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Thu, 9 Mar 2023 22:33:24 +0000 Received: from DM5PR10MB1466.namprd10.prod.outlook.com ([fe80::7dd7:8d22:104:8d64]) by DM5PR10MB1466.namprd10.prod.outlook.com ([fe80::7dd7:8d22:104:8d64%7]) with mapi id 15.20.6178.019; Thu, 9 Mar 2023 22:33:24 +0000 From: Mike Christie To: mlombard@redhat.com, martin.petersen@oracle.com, mgurtovoy@nvidia.com, sagi@grimberg.me, d.bogdanov@yadro.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Cc: Mike Christie Subject: [PATCH 07/18] scsi: target: Treat CMD_T_FABRIC_STOP like CMD_T_STOP Date: Thu, 9 Mar 2023 16:33:01 -0600 Message-Id: <20230309223312.94595-8-michael.christie@oracle.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230309223312.94595-1-michael.christie@oracle.com> References: <20230309223312.94595-1-michael.christie@oracle.com> X-ClientProxiedBy: DM6PR03CA0037.namprd03.prod.outlook.com (2603:10b6:5:100::14) To DM5PR10MB1466.namprd10.prod.outlook.com (2603:10b6:3:b::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM5PR10MB1466:EE_|PH8PR10MB6479:EE_ X-MS-Office365-Filtering-Correlation-Id: 4540be1c-4cea-4421-46a4-08db20ee4b9d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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It will then loop over running commands and wait for LIO core to complete them or clean them up if they were on an internal queue waiting to be sent or ackd. Currently, CMD_T_FABRIC_STOP only stops TMRs from operating on the command but for isert we need to prevent LIO core from calling into iscsit callouts when the connection is being brought down. If LIO core queues commands to iscsit and it ends up adding to an internal queue instead of passing back to the driver then we can end up hanging waiting on command completion that never occurs because it's stuck on the internal list (the tx thread is stopped at this time, so it will never loop over the response list and call into isert). We also want to sync up on a point where we no longer call into isert so it can cleanup it's structs. This has LIO core treat CMD_T_FABRIC_STOP like CMD_T_STOP during command execution and also fixes the locking around the target_cmd_interrupted calls so fabric modules can make sure cmds are never marked both CMD_T_COMPLETE and CMD_T_STOP|CMD_T_FABRIC_STOP. Signed-off-by: Mike Christie --- drivers/target/target_core_sbc.c | 2 +- drivers/target/target_core_transport.c | 27 +++++++++++++++----------- 2 files changed, 17 insertions(+), 12 deletions(-) diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index c1cf37a1b4ce..ff1ae779543f 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -457,7 +457,7 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes * we don't have to perform the write operation. */ WARN_ON(!(cmd->transport_state & - (CMD_T_ABORTED | CMD_T_STOP))); + (CMD_T_ABORTED | CMD_T_STOP | CMD_T_FABRIC_STOP))); goto out; } /* diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 86adff2a86ed..1c23079a5d7f 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -737,8 +737,8 @@ static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) * Determine if frontend context caller is requesting the stopping of * this command for frontend exceptions. */ - if (cmd->transport_state & CMD_T_STOP) { - pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", + if (cmd->transport_state & (CMD_T_STOP | CMD_T_FABRIC_STOP)) { + pr_debug("%s:%d CMD_T_STOP|CMD_T_FABRIC_STOP for ITT: 0x%08llx\n", __func__, __LINE__, cmd->tag); spin_unlock_irqrestore(&cmd->t_state_lock, flags); @@ -889,7 +889,7 @@ static bool target_cmd_interrupted(struct se_cmd *cmd) INIT_WORK(&cmd->work, target_abort_work); queue_work(target_completion_wq, &cmd->work); return true; - } else if (cmd->transport_state & CMD_T_STOP) { + } else if (cmd->transport_state & (CMD_T_STOP | CMD_T_FABRIC_STOP)) { if (cmd->transport_complete_callback) cmd->transport_complete_callback(cmd, false, &post_ret); complete_all(&cmd->t_transport_stop_comp); @@ -907,13 +907,15 @@ void target_complete_cmd_with_sense(struct se_cmd *cmd, u8 scsi_status, int success, cpu; unsigned long flags; - if (target_cmd_interrupted(cmd)) + spin_lock_irqsave(&cmd->t_state_lock, flags); + if (target_cmd_interrupted(cmd)) { + spin_unlock_irqrestore(&cmd->t_state_lock, flags); return; + } cmd->scsi_status = scsi_status; cmd->sense_reason = sense_reason; - spin_lock_irqsave(&cmd->t_state_lock, flags); switch (cmd->scsi_status) { case SAM_STAT_CHECK_CONDITION: if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) @@ -2277,10 +2279,12 @@ void target_execute_cmd(struct se_cmd *cmd) * * If the received CDB has already been aborted stop processing it here. */ - if (target_cmd_interrupted(cmd)) + spin_lock_irq(&cmd->t_state_lock); + if (target_cmd_interrupted(cmd)) { + spin_unlock_irq(&cmd->t_state_lock); return; + } - spin_lock_irq(&cmd->t_state_lock); cmd->t_state = TRANSPORT_PROCESSING; cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; spin_unlock_irq(&cmd->t_state_lock); @@ -2847,9 +2851,9 @@ transport_generic_new_cmd(struct se_cmd *cmd) * Determine if frontend context caller is requesting the stopping of * this command for frontend exceptions. */ - if (cmd->transport_state & CMD_T_STOP && + if (cmd->transport_state & (CMD_T_STOP | CMD_T_FABRIC_STOP) && !cmd->se_tfo->write_pending_must_be_called) { - pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", + pr_debug("%s:%d CMD_T_STOP|CMD_T_FABRIC_STOPfor ITT: 0x%08llx\n", __func__, __LINE__, cmd->tag); spin_unlock_irqrestore(&cmd->t_state_lock, flags); @@ -2880,11 +2884,12 @@ static void transport_write_pending_qf(struct se_cmd *cmd) bool stop; spin_lock_irqsave(&cmd->t_state_lock, flags); - stop = (cmd->transport_state & (CMD_T_STOP | CMD_T_ABORTED)); + stop = (cmd->transport_state & + (CMD_T_STOP | CMD_T_FABRIC_STOP | CMD_T_ABORTED)); spin_unlock_irqrestore(&cmd->t_state_lock, flags); if (stop) { - pr_debug("%s:%d CMD_T_STOP|CMD_T_ABORTED for ITT: 0x%08llx\n", + pr_debug("%s:%d CMD_T_STOP|CMD_T_FABRIC_STOP|CMD_T_ABORTED for ITT: 0x%08llx\n", __func__, __LINE__, cmd->tag); complete_all(&cmd->t_transport_stop_comp); return;