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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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668700b40a
The intention is to reduce CPU utilization. Recent measurements unveiled that the current performance bottleneck is CPU utilization on the receiving node. The asender thread became CPU limited. One of the main points is to eliminate the idr_for_each_entry() loop from the sending acks code path. One exception in that is sending back ping_acks. These stay in the ack-receiver thread. Otherwise the logic becomes too complicated for no added value. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
308 lines
8.3 KiB
C
308 lines
8.3 KiB
C
#ifndef __DRBD_PROTOCOL_H
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#define __DRBD_PROTOCOL_H
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enum drbd_packet {
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/* receiver (data socket) */
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P_DATA = 0x00,
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P_DATA_REPLY = 0x01, /* Response to P_DATA_REQUEST */
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P_RS_DATA_REPLY = 0x02, /* Response to P_RS_DATA_REQUEST */
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P_BARRIER = 0x03,
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P_BITMAP = 0x04,
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P_BECOME_SYNC_TARGET = 0x05,
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P_BECOME_SYNC_SOURCE = 0x06,
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P_UNPLUG_REMOTE = 0x07, /* Used at various times to hint the peer */
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P_DATA_REQUEST = 0x08, /* Used to ask for a data block */
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P_RS_DATA_REQUEST = 0x09, /* Used to ask for a data block for resync */
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P_SYNC_PARAM = 0x0a,
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P_PROTOCOL = 0x0b,
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P_UUIDS = 0x0c,
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P_SIZES = 0x0d,
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P_STATE = 0x0e,
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P_SYNC_UUID = 0x0f,
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P_AUTH_CHALLENGE = 0x10,
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P_AUTH_RESPONSE = 0x11,
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P_STATE_CHG_REQ = 0x12,
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/* (meta socket) */
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P_PING = 0x13,
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P_PING_ACK = 0x14,
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P_RECV_ACK = 0x15, /* Used in protocol B */
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P_WRITE_ACK = 0x16, /* Used in protocol C */
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P_RS_WRITE_ACK = 0x17, /* Is a P_WRITE_ACK, additionally call set_in_sync(). */
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P_SUPERSEDED = 0x18, /* Used in proto C, two-primaries conflict detection */
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P_NEG_ACK = 0x19, /* Sent if local disk is unusable */
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P_NEG_DREPLY = 0x1a, /* Local disk is broken... */
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P_NEG_RS_DREPLY = 0x1b, /* Local disk is broken... */
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P_BARRIER_ACK = 0x1c,
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P_STATE_CHG_REPLY = 0x1d,
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/* "new" commands, no longer fitting into the ordering scheme above */
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P_OV_REQUEST = 0x1e, /* data socket */
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P_OV_REPLY = 0x1f,
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P_OV_RESULT = 0x20, /* meta socket */
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P_CSUM_RS_REQUEST = 0x21, /* data socket */
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P_RS_IS_IN_SYNC = 0x22, /* meta socket */
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P_SYNC_PARAM89 = 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */
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P_COMPRESSED_BITMAP = 0x24, /* compressed or otherwise encoded bitmap transfer */
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/* P_CKPT_FENCE_REQ = 0x25, * currently reserved for protocol D */
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/* P_CKPT_DISABLE_REQ = 0x26, * currently reserved for protocol D */
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P_DELAY_PROBE = 0x27, /* is used on BOTH sockets */
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P_OUT_OF_SYNC = 0x28, /* Mark as out of sync (Outrunning), data socket */
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P_RS_CANCEL = 0x29, /* meta: Used to cancel RS_DATA_REQUEST packet by SyncSource */
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P_CONN_ST_CHG_REQ = 0x2a, /* data sock: Connection wide state request */
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P_CONN_ST_CHG_REPLY = 0x2b, /* meta sock: Connection side state req reply */
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P_RETRY_WRITE = 0x2c, /* Protocol C: retry conflicting write request */
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P_PROTOCOL_UPDATE = 0x2d, /* data sock: is used in established connections */
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/* 0x2e to 0x30 reserved, used in drbd 9 */
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/* REQ_DISCARD. We used "discard" in different contexts before,
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* which is why I chose TRIM here, to disambiguate. */
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P_TRIM = 0x31,
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P_MAY_IGNORE = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */
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P_MAX_OPT_CMD = 0x101,
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/* special command ids for handshake */
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P_INITIAL_META = 0xfff1, /* First Packet on the MetaSock */
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P_INITIAL_DATA = 0xfff2, /* First Packet on the Socket */
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P_CONNECTION_FEATURES = 0xfffe /* FIXED for the next century! */
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};
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#ifndef __packed
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#define __packed __attribute__((packed))
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#endif
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/* This is the layout for a packet on the wire.
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* The byteorder is the network byte order.
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* (except block_id and barrier fields.
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* these are pointers to local structs
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* and have no relevance for the partner,
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* which just echoes them as received.)
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*
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* NOTE that the payload starts at a long aligned offset,
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* regardless of 32 or 64 bit arch!
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*/
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struct p_header80 {
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u32 magic;
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u16 command;
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u16 length; /* bytes of data after this header */
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} __packed;
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/* Header for big packets, Used for data packets exceeding 64kB */
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struct p_header95 {
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u16 magic; /* use DRBD_MAGIC_BIG here */
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u16 command;
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u32 length;
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} __packed;
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struct p_header100 {
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u32 magic;
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u16 volume;
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u16 command;
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u32 length;
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u32 pad;
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} __packed;
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/* these defines must not be changed without changing the protocol version */
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#define DP_HARDBARRIER 1 /* depricated */
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#define DP_RW_SYNC 2 /* equals REQ_SYNC */
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#define DP_MAY_SET_IN_SYNC 4
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#define DP_UNPLUG 8 /* not used anymore */
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#define DP_FUA 16 /* equals REQ_FUA */
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#define DP_FLUSH 32 /* equals REQ_FLUSH */
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#define DP_DISCARD 64 /* equals REQ_DISCARD */
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#define DP_SEND_RECEIVE_ACK 128 /* This is a proto B write request */
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#define DP_SEND_WRITE_ACK 256 /* This is a proto C write request */
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struct p_data {
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u64 sector; /* 64 bits sector number */
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u64 block_id; /* to identify the request in protocol B&C */
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u32 seq_num;
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u32 dp_flags;
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} __packed;
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struct p_trim {
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struct p_data p_data;
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u32 size; /* == bio->bi_size */
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} __packed;
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/*
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* commands which share a struct:
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* p_block_ack:
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* P_RECV_ACK (proto B), P_WRITE_ACK (proto C),
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* P_SUPERSEDED (proto C, two-primaries conflict detection)
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* p_block_req:
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* P_DATA_REQUEST, P_RS_DATA_REQUEST
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*/
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struct p_block_ack {
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u64 sector;
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u64 block_id;
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u32 blksize;
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u32 seq_num;
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} __packed;
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struct p_block_req {
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u64 sector;
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u64 block_id;
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u32 blksize;
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u32 pad; /* to multiple of 8 Byte */
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} __packed;
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/*
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* commands with their own struct for additional fields:
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* P_CONNECTION_FEATURES
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* P_BARRIER
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* P_BARRIER_ACK
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* P_SYNC_PARAM
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* ReportParams
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*/
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#define FF_TRIM 1
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struct p_connection_features {
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u32 protocol_min;
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u32 feature_flags;
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u32 protocol_max;
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/* should be more than enough for future enhancements
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* for now, feature_flags and the reserved array shall be zero.
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*/
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u32 _pad;
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u64 reserved[7];
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} __packed;
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struct p_barrier {
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u32 barrier; /* barrier number _handle_ only */
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u32 pad; /* to multiple of 8 Byte */
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} __packed;
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struct p_barrier_ack {
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u32 barrier;
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u32 set_size;
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} __packed;
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struct p_rs_param {
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u32 resync_rate;
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/* Since protocol version 88 and higher. */
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char verify_alg[0];
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} __packed;
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struct p_rs_param_89 {
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u32 resync_rate;
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/* protocol version 89: */
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char verify_alg[SHARED_SECRET_MAX];
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char csums_alg[SHARED_SECRET_MAX];
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} __packed;
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struct p_rs_param_95 {
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u32 resync_rate;
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char verify_alg[SHARED_SECRET_MAX];
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char csums_alg[SHARED_SECRET_MAX];
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u32 c_plan_ahead;
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u32 c_delay_target;
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u32 c_fill_target;
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u32 c_max_rate;
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} __packed;
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enum drbd_conn_flags {
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CF_DISCARD_MY_DATA = 1,
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CF_DRY_RUN = 2,
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};
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struct p_protocol {
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u32 protocol;
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u32 after_sb_0p;
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u32 after_sb_1p;
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u32 after_sb_2p;
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u32 conn_flags;
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u32 two_primaries;
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/* Since protocol version 87 and higher. */
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char integrity_alg[0];
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} __packed;
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struct p_uuids {
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u64 uuid[UI_EXTENDED_SIZE];
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} __packed;
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struct p_rs_uuid {
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u64 uuid;
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} __packed;
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struct p_sizes {
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u64 d_size; /* size of disk */
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u64 u_size; /* user requested size */
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u64 c_size; /* current exported size */
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u32 max_bio_size; /* Maximal size of a BIO */
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u16 queue_order_type; /* not yet implemented in DRBD*/
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u16 dds_flags; /* use enum dds_flags here. */
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} __packed;
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struct p_state {
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u32 state;
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} __packed;
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struct p_req_state {
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u32 mask;
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u32 val;
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} __packed;
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struct p_req_state_reply {
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u32 retcode;
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} __packed;
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struct p_drbd06_param {
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u64 size;
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u32 state;
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u32 blksize;
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u32 protocol;
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u32 version;
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u32 gen_cnt[5];
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u32 bit_map_gen[5];
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} __packed;
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struct p_block_desc {
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u64 sector;
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u32 blksize;
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u32 pad; /* to multiple of 8 Byte */
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} __packed;
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/* Valid values for the encoding field.
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* Bump proto version when changing this. */
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enum drbd_bitmap_code {
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/* RLE_VLI_Bytes = 0,
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* and other bit variants had been defined during
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* algorithm evaluation. */
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RLE_VLI_Bits = 2,
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};
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struct p_compressed_bm {
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/* (encoding & 0x0f): actual encoding, see enum drbd_bitmap_code
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* (encoding & 0x80): polarity (set/unset) of first runlength
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* ((encoding >> 4) & 0x07): pad_bits, number of trailing zero bits
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* used to pad up to head.length bytes
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*/
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u8 encoding;
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u8 code[0];
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} __packed;
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struct p_delay_probe93 {
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u32 seq_num; /* sequence number to match the two probe packets */
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u32 offset; /* usecs the probe got sent after the reference time point */
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} __packed;
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/*
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* Bitmap packets need to fit within a single page on the sender and receiver,
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* so we are limited to 4 KiB (and not to PAGE_SIZE, which can be bigger).
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*/
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#define DRBD_SOCKET_BUFFER_SIZE 4096
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#endif /* __DRBD_PROTOCOL_H */
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