[net-next,09/17] rxrpc: Implement a mechanism to send an event notification to a call

Message ID	166919853874.1258552.7742669866983317595.stgit@warthog.procyon.org.uk (mailing list archive)
State	RFC
Delegated to:	Netdev Maintainers
Headers	show Return-Path: <netdev-owner@kernel.org> Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH net-next 09/17] rxrpc: Implement a mechanism to send an event notification to a call From: David Howells <dhowells@redhat.com> To: netdev@vger.kernel.org Cc: Marc Dionne <marc.dionne@auristor.com>, linux-afs@lists.infradead.org, dhowells@redhat.com, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org Date: Wed, 23 Nov 2022 10:15:38 +0000 Message-ID: <166919853874.1258552.7742669866983317595.stgit@warthog.procyon.org.uk> In-Reply-To: <166919846440.1258552.9618708344491052554.stgit@warthog.procyon.org.uk> References: <166919846440.1258552.9618708344491052554.stgit@warthog.procyon.org.uk> User-Agent: StGit/1.5 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk
Series	rxrpc: Increasing SACK size and moving away from softirq, part 3 \| expand [net-next,00/17] rxrpc: Increasing SACK size and moving away from softirq, part 3 [net-next,01/17] rxrpc: Split the receive code [net-next,02/17] rxrpc: Create a per-local endpoint receive queue and I/O thread [net-next,03/17] rxrpc: Move packet reception processing into I/O thread [net-next,04/17] rxrpc: Move error processing into the local endpoint I/O thread [net-next,05/17] rxrpc: Remove call->input_lock [net-next,06/17] rxrpc: Don't use sk->sk_receive_queue.lock to guard socket state changes [net-next,07/17] rxrpc: Don't take spinlocks in the RCU callback functions [net-next,08/17] rxrpc: Remove the _bh annotation from all the spinlocks [net-next,09/17] rxrpc: Implement a mechanism to send an event notification to a call [net-next,10/17] rxrpc: Move DATA transmission into call processor work item [net-next,11/17] rxrpc: Remove RCU from peer->error_targets list [net-next,12/17] rxrpc: Make the I/O thread take over the call and local processor work [net-next,13/17] rxrpc: Trace/count transmission underflows and cwnd resets [net-next,14/17] rxrpc: Move the cwnd degradation after transmitting packets [net-next,15/17] rxrpc: Fold __rxrpc_unuse_local() into rxrpc_unuse_local() [net-next,16/17] rxrpc: Transmit ACKs at the point of generation [net-next,17/17] rxrpc: Simplify skbuff accounting in receive path

Context	Check	Description
netdev/tree_selection	success	Clearly marked for net-next
netdev/apply	fail	Patch does not apply to net-next

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h index b54af1920d0d..4cab522da17b 100644 --- a/include/trace/events/rxrpc.h +++ b/include/trace/events/rxrpc.h @@ -16,6 +16,13 @@ /* * Declare tracing information enums and their string mappings for display. */ +#define rxrpc_call_poke_traces \ + EM(rxrpc_call_poke_error, "Error") \ + EM(rxrpc_call_poke_idle, "Idle") \ + EM(rxrpc_call_poke_start, "Start") \ + EM(rxrpc_call_poke_timer, "Timer") \ + E_(rxrpc_call_poke_timer_now, "Timer-now") + #define rxrpc_skb_traces \ EM(rxrpc_skb_eaten_by_unshare, "ETN unshare ") \ EM(rxrpc_skb_eaten_by_unshare_nomem, "ETN unshar-nm") \ @@ -151,6 +158,7 @@ EM(rxrpc_call_get_input, "GET input ") \ EM(rxrpc_call_get_kernel_service, "GET krnl-srv") \ EM(rxrpc_call_get_notify_socket, "GET notify ") \ + EM(rxrpc_call_get_poke, "GET poke ") \ EM(rxrpc_call_get_recvmsg, "GET recvmsg ") \ EM(rxrpc_call_get_release_sock, "GET rel-sock") \ EM(rxrpc_call_get_retrans, "GET retrans ") \ @@ -164,6 +172,7 @@ EM(rxrpc_call_put_discard_prealloc, "PUT disc-pre") \ EM(rxrpc_call_put_input, "PUT input ") \ EM(rxrpc_call_put_kernel, "PUT kernel ") \ + EM(rxrpc_call_put_poke, "PUT poke ") \ EM(rxrpc_call_put_recvmsg, "PUT recvmsg ") \ EM(rxrpc_call_put_release_sock, "PUT rls-sock") \ EM(rxrpc_call_put_release_sock_tba, "PUT rls-sk-a") \ @@ -384,6 +393,7 @@ #define E_(a, b) a enum rxrpc_bundle_trace { rxrpc_bundle_traces } __mode(byte); +enum rxrpc_call_poke_trace { rxrpc_call_poke_traces } __mode(byte); enum rxrpc_call_trace { rxrpc_call_traces } __mode(byte); enum rxrpc_client_trace { rxrpc_client_traces } __mode(byte); enum rxrpc_congest_change { rxrpc_congest_changes } __mode(byte); @@ -414,6 +424,7 @@ enum rxrpc_txqueue_trace { rxrpc_txqueue_traces } __mode(byte); #define E_(a, b) TRACE_DEFINE_ENUM(a); rxrpc_bundle_traces; +rxrpc_call_poke_traces; rxrpc_call_traces; rxrpc_client_traces; rxrpc_congest_changes; @@ -1753,6 +1764,47 @@ TRACE_EVENT(rxrpc_txbuf, __entry->ref) ); +TRACE_EVENT(rxrpc_poke_call, + TP_PROTO(struct rxrpc_call *call, bool busy, + enum rxrpc_call_poke_trace what), + + TP_ARGS(call, busy, what), + + TP_STRUCT__entry( + __field(unsigned int, call_debug_id ) + __field(bool, busy ) + __field(enum rxrpc_call_poke_trace, what ) + ), + + TP_fast_assign( + __entry->call_debug_id = call->debug_id; + __entry->busy = busy; + __entry->what = what; + ), + + TP_printk("c=%08x %s%s", + __entry->call_debug_id, + __print_symbolic(__entry->what, rxrpc_call_poke_traces), + __entry->busy ? "!" : "") + ); + +TRACE_EVENT(rxrpc_call_poked, + TP_PROTO(struct rxrpc_call *call), + + TP_ARGS(call), + + TP_STRUCT__entry( + __field(unsigned int, call_debug_id ) + ), + + TP_fast_assign( + __entry->call_debug_id = call->debug_id; + ), + + TP_printk("c=%08x", + __entry->call_debug_id) + ); + #undef EM #undef E_ #endif /* _TRACE_RXRPC_H */ diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h index 641fc9e1dc27..8bf8651a69b5 100644 --- a/net/rxrpc/ar-internal.h +++ b/net/rxrpc/ar-internal.h @@ -292,6 +292,7 @@ struct rxrpc_local { struct sk_buff_head reject_queue; /* packets awaiting rejection */ struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */ struct sk_buff_head rx_queue; /* Received packets */ + struct list_head call_attend_q; /* Calls requiring immediate attention */ struct rb_root client_bundles; /* Client connection bundles by socket params */ spinlock_t client_bundles_lock; /* Lock for client_bundles */ spinlock_t lock; /* access lock */ @@ -612,6 +613,7 @@ struct rxrpc_call { struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ struct list_head sock_link; /* Link in rx->sock_calls */ struct rb_node sock_node; /* Node in rx->calls */ + struct list_head attend_link; /* Link in local->call_attend_q */ struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ wait_queue_head_t waitq; /* Wait queue for channel or Tx */ s64 tx_total_len; /* Total length left to be transmitted (or -1) */ @@ -841,6 +843,7 @@ extern const char *const rxrpc_call_states[]; extern const char *const rxrpc_call_completions[]; extern struct kmem_cache *rxrpc_call_jar; +void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, @@ -962,7 +965,7 @@ void rxrpc_unpublish_service_conn(struct rxrpc_connection *); /* * input.c */ -void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); +void rxrpc_input_call_event(struct rxrpc_call *, struct sk_buff *); void rxrpc_input_implicit_end_call(struct rxrpc_sock *, struct rxrpc_connection *, struct rxrpc_call *); diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c index 8abb6a785697..aa44e7a9a3f8 100644 --- a/net/rxrpc/call_object.c +++ b/net/rxrpc/call_object.c @@ -45,6 +45,29 @@ static struct semaphore rxrpc_call_limiter = static struct semaphore rxrpc_kernel_call_limiter = __SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000); +void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what) +{ + struct rxrpc_local *local; + struct rxrpc_peer *peer = call->peer; + bool busy; + + if (WARN_ON_ONCE(!peer)) + return; + local = peer->local; + + if (call->state < RXRPC_CALL_COMPLETE) { + spin_lock_bh(&local->lock); + busy = !list_empty(&call->attend_link); + trace_rxrpc_poke_call(call, busy, what); + if (!busy) { + rxrpc_get_call(call, rxrpc_call_get_poke); + list_add_tail(&call->attend_link, &local->call_attend_q); + } + spin_unlock_bh(&local->lock); + rxrpc_wake_up_io_thread(local); + } +} + static void rxrpc_call_timer_expired(struct timer_list *t) { struct rxrpc_call *call = from_timer(call, t, timer); @@ -145,6 +168,7 @@ struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, INIT_LIST_HEAD(&call->accept_link); INIT_LIST_HEAD(&call->recvmsg_link); INIT_LIST_HEAD(&call->sock_link); + INIT_LIST_HEAD(&call->attend_link); INIT_LIST_HEAD(&call->tx_buffer); skb_queue_head_init(&call->recvmsg_queue); skb_queue_head_init(&call->rx_oos_queue); @@ -645,7 +669,6 @@ void rxrpc_cleanup_call(struct rxrpc_call *call) } rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); rxrpc_free_skb(call->acks_soft_tbl, rxrpc_skb_put_ack); - rxrpc_delete_call_timer(call); rxrpc_put_connection(call->conn, rxrpc_conn_put_call); rxrpc_put_peer(call->peer, rxrpc_peer_put_call); diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c index 1b9da9078315..6b3f21d081cf 100644 --- a/net/rxrpc/input.c +++ b/net/rxrpc/input.c @@ -1017,8 +1017,7 @@ static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb) /* * Process an incoming call packet. */ -void rxrpc_input_call_packet(struct rxrpc_call *call, - struct sk_buff *skb) +void rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb) { struct rxrpc_skb_priv *sp = rxrpc_skb(skb); unsigned long timo; diff --git a/net/rxrpc/io_thread.c b/net/rxrpc/io_thread.c index 416c6101cf78..cc249bc6b8cd 100644 --- a/net/rxrpc/io_thread.c +++ b/net/rxrpc/io_thread.c @@ -366,7 +366,7 @@ static int rxrpc_input_packet(struct rxrpc_local *local, struct sk_buff *skb) /* Process a call packet; this either discards or passes on the ref * elsewhere. */ - rxrpc_input_call_packet(call, skb); + rxrpc_input_call_event(call, skb); goto out; discard: @@ -413,6 +413,7 @@ int rxrpc_io_thread(void *data) { struct sk_buff_head rx_queue; struct rxrpc_local *local = data; + struct rxrpc_call *call; struct sk_buff *skb; skb_queue_head_init(&rx_queue); @@ -422,6 +423,20 @@ int rxrpc_io_thread(void *data) for (;;) { rxrpc_inc_stat(local->rxnet, stat_io_loop); + /* Deal with calls that want immediate attention. */ + if ((call = list_first_entry_or_null(&local->call_attend_q, + struct rxrpc_call, + attend_link))) { + spin_lock_bh(&local->lock); + list_del_init(&call->attend_link); + spin_unlock_bh(&local->lock); + + trace_rxrpc_call_poked(call); + rxrpc_input_call_event(call, NULL); + rxrpc_put_call(call, rxrpc_call_put_poke); + continue; + } + /* Process received packets and errors. */ if ((skb = __skb_dequeue(&rx_queue))) { switch (skb->mark) { @@ -450,7 +465,8 @@ int rxrpc_io_thread(void *data) } set_current_state(TASK_INTERRUPTIBLE); - if (!skb_queue_empty(&local->rx_queue)) { + if (!skb_queue_empty(&local->rx_queue) || + !list_empty(&local->call_attend_q)) { __set_current_state(TASK_RUNNING); continue; } diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c index 6b4d77219f36..03f491cc23ef 100644 --- a/net/rxrpc/local_object.c +++ b/net/rxrpc/local_object.c @@ -104,6 +104,7 @@ static struct rxrpc_local *rxrpc_alloc_local(struct rxrpc_net *rxnet, skb_queue_head_init(&local->reject_queue); skb_queue_head_init(&local->event_queue); skb_queue_head_init(&local->rx_queue); + INIT_LIST_HEAD(&local->call_attend_q); local->client_bundles = RB_ROOT; spin_lock_init(&local->client_bundles_lock); spin_lock_init(&local->lock);

[net-next,09/17] rxrpc: Implement a mechanism to send an event notification to a call

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