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authorJeremy Kerr <jk@codeconstruct.com.au>2021-09-29 10:26:10 +0300
committerDavid S. Miller <davem@davemloft.net>2021-09-29 13:00:11 +0300
commit4f9e1ba6de45aa8797a83f1fe5b82ec4bac16899 (patch)
tree5af27668529ef6500809810eef7c4d2c374c68d3 /net/mctp/route.c
parent7b14e15ae6f4850392800482efb54d5cf4ae300c (diff)
downloadlinux-4f9e1ba6de45aa8797a83f1fe5b82ec4bac16899.tar.xz
mctp: Add tracepoints for tag/key handling
The tag allocation, release and bind events are somewhat opaque outside the kernel; this change adds a few tracepoints to assist in instrumentation and debugging. Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mctp/route.c')
-rw-r--r--net/mctp/route.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/net/mctp/route.c b/net/mctp/route.c
index c342adf4f97f..acc5bb39e16d 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -23,10 +23,11 @@
#include <net/netlink.h>
#include <net/sock.h>
+#include <trace/events/mctp.h>
+
static const unsigned int mctp_message_maxlen = 64 * 1024;
static const unsigned long mctp_key_lifetime = 6 * CONFIG_HZ;
-
/* route output callbacks */
static int mctp_route_discard(struct mctp_route *route, struct sk_buff *skb)
{
@@ -332,6 +333,8 @@ static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
/* we've hit a pending reassembly; not much we
* can do but drop it
*/
+ trace_mctp_key_release(key,
+ MCTP_TRACE_KEY_REPLIED);
__mctp_key_unlock_drop(key, net, f);
key = NULL;
}
@@ -365,12 +368,16 @@ static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
if (rc)
kfree(key);
+ trace_mctp_key_acquire(key);
+
/* we don't need to release key->lock on exit */
key = NULL;
} else {
if (key->reasm_head || key->reasm_dead) {
/* duplicate start? drop everything */
+ trace_mctp_key_release(key,
+ MCTP_TRACE_KEY_INVALIDATED);
__mctp_key_unlock_drop(key, net, f);
rc = -EEXIST;
key = NULL;
@@ -396,6 +403,7 @@ static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
if (!rc && flags & MCTP_HDR_FLAG_EOM) {
sock_queue_rcv_skb(key->sk, key->reasm_head);
key->reasm_head = NULL;
+ trace_mctp_key_release(key, MCTP_TRACE_KEY_REPLIED);
__mctp_key_unlock_drop(key, net, f);
key = NULL;
}
@@ -572,6 +580,8 @@ static int mctp_alloc_local_tag(struct mctp_sock *msk,
if (tagbits) {
key->tag = __ffs(tagbits);
mctp_reserve_tag(net, key, msk);
+ trace_mctp_key_acquire(key);
+
*tagp = key->tag;
rc = 0;
}