drbd: Receiving of delay_probes
Delay_probes are new packets in the DRBD protocol, which allow
DRBD to know the current delay packets have on the data socket.
(relative to the meta data socket)
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 2409de1..fd7615f 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -209,8 +209,11 @@
P_RS_IS_IN_SYNC = 0x22, /* meta socket */
P_SYNC_PARAM89 = 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */
P_COMPRESSED_BITMAP = 0x24, /* compressed or otherwise encoded bitmap transfer */
+ /* P_CKPT_FENCE_REQ = 0x25, * currently reserved for protocol D */
+ /* P_CKPT_DISABLE_REQ = 0x26, * currently reserved for protocol D */
+ P_DELAY_PROBE = 0x27, /* is used on BOTH sockets */
- P_MAX_CMD = 0x25,
+ P_MAX_CMD = 0x28,
P_MAY_IGNORE = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */
P_MAX_OPT_CMD = 0x101,
@@ -540,6 +543,18 @@
u8 code[0];
} __packed;
+struct p_delay_probe {
+ struct p_header head;
+ u32 seq_num; /* sequence number to match the two probe packets */
+ u32 offset; /* usecs the probe got sent after the reference time point */
+} __packed;
+
+struct delay_probe {
+ struct list_head list;
+ int seq_num;
+ struct timeval time;
+};
+
/* DCBP: Drbd Compressed Bitmap Packet ... */
static inline enum drbd_bitmap_code
DCBP_get_code(struct p_compressed_bm *p)
@@ -1028,6 +1043,9 @@
u64 ed_uuid; /* UUID of the exposed data */
struct mutex state_mutex;
char congestion_reason; /* Why we where congested... */
+ struct list_head delay_probes; /* protected by peer_seq_lock */
+ int data_delay; /* Delay of packets on the data-sock behind meta-sock */
+ atomic_t delay_seq; /* To generate sequence numbers of delay probes */
};
static inline struct drbd_conf *minor_to_mdev(unsigned int minor)