[PATCH v7 15/25] block/rnbd: private headers with rnbd protocol structs and helpers

Jack Wang
2020-01-16T12:59:47Z

From: Jack Wang <jinpu.wang@cloud.ionos.com>

These are common private headers with rnbd protocol structures,
logging, sysfs and other helper functions, which are used on
both client and server sides.

Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
drivers/block/rnbd/rnbd-common.c | 25 +++
drivers/block/rnbd/rnbd-log.h | 43 +++++
drivers/block/rnbd/rnbd-proto.h | 307 +++++++++++++++++++++++++++++++
3 files changed, 375 insertions(+)
create mode 100644 drivers/block/rnbd/rnbd-common.c
create mode 100644 drivers/block/rnbd/rnbd-log.h
create mode 100644 drivers/block/rnbd/rnbd-proto.h

diff --git a/drivers/block/rnbd/rnbd-common.c b/drivers/block/rnbd/rnbd-common.c
new file mode 100644
index 000000000000..63031fd64118
--- /dev/null
+++ b/drivers/block/rnbd/rnbd-common.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RDMA Network Block Driver
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ *
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ *
+ * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
+ */
+#include "rnbd-proto.h"
+
+const char *rnbd_access_mode_str(enum rnbd_access_mode mode)
+{
+ switch (mode) {
+ case RNBD_ACCESS_RO:
+ return "ro";
+ case RNBD_ACCESS_RW:
+ return "rw";
+ case RNBD_ACCESS_MIGRATION:
+ return "migration";
+ default:
+ return "unknown";
+ }
+}
diff --git a/drivers/block/rnbd/rnbd-log.h b/drivers/block/rnbd/rnbd-log.h
new file mode 100644
index 000000000000..1d30cae7560e
--- /dev/null
+++ b/drivers/block/rnbd/rnbd-log.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * RDMA Network Block Driver
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ *
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ *
+ * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
+ */
+#ifndef RNBD_LOG_H
+#define RNBD_LOG_H
+
+#include "rnbd-clt.h"
+#include "rnbd-srv.h"
+
+#define rnbd_clt_log(fn, dev, fmt, ...) ( \
+ fn("<%s@%s> " fmt, (dev)->pathname, \
+ (dev)->sess->sessname, \
+ ##__VA_ARGS__))
+#define rnbd_srv_log(fn, dev, fmt, ...) ( \
+ fn("<%s@%s>: " fmt, (dev)->pathname, \
+ (dev)->sess->sessname, ##__VA_ARGS__))
+
+#define rnbd_clt_err(dev, fmt, ...) \
+ rnbd_clt_log(pr_err, dev, fmt, ##__VA_ARGS__)
+#define rnbd_clt_err_rl(dev, fmt, ...) \
+ rnbd_clt_log(pr_err_ratelimited, dev, fmt, ##__VA_ARGS__)
+#define rnbd_clt_info(dev, fmt, ...) \
+ rnbd_clt_log(pr_info, dev, fmt, ##__VA_ARGS__)
+#define rnbd_clt_info_rl(dev, fmt, ...) \
+ rnbd_clt_log(pr_info_ratelimited, dev, fmt, ##__VA_ARGS__)
+
+#define rnbd_srv_err(dev, fmt, ...) \
+ rnbd_srv_log(pr_err, dev, fmt, ##__VA_ARGS__)
+#define rnbd_srv_err_rl(dev, fmt, ...) \
+ rnbd_srv_log(pr_err_ratelimited, dev, fmt, ##__VA_ARGS__)
+#define rnbd_srv_info(dev, fmt, ...) \
+ rnbd_srv_log(pr_info, dev, fmt, ##__VA_ARGS__)
+#define rnbd_srv_info_rl(dev, fmt, ...) \
+ rnbd_srv_log(pr_info_ratelimited, dev, fmt, ##__VA_ARGS__)
+
+#endif /* RNBD_LOG_H */
diff --git a/drivers/block/rnbd/rnbd-proto.h b/drivers/block/rnbd/rnbd-proto.h
new file mode 100644
index 000000000000..10dda4ce5ae8
--- /dev/null
+++ b/drivers/block/rnbd/rnbd-proto.h
@@ -0,0 +1,307 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * RDMA Network Block Driver
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ *
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ *
+ * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
+ */
+#ifndef RNBD_PROTO_H
+#define RNBD_PROTO_H
+
+#include <linux/types.h>
+#include <linux/blkdev.h>
+#include <linux/limits.h>
+#include <linux/inet.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <rdma/ib.h>
+
+#define RNBD_PROTO_VER_MAJOR 2
+#define RNBD_PROTO_VER_MINOR 0
+
+#define RNBD_PROTO_VER_STRING __stringify(RNBD_PROTO_VER_MAJOR) "." \
+ __stringify(RNBD_PROTO_VER_MINOR)
+
+#define RTRS_PORT 1234
+
+/**
+ * enum rnbd_msg_types - RNBD message types
+ * @RNBD_MSG_SESS_INFO: initial session info from client to server
+ * @RNBD_MSG_SESS_INFO_RSP: initial session info from server to client
+ * @RNBD_MSG_OPEN: open (map) device request
+ * @RNBD_MSG_OPEN_RSP: response to an @RNBD_MSG_OPEN
+ * @RNBD_MSG_IO: block IO request operation
+ * @RNBD_MSG_CLOSE: close (unmap) device request
+ */
+enum rnbd_msg_type {
+ RNBD_MSG_SESS_INFO,
+ RNBD_MSG_SESS_INFO_RSP,
+ RNBD_MSG_OPEN,
+ RNBD_MSG_OPEN_RSP,
+ RNBD_MSG_IO,
+ RNBD_MSG_CLOSE,
+};
+
+/**
+ * struct rnbd_msg_hdr - header of RNBD messages
+ * @type: Message type, valid values see: enum rnbd_msg_types
+ */
+struct rnbd_msg_hdr {
+ __le16 type;
+ __le16 __padding;
+};
+
+/**
+ * We allow to map RO many times and RW only once. We allow to map yet another
+ * time RW, if MIGRATION is provided (second RW export can be required for
+ * example for VM migration)
+ */
+enum rnbd_access_mode {
+ RNBD_ACCESS_RO,
+ RNBD_ACCESS_RW,
+ RNBD_ACCESS_MIGRATION,
+};
+
+/**
+ * struct rnbd_msg_sess_info - initial session info from client to server
+ * @hdr: message header
+ * @ver: RNBD protocol version
+ */
+struct rnbd_msg_sess_info {
+ struct rnbd_msg_hdr hdr;
+ u8 ver;
+ u8 reserved[31];
+};
+
+/**
+ * struct rnbd_msg_sess_info_rsp - initial session info from server to client
+ * @hdr: message header
+ * @ver: RNBD protocol version
+ */
+struct rnbd_msg_sess_info_rsp {
+ struct rnbd_msg_hdr hdr;
+ u8 ver;
+ u8 reserved[31];
+};
+
+/**
+ * struct rnbd_msg_open - request to open a remote device.
+ * @hdr: message header
+ * @access_mode: the mode to open remote device, valid values see:
+ * enum rnbd_access_mode
+ * @device_name: device path on remote side
+ */
+struct rnbd_msg_open {
+ struct rnbd_msg_hdr hdr;
+ u8 access_mode;
+ u8 resv1;
+ s8 dev_name[NAME_MAX];
+ u8 reserved[3];
+};
+
+/**
+ * struct rnbd_msg_close - request to close a remote device.
+ * @hdr: message header
+ * @device_id: device_id on server side to identify the device
+ */
+struct rnbd_msg_close {
+ struct rnbd_msg_hdr hdr;
+ __le32 device_id;
+};
+
+/**
+ * struct rnbd_msg_open_rsp - response message to RNBD_MSG_OPEN
+ * @hdr: message header
+ * @device_id: device_id on server side to identify the device
+ * @nsectors: number of sectors in the usual 512b unit
+ * @max_hw_sectors: max hardware sectors in the usual 512b unit
+ * @max_write_same_sectors: max sectors for WRITE SAME in the 512b unit
+ * @max_discard_sectors: max. sectors that can be discarded at once in 512b
+ * unit.
+ * @discard_granularity: size of the internal discard allocation unit in bytes
+ * @discard_alignment: offset from internal allocation assignment in bytes
+ * @physical_block_size: physical block size device supports in bytes
+ * @logical_block_size: logical block size device supports in bytes
+ * @max_segments: max segments hardware support in one transfer
+ * @secure_discard: supports secure discard
+ * @rotation: is a rotational disc?
+ */
+struct rnbd_msg_open_rsp {
+ struct rnbd_msg_hdr hdr;
+ __le32 device_id;
+ __le64 nsectors;
+ __le32 max_hw_sectors;
+ __le32 max_write_same_sectors;
+ __le32 max_discard_sectors;
+ __le32 discard_granularity;
+ __le32 discard_alignment;
+ __le16 physical_block_size;
+ __le16 logical_block_size;
+ __le16 max_segments;
+ __le16 secure_discard;
+ u8 rotational;
+ u8 reserved[11];
+};
+
+/**
+ * struct rnbd_msg_io - message for I/O read/write
+ * @hdr: message header
+ * @device_id: device_id on server side to find the right device
+ * @sector: bi_sector attribute from struct bio
+ * @rw: valid values are defined in enum rnbd_io_flags
+ * @bi_size: number of bytes for I/O read/write
+ * @prio: priority
+ */
+struct rnbd_msg_io {
+ struct rnbd_msg_hdr hdr;
+ __le32 device_id;
+ __le64 sector;
+ __le32 rw;
+ __le32 bi_size;
+ __le16 prio;
+};
+
+#define RNBD_OP_BITS 8
+#define RNBD_OP_MASK ((1 << RNBD_OP_BITS) - 1)
+
+/**
+ * enum rnbd_io_flags - RNBD request types from rq_flag_bits
+ * @RNBD_OP_READ: read sectors from the device
+ * @RNBD_OP_WRITE: write sectors to the device
+ * @RNBD_OP_FLUSH: flush the volatile write cache
+ * @RNBD_OP_DISCARD: discard sectors
+ * @RNBD_OP_SECURE_ERASE: securely erase sectors
+ * @RNBD_OP_WRITE_SAME: write the same sectors many times
+
+ * @RNBD_F_SYNC: request is sync (sync write or read)
+ * @RNBD_F_FUA: forced unit access
+ */
+enum rnbd_io_flags {
+
+ /* Operations */
+
+ RNBD_OP_READ = 0,
+ RNBD_OP_WRITE = 1,
+ RNBD_OP_FLUSH = 2,
+ RNBD_OP_DISCARD = 3,
+ RNBD_OP_SECURE_ERASE = 4,
+ RNBD_OP_WRITE_SAME = 5,
+
+ RNBD_OP_LAST,
+
+ /* Flags */
+
+ RNBD_F_SYNC = 1<<(RNBD_OP_BITS + 0),
+ RNBD_F_FUA = 1<<(RNBD_OP_BITS + 1),
+
+ RNBD_F_ALL = (RNBD_F_SYNC | RNBD_F_FUA)
+
+};
+
+static inline u32 rnbd_op(u32 flags)
+{
+ return (flags & RNBD_OP_MASK);
+}
+
+static inline u32 rnbd_flags(u32 flags)
+{
+ return (flags & ~RNBD_OP_MASK);
+}
+
+static inline bool rnbd_flags_supported(u32 flags)
+{
+ u32 op;
+
+ op = rnbd_op(flags);
+ flags = rnbd_flags(flags);
+
+ if (op >= RNBD_OP_LAST)
+ return false;
+ if (flags & ~RNBD_F_ALL)
+ return false;
+
+ return true;
+}
+
+static inline u32 rnbd_to_bio_flags(u32 rnbd_opf)
+{
+ u32 bio_opf;
+
+ switch (rnbd_op(rnbd_opf)) {
+ case RNBD_OP_READ:
+ bio_opf = REQ_OP_READ;
+ break;
+ case RNBD_OP_WRITE:
+ bio_opf = REQ_OP_WRITE;
+ break;
+ case RNBD_OP_FLUSH:
+ bio_opf = REQ_OP_FLUSH | REQ_PREFLUSH;
+ break;
+ case RNBD_OP_DISCARD:
+ bio_opf = REQ_OP_DISCARD;
+ break;
+ case RNBD_OP_SECURE_ERASE:
+ bio_opf = REQ_OP_SECURE_ERASE;
+ break;
+ case RNBD_OP_WRITE_SAME:
+ bio_opf = REQ_OP_WRITE_SAME;
+ break;
+ default:
+ WARN(1, "Unknown RNBD type: %d (flags %d)\n",
+ rnbd_op(rnbd_opf), rnbd_opf);
+ bio_opf = 0;
+ }
+
+ if (rnbd_opf & RNBD_F_SYNC)
+ bio_opf |= REQ_SYNC;
+
+ if (rnbd_opf & RNBD_F_FUA)
+ bio_opf |= REQ_FUA;
+
+ return bio_opf;
+}
+
+static inline u32 rq_to_rnbd_flags(struct request *rq)
+{
+ u32 rnbd_opf;
+
+ switch (req_op(rq)) {
+ case REQ_OP_READ:
+ rnbd_opf = RNBD_OP_READ;
+ break;
+ case REQ_OP_WRITE:
+ rnbd_opf = RNBD_OP_WRITE;
+ break;
+ case REQ_OP_DISCARD:
+ rnbd_opf = RNBD_OP_DISCARD;
+ break;
+ case REQ_OP_SECURE_ERASE:
+ rnbd_opf = RNBD_OP_SECURE_ERASE;
+ break;
+ case REQ_OP_WRITE_SAME:
+ rnbd_opf = RNBD_OP_WRITE_SAME;
+ break;
+ case REQ_OP_FLUSH:
+ rnbd_opf = RNBD_OP_FLUSH;
+ break;
+ default:
+ WARN(1, "Unknown request type %d (flags %llu)\n",
+ req_op(rq), (unsigned long long)rq->cmd_flags);
+ rnbd_opf = 0;
+ }
+
+ if (op_is_sync(rq->cmd_flags))
+ rnbd_opf |= RNBD_F_SYNC;
+
+ if (op_is_flush(rq->cmd_flags))
+ rnbd_opf |= RNBD_F_FUA;
+
+ return rnbd_opf;
+}
+
+const char *rnbd_access_mode_str(enum rnbd_access_mode mode);
+
+#endif /* RNBD_PROTO_H */
--
2.17.1