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Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=072b91... Commit: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 Parent: 39120e11705782c77d3a47d7d2927676fd8e3aaa Author: Brian King <brking@linux.vnet.ibm.com> AuthorDate: Tue Jul 1 13:14:30 2008 -0500 Committer: James Bottomley <James.Bottomley@HansenPartnership.com> CommitDate: Sat Jul 12 08:22:32 2008 -0500 [SCSI] ibmvfc: IBM Power Virtual Fibre Channel Adapter Client Driver This patch adds a new device driver to support the Virtual Fibre Channel interface on IBM Power based servers. The Virtual I/O Server on IBM Power servers utilizes N-Port ID Virtualization to export a Virtual Fibre Channel adapter to the client. This driver is the client device driver. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> --- drivers/scsi/Kconfig | 19 + drivers/scsi/Makefile | 1 + drivers/scsi/ibmvscsi/Makefile | 1 + drivers/scsi/ibmvscsi/ibmvfc.c | 3910 ++++++++++++++++++++++++++++++++++++++++ drivers/scsi/ibmvscsi/ibmvfc.h | 682 +++++++ 5 files changed, 4613 insertions(+), 0 deletions(-) diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index 994943f..26be540 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -888,6 +888,25 @@ config SCSI_IBMVSCSIS To compile this driver as a module, choose M here: the module will be called ibmvstgt. +config SCSI_IBMVFC + tristate "IBM Virtual FC support" + depends on PPC_PSERIES && SCSI + select SCSI_FC_ATTRS + help + This is the IBM POWER Virtual FC Client + + To compile this driver as a module, choose M here: the + module will be called ibmvfc. + +config SCSI_IBMVFC_TRACE + bool "enable driver internal trace" + depends on SCSI_IBMVFC + default y + help + If you say Y here, the driver will trace all commands issued + to the adapter. Performance impact is minimal. Trace can be + dumped using /sys/class/scsi_host/hostXX/trace. + config SCSI_INITIO tristate "Initio 9100U(W) support" depends on PCI && SCSI diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index aa8272e..a814967 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -119,6 +119,7 @@ obj-$(CONFIG_SCSI_IPR) += ipr.o obj-$(CONFIG_SCSI_SRP) += libsrp.o obj-$(CONFIG_SCSI_IBMVSCSI) += ibmvscsi/ obj-$(CONFIG_SCSI_IBMVSCSIS) += ibmvscsi/ +obj-$(CONFIG_SCSI_IBMVFC) += ibmvscsi/ obj-$(CONFIG_SCSI_HPTIOP) += hptiop.o obj-$(CONFIG_SCSI_STEX) += stex.o obj-$(CONFIG_SCSI_MVSAS) += mvsas.o diff --git a/drivers/scsi/ibmvscsi/Makefile b/drivers/scsi/ibmvscsi/Makefile index 6ac0633..a423d96 100644 --- a/drivers/scsi/ibmvscsi/Makefile +++ b/drivers/scsi/ibmvscsi/Makefile @@ -5,3 +5,4 @@ ibmvscsic-$(CONFIG_PPC_ISERIES) += iseries_vscsi.o ibmvscsic-$(CONFIG_PPC_PSERIES) += rpa_vscsi.o obj-$(CONFIG_SCSI_IBMVSCSIS) += ibmvstgt.o +obj-$(CONFIG_SCSI_IBMVFC) += ibmvfc.o diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c new file mode 100644 index 0000000..eb702b9 --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvfc.c @@ -0,0 +1,3910 @@ +/* + * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter + * + * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation + * + * Copyright (C) IBM Corporation, 2008 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/kthread.h> +#include <linux/of.h> +#include <linux/stringify.h> +#include <asm/firmware.h> +#include <asm/irq.h> +#include <asm/vio.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_transport_fc.h> +#include "ibmvfc.h" + +static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT; +static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT; +static unsigned int max_lun = IBMVFC_MAX_LUN; +static unsigned int max_targets = IBMVFC_MAX_TARGETS; +static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT; +static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS; +static unsigned int dev_loss_tmo = IBMVFC_DEV_LOSS_TMO; +static unsigned int ibmvfc_debug = IBMVFC_DEBUG; +static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL; +static LIST_HEAD(ibmvfc_head); +static DEFINE_SPINLOCK(ibmvfc_driver_lock); +static struct scsi_transport_template *ibmvfc_transport_template; + +MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver"); +MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(IBMVFC_DRIVER_VERSION); + +module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. " + "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]"); +module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(default_timeout, + "Default timeout in seconds for initialization and EH commands. " + "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]"); +module_param_named(max_requests, max_requests, uint, S_IRUGO); +MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. " + "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]"); +module_param_named(max_lun, max_lun, uint, S_IRUGO); +MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. " + "[Default=" __stringify(IBMVFC_MAX_LUN) "]"); +module_param_named(max_targets, max_targets, uint, S_IRUGO); +MODULE_PARM_DESC(max_targets, "Maximum allowed targets. " + "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]"); +module_param_named(disc_threads, disc_threads, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. " + "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]"); +module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug, "Enable driver debug information. " + "[Default=" __stringify(IBMVFC_DEBUG) "]"); +module_param_named(dev_loss_tmo, dev_loss_tmo, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(dev_loss_tmo, "Maximum number of seconds that the FC " + "transport should insulate the loss of a remote port. Once this " + "value is exceeded, the scsi target is removed. " + "[Default=" __stringify(IBMVFC_DEV_LOSS_TMO) "]"); +module_param_named(log_level, log_level, uint, 0); +MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. " + "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]"); + +static const struct { + u16 status; + u16 error; + u8 result; + u8 retry; + int log; + char *name; +} cmd_status [] = { + { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_NO_CONNECT, 1, 1, "network down" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 0, 0, "link halted" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" }, + + { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ABORT, 0, 1, "invalid parameter" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ABORT, 0, 1, "missing parameter" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ABORT, 0, 1, "transaction cancelled" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ABORT, 0, 1, "transaction cancelled implicit" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" }, + + { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" }, + { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" }, + { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" }, + { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" }, + { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" }, + { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" }, + { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" }, + { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" }, + { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" }, + { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" }, + { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" }, + + { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" }, +}; + +static void ibmvfc_npiv_login(struct ibmvfc_host *); +static void ibmvfc_tgt_send_prli(struct ibmvfc_target *); +static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *); +static void ibmvfc_tgt_query_target(struct ibmvfc_target *); + +static const char *unknown_error = "unknown error"; + +#ifdef CONFIG_SCSI_IBMVFC_TRACE +/** + * ibmvfc_trc_start - Log a start trace entry + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_trc_start(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; + struct ibmvfc_mad_common *mad = &evt->iu.mad_common; + struct ibmvfc_trace_entry *entry; + + entry = &vhost->trace[vhost->trace_index++]; + entry->evt = evt; + entry->time = jiffies; + entry->fmt = evt->crq.format; + entry->type = IBMVFC_TRC_START; + + switch (entry->fmt) { + case IBMVFC_CMD_FORMAT: + entry->op_code = vfc_cmd->iu.cdb[0]; + entry->scsi_id = vfc_cmd->tgt_scsi_id; + entry->lun = scsilun_to_int(&vfc_cmd->iu.lun); + entry->tmf_flags = vfc_cmd->iu.tmf_flags; + entry->u.start.xfer_len = vfc_cmd->iu.xfer_len; + break; + case IBMVFC_MAD_FORMAT: + entry->op_code = mad->opcode; + break; + default: + break; + }; +} + +/** + * ibmvfc_trc_end - Log an end trace entry + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_trc_end(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; + struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common; + struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++]; + + entry->evt = evt; + entry->time = jiffies; + entry->fmt = evt->crq.format; + entry->type = IBMVFC_TRC_END; + + switch (entry->fmt) { + case IBMVFC_CMD_FORMAT: + entry->op_code = vfc_cmd->iu.cdb[0]; + entry->scsi_id = vfc_cmd->tgt_scsi_id; + entry->lun = scsilun_to_int(&vfc_cmd->iu.lun); + entry->tmf_flags = vfc_cmd->iu.tmf_flags; + entry->u.end.status = vfc_cmd->status; + entry->u.end.error = vfc_cmd->error; + entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags; + entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code; + entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status; + break; + case IBMVFC_MAD_FORMAT: + entry->op_code = mad->opcode; + entry->u.end.status = mad->status; + break; + default: + break; + + }; +} + +#else +#define ibmvfc_trc_start(evt) do { } while (0) +#define ibmvfc_trc_end(evt) do { } while (0) +#endif + +/** + * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response + * @status: status / error class + * @error: error + * + * Return value: + * index into cmd_status / -EINVAL on failure + **/ +static int ibmvfc_get_err_index(u16 status, u16 error) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(cmd_status); i++) + if ((cmd_status[i].status & status) == cmd_status[i].status && + cmd_status[i].error == error) + return i; + + return -EINVAL; +} + +/** + * ibmvfc_get_cmd_error - Find the error description for the fcp response + * @status: status / error class + * @error: error + * + * Return value: + * error description string + **/ +static const char *ibmvfc_get_cmd_error(u16 status, u16 error) +{ + int rc = ibmvfc_get_err_index(status, error); + if (rc >= 0) + return cmd_status[rc].name; + return unknown_error; +} + +/** + * ibmvfc_get_err_result - Find the scsi status to return for the fcp response + * @vfc_cmd: ibmvfc command struct + * + * Return value: + * SCSI result value to return for completed command + **/ +static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd) +{ + int err; + struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; + int fc_rsp_len = rsp->fcp_rsp_len; + + if ((rsp->flags & FCP_RSP_LEN_VALID) && + ((!fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) || + rsp->data.info.rsp_code)) + return DID_ERROR << 16; + + if (!vfc_cmd->status) { + if (rsp->flags & FCP_RESID_OVER) + return rsp->scsi_status | (DID_ERROR << 16); + else + return rsp->scsi_status | (DID_OK << 16); + } + + err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error); + if (err >= 0) + return rsp->scsi_status | (cmd_status[err].result << 16); + return rsp->scsi_status | (DID_ERROR << 16); +} + +/** + * ibmvfc_retry_cmd - Determine if error status is retryable + * @status: status / error class + * @error: error + * + * Return value: + * 1 if error should be retried / 0 if it should not + **/ +static int ibmvfc_retry_cmd(u16 status, u16 error) +{ + int rc = ibmvfc_get_err_index(status, error); + + if (rc >= 0) + return cmd_status[rc].retry; + return 1; +} + +static const char *unknown_fc_explain = "unknown fc explain"; + +static const struct { + u16 fc_explain; + char *name; +} ls_explain [] = { + { 0x00, "no additional explanation" }, + { 0x01, "service parameter error - options" }, + { 0x03, "service parameter error - initiator control" }, + { 0x05, "service parameter error - recipient control" }, + { 0x07, "service parameter error - received data field size" }, + { 0x09, "service parameter error - concurrent seq" }, + { 0x0B, "service parameter error - credit" }, + { 0x0D, "invalid N_Port/F_Port_Name" }, + { 0x0E, "invalid node/Fabric Name" }, + { 0x0F, "invalid common service parameters" }, + { 0x11, "invalid association header" }, + { 0x13, "association header required" }, + { 0x15, "invalid originator S_ID" }, + { 0x17, "invalid OX_ID-RX-ID combination" }, + { 0x19, "command (request) already in progress" }, + { 0x1E, "N_Port Login requested" }, + { 0x1F, "Invalid N_Port_ID" }, +}; + +static const struct { + u16 fc_explain; + char *name; +} gs_explain [] = { + { 0x00, "no additional explanation" }, + { 0x01, "port identifier not registered" }, + { 0x02, "port name not registered" }, + { 0x03, "node name not registered" }, + { 0x04, "class of service not registered" }, + { 0x06, "initial process associator not registered" }, + { 0x07, "FC-4 TYPEs not registered" }, + { 0x08, "symbolic port name not registered" }, + { 0x09, "symbolic node name not registered" }, + { 0x0A, "port type not registered" }, + { 0xF0, "authorization exception" }, + { 0xF1, "authentication exception" }, + { 0xF2, "data base full" }, + { 0xF3, "data base empty" }, + { 0xF4, "processing request" }, + { 0xF5, "unable to verify connection" }, + { 0xF6, "devices not in a common zone" }, +}; + +/** + * ibmvfc_get_ls_explain - Return the FC Explain description text + * @status: FC Explain status + * + * Returns: + * error string + **/ +static const char *ibmvfc_get_ls_explain(u16 status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ls_explain); i++) + if (ls_explain[i].fc_explain == status) + return ls_explain[i].name; + + return unknown_fc_explain; +} + +/** + * ibmvfc_get_gs_explain - Return the FC Explain description text + * @status: FC Explain status + * + * Returns: + * error string + **/ +static const char *ibmvfc_get_gs_explain(u16 status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(gs_explain); i++) + if (gs_explain[i].fc_explain == status) + return gs_explain[i].name; + + return unknown_fc_explain; +} + +static const struct { + enum ibmvfc_fc_type fc_type; + char *name; +} fc_type [] = { + { IBMVFC_FABRIC_REJECT, "fabric reject" }, + { IBMVFC_PORT_REJECT, "port reject" }, + { IBMVFC_LS_REJECT, "ELS reject" }, + { IBMVFC_FABRIC_BUSY, "fabric busy" }, + { IBMVFC_PORT_BUSY, "port busy" }, + { IBMVFC_BASIC_REJECT, "basic reject" }, +}; + +static const char *unknown_fc_type = "unknown fc type"; + +/** + * ibmvfc_get_fc_type - Return the FC Type description text + * @status: FC Type error status + * + * Returns: + * error string + **/ +static const char *ibmvfc_get_fc_type(u16 status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(fc_type); i++) + if (fc_type[i].fc_type == status) + return fc_type[i].name; + + return unknown_fc_type; +} + +/** + * ibmvfc_set_tgt_action - Set the next init action for the target + * @tgt: ibmvfc target struct + * @action: action to perform + * + **/ +static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt, + enum ibmvfc_target_action action) +{ + switch (tgt->action) { + case IBMVFC_TGT_ACTION_DEL_RPORT: + break; + default: + tgt->action = action; + break; + } +} + +/** + * ibmvfc_set_host_state - Set the state for the host + * @vhost: ibmvfc host struct + * @state: state to set host to + * + * Returns: + * 0 if state changed / non-zero if not changed + **/ +static int ibmvfc_set_host_state(struct ibmvfc_host *vhost, + enum ibmvfc_host_state state) +{ + int rc = 0; + + switch (vhost->state) { + case IBMVFC_HOST_OFFLINE: + rc = -EINVAL; + break; + default: + vhost->state = state; + break; + }; + + return rc; +} + +/** + * ibmvfc_set_host_action - Set the next init action for the host + * @vhost: ibmvfc host struct + * @action: action to perform + * + **/ +static void ibmvfc_set_host_action(struct ibmvfc_host *vhost, + enum ibmvfc_host_action action) +{ + switch (action) { + case IBMVFC_HOST_ACTION_ALLOC_TGTS: + if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_INIT_WAIT: + if (vhost->action == IBMVFC_HOST_ACTION_INIT) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_QUERY: + switch (vhost->action) { + case IBMVFC_HOST_ACTION_INIT_WAIT: + case IBMVFC_HOST_ACTION_NONE: + case IBMVFC_HOST_ACTION_TGT_ADD: + vhost->action = action; + break; + default: + break; + }; + break; + case IBMVFC_HOST_ACTION_TGT_INIT: + if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_INIT: + case IBMVFC_HOST_ACTION_TGT_DEL: + case IBMVFC_HOST_ACTION_QUERY_TGTS: + case IBMVFC_HOST_ACTION_TGT_ADD: + case IBMVFC_HOST_ACTION_NONE: + default: + vhost->action = action; + break; + }; +} + +/** + * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login) + * @vhost: ibmvfc host struct + * + * Return value: + * nothing + **/ +static void ibmvfc_reinit_host(struct ibmvfc_host *vhost) +{ + if (vhost->action == IBMVFC_HOST_ACTION_NONE) { + scsi_block_requests(vhost->host); + ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); + } else + vhost->reinit = 1; + + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_link_down - Handle a link down event from the adapter + * @vhost: ibmvfc host struct + * @state: ibmvfc host state to enter + * + **/ +static void ibmvfc_link_down(struct ibmvfc_host *vhost, + enum ibmvfc_host_state state) +{ + struct ibmvfc_target *tgt; + + ENTER; + scsi_block_requests(vhost->host); + list_for_each_entry(tgt, &vhost->targets, queue) + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + ibmvfc_set_host_state(vhost, state); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); + vhost->events_to_log |= IBMVFC_AE_LINKDOWN; + wake_up(&vhost->work_wait_q); + LEAVE; +} + +/** + * ibmvfc_init_host - Start host initialization + * @vhost: ibmvfc host struct + * + * Return value: + * nothing + **/ +static void ibmvfc_init_host(struct ibmvfc_host *vhost) +{ + struct ibmvfc_target *tgt; + + if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { + if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) { + dev_err(vhost->dev, + "Host initialization retries exceeded. Taking adapter offline\n"); + ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); + return; + } + } + + if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { + list_for_each_entry(tgt, &vhost->targets, queue) + tgt->need_login = 1; + scsi_block_requests(vhost->host); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); + vhost->job_step = ibmvfc_npiv_login; + wake_up(&vhost->work_wait_q); + } +} + +/** + * ibmvfc_send_crq - Send a CRQ + * @vhost: ibmvfc host struct + * @word1: the first 64 bits of the data + * @word2: the second 64 bits of the data + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2) +{ + struct vio_dev *vdev = to_vio_dev(vhost->dev); + return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); +} + +/** + * ibmvfc_send_crq_init - Send a CRQ init message + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost) +{ + ibmvfc_dbg(vhost, "Sending CRQ init\n"); + return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0); +} + +/** + * ibmvfc_send_crq_init_complete - Send a CRQ init complete message + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost) +{ + ibmvfc_dbg(vhost, "Sending CRQ init complete\n"); + return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0); +} + +/** + * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ + * @vhost: ibmvfc host struct + * + * Frees irq, deallocates a page for messages, unmaps dma, and unregisters + * the crq with the hypervisor. + **/ +static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost) +{ + long rc; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + struct ibmvfc_crq_queue *crq = &vhost->crq; + + ibmvfc_dbg(vhost, "Releasing CRQ\n"); + free_irq(vdev->irq, vhost); + do { + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); + + vhost->state = IBMVFC_NO_CRQ; + dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); + free_page((unsigned long)crq->msgs); +} + +/** + * ibmvfc_reenable_crq_queue - reenables the CRQ + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost) +{ + int rc; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + + /* Re-enable the CRQ */ + do { + rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); + } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); + + if (rc) + dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc); + + return rc; +} + +/** + * ibmvfc_reset_crq - resets a crq after a failure + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_reset_crq(struct ibmvfc_host *vhost) +{ + int rc; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + struct ibmvfc_crq_queue *crq = &vhost->crq; + + /* Close the CRQ */ + do { + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); + + vhost->state = IBMVFC_NO_CRQ; + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); + + /* Clean out the queue */ + memset(crq->msgs, 0, PAGE_SIZE); + crq->cur = 0; + + /* And re-open it again */ + rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, + crq->msg_token, PAGE_SIZE); + + if (rc == H_CLOSED) + /* Adapter is good, but other end is not ready */ + dev_warn(vhost->dev, "Partner adapter not ready\n"); + else if (rc != 0) + dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc); + + return rc; +} + +/** + * ibmvfc_valid_event - Determines if event is valid. + * @pool: event_pool that contains the event + * @evt: ibmvfc event to be checked for validity + * + * Return value: + * 1 if event is valid / 0 if event is not valid + **/ +static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool, + struct ibmvfc_event *evt) +{ + int index = evt - pool->events; + if (index < 0 || index >= pool->size) /* outside of bounds */ + return 0; + if (evt != pool->events + index) /* unaligned */ + return 0; + return 1; +} + +/** + * ibmvfc_free_event - Free the specified event + * @evt: ibmvfc_event to be freed + * + **/ +static void ibmvfc_free_event(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_event_pool *pool = &vhost->pool; + + BUG_ON(!ibmvfc_valid_event(pool, evt)); + BUG_ON(atomic_inc_return(&evt->free) != 1); + list_add_tail(&evt->queue, &vhost->free); +} + +/** + * ibmvfc_scsi_eh_done - EH done function for queuecommand commands + * @evt: ibmvfc event struct + * + * This function does not setup any error status, that must be done + * before this function gets called. + **/ +static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt) +{ + struct scsi_cmnd *cmnd = evt->cmnd; + + if (cmnd) { + scsi_dma_unmap(cmnd); + cmnd->scsi_done(cmnd); + } + + ibmvfc_free_event(evt); +} + +/** + * ibmvfc_fail_request - Fail request with specified error code + * @evt: ibmvfc event struct + * @error_code: error code to fail request with + * + * Return value: + * none + **/ +static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code) +{ + if (evt->cmnd) { + evt->cmnd->result = (error_code << 16); + evt->done = ibmvfc_scsi_eh_done; + } else + evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED; + + list_del(&evt->queue); + del_timer(&evt->timer); + ibmvfc_trc_end(evt); + evt->done(evt); +} + +/** + * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests + * @vhost: ibmvfc host struct + * @error_code: error code to fail requests with + * + * Return value: + * none + **/ +static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code) +{ + struct ibmvfc_event *evt, *pos; + + ibmvfc_dbg(vhost, "Purging all requests\n"); + list_for_each_entry_safe(evt, pos, &vhost->sent, queue) + ibmvfc_fail_request(evt, error_code); +} + +/** + * __ibmvfc_reset_host - Reset the connection to the server (no locking) + * @vhost: struct ibmvfc host to reset + **/ +static void __ibmvfc_reset_host(struct ibmvfc_host *vhost) +{ + int rc; + + scsi_block_requests(vhost->host); + ibmvfc_purge_requests(vhost, DID_ERROR); + if ((rc = ibmvfc_reset_crq(vhost)) || + (rc = ibmvfc_send_crq_init(vhost)) || + (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) { + dev_err(vhost->dev, "Error after reset rc=%d\n", rc); + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + } else + ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); +} + +/** + * ibmvfc_reset_host - Reset the connection to the server + * @vhost: struct ibmvfc host to reset + **/ +static void ibmvfc_reset_host(struct ibmvfc_host *vhost) +{ + unsigned long flags; + + spin_lock_irqsave(vhost->host->host_lock, flags); + __ibmvfc_reset_host(vhost); + spin_unlock_irqrestore(vhost->host->host_lock, flags); +} + +/** + * ibmvfc_retry_host_init - Retry host initialization if allowed + * @vhost: ibmvfc host struct + * + **/ +static void ibmvfc_retry_host_init(struct ibmvfc_host *vhost) +{ + if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { + if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) { + dev_err(vhost->dev, + "Host initialization retries exceeded. Taking adapter offline\n"); + ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); + } else if (vhost->init_retries == IBMVFC_MAX_INIT_RETRIES) + __ibmvfc_reset_host(vhost); + else + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); + } + + wake_up(&vhost->work_wait_q); +} + +/** + * __ibmvfc_find_target - Find the specified scsi_target (no locking) + * @starget: scsi target struct + * + * Return value: + * ibmvfc_target struct / NULL if not found + **/ +static struct ibmvfc_target *__ibmvfc_find_target(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct ibmvfc_host *vhost = shost_priv(shost); + struct ibmvfc_target *tgt; + + list_for_each_entry(tgt, &vhost->targets, queue) + if (tgt->target_id == starget->id) + return tgt; + return NULL; +} + +/** + * ibmvfc_find_target - Find the specified scsi_target + * @starget: scsi target struct + * + * Return value: + * ibmvfc_target struct / NULL if not found + **/ +static struct ibmvfc_target *ibmvfc_find_target(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct ibmvfc_target *tgt; + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + tgt = __ibmvfc_find_target(starget); + spin_unlock_irqrestore(shost->host_lock, flags); + return tgt; +} + +/** + * ibmvfc_get_host_speed - Get host port speed + * @shost: scsi host struct + * + * Return value: + * none + **/ +static void ibmvfc_get_host_speed(struct Scsi_Host *shost) +{ + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + if (vhost->state == IBMVFC_ACTIVE) { + switch (vhost->login_buf->resp.link_speed / 100) { + case 1: + fc_host_speed(shost) = FC_PORTSPEED_1GBIT; + break; + case 2: + fc_host_speed(shost) = FC_PORTSPEED_2GBIT; + break; + case 4: + fc_host_speed(shost) = FC_PORTSPEED_4GBIT; + break; + case 8: + fc_host_speed(shost) = FC_PORTSPEED_8GBIT; + break; + case 10: + fc_host_speed(shost) = FC_PORTSPEED_10GBIT; + break; + case 16: + fc_host_speed(shost) = FC_PORTSPEED_16GBIT; + break; + default: + ibmvfc_log(vhost, 3, "Unknown port speed: %ld Gbit\n", + vhost->login_buf->resp.link_speed / 100); + fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; + break; + } + } else + fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; + spin_unlock_irqrestore(shost->host_lock, flags); +} + +/** + * ibmvfc_get_host_port_state - Get host port state + * @shost: scsi host struct + * + * Return value: + * none + **/ +static void ibmvfc_get_host_port_state(struct Scsi_Host *shost) +{ + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + switch (vhost->state) { + case IBMVFC_INITIALIZING: + case IBMVFC_ACTIVE: + fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; + break; + case IBMVFC_LINK_DOWN: + fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; + break; + case IBMVFC_LINK_DEAD: + case IBMVFC_HOST_OFFLINE: + fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; + break; + case IBMVFC_HALTED: + fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED; + break; + default: + ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state); + fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; + break; + } + spin_unlock_irqrestore(shost->host_lock, flags); +} + +/** + * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout + * @rport: rport struct + * @timeout: timeout value + * + * Return value: + * none + **/ +static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) +{ + if (timeout) + rport->dev_loss_tmo = timeout; + else + rport->dev_loss_tmo = 1; +} + +/** + * ibmvfc_get_starget_node_name - Get SCSI target's node name + * @starget: scsi target struct + * + * Return value: + * none + **/ +static void ibmvfc_get_starget_node_name(struct scsi_target *starget) +{ + struct ibmvfc_target *tgt = ibmvfc_find_target(starget); + fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0; +} + +/** + * ibmvfc_get_starget_port_name - Get SCSI target's port name + * @starget: scsi target struct + * + * Return value: + * none + **/ +static void ibmvfc_get_starget_port_name(struct scsi_target *starget) +{ + struct ibmvfc_target *tgt = ibmvfc_find_target(starget); + fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0; +} + +/** + * ibmvfc_get_starget_port_id - Get SCSI target's port ID + * @starget: scsi target struct + * + * Return value: + * none + **/ +static void ibmvfc_get_starget_port_id(struct scsi_target *starget) +{ + struct ibmvfc_target *tgt = ibmvfc_find_target(starget); + fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1; +} + +/** + * ibmvfc_wait_while_resetting - Wait while the host resets + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost) +{ + long timeout = wait_event_timeout(vhost->init_wait_q, + (vhost->state == IBMVFC_ACTIVE || + vhost->state == IBMVFC_HOST_OFFLINE || + vhost->state == IBMVFC_LINK_DEAD), + (init_timeout * HZ)); + + return timeout ? 0 : -EIO; +} + +/** + * ibmvfc_issue_fc_host_lip - Re-initiate link initialization + * @shost: scsi host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost) +{ + struct ibmvfc_host *vhost = shost_priv(shost); + + dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n"); + ibmvfc_reset_host(vhost); + return ibmvfc_wait_while_resetting(vhost); +} + +/** + * ibmvfc_gather_partition_info - Gather info about the LPAR + * + * Return value: + * none + **/ +static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost) +{ + struct device_node *rootdn; + const char *name; + const unsigned int *num; + + rootdn = of_find_node_by_path("/"); + if (!rootdn) + return; + + name = of_get_property(rootdn, "ibm,partition-name", NULL); + if (name) + strncpy(vhost->partition_name, name, sizeof(vhost->partition_name)); + num = of_get_property(rootdn, "ibm,partition-no", NULL); + if (num) + vhost->partition_number = *num; + of_node_put(rootdn); +} + +/** + * ibmvfc_set_login_info - Setup info for NPIV login + * @vhost: ibmvfc host struct + * + * Return value: + * none + **/ +static void ibmvfc_set_login_info(struct ibmvfc_host *vhost) +{ + struct ibmvfc_npiv_login *login_info = &vhost->login_info; + struct device_node *of_node = vhost->dev->archdata.of_node; + const char *location; + + memset(login_info, 0, sizeof(*login_info)); + + login_info->ostype = IBMVFC_OS_LINUX; + login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9; + login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu); + login_info->max_response = sizeof(struct ibmvfc_fcp_rsp); + login_info->partition_num = vhost->partition_number; + login_info->vfc_frame_version = 1; + login_info->fcp_version = 3; + if (vhost->client_migrated) + login_info->flags = IBMVFC_CLIENT_MIGRATED; + + login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ; + login_info->capabilities = IBMVFC_CAN_MIGRATE; + login_info->async.va = vhost->async_crq.msg_token; + login_info->async.len = vhost->async_crq.size; + strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME); + strncpy(login_info->device_name, + vhost->host->shost_gendev.bus_id, IBMVFC_MAX_NAME); + + location = of_get_property(of_node, "ibm,loc-code", NULL); + location = location ? location : vhost->dev->bus_id; + strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME); +} + +/** + * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host + * @vhost: ibmvfc host who owns the event pool + * + * Returns zero on success. + **/ +static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost) +{ + int i; + struct ibmvfc_event_pool *pool = &vhost->pool; + + ENTER; + pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ; + pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); + if (!pool->events) + return -ENOMEM; + + pool->iu_storage = dma_alloc_coherent(vhost->dev, + pool->size * sizeof(*pool->iu_storage), + &pool->iu_token, 0); + + if (!pool->iu_storage) { + kfree(pool->events); + return -ENOMEM; + } + + for (i = 0; i < pool->size; ++i) { + struct ibmvfc_event *evt = &pool->events[i]; + atomic_set(&evt->free, 1); + evt->crq.valid = 0x80; + evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i); + evt->xfer_iu = pool->iu_storage + i; + evt->vhost = vhost; + evt->ext_list = NULL; + list_add_tail(&evt->queue, &vhost->free); + } + + LEAVE; + return 0; +} + +/** + * ibmvfc_free_event_pool - Frees memory of the event pool of a host + * @vhost: ibmvfc host who owns the event pool + * + **/ +static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost) +{ + int i; + struct ibmvfc_event_pool *pool = &vhost->pool; + + ENTER; + for (i = 0; i < pool->size; ++i) { + list_del(&pool->events[i].queue); + BUG_ON(atomic_read(&pool->events[i].free) != 1); + if (pool->events[i].ext_list) + dma_pool_free(vhost->sg_pool, + pool->events[i].ext_list, + pool->events[i].ext_list_token); + } + + kfree(pool->events); + dma_free_coherent(vhost->dev, + pool->size * sizeof(*pool->iu_storage), + pool->iu_storage, pool->iu_token); + LEAVE; +} + +/** + * ibmvfc_get_event - Gets the next free event in pool + * @vhost: ibmvfc host struct + * + * Returns a free event from the pool. + **/ +static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost) +{ + struct ibmvfc_event *evt; + + BUG_ON(list_empty(&vhost->free)); + evt = list_entry(vhost->free.next, struct ibmvfc_event, queue); + atomic_set(&evt->free, 0); + list_del(&evt->queue); + return evt; +} + +/** + * ibmvfc_init_event - Initialize fields in an event struct that are always + * required. + * @evt: The event + * @done: Routine to call when the event is responded to + * @format: SRP or MAD format + **/ +static void ibmvfc_init_event(struct ibmvfc_event *evt, + void (*done) (struct ibmvfc_event *), u8 format) +{ + evt->cmnd = NULL; + evt->sync_iu = NULL; + evt->crq.format = format; + evt->done = done; +} + +/** + * ibmvfc_map_sg_list - Initialize scatterlist + * @scmd: scsi command struct + * @nseg: number of scatterlist segments + * @md: memory descriptor list to initialize + **/ +static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg, + struct srp_direct_buf *md) +{ + int i; + struct scatterlist *sg; + + scsi_for_each_sg(scmd, sg, nseg, i) { + md[i].va = sg_dma_address(sg); + md[i].len = sg_dma_len(sg); + md[i].key = 0; + } +} + +/** + * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields + * @scmd: Scsi_Cmnd with the scatterlist + * @evt: ibmvfc event struct + * @vfc_cmd: vfc_cmd that contains the memory descriptor + * @dev: device for which to map dma memory + * + * Returns: + * 0 on success / non-zero on failure + **/ +static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd, + struct ibmvfc_event *evt, + struct ibmvfc_cmd *vfc_cmd, struct device *dev) +{ + + int sg_mapped; + struct srp_direct_buf *data = &vfc_cmd->ioba; + struct ibmvfc_host *vhost = dev_get_drvdata(dev); + + sg_mapped = scsi_dma_map(scmd); + if (!sg_mapped) { + vfc_cmd->flags |= IBMVFC_NO_MEM_DESC; + return 0; + } else if (unlikely(sg_mapped < 0)) { + if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) + scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n"); + return sg_mapped; + } + + if (scmd->sc_data_direction == DMA_TO_DEVICE) { + vfc_cmd->flags |= IBMVFC_WRITE; + vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA; + } else { + vfc_cmd->flags |= IBMVFC_READ; + vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA; + } + + if (sg_mapped == 1) { + ibmvfc_map_sg_list(scmd, sg_mapped, data); + return 0; + } + + vfc_cmd->flags |= IBMVFC_SCATTERLIST; + + if (!evt->ext_list) { + evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC, + &evt->ext_list_token); + + if (!evt->ext_list) { + scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n"); + return -ENOMEM; + } + } + + ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list); + + data->va = evt->ext_list_token; + data->len = sg_mapped * sizeof(struct srp_direct_buf); + data->key = 0; + return 0; +} + +/** + * ibmvfc_timeout - Internal command timeout handler + * @evt: struct ibmvfc_event that timed out + * + * Called when an internally generated command times out + **/ +static void ibmvfc_timeout(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt); + ibmvfc_reset_host(vhost); +} + +/** + * ibmvfc_send_event - Transforms event to u64 array and calls send_crq() + * @evt: event to be sent + * @vhost: ibmvfc host struct + * @timeout: timeout in seconds - 0 means do not time command + * + * Returns the value returned from ibmvfc_send_crq(). (Zero for success) + **/ +static int ibmvfc_send_event(struct ibmvfc_event *evt, + struct ibmvfc_host *vhost, unsigned long timeout) +{ + u64 *crq_as_u64 = (u64 *) &evt->crq; + int rc; + + /* Copy the IU into the transfer area */ + *evt->xfer_iu = evt->iu; + if (evt->crq.format == IBMVFC_CMD_FORMAT) + evt->xfer_iu->cmd.tag = (u64)evt; + else if (evt->crq.format == IBMVFC_MAD_FORMAT) + evt->xfer_iu->mad_common.tag = (u64)evt; + else + BUG(); + + list_add_tail(&evt->queue, &vhost->sent); + init_timer(&evt->timer); + + if (timeout) { + evt->timer.data = (unsigned long) evt; + evt->timer.expires = jiffies + (timeout * HZ); + evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout; + add_timer(&evt->timer); + } + + if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) { + list_del(&evt->queue); + del_timer(&evt->timer); + + /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. + * Firmware will send a CRQ with a transport event (0xFF) to + * tell this client what has happened to the transport. This + * will be handled in ibmvfc_handle_crq() + */ + if (rc == H_CLOSED) { + if (printk_ratelimit()) + dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n"); + if (evt->cmnd) + scsi_dma_unmap(evt->cmnd); + ibmvfc_free_event(evt); + return SCSI_MLQUEUE_HOST_BUSY; + } + + dev_err(vhost->dev, "Send error (rc=%d)\n", rc); + if (evt->cmnd) { + evt->cmnd->result = DID_ERROR << 16; + evt->done = ibmvfc_scsi_eh_done; + } else + evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR; + + evt->done(evt); + } else + ibmvfc_trc_start(evt); + + return 0; +} + +/** + * ibmvfc_log_error - Log an error for the failed command if appropriate + * @evt: ibmvfc event to log + * + **/ +static void ibmvfc_log_error(struct ibmvfc_event *evt) +{ + struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; + struct scsi_cmnd *cmnd = evt->cmnd; + const char *err = unknown_error; + int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error); + int logerr = 0; + int rsp_code = 0; + + if (index >= 0) { + logerr = cmd_status[index].log; + err = cmd_status[index].name; + } + + if (!logerr && (vhost->log_level <= IBMVFC_DEFAULT_LOG_LEVEL)) + return; + + if (rsp->flags & FCP_RSP_LEN_VALID) + rsp_code = rsp->data.info.rsp_code; + + scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) " + "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n", + cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error, + rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status); +} + +/** + * ibmvfc_scsi_done - Handle responses from commands + * @evt: ibmvfc event to be handled + * + * Used as a callback when sending scsi cmds. + **/ +static void ibmvfc_scsi_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; + struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; + struct scsi_cmnd *cmnd = evt->cmnd; + int rsp_len = 0; + int sense_len = rsp->fcp_sense_len; + + if (cmnd) { + if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID) + scsi_set_resid(cmnd, vfc_cmd->adapter_resid); + else if (rsp->flags & FCP_RESID_UNDER) + scsi_set_resid(cmnd, rsp->fcp_resid); + else + scsi_set_resid(cmnd, 0); + + if (vfc_cmd->status) { + cmnd->result = ibmvfc_get_err_result(vfc_cmd); + + if (rsp->flags & FCP_RSP_LEN_VALID) + rsp_len = rsp->fcp_rsp_len; + if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE) + sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len; + if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len) + memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len); + + ibmvfc_log_error(evt); + } + + if (!cmnd->result && + (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow)) + cmnd->result = (DID_ERROR << 16); + + scsi_dma_unmap(cmnd); + cmnd->scsi_done(cmnd); + } + + ibmvfc_free_event(evt); +} + +/** + * ibmvfc_host_chkready - Check if the host can accept commands + * @vhost: struct ibmvfc host + * + * Returns: + * 1 if host can accept command / 0 if not + **/ +static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost) +{ + int result = 0; + + switch (vhost->state) { + case IBMVFC_LINK_DEAD: + case IBMVFC_HOST_OFFLINE: + result = DID_NO_CONNECT << 16; + break; + case IBMVFC_NO_CRQ: + case IBMVFC_INITIALIZING: + case IBMVFC_HALTED: + case IBMVFC_LINK_DOWN: + result = DID_REQUEUE << 16; + break; + case IBMVFC_ACTIVE: + result = 0; + break; + }; + + return result; +} + +/** + * ibmvfc_queuecommand - The queuecommand function of the scsi template + * @cmnd: struct scsi_cmnd to be executed + * @done: Callback function to be called when cmnd is completed + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd, + void (*done) (struct scsi_cmnd *)) +{ + struct ibmvfc_host *vhost = shost_priv(cmnd->device->host); + struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device)); + struct ibmvfc_cmd *vfc_cmd; + struct ibmvfc_event *evt; + u8 tag[2]; + int rc; + + if (unlikely((rc = fc_remote_port_chkready(rport))) || + unlikely((rc = ibmvfc_host_chkready(vhost)))) { + cmnd->result = rc; + done(cmnd); + return 0; + } + + cmnd->result = (DID_OK << 16); + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT); + evt->cmnd = cmnd; + cmnd->scsi_done = done; + vfc_cmd = &evt->iu.cmd; + memset(vfc_cmd, 0, sizeof(*vfc_cmd)); + vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp); + vfc_cmd->resp.len = sizeof(vfc_cmd->rsp); + vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE; + vfc_cmd->payload_len = sizeof(vfc_cmd->iu); + vfc_cmd->resp_len = sizeof(vfc_cmd->rsp); + vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata; + vfc_cmd->tgt_scsi_id = rport->port_id; + if ((rport->supported_classes & FC_COS_CLASS3) && + (fc_host_supported_classes(vhost->host) & FC_COS_CLASS3)) + vfc_cmd->flags = IBMVFC_CLASS_3_ERR; + vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd); + int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun); + memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len); + + if (scsi_populate_tag_msg(cmnd, tag)) { + vfc_cmd->task_tag = tag[1]; + switch (tag[0]) { + case MSG_SIMPLE_TAG: + vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK; + break; + case MSG_HEAD_TAG: + vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE; + break; + case MSG_ORDERED_TAG: + vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK; + break; + }; + } + + if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev)))) + return ibmvfc_send_event(evt, vhost, 0); + + ibmvfc_free_event(evt); + if (rc == -ENOMEM) + return SCSI_MLQUEUE_HOST_BUSY; + + if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) + scmd_printk(KERN_ERR, cmnd, + "Failed to map DMA buffer for command. rc=%d\n", rc); + + cmnd->result = DID_ERROR << 16; + done(cmnd); + return 0; +} + +/** + * ibmvfc_sync_completion - Signal that a synchronous command has completed + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_sync_completion(struct ibmvfc_event *evt) +{ + /* copy the response back */ + if (evt->sync_iu) + *evt->sync_iu = *evt->xfer_iu; + + complete(&evt->comp); +} + +/** + * ibmvfc_reset_device - Reset the device with the specified reset type + * @sdev: scsi device to reset + * @type: reset type + * @desc: reset type description for log messages + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc) +{ + struct ibmvfc_host *vhost = shost_priv(sdev->host); + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + struct ibmvfc_cmd *tmf; + struct ibmvfc_event *evt; + union ibmvfc_iu rsp_iu; + struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp; + int rsp_rc = -EBUSY; + unsigned long flags; + int rsp_code = 0; + + spin_lock_irqsave(vhost->host->host_lock, flags); + if (vhost->state == IBMVFC_ACTIVE) { + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); + + tmf = &evt->iu.cmd; + memset(tmf, 0, sizeof(*tmf)); + tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp); + tmf->resp.len = sizeof(tmf->rsp); + tmf->frame_type = IBMVFC_SCSI_FCP_TYPE; + tmf->payload_len = sizeof(tmf->iu); + tmf->resp_len = sizeof(tmf->rsp); + tmf->cancel_key = (unsigned long)sdev->hostdata; + tmf->tgt_scsi_id = rport->port_id; + int_to_scsilun(sdev->lun, &tmf->iu.lun); + tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF); + tmf->iu.tmf_flags = type; + evt->sync_iu = &rsp_iu; + + init_completion(&evt->comp); + rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); + } + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (rsp_rc != 0) { + sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n", + desc, rsp_rc); + return -EIO; + } + + sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc); + wait_for_completion(&evt->comp); + + if (rsp_iu.cmd.status) { + if (fc_rsp->flags & FCP_RSP_LEN_VALID) + rsp_code = fc_rsp->data.info.rsp_code; + + sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) " + "flags: %x fcp_rsp: %x, scsi_status: %x\n", + desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error), + rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code, + fc_rsp->scsi_status); + rsp_rc = -EIO; + } else + sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc); + + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_free_event(evt); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return rsp_rc; +} + +/** + * ibmvfc_abort_task_set - Abort outstanding commands to the device + * @sdev: scsi device to abort commands + * + * This sends an Abort Task Set to the VIOS for the specified device. This does + * NOT send any cancel to the VIOS. That must be done separately. + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_abort_task_set(struct scsi_device *sdev) +{ + struct ibmvfc_host *vhost = shost_priv(sdev->host); + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + struct ibmvfc_cmd *tmf; + struct ibmvfc_event *evt, *found_evt; + union ibmvfc_iu rsp_iu; + struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp; + int rsp_rc = -EBUSY; + unsigned long flags; + int rsp_code = 0; + + spin_lock_irqsave(vhost->host->host_lock, flags); + found_evt = NULL; + list_for_each_entry(evt, &vhost->sent, queue) { + if (evt->cmnd && evt->cmnd->device == sdev) { + found_evt = evt; + break; + } + } + + if (!found_evt) { + if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) + sdev_printk(KERN_INFO, sdev, "No events found to abort\n"); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return 0; + } + + if (vhost->state == IBMVFC_ACTIVE) { + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); + + tmf = &evt->iu.cmd; + memset(tmf, 0, sizeof(*tmf)); + tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp); + tmf->resp.len = sizeof(tmf->rsp); + tmf->frame_type = IBMVFC_SCSI_FCP_TYPE; + tmf->payload_len = sizeof(tmf->iu); + tmf->resp_len = sizeof(tmf->rsp); + tmf->cancel_key = (unsigned long)sdev->hostdata; + tmf->tgt_scsi_id = rport->port_id; + int_to_scsilun(sdev->lun, &tmf->iu.lun); + tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF); + tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET; + evt->sync_iu = &rsp_iu; + + init_completion(&evt->comp); + rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); + } + + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (rsp_rc != 0) { + sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc); + return -EIO; + } + + sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n"); + wait_for_completion(&evt->comp); + + if (rsp_iu.cmd.status) { + if (fc_rsp->flags & FCP_RSP_LEN_VALID) + rsp_code = fc_rsp->data.info.rsp_code; + + sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) " + "flags: %x fcp_rsp: %x, scsi_status: %x\n", + ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error), + rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code, + fc_rsp->scsi_status); + rsp_rc = -EIO; + } else + sdev_printk(KERN_INFO, sdev, "Abort successful\n"); + + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_free_event(evt); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return rsp_rc; +} + +/** + * ibmvfc_cancel_all - Cancel all outstanding commands to the device + * @sdev: scsi device to cancel commands + * @type: type of error recovery being performed + * + * This sends a cancel to the VIOS for the specified device. This does + * NOT send any abort to the actual device. That must be done separately. + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_cancel_all(struct scsi_device *sdev, int type) +{ + struct ibmvfc_host *vhost = shost_priv(sdev->host); + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + struct ibmvfc_tmf *tmf; + struct ibmvfc_event *evt, *found_evt; + union ibmvfc_iu rsp; + int rsp_rc = -EBUSY; + unsigned long flags; + u16 status; + + ENTER; + spin_lock_irqsave(vhost->host->host_lock, flags); + found_evt = NULL; + list_for_each_entry(evt, &vhost->sent, queue) { + if (evt->cmnd && evt->cmnd->device == sdev) { + found_evt = evt; + break; + } + } + + if (!found_evt) { + if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) + sdev_printk(KERN_INFO, sdev, "No events found to cancel\n"); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return 0; + } + + if (vhost->state == IBMVFC_ACTIVE) { + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); + + tmf = &evt->iu.tmf; + memset(tmf, 0, sizeof(*tmf)); + tmf->common.version = 1; + tmf->common.opcode = IBMVFC_TMF_MAD; + tmf->common.length = sizeof(*tmf); + tmf->scsi_id = rport->port_id; + int_to_scsilun(sdev->lun, &tmf->lun); + tmf->flags = (type | IBMVFC_TMF_LUA_VALID); + tmf->cancel_key = (unsigned long)sdev->hostdata; + tmf->my_cancel_key = (IBMVFC_TMF_CANCEL_KEY | (unsigned long)sdev->hostdata); + + evt->sync_iu = &rsp; + init_completion(&evt->comp); + rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); + } + + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (rsp_rc != 0) { + sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc); + return -EIO; + } + + sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n"); + + wait_for_completion(&evt->comp); + status = rsp.mad_common.status; + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_free_event(evt); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (status != IBMVFC_MAD_SUCCESS) { + sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status); + return -EIO; + } + + sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n"); + return 0; +} + +/** + * ibmvfc_eh_abort_handler - Abort a command + * @cmd: scsi command to abort + * + * Returns: + * SUCCESS / FAILED + **/ +static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd) +{ + struct ibmvfc_host *vhost = shost_priv(cmd->device->host); + struct ibmvfc_event *evt, *pos; + int cancel_rc, abort_rc; + unsigned long flags; + + ENTER; + ibmvfc_wait_while_resetting(vhost); + cancel_rc = ibmvfc_cancel_all(cmd->device, IBMVFC_TMF_ABORT_TASK_SET); + abort_rc = ibmvfc_abort_task_set(cmd->device); + + if (!cancel_rc && !abort_rc) { + spin_lock_irqsave(vhost->host->host_lock, flags); + list_for_each_entry_safe(evt, pos, &vhost->sent, queue) { + if (evt->cmnd && evt->cmnd->device == cmd->device) + ibmvfc_fail_request(evt, DID_ABORT); + } + spin_unlock_irqrestore(vhost->host->host_lock, flags); + LEAVE; + return SUCCESS; + } + + LEAVE; + return FAILED; +} + +/** + * ibmvfc_eh_device_reset_handler - Reset a single LUN + * @cmd: scsi command struct + * + * Returns: + * SUCCESS / FAILED + **/ +static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd) +{ + struct ibmvfc_host *vhost = shost_priv(cmd->device->host); + struct ibmvfc_event *evt, *pos; + int cancel_rc, reset_rc; + unsigned long flags; + + ENTER; + ibmvfc_wait_while_resetting(vhost); + cancel_rc = ibmvfc_cancel_all(cmd->device, IBMVFC_TMF_LUN_RESET); + reset_rc = ibmvfc_reset_device(cmd->device, IBMVFC_LUN_RESET, "LUN"); + + if (!cancel_rc && !reset_rc) { + spin_lock_irqsave(vhost->host->host_lock, flags); + list_for_each_entry_safe(evt, pos, &vhost->sent, queue) { + if (evt->cmnd && evt->cmnd->device == cmd->device) + ibmvfc_fail_request(evt, DID_ABORT); + } + spin_unlock_irqrestore(vhost->host->host_lock, flags); + LEAVE; + return SUCCESS; + } + + LEAVE; + return FAILED; +} + +/** + * ibmvfc_dev_cancel_all - Device iterated cancel all function + * @sdev: scsi device struct + * @data: return code + * + **/ +static void ibmvfc_dev_cancel_all(struct scsi_device *sdev, void *data) +{ + unsigned long *rc = data; + *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET); +} + +/** + * ibmvfc_dev_abort_all - Device iterated abort task set function + * @sdev: scsi device struct + * @data: return code + * + **/ +static void ibmvfc_dev_abort_all(struct scsi_device *sdev, void *data) +{ + unsigned long *rc = data; + *rc |= ibmvfc_abort_task_set(sdev); +} + +/** + * ibmvfc_eh_target_reset_handler - Reset the target + * @cmd: scsi command struct + * + * Returns: + * SUCCESS / FAILED + **/ +static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd) +{ + struct ibmvfc_host *vhost = shost_priv(cmd->device->host); + struct scsi_target *starget = scsi_target(cmd->device); + struct ibmvfc_event *evt, *pos; + int reset_rc; + unsigned long cancel_rc = 0; + unsigned long flags; + + ENTER; + ibmvfc_wait_while_resetting(vhost); + starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all); + reset_rc = ibmvfc_reset_device(cmd->device, IBMVFC_TARGET_RESET, "target"); + + if (!cancel_rc && !reset_rc) { + spin_lock_irqsave(vhost->host->host_lock, flags); + list_for_each_entry_safe(evt, pos, &vhost->sent, queue) { + if (evt->cmnd && scsi_target(evt->cmnd->device) == starget) + ibmvfc_fail_request(evt, DID_ABORT); + } + spin_unlock_irqrestore(vhost->host->host_lock, flags); + LEAVE; + return SUCCESS; + } + + LEAVE; + return FAILED; +} + +/** + * ibmvfc_eh_host_reset_handler - Reset the connection to the server + * @cmd: struct scsi_cmnd having problems + * + **/ +static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd) +{ + int rc; + struct ibmvfc_host *vhost = shost_priv(cmd->device->host); + + dev_err(vhost->dev, "Resetting connection due to error recovery\n"); + rc = ibmvfc_issue_fc_host_lip(vhost->host); + return rc ? FAILED : SUCCESS; +} + +/** + * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport. + * @rport: rport struct + * + * Return value: + * none + **/ +static void ibmvfc_terminate_rport_io(struct fc_rport *rport) +{ + struct scsi_target *starget = to_scsi_target(&rport->dev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct ibmvfc_host *vhost = shost_priv(shost); + struct ibmvfc_event *evt, *pos; + unsigned long cancel_rc = 0; + unsigned long abort_rc = 0; + unsigned long flags; + + ENTER; + starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all); + starget_for_each_device(starget, &abort_rc, ibmvfc_dev_abort_all); + + if (!cancel_rc && !abort_rc) { + spin_lock_irqsave(shost->host_lock, flags); + list_for_each_entry_safe(evt, pos, &vhost->sent, queue) { + if (evt->cmnd && scsi_target(evt->cmnd->device) == starget) + ibmvfc_fail_request(evt, DID_ABORT); + } + spin_unlock_irqrestore(shost->host_lock, flags); + } else + ibmvfc_issue_fc_host_lip(shost); + + scsi_target_unblock(&rport->dev); + LEAVE; +} + +static const struct { + enum ibmvfc_async_event ae; + const char *desc; +} ae_desc [] = { + { IBMVFC_AE_ELS_PLOGI, "PLOGI" }, + { IBMVFC_AE_ELS_LOGO, "LOGO" }, + { IBMVFC_AE_ELS_PRLO, "PRLO" }, + { IBMVFC_AE_SCN_NPORT, "N-Port SCN" }, + { IBMVFC_AE_SCN_GROUP, "Group SCN" }, + { IBMVFC_AE_SCN_DOMAIN, "Domain SCN" }, + { IBMVFC_AE_SCN_FABRIC, "Fabric SCN" }, + { IBMVFC_AE_LINK_UP, "Link Up" }, + { IBMVFC_AE_LINK_DOWN, "Link Down" }, + { IBMVFC_AE_LINK_DEAD, "Link Dead" }, + { IBMVFC_AE_HALT, "Halt" }, + { IBMVFC_AE_RESUME, "Resume" }, + { IBMVFC_AE_ADAPTER_FAILED, "Adapter Failed" }, +}; + +static const char *unknown_ae = "Unknown async"; + +/** + * ibmvfc_get_ae_desc - Get text description for async event + * @ae: async event + * + **/ +static const char *ibmvfc_get_ae_desc(u64 ae) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ae_desc); i++) + if (ae_desc[i].ae == ae) + return ae_desc[i].desc; + + return unknown_ae; +} + +/** + * ibmvfc_handle_async - Handle an async event from the adapter + * @crq: crq to process + * @vhost: ibmvfc host struct + * + **/ +static void ibmvf
