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bb12588a38
This patch adds support for SRP_CRED_REQ to avoid a lockup by targets that use that mechanism to return credits to the initiator. This prevents a lockup observed in the field where we would never add the credits from the SRP_CRED_REQ to our current count, and would therefore never send another command to the target. Minimal support for SRP_AER_REQ is also added, as these messages can also be used to convey additional credits to the initiator. Based upon extensive debugging and code by Bart Van Assche and a bug report by Chris Worley. Signed-off-by: David Dillow <dillowda@ornl.gov> Signed-off-by: Roland Dreier <rolandd@cisco.com>
281 lines
6.1 KiB
C
281 lines
6.1 KiB
C
/*
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* Copyright (c) 2005 Cisco Systems. All rights reserved.
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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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* $Id$
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*/
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#ifndef SCSI_SRP_H
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#define SCSI_SRP_H
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/*
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* Structures and constants for the SCSI RDMA Protocol (SRP) as
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* defined by the INCITS T10 committee. This file was written using
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* draft Revision 16a of the SRP standard.
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*/
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#include <linux/types.h>
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enum {
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SRP_LOGIN_REQ = 0x00,
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SRP_TSK_MGMT = 0x01,
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SRP_CMD = 0x02,
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SRP_I_LOGOUT = 0x03,
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SRP_LOGIN_RSP = 0xc0,
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SRP_RSP = 0xc1,
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SRP_LOGIN_REJ = 0xc2,
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SRP_T_LOGOUT = 0x80,
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SRP_CRED_REQ = 0x81,
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SRP_AER_REQ = 0x82,
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SRP_CRED_RSP = 0x41,
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SRP_AER_RSP = 0x42
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};
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enum {
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SRP_BUF_FORMAT_DIRECT = 1 << 1,
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SRP_BUF_FORMAT_INDIRECT = 1 << 2
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};
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enum {
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SRP_NO_DATA_DESC = 0,
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SRP_DATA_DESC_DIRECT = 1,
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SRP_DATA_DESC_INDIRECT = 2
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};
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enum {
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SRP_TSK_ABORT_TASK = 0x01,
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SRP_TSK_ABORT_TASK_SET = 0x02,
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SRP_TSK_CLEAR_TASK_SET = 0x04,
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SRP_TSK_LUN_RESET = 0x08,
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SRP_TSK_CLEAR_ACA = 0x40
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};
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enum srp_login_rej_reason {
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SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL = 0x00010000,
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SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES = 0x00010001,
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SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE = 0x00010002,
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SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL = 0x00010003,
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SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT = 0x00010004,
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SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED = 0x00010005,
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SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED = 0x00010006
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};
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enum {
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SRP_REV10_IB_IO_CLASS = 0xff00,
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SRP_REV16A_IB_IO_CLASS = 0x0100
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};
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struct srp_direct_buf {
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__be64 va;
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__be32 key;
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__be32 len;
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};
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/*
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* We need the packed attribute because the SRP spec puts the list of
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* descriptors at an offset of 20, which is not aligned to the size of
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* struct srp_direct_buf. The whole structure must be packed to avoid
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* having the 20-byte structure padded to 24 bytes on 64-bit architectures.
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*/
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struct srp_indirect_buf {
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struct srp_direct_buf table_desc;
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__be32 len;
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struct srp_direct_buf desc_list[0];
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} __attribute__((packed));
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enum {
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SRP_MULTICHAN_SINGLE = 0,
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SRP_MULTICHAN_MULTI = 1
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};
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struct srp_login_req {
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u8 opcode;
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u8 reserved1[7];
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u64 tag;
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__be32 req_it_iu_len;
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u8 reserved2[4];
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__be16 req_buf_fmt;
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u8 req_flags;
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u8 reserved3[5];
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u8 initiator_port_id[16];
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u8 target_port_id[16];
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};
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/*
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* The SRP spec defines the size of the LOGIN_RSP structure to be 52
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* bytes, so it needs to be packed to avoid having it padded to 56
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* bytes on 64-bit architectures.
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*/
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struct srp_login_rsp {
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u8 opcode;
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u8 reserved1[3];
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__be32 req_lim_delta;
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u64 tag;
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__be32 max_it_iu_len;
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__be32 max_ti_iu_len;
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__be16 buf_fmt;
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u8 rsp_flags;
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u8 reserved2[25];
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} __attribute__((packed));
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struct srp_login_rej {
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u8 opcode;
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u8 reserved1[3];
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__be32 reason;
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u64 tag;
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u8 reserved2[8];
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__be16 buf_fmt;
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u8 reserved3[6];
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};
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struct srp_i_logout {
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u8 opcode;
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u8 reserved[7];
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u64 tag;
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};
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struct srp_t_logout {
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u8 opcode;
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u8 sol_not;
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u8 reserved[2];
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__be32 reason;
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u64 tag;
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};
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/*
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* We need the packed attribute because the SRP spec only aligns the
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* 8-byte LUN field to 4 bytes.
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*/
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struct srp_tsk_mgmt {
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u8 opcode;
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u8 sol_not;
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u8 reserved1[6];
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u64 tag;
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u8 reserved2[4];
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__be64 lun __attribute__((packed));
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u8 reserved3[2];
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u8 tsk_mgmt_func;
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u8 reserved4;
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u64 task_tag;
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u8 reserved5[8];
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};
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/*
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* We need the packed attribute because the SRP spec only aligns the
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* 8-byte LUN field to 4 bytes.
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*/
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struct srp_cmd {
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u8 opcode;
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u8 sol_not;
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u8 reserved1[3];
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u8 buf_fmt;
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u8 data_out_desc_cnt;
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u8 data_in_desc_cnt;
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u64 tag;
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u8 reserved2[4];
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__be64 lun __attribute__((packed));
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u8 reserved3;
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u8 task_attr;
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u8 reserved4;
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u8 add_cdb_len;
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u8 cdb[16];
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u8 add_data[0];
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};
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enum {
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SRP_RSP_FLAG_RSPVALID = 1 << 0,
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SRP_RSP_FLAG_SNSVALID = 1 << 1,
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SRP_RSP_FLAG_DOOVER = 1 << 2,
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SRP_RSP_FLAG_DOUNDER = 1 << 3,
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SRP_RSP_FLAG_DIOVER = 1 << 4,
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SRP_RSP_FLAG_DIUNDER = 1 << 5
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};
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/*
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* The SRP spec defines the size of the RSP structure to be 36 bytes,
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* so it needs to be packed to avoid having it padded to 40 bytes on
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* 64-bit architectures.
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*/
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struct srp_rsp {
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u8 opcode;
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u8 sol_not;
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u8 reserved1[2];
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__be32 req_lim_delta;
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u64 tag;
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u8 reserved2[2];
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u8 flags;
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u8 status;
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__be32 data_out_res_cnt;
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__be32 data_in_res_cnt;
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__be32 sense_data_len;
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__be32 resp_data_len;
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u8 data[0];
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} __attribute__((packed));
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struct srp_cred_req {
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u8 opcode;
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u8 sol_not;
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u8 reserved[2];
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__be32 req_lim_delta;
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u64 tag;
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};
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struct srp_cred_rsp {
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u8 opcode;
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u8 reserved[7];
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u64 tag;
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};
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/*
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* The SRP spec defines the fixed portion of the AER_REQ structure to be
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* 36 bytes, so it needs to be packed to avoid having it padded to 40 bytes
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* on 64-bit architectures.
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*/
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struct srp_aer_req {
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u8 opcode;
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u8 sol_not;
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u8 reserved[2];
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__be32 req_lim_delta;
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u64 tag;
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u32 reserved2;
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__be64 lun;
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__be32 sense_data_len;
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u32 reserved3;
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u8 sense_data[0];
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} __attribute__((packed));
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struct srp_aer_rsp {
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u8 opcode;
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u8 reserved[7];
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u64 tag;
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};
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#endif /* SCSI_SRP_H */
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