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Expose some netdump configuration parameters through sysctl.

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Reviewed by:	cem
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D17755
This commit is contained in:
Mark Johnston 2018-10-29 21:16:26 +00:00
parent 2fa224b17d
commit da7d7778b0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=339883
2 changed files with 26 additions and 13 deletions
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15
share/man/man4/netdump.4
View file

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd June 8, 2018
.Dd October 29, 2018
.Dt NETDUMP 4
.Os
.Sh NAME
@ -130,6 +130,19 @@ a path of
will cause the server to attempt to store dumps from the client in
.Pa /var/crash/foo .
The server will not automatically create the relative directory.
.It Va net.netdump.polls
The client will poll the configured network interface while waiting for
acknowledgements.
This parameter controls the maximum number of poll attempts before giving
up, which typically results in a re-transmit.
Each poll attempt takes 0.5ms.
.It Va net.netdump.retries
The number of times the client will re-transmit a packet before aborting
a dump due to a lack of acknowledgement.
The default may be too small in environments with lots of packet loss.
.It Va net.netdump.arp_retries
The number of times the client will attempt to learn the MAC address of
the configured gateway or server before giving up and aborting the dump.
.El
.Sh SEE ALSO
.Xr decryptcore 8 ,

24
sys/netinet/netdump/netdump_client.c
View file

@ -117,18 +117,6 @@ static int restore_gw_addr;
static uint64_t rcvd_acks;
CTASSERT(sizeof(rcvd_acks) * NBBY == NETDUMP_MAX_IN_FLIGHT);
/*
* Times to poll the NIC (0.5ms each poll) before assuming packetloss
* occurred (default to 1s).
*/
static int nd_polls = 2000;
/* Times to retransmit lost packets. */
static int nd_retries = 10;
/* Number of ARP retries. */
static int nd_arp_retries = 3;
/* Configuration parameters. */
static struct netdump_conf nd_conf;
#define nd_server nd_conf.ndc_server
@ -157,6 +145,18 @@ static char nd_path[MAXPATHLEN];
SYSCTL_STRING(_net_netdump, OID_AUTO, path, CTLFLAG_RW,
nd_path, sizeof(nd_path),
"Server path for output files");
static int nd_polls = 2000;
SYSCTL_INT(_net_netdump, OID_AUTO, polls, CTLFLAG_RWTUN,
&nd_polls, 0,
"Number of times to poll before assuming packet loss (0.5ms per poll)");
static int nd_retries = 10;
SYSCTL_INT(_net_netdump, OID_AUTO, retries, CTLFLAG_RWTUN,
&nd_retries, 0,
"Number of retransmit attempts before giving up");
static int nd_arp_retries = 3;
SYSCTL_INT(_net_netdump, OID_AUTO, arp_retries, CTLFLAG_RWTUN,
&nd_arp_retries, 0,
"Number of ARP attempts before giving up");
/*
* Checks for netdump support on a network interface