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tcp: Shouldn't drain empty sbuf

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MFC after: 2 weeks
Reviewed By: tuexen, #transport
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D29524
This commit is contained in:
Richard Scheffenegger 2021-04-01 17:18:04 +02:00
parent cb5f8694a5
commit 9aef4e7c2b
1 changed files with 10 additions and 2 deletions
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10
sys/netinet/tcp_hostcache.c
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@ -644,6 +644,7 @@ sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS)
const int linesize = 128;
struct sbuf sb;
int i, error, len;
bool do_drain = false;
struct hc_metrics *hc_entry;
char ip4buf[INET_ADDRSTRLEN];
#ifdef INET6
@ -701,9 +702,16 @@ sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS)
hc_entry->rmx_hits,
hc_entry->rmx_updates,
hc_entry->rmx_expire);
do_drain = true;
}
THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
/* Need to track if sbuf has data, to avoid
* a KASSERT when calling sbuf_drain.
*/
if (do_drain) {
sbuf_drain(&sb);
do_drain = false;
}
}
#undef msec
error = sbuf_finish(&sb);
@ -769,7 +777,7 @@ tcp_hc_purge_internal(int all)
KASSERT(V_tcp_hostcache.hashbase[i].hch_length > 0 &&
V_tcp_hostcache.hashbase[i].hch_length <=
V_tcp_hostcache.bucket_limit,
("tcp_hostcache: bucket langth out of range at %u: %u",
("tcp_hostcache: bucket length out of range at %u: %u",
i, V_tcp_hostcache.hashbase[i].hch_length));
if (all || hc_entry->rmx_expire <= 0) {
TAILQ_REMOVE(&V_tcp_hostcache.hashbase[i].hch_bucket,