netdev - [PATCH net-next v2] net: Print hashed skb addresses for all net and qdisc events

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Date:   Fri, 24 Jun 2022 15:34:25 -0600
From:   Subash Abhinov Kasiviswanathan <quic_subashab@...cinc.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <quic_jzenner@...cinc.com>, <cong.wang@...edance.com>,
        <qitao.xu@...edance.com>, <bigeasy@...utronix.de>,
        <rostedt@...dmis.org>, <mingo@...hat.com>
CC:     Subash Abhinov Kasiviswanathan <quic_subashab@...cinc.com>,
        "Sean Tranchetti" <quic_stranche@...cinc.com>
Subject: [PATCH net-next v2] net: Print hashed skb addresses for all net and qdisc events

The following commits added support for printing the real address-
65875073eddd ("net: use %px to print skb address in trace_netif_receive_skb")
70713dddf3d2 ("net_sched: introduce tracepoint trace_qdisc_enqueue()")
851f36e40962 ("net_sched: use %px to print skb address in trace_qdisc_dequeue()")

However, tracing the packet traversal shows a mix of hashes and real
addresses. Pasting a sample trace for reference-

ping-14249   [002] .....  3424.046612: netif_rx_entry: dev=lo napi_id=0x3 queue_mapping=0
skbaddr=00000000dcbed83e vlan_tagged=0 vlan_proto=0x0000 vlan_tci=0x0000 protocol=0x0800
ip_summed=0 hash=0x00000000 l4_hash=0 len=84 data_len=0 truesize=768 mac_header_valid=1
mac_header=-14 nr_frags=0 gso_size=0 gso_type=0x0
ping-14249   [002] .....  3424.046615: netif_rx: dev=lo skbaddr=ffffff888e5d1000 len=84

Switch the trace print formats to %p for all the events to have a
consistent format of printing the hashed addresses in all cases.

Signed-off-by: Sean Tranchetti <quic_stranche@...cinc.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <quic_subashab@...cinc.com>
---
v1->v2: Switch to printing hashed addresses in all cases as mentioned by Eric.

 include/trace/events/net.h   | 2 +-
 include/trace/events/qdisc.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/trace/events/net.h b/include/trace/events/net.h
index 032b431..da611a7 100644
--- a/include/trace/events/net.h
+++ b/include/trace/events/net.h
@@ -136,7 +136,7 @@ DECLARE_EVENT_CLASS(net_dev_template,
 		__assign_str(name, skb->dev->name);
 	),
 
-	TP_printk("dev=%s skbaddr=%px len=%u",
+	TP_printk("dev=%s skbaddr=%p len=%u",
 		__get_str(name), __entry->skbaddr, __entry->len)
 )
 
diff --git a/include/trace/events/qdisc.h b/include/trace/events/qdisc.h
index 59c945b..a399592 100644
--- a/include/trace/events/qdisc.h
+++ b/include/trace/events/qdisc.h
@@ -41,7 +41,7 @@ TRACE_EVENT(qdisc_dequeue,
 		__entry->txq_state	= txq->state;
 	),
 
-	TP_printk("dequeue ifindex=%d qdisc handle=0x%X parent=0x%X txq_state=0x%lX packets=%d skbaddr=%px",
+	TP_printk("dequeue ifindex=%d qdisc handle=0x%X parent=0x%X txq_state=0x%lX packets=%d skbaddr=%p",
 		  __entry->ifindex, __entry->handle, __entry->parent,
 		  __entry->txq_state, __entry->packets, __entry->skbaddr )
 );
@@ -70,7 +70,7 @@ TRACE_EVENT(qdisc_enqueue,
 		__entry->parent	 = qdisc->parent;
 	),
 
-	TP_printk("enqueue ifindex=%d qdisc handle=0x%X parent=0x%X skbaddr=%px",
+	TP_printk("enqueue ifindex=%d qdisc handle=0x%X parent=0x%X skbaddr=%p",
 		  __entry->ifindex, __entry->handle, __entry->parent, __entry->skbaddr)
 );
 
-- 
2.7.4