tcm_qla2xxx Add SCSI command jammer/discard capability
This patch introduces support for TCM_QLA2XXX_DEBUG and associated tcm_qla2xxx_tpg->tpg_attrib.jam_host checking used to test dropped packets to FC host environments. Tested by: Laurence Oberman <loberman@redhat.com> Signed-off-by: Laurence Oberman <loberman@redhat.com> Acked-by: Himanshu Madhani <himanshu.madhani@qlogic.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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Documentation/scsi/tcm_qla2xxx.txt
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22
Documentation/scsi/tcm_qla2xxx.txt
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@ -0,0 +1,22 @@
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tcm_qla2xxx jam_host attribute
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------------------------------
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There is now a new module endpoint atribute called jam_host
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attribute: jam_host: boolean=0/1
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This attribute and accompanying code is only included if the
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Kconfig parameter TCM_QLA2XXX_DEBUG is set to Y
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By default this jammer code and functionality is disabled
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Use this attribute to control the discarding of SCSI commands to a
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selected host.
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This may be useful for testing error handling and simulating slow drain
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and other fabric issues.
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Setting a boolean of 1 for the jam_host attribute for a particular host
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will discard the commands for that host.
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Reset back to 0 to stop the jamming.
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Enable host 4 to be jammed
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echo 1 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host
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Disable jamming on host 4
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echo 0 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host
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@ -36,3 +36,12 @@ config TCM_QLA2XXX
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default n
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---help---
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Say Y here to enable the TCM_QLA2XXX fabric module for QLogic 24xx+ series target mode HBAs
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if TCM_QLA2XXX
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config TCM_QLA2XXX_DEBUG
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bool "TCM_QLA2XXX fabric module DEBUG mode for QLogic 24xx+ series target mode HBAs"
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default n
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---help---
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Say Y here to enable the TCM_QLA2XXX fabric module DEBUG for QLogic 24xx+ series target mode HBAs
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This will include code to enable the SCSI command jammer
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endif
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@ -442,6 +442,10 @@ static int tcm_qla2xxx_handle_cmd(scsi_qla_host_t *vha, struct qla_tgt_cmd *cmd,
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struct se_cmd *se_cmd = &cmd->se_cmd;
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struct se_session *se_sess;
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struct qla_tgt_sess *sess;
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#ifdef CONFIG_TCM_QLA2XXX_DEBUG
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struct se_portal_group *se_tpg;
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struct tcm_qla2xxx_tpg *tpg;
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#endif
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int flags = TARGET_SCF_ACK_KREF;
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if (bidi)
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@ -462,6 +466,15 @@ static int tcm_qla2xxx_handle_cmd(scsi_qla_host_t *vha, struct qla_tgt_cmd *cmd,
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return -EINVAL;
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}
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#ifdef CONFIG_TCM_QLA2XXX_DEBUG
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se_tpg = se_sess->se_tpg;
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tpg = container_of(se_tpg, struct tcm_qla2xxx_tpg, se_tpg);
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if (unlikely(tpg->tpg_attrib.jam_host)) {
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/* return, and dont run target_submit_cmd,discarding command */
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return 0;
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}
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#endif
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cmd->vha->tgt_counters.qla_core_sbt_cmd++;
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return target_submit_cmd(se_cmd, se_sess, cdb, &cmd->sense_buffer[0],
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cmd->unpacked_lun, data_length, fcp_task_attr,
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@ -812,6 +825,9 @@ DEF_QLA_TPG_ATTRIB(cache_dynamic_acls);
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DEF_QLA_TPG_ATTRIB(demo_mode_write_protect);
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DEF_QLA_TPG_ATTRIB(prod_mode_write_protect);
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DEF_QLA_TPG_ATTRIB(demo_mode_login_only);
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#ifdef CONFIG_TCM_QLA2XXX_DEBUG
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DEF_QLA_TPG_ATTRIB(jam_host);
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#endif
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static struct configfs_attribute *tcm_qla2xxx_tpg_attrib_attrs[] = {
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&tcm_qla2xxx_tpg_attrib_attr_generate_node_acls,
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@ -819,6 +835,9 @@ static struct configfs_attribute *tcm_qla2xxx_tpg_attrib_attrs[] = {
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&tcm_qla2xxx_tpg_attrib_attr_demo_mode_write_protect,
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&tcm_qla2xxx_tpg_attrib_attr_prod_mode_write_protect,
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&tcm_qla2xxx_tpg_attrib_attr_demo_mode_login_only,
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#ifdef CONFIG_TCM_QLA2XXX_DEBUG
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&tcm_qla2xxx_tpg_attrib_attr_jam_host,
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#endif
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NULL,
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};
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@ -991,6 +1010,7 @@ static struct se_portal_group *tcm_qla2xxx_make_tpg(
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tpg->tpg_attrib.demo_mode_write_protect = 1;
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tpg->tpg_attrib.cache_dynamic_acls = 1;
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tpg->tpg_attrib.demo_mode_login_only = 1;
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tpg->tpg_attrib.jam_host = 0;
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ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_FCP);
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if (ret < 0) {
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@ -34,6 +34,7 @@ struct tcm_qla2xxx_tpg_attrib {
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int prod_mode_write_protect;
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int demo_mode_login_only;
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int fabric_prot_type;
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int jam_host;
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};
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struct tcm_qla2xxx_tpg {
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