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Add iscsi_set_tcp_syncnt function

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This patch adds support for setting TCP_SYNCNT to overwrite
the system default values. This allows indirect support
for a configurable connect timeout.

Linux uses a exponential backoff for SYN retries starting
with 1 second.

This means for a value n for TCP_SYNCNT, the connect will
effectively timeout after 2^(n+1)-1 seconds.
This commit is contained in:
Peter Lieven
2012-10-20 18:43:48 +02:00
parent d1110b7515
commit 78a31ad4a1
6 changed files with 52 additions and 4 deletions
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10
lib/init.c
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@@ -74,6 +74,10 @@ iscsi_create_context(const char *initiator_name)
iscsi->tcp_keepcnt=3;
iscsi->tcp_keepintvl=30;
iscsi->tcp_keepidle=30;
if (getenv("LIBISCSI_DEBUG") != NULL) {
iscsi_set_debug(iscsi,atoi(getenv("LIBISCSI_DEBUG")));
}
if (getenv("LIBISCSI_TCP_USER_TIMEOUT") != NULL) {
iscsi_set_tcp_user_timeout(iscsi,atoi(getenv("LIBISCSI_TCP_USER_TIMEOUT")));
@@ -90,9 +94,9 @@ iscsi_create_context(const char *initiator_name)
if (getenv("LIBISCSI_TCP_KEEPIDLE") != NULL) {
iscsi_set_tcp_keepidle(iscsi,atoi(getenv("LIBISCSI_TCP_KEEPIDLE")));
}
if (getenv("LIBISCSI_DEBUG") != NULL) {
iscsi_set_debug(iscsi,atoi(getenv("LIBISCSI_DEBUG")));
if (getenv("LIBISCSI_TCP_SYNCNT") != NULL) {
iscsi_set_tcp_syncnt(iscsi,atoi(getenv("LIBISCSI_TCP_SYNCNT")));
}
return iscsi;