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dtrace: improve siftr probe

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Improve consistency of the field names with tcpsinfo_t:
* Use mss instead of max_seg_size.
* Use lport and rport instead of tcp_localport and tcp_foreignport.

Use t_flags instead of flags to improve consistency with t_flags2.

Add laddr and raddr, since the addresses were missing when compared
to the output of siftr.

Reviewed by:		cc
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D40834
This commit is contained in:
Michael Tuexen 2023-07-02 03:08:51 +02:00
parent ccc806a049
commit 2176c9ab71
3 changed files with 50 additions and 32 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
cddl/lib/libdtrace/siftr.d
View file

@ -21,6 +21,7 @@
* $FreeBSD$
*/
#pragma D depends_on library ip.d
#pragma D depends_on module kernel
#pragma D depends_on module siftr
#pragma D depends_on provider tcp
@ -44,20 +45,22 @@ typedef struct siftrinfo {
struct timeval tval;
uint8_t direction;
uint8_t ipver;
uint16_t tcp_localport;
uint16_t tcp_foreignport;
uint16_t lport;
uint16_t rport;
string laddr;
string raddr;
uint32_t snd_cwnd;
uint32_t snd_wnd;
uint32_t rcv_wnd;
uint32_t t_flags2;
uint32_t snd_ssthresh;
int conn_state;
u_int max_seg_size;
uint32_t mss;
uint32_t srtt;
u_char sack_enabled;
u_char snd_scale;
u_char rcv_scale;
u_int flags;
u_int t_flags;
uint32_t rto;
u_int snd_buf_hiwater;
u_int snd_buf_cc;
@ -73,20 +76,28 @@ typedef struct siftrinfo {
translator siftrinfo_t < struct pkt_node *p > {
direction = p == NULL ? 0 : p->direction;
ipver = p == NULL ? 0 : p->ipver;
tcp_localport = p == NULL ? 0 : ntohs(p->tcp_localport);
tcp_foreignport = p == NULL ? 0 : ntohs(p->tcp_foreignport);
lport = p == NULL ? 0 : ntohs(p->lport);
rport = p == NULL ? 0 : ntohs(p->fport);
laddr = p == NULL ? "<unknown>" :
p->ipver == INP_IPV4 ?
inet_ntoa(&p->laddr.id46_addr.ia46_addr4.s_addr) :
inet_ntoa6(&p->laddr.id6_addr);
raddr = p == NULL ? "<unknown>" :
p->ipver == INP_IPV4 ?
inet_ntoa(&p->faddr.id46_addr.ia46_addr4.s_addr) :
inet_ntoa6(&p->faddr.id6_addr);
snd_cwnd = p == NULL ? 0 : p->snd_cwnd;
snd_wnd = p == NULL ? 0 : p->snd_wnd;
rcv_wnd = p == NULL ? 0 : p->rcv_wnd;
t_flags2 = p == NULL ? 0 : p->t_flags2;
snd_ssthresh = p == NULL ? 0 : p->snd_ssthresh;
conn_state = p == NULL ? 0 : p->conn_state;
max_seg_size = p == NULL ? 0 : p->max_seg_size;
mss = p == NULL ? 0 : p->mss;
srtt = p == NULL ? 0 : p->srtt;
sack_enabled = p == NULL ? 0 : p->sack_enabled;
snd_scale = p == NULL ? 0 : p->snd_scale;
rcv_scale = p == NULL ? 0 : p->rcv_scale;
flags = p == NULL ? 0 : p->flags;
t_flags = p == NULL ? 0 : p->t_flags;
rto = p == NULL ? 0 : p->rto;
snd_buf_hiwater = p == NULL ? 0 : p->snd_buf_hiwater;
snd_buf_cc = p == NULL ? 0 : p->snd_buf_cc;

26
share/man/man4/dtrace_tcp.4
View file

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd July 1, 2023
.Dd July 2, 2023
.Dt DTRACE_TCP 4
.Os
.Sh NAME
@ -319,10 +319,14 @@ Either
for IPv4, or
.Qq 2
for IPv6.
.It Vt uint16_t tcp_localport
.It Vt uint16_t lport
The TCP port that the local host is communicating via.
.It Vt uint16_t tcp_foreignport
The TCP port that the foreign host is communicating via.
.It Vt uint16_t rport
The TCP port that the remote host is communicating via.
.It Vt string laddr
The IPv4 or IPv6 address of the local host.
.It Vt string raddr
The IPv4 or IPv6 address of the remote host.
.It Vt uint32_t snd_cwnd
The current congestion window (CWND) for the flow, in bytes.
.It Vt uint32_t snd_wnd
@ -342,8 +346,8 @@ The valid TCP state values are given by the constants prefixed with
.Ql TCPS_
in
.Pa /usr/lib/dtrace/tcp.d .
.It Vt u_int max_seg_size
The maximum segment size for the flow, in bytes.
.It Vt uint32_t mss
The maximum segment size (MSS) for the flow, in bytes.
.It Vt uint32_t srtt
The current smoothed RTT (SRTT) for the flow in microseconds.
.It Vt u_char sack_enabled
@ -352,7 +356,7 @@ SACK enabled indicator. 1 if SACK enabled, 0 otherwise.
The current window scaling factor for the sending window.
.It Vt u_char rcv_scale
The current window scaling factor for the receiving window.
.It Vt u_int flags
.It Vt u_int t_flags
The current value of the t_flags for the flow.
.It Vt uint32_t rto
The current retransmission timeout (RTO) for the flow in microseconds.
@ -480,15 +484,15 @@ and SSTHRESH when a packet is sent or received:
dtrace:::BEGIN
{
printf(" %3s %5s %5s %10s %10s\\n",
"DIR", "LPORT", "RPORT", "CWND", "SSTHRESH");
printf(" %3s %16s:%-5s %16s:%-5s %10s %10s\\n",
"DIR", "LADDR", "LPORT", "RADDR", "RPORT", "CWND", "SSTHRESH");
}
tcp:::siftr
{
printf(" %3s %5d %5d %10d %10d\\n",
printf(" %3s %16s:%-5d %16s:%-5d %10u %10u\\n",
siftr_dir_string[args[0]->direction],
args[0]->tcp_localport, args[0]->tcp_foreignport,
args[0]->laddr, args[0]->lport, args[0]->raddr, args[0]->rport,
args[0]->snd_cwnd, args[0]->snd_ssthresh);
}
.Ed

29
sys/netinet/siftr.c
View file

@ -163,9 +163,13 @@ struct pkt_node {
/* IP version pkt_node relates to; either INP_IPV4 or INP_IPV6. */
uint8_t ipver;
/* Local TCP port. */
uint16_t tcp_localport;
uint16_t lport;
/* Foreign TCP port. */
uint16_t tcp_foreignport;
uint16_t fport;
/* Local address. */
union in_dependaddr laddr;
/* Foreign address. */
union in_dependaddr faddr;
/* Congestion Window (bytes). */
uint32_t snd_cwnd;
/* Sending Window (bytes). */
@ -179,7 +183,7 @@ struct pkt_node {
/* Current state of the TCP FSM. */
int conn_state;
/* Max Segment Size (bytes). */
u_int max_seg_size;
uint32_t mss;
/* Smoothed RTT (usecs). */
uint32_t srtt;
/* Is SACK enabled? */
@ -189,7 +193,7 @@ struct pkt_node {
/* Window scaling for recv window. */
u_char rcv_scale;
/* TCP control block flags. */
u_int flags;
u_int t_flags;
/* Retransmission timeout (usec). */
uint32_t rto;
/* Size of the TCP send buffer in bytes. */
@ -223,7 +227,6 @@ struct flow_info
#endif
uint16_t lport; /* local TCP port */
uint16_t fport; /* foreign TCP port */
uint8_t ipver; /* IP version */
uint32_t key; /* flowid of the connection */
};
@ -427,10 +430,10 @@ siftr_process_pkt(struct pkt_node * pkt_node)
pkt_node->snd_scale,
pkt_node->rcv_scale,
pkt_node->conn_state,
pkt_node->max_seg_size,
pkt_node->mss,
pkt_node->srtt,
pkt_node->sack_enabled,
pkt_node->flags,
pkt_node->t_flags,
pkt_node->rto,
pkt_node->snd_buf_hiwater,
pkt_node->snd_buf_cc,
@ -642,8 +645,10 @@ siftr_siftdata(struct pkt_node *pn, struct inpcb *inp, struct tcpcb *tp,
int ipver, int dir, int inp_locally_locked)
{
pn->ipver = ipver;
pn->tcp_localport = inp->inp_lport;
pn->tcp_foreignport = inp->inp_fport;
pn->lport = inp->inp_lport;
pn->fport = inp->inp_fport;
pn->laddr = inp->inp_inc.inc_ie.ie_dependladdr;
pn->faddr = inp->inp_inc.inc_ie.ie_dependfaddr;
pn->snd_cwnd = tp->snd_cwnd;
pn->snd_wnd = tp->snd_wnd;
pn->rcv_wnd = tp->rcv_wnd;
@ -652,10 +657,10 @@ siftr_siftdata(struct pkt_node *pn, struct inpcb *inp, struct tcpcb *tp,
pn->snd_scale = tp->snd_scale;
pn->rcv_scale = tp->rcv_scale;
pn->conn_state = tp->t_state;
pn->max_seg_size = tp->t_maxseg;
pn->mss = tp->t_maxseg;
pn->srtt = ((uint64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
pn->sack_enabled = (tp->t_flags & TF_SACK_PERMIT) != 0;
pn->flags = tp->t_flags;
pn->t_flags = tp->t_flags;
pn->rto = tp->t_rxtcur * tick;
pn->snd_buf_hiwater = inp->inp_socket->so_snd.sb_hiwat;
pn->snd_buf_cc = sbused(&inp->inp_socket->so_snd);
@ -796,7 +801,6 @@ siftr_chkpkt(struct mbuf **m, struct ifnet *ifp, int flags,
info.lport = ntohs(inp->inp_lport);
info.fport = ntohs(inp->inp_fport);
info.key = hash_id;
info.ipver = INP_IPV4;
hash_node = siftr_new_hash_node(info, dir, ss);
}
@ -946,7 +950,6 @@ siftr_chkpkt6(struct mbuf **m, struct ifnet *ifp, int flags,
info.lport = ntohs(inp->inp_lport);
info.fport = ntohs(inp->inp_fport);
info.key = hash_id;
info.ipver = INP_IPV6;
hash_node = siftr_new_hash_node(info, dir, ss);
}