419 lines
14 KiB
C
419 lines
14 KiB
C
/*
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* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
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* Copyright (C) 2009 - 2010 Bart Van Assche <bvanassche@acm.org>.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#ifndef IB_SRPT_H
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#define IB_SRPT_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_sa.h>
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#include <rdma/ib_cm.h>
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#include <rdma/rdma_cm.h>
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#include <rdma/rw.h>
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#include <scsi/srp.h>
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#include "ib_dm_mad.h"
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/*
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* The prefix the ServiceName field must start with in the device management
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* ServiceEntries attribute pair. See also the SRP specification.
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*/
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#define SRP_SERVICE_NAME_PREFIX "SRP.T10:"
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struct srpt_nexus;
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enum {
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/*
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* SRP IOControllerProfile attributes for SRP target ports that have
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* not been defined in <scsi/srp.h>. Source: section B.7, table B.7
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* in the SRP specification.
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*/
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SRP_PROTOCOL = 0x0108,
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SRP_PROTOCOL_VERSION = 0x0001,
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SRP_IO_SUBCLASS = 0x609e,
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SRP_SEND_TO_IOC = 0x01,
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SRP_SEND_FROM_IOC = 0x02,
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SRP_RDMA_READ_FROM_IOC = 0x08,
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SRP_RDMA_WRITE_FROM_IOC = 0x20,
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/*
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* srp_login_cmd.req_flags bitmasks. See also table 9 in the SRP
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* specification.
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*/
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SRP_MTCH_ACTION = 0x03, /* MULTI-CHANNEL ACTION */
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SRP_LOSOLNT = 0x10, /* logout solicited notification */
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SRP_CRSOLNT = 0x20, /* credit request solicited notification */
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SRP_AESOLNT = 0x40, /* asynchronous event solicited notification */
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/*
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* srp_cmd.sol_nt / srp_tsk_mgmt.sol_not bitmasks. See also tables
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* 18 and 20 in the SRP specification.
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*/
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SRP_SCSOLNT = 0x02, /* SCSOLNT = successful solicited notification */
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SRP_UCSOLNT = 0x04, /* UCSOLNT = unsuccessful solicited notification */
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/*
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* srp_rsp.sol_not / srp_t_logout.sol_not bitmasks. See also tables
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* 16 and 22 in the SRP specification.
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*/
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SRP_SOLNT = 0x01, /* SOLNT = solicited notification */
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/* See also table 24 in the SRP specification. */
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SRP_TSK_MGMT_SUCCESS = 0x00,
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SRP_TSK_MGMT_FUNC_NOT_SUPP = 0x04,
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SRP_TSK_MGMT_FAILED = 0x05,
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/* See also table 21 in the SRP specification. */
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SRP_CMD_SIMPLE_Q = 0x0,
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SRP_CMD_HEAD_OF_Q = 0x1,
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SRP_CMD_ORDERED_Q = 0x2,
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SRP_CMD_ACA = 0x4,
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SRP_LOGIN_RSP_MULTICHAN_NO_CHAN = 0x0,
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SRP_LOGIN_RSP_MULTICHAN_TERMINATED = 0x1,
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SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2,
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SRPT_DEF_SG_TABLESIZE = 128,
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/*
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* An experimentally determined value that avoids that QP creation
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* fails due to "swiotlb buffer is full" on systems using the swiotlb.
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*/
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SRPT_MAX_SG_PER_WQE = 16,
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MIN_SRPT_SQ_SIZE = 16,
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DEF_SRPT_SQ_SIZE = 4096,
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MAX_SRPT_RQ_SIZE = 128,
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MIN_SRPT_SRQ_SIZE = 4,
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DEFAULT_SRPT_SRQ_SIZE = 4095,
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MAX_SRPT_SRQ_SIZE = 65535,
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MAX_SRPT_RDMA_SIZE = 1U << 24,
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MAX_SRPT_RSP_SIZE = 1024,
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MIN_MAX_REQ_SIZE = 996,
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DEFAULT_MAX_REQ_SIZE
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= sizeof(struct srp_cmd)/*48*/
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+ sizeof(struct srp_indirect_buf)/*20*/
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+ 128 * sizeof(struct srp_direct_buf)/*16*/,
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MIN_MAX_RSP_SIZE = sizeof(struct srp_rsp)/*36*/ + 4,
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DEFAULT_MAX_RSP_SIZE = 256, /* leaves 220 bytes for sense data */
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DEFAULT_MAX_RDMA_SIZE = 65536,
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};
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/**
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* enum srpt_command_state - SCSI command state managed by SRPT
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* @SRPT_STATE_NEW: New command arrived and is being processed.
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* @SRPT_STATE_NEED_DATA: Processing a write or bidir command and waiting
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* for data arrival.
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* @SRPT_STATE_DATA_IN: Data for the write or bidir command arrived and is
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* being processed.
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* @SRPT_STATE_CMD_RSP_SENT: SRP_RSP for SRP_CMD has been sent.
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* @SRPT_STATE_MGMT: Processing a SCSI task management command.
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* @SRPT_STATE_MGMT_RSP_SENT: SRP_RSP for SRP_TSK_MGMT has been sent.
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* @SRPT_STATE_DONE: Command processing finished successfully, command
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* processing has been aborted or command processing
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* failed.
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*/
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enum srpt_command_state {
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SRPT_STATE_NEW = 0,
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SRPT_STATE_NEED_DATA = 1,
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SRPT_STATE_DATA_IN = 2,
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SRPT_STATE_CMD_RSP_SENT = 3,
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SRPT_STATE_MGMT = 4,
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SRPT_STATE_MGMT_RSP_SENT = 5,
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SRPT_STATE_DONE = 6,
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};
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/**
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* struct srpt_ioctx - shared SRPT I/O context information
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* @cqe: Completion queue element.
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* @buf: Pointer to the buffer.
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* @dma: DMA address of the buffer.
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* @index: Index of the I/O context in its ioctx_ring array.
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*/
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struct srpt_ioctx {
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struct ib_cqe cqe;
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void *buf;
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dma_addr_t dma;
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uint32_t index;
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};
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/**
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* struct srpt_recv_ioctx - SRPT receive I/O context
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* @ioctx: See above.
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* @wait_list: Node for insertion in srpt_rdma_ch.cmd_wait_list.
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*/
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struct srpt_recv_ioctx {
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struct srpt_ioctx ioctx;
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struct list_head wait_list;
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};
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struct srpt_rw_ctx {
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struct rdma_rw_ctx rw;
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struct scatterlist *sg;
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unsigned int nents;
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};
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/**
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* struct srpt_send_ioctx - SRPT send I/O context
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* @ioctx: See above.
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* @ch: Channel pointer.
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* @s_rw_ctx: @rw_ctxs points here if only a single rw_ctx is needed.
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* @rw_ctxs: RDMA read/write contexts.
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* @rdma_cqe: RDMA completion queue element.
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* @free_list: Node in srpt_rdma_ch.free_list.
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* @state: I/O context state.
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* @cmd: Target core command data structure.
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* @sense_data: SCSI sense data.
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* @n_rdma: Number of work requests needed to transfer this ioctx.
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* @n_rw_ctx: Size of rw_ctxs array.
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* @queue_status_only: Send a SCSI status back to the initiator but no data.
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* @sense_data: Sense data to be sent to the initiator.
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*/
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struct srpt_send_ioctx {
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struct srpt_ioctx ioctx;
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struct srpt_rdma_ch *ch;
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struct srpt_rw_ctx s_rw_ctx;
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struct srpt_rw_ctx *rw_ctxs;
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struct ib_cqe rdma_cqe;
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struct list_head free_list;
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enum srpt_command_state state;
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struct se_cmd cmd;
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u8 n_rdma;
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u8 n_rw_ctx;
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bool queue_status_only;
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u8 sense_data[TRANSPORT_SENSE_BUFFER];
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};
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/**
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* enum rdma_ch_state - SRP channel state
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* @CH_CONNECTING: QP is in RTR state; waiting for RTU.
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* @CH_LIVE: QP is in RTS state.
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* @CH_DISCONNECTING: DREQ has been sent and waiting for DREP or DREQ has
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* been received.
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* @CH_DRAINING: DREP has been received or waiting for DREP timed out
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* and last work request has been queued.
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* @CH_DISCONNECTED: Last completion has been received.
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*/
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enum rdma_ch_state {
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CH_CONNECTING,
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CH_LIVE,
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CH_DISCONNECTING,
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CH_DRAINING,
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CH_DISCONNECTED,
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};
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/**
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* struct srpt_rdma_ch - RDMA channel
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* @nexus: I_T nexus this channel is associated with.
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* @qp: IB queue pair used for communicating over this channel.
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* @cm_id: IB CM ID associated with the channel.
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* @cq: IB completion queue for this channel.
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* @zw_cqe: Zero-length write CQE.
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* @rcu: RCU head.
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* @kref: kref for this channel.
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* @rq_size: IB receive queue size.
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* @max_rsp_size: Maximum size of an RSP response message in bytes.
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* @sq_wr_avail: number of work requests available in the send queue.
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* @sport: pointer to the information of the HCA port used by this
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* channel.
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* @max_ti_iu_len: maximum target-to-initiator information unit length.
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* @req_lim: request limit: maximum number of requests that may be sent
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* by the initiator without having received a response.
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* @req_lim_delta: Number of credits not yet sent back to the initiator.
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* @spinlock: Protects free_list and state.
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* @free_list: Head of list with free send I/O contexts.
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* @state: channel state. See also enum rdma_ch_state.
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* @using_rdma_cm: Whether the RDMA/CM or IB/CM is used for this channel.
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* @processing_wait_list: Whether or not cmd_wait_list is being processed.
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* @ioctx_ring: Send ring.
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* @ioctx_recv_ring: Receive I/O context ring.
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* @list: Node in srpt_nexus.ch_list.
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* @cmd_wait_list: List of SCSI commands that arrived before the RTU event. This
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* list contains struct srpt_ioctx elements and is protected
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* against concurrent modification by the cm_id spinlock.
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* @pkey: P_Key of the IB partition for this SRP channel.
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* @sess: Session information associated with this SRP channel.
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* @sess_name: Session name.
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* @release_work: Allows scheduling of srpt_release_channel().
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*/
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struct srpt_rdma_ch {
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struct srpt_nexus *nexus;
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struct ib_qp *qp;
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union {
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struct {
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struct ib_cm_id *cm_id;
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} ib_cm;
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struct {
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struct rdma_cm_id *cm_id;
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} rdma_cm;
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};
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struct ib_cq *cq;
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struct ib_cqe zw_cqe;
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struct rcu_head rcu;
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struct kref kref;
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int rq_size;
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u32 max_rsp_size;
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atomic_t sq_wr_avail;
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struct srpt_port *sport;
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int max_ti_iu_len;
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atomic_t req_lim;
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atomic_t req_lim_delta;
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spinlock_t spinlock;
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struct list_head free_list;
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enum rdma_ch_state state;
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struct srpt_send_ioctx **ioctx_ring;
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struct srpt_recv_ioctx **ioctx_recv_ring;
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struct list_head list;
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struct list_head cmd_wait_list;
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uint16_t pkey;
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bool using_rdma_cm;
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bool processing_wait_list;
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struct se_session *sess;
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u8 sess_name[40];
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struct work_struct release_work;
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};
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/**
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* struct srpt_nexus - I_T nexus
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* @rcu: RCU head for this data structure.
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* @entry: srpt_port.nexus_list list node.
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* @ch_list: struct srpt_rdma_ch list. Protected by srpt_port.mutex.
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* @i_port_id: 128-bit initiator port identifier copied from SRP_LOGIN_REQ.
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* @t_port_id: 128-bit target port identifier copied from SRP_LOGIN_REQ.
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*/
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struct srpt_nexus {
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struct rcu_head rcu;
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struct list_head entry;
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struct list_head ch_list;
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u8 i_port_id[16];
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u8 t_port_id[16];
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};
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/**
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* struct srpt_port_attib - attributes for SRPT port
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* @srp_max_rdma_size: Maximum size of SRP RDMA transfers for new connections.
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* @srp_max_rsp_size: Maximum size of SRP response messages in bytes.
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* @srp_sq_size: Shared receive queue (SRQ) size.
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* @use_srq: Whether or not to use SRQ.
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*/
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struct srpt_port_attrib {
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u32 srp_max_rdma_size;
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u32 srp_max_rsp_size;
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u32 srp_sq_size;
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bool use_srq;
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};
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/**
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* struct srpt_port - information associated by SRPT with a single IB port
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* @sdev: backpointer to the HCA information.
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* @mad_agent: per-port management datagram processing information.
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* @enabled: Whether or not this target port is enabled.
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* @port_guid: ASCII representation of Port GUID
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* @port_gid: ASCII representation of Port GID
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* @port: one-based port number.
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* @sm_lid: cached value of the port's sm_lid.
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* @lid: cached value of the port's lid.
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* @gid: cached value of the port's gid.
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* @port_acl_lock spinlock for port_acl_list:
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* @work: work structure for refreshing the aforementioned cached values.
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* @port_guid_tpg: TPG associated with target port GUID.
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* @port_guid_wwn: WWN associated with target port GUID.
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* @port_gid_tpg: TPG associated with target port GID.
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* @port_gid_wwn: WWN associated with target port GID.
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* @port_attrib: Port attributes that can be accessed through configfs.
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* @ch_releaseQ: Enables waiting for removal from nexus_list.
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* @mutex: Protects nexus_list.
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* @nexus_list: Nexus list. See also srpt_nexus.entry.
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*/
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struct srpt_port {
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struct srpt_device *sdev;
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struct ib_mad_agent *mad_agent;
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bool enabled;
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u8 port_guid[24];
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u8 port_gid[64];
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u8 port;
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u32 sm_lid;
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u32 lid;
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union ib_gid gid;
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struct work_struct work;
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struct se_portal_group port_guid_tpg;
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struct se_wwn port_guid_wwn;
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struct se_portal_group port_gid_tpg;
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struct se_wwn port_gid_wwn;
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struct srpt_port_attrib port_attrib;
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wait_queue_head_t ch_releaseQ;
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struct mutex mutex;
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struct list_head nexus_list;
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};
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/**
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* struct srpt_device - information associated by SRPT with a single HCA
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* @device: Backpointer to the struct ib_device managed by the IB core.
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* @pd: IB protection domain.
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* @lkey: L_Key (local key) with write access to all local memory.
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* @srq: Per-HCA SRQ (shared receive queue).
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* @cm_id: Connection identifier.
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* @srq_size: SRQ size.
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* @sdev_mutex: Serializes use_srq changes.
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* @use_srq: Whether or not to use SRQ.
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* @ioctx_ring: Per-HCA SRQ.
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* @event_handler: Per-HCA asynchronous IB event handler.
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* @list: Node in srpt_dev_list.
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* @port: Information about the ports owned by this HCA.
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*/
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struct srpt_device {
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struct ib_device *device;
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struct ib_pd *pd;
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u32 lkey;
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struct ib_srq *srq;
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struct ib_cm_id *cm_id;
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int srq_size;
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struct mutex sdev_mutex;
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bool use_srq;
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struct srpt_recv_ioctx **ioctx_ring;
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struct ib_event_handler event_handler;
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struct list_head list;
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struct srpt_port port[];
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};
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#endif /* IB_SRPT_H */
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