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* [SCSI] iscsi class: Add new NETLINK_ISCSI messages for cnic/bnx2i driver.Michael Chan2009-06-09
| | | | | | | | | | | | | Add ISCSI_NETLINK messages for iSCSI NICs to get information such as path from userspace. Original iscsid messages are now always sent as multicast to group 1. The new messages are sent to group 2. The multicast changes were made by Mike Christie. Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: Benjamin Li <benli@broadcom.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi: pass ep connect shostMike Christie2009-05-23
| | | | | | | | | | | | | | | | | | | | When we create the tcp/ip connection by calling ep_connect, we currently just go by the routing table info. I think there are two problems with this. 1. Some drivers do not have access to a routing table. Some drivers like qla4xxx do not even know about other ports. 2. If you have two initiator ports on the same subnet, the user may have set things up so that session1 was supposed to be run through port1. and session2 was supposed to be run through port2. It looks like we could end with both sessions going through one of the ports. Fixes for cxgb3i from Karen Xie. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class: remove host no argument from session creation calloutMike Christie2009-03-13
| | | | | | | | | | We do not need to have llds set the host no for the session's parent, because we know the session's parent is going to be the host. This removes it from the session creation callback and converts the drivers. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class: fix lock dep warning on logoutMike Christie2009-03-13
| | | | | | | | | | | We never should hit the lock up that is spit out when lock dep is on and we logout. But we have been using the shost work queue in a odd way. This patch has us use the work queue for scanning instead of creating our own, and this ends up also killing the lock dep warnings. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] libiscsi: pass opcode into alloc_pdu calloutMike Christie2008-12-29
| | | | | | | | We do not need to allocate a itt for data_out, so this passes the opcode to the alloc_pdu callout. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] libiscsi: allow drivers to modify the itt sent to the targetMike Christie2008-12-29
| | | | | | | | | | | | | | bnx2i and cxgb3i need to encode LLD info in the itt so that the firmware/hardware can process the pdu. This patch allows the LLDs to encode info in the task->hdr->itt that they setup in the alloc_pdu callout (any resources that are allocated can be freed with the pdu in the cleanup_task callout). If the LLD encodes info in the itt they should implement a parse_pdu_itt callout. If parse_pdu_itt is not implemented libiscsi will do the right thing for the LLD. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] libiscsi: prepare libiscsi for new offload engines by modifying unsol ↵Mike Christie2008-12-29
| | | | | | | | | | | | | data code cxgb3i offloads data transfers. It does not offload the entire scsi/iscsi procssing like qla4xxx and it does not offload the iscsi sequence processing like how bnx2i does. cxgb3i relies on iscsi_tcp for the seqeunce handling so this changes how we transfer unsolicitied data by adding a common r2t struct and helpers. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class: fix endpoint id handlingMike Christie2008-10-13
| | | | | | | | Some endpoint code was using unsigned int and some was using uint64_t. This converts it all to uint64_t. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] libiscsi: Support drivers initiating session removalMike Christie2008-10-13
| | | | | | | | | | | | | | | | If the driver knows when hardware is removed like with cxgb3i, bnx2i, qla4xxx and iser then we will want to remove the sessions/devices that are bound to that device before removing the host. cxgb3i and in the future bnx2i will remove the host and that will remove all the sessions on the hba. iser can call iscsi_kill_session when it gets an event that indicates that a hca is removed. And when qla4xxx is hooked in to the lib (it is only hooked into the class right now) it can call iscsi remove host like the partial offload card drivers. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* driver core: remove KOBJ_NAME_LEN defineKay Sievers2008-07-22
| | | | | | | | | Kobjects do not have a limit in name size since a while, so stop pretending that they do. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [SCSI] iscsi class: add endpoint classMike Christie2008-07-12
| | | | | | | | | | | | Add sysfs representation for the endpoint, so userspace can match the host and session to the endpoint. This will allow us to set the host's parent correctly at host creation time. The next patches will convert tcp and iser, and fix iser's dma_mask bug. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class: user device_for_each_child instead of duplicating ↵Mike Christie2008-07-12
| | | | | | | | | | | | | session list Currently we duplicate the list of sessions, because we were using the test for if a session was on the host list to indicate if the session was bound or unbound. We can instead use the target_id and fix up the class so that drivers like bnx2i do not have to manage the target id space. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] libiscsi: rename iscsi_cmd_task to iscsi_taskMike Christie2008-07-12
| | | | | | | | | This is the second part of the iscsi task merging, and all it does it rename iscsi_cmd_task to iscsi_task and mtask/ctask to just task. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] libiscsi: merge iscsi_mgmt_task and iscsi_cmd_taskMike Christie2008-07-12
| | | | | | | | | | | There is no need to have the mgmt and cmd tasks separate structs. It used to save a lot of memory when we overprealocated memory for tasks, but the next patches will set up the driver so in the future they can use a mempool or some other common scsi command allocator and common tagging. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi: remove session/conn_data_size from iscsi_transportMike Christie2008-07-12
| | | | | | | | | This removes the session and conn data_size fields from the iscsi_transport. Just pass in the value like with host allocation. This patch also makes it so the LLD iscsi_conn data is allocated with the iscsi_cls_conn. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi: add iscsi host helpersMike Christie2008-07-12
| | | | | | | | This finishes the host/session unbinding, by adding some helpers to add and remove hosts and the session they manage. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi: remove session and host binding in libiscsiMike Christie2008-07-12
| | | | | | | | | | | bnx2i allocates a host per netdevice but will use libiscsi, so this unbinds the session from the host in that code. This will also be useful for the iser parent device dma settings fixes. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class: rename iscsi_host to iscsi_cls_hostMike Christie2008-07-12
| | | | | | | | | This renames the iscsi_host to iscsi_cls_host to match the other structs, because libiscsi wants to use the iscsi_host name in the future. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class, iscsi drivers: remove unused iscsi_transport attrsMike Christie2008-07-12
| | | | | | | | | max_cmd_len and max_conn are not really used. max_cmd_len is always 16 and can be set by the LLD. max_conn is always one since we do not support MCS. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class, iscsi_tcp/iser: add host arg to session creationMike Christie2008-07-12
| | | | | | | | | | | | | iscsi offload (bnx2i and qla4xx) allocate a scsi host per hba, so the session creation path needs a shost/host_no argument. Software iscsi/iser will follow the same behabior as before where it allcoates a host per session, but in the future iser will probably look more like bnx2i where the host's parent is the hardware (rnic for iser and for bnx2i it is the nic), because it does not use a socket layer like how iscsi_tcp does. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class: regression - fix races with state manipulation and ↵Mike Christie2008-03-05
| | | | | | | | | | | | | blocking/unblocking For qla4xxx, we could be starting a session, but some error (network, target, IO from a device that got started, etc) could cause the session to fail and curring the block/unblock and state manipulation could race with each other. This patch just has those operations done in the single threaded iscsi eh work queue, so that way they are serialized. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi: fix up iscsi printk prefixMike Christie2008-02-07
| | | | | | | | | | | | Some iscsi class messages have the dev_printk prefix and some libiscsi and iscsi_tcp messages have "iscsi" or the module name as a prefix which is normally pretty useless when trying to figure out which session or connection the message is attached to. This patch adds iscsi lib and class dev_printks so all messages have a common prefix that can be used to figure out which object printed it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class: add async scan helperMike Christie2008-02-07
| | | | | | | | | | In qla4xxx's probe it will call the iscsi session setup functions for session that got setup on the initial start. This then makes it easy for the iscsi class to export a helper which indicates when those scans are done. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class: add session scanningMike Christie2008-02-07
| | | | | | | | | | | This just adds iscsi session scanning which works like fc rport scanning. The future patches will hook the drivers into Mathew Wilcox's async scanning infrastructure, so userspace does not have to special case iscsi and so userspace does not have to make a extra special case for hardware iscsi root scanning. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi class, libiscsi: add iscsi sysfs session state fileMike Christie2008-02-07
| | | | | | | | | This adds a iscsi session state file which exports the session state for both software and hardware iscsi. It also hooks libiscsi in. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] iscsi: convert xmit path to iscsi chunksOlaf Kirch2008-01-11
| | | | | | | | | | | | | | Convert xmit to iscsi chunks. from michaelc@cs.wisc.edu: Bug fixes, more digest integration, sg chaining conversion and other sg wrapper changes, coding style sync up, and removal of io fields, like pdu_sent, that are not needed. Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] libiscsi: fix shutdownMike Christie2008-01-11
| | | | | | | | | | | | | We were using the device delete sysfs file to remove each device then logout. Now in 2.6.21 this will not work because the sysfs delete file returns immediately and does not wait for the device removal to complete. This causes a hang if a cache sync is needed during shutdown. Before .21, that approach had other problems, so this patch fixes the shutdown code so that we remove the target and unbind the session before logging out and shut down the session Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] libiscsi: do not block session during logoutMike Christie2008-01-11
| | | | | | | | | There is not need to block the session during logout. Since we are going to fail the commands that were blocked just fail them immediately instead. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* [SCSI] scsi_transport_iscsi: add list, mutex includesMichael S. Tsirkin2007-10-12
| | | | | | | | | | | | scsi/scsi_transport_iscsi.h uses struct mutex and struct list_head, so while linux/mutex.h and linux/list.h seem to be pulled in indirectly by one of the headers it includes, the right thing is to include linux/mutex.h and linus/list.h directly. Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il> Acked-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] libiscsi: make can_queue configurableMike Christie2007-06-02
| | | | | | | | | | | | This patch allows us to set can_queue and cmds_per_lun from userspace when we create the session/host. From there we can set it on a per target basis. The patch fully converts iscsi_tcp, but only hooks up ib_iser for cmd_per_lun since it currently has a lots of preallocations based on can_queue. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] libiscsi: fix iscsi cmdsn allocationMike Christie2007-06-02
| | | | | | | | | | | | | | | | | | | | | The cmdsn allocation and pdu transmit code can race, and we can end up sending a pdu with cmdsn 10 before a pdu with 5. The target will then fail the connection/session. This patch fixes the problem by delaying the cmdsn allocation until we are about to send the pdu. This also removes the xmitmutex. We were using the connection xmitmutex during error handling to handle races with mtask and ctask cleanup and completion. For ctasks we now have nice refcounting and for the mtask, if we hit the case where the mtask timesout and it is floating around somewhere in the driver, we end up dropping the session. And to handle session level cleanup, we use the xmit suspend bit along with scsi_flush_queue and the session lock to make sure that the xmit thread is not possibly transmitting a task while we are trying to kill it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi class: add iscsi host set param eventMike Christie2007-06-01
| | | | | | | | | The iscsi class uses the set_param event to set session and connection params. This patch adds a set_host_param so we can set host level values. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi_transport, qla4xxx: have class lookup host for driversMike Christie2007-06-01
| | | | | | | | | | We are going to be adding more host level sysfs attrs and set_params, so this patch has them take a scsi_host instead of either a scsi_host or host no. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Cc: David C Somayajulu <david.somayajulu@qlogic.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi_transport: export hw addressMike Christie2007-06-01
| | | | | | | Add hw address sysfs file. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* WorkStruct: make allyesconfigDavid Howells2006-11-22
| | | | | | Fix up for make allyesconfig. Signed-Off-By: David Howells <dhowells@redhat.com>
* [SCSI] iscsi class: fix slab corruption during restartMike Christie2006-10-25
| | | | | | | | | | | | | | | | | The transport class recv mempools are causing slab corruption. We could hack around netlink's lack of mempool support like dm, but it is just too ulgy (dm's hack is ugly enough :) when you need to support broadcast. This patch removes the recv pools. We have not used them even when we were allocting 20 MB per session and the system only had 64 MBs. And we have no pools on the send side and have been ok there. When Peter's work gets merged we can use that since the network guys are in favor of that approach and are not going to add mempools everywhere. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi bugfixes: fix oops when iser is flushing ioMike Christie2006-07-28
| | | | | | | | | | | | | When we enter recovery and flush the running commands we cannot freee the connection before flushing the commands. Some commands may have a reference to the connection that needs to be released before. iscsi_stop was forcing the term and suspend too early and was causing a oops in iser, so this patch removes those callbacks all together and allows the LLD to handle that detail. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: add async notification of session eventsMike Christie2006-06-29
| | | | | | | | | | | | | | This patch adds or modifies the transport class functions used to notify userspace of session state events. We modify the session addition up event and add a destruction event to notify userspace of session creation, relogin and destruction. And we modify the conn error event to be sent by broadcast since multiple listeners may want to listen for it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: pass target nr to session creationMike Christie2006-06-29
| | | | | | | | | | | | | | | | So the drivers do not use the channel numbers, but some do use the target numbers. We were just adding some goofy variable that just increases for the target nr. This is useless for software iscsi because it is always zero. And for qla4xxx the target nr is actually the index of the target/session in its FW or FLASH tables. We needed to expose this to userspace so apps could access those numbers so this patch just adds the target nr to the iscsi session creation functions. This way when qla4xxx's Hw thinks a session is at target nr 4 in its hw, it is exposed as that number in sysfs. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: break up session creation into two stagesMike Christie2006-06-29
| | | | | | | | | | | | | | | | | | | | | | qla4xxx is initialized in two steps like other HW drivers. It allocates the host, sets up the HW, then adds the host. For iscsi part of HW setup is setting up persistent iscsi sessions. At that time, the interupts are off and the driver is not completely set up so we just want to allocate them. We do not want to add them to sysfs and expose them to userspace because userspace could try to do lots of fun things with them like scanning and at that time the driver is not ready. So this patch breakes up the session creation like other functions that use the driver model in two the alloc and add parts. When the driver is ready, it can then add the sessions and userspace can begin using them. This also fixes a bug in the addition error patch where we forgot to do a get on the session. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: rm channel usage from iscsiMike Christie2006-06-29
| | | | | | | | | | | | I do not remember what I was thinking when we added the channel as a argument to the session create function. It was probably due to too much cut and paste work from the FC transport class. The channel is meaningless for iscsi drivers so this patch drops its usage everywhere in the iscsi related code. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: fixup set/get param functionsMike Christie2006-06-29
| | | | | | | | | | | | | | Reduce duplication in the software iscsi_transport modules by adding a libiscsi function to handle the common grunt work. This also has the drivers return specifc -EXXX values for different errors so userspace can finally handle them in a sane way. Also just pass the sysfs buffers to the drivers so HW iscsi can get/set its string values, like targetname, and initiatorname. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: add target discvery event to transport classMike Christie2006-06-29
| | | | | | | | | | | | | Patch from david.somayajulu@qlogic.com: Add target discovery event. We may have a setup where the iscsi traffic is on a different netowrk than the other network traffic. In this case we will want to do discovery though the iscsi card. This patch adds a event to the transport class that can be used by hw iscsi cards that support this. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: fix writepsace raceMike Christie2006-06-05
| | | | | | | | | | | | | | | We can race and misset the suspend bit if iscsi_write_space is called then iscsi_send returns with a failure indicating there is no space. To handle this this patch returns a error upwards allowing xmitworker to decide if we need to try and transmit again. For the no write space case xmitworker will not retry, and instead let iscsi_write_space queue it back up if needed (this relies on the work queue code to properly requeue us if needed). Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: fix command requeues during iscsi recoveryMike Christie2006-05-20
| | | | | | | | | | | | | | Do not flush queues then block session. This will cause commands to needlessly swing around on us and remove goofy recovery_failed field and replace with state value. And do not start recovery from within the host reset function. This causeis too many problems becuase open-iscsi was desinged to call out to userspace then have userpscae decide if we should go into recovery or kill the session. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: add transport end point callbacksOr Gerlitz2006-05-10
| | | | | | | | | | add transport end point callbacks so iscsi drivers that cannot connect from userspace, like iscsi tcp, using sockets do not have to implement their own socket infrastructure. Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: add libiscsiMike Christie2006-04-14
| | | | | | | | | | | | | | | | | | | | | | | | There is a lot of code duplcited between iscsi_tcp and the upcoming iscsi_iser driver. This patch puts the duplicated code in a lib. There is more code to move around but this takes care of the basics. For iscsi_offload if they use the lib we will probably move some things around. For example in the queuecommand we will not assume that the LLD wants to do queue_work, but it is better to handle that later when we know for sure what iscsi_offload looks like (we could probably do this for iscsi_iser though to). Ideally I would like to get the iscsi_transports modules to a place where all they really have to do is put data on the wire, but how to do that will hopefully be more clear when we see other modules like iscsi_offload. Or maybe iscsi_offload will not use the lib and it will just be iscsi_iser and iscsi_tcp and maybe the iscsi_tcp_tgt if that is allowed in mainline. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: fix up iscsi ehMike Christie2006-04-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current iscsi_tcp eh is not nicely setup for dm-multipath and performs some extra task management functions when they are not needed. The attached patch: - Fixes the TMF issues. If a session is rebuilt then we do not send aborts. - Fixes the problem where if the host reset fired, we would return SUCCESS even though we had not really done anything yet. This ends up causing problem with scsi_error.c's TUR. - If someone has turned on the userspace nop daemon code to try and detect network problems before the scsi command timeout we can now drop and clean up the session before the scsi command timesout and fires the eh speeding up the time it takes for a command to go from one patch to another. For network problems we fail the command with DID_BUS_BUSY so if failfast is set scsi_decide_disposition fails the command up to dm for it to try on another path. - And we had to add some basic iscsi session block code. Previously if we were trying to repair a session we would retrun a MLQUEUE code in the queuecommand. This worked but it was not the most efficient or pretty thing to do since it would take a while to relogin to the target. For iscsi_tcp/open-iscsi a lot of the iscsi error handler is in userspace the block code is pretty bare. We will be adding to that for qla4xxx. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: add sysfs attrs for uspace sync upMike Christie2006-04-14
| | | | | | | | | | | | | | For iscsi boot when going from initramfs to the real root we need to stop the userpsace iscsi daemon. To later restart it iscsid needs to be able to rebuild itself and part of that process is matching a session running the kernel with the iscsid representation. To do this the attached patch adds several required iscsi values. If the LLD does not provide them becuase, login is done in userspace, then the transport class and userspace set ths up for the LLD. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* [SCSI] iscsi: rm kernel iscsi handles usage for session and connectionMike Christie2006-04-14
| | | | | | | | | | | | | | | | | | | | | | | | from hare@suse.de and michaelc@cs.wisc.edu hw iscsi like qla4xxx does not allocate a host per session and for userspace it is difficult to restart iscsid using the "iscsi handles" for the session and connection, so this patch just has the class or userspace allocate the id for the session and connection. Note: this breaks userspace and requires users to upgrade to the newest open-iscsi tools. Sorry about his but open-iscsi is still too new to say we have a stable user-kernel api and we were not good nough designers to know that other hw iscsi drivers and iscsid itself would need such changes. Actually we sorta did but at the time we did not have the HW available to us so we could only guess. Luckily, the only tools hooking into the class are the open-iscsi ones or other tools like iscsitart hook into the open-iscsi engine from userspace or prgroams like anaconda call our tools so they are not affected. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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