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Message-ID: <147464381419.5090.14059613688273483196.stgit@warthog.procyon.org.uk>
Date: Fri, 23 Sep 2016 16:16:54 +0100
From: David Howells <dhowells@...hat.com>
To: netdev@...r.kernel.org
Cc: dhowells@...hat.com, linux-afs@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH net-next 14/15] rxrpc: Add tracepoint for ACK proposal
Add a tracepoint to log proposed ACKs, including whether the proposal is
used to update a pending ACK or is discarded in favour of an easlier,
higher priority ACK.
Whilst we're at it, get rid of the rxrpc_acks() function and access the
name array directly. We do, however, need to validate the ACK reason
number given to trace_rxrpc_rx_ack() to make sure we don't overrun the
array.
Signed-off-by: David Howells <dhowells@...hat.com>
---
include/rxrpc/packet.h | 1 +
include/trace/events/rxrpc.h | 42 ++++++++++++++++++++++++++++++++++++++++--
net/rxrpc/ar-internal.h | 25 +++++++++++++++++++++++--
net/rxrpc/call_event.c | 21 ++++++++++++++-------
net/rxrpc/input.c | 19 +++++++++++++------
net/rxrpc/misc.c | 30 +++++++++++++++++++-----------
net/rxrpc/output.c | 3 ++-
net/rxrpc/recvmsg.c | 3 ++-
8 files changed, 114 insertions(+), 30 deletions(-)
diff --git a/include/rxrpc/packet.h b/include/rxrpc/packet.h
index fd6eb3a60a8c..703a64b4681a 100644
--- a/include/rxrpc/packet.h
+++ b/include/rxrpc/packet.h
@@ -123,6 +123,7 @@ struct rxrpc_ackpacket {
#define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */
#define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */
#define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */
+#define RXRPC_ACK__INVALID 10 /* Representation of invalid ACK reason */
uint8_t nAcks; /* number of ACKs */
#define RXRPC_MAXACKS 255
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 9413b17ba04b..d67a8c6b085a 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -251,7 +251,7 @@ TRACE_EVENT(rxrpc_rx_ack,
TP_printk("c=%p %s f=%08x n=%u",
__entry->call,
- rxrpc_acks(__entry->reason),
+ rxrpc_ack_names[__entry->reason],
__entry->first,
__entry->n_acks)
);
@@ -314,7 +314,7 @@ TRACE_EVENT(rxrpc_tx_ack,
TP_printk(" c=%p ACK %08x %s f=%08x r=%08x n=%u",
__entry->call,
__entry->serial,
- rxrpc_acks(__entry->reason),
+ rxrpc_ack_names[__entry->reason],
__entry->ack_first,
__entry->ack_serial,
__entry->n_acks)
@@ -505,6 +505,44 @@ TRACE_EVENT(rxrpc_rx_lose,
__entry->hdr.type <= 15 ? rxrpc_pkts[__entry->hdr.type] : "?UNK")
);
+TRACE_EVENT(rxrpc_propose_ack,
+ TP_PROTO(struct rxrpc_call *call, enum rxrpc_propose_ack_trace why,
+ u8 ack_reason, rxrpc_serial_t serial, bool immediate,
+ bool background, enum rxrpc_propose_ack_outcome outcome),
+
+ TP_ARGS(call, why, ack_reason, serial, immediate, background,
+ outcome),
+
+ TP_STRUCT__entry(
+ __field(struct rxrpc_call *, call )
+ __field(enum rxrpc_propose_ack_trace, why )
+ __field(rxrpc_serial_t, serial )
+ __field(u8, ack_reason )
+ __field(bool, immediate )
+ __field(bool, background )
+ __field(enum rxrpc_propose_ack_outcome, outcome )
+ ),
+
+ TP_fast_assign(
+ __entry->call = call;
+ __entry->why = why;
+ __entry->serial = serial;
+ __entry->ack_reason = ack_reason;
+ __entry->immediate = immediate;
+ __entry->background = background;
+ __entry->outcome = outcome;
+ ),
+
+ TP_printk("c=%p %s %s r=%08x i=%u b=%u%s",
+ __entry->call,
+ rxrpc_propose_ack_traces[__entry->why],
+ rxrpc_ack_names[__entry->ack_reason],
+ __entry->serial,
+ __entry->immediate,
+ __entry->background,
+ rxrpc_propose_ack_outcomes[__entry->outcome])
+ );
+
#endif /* _TRACE_RXRPC_H */
/* This part must be outside protection */
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index e564eca75985..042dbcc52654 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -689,8 +689,28 @@ enum rxrpc_timer_trace {
extern const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8];
+enum rxrpc_propose_ack_trace {
+ rxrpc_propose_ack_input_data,
+ rxrpc_propose_ack_ping_for_params,
+ rxrpc_propose_ack_respond_to_ack,
+ rxrpc_propose_ack_respond_to_ping,
+ rxrpc_propose_ack_retry_tx,
+ rxrpc_propose_ack_terminal_ack,
+ rxrpc_propose_ack__nr_trace
+};
+
+enum rxrpc_propose_ack_outcome {
+ rxrpc_propose_ack_use,
+ rxrpc_propose_ack_update,
+ rxrpc_propose_ack_subsume,
+ rxrpc_propose_ack__nr_outcomes
+};
+
+extern const char rxrpc_propose_ack_traces[rxrpc_propose_ack__nr_trace][8];
+extern const char *const rxrpc_propose_ack_outcomes[rxrpc_propose_ack__nr_outcomes];
+
extern const char *const rxrpc_pkts[];
-extern const char *rxrpc_acks(u8 reason);
+extern const char const rxrpc_ack_names[RXRPC_ACK__INVALID + 1][4];
#include <trace/events/rxrpc.h>
@@ -719,7 +739,8 @@ int rxrpc_reject_call(struct rxrpc_sock *);
* call_event.c
*/
void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace);
-void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool);
+void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
+ enum rxrpc_propose_ack_trace);
void rxrpc_process_call(struct work_struct *);
/*
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index 90e970ba048a..fd5b11339ffb 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -58,14 +58,13 @@ out:
*/
static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
u16 skew, u32 serial, bool immediate,
- bool background)
+ bool background,
+ 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;
s8 prior = rxrpc_ack_priority[ack_reason];
- _enter("{%d},%s,%%%x,%u",
- call->debug_id, rxrpc_acks(ack_reason), serial, immediate);
-
/* Update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial
* numbers, but we don't alter the timeout.
*/
@@ -74,15 +73,18 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
call->ackr_reason, rxrpc_ack_priority[call->ackr_reason]);
if (ack_reason == call->ackr_reason) {
if (RXRPC_ACK_UPDATEABLE & (1 << ack_reason)) {
+ outcome = rxrpc_propose_ack_update;
call->ackr_serial = serial;
call->ackr_skew = skew;
}
if (!immediate)
- return;
+ goto trace;
} else if (prior > rxrpc_ack_priority[call->ackr_reason]) {
call->ackr_reason = ack_reason;
call->ackr_serial = serial;
call->ackr_skew = skew;
+ } else {
+ outcome = rxrpc_propose_ack_subsume;
}
switch (ack_reason) {
@@ -124,17 +126,22 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
rxrpc_set_timer(call, rxrpc_timer_set_for_ack);
}
}
+
+trace:
+ trace_rxrpc_propose_ack(call, why, ack_reason, serial, immediate,
+ background, outcome);
}
/*
* propose an ACK be sent, locking the call structure
*/
void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
- u16 skew, u32 serial, bool immediate, bool background)
+ u16 skew, u32 serial, bool immediate, bool background,
+ enum rxrpc_propose_ack_trace why)
{
spin_lock_bh(&call->lock);
__rxrpc_propose_ACK(call, ack_reason, skew, serial,
- immediate, background);
+ immediate, background, why);
spin_unlock_bh(&call->lock);
}
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 19b1e189f5dc..349698d87ad1 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -49,7 +49,8 @@ static void rxrpc_send_ping(struct rxrpc_call *call, struct sk_buff *skb,
if (call->peer->rtt_usage < 3 ||
ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now))
rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial,
- true, true);
+ true, true,
+ rxrpc_propose_ack_ping_for_params);
}
/*
@@ -382,7 +383,8 @@ skip:
ack:
if (ack)
rxrpc_propose_ACK(call, ack, skew, ack_serial,
- immediate_ack, true);
+ immediate_ack, true,
+ rxrpc_propose_ack_input_data);
if (sp->hdr.seq == READ_ONCE(call->rx_hard_ack) + 1)
rxrpc_notify_socket(call);
@@ -539,6 +541,7 @@ static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks,
static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb,
u16 skew)
{
+ u8 ack_reason;
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
union {
struct rxrpc_ackpacket ack;
@@ -561,8 +564,10 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb,
first_soft_ack = ntohl(buf.ack.firstPacket);
hard_ack = first_soft_ack - 1;
nr_acks = buf.ack.nAcks;
+ ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ?
+ buf.ack.reason : RXRPC_ACK__INVALID);
- trace_rxrpc_rx_ack(call, first_soft_ack, buf.ack.reason, nr_acks);
+ trace_rxrpc_rx_ack(call, first_soft_ack, ack_reason, nr_acks);
_proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
sp->hdr.serial,
@@ -570,7 +575,7 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb,
first_soft_ack,
ntohl(buf.ack.previousPacket),
acked_serial,
- rxrpc_acks(buf.ack.reason),
+ rxrpc_ack_names[ack_reason],
buf.ack.nAcks);
if (buf.ack.reason == RXRPC_ACK_PING_RESPONSE)
@@ -583,10 +588,12 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb,
if (buf.ack.reason == RXRPC_ACK_PING) {
_proto("Rx ACK %%%u PING Request", sp->hdr.serial);
rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE,
- skew, sp->hdr.serial, true, true);
+ skew, sp->hdr.serial, true, true,
+ rxrpc_propose_ack_respond_to_ping);
} else if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED,
- skew, sp->hdr.serial, true, true);
+ skew, sp->hdr.serial, true, true,
+ rxrpc_propose_ack_respond_to_ack);
}
offset = sp->offset + nr_acks + 3;
diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c
index fa9942fabdf2..1ca14835d87f 100644
--- a/net/rxrpc/misc.c
+++ b/net/rxrpc/misc.c
@@ -91,17 +91,10 @@ const s8 rxrpc_ack_priority[] = {
[RXRPC_ACK_PING] = 9,
};
-const char *rxrpc_acks(u8 reason)
-{
- static const char *const str[] = {
- "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY",
- "IDL", "-?-"
- };
-
- if (reason >= ARRAY_SIZE(str))
- reason = ARRAY_SIZE(str) - 1;
- return str[reason];
-}
+const char const rxrpc_ack_names[RXRPC_ACK__INVALID + 1][4] = {
+ "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY",
+ "IDL", "-?-"
+};
const char rxrpc_skb_traces[rxrpc_skb__nr_trace][7] = {
[rxrpc_skb_rx_cleaned] = "Rx CLN",
@@ -202,3 +195,18 @@ const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8] = {
[rxrpc_timer_set_for_send] = "SetTx ",
[rxrpc_timer_set_for_resend] = "SetRTx",
};
+
+const char rxrpc_propose_ack_traces[rxrpc_propose_ack__nr_trace][8] = {
+ [rxrpc_propose_ack_input_data] = "DataIn ",
+ [rxrpc_propose_ack_ping_for_params] = "Params ",
+ [rxrpc_propose_ack_respond_to_ack] = "Rsp2Ack",
+ [rxrpc_propose_ack_respond_to_ping] = "Rsp2Png",
+ [rxrpc_propose_ack_retry_tx] = "RetryTx",
+ [rxrpc_propose_ack_terminal_ack] = "ClTerm ",
+};
+
+const char *const rxrpc_propose_ack_outcomes[rxrpc_propose_ack__nr_outcomes] = {
+ [rxrpc_propose_ack_use] = "",
+ [rxrpc_propose_ack_update] = " Update",
+ [rxrpc_propose_ack_subsume] = " Subsume",
+};
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index e47fbd1c836d..0c563e325c9d 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -210,7 +210,8 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type)
rxrpc_propose_ACK(call, pkt->ack.reason,
ntohs(pkt->ack.maxSkew),
ntohl(pkt->ack.serial),
- true, true);
+ true, true,
+ rxrpc_propose_ack_retry_tx);
break;
case RXRPC_PACKET_TYPE_ABORT:
break;
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 99e4c0ae30f1..8c7f3de45bac 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -141,7 +141,8 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call)
ASSERTCMP(call->rx_hard_ack, ==, call->rx_top);
if (call->state == RXRPC_CALL_CLIENT_RECV_REPLY) {
- rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, 0, 0, true, false);
+ rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, 0, 0, true, false,
+ rxrpc_propose_ack_terminal_ack);
rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK);
}
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