linux/include/target, branch v3.14

iscsi/iser-target: Fix isert_conn->state hung shutdown issues

2014-03-05T01:54:09Z

This patch addresses a couple of different hug shutdown issues related to wait_event() + isert_conn->state. First, it changes isert_conn->conn_wait + isert_conn->conn_wait_comp_err from waitqueues to completions, and sets ISER_CONN_TERMINATING from within isert_disconnect_work(). Second, it splits isert_free_conn() into isert_wait_conn() that is called earlier in iscsit_close_connection() to ensure that all outstanding commands have completed before continuing. Finally, it breaks isert_cq_comp_err() into seperate TX / RX related code, and adds logic in isert_cq_rx_comp_err() to wait for outstanding commands to complete before setting ISER_CONN_DOWN and calling complete(&isert_conn->conn_wait_comp_err). Acked-by: Sagi Grimberg Cc: Or Gerlitz Cc: #3.10+ Signed-off-by: Nicholas Bellinger

target: Simplify command completion by removing CMD_T_FAILED flag

2014-02-12T23:14:30Z

The CMD_T_FAILED flag is set used in one place to record the result of a trivial test, and it is only tested once, few lines later. We might as well make the code simpler and easier to read by directly doing the test of "success" where we want to use it. Signed-off-by: Roland Dreier Signed-off-by: Nicholas Bellinger

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

2014-01-31T23:31:23Z

Pull SCSI target updates from Nicholas Bellinger: "The highlights this round include: - add support for SCSI Referrals (Hannes) - add support for T10 DIF into target core (nab + mkp) - add support for T10 DIF emulation in FILEIO + RAMDISK backends (Sagi + nab) - add support for T10 DIF -> bio_integrity passthrough in IBLOCK backend (nab) - prep changes to iser-target for >= v3.15 T10 DIF support (Sagi) - add support for qla2xxx N_Port ID Virtualization - NPIV (Saurav + Quinn) - allow percpu_ida_alloc() to receive task state bitmask (Kent) - fix >= v3.12 iscsi-target session reset hung task regression (nab) - fix >= v3.13 percpu_ref se_lun->lun_ref_active race (nab) - fix a long-standing network portal creation race (Andy)" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (51 commits) target: Fix percpu_ref_put race in transport_lun_remove_cmd target/iscsi: Fix network portal creation race target: Report bad sector in sense data for DIF errors iscsi-target: Convert gfp_t parameter to task state bitmask iscsi-target: Fix connection reset hang with percpu_ida_alloc percpu_ida: Make percpu_ida_alloc + callers accept task state bitmask iscsi-target: Pre-allocate more tags to avoid ack starvation qla2xxx: Configure NPIV fc_vport via tcm_qla2xxx_npiv_make_lport qla2xxx: Enhancements to enable NPIV support for QLOGIC ISPs with TCM/LIO. qla2xxx: Fix scsi_host leak on qlt_lport_register callback failure IB/isert: pass scatterlist instead of cmd to fast_reg_mr routine IB/isert: Move fastreg descriptor creation to a function IB/isert: Avoid frwr notation, user fastreg IB/isert: seperate connection protection domains and dma MRs tcm_loop: Enable DIF/DIX modes in SCSI host LLD target/rd: Add DIF protection into rd_execute_rw target/rd: Add support for protection SGL setup + release target/rd: Refactor rd_build_device_space + rd_release_device_space target/file: Add DIF protection support to fd_execute_rw target/file: Add DIF protection init/format support ...

target: Fix percpu_ref_put race in transport_lun_remove_cmd

2014-01-30T11:58:34Z

This patch fixes a percpu_ref_put race for se_lun->lun_ref in transport_lun_remove_cmd() where ->lun_ref could end up being put more than once per command via different target completion and fabric release contexts. It adds a cmpxchg() for se_cmd->lun_ref_active to ensure that percpu_ref_put() is only ever called once per se_cmd. This bug was manifesting itself as a LUN shutdown regression bug in >= v3.13 code, where percpu_ref_kill() would end up hanging indefinately due to the incorrect percpu_ref count. (Change se_cmd->lun_ref_active from bool -> int to force at least a 4-byte cmpxchg with MIPS ll/sc ins. - Fengguang) Reported-by: Tommy Apel Cc: Tommy Apel Cc: #3.13+ Signed-off-by: Nicholas Bellinger

target: Report bad sector in sense data for DIF errors

2014-01-25T06:58:53Z

SPC-4 states that data-integrity errors shall also report the failed sector in CHECK_CONDITION response sense data information field. Signed-off-by: Sagi Grimberg Signed-off-by: Nicholas Bellinger

iscsi-target: Convert gfp_t parameter to task state bitmask

2014-01-25T06:58:52Z

This patch propigates the use of task state bitmask now used by percpu_ida_alloc() up the iscsi-target callchain, replacing the use of GFP_ATOMIC for TASK_RUNNING, and GFP_KERNEL for TASK_INTERRUPTIBLE. Also, drop the unnecessary gfp_t parameter to isert_allocate_cmd(), and just pass TASK_INTERRUPTIBLE into iscsit_allocate_cmd(). Signed-off-by: Nicholas Bellinger

target: Add protection SGLs to target_submit_cmd_map_sgls

2014-01-18T09:58:09Z

This patch adds support to target_submit_cmd_map_sgls() for accepting 'sgl_prot' + 'sgl_prot_count' parameters for DIF protection information. Note the passed parameters are stored at se_cmd->t_prot_sg and se_cmd->t_prot_nents respectively. Also, update tcm_loop and vhost-scsi fabrics usage of target_submit_cmd_map_sgls() to take into account the new parameters. Cc: Martin K. Petersen Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Sagi Grimberg Cc: Or Gerlitz Signed-off-by: Nicholas Bellinger

target/sbc: Add DIF TYPE1+TYPE3 read/write verify emulation

2014-01-18T09:53:12Z

This patch adds support for DIF read/write verify emulation for TARGET_DIF_TYPE1_PROT + TARGET_DIF_TYPE3_PROT operation. This includes sbc_dif_verify_write() + sbc_dif_verify_read() calls accessable by backend drivers to perform DIF verify for SGL based data and protection information. Also included is sbc_dif_copy_prot() logic to copy protection information to/from backend provided protection SGLs. Based on scsi_debug.c DIF TYPE1+TYPE3 emulation. v2 changes: - Select CRC_T10DIF for TARGET_CORE in Kconfig (Fengguang) - Drop IP checksum logic from sbc_dif_v1_verify (MKP) - Fix offset on app_tag = 0xffff in sbc_dif_verify_read() Cc: Martin K. Petersen Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Sagi Grimberg Cc: Or Gerlitz Signed-off-by: Nicholas Bellinger

target: Add DIF CHECK_CONDITION ASC/ASCQ exception cases

2014-01-18T09:53:11Z

This patch adds support for DIF related CHECK_CONDITION ASC/ASCQ exception cases into transport_send_check_condition_and_sense(). This includes: LOGICAL BLOCK GUARD CHECK FAILED LOGICAL BLOCK APPLICATION TAG CHECK FAILED LOGICAL BLOCK REFERENCE TAG CHECK FAILED that used by DIF TYPE1 and TYPE3 failure cases. Cc: Martin K. Petersen Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Sagi Grimberg Cc: Or Gerlitz Signed-off-by: Nicholas Bellinger

target: Add DIF related base definitions

2014-01-18T09:52:34Z

This patch adds DIF related definitions to target_core_base.h that includes enums for target_prot_op + target_prot_type + target_prot_version + target_guard_type + target_pi_error. Also included is struct se_dif_v1_tuple, along with changes to struct se_cmd, struct se_dev_attrib, and struct se_device. Also, add new se_subsystem_api->[init,format,free]_prot() callers used by target core code to setup backend specific protection information after the device has been configured. Enums taken from Sagi Grimberg's original patch. v2 changes: - Drop guard_type related definitions - Update target_prot_op + target_prot_ho definitions (Sagi) - Drop SCF_PROT + pi_prot_version flag - Add se_subsystem_api->format_prot() (Sagi) - Add hw_pi_prot_type device attribute Cc: Martin K. Petersen Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Sagi Grimberg Cc: Or Gerlitz Signed-off-by: Nicholas Bellinger