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Merge branch 'for-next-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

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* 'for-next-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
  ib_srpt: Initial SRP Target merge for v3.3-rc1
This commit is contained in:
Linus Torvalds 2012-01-18 16:29:42 -08:00
commit f59e842fc0
7 changed files with 4672 additions and 0 deletions
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1
drivers/infiniband/Kconfig
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@ -55,6 +55,7 @@ source "drivers/infiniband/hw/nes/Kconfig"
source "drivers/infiniband/ulp/ipoib/Kconfig"
source "drivers/infiniband/ulp/srp/Kconfig"
source "drivers/infiniband/ulp/srpt/Kconfig"
source "drivers/infiniband/ulp/iser/Kconfig"

1
drivers/infiniband/Makefile
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@ -10,4 +10,5 @@ obj-$(CONFIG_MLX4_INFINIBAND) += hw/mlx4/
obj-$(CONFIG_INFINIBAND_NES) += hw/nes/
obj-$(CONFIG_INFINIBAND_IPOIB) += ulp/ipoib/
obj-$(CONFIG_INFINIBAND_SRP) += ulp/srp/
obj-$(CONFIG_INFINIBAND_SRPT) += ulp/srpt/
obj-$(CONFIG_INFINIBAND_ISER) += ulp/iser/

12
drivers/infiniband/ulp/srpt/Kconfig Normal file
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@ -0,0 +1,12 @@
config INFINIBAND_SRPT
tristate "InfiniBand SCSI RDMA Protocol target support"
depends on INFINIBAND && TARGET_CORE
---help---
Support for the SCSI RDMA Protocol (SRP) Target driver. The
SRP protocol is a protocol that allows an initiator to access
a block storage device on another host (target) over a network
that supports the RDMA protocol. Currently the RDMA protocol is
supported by InfiniBand and by iWarp network hardware. More
information about the SRP protocol can be found on the website
of the INCITS T10 technical committee (http://www.t10.org/).

2
drivers/infiniband/ulp/srpt/Makefile Normal file
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@ -0,0 +1,2 @@
ccflags-y := -Idrivers/target
obj-$(CONFIG_INFINIBAND_SRPT) += ib_srpt.o

139
drivers/infiniband/ulp/srpt/ib_dm_mad.h Normal file
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@ -0,0 +1,139 @@
/*
* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#ifndef IB_DM_MAD_H
#define IB_DM_MAD_H
#include <linux/types.h>
#include <rdma/ib_mad.h>
enum {
/*
* See also section 13.4.7 Status Field, table 115 MAD Common Status
* Field Bit Values and also section 16.3.1.1 Status Field in the
* InfiniBand Architecture Specification.
*/
DM_MAD_STATUS_UNSUP_METHOD = 0x0008,
DM_MAD_STATUS_UNSUP_METHOD_ATTR = 0x000c,
DM_MAD_STATUS_INVALID_FIELD = 0x001c,
DM_MAD_STATUS_NO_IOC = 0x0100,
/*
* See also the Device Management chapter, section 16.3.3 Attributes,
* table 279 Device Management Attributes in the InfiniBand
* Architecture Specification.
*/
DM_ATTR_CLASS_PORT_INFO = 0x01,
DM_ATTR_IOU_INFO = 0x10,
DM_ATTR_IOC_PROFILE = 0x11,
DM_ATTR_SVC_ENTRIES = 0x12
};
struct ib_dm_hdr {
u8 reserved[28];
};
/*
* Structure of management datagram sent by the SRP target implementation.
* Contains a management datagram header, reliable multi-packet transaction
* protocol (RMPP) header and ib_dm_hdr. Notes:
* - The SRP target implementation does not use RMPP or ib_dm_hdr when sending
* management datagrams.
* - The header size must be exactly 64 bytes (IB_MGMT_DEVICE_HDR), since this
* is the header size that is passed to ib_create_send_mad() in ib_srpt.c.
* - The maximum supported size for a management datagram when not using RMPP
* is 256 bytes -- 64 bytes header and 192 (IB_MGMT_DEVICE_DATA) bytes data.
*/
struct ib_dm_mad {
struct ib_mad_hdr mad_hdr;
struct ib_rmpp_hdr rmpp_hdr;
struct ib_dm_hdr dm_hdr;
u8 data[IB_MGMT_DEVICE_DATA];
};
/*
* IOUnitInfo as defined in section 16.3.3.3 IOUnitInfo of the InfiniBand
* Architecture Specification.
*/
struct ib_dm_iou_info {
__be16 change_id;
u8 max_controllers;
u8 op_rom;
u8 controller_list[128];
};
/*
* IOControllerprofile as defined in section 16.3.3.4 IOControllerProfile of
* the InfiniBand Architecture Specification.
*/
struct ib_dm_ioc_profile {
__be64 guid;
__be32 vendor_id;
__be32 device_id;
__be16 device_version;
__be16 reserved1;
__be32 subsys_vendor_id;
__be32 subsys_device_id;
__be16 io_class;
__be16 io_subclass;
__be16 protocol;
__be16 protocol_version;
__be16 service_conn;
__be16 initiators_supported;
__be16 send_queue_depth;
u8 reserved2;
u8 rdma_read_depth;
__be32 send_size;
__be32 rdma_size;
u8 op_cap_mask;
u8 svc_cap_mask;
u8 num_svc_entries;
u8 reserved3[9];
u8 id_string[64];
};
struct ib_dm_svc_entry {
u8 name[40];
__be64 id;
};
/*
* See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
* Specification. See also section B.7, table B.8 in the T10 SRP r16a document.
*/
struct ib_dm_svc_entries {
struct ib_dm_svc_entry service_entries[4];
};
#endif

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drivers/infiniband/ulp/srpt/ib_srpt.c Normal file
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drivers/infiniband/ulp/srpt/ib_srpt.h Normal file
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/*
* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
* Copyright (C) 2009 - 2010 Bart Van Assche <bvanassche@acm.org>.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#ifndef IB_SRPT_H
#define IB_SRPT_H
#include <linux/version.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_sa.h>
#include <rdma/ib_cm.h>
#include <scsi/srp.h>
#include "ib_dm_mad.h"
/*
* The prefix the ServiceName field must start with in the device management
* ServiceEntries attribute pair. See also the SRP specification.
*/
#define SRP_SERVICE_NAME_PREFIX "SRP.T10:"
enum {
/*
* SRP IOControllerProfile attributes for SRP target ports that have
* not been defined in <scsi/srp.h>. Source: section B.7, table B.7
* in the SRP specification.
*/
SRP_PROTOCOL = 0x0108,
SRP_PROTOCOL_VERSION = 0x0001,
SRP_IO_SUBCLASS = 0x609e,
SRP_SEND_TO_IOC = 0x01,
SRP_SEND_FROM_IOC = 0x02,
SRP_RDMA_READ_FROM_IOC = 0x08,
SRP_RDMA_WRITE_FROM_IOC = 0x20,
/*
* srp_login_cmd.req_flags bitmasks. See also table 9 in the SRP
* specification.
*/
SRP_MTCH_ACTION = 0x03, /* MULTI-CHANNEL ACTION */
SRP_LOSOLNT = 0x10, /* logout solicited notification */
SRP_CRSOLNT = 0x20, /* credit request solicited notification */
SRP_AESOLNT = 0x40, /* asynchronous event solicited notification */
/*
* srp_cmd.sol_nt / srp_tsk_mgmt.sol_not bitmasks. See also tables
* 18 and 20 in the SRP specification.
*/
SRP_SCSOLNT = 0x02, /* SCSOLNT = successful solicited notification */
SRP_UCSOLNT = 0x04, /* UCSOLNT = unsuccessful solicited notification */
/*
* srp_rsp.sol_not / srp_t_logout.sol_not bitmasks. See also tables
* 16 and 22 in the SRP specification.
*/
SRP_SOLNT = 0x01, /* SOLNT = solicited notification */
/* See also table 24 in the SRP specification. */
SRP_TSK_MGMT_SUCCESS = 0x00,
SRP_TSK_MGMT_FUNC_NOT_SUPP = 0x04,
SRP_TSK_MGMT_FAILED = 0x05,
/* See also table 21 in the SRP specification. */
SRP_CMD_SIMPLE_Q = 0x0,
SRP_CMD_HEAD_OF_Q = 0x1,
SRP_CMD_ORDERED_Q = 0x2,
SRP_CMD_ACA = 0x4,
SRP_LOGIN_RSP_MULTICHAN_NO_CHAN = 0x0,
SRP_LOGIN_RSP_MULTICHAN_TERMINATED = 0x1,
SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2,
SRPT_DEF_SG_TABLESIZE = 128,
SRPT_DEF_SG_PER_WQE = 16,
MIN_SRPT_SQ_SIZE = 16,
DEF_SRPT_SQ_SIZE = 4096,
SRPT_RQ_SIZE = 128,
MIN_SRPT_SRQ_SIZE = 4,
DEFAULT_SRPT_SRQ_SIZE = 4095,
MAX_SRPT_SRQ_SIZE = 65535,
MAX_SRPT_RDMA_SIZE = 1U << 24,
MAX_SRPT_RSP_SIZE = 1024,
MIN_MAX_REQ_SIZE = 996,
DEFAULT_MAX_REQ_SIZE
= sizeof(struct srp_cmd)/*48*/
+ sizeof(struct srp_indirect_buf)/*20*/
+ 128 * sizeof(struct srp_direct_buf)/*16*/,
MIN_MAX_RSP_SIZE = sizeof(struct srp_rsp)/*36*/ + 4,
DEFAULT_MAX_RSP_SIZE = 256, /* leaves 220 bytes for sense data */
DEFAULT_MAX_RDMA_SIZE = 65536,
};
enum srpt_opcode {
SRPT_RECV,
SRPT_SEND,
SRPT_RDMA_MID,
SRPT_RDMA_ABORT,
SRPT_RDMA_READ_LAST,
SRPT_RDMA_WRITE_LAST,
};
static inline u64 encode_wr_id(u8 opcode, u32 idx)
{
return ((u64)opcode << 32) | idx;
}
static inline enum srpt_opcode opcode_from_wr_id(u64 wr_id)
{
return wr_id >> 32;
}
static inline u32 idx_from_wr_id(u64 wr_id)
{
return (u32)wr_id;
}
struct rdma_iu {
u64 raddr;
u32 rkey;
struct ib_sge *sge;
u32 sge_cnt;
int mem_id;
};
/**
* enum srpt_command_state - SCSI command state managed by SRPT.
* @SRPT_STATE_NEW: New command arrived and is being processed.
* @SRPT_STATE_NEED_DATA: Processing a write or bidir command and waiting
* for data arrival.
* @SRPT_STATE_DATA_IN: Data for the write or bidir command arrived and is
* being processed.
* @SRPT_STATE_CMD_RSP_SENT: SRP_RSP for SRP_CMD has been sent.
* @SRPT_STATE_MGMT: Processing a SCSI task management command.
* @SRPT_STATE_MGMT_RSP_SENT: SRP_RSP for SRP_TSK_MGMT has been sent.
* @SRPT_STATE_DONE: Command processing finished successfully, command
* processing has been aborted or command processing
* failed.
*/
enum srpt_command_state {
SRPT_STATE_NEW = 0,
SRPT_STATE_NEED_DATA = 1,
SRPT_STATE_DATA_IN = 2,
SRPT_STATE_CMD_RSP_SENT = 3,
SRPT_STATE_MGMT = 4,
SRPT_STATE_MGMT_RSP_SENT = 5,
SRPT_STATE_DONE = 6,
};
/**
* struct srpt_ioctx - Shared SRPT I/O context information.
* @buf: Pointer to the buffer.
* @dma: DMA address of the buffer.
* @index: Index of the I/O context in its ioctx_ring array.
*/
struct srpt_ioctx {
void *buf;
dma_addr_t dma;
uint32_t index;
};
/**
* struct srpt_recv_ioctx - SRPT receive I/O context.
* @ioctx: See above.
* @wait_list: Node for insertion in srpt_rdma_ch.cmd_wait_list.
*/
struct srpt_recv_ioctx {
struct srpt_ioctx ioctx;
struct list_head wait_list;
};
/**
* struct srpt_send_ioctx - SRPT send I/O context.
* @ioctx: See above.
* @ch: Channel pointer.
* @free_list: Node in srpt_rdma_ch.free_list.
* @n_rbuf: Number of data buffers in the received SRP command.
* @rbufs: Pointer to SRP data buffer array.
* @single_rbuf: SRP data buffer if the command has only a single buffer.
* @sg: Pointer to sg-list associated with this I/O context.
* @sg_cnt: SG-list size.
* @mapped_sg_count: ib_dma_map_sg() return value.
* @n_rdma_ius: Number of elements in the rdma_ius array.
* @rdma_ius: Array with information about the RDMA mapping.
* @tag: Tag of the received SRP information unit.
* @spinlock: Protects 'state'.
* @state: I/O context state.
* @rdma_aborted: If initiating a multipart RDMA transfer failed, whether
* the already initiated transfers have finished.
* @cmd: Target core command data structure.
* @sense_data: SCSI sense data.
*/
struct srpt_send_ioctx {
struct srpt_ioctx ioctx;
struct srpt_rdma_ch *ch;
struct kref kref;
struct rdma_iu *rdma_ius;
struct srp_direct_buf *rbufs;
struct srp_direct_buf single_rbuf;
struct scatterlist *sg;
struct list_head free_list;
spinlock_t spinlock;
enum srpt_command_state state;
bool rdma_aborted;
struct se_cmd cmd;
struct completion tx_done;
u64 tag;
int sg_cnt;
int mapped_sg_count;
u16 n_rdma_ius;
u8 n_rdma;
u8 n_rbuf;
bool queue_status_only;
u8 sense_data[SCSI_SENSE_BUFFERSIZE];
};
/**
* enum rdma_ch_state - SRP channel state.
* @CH_CONNECTING: QP is in RTR state; waiting for RTU.
* @CH_LIVE: QP is in RTS state.
* @CH_DISCONNECTING: DREQ has been received; waiting for DREP
* or DREQ has been send and waiting for DREP
* or .
* @CH_DRAINING: QP is in ERR state; waiting for last WQE event.
* @CH_RELEASING: Last WQE event has been received; releasing resources.
*/
enum rdma_ch_state {
CH_CONNECTING,
CH_LIVE,
CH_DISCONNECTING,
CH_DRAINING,
CH_RELEASING
};
/**
* struct srpt_rdma_ch - RDMA channel.
* @wait_queue: Allows the kernel thread to wait for more work.
* @thread: Kernel thread that processes the IB queues associated with
* the channel.
* @cm_id: IB CM ID associated with the channel.
* @qp: IB queue pair used for communicating over this channel.
* @cq: IB completion queue for this channel.
* @rq_size: IB receive queue size.
* @rsp_size IB response message size in bytes.
* @sq_wr_avail: number of work requests available in the send queue.
* @sport: pointer to the information of the HCA port used by this
* channel.
* @i_port_id: 128-bit initiator port identifier copied from SRP_LOGIN_REQ.
* @t_port_id: 128-bit target port identifier copied from SRP_LOGIN_REQ.
* @max_ti_iu_len: maximum target-to-initiator information unit length.
* @req_lim: request limit: maximum number of requests that may be sent
* by the initiator without having received a response.
* @req_lim_delta: Number of credits not yet sent back to the initiator.
* @spinlock: Protects free_list and state.
* @free_list: Head of list with free send I/O contexts.
* @state: channel state. See also enum rdma_ch_state.
* @ioctx_ring: Send ring.
* @wc: IB work completion array for srpt_process_completion().
* @list: Node for insertion in the srpt_device.rch_list list.
* @cmd_wait_list: List of SCSI commands that arrived before the RTU event. This
* list contains struct srpt_ioctx elements and is protected
* against concurrent modification by the cm_id spinlock.
* @sess: Session information associated with this SRP channel.
* @sess_name: Session name.
* @release_work: Allows scheduling of srpt_release_channel().
* @release_done: Enables waiting for srpt_release_channel() completion.
*/
struct srpt_rdma_ch {
wait_queue_head_t wait_queue;
struct task_struct *thread;
struct ib_cm_id *cm_id;
struct ib_qp *qp;
struct ib_cq *cq;
int rq_size;
u32 rsp_size;
atomic_t sq_wr_avail;
struct srpt_port *sport;
u8 i_port_id[16];
u8 t_port_id[16];
int max_ti_iu_len;
atomic_t req_lim;
atomic_t req_lim_delta;
spinlock_t spinlock;
struct list_head free_list;
enum rdma_ch_state state;
struct srpt_send_ioctx **ioctx_ring;
struct ib_wc wc[16];
struct list_head list;
struct list_head cmd_wait_list;
struct se_session *sess;
u8 sess_name[36];
struct work_struct release_work;
struct completion *release_done;
};
/**
* struct srpt_port_attib - Attributes for SRPT port
* @srp_max_rdma_size: Maximum size of SRP RDMA transfers for new connections.
* @srp_max_rsp_size: Maximum size of SRP response messages in bytes.
* @srp_sq_size: Shared receive queue (SRQ) size.
*/
struct srpt_port_attrib {
u32 srp_max_rdma_size;
u32 srp_max_rsp_size;
u32 srp_sq_size;
};
/**
* struct srpt_port - Information associated by SRPT with a single IB port.
* @sdev: backpointer to the HCA information.
* @mad_agent: per-port management datagram processing information.
* @enabled: Whether or not this target port is enabled.
* @port_guid: ASCII representation of Port GUID
* @port: one-based port number.
* @sm_lid: cached value of the port's sm_lid.
* @lid: cached value of the port's lid.
* @gid: cached value of the port's gid.
* @port_acl_lock spinlock for port_acl_list:
* @work: work structure for refreshing the aforementioned cached values.
* @port_tpg_1 Target portal group = 1 data.
* @port_wwn: Target core WWN data.
* @port_acl_list: Head of the list with all node ACLs for this port.
*/
struct srpt_port {
struct srpt_device *sdev;
struct ib_mad_agent *mad_agent;
bool enabled;
u8 port_guid[64];
u8 port;
u16 sm_lid;
u16 lid;
union ib_gid gid;
spinlock_t port_acl_lock;
struct work_struct work;
struct se_portal_group port_tpg_1;
struct se_wwn port_wwn;
struct list_head port_acl_list;
struct srpt_port_attrib port_attrib;
};
/**
* struct srpt_device - Information associated by SRPT with a single HCA.
* @device: Backpointer to the struct ib_device managed by the IB core.
* @pd: IB protection domain.
* @mr: L_Key (local key) with write access to all local memory.
* @srq: Per-HCA SRQ (shared receive queue).
* @cm_id: Connection identifier.
* @dev_attr: Attributes of the InfiniBand device as obtained during the
* ib_client.add() callback.
* @srq_size: SRQ size.
* @ioctx_ring: Per-HCA SRQ.
* @rch_list: Per-device channel list -- see also srpt_rdma_ch.list.
* @ch_releaseQ: Enables waiting for removal from rch_list.
* @spinlock: Protects rch_list and tpg.
* @port: Information about the ports owned by this HCA.
* @event_handler: Per-HCA asynchronous IB event handler.
* @list: Node in srpt_dev_list.
*/
struct srpt_device {
struct ib_device *device;
struct ib_pd *pd;
struct ib_mr *mr;
struct ib_srq *srq;
struct ib_cm_id *cm_id;
struct ib_device_attr dev_attr;
int srq_size;
struct srpt_recv_ioctx **ioctx_ring;
struct list_head rch_list;
wait_queue_head_t ch_releaseQ;
spinlock_t spinlock;
struct srpt_port port[2];
struct ib_event_handler event_handler;
struct list_head list;
};
/**
* struct srpt_node_acl - Per-initiator ACL data (managed via configfs).
* @i_port_id: 128-bit SRP initiator port ID.
* @sport: port information.
* @nacl: Target core node ACL information.
* @list: Element of the per-HCA ACL list.
*/
struct srpt_node_acl {
u8 i_port_id[16];
struct srpt_port *sport;
struct se_node_acl nacl;
struct list_head list;
};
/*
* SRP-releated SCSI persistent reservation definitions.
*
* See also SPC4r28, section 7.6.1 (Protocol specific parameters introduction).
* See also SPC4r28, section 7.6.4.5 (TransportID for initiator ports using
* SCSI over an RDMA interface).
*/
enum {
SCSI_TRANSPORTID_PROTOCOLID_SRP = 4,
};
struct spc_rdma_transport_id {
uint8_t protocol_identifier;
uint8_t reserved[7];
uint8_t i_port_id[16];
};
#endif /* IB_SRPT_H */