drbd: New configuration parameters for dealing with network congestion
net {
on_congestion {block|pull-ahead|disconnect};
congestion-fill {sectors};
congestion-extents {al-extents};
}
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index ef44c7a..03a08ba 100644
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -96,6 +96,12 @@
OND_SUSPEND_IO
};
+enum drbd_on_congestion {
+ OC_BLOCK,
+ OC_PULL_AHEAD,
+ OC_DISCONNECT,
+};
+
/* KEEP the order, do not delete or insert. Only append. */
enum drbd_ret_codes {
ERR_CODE_BASE = 100,
@@ -146,6 +152,7 @@
ERR_PERM = 152,
ERR_NEED_APV_93 = 153,
ERR_STONITH_AND_PROT_A = 154,
+ ERR_CONG_NOT_PROTO_A = 155,
/* insert new ones above this line */
AFTER_LAST_ERR_CODE
diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index 4ac33f3..abf4187 100644
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -129,6 +129,7 @@
#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
#define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
+#define DRBD_ON_CONGESTION_DEF OC_BLOCK
#define DRBD_MAX_BIO_BVECS_MIN 0
#define DRBD_MAX_BIO_BVECS_MAX 128
@@ -154,5 +155,13 @@
#define DRBD_C_MIN_RATE_MAX (4 << 20)
#define DRBD_C_MIN_RATE_DEF 4096
+#define DRBD_CONG_FILL_MIN 0
+#define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */
+#define DRBD_CONG_FILL_DEF 0
+
+#define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN
+#define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX
+#define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF
+
#undef RANGE
#endif
diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h
index ade9110..8cde394 100644
--- a/include/linux/drbd_nl.h
+++ b/include/linux/drbd_nl.h
@@ -56,6 +56,9 @@
NL_INTEGER( 39, T_MAY_IGNORE, rr_conflict)
NL_INTEGER( 40, T_MAY_IGNORE, ping_timeo)
NL_INTEGER( 67, T_MAY_IGNORE, rcvbuf_size)
+ NL_INTEGER( 81, T_MAY_IGNORE, on_congestion)
+ NL_INTEGER( 82, T_MAY_IGNORE, cong_fill)
+ NL_INTEGER( 83, T_MAY_IGNORE, cong_extents)
/* 59 addr_family was available in GIT, never released */
NL_BIT( 60, T_MANDATORY, mind_af)
NL_BIT( 27, T_MAY_IGNORE, want_lose)