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Message-ID: <20240824022054.3788149-17-chopps@chopps.org>
Date: Fri, 23 Aug 2024 22:20:54 -0400
From: Christian Hopps <chopps@...pps.org>
To: devel@...ux-ipsec.org
Cc: Steffen Klassert <steffen.klassert@...unet.com>,
netdev@...r.kernel.org,
Florian Westphal <fw@...len.de>,
Sabrina Dubroca <sd@...asysnail.net>,
Simon Horman <horms@...nel.org>,
Antony Antony <antony@...nome.org>,
Christian Hopps <chopps@...pps.org>,
Christian Hopps <chopps@...n.net>
Subject: [PATCH ipsec-next v10 16/16] xfrm: iptfs: add tracepoint functionality
From: Christian Hopps <chopps@...n.net>
Add tracepoints to the IP-TFS code.
Signed-off-by: Christian Hopps <chopps@...n.net>
---
net/xfrm/trace_iptfs.h | 218 +++++++++++++++++++++++++++++++++++++++++
net/xfrm/xfrm_iptfs.c | 70 ++++++++++++-
2 files changed, 287 insertions(+), 1 deletion(-)
create mode 100644 net/xfrm/trace_iptfs.h
diff --git a/net/xfrm/trace_iptfs.h b/net/xfrm/trace_iptfs.h
new file mode 100644
index 000000000000..74391ba24445
--- /dev/null
+++ b/net/xfrm/trace_iptfs.h
@@ -0,0 +1,218 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* xfrm_trace_iptfs.h
+ *
+ * August 12 2023, Christian Hopps <chopps@...n.net>
+ *
+ * Copyright (c) 2023, LabN Consulting, L.L.C.
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM iptfs
+
+#if !defined(_TRACE_IPTFS_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_IPTFS_H
+
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/tracepoint.h>
+#include <net/ip.h>
+
+struct xfrm_iptfs_data;
+
+TRACE_EVENT(iptfs_egress_recv,
+ TP_PROTO(struct sk_buff *skb, struct xfrm_iptfs_data *xtfs, u16 blkoff),
+ TP_ARGS(skb, xtfs, blkoff),
+ TP_STRUCT__entry(__field(struct sk_buff *, skb)
+ __field(void *, head)
+ __field(void *, head_pg_addr)
+ __field(void *, pg0addr)
+ __field(u32, skb_len)
+ __field(u32, data_len)
+ __field(u32, headroom)
+ __field(u32, tailroom)
+ __field(u32, tail)
+ __field(u32, end)
+ __field(u32, pg0off)
+ __field(u8, head_frag)
+ __field(u8, frag_list)
+ __field(u8, nr_frags)
+ __field(u16, blkoff)),
+ TP_fast_assign(__entry->skb = skb;
+ __entry->head = skb->head;
+ __entry->skb_len = skb->len;
+ __entry->data_len = skb->data_len;
+ __entry->headroom = skb_headroom(skb);
+ __entry->tailroom = skb_tailroom(skb);
+ __entry->tail = (u32)skb->tail;
+ __entry->end = (u32)skb->end;
+ __entry->head_frag = skb->head_frag;
+ __entry->frag_list = (bool)skb_shinfo(skb)->frag_list;
+ __entry->nr_frags = skb_shinfo(skb)->nr_frags;
+ __entry->blkoff = blkoff;
+ __entry->head_pg_addr = page_address(virt_to_head_page(skb->head));
+ __entry->pg0addr = (__entry->nr_frags
+ ? page_address(netmem_to_page(skb_shinfo(skb)->frags[0].netmem))
+ : NULL);
+ __entry->pg0off = (__entry->nr_frags
+ ? skb_shinfo(skb)->frags[0].offset
+ : 0);
+ ),
+ TP_printk("EGRESS: skb=%p len=%u data_len=%u headroom=%u head_frag=%u frag_list=%u nr_frags=%u blkoff=%u\n\t\ttailroom=%u tail=%u end=%u head=%p hdpgaddr=%p pg0->addr=%p pg0->data=%p pg0->off=%u",
+ __entry->skb, __entry->skb_len, __entry->data_len, __entry->headroom,
+ __entry->head_frag, __entry->frag_list, __entry->nr_frags, __entry->blkoff,
+ __entry->tailroom, __entry->tail, __entry->end, __entry->head,
+ __entry->head_pg_addr, __entry->pg0addr, __entry->pg0addr + __entry->pg0off,
+ __entry->pg0off)
+ )
+
+DECLARE_EVENT_CLASS(iptfs_ingress_preq_event,
+ TP_PROTO(struct sk_buff *skb, struct xfrm_iptfs_data *xtfs,
+ u32 pmtu, u8 was_gso),
+ TP_ARGS(skb, xtfs, pmtu, was_gso),
+ TP_STRUCT__entry(__field(struct sk_buff *, skb)
+ __field(u32, skb_len)
+ __field(u32, data_len)
+ __field(u32, pmtu)
+ __field(u32, queue_size)
+ __field(u32, proto_seq)
+ __field(u8, proto)
+ __field(u8, was_gso)
+ ),
+ TP_fast_assign(__entry->skb = skb;
+ __entry->skb_len = skb->len;
+ __entry->data_len = skb->data_len;
+ __entry->queue_size =
+ xtfs->cfg.max_queue_size - xtfs->queue_size;
+ __entry->proto = __trace_ip_proto(ip_hdr(skb));
+ __entry->proto_seq = __trace_ip_proto_seq(ip_hdr(skb));
+ __entry->pmtu = pmtu;
+ __entry->was_gso = was_gso;
+ ),
+ TP_printk("INGRPREQ: skb=%p len=%u data_len=%u qsize=%u proto=%u proto_seq=%u pmtu=%u was_gso=%u",
+ __entry->skb, __entry->skb_len, __entry->data_len,
+ __entry->queue_size, __entry->proto, __entry->proto_seq,
+ __entry->pmtu, __entry->was_gso));
+
+DEFINE_EVENT(iptfs_ingress_preq_event, iptfs_enqueue,
+ TP_PROTO(struct sk_buff *skb, struct xfrm_iptfs_data *xtfs, u32 pmtu, u8 was_gso),
+ TP_ARGS(skb, xtfs, pmtu, was_gso));
+
+DEFINE_EVENT(iptfs_ingress_preq_event, iptfs_no_queue_space,
+ TP_PROTO(struct sk_buff *skb, struct xfrm_iptfs_data *xtfs, u32 pmtu, u8 was_gso),
+ TP_ARGS(skb, xtfs, pmtu, was_gso));
+
+DEFINE_EVENT(iptfs_ingress_preq_event, iptfs_too_big,
+ TP_PROTO(struct sk_buff *skb, struct xfrm_iptfs_data *xtfs, u32 pmtu, u8 was_gso),
+ TP_ARGS(skb, xtfs, pmtu, was_gso));
+
+DECLARE_EVENT_CLASS(iptfs_ingress_postq_event,
+ TP_PROTO(struct sk_buff *skb, u32 mtu, u16 blkoff, struct iphdr *iph),
+ TP_ARGS(skb, mtu, blkoff, iph),
+ TP_STRUCT__entry(__field(struct sk_buff *, skb)
+ __field(u32, skb_len)
+ __field(u32, data_len)
+ __field(u32, mtu)
+ __field(u32, proto_seq)
+ __field(u16, blkoff)
+ __field(u8, proto)),
+ TP_fast_assign(__entry->skb = skb;
+ __entry->skb_len = skb->len;
+ __entry->data_len = skb->data_len;
+ __entry->mtu = mtu;
+ __entry->blkoff = blkoff;
+ __entry->proto = iph ? __trace_ip_proto(iph) : 0;
+ __entry->proto_seq = iph ? __trace_ip_proto_seq(iph) : 0;
+ ),
+ TP_printk("INGRPSTQ: skb=%p len=%u data_len=%u mtu=%u blkoff=%u proto=%u proto_seq=%u",
+ __entry->skb, __entry->skb_len, __entry->data_len, __entry->mtu,
+ __entry->blkoff, __entry->proto, __entry->proto_seq));
+
+DEFINE_EVENT(iptfs_ingress_postq_event, iptfs_first_dequeue,
+ TP_PROTO(struct sk_buff *skb, u32 mtu, u16 blkoff,
+ struct iphdr *iph),
+ TP_ARGS(skb, mtu, blkoff, iph));
+
+DEFINE_EVENT(iptfs_ingress_postq_event, iptfs_first_fragmenting,
+ TP_PROTO(struct sk_buff *skb, u32 mtu, u16 blkoff,
+ struct iphdr *iph),
+ TP_ARGS(skb, mtu, blkoff, iph));
+
+DEFINE_EVENT(iptfs_ingress_postq_event, iptfs_first_final_fragment,
+ TP_PROTO(struct sk_buff *skb, u32 mtu, u16 blkoff,
+ struct iphdr *iph),
+ TP_ARGS(skb, mtu, blkoff, iph));
+
+DEFINE_EVENT(iptfs_ingress_postq_event, iptfs_first_toobig,
+ TP_PROTO(struct sk_buff *skb, u32 mtu, u16 blkoff,
+ struct iphdr *iph),
+ TP_ARGS(skb, mtu, blkoff, iph));
+
+TRACE_EVENT(iptfs_ingress_nth_peek,
+ TP_PROTO(struct sk_buff *skb, u32 remaining),
+ TP_ARGS(skb, remaining),
+ TP_STRUCT__entry(__field(struct sk_buff *, skb)
+ __field(u32, skb_len)
+ __field(u32, remaining)),
+ TP_fast_assign(__entry->skb = skb;
+ __entry->skb_len = skb->len;
+ __entry->remaining = remaining;
+ ),
+ TP_printk("INGRPSTQ: NTHPEEK: skb=%p len=%u remaining=%u",
+ __entry->skb, __entry->skb_len, __entry->remaining));
+
+TRACE_EVENT(iptfs_ingress_nth_add, TP_PROTO(struct sk_buff *skb, u8 share_ok),
+ TP_ARGS(skb, share_ok),
+ TP_STRUCT__entry(__field(struct sk_buff *, skb)
+ __field(u32, skb_len)
+ __field(u32, data_len)
+ __field(u8, share_ok)
+ __field(u8, head_frag)
+ __field(u8, pp_recycle)
+ __field(u8, cloned)
+ __field(u8, shared)
+ __field(u8, nr_frags)
+ __field(u8, frag_list)
+ ),
+ TP_fast_assign(__entry->skb = skb;
+ __entry->skb_len = skb->len;
+ __entry->data_len = skb->data_len;
+ __entry->share_ok = share_ok;
+ __entry->head_frag = skb->head_frag;
+ __entry->pp_recycle = skb->pp_recycle;
+ __entry->cloned = skb_cloned(skb);
+ __entry->shared = skb_shared(skb);
+ __entry->nr_frags = skb_shinfo(skb)->nr_frags;
+ __entry->frag_list = (bool)skb_shinfo(skb)->frag_list;
+ ),
+ TP_printk("INGRPSTQ: NTHADD: skb=%p len=%u data_len=%u share_ok=%u head_frag=%u pp_recycle=%u cloned=%u shared=%u nr_frags=%u frag_list=%u",
+ __entry->skb, __entry->skb_len, __entry->data_len, __entry->share_ok,
+ __entry->head_frag, __entry->pp_recycle, __entry->cloned, __entry->shared,
+ __entry->nr_frags, __entry->frag_list));
+
+DECLARE_EVENT_CLASS(iptfs_timer_event,
+ TP_PROTO(struct xfrm_iptfs_data *xtfs, u64 time_val),
+ TP_ARGS(xtfs, time_val),
+ TP_STRUCT__entry(__field(u64, time_val)
+ __field(u64, set_time)),
+ TP_fast_assign(__entry->time_val = time_val;
+ __entry->set_time = xtfs->iptfs_settime;
+ ),
+ TP_printk("TIMER: set_time=%llu time_val=%llu",
+ __entry->set_time, __entry->time_val));
+
+DEFINE_EVENT(iptfs_timer_event, iptfs_timer_start,
+ TP_PROTO(struct xfrm_iptfs_data *xtfs, u64 time_val),
+ TP_ARGS(xtfs, time_val));
+
+DEFINE_EVENT(iptfs_timer_event, iptfs_timer_expire,
+ TP_PROTO(struct xfrm_iptfs_data *xtfs, u64 time_val),
+ TP_ARGS(xtfs, time_val));
+
+#endif /* _TRACE_IPTFS_H */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../net/xfrm
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace_iptfs
+#include <trace/define_trace.h>
diff --git a/net/xfrm/xfrm_iptfs.c b/net/xfrm/xfrm_iptfs.c
index dee27ebe29d2..7f7b3078ca70 100644
--- a/net/xfrm/xfrm_iptfs.c
+++ b/net/xfrm/xfrm_iptfs.c
@@ -19,6 +19,7 @@
#include <crypto/aead.h>
#include "xfrm_inout.h"
+#include "trace_iptfs.h"
/* IPTFS encap (header) values. */
#define IPTFS_SUBTYPE_BASIC 0
@@ -131,6 +132,7 @@ struct skb_wseq {
* @ecn_queue_size: octets above with ECN mark.
* @init_delay_ns: nanoseconds to wait to send initial IPTFS packet.
* @iptfs_timer: output timer.
+ * @iptfs_settime: time the output timer was set.
* @payload_mtu: max payload size.
* @w_seq_set: true after first seq received.
* @w_wantseq: waiting for this seq number as next to process (in order).
@@ -155,6 +157,7 @@ struct xfrm_iptfs_data {
u32 ecn_queue_size; /* octets above which ECN mark */
u64 init_delay_ns; /* nanoseconds */
struct hrtimer iptfs_timer; /* output timer */
+ time64_t iptfs_settime; /* time timer was set */
u32 payload_mtu; /* max payload size */
/* Tunnel input reordering */
@@ -181,6 +184,39 @@ static enum hrtimer_restart iptfs_drop_timer(struct hrtimer *me);
/* Utility Functions */
/* ================= */
+static u32 __trace_ip_proto(struct iphdr *iph)
+{
+ if (iph->version == 4)
+ return iph->protocol;
+ return ((struct ipv6hdr *)iph)->nexthdr;
+}
+
+static u32 __trace_ip_proto_seq(struct iphdr *iph)
+{
+ void *nexthdr;
+ u32 protocol = 0;
+
+ if (iph->version == 4) {
+ nexthdr = (void *)(iph + 1);
+ protocol = iph->protocol;
+ } else if (iph->version == 6) {
+ nexthdr = (void *)(((struct ipv6hdr *)(iph)) + 1);
+ protocol = ((struct ipv6hdr *)(iph))->nexthdr;
+ }
+ switch (protocol) {
+ case IPPROTO_ICMP:
+ return ntohs(((struct icmphdr *)nexthdr)->un.echo.sequence);
+ case IPPROTO_ICMPV6:
+ return ntohs(((struct icmp6hdr *)nexthdr)->icmp6_sequence);
+ case IPPROTO_TCP:
+ return ntohl(((struct tcphdr *)nexthdr)->seq);
+ case IPPROTO_UDP:
+ return ntohs(((struct udphdr *)nexthdr)->source);
+ default:
+ return 0;
+ }
+}
+
static u64 __esp_seq(struct sk_buff *skb)
{
u64 seq = ntohl(XFRM_SKB_CB(skb)->seq.input.low);
@@ -470,6 +506,13 @@ static int iptfs_skb_add_frags(struct sk_buff *skb,
return len;
}
+/* ================================== */
+/* IPTFS Trace Event Definitions */
+/* ================================== */
+
+#define CREATE_TRACE_POINTS
+#include "trace_iptfs.h"
+
/* ================================== */
/* IPTFS Receiving (egress) Functions */
/* ================================== */
@@ -965,6 +1008,8 @@ static void iptfs_input_ordered(struct xfrm_state *x, struct sk_buff *skb)
}
data = sizeof(*ipth);
+ trace_iptfs_egress_recv(skb, xtfs, be16_to_cpu(ipth->block_offset));
+
/* Set data past the basic header */
if (ipth->subtype == IPTFS_SUBTYPE_CC) {
/* Copy the rest of the CC header */
@@ -1863,6 +1908,7 @@ static int iptfs_output_collect(struct net *net, struct sock *sk,
*/
if (!ok) {
nospace:
+ trace_iptfs_no_queue_space(skb, xtfs, pmtu, was_gso);
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOQSPACE);
kfree_skb_reason(skb, SKB_DROP_REASON_FULL_RING);
continue;
@@ -1872,6 +1918,7 @@ static int iptfs_output_collect(struct net *net, struct sock *sk,
* enqueue.
*/
if (xtfs->cfg.dont_frag && iptfs_is_too_big(sk, skb, pmtu)) {
+ trace_iptfs_too_big(skb, xtfs, pmtu, was_gso);
kfree_skb_reason(skb, SKB_DROP_REASON_PKT_TOO_BIG);
continue;
}
@@ -1880,12 +1927,17 @@ static int iptfs_output_collect(struct net *net, struct sock *sk,
ok = iptfs_enqueue(xtfs, skb);
if (!ok)
goto nospace;
+
+ trace_iptfs_enqueue(skb, xtfs, pmtu, was_gso);
}
/* Start a delay timer if we don't have one yet */
- if (!hrtimer_is_queued(&xtfs->iptfs_timer))
+ if (!hrtimer_is_queued(&xtfs->iptfs_timer)) {
hrtimer_start(&xtfs->iptfs_timer, xtfs->init_delay_ns,
IPTFS_HRTIMER_MODE);
+ xtfs->iptfs_settime = ktime_get_raw_fast_ns();
+ trace_iptfs_timer_start(xtfs, xtfs->init_delay_ns);
+ }
spin_unlock_bh(&x->lock);
return 0;
@@ -1970,6 +2022,7 @@ static int iptfs_copy_create_frags(struct sk_buff **skbp,
struct sk_buff *nskb = *skbp;
u32 copy_len, offset;
u32 to_copy = skb->len - mtu;
+ u32 blkoff = 0;
int err = 0;
INIT_LIST_HEAD(&sublist);
@@ -1982,6 +2035,7 @@ static int iptfs_copy_create_frags(struct sk_buff **skbp,
to_copy = skb->len - offset;
while (to_copy) {
/* Send all but last fragment to allow agg. append */
+ trace_iptfs_first_fragmenting(nskb, mtu, to_copy, NULL);
list_add_tail(&nskb->list, &sublist);
/* FUTURE: if the packet has an odd/non-aligning length we could
@@ -2001,11 +2055,14 @@ static int iptfs_copy_create_frags(struct sk_buff **skbp,
iptfs_output_prepare_skb(nskb, to_copy);
offset += copy_len;
to_copy -= copy_len;
+ blkoff = to_copy;
}
skb_abort_seq_read(&skbseq);
/* return last fragment that will be unsent (or NULL) */
*skbp = nskb;
+ if (nskb)
+ trace_iptfs_first_final_fragment(nskb, mtu, blkoff, NULL);
/* trim the original skb to MTU */
if (!err)
@@ -2082,6 +2139,8 @@ static int iptfs_first_skb(struct sk_buff **skbp, struct xfrm_iptfs_data *xtfs,
/* We've split these up before queuing */
WARN_ON_ONCE(skb_is_gso(skb));
+ trace_iptfs_first_dequeue(skb, mtu, 0, ip_hdr(skb));
+
/* Simple case -- it fits. `mtu` accounted for all the overhead
* including the basic IPTFS header.
*/
@@ -2178,6 +2237,7 @@ static void iptfs_output_queued(struct xfrm_state *x, struct sk_buff_head *list)
*/
XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTERROR);
+ trace_iptfs_first_toobig(skb, mtu, 0, ip_hdr(skb));
kfree_skb_reason(skb, SKB_DROP_REASON_PKT_TOO_BIG);
continue;
}
@@ -2225,6 +2285,7 @@ static void iptfs_output_queued(struct xfrm_state *x, struct sk_buff_head *list)
* case.
*/
while ((skb2 = skb_peek(list))) {
+ trace_iptfs_ingress_nth_peek(skb2, remaining);
if (skb2->len > remaining)
break;
@@ -2260,6 +2321,8 @@ static void iptfs_output_queued(struct xfrm_state *x, struct sk_buff_head *list)
skb->len += skb2->len;
remaining -= skb2->len;
+ trace_iptfs_ingress_nth_add(skb2, share_ok);
+
if (share_ok) {
iptfs_consume_frags(skb, skb2);
} else {
@@ -2283,6 +2346,7 @@ static enum hrtimer_restart iptfs_delay_timer(struct hrtimer *me)
struct sk_buff_head list;
struct xfrm_iptfs_data *xtfs;
struct xfrm_state *x;
+ time64_t settime;
xtfs = container_of(me, typeof(*xtfs), iptfs_timer);
x = xtfs->x;
@@ -2299,6 +2363,7 @@ static enum hrtimer_restart iptfs_delay_timer(struct hrtimer *me)
__skb_queue_head_init(&list);
skb_queue_splice_init(&xtfs->queue, &list);
xtfs->queue_size = 0;
+ settime = xtfs->iptfs_settime;
spin_unlock(&x->lock);
/* After the above unlock, packets can begin queuing again, and the
@@ -2307,6 +2372,9 @@ static enum hrtimer_restart iptfs_delay_timer(struct hrtimer *me)
* already).
*/
+ trace_iptfs_timer_expire(
+ xtfs, (unsigned long long)(ktime_get_raw_fast_ns() - settime));
+
iptfs_output_queued(x, &list);
return HRTIMER_NORESTART;
--
2.46.0
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