+ rxrpc_timer_exp_normal,
+ rxrpc_timer_exp_ping,
+ rxrpc_timer_exp_resend,
rxrpc_timer_expired,
rxrpc_timer_init_for_reply,
rxrpc_timer_init_for_send_reply,
+ rxrpc_timer_restart,
rxrpc_timer_set_for_ack,
+ rxrpc_timer_set_for_hard,
+ rxrpc_timer_set_for_idle,
+ rxrpc_timer_set_for_normal,
rxrpc_timer_set_for_ping,
rxrpc_timer_set_for_resend,
rxrpc_timer_set_for_send,
@@ -296,12 +306,22 @@ enum rxrpc_congest_change {
#define rxrpc_timer_traces \
EM(rxrpc_timer_begin, "Begin ") \
EM(rxrpc_timer_expired, "*EXPR*") \
+ EM(rxrpc_timer_exp_ack, "ExpAck") \
+ EM(rxrpc_timer_exp_hard, "ExpHrd") \
+ EM(rxrpc_timer_exp_idle, "ExpIdl") \
+ EM(rxrpc_timer_exp_normal, "ExpNml") \
+ EM(rxrpc_timer_exp_ping, "ExpPng") \
+ EM(rxrpc_timer_exp_resend, "ExpRsn") \
EM(rxrpc_timer_init_for_reply, "IniRpl") \
EM(rxrpc_timer_init_for_send_reply, "SndRpl") \
+ EM(rxrpc_timer_restart, "Restrt") \
EM(rxrpc_timer_set_for_ack, "SetAck") \
+ EM(rxrpc_timer_set_for_hard, "SetHrd") \
+ EM(rxrpc_timer_set_for_idle, "SetIdl") \
+ EM(rxrpc_timer_set_for_normal, "SetNml") \
EM(rxrpc_timer_set_for_ping, "SetPng") \
EM(rxrpc_timer_set_for_resend, "SetRTx") \
- E_(rxrpc_timer_set_for_send, "SetTx ")
+ E_(rxrpc_timer_set_for_send, "SetSnd")
#define rxrpc_propose_ack_traces \
EM(rxrpc_propose_ack_client_tx_end, "ClTxEnd") \
@@ -932,39 +952,44 @@ TRACE_EVENT(rxrpc_rtt_rx,
TRACE_EVENT(rxrpc_timer,
TP_PROTO(struct rxrpc_call *call, enum rxrpc_timer_trace why,
- ktime_t now, unsigned long now_j),
+ unsigned long now),
- TP_ARGS(call, why, now, now_j),
+ TP_ARGS(call, why, now),
TP_STRUCT__entry(
__field(struct rxrpc_call *, call )
__field(enum rxrpc_timer_trace, why )
- __field_struct(ktime_t, now )
- __field_struct(ktime_t, expire_at )
- __field_struct(ktime_t, ack_at )
- __field_struct(ktime_t, resend_at )
- __field(unsigned long, now_j )
- __field(unsigned long, timer )
+ __field(long, now )
+ __field(long, ack_at )
+ __field(long, resend_at )
+ __field(long, ping_at )
+ __field(long, expect_rx_by )
+ __field(long, expect_req_by )
+ __field(long, expect_term_by )
+ __field(long, timer )
),
TP_fast_assign(
- __entry->call = call;
- __entry->why = why;
- __entry->now = now;
- __entry->expire_at = call->expire_at;
- __entry->ack_at = call->ack_at;
- __entry->resend_at = call->resend_at;
- __entry->now_j = now_j;
- __entry->timer = call->timer.expires;
+ __entry->call = call;
+ __entry->why = why;
+ __entry->now = now;
+ __entry->ack_at = call->ack_at;
+ __entry->resend_at = call->resend_at;
+ __entry->expect_rx_by = call->expect_rx_by;
+ __entry->expect_req_by = call->expect_req_by;
+ __entry->expect_term_by = call->expect_term_by;
+ __entry->timer = call->timer.expires;
),
- TP_printk("c=%p %s x=%lld a=%lld r=%lld t=%ld",
+ TP_printk("c=%p %s a=%ld r=%ld xr=%ld xq=%ld xt=%ld t=%ld",
__entry->call,
__print_symbolic(__entry->why, rxrpc_timer_traces),
- ktime_to_ns(ktime_sub(__entry->expire_at, __entry->now)),
- ktime_to_ns(ktime_sub(__entry->ack_at, __entry->now)),
- ktime_to_ns(ktime_sub(__entry->resend_at, __entry->now)),
- __entry->timer - __entry->now_j)
+ __entry->ack_at - __entry->now,
+ __entry->resend_at - __entry->now,
+ __entry->expect_rx_by - __entry->now,
+ __entry->expect_req_by - __entry->now,
+ __entry->expect_term_by - __entry->now,
+ __entry->timer - __entry->now)
);
TRACE_EVENT(rxrpc_rx_lose,
diff --git a/include/uapi/linux/rxrpc.h b/include/uapi/linux/rxrpc.h
index 9d4afea308a4..9335d92c14a4 100644
--- a/include/uapi/linux/rxrpc.h
+++ b/include/uapi/linux/rxrpc.h
@@ -59,6 +59,7 @@ enum rxrpc_cmsg_type {
RXRPC_EXCLUSIVE_CALL = 10, /* s-: Call should be on exclusive connection */
RXRPC_UPGRADE_SERVICE = 11, /* s-: Request service upgrade for client call */
RXRPC_TX_LENGTH = 12, /* s-: Total length of Tx data */
+ RXRPC_SET_CALL_TIMEOUT = 13, /* s-: Set one or more call timeouts */
RXRPC__SUPPORTED
};
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index ba63f2231107..548411371048 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -468,9 +468,9 @@ enum rxrpc_call_flag {
enum rxrpc_call_event {
RXRPC_CALL_EV_ACK, /* need to generate ACK */
RXRPC_CALL_EV_ABORT, /* need to generate abort */
- RXRPC_CALL_EV_TIMER, /* Timer expired */
RXRPC_CALL_EV_RESEND, /* Tx resend required */
RXRPC_CALL_EV_PING, /* Ping send required */
+ RXRPC_CALL_EV_EXPIRED, /* Expiry occurred */
};
/*
@@ -514,10 +514,14 @@ struct rxrpc_call {
struct rxrpc_peer *peer; /* Peer record for remote address */
struct rxrpc_sock __rcu *socket; /* socket responsible */
struct mutex user_mutex; /* User access mutex */
- ktime_t ack_at; /* When deferred ACK needs to happen */
- ktime_t resend_at; /* When next resend needs to happen */
- ktime_t ping_at; /* When next to send a ping */
- ktime_t expire_at; /* When the call times out */
+ unsigned long ack_at; /* When deferred ACK needs to happen */
+ unsigned long resend_at; /* When next resend needs to happen */
+ unsigned long ping_at; /* When next to send a ping */
+ unsigned long expect_rx_by; /* When we expect to get a packet by */
+ unsigned long expect_req_by; /* When we expect to get a request DATA packet by */
+ unsigned long expect_term_by; /* When we expect call termination by */
+ u32 next_rx_timo; /* Timeout for next Rx packet (jif) */
+ u32 next_req_timo; /* Timeout for next Rx request packet (jif) */
struct timer_list timer; /* Combined event timer */
struct work_struct processor; /* Event processor */
rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
@@ -697,12 +701,19 @@ int rxrpc_reject_call(struct rxrpc_sock *);
/*
* call_event.c
*/
-void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
-void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
enum rxrpc_propose_ack_trace);
void rxrpc_process_call(struct work_struct *);
+static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
+ unsigned long expire_at,
+ unsigned long now,
+ enum rxrpc_timer_trace why)
+{
+ trace_rxrpc_timer(call, why, now);
+ timer_reduce(&call->timer, expire_at);
+}
+
/*
* call_object.c
*/
@@ -843,8 +854,8 @@ static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
*/
extern unsigned int rxrpc_max_client_connections;
extern unsigned int rxrpc_reap_client_connections;
-extern unsigned int rxrpc_conn_idle_client_expiry;
-extern unsigned int rxrpc_conn_idle_client_fast_expiry;
+extern unsigned long rxrpc_conn_idle_client_expiry;
+extern unsigned long rxrpc_conn_idle_client_fast_expiry;
extern struct idr rxrpc_client_conn_ids;
void rxrpc_destroy_client_conn_ids(void);
@@ -976,13 +987,13 @@ static inline void rxrpc_queue_local(struct rxrpc_local *local)
* misc.c
*/
extern unsigned int rxrpc_max_backlog __read_mostly;
-extern unsigned int rxrpc_requested_ack_delay;
-extern unsigned int rxrpc_soft_ack_delay;
-extern unsigned int rxrpc_idle_ack_delay;
+extern unsigned long rxrpc_requested_ack_delay;
+extern unsigned long rxrpc_soft_ack_delay;
+extern unsigned long rxrpc_idle_ack_delay;
extern unsigned int rxrpc_rx_window_size;
extern unsigned int rxrpc_rx_mtu;
extern unsigned int rxrpc_rx_jumbo_max;
-extern unsigned int rxrpc_resend_timeout;
+extern unsigned long rxrpc_resend_timeout;
extern const s8 rxrpc_ack_priority[];
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index 3574508baf9a..c14395d5ad8c 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -22,80 +22,6 @@
#include "ar-internal.h"
/*
- * Set the timer
- */
-void __rxrpc_set_timer(struct rxrpc_call *call, enum rxrpc_timer_trace why,
- ktime_t now)
-{
- unsigned long t_j, now_j = jiffies;
- ktime_t t;
- bool queue = false;
-
- if (call->state < RXRPC_CALL_COMPLETE) {
- t = call->expire_at;
- if (!ktime_after(t, now)) {
- trace_rxrpc_timer(call, why, now, now_j);
- queue = true;
- goto out;
- }
-
- if (!ktime_after(call->resend_at, now)) {
- call->resend_at = call->expire_at;
- if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
- queue = true;
- } else if (ktime_before(call->resend_at, t)) {
- t = call->resend_at;
- }
-
- if (!ktime_after(call->ack_at, now)) {
- call->ack_at = call->expire_at;
- if (!test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events))
- queue = true;
- } else if (ktime_before(call->ack_at, t)) {
- t = call->ack_at;
- }
-
- if (!ktime_after(call->ping_at, now)) {
- call->ping_at = call->expire_at;
- if (!test_and_set_bit(RXRPC_CALL_EV_PING, &call->events))
- queue = true;
- } else if (ktime_before(call->ping_at, t)) {
- t = call->ping_at;
- }
-
- t_j = nsecs_to_jiffies(ktime_to_ns(ktime_sub(t, now)));
- t_j += jiffies;
-
- /* We have to make sure that the calculated jiffies value falls
- * at or after the nsec value, or we may loop ceaselessly
- * because the timer times out, but we haven't reached the nsec
- * timeout yet.
- */
- t_j++;
-
- if (call->timer.expires != t_j || !timer_pending(&call->timer)) {
- mod_timer(&call->timer, t_j);
- trace_rxrpc_timer(call, why, now, now_j);
- }
- }
-
-out:
- if (queue)
- rxrpc_queue_call(call);
-}
-
-/*
- * Set the timer
- */
-void rxrpc_set_timer(struct rxrpc_call *call, enum rxrpc_timer_trace why,
- ktime_t now)
-{
- read_lock_bh(&call->state_lock);
- __rxrpc_set_timer(call, why, now);
- read_unlock_bh(&call->state_lock);
-}
-
-/*
* Propose a PING ACK be sent.
*/
static void rxrpc_propose_ping(struct rxrpc_call *call,
@@ -106,12 +32,13 @@ static void rxrpc_propose_ping(struct rxrpc_call *call,
!test_and_set_bit(RXRPC_CALL_EV_PING, &call->events))
rxrpc_queue_call(call);
} else {
- ktime_t now = ktime_get_real();
- ktime_t ping_at = ktime_add_ms(now, rxrpc_idle_ack_delay);
+ unsigned long now = jiffies;
+ unsigned long ping_at = now + rxrpc_idle_ack_delay;
- if (ktime_before(ping_at, call->ping_at)) {
- call->ping_at = ping_at;
- rxrpc_set_timer(call, rxrpc_timer_set_for_ping, now);
+ if (time_before(ping_at, call->ping_at)) {
+ WRITE_ONCE(call->ping_at, ping_at);
+ rxrpc_reduce_call_timer(call, ping_at, now,
+ rxrpc_timer_set_for_ping);
}
}
}
@@ -125,8 +52,7 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
enum rxrpc_propose_ack_trace why)
{
enum rxrpc_propose_ack_outcome outcome = rxrpc_propose_ack_use;
- unsigned int expiry = rxrpc_soft_ack_delay;
- ktime_t now, ack_at;
+ unsigned long now, ack_at, expiry = rxrpc_soft_ack_delay;
s8 prior = rxrpc_ack_priority[ack_reason];
/* Pings are handled specially because we don't want to accidentally
@@ -190,11 +116,12 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
background)
rxrpc_queue_call(call);
} else {
- now = ktime_get_real();
- ack_at = ktime_add_ms(now, expiry);
- if (ktime_before(ack_at, call->ack_at)) {
- call->ack_at = ack_at;
- rxrpc_set_timer(call, rxrpc_timer_set_for_ack, now);
+ now = jiffies;
+ ack_at = jiffies + expiry;
+ if (time_before(ack_at, call->ack_at)) {
+ WRITE_ONCE(call->ack_at, ack_at);
+ rxrpc_reduce_call_timer(call, ack_at, now,
+ rxrpc_timer_set_for_ack);
}
}
@@ -227,18 +154,20 @@ static void rxrpc_congestion_timeout(struct rxrpc_call *call)
/*
* Perform retransmission of NAK'd and unack'd packets.
*/
-static void rxrpc_resend(struct rxrpc_call *call, ktime_t now)
+static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
{
struct rxrpc_skb_priv *sp;
struct sk_buff *skb;
+ unsigned long resend_at;
rxrpc_seq_t cursor, seq, top;
- ktime_t max_age, oldest, ack_ts;
+ ktime_t now, max_age, oldest, ack_ts;
int ix;
u8 annotation, anno_type, retrans = 0, unacked = 0;
_enter("{%d,%d}", call->tx_hard_ack, call->tx_top);
- max_age = ktime_sub_ms(now, rxrpc_resend_timeout);
+ now = ktime_get_real();
+ max_age = ktime_sub_ms(now, rxrpc_resend_timeout * 1000 / HZ);
spin_lock_bh(&call->lock);
@@ -282,7 +211,9 @@ static void rxrpc_resend(struct rxrpc_call *call, ktime_t now)
ktime_to_ns(ktime_sub(skb->tstamp, max_age)));
}
- call->resend_at = ktime_add_ms(oldest, rxrpc_resend_timeout);
+ resend_at = nsecs_to_jiffies(ktime_to_ns(ktime_sub(oldest, now)));
+ resend_at += jiffies + rxrpc_resend_timeout;
+ WRITE_ONCE(call->resend_at, resend_at);
if (unacked)
rxrpc_congestion_timeout(call);
@@ -292,7 +223,8 @@ static void rxrpc_resend(struct rxrpc_call *call, ktime_t now)
* retransmitting data.
*/
if (!retrans) {
- rxrpc_set_timer(call, rxrpc_timer_set_for_resend, now);
+ rxrpc_reduce_call_timer(call, resend_at, now,
+ rxrpc_timer_set_for_resend);
spin_unlock_bh(&call->lock);
ack_ts = ktime_sub(now, call->acks_latest_ts);
if (ktime_to_ns(ack_ts) < call->peer->rtt)
@@ -364,7 +296,7 @@ void rxrpc_process_call(struct work_struct *work)
{
struct rxrpc_call *call =
container_of(work, struct rxrpc_call, processor);
- ktime_t now;
+ unsigned long now, next, t;
rxrpc_see_call(call);
@@ -384,8 +316,50 @@ void rxrpc_process_call(struct work_struct *work)
goto out_put;
}
- now = ktime_get_real();
- if (ktime_before(call->expire_at, now)) {
+ /* Work out if any timeouts tripped */
+ now = jiffies;
+ t = READ_ONCE(call->expect_rx_by);
+ if (time_after_eq(now, t)) {
+ trace_rxrpc_timer(call, rxrpc_timer_exp_normal, now);
+ set_bit(RXRPC_CALL_EV_EXPIRED, &call->events);
+ }
+
+ t = READ_ONCE(call->expect_req_by);
+ if (call->state == RXRPC_CALL_SERVER_RECV_REQUEST &&
+ time_after_eq(now, t)) {
+ trace_rxrpc_timer(call, rxrpc_timer_exp_idle, now);
+ set_bit(RXRPC_CALL_EV_EXPIRED, &call->events);
+ }
+
+ t = READ_ONCE(call->expect_term_by);
+ if (time_after_eq(now, t)) {
+ trace_rxrpc_timer(call, rxrpc_timer_exp_hard, now);
+ set_bit(RXRPC_CALL_EV_EXPIRED, &call->events);
+ }
+
+ t = READ_ONCE(call->ack_at);
+ if (time_after_eq(now, t)) {
+ trace_rxrpc_timer(call, rxrpc_timer_exp_ack, now);
+ cmpxchg(&call->ack_at, t, now + MAX_JIFFY_OFFSET);
+ set_bit(RXRPC_CALL_EV_ACK, &call->events);
+ }
+
+ t = READ_ONCE(call->ping_at);
+ if (time_after_eq(now, t)) {
+ trace_rxrpc_timer(call, rxrpc_timer_exp_ping, now);
+ cmpxchg(&call->ping_at, t, now + MAX_JIFFY_OFFSET);
+ set_bit(RXRPC_CALL_EV_PING, &call->events);
+ }
+
+ t = READ_ONCE(call->resend_at);
+ if (time_after_eq(now, t)) {
+ trace_rxrpc_timer(call, rxrpc_timer_exp_resend, now);
+ cmpxchg(&call->resend_at, t, now + MAX_JIFFY_OFFSET);
+ set_bit(RXRPC_CALL_EV_RESEND, &call->events);
+ }
+
+ /* Process events */
+ if (test_and_clear_bit(RXRPC_CALL_EV_EXPIRED, &call->events)) {
rxrpc_abort_call("EXP", call, 0, RX_USER_ABORT, -ETIME);
set_bit(RXRPC_CALL_EV_ABORT, &call->events);
goto recheck_state;
@@ -408,7 +382,22 @@ void rxrpc_process_call(struct work_struct *work)
goto recheck_state;
}
- rxrpc_set_timer(call, rxrpc_timer_set_for_resend, now);
+ /* Make sure the timer is restarted */
+ next = call->expect_rx_by;
+
+#define set(T) { t = READ_ONCE(T); if (time_before(t, next)) next = t; }
+
+ set(call->expect_req_by);
+ set(call->expect_term_by);
+ set(call->ack_at);
+ set(call->resend_at);
+ set(call->ping_at);
+
+ now = jiffies;
+ if (time_after_eq(now, next))
+ goto recheck_state;
+
+ rxrpc_reduce_call_timer(call, next, now, rxrpc_timer_restart);
/* other events may have been raised since we started checking */
if (call->events && call->state < RXRPC_CALL_COMPLETE) {
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index c3e1fa854471..b305970a9b63 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -51,8 +51,10 @@ static void rxrpc_call_timer_expired(unsigned long _call)
_enter("%d", call->debug_id);
- if (call->state < RXRPC_CALL_COMPLETE)
- rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real());
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies);
+ rxrpc_queue_call(call);
+ }
}
static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
@@ -139,6 +141,8 @@ struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp)
atomic_set(&call->usage, 1);
call->debug_id = atomic_inc_return(&rxrpc_debug_id);
call->tx_total_len = -1;
+ call->next_rx_timo = 20 * HZ;
+ call->next_req_timo = 1 * HZ;
memset(&call->sock_node, 0xed, sizeof(call->sock_node));
@@ -189,15 +193,16 @@ static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
*/
static void rxrpc_start_call_timer(struct rxrpc_call *call)
{
- ktime_t now = ktime_get_real(), expire_at;
-
- expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime);
- call->expire_at = expire_at;
- call->ack_at = expire_at;
- call->ping_at = expire_at;
- call->resend_at = expire_at;
- call->timer.expires = jiffies + LONG_MAX / 2;
- rxrpc_set_timer(call, rxrpc_timer_begin, now);
+ unsigned long now = jiffies;
+ unsigned long j = now + MAX_JIFFY_OFFSET;
+
+ call->ack_at = j;
+ call->resend_at = j;
+ call->ping_at = j;
+ call->expect_rx_by = j;
+ call->expect_req_by = j;
+ call->expect_term_by = j;
+ call->timer.expires = now;
}
/*
diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c
index cfb997593da9..97f6a8de4845 100644
--- a/net/rxrpc/conn_client.c
+++ b/net/rxrpc/conn_client.c
@@ -85,8 +85,8 @@
__read_mostly unsigned int rxrpc_max_client_connections = 1000;
__read_mostly unsigned int rxrpc_reap_client_connections = 900;
-__read_mostly unsigned int rxrpc_conn_idle_client_expiry = 2 * 60 * HZ;
-__read_mostly unsigned int rxrpc_conn_idle_client_fast_expiry = 2 * HZ;
+__read_mostly unsigned long rxrpc_conn_idle_client_expiry = 2 * 60 * HZ;
+__read_mostly unsigned long rxrpc_conn_idle_client_fast_expiry = 2 * HZ;
/*
* We use machine-unique IDs for our client connections.
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 1b592073ec96..c89647eae86d 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -318,16 +318,18 @@ static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
static bool rxrpc_receiving_reply(struct rxrpc_call *call)
{
struct rxrpc_ack_summary summary = { 0 };
+ unsigned long now, timo;
rxrpc_seq_t top = READ_ONCE(call->tx_top);
if (call->ackr_reason) {
spin_lock_bh(&call->lock);
call->ackr_reason = 0;
- call->resend_at = call->expire_at;
- call->ack_at = call->expire_at;
spin_unlock_bh(&call->lock);
- rxrpc_set_timer(call, rxrpc_timer_init_for_reply,
- ktime_get_real());
+ now = jiffies;
+ timo = now + MAX_JIFFY_OFFSET;
+ WRITE_ONCE(call->resend_at, timo);
+ WRITE_ONCE(call->ack_at, timo);
+ trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now);
}
if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags))
@@ -437,6 +439,19 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb,
if (state >= RXRPC_CALL_COMPLETE)
return;
+ if (call->state == RXRPC_CALL_SERVER_RECV_REQUEST) {
+ unsigned long timo = READ_ONCE(call->next_req_timo);
+ unsigned long now, expect_req_by;
+
+ if (timo) {
+ now = jiffies;
+ expect_req_by = now + timo;
+ WRITE_ONCE(call->expect_req_by, expect_req_by);
+ rxrpc_reduce_call_timer(call, expect_req_by, now,
+ rxrpc_timer_set_for_idle);
+ }
+ }
+
/* Received data implicitly ACKs all of the request packets we sent
* when we're acting as a client.
*/
@@ -908,9 +923,20 @@ static void rxrpc_input_call_packet(struct rxrpc_call *call,
struct sk_buff *skb, u16 skew)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ unsigned long timo;
_enter("%p,%p", call, skb);
+ timo = READ_ONCE(call->next_rx_timo);
+ if (timo) {
+ unsigned long now = jiffies, expect_rx_by;
+
+ expect_rx_by = jiffies + timo;
+ WRITE_ONCE(call->expect_rx_by, expect_rx_by);
+ rxrpc_reduce_call_timer(call, expect_rx_by, now,
+ rxrpc_timer_set_for_normal);
+ }
+
switch (sp->hdr.type) {
case RXRPC_PACKET_TYPE_DATA:
rxrpc_input_data(call, skb, skew);
diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c
index 1a2d4b112064..c1d9e7fd7448 100644
--- a/net/rxrpc/misc.c
+++ b/net/rxrpc/misc.c
@@ -21,33 +21,28 @@
unsigned int rxrpc_max_backlog __read_mostly = 10;
/*
- * Maximum lifetime of a call (in mx).
- */
-unsigned int rxrpc_max_call_lifetime = 60 * 1000;
-
-/*
* How long to wait before scheduling ACK generation after seeing a
- * packet with RXRPC_REQUEST_ACK set (in ms).
+ * packet with RXRPC_REQUEST_ACK set (in jiffies).
*/
-unsigned int rxrpc_requested_ack_delay = 1;
+unsigned long rxrpc_requested_ack_delay = 1;
/*
- * How long to wait before scheduling an ACK with subtype DELAY (in ms).
+ * How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
*
* We use this when we've received new data packets. If those packets aren't
* all consumed within this time we will send a DELAY ACK if an ACK was not
* requested to let the sender know it doesn't need to resend.
*/
-unsigned int rxrpc_soft_ack_delay = 1 * 1000;
+unsigned long rxrpc_soft_ack_delay = HZ;
/*
- * How long to wait before scheduling an ACK with subtype IDLE (in ms).
+ * How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
*
* We use this when we've consumed some previously soft-ACK'd packets when
* further packets aren't immediately received to decide when to send an IDLE
* ACK let the other end know that it can free up its Tx buffer space.
*/
-unsigned int rxrpc_idle_ack_delay = 0.5 * 1000;
+unsigned long rxrpc_idle_ack_delay = HZ / 2;
/*
* Receive window size in packets. This indicates the maximum number of
@@ -75,7 +70,7 @@ unsigned int rxrpc_rx_jumbo_max = 4;
/*
* Time till packet resend (in milliseconds).
*/
-unsigned int rxrpc_resend_timeout = 4 * 1000;
+unsigned long rxrpc_resend_timeout = 4 * HZ;
const s8 rxrpc_ack_priority[] = {
[0] = 0,
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index be0b9ae13893..0b6609da80b7 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -163,7 +163,7 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call, rxrpc_serial_t serial)
case RXRPC_CALL_SERVER_RECV_REQUEST:
call->tx_phase = true;
call->state = RXRPC_CALL_SERVER_ACK_REQUEST;
- call->ack_at = call->expire_at;
+ call->expect_req_by = jiffies + MAX_JIFFY_OFFSET;
write_unlock_bh(&call->state_lock);
rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, 0, serial, false, true,
rxrpc_propose_ack_processing_op);
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index de5ab327c18a..03e0676db28c 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -158,6 +158,7 @@ static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
rxrpc_notify_end_tx_t notify_end_tx)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ unsigned long now;
rxrpc_seq_t seq = sp->hdr.seq;
int ret, ix;
u8 annotation = RXRPC_TX_ANNO_UNACK;
@@ -197,11 +198,11 @@ static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
break;
case RXRPC_CALL_SERVER_ACK_REQUEST:
call->state = RXRPC_CALL_SERVER_SEND_REPLY;
- call->ack_at = call->expire_at;
+ now = jiffies;
+ WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET);
if (call->ackr_reason == RXRPC_ACK_DELAY)
call->ackr_reason = 0;
- __rxrpc_set_timer(call, rxrpc_timer_init_for_send_reply,
- ktime_get_real());
+ trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now);
if (!last)
break;
/* Fall through */
@@ -223,14 +224,12 @@ static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
_debug("need instant resend %d", ret);
rxrpc_instant_resend(call, ix);
} else {
- ktime_t now = ktime_get_real(), resend_at;
+ unsigned long now = jiffies, resend_at;
- resend_at = ktime_add_ms(now, rxrpc_resend_timeout);
-
- if (ktime_before(resend_at, call->resend_at)) {
- call->resend_at = resend_at;
- rxrpc_set_timer(call, rxrpc_timer_set_for_send, now);
- }
+ resend_at = now + rxrpc_resend_timeout;
+ WRITE_ONCE(call->resend_at, resend_at);
+ rxrpc_reduce_call_timer(call, resend_at, now,
+ rxrpc_timer_set_for_send);
}
rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
@@ -513,6 +512,19 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
return -EINVAL;
break;
+ case RXRPC_SET_CALL_TIMEOUT:
+ if (len & 3 || len < 4 || len > 12)
+ return -EINVAL;
+ memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
+ p->call.nr_timeouts = len / 4;
+ if (p->call.timeouts.hard > INT_MAX / HZ)
+ return -ERANGE;
+ if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
+ return -ERANGE;
+ if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
+ return -ERANGE;
+ break;
+
default:
return -EINVAL;
}
@@ -577,11 +589,13 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
{
enum rxrpc_call_state state;
struct rxrpc_call *call;
+ unsigned long now, j;
int ret;
struct rxrpc_send_params p = {
.call.tx_total_len = -1,
.call.user_call_ID = 0,
+ .call.nr_timeouts = 0,
.abort_code = 0,
.command = RXRPC_CMD_SEND_DATA,
.exclusive = false,
@@ -646,6 +660,31 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
}
}
+ switch (p.call.nr_timeouts) {
+ case 3:
+ j = msecs_to_jiffies(p.call.timeouts.normal);
+ if (p.call.timeouts.normal > 0 && j == 0)
+ j = 1;
+ WRITE_ONCE(call->next_rx_timo, j);
+ /* Fall through */
+ case 2:
+ j = msecs_to_jiffies(p.call.timeouts.idle);
+ if (p.call.timeouts.idle > 0 && j == 0)
+ j = 1;
+ WRITE_ONCE(call->next_req_timo, j);
+ /* Fall through */
+ case 1:
+ if (p.call.timeouts.hard > 0) {
+ j = msecs_to_jiffies(p.call.timeouts.hard);
+ now = jiffies;
+ j += now;
+ WRITE_ONCE(call->expect_term_by, j);
+ rxrpc_reduce_call_timer(call, j, now,
+ rxrpc_timer_set_for_hard);
+ }
+ break;
+ }
+
state = READ_ONCE(call->state);
_debug("CALL %d USR %lx ST %d on CONN %p",
call->debug_id, call->user_call_ID, state, call->conn);
diff --git a/net/rxrpc/sysctl.c b/net/rxrpc/sysctl.c
index 34c706d2f79c..4a7af7aff37d 100644
--- a/net/rxrpc/sysctl.c
+++ b/net/rxrpc/sysctl.c
@@ -21,6 +21,8 @@ static const unsigned int four = 4;
static const unsigned int thirtytwo = 32;
static const unsigned int n_65535 = 65535;
static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1;
+static const unsigned long one_jiffy = 1;
+static const unsigned long max_jiffies = MAX_JIFFY_OFFSET;
/*
* RxRPC operating parameters.
@@ -29,64 +31,60 @@ static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1;
* information on the individual parameters.
*/
static struct ctl_table rxrpc_sysctl_table[] = {
- /* Values measured in milliseconds */
+ /* Values measured in milliseconds but used in jiffies */
{
.procname = "req_ack_delay",
.data = &rxrpc_requested_ack_delay,
- .maxlen = sizeof(unsigned int),
+ .maxlen = sizeof(unsigned long),
.mode = 0644,
- .proc_handler = proc_dointvec,
- .extra1 = (void *)&zero,
+ .proc_handler = proc_doulongvec_ms_jiffies_minmax,
+ .extra1 = (void *)&one_jiffy,
+ .extra2 = (void *)&max_jiffies,
},
{
.procname = "soft_ack_delay",
.data = &rxrpc_soft_ack_delay,
- .maxlen = sizeof(unsigned int),
+ .maxlen = sizeof(unsigned long),
.mode = 0644,
- .proc_handler = proc_dointvec,
- .extra1 = (void *)&one,
+ .proc_handler = proc_doulongvec_ms_jiffies_minmax,
+ .extra1 = (void *)&one_jiffy,
+ .extra2 = (void *)&max_jiffies,
},
{
.procname = "idle_ack_delay",
.data = &rxrpc_idle_ack_delay,
- .maxlen = sizeof(unsigned int),
+ .maxlen = sizeof(unsigned long),
.mode = 0644,
- .proc_handler = proc_dointvec,
- .extra1 = (void *)&one,
- },
- {
- .procname = "resend_timeout",
- .data = &rxrpc_resend_timeout,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- .extra1 = (void *)&one,
+ .proc_handler = proc_doulongvec_ms_jiffies_minmax,
+ .extra1 = (void *)&one_jiffy,
+ .extra2 = (void *)&max_jiffies,
},
{
.procname = "idle_conn_expiry",
.data = &rxrpc_conn_idle_client_expiry,
- .maxlen = sizeof(unsigned int),
+ .maxlen = sizeof(unsigned long),
.mode = 0644,
- .proc_handler = proc_dointvec_ms_jiffies,
- .extra1 = (void *)&one,
+ .proc_handler = proc_doulongvec_ms_jiffies_minmax,
+ .extra1 = (void *)&one_jiffy,
+ .extra2 = (void *)&max_jiffies,
},
{
.procname = "idle_conn_fast_expiry",
.data = &rxrpc_conn_idle_client_fast_expiry,
- .maxlen = sizeof(unsigned int),
+ .maxlen = sizeof(unsigned long),
.mode = 0644,
- .proc_handler = proc_dointvec_ms_jiffies,
- .extra1 = (void *)&one,
+ .proc_handler = proc_doulongvec_ms_jiffies_minmax,
+ .extra1 = (void *)&one_jiffy,
+ .extra2 = (void *)&max_jiffies,
},
-
- /* Values measured in seconds but used in jiffies */
{
- .procname = "max_call_lifetime",
- .data = &rxrpc_max_call_lifetime,
- .maxlen = sizeof(unsigned int),
+ .procname = "resend_timeout",
+ .data = &rxrpc_resend_timeout,
+ .maxlen = sizeof(unsigned long),
.mode = 0644,
- .proc_handler = proc_dointvec,
- .extra1 = (void *)&one,
+ .proc_handler = proc_doulongvec_ms_jiffies_minmax,
+ .extra1 = (void *)&one_jiffy,
+ .extra2 = (void *)&max_jiffies,
},
/* Non-time values */
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 07/12] rxrpc: Don't transmit DELAY ACKs immediately on proposal
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (5 preceding siblings ...)
2017-11-24 14:38 ` [PATCH net-next 06/12] rxrpc: Fix call timeouts David Howells
@ 2017-11-24 14:38 ` David Howells
2017-11-24 14:38 ` [PATCH net-next 08/12] rxrpc: Express protocol timeouts in terms of RTT David Howells
` (5 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:38 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
Don't transmit a DELAY ACK immediately on proposal when the Rx window is
rotated, but rather defer it to the work function. This means that we have
a chance to queue/consume more received packets before we actually send the
DELAY ACK, or even cancel it entirely, thereby reducing the number of
packets transmitted.
We do, however, want to continue sending other types of packet immediately,
particularly REQUESTED ACKs, as they may be used for RTT calculation by the
other side.
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/recvmsg.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 0b6609da80b7..fad5f42a3abd 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -219,9 +219,9 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
after_eq(top, call->ackr_seen + 2) ||
(hard_ack == top && after(hard_ack, call->ackr_consumed)))
rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, 0, serial,
- true, false,
+ true, true,
rxrpc_propose_ack_rotate_rx);
- if (call->ackr_reason)
+ if (call->ackr_reason && call->ackr_reason != RXRPC_ACK_DELAY)
rxrpc_send_ack_packet(call, false);
}
}
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 08/12] rxrpc: Express protocol timeouts in terms of RTT
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (6 preceding siblings ...)
2017-11-24 14:38 ` [PATCH net-next 07/12] rxrpc: Don't transmit DELAY ACKs immediately on proposal David Howells
@ 2017-11-24 14:38 ` David Howells
2017-11-24 14:38 ` [PATCH net-next 09/12] rxrpc: Add a timeout for detecting lost ACKs/lost DATA David Howells
` (4 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:38 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
Express protocol timeouts for data retransmission and deferred ack
generation in terms on RTT rather than specified timeouts once we have
sufficient RTT samples.
For the moment, this requires just one RTT sample to be able to use this
for ack deferral and two for data retransmission.
The data retransmission timeout is set at RTT*1.5 and the ACK deferral
timeout is set at RTT.
Note that the calculated timeout is limited to a minimum of 4ns to make
sure it doesn't happen too quickly.
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/call_event.c | 22 ++++++++++++++++++----
net/rxrpc/sendmsg.c | 7 +++++++
2 files changed, 25 insertions(+), 4 deletions(-)
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index c14395d5ad8c..da91f16ac77c 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -52,7 +52,7 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
enum rxrpc_propose_ack_trace why)
{
enum rxrpc_propose_ack_outcome outcome = rxrpc_propose_ack_use;
- unsigned long now, ack_at, expiry = rxrpc_soft_ack_delay;
+ unsigned long expiry = rxrpc_soft_ack_delay;
s8 prior = rxrpc_ack_priority[ack_reason];
/* Pings are handled specially because we don't want to accidentally
@@ -116,7 +116,13 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
background)
rxrpc_queue_call(call);
} else {
- now = jiffies;
+ unsigned long now = jiffies, ack_at;
+
+ if (call->peer->rtt_usage > 0)
+ ack_at = nsecs_to_jiffies(call->peer->rtt);
+ else
+ ack_at = expiry;
+
ack_at = jiffies + expiry;
if (time_before(ack_at, call->ack_at)) {
WRITE_ONCE(call->ack_at, ack_at);
@@ -160,14 +166,22 @@ static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
struct sk_buff *skb;
unsigned long resend_at;
rxrpc_seq_t cursor, seq, top;
- ktime_t now, max_age, oldest, ack_ts;
+ ktime_t now, max_age, oldest, ack_ts, timeout, min_timeo;
int ix;
u8 annotation, anno_type, retrans = 0, unacked = 0;
_enter("{%d,%d}", call->tx_hard_ack, call->tx_top);
+ if (call->peer->rtt_usage > 1)
+ timeout = ns_to_ktime(call->peer->rtt * 3 / 2);
+ else
+ timeout = ms_to_ktime(rxrpc_resend_timeout);
+ min_timeo = ns_to_ktime((1000000000 / HZ) * 4);
+ if (ktime_before(timeout, min_timeo))
+ timeout = min_timeo;
+
now = ktime_get_real();
- max_age = ktime_sub_ms(now, rxrpc_resend_timeout * 1000 / HZ);
+ max_age = ktime_sub(now, timeout);
spin_lock_bh(&call->lock);
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 03e0676db28c..c56ee54fdd1f 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -226,6 +226,13 @@ static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
} else {
unsigned long now = jiffies, resend_at;
+ if (call->peer->rtt_usage > 1)
+ resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2);
+ else
+ resend_at = rxrpc_resend_timeout;
+ if (resend_at < 1)
+ resend_at = 1;
+
resend_at = now + rxrpc_resend_timeout;
WRITE_ONCE(call->resend_at, resend_at);
rxrpc_reduce_call_timer(call, resend_at, now,
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 09/12] rxrpc: Add a timeout for detecting lost ACKs/lost DATA
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (7 preceding siblings ...)
2017-11-24 14:38 ` [PATCH net-next 08/12] rxrpc: Express protocol timeouts in terms of RTT David Howells
@ 2017-11-24 14:38 ` David Howells
2017-11-24 14:38 ` [PATCH net-next 10/12] rxrpc: Add keepalive for a call David Howells
` (3 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:38 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
Add an extra timeout that is set/updated when we send a DATA packet that
has the request-ack flag set. This allows us to detect if we don't get an
ACK in response to the latest flagged packet.
The ACK packet is adjudged to have been lost if it doesn't turn up within
2*RTT of the transmission.
If the timeout occurs, we schedule the sending of a PING ACK to find out
the state of the other side. If a new DATA packet is ready to go sooner,
we cancel the sending of the ping and set the request-ack flag on that
instead.
If we get back a PING-RESPONSE ACK that indicates a lower tx_top than what
we had at the time of the ping transmission, we adjudge all the DATA
packets sent between the response tx_top and the ping-time tx_top to have
been lost and retransmit immediately.
Rather than sending a PING ACK, we could just pick a DATA packet and
speculatively retransmit that with request-ack set. It should result in
either a REQUESTED ACK or a DUPLICATE ACK which we can then use in lieu the
a PING-RESPONSE ACK mentioned above.
Signed-off-by: David Howells <dhowells@redhat.com>
---
include/trace/events/rxrpc.h | 11 +++++++++--
net/rxrpc/ar-internal.h | 6 +++++-
net/rxrpc/call_event.c | 26 ++++++++++++++++++++++----
net/rxrpc/call_object.c | 1 +
net/rxrpc/input.c | 40 ++++++++++++++++++++++++++++++++++++++++
net/rxrpc/output.c | 20 ++++++++++++++++++--
net/rxrpc/recvmsg.c | 4 ++--
net/rxrpc/sendmsg.c | 2 +-
8 files changed, 98 insertions(+), 12 deletions(-)
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 01dcbc2164b5..84ade8b76a19 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -141,6 +141,7 @@ enum rxrpc_timer_trace {
rxrpc_timer_exp_ack,
rxrpc_timer_exp_hard,
rxrpc_timer_exp_idle,
+ rxrpc_timer_exp_lost_ack,
rxrpc_timer_exp_normal,
rxrpc_timer_exp_ping,
rxrpc_timer_exp_resend,
@@ -151,6 +152,7 @@ enum rxrpc_timer_trace {
rxrpc_timer_set_for_ack,
rxrpc_timer_set_for_hard,
rxrpc_timer_set_for_idle,
+ rxrpc_timer_set_for_lost_ack,
rxrpc_timer_set_for_normal,
rxrpc_timer_set_for_ping,
rxrpc_timer_set_for_resend,
@@ -309,6 +311,7 @@ enum rxrpc_congest_change {
EM(rxrpc_timer_exp_ack, "ExpAck") \
EM(rxrpc_timer_exp_hard, "ExpHrd") \
EM(rxrpc_timer_exp_idle, "ExpIdl") \
+ EM(rxrpc_timer_exp_lost_ack, "ExpLoA") \
EM(rxrpc_timer_exp_normal, "ExpNml") \
EM(rxrpc_timer_exp_ping, "ExpPng") \
EM(rxrpc_timer_exp_resend, "ExpRsn") \
@@ -318,6 +321,7 @@ enum rxrpc_congest_change {
EM(rxrpc_timer_set_for_ack, "SetAck") \
EM(rxrpc_timer_set_for_hard, "SetHrd") \
EM(rxrpc_timer_set_for_idle, "SetIdl") \
+ EM(rxrpc_timer_set_for_lost_ack, "SetLoA") \
EM(rxrpc_timer_set_for_normal, "SetNml") \
EM(rxrpc_timer_set_for_ping, "SetPng") \
EM(rxrpc_timer_set_for_resend, "SetRTx") \
@@ -961,6 +965,7 @@ TRACE_EVENT(rxrpc_timer,
__field(enum rxrpc_timer_trace, why )
__field(long, now )
__field(long, ack_at )
+ __field(long, ack_lost_at )
__field(long, resend_at )
__field(long, ping_at )
__field(long, expect_rx_by )
@@ -974,6 +979,7 @@ TRACE_EVENT(rxrpc_timer,
__entry->why = why;
__entry->now = now;
__entry->ack_at = call->ack_at;
+ __entry->ack_lost_at = call->ack_lost_at;
__entry->resend_at = call->resend_at;
__entry->expect_rx_by = call->expect_rx_by;
__entry->expect_req_by = call->expect_req_by;
@@ -981,10 +987,11 @@ TRACE_EVENT(rxrpc_timer,
__entry->timer = call->timer.expires;
),
- TP_printk("c=%p %s a=%ld r=%ld xr=%ld xq=%ld xt=%ld t=%ld",
+ TP_printk("c=%p %s a=%ld la=%ld r=%ld xr=%ld xq=%ld xt=%ld t=%ld",
__entry->call,
__print_symbolic(__entry->why, rxrpc_timer_traces),
__entry->ack_at - __entry->now,
+ __entry->ack_lost_at - __entry->now,
__entry->resend_at - __entry->now,
__entry->expect_rx_by - __entry->now,
__entry->expect_req_by - __entry->now,
@@ -1105,7 +1112,7 @@ TRACE_EVENT(rxrpc_congest,
memcpy(&__entry->sum, summary, sizeof(__entry->sum));
),
- TP_printk("c=%p %08x %s %08x %s cw=%u ss=%u nr=%u,%u nw=%u,%u r=%u b=%u u=%u d=%u l=%x%s%s%s",
+ TP_printk("c=%p r=%08x %s q=%08x %s cw=%u ss=%u nr=%u,%u nw=%u,%u r=%u b=%u u=%u d=%u l=%x%s%s%s",
__entry->call,
__entry->ack_serial,
__print_symbolic(__entry->sum.ack_reason, rxrpc_ack_names),
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 548411371048..7e7b817c69f0 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -471,6 +471,7 @@ enum rxrpc_call_event {
RXRPC_CALL_EV_RESEND, /* Tx resend required */
RXRPC_CALL_EV_PING, /* Ping send required */
RXRPC_CALL_EV_EXPIRED, /* Expiry occurred */
+ RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */
};
/*
@@ -515,6 +516,7 @@ struct rxrpc_call {
struct rxrpc_sock __rcu *socket; /* socket responsible */
struct mutex user_mutex; /* User access mutex */
unsigned long ack_at; /* When deferred ACK needs to happen */
+ unsigned long ack_lost_at; /* When ACK is figured as lost */
unsigned long resend_at; /* When next resend needs to happen */
unsigned long ping_at; /* When next to send a ping */
unsigned long expect_rx_by; /* When we expect to get a packet by */
@@ -624,6 +626,8 @@ struct rxrpc_call {
ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
rxrpc_serial_t acks_latest; /* serial number of latest ACK received */
rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
+ rxrpc_seq_t acks_lost_top; /* tx_top at the time lost-ack ping sent */
+ rxrpc_serial_t acks_lost_ping; /* Serial number of probe ACK */
};
/*
@@ -1011,7 +1015,7 @@ static inline struct rxrpc_net *rxrpc_net(struct net *net)
/*
* output.c
*/
-int rxrpc_send_ack_packet(struct rxrpc_call *, bool);
+int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
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_event.c b/net/rxrpc/call_event.c
index da91f16ac77c..c65666b2f39e 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -245,7 +245,7 @@ static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
goto out;
rxrpc_propose_ACK(call, RXRPC_ACK_PING, 0, 0, true, false,
rxrpc_propose_ack_ping_for_lost_ack);
- rxrpc_send_ack_packet(call, true);
+ rxrpc_send_ack_packet(call, true, NULL);
goto out;
}
@@ -310,6 +310,7 @@ void rxrpc_process_call(struct work_struct *work)
{
struct rxrpc_call *call =
container_of(work, struct rxrpc_call, processor);
+ rxrpc_serial_t *send_ack;
unsigned long now, next, t;
rxrpc_see_call(call);
@@ -358,6 +359,13 @@ void rxrpc_process_call(struct work_struct *work)
set_bit(RXRPC_CALL_EV_ACK, &call->events);
}
+ t = READ_ONCE(call->ack_lost_at);
+ if (time_after_eq(now, t)) {
+ trace_rxrpc_timer(call, rxrpc_timer_exp_lost_ack, now);
+ cmpxchg(&call->ack_lost_at, t, now + MAX_JIFFY_OFFSET);
+ set_bit(RXRPC_CALL_EV_ACK_LOST, &call->events);
+ }
+
t = READ_ONCE(call->ping_at);
if (time_after_eq(now, t)) {
trace_rxrpc_timer(call, rxrpc_timer_exp_ping, now);
@@ -379,15 +387,24 @@ void rxrpc_process_call(struct work_struct *work)
goto recheck_state;
}
- if (test_and_clear_bit(RXRPC_CALL_EV_ACK, &call->events)) {
+ send_ack = NULL;
+ if (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events)) {
+ call->acks_lost_top = call->tx_top;
+ rxrpc_propose_ACK(call, RXRPC_ACK_PING, 0, 0, true, false,
+ rxrpc_propose_ack_ping_for_lost_ack);
+ send_ack = &call->acks_lost_ping;
+ }
+
+ if (test_and_clear_bit(RXRPC_CALL_EV_ACK, &call->events) ||
+ send_ack) {
if (call->ackr_reason) {
- rxrpc_send_ack_packet(call, false);
+ rxrpc_send_ack_packet(call, false, send_ack);
goto recheck_state;
}
}
if (test_and_clear_bit(RXRPC_CALL_EV_PING, &call->events)) {
- rxrpc_send_ack_packet(call, true);
+ rxrpc_send_ack_packet(call, true, NULL);
goto recheck_state;
}
@@ -404,6 +421,7 @@ void rxrpc_process_call(struct work_struct *work)
set(call->expect_req_by);
set(call->expect_term_by);
set(call->ack_at);
+ set(call->ack_lost_at);
set(call->resend_at);
set(call->ping_at);
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index b305970a9b63..7ee3d6ce5aa2 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -197,6 +197,7 @@ static void rxrpc_start_call_timer(struct rxrpc_call *call)
unsigned long j = now + MAX_JIFFY_OFFSET;
call->ack_at = j;
+ call->ack_lost_at = j;
call->resend_at = j;
call->ping_at = j;
call->expect_rx_by = j;
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index c89647eae86d..23a5e61d8f79 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -631,6 +631,43 @@ static void rxrpc_input_requested_ack(struct rxrpc_call *call,
}
/*
+ * Process the response to a ping that we sent to find out if we lost an ACK.
+ *
+ * If we got back a ping response that indicates a lower tx_top than what we
+ * had at the time of the ping transmission, we adjudge all the DATA packets
+ * sent between the response tx_top and the ping-time tx_top to have been lost.
+ */
+static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call)
+{
+ rxrpc_seq_t top, bottom, seq;
+ bool resend = false;
+
+ spin_lock_bh(&call->lock);
+
+ bottom = call->tx_hard_ack + 1;
+ top = call->acks_lost_top;
+ if (before(bottom, top)) {
+ for (seq = bottom; before_eq(seq, top); seq++) {
+ int ix = seq & RXRPC_RXTX_BUFF_MASK;
+ u8 annotation = call->rxtx_annotations[ix];
+ u8 anno_type = annotation & RXRPC_TX_ANNO_MASK;
+
+ if (anno_type != RXRPC_TX_ANNO_UNACK)
+ continue;
+ annotation &= ~RXRPC_TX_ANNO_MASK;
+ annotation |= RXRPC_TX_ANNO_RETRANS;
+ call->rxtx_annotations[ix] = annotation;
+ resend = true;
+ }
+ }
+
+ spin_unlock_bh(&call->lock);
+
+ if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
+ rxrpc_queue_call(call);
+}
+
+/*
* Process a ping response.
*/
static void rxrpc_input_ping_response(struct rxrpc_call *call,
@@ -645,6 +682,9 @@ static void rxrpc_input_ping_response(struct rxrpc_call *call,
smp_rmb();
ping_serial = call->ping_serial;
+ if (orig_serial == call->acks_lost_ping)
+ rxrpc_input_check_for_lost_ack(call);
+
if (!test_bit(RXRPC_CALL_PINGING, &call->flags) ||
before(orig_serial, ping_serial))
return;
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index f47659c7b224..efe06edce189 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -95,7 +95,8 @@ static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
/*
* Send an ACK call packet.
*/
-int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping)
+int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
+ rxrpc_serial_t *_serial)
{
struct rxrpc_connection *conn = NULL;
struct rxrpc_ack_buffer *pkt;
@@ -165,6 +166,8 @@ int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping)
ntohl(pkt->ack.firstPacket),
ntohl(pkt->ack.serial),
pkt->ack.reason, pkt->ack.nAcks);
+ if (_serial)
+ *_serial = serial;
if (ping) {
call->ping_serial = serial;
@@ -323,7 +326,8 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
* ACKs if a DATA packet appears to have been lost.
*/
if (!(sp->hdr.flags & RXRPC_LAST_PACKET) &&
- (retrans ||
+ (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) ||
+ 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),
@@ -370,6 +374,18 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
if (whdr.flags & RXRPC_REQUEST_ACK) {
call->peer->rtt_last_req = now;
trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial);
+ if (call->peer->rtt_usage > 1) {
+ unsigned long nowj = jiffies, ack_lost_at;
+
+ ack_lost_at = nsecs_to_jiffies(2 * call->peer->rtt);
+ if (ack_lost_at < 1)
+ ack_lost_at = 1;
+
+ ack_lost_at += nowj;
+ WRITE_ONCE(call->ack_lost_at, ack_lost_at);
+ rxrpc_reduce_call_timer(call, ack_lost_at, nowj,
+ rxrpc_timer_set_for_lost_ack);
+ }
}
}
_leave(" = %d [%u]", ret, call->peer->maxdata);
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index fad5f42a3abd..cc21e8db25b0 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -148,7 +148,7 @@ 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_ack_packet(call, false);
+ rxrpc_send_ack_packet(call, false, NULL);
}
#endif
@@ -222,7 +222,7 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
true, true,
rxrpc_propose_ack_rotate_rx);
if (call->ackr_reason && call->ackr_reason != RXRPC_ACK_DELAY)
- rxrpc_send_ack_packet(call, false);
+ rxrpc_send_ack_packet(call, false, NULL);
}
}
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index c56ee54fdd1f..a1c53ac066a1 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -285,7 +285,7 @@ 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_ack_packet(call, false);
+ rxrpc_send_ack_packet(call, false, NULL);
if (!skb) {
size_t size, chunk, max, space;
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 10/12] rxrpc: Add keepalive for a call
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (8 preceding siblings ...)
2017-11-24 14:38 ` [PATCH net-next 09/12] rxrpc: Add a timeout for detecting lost ACKs/lost DATA David Howells
@ 2017-11-24 14:38 ` David Howells
2017-11-24 14:38 ` [PATCH net-next 11/12] rxrpc: Fix service endpoint expiry David Howells
` (2 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:38 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
We need to transmit a packet every so often to act as a keepalive for the
peer (which has a timeout from the last time it received a packet) and also
to prevent any intervening firewalls from closing the route.
Do this by resetting a timer every time we transmit a packet. If the timer
ever expires, we transmit a PING ACK packet and thereby also elicit a PING
RESPONSE ACK from the other side - which prevents our last-rx timeout from
expiring.
The timer is set to 1/6 of the last-rx timeout so that we can detect the
other side going away if it misses 6 replies in a row.
This is particularly necessary for servers where the processing of the
service function may take a significant amount of time.
Signed-off-by: David Howells <dhowells@redhat.com>
---
include/trace/events/rxrpc.h | 6 ++++++
net/rxrpc/ar-internal.h | 1 +
net/rxrpc/call_event.c | 10 ++++++++++
net/rxrpc/output.c | 23 +++++++++++++++++++++++
4 files changed, 40 insertions(+)
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 84ade8b76a19..e98fed6de497 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -141,6 +141,7 @@ enum rxrpc_timer_trace {
rxrpc_timer_exp_ack,
rxrpc_timer_exp_hard,
rxrpc_timer_exp_idle,
+ rxrpc_timer_exp_keepalive,
rxrpc_timer_exp_lost_ack,
rxrpc_timer_exp_normal,
rxrpc_timer_exp_ping,
@@ -152,6 +153,7 @@ enum rxrpc_timer_trace {
rxrpc_timer_set_for_ack,
rxrpc_timer_set_for_hard,
rxrpc_timer_set_for_idle,
+ rxrpc_timer_set_for_keepalive,
rxrpc_timer_set_for_lost_ack,
rxrpc_timer_set_for_normal,
rxrpc_timer_set_for_ping,
@@ -162,6 +164,7 @@ enum rxrpc_timer_trace {
enum rxrpc_propose_ack_trace {
rxrpc_propose_ack_client_tx_end,
rxrpc_propose_ack_input_data,
+ rxrpc_propose_ack_ping_for_keepalive,
rxrpc_propose_ack_ping_for_lost_ack,
rxrpc_propose_ack_ping_for_lost_reply,
rxrpc_propose_ack_ping_for_params,
@@ -311,6 +314,7 @@ enum rxrpc_congest_change {
EM(rxrpc_timer_exp_ack, "ExpAck") \
EM(rxrpc_timer_exp_hard, "ExpHrd") \
EM(rxrpc_timer_exp_idle, "ExpIdl") \
+ EM(rxrpc_timer_exp_keepalive, "ExpKA ") \
EM(rxrpc_timer_exp_lost_ack, "ExpLoA") \
EM(rxrpc_timer_exp_normal, "ExpNml") \
EM(rxrpc_timer_exp_ping, "ExpPng") \
@@ -321,6 +325,7 @@ enum rxrpc_congest_change {
EM(rxrpc_timer_set_for_ack, "SetAck") \
EM(rxrpc_timer_set_for_hard, "SetHrd") \
EM(rxrpc_timer_set_for_idle, "SetIdl") \
+ EM(rxrpc_timer_set_for_keepalive, "KeepAl") \
EM(rxrpc_timer_set_for_lost_ack, "SetLoA") \
EM(rxrpc_timer_set_for_normal, "SetNml") \
EM(rxrpc_timer_set_for_ping, "SetPng") \
@@ -330,6 +335,7 @@ enum rxrpc_congest_change {
#define rxrpc_propose_ack_traces \
EM(rxrpc_propose_ack_client_tx_end, "ClTxEnd") \
EM(rxrpc_propose_ack_input_data, "DataIn ") \
+ EM(rxrpc_propose_ack_ping_for_keepalive, "KeepAlv") \
EM(rxrpc_propose_ack_ping_for_lost_ack, "LostAck") \
EM(rxrpc_propose_ack_ping_for_lost_reply, "LostRpl") \
EM(rxrpc_propose_ack_ping_for_params, "Params ") \
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 7e7b817c69f0..cdcbc798f921 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -519,6 +519,7 @@ struct rxrpc_call {
unsigned long ack_lost_at; /* When ACK is figured as lost */
unsigned long resend_at; /* When next resend needs to happen */
unsigned long ping_at; /* When next to send a ping */
+ unsigned long keepalive_at; /* When next to send a keepalive ping */
unsigned long expect_rx_by; /* When we expect to get a packet by */
unsigned long expect_req_by; /* When we expect to get a request DATA packet by */
unsigned long expect_term_by; /* When we expect call termination by */
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index c65666b2f39e..bda952ffe6a6 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -366,6 +366,15 @@ void rxrpc_process_call(struct work_struct *work)
set_bit(RXRPC_CALL_EV_ACK_LOST, &call->events);
}
+ t = READ_ONCE(call->keepalive_at);
+ if (time_after_eq(now, t)) {
+ trace_rxrpc_timer(call, rxrpc_timer_exp_keepalive, now);
+ cmpxchg(&call->keepalive_at, t, now + MAX_JIFFY_OFFSET);
+ rxrpc_propose_ACK(call, RXRPC_ACK_PING, 0, 0, true, true,
+ rxrpc_propose_ack_ping_for_keepalive);
+ set_bit(RXRPC_CALL_EV_PING, &call->events);
+ }
+
t = READ_ONCE(call->ping_at);
if (time_after_eq(now, t)) {
trace_rxrpc_timer(call, rxrpc_timer_exp_ping, now);
@@ -423,6 +432,7 @@ void rxrpc_process_call(struct work_struct *work)
set(call->ack_at);
set(call->ack_lost_at);
set(call->resend_at);
+ set(call->keepalive_at);
set(call->ping_at);
now = jiffies;
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index efe06edce189..42410e910aff 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -33,6 +33,24 @@ struct rxrpc_abort_buffer {
};
/*
+ * Arrange for a keepalive ping a certain time after we last transmitted. This
+ * lets the far side know we're still interested in this call and helps keep
+ * the route through any intervening firewall open.
+ *
+ * Receiving a response to the ping will prevent the ->expect_rx_by timer from
+ * expiring.
+ */
+static void rxrpc_set_keepalive(struct rxrpc_call *call)
+{
+ unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6;
+
+ keepalive_at += now;
+ WRITE_ONCE(call->keepalive_at, keepalive_at);
+ rxrpc_reduce_call_timer(call, keepalive_at, now,
+ rxrpc_timer_set_for_keepalive);
+}
+
+/*
* Fill out an ACK packet.
*/
static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
@@ -205,6 +223,8 @@ int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
call->ackr_seen = top;
spin_unlock_bh(&call->lock);
}
+
+ rxrpc_set_keepalive(call);
}
out:
@@ -388,6 +408,9 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
}
}
}
+
+ rxrpc_set_keepalive(call);
+
_leave(" = %d [%u]", ret, call->peer->maxdata);
return ret;
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 11/12] rxrpc: Fix service endpoint expiry
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (9 preceding siblings ...)
2017-11-24 14:38 ` [PATCH net-next 10/12] rxrpc: Add keepalive for a call David Howells
@ 2017-11-24 14:38 ` David Howells
2017-11-24 14:39 ` [PATCH net-next 12/12] rxrpc: Fix conn expiry timers David Howells
2017-11-24 20:05 ` [PATCH net-next 00/12] rxrpc: Fixes and improvements David Miller
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:38 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
RxRPC service endpoints expire like they're supposed to by the following
means:
(1) Mark dead rxrpc_net structs (with ->live) rather than twiddling the
global service conn timeout, otherwise the first rxrpc_net struct to
die will cause connections on all others to expire immediately from
then on.
(2) Mark local service endpoints for which the socket has been closed
(->service_closed) so that the expiration timeout can be much
shortened for service and client connections going through that
endpoint.
(3) rxrpc_put_service_conn() needs to schedule the reaper when the usage
count reaches 1, not 0, as idle conns have a 1 count.
(4) The accumulator for the earliest time we might want to schedule for
should be initialised to jiffies + MAX_JIFFY_OFFSET, not ULONG_MAX as
the comparison functions use signed arithmetic.
(5) Simplify the expiration handling, adding the expiration value to the
idle timestamp each time rather than keeping track of the time in the
past before which the idle timestamp must go to be expired. This is
much easier to read.
(6) Ignore the timeouts if the net namespace is dead.
(7) Restart the service reaper work item rather the client reaper.
Signed-off-by: David Howells <dhowells@redhat.com>
---
include/trace/events/rxrpc.h | 2 ++
net/rxrpc/af_rxrpc.c | 13 +++++++++++++
net/rxrpc/ar-internal.h | 3 +++
net/rxrpc/conn_client.c | 2 ++
net/rxrpc/conn_object.c | 42 ++++++++++++++++++++++++------------------
net/rxrpc/net_ns.c | 3 +++
6 files changed, 47 insertions(+), 18 deletions(-)
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index e98fed6de497..36cb50c111a6 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -49,6 +49,7 @@ enum rxrpc_conn_trace {
rxrpc_conn_put_client,
rxrpc_conn_put_service,
rxrpc_conn_queued,
+ rxrpc_conn_reap_service,
rxrpc_conn_seen,
};
@@ -221,6 +222,7 @@ enum rxrpc_congest_change {
EM(rxrpc_conn_put_client, "PTc") \
EM(rxrpc_conn_put_service, "PTs") \
EM(rxrpc_conn_queued, "QUE") \
+ EM(rxrpc_conn_reap_service, "RPs") \
E_(rxrpc_conn_seen, "SEE")
#define rxrpc_client_traces \
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index c0cdcf980ffc..abb524c2b8f8 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -867,6 +867,19 @@ static int rxrpc_release_sock(struct sock *sk)
sock_orphan(sk);
sk->sk_shutdown = SHUTDOWN_MASK;
+ /* We want to kill off all connections from a service socket
+ * as fast as possible because we can't share these; client
+ * sockets, on the other hand, can share an endpoint.
+ */
+ switch (sk->sk_state) {
+ case RXRPC_SERVER_BOUND:
+ case RXRPC_SERVER_BOUND2:
+ case RXRPC_SERVER_LISTENING:
+ case RXRPC_SERVER_LISTEN_DISABLED:
+ rx->local->service_closed = true;
+ break;
+ }
+
spin_lock_bh(&sk->sk_receive_queue.lock);
sk->sk_state = RXRPC_CLOSE;
spin_unlock_bh(&sk->sk_receive_queue.lock);
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index cdcbc798f921..a0082c407005 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -84,6 +84,7 @@ struct rxrpc_net {
unsigned int nr_client_conns;
unsigned int nr_active_client_conns;
bool kill_all_client_conns;
+ bool live;
spinlock_t client_conn_cache_lock; /* Lock for ->*_client_conns */
spinlock_t client_conn_discard_lock; /* Prevent multiple discarders */
struct list_head waiting_client_conns;
@@ -265,6 +266,7 @@ struct rxrpc_local {
rwlock_t services_lock; /* lock for services list */
int debug_id; /* debug ID for printks */
bool dead;
+ bool service_closed; /* Service socket closed */
struct sockaddr_rxrpc srx; /* local address */
};
@@ -881,6 +883,7 @@ void rxrpc_process_connection(struct work_struct *);
* conn_object.c
*/
extern unsigned int rxrpc_connection_expiry;
+extern unsigned int rxrpc_closed_conn_expiry;
struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c
index 97f6a8de4845..785dfdb9fef1 100644
--- a/net/rxrpc/conn_client.c
+++ b/net/rxrpc/conn_client.c
@@ -1079,6 +1079,8 @@ void rxrpc_discard_expired_client_conns(struct work_struct *work)
expiry = rxrpc_conn_idle_client_expiry;
if (nr_conns > rxrpc_reap_client_connections)
expiry = rxrpc_conn_idle_client_fast_expiry;
+ if (conn->params.local->service_closed)
+ expiry = rxrpc_closed_conn_expiry * HZ;
conn_expires_at = conn->idle_timestamp + expiry;
diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index a01a3791f06a..726eda6140ae 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -20,7 +20,8 @@
/*
* Time till a connection expires after last use (in seconds).
*/
-unsigned int rxrpc_connection_expiry = 10 * 60;
+unsigned int __read_mostly rxrpc_connection_expiry = 10 * 60;
+unsigned int __read_mostly rxrpc_closed_conn_expiry = 10;
static void rxrpc_destroy_connection(struct rcu_head *);
@@ -321,7 +322,7 @@ void rxrpc_put_service_conn(struct rxrpc_connection *conn)
n = atomic_dec_return(&conn->usage);
trace_rxrpc_conn(conn, rxrpc_conn_put_service, n, here);
ASSERTCMP(n, >=, 0);
- if (n == 0) {
+ if (n == 1) {
rxnet = conn->params.local->rxnet;
rxrpc_queue_delayed_work(&rxnet->service_conn_reaper, 0);
}
@@ -363,15 +364,14 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
struct rxrpc_net *rxnet =
container_of(to_delayed_work(work),
struct rxrpc_net, service_conn_reaper);
- unsigned long reap_older_than, earliest, idle_timestamp, now;
+ unsigned long expire_at, earliest, idle_timestamp, now;
LIST_HEAD(graveyard);
_enter("");
now = jiffies;
- reap_older_than = now - rxrpc_connection_expiry * HZ;
- earliest = ULONG_MAX;
+ earliest = now + MAX_JIFFY_OFFSET;
write_lock(&rxnet->conn_lock);
list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
@@ -381,15 +381,21 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
if (conn->state == RXRPC_CONN_SERVICE_PREALLOC)
continue;
- idle_timestamp = READ_ONCE(conn->idle_timestamp);
- _debug("reap CONN %d { u=%d,t=%ld }",
- conn->debug_id, atomic_read(&conn->usage),
- (long)reap_older_than - (long)idle_timestamp);
-
- if (time_after(idle_timestamp, reap_older_than)) {
- if (time_before(idle_timestamp, earliest))
- earliest = idle_timestamp;
- continue;
+ if (rxnet->live) {
+ idle_timestamp = READ_ONCE(conn->idle_timestamp);
+ expire_at = idle_timestamp + rxrpc_connection_expiry * HZ;
+ if (conn->params.local->service_closed)
+ expire_at = idle_timestamp + rxrpc_closed_conn_expiry * HZ;
+
+ _debug("reap CONN %d { u=%d,t=%ld }",
+ conn->debug_id, atomic_read(&conn->usage),
+ (long)expire_at - (long)now);
+
+ if (time_before(now, expire_at)) {
+ if (time_before(expire_at, earliest))
+ earliest = expire_at;
+ continue;
+ }
}
/* The usage count sits at 1 whilst the object is unused on the
@@ -397,6 +403,7 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
*/
if (atomic_cmpxchg(&conn->usage, 1, 0) != 1)
continue;
+ trace_rxrpc_conn(conn, rxrpc_conn_reap_service, 0, 0);
if (rxrpc_conn_is_client(conn))
BUG();
@@ -407,10 +414,10 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
}
write_unlock(&rxnet->conn_lock);
- if (earliest != ULONG_MAX) {
- _debug("reschedule reaper %ld", (long) earliest - now);
+ if (earliest != now + MAX_JIFFY_OFFSET) {
+ _debug("reschedule reaper %ld", (long)earliest - (long)now);
ASSERT(time_after(earliest, now));
- rxrpc_queue_delayed_work(&rxnet->client_conn_reaper,
+ rxrpc_queue_delayed_work(&rxnet->service_conn_reaper,
earliest - now);
}
@@ -439,7 +446,6 @@ void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet)
rxrpc_destroy_all_client_connections(rxnet);
- rxrpc_connection_expiry = 0;
cancel_delayed_work(&rxnet->client_conn_reaper);
rxrpc_queue_delayed_work(&rxnet->client_conn_reaper, 0);
flush_workqueue(rxrpc_workqueue);
diff --git a/net/rxrpc/net_ns.c b/net/rxrpc/net_ns.c
index 7edceb8522f5..684c51d600c7 100644
--- a/net/rxrpc/net_ns.c
+++ b/net/rxrpc/net_ns.c
@@ -22,6 +22,7 @@ static __net_init int rxrpc_init_net(struct net *net)
struct rxrpc_net *rxnet = rxrpc_net(net);
int ret;
+ rxnet->live = true;
get_random_bytes(&rxnet->epoch, sizeof(rxnet->epoch));
rxnet->epoch |= RXRPC_RANDOM_EPOCH;
@@ -60,6 +61,7 @@ static __net_init int rxrpc_init_net(struct net *net)
return 0;
err_proc:
+ rxnet->live = false;
return ret;
}
@@ -70,6 +72,7 @@ static __net_exit void rxrpc_exit_net(struct net *net)
{
struct rxrpc_net *rxnet = rxrpc_net(net);
+ rxnet->live = false;
rxrpc_destroy_all_calls(rxnet);
rxrpc_destroy_all_connections(rxnet);
rxrpc_destroy_all_locals(rxnet);
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH net-next 12/12] rxrpc: Fix conn expiry timers
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (10 preceding siblings ...)
2017-11-24 14:38 ` [PATCH net-next 11/12] rxrpc: Fix service endpoint expiry David Howells
@ 2017-11-24 14:39 ` David Howells
2017-11-24 20:05 ` [PATCH net-next 00/12] rxrpc: Fixes and improvements David Miller
12 siblings, 0 replies; 14+ messages in thread
From: David Howells @ 2017-11-24 14:39 UTC (permalink / raw)
To: netdev; +Cc: dhowells, linux-afs, linux-kernel
Fix the rxrpc connection expiry timers so that connections for closed
AF_RXRPC sockets get deleted in a more timely fashion, freeing up the
transport UDP port much more quickly.
(1) Replace the delayed work items with work items plus timers so that
timer_reduce() can be used to shorten them and so that the timer
doesn't requeue the work item if the net namespace is dead.
(2) Don't use queue_delayed_work() as that won't alter the timeout if the
timer is already running.
(3) Don't rearm the timers if the network namespace is dead.
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/af_rxrpc.c | 2 ++
net/rxrpc/ar-internal.h | 6 ++++--
net/rxrpc/conn_client.c | 30 +++++++++++++++++++-----------
net/rxrpc/conn_object.c | 28 +++++++++++++++++-----------
net/rxrpc/net_ns.c | 30 ++++++++++++++++++++++++++----
5 files changed, 68 insertions(+), 28 deletions(-)
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index abb524c2b8f8..8f7cf4c042be 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -895,6 +895,8 @@ static int rxrpc_release_sock(struct sock *sk)
rxrpc_release_calls_on_socket(rx);
flush_workqueue(rxrpc_workqueue);
rxrpc_purge_queue(&sk->sk_receive_queue);
+ rxrpc_queue_work(&rx->local->rxnet->service_conn_reaper);
+ rxrpc_queue_work(&rx->local->rxnet->client_conn_reaper);
rxrpc_put_local(rx->local);
rx->local = NULL;
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index a0082c407005..416688381eb7 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -79,7 +79,8 @@ struct rxrpc_net {
struct list_head conn_proc_list; /* List of conns in this namespace for proc */
struct list_head service_conns; /* Service conns in this namespace */
rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */
- struct delayed_work service_conn_reaper;
+ struct work_struct service_conn_reaper;
+ struct timer_list service_conn_reap_timer;
unsigned int nr_client_conns;
unsigned int nr_active_client_conns;
@@ -90,7 +91,8 @@ struct rxrpc_net {
struct list_head waiting_client_conns;
struct list_head active_client_conns;
struct list_head idle_client_conns;
- struct delayed_work client_conn_reaper;
+ struct work_struct client_conn_reaper;
+ struct timer_list client_conn_reap_timer;
struct list_head local_endpoints;
struct mutex local_mutex; /* Lock for ->local_endpoints */
diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c
index 785dfdb9fef1..7f74ca3059f8 100644
--- a/net/rxrpc/conn_client.c
+++ b/net/rxrpc/conn_client.c
@@ -691,7 +691,7 @@ int rxrpc_connect_call(struct rxrpc_call *call,
_enter("{%d,%lx},", call->debug_id, call->user_call_ID);
- rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper.work);
+ rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper);
rxrpc_cull_active_client_conns(rxnet);
ret = rxrpc_get_client_conn(call, cp, srx, gfp);
@@ -757,6 +757,18 @@ void rxrpc_expose_client_call(struct rxrpc_call *call)
}
/*
+ * Set the reap timer.
+ */
+static void rxrpc_set_client_reap_timer(struct rxrpc_net *rxnet)
+{
+ unsigned long now = jiffies;
+ unsigned long reap_at = now + rxrpc_conn_idle_client_expiry;
+
+ if (rxnet->live)
+ timer_reduce(&rxnet->client_conn_reap_timer, reap_at);
+}
+
+/*
* Disconnect a client call.
*/
void rxrpc_disconnect_client_call(struct rxrpc_call *call)
@@ -896,9 +908,7 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call)
list_move_tail(&conn->cache_link, &rxnet->idle_client_conns);
if (rxnet->idle_client_conns.next == &conn->cache_link &&
!rxnet->kill_all_client_conns)
- queue_delayed_work(rxrpc_workqueue,
- &rxnet->client_conn_reaper,
- rxrpc_conn_idle_client_expiry);
+ rxrpc_set_client_reap_timer(rxnet);
} else {
trace_rxrpc_client(conn, channel, rxrpc_client_to_inactive);
conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE;
@@ -1036,8 +1046,7 @@ void rxrpc_discard_expired_client_conns(struct work_struct *work)
{
struct rxrpc_connection *conn;
struct rxrpc_net *rxnet =
- container_of(to_delayed_work(work),
- struct rxrpc_net, client_conn_reaper);
+ container_of(work, struct rxrpc_net, client_conn_reaper);
unsigned long expiry, conn_expires_at, now;
unsigned int nr_conns;
bool did_discard = false;
@@ -1116,9 +1125,8 @@ void rxrpc_discard_expired_client_conns(struct work_struct *work)
*/
_debug("not yet");
if (!rxnet->kill_all_client_conns)
- queue_delayed_work(rxrpc_workqueue,
- &rxnet->client_conn_reaper,
- conn_expires_at - now);
+ timer_reduce(&rxnet->client_conn_reap_timer,
+ conn_expires_at);
out:
spin_unlock(&rxnet->client_conn_cache_lock);
@@ -1138,9 +1146,9 @@ void rxrpc_destroy_all_client_connections(struct rxrpc_net *rxnet)
rxnet->kill_all_client_conns = true;
spin_unlock(&rxnet->client_conn_cache_lock);
- cancel_delayed_work(&rxnet->client_conn_reaper);
+ del_timer_sync(&rxnet->client_conn_reap_timer);
- if (!queue_delayed_work(rxrpc_workqueue, &rxnet->client_conn_reaper, 0))
+ if (!rxrpc_queue_work(&rxnet->client_conn_reaper))
_debug("destroy: queue failed");
_leave("");
diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index 726eda6140ae..1aad04a32d5e 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -311,21 +311,29 @@ rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
}
/*
+ * Set the service connection reap timer.
+ */
+static void rxrpc_set_service_reap_timer(struct rxrpc_net *rxnet,
+ unsigned long reap_at)
+{
+ if (rxnet->live)
+ timer_reduce(&rxnet->service_conn_reap_timer, reap_at);
+}
+
+/*
* Release a service connection
*/
void rxrpc_put_service_conn(struct rxrpc_connection *conn)
{
- struct rxrpc_net *rxnet;
const void *here = __builtin_return_address(0);
int n;
n = atomic_dec_return(&conn->usage);
trace_rxrpc_conn(conn, rxrpc_conn_put_service, n, here);
ASSERTCMP(n, >=, 0);
- if (n == 1) {
- rxnet = conn->params.local->rxnet;
- rxrpc_queue_delayed_work(&rxnet->service_conn_reaper, 0);
- }
+ if (n == 1)
+ rxrpc_set_service_reap_timer(conn->params.local->rxnet,
+ jiffies + rxrpc_connection_expiry);
}
/*
@@ -362,8 +370,7 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
{
struct rxrpc_connection *conn, *_p;
struct rxrpc_net *rxnet =
- container_of(to_delayed_work(work),
- struct rxrpc_net, service_conn_reaper);
+ container_of(work, struct rxrpc_net, service_conn_reaper);
unsigned long expire_at, earliest, idle_timestamp, now;
LIST_HEAD(graveyard);
@@ -417,8 +424,7 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
if (earliest != now + MAX_JIFFY_OFFSET) {
_debug("reschedule reaper %ld", (long)earliest - (long)now);
ASSERT(time_after(earliest, now));
- rxrpc_queue_delayed_work(&rxnet->service_conn_reaper,
- earliest - now);
+ rxrpc_set_service_reap_timer(rxnet, earliest);
}
while (!list_empty(&graveyard)) {
@@ -446,8 +452,8 @@ void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet)
rxrpc_destroy_all_client_connections(rxnet);
- cancel_delayed_work(&rxnet->client_conn_reaper);
- rxrpc_queue_delayed_work(&rxnet->client_conn_reaper, 0);
+ del_timer_sync(&rxnet->service_conn_reap_timer);
+ rxrpc_queue_work(&rxnet->service_conn_reaper);
flush_workqueue(rxrpc_workqueue);
write_lock(&rxnet->conn_lock);
diff --git a/net/rxrpc/net_ns.c b/net/rxrpc/net_ns.c
index 684c51d600c7..f18c9248e0d4 100644
--- a/net/rxrpc/net_ns.c
+++ b/net/rxrpc/net_ns.c
@@ -14,6 +14,24 @@
unsigned int rxrpc_net_id;
+static void rxrpc_client_conn_reap_timeout(struct timer_list *timer)
+{
+ struct rxrpc_net *rxnet =
+ container_of(timer, struct rxrpc_net, client_conn_reap_timer);
+
+ if (rxnet->live)
+ rxrpc_queue_work(&rxnet->client_conn_reaper);
+}
+
+static void rxrpc_service_conn_reap_timeout(struct timer_list *timer)
+{
+ struct rxrpc_net *rxnet =
+ container_of(timer, struct rxrpc_net, service_conn_reap_timer);
+
+ if (rxnet->live)
+ rxrpc_queue_work(&rxnet->service_conn_reaper);
+}
+
/*
* Initialise a per-network namespace record.
*/
@@ -32,8 +50,10 @@ static __net_init int rxrpc_init_net(struct net *net)
INIT_LIST_HEAD(&rxnet->conn_proc_list);
INIT_LIST_HEAD(&rxnet->service_conns);
rwlock_init(&rxnet->conn_lock);
- INIT_DELAYED_WORK(&rxnet->service_conn_reaper,
- rxrpc_service_connection_reaper);
+ INIT_WORK(&rxnet->service_conn_reaper,
+ rxrpc_service_connection_reaper);
+ timer_setup(&rxnet->service_conn_reap_timer,
+ rxrpc_service_conn_reap_timeout, 0);
rxnet->nr_client_conns = 0;
rxnet->nr_active_client_conns = 0;
@@ -43,8 +63,10 @@ static __net_init int rxrpc_init_net(struct net *net)
INIT_LIST_HEAD(&rxnet->waiting_client_conns);
INIT_LIST_HEAD(&rxnet->active_client_conns);
INIT_LIST_HEAD(&rxnet->idle_client_conns);
- INIT_DELAYED_WORK(&rxnet->client_conn_reaper,
- rxrpc_discard_expired_client_conns);
+ INIT_WORK(&rxnet->client_conn_reaper,
+ rxrpc_discard_expired_client_conns);
+ timer_setup(&rxnet->client_conn_reap_timer,
+ rxrpc_client_conn_reap_timeout, 0);
INIT_LIST_HEAD(&rxnet->local_endpoints);
mutex_init(&rxnet->local_mutex);
^ permalink raw reply related [flat|nested] 14+ messages in thread* Re: [PATCH net-next 00/12] rxrpc: Fixes and improvements
2017-11-24 14:37 [PATCH net-next 00/12] rxrpc: Fixes and improvements David Howells
` (11 preceding siblings ...)
2017-11-24 14:39 ` [PATCH net-next 12/12] rxrpc: Fix conn expiry timers David Howells
@ 2017-11-24 20:05 ` David Miller
12 siblings, 0 replies; 14+ messages in thread
From: David Miller @ 2017-11-24 20:05 UTC (permalink / raw)
To: dhowells; +Cc: netdev, linux-afs, linux-kernel
From: David Howells <dhowells@redhat.com>
Date: Fri, 24 Nov 2017 14:37:39 +0000
> Is it too late for this to go to Linus in this merge window?
These look predominantly like fixes so I'll pull this in.
Thanks.
^ permalink raw reply [flat|nested] 14+ messages in thread