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Commit 54a5e73f authored by Laurence Oberman's avatar Laurence Oberman Committed by Nicholas Bellinger
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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: default avatarLaurence Oberman <loberman@redhat.com>
Acked-by: default avatarHimanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent 2b16509c

Documentation/scsi/tcm_qla2xxx.txt

0 → 100644
+22 −0
Original line number Diff line number Diff line 
tcm_qla2xxx jam_host attribute

------------------------------

There is now a new module endpoint atribute called jam_host

attribute: jam_host: boolean=0/1

This attribute and accompanying code is only included if the

Kconfig parameter TCM_QLA2XXX_DEBUG is set to Y

By default this jammer code and functionality is disabled



Use this attribute to control the discarding of SCSI commands to a

selected host.

This may be useful for testing error handling and simulating slow drain

and other fabric issues.



Setting a boolean of 1 for the jam_host attribute for a particular host

 will discard the commands for that host.

Reset back to 0 to stop the jamming.



Enable host 4 to be jammed

echo 1 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host



Disable jamming on host 4

echo 0 > /sys/kernel/config/target/qla2xxx/21:00:00:24:ff:27:8f:ae/tpgt_1/attrib/jam_host

drivers/scsi/qla2xxx/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -36,3 +36,12 @@ config TCM_QLA2XXX 
	default n

	---help---

	Say Y here to enable the TCM_QLA2XXX fabric module for QLogic 24xx+ series target mode HBAs



if TCM_QLA2XXX

config TCM_QLA2XXX_DEBUG

	bool "TCM_QLA2XXX fabric module DEBUG mode for QLogic 24xx+ series target mode HBAs"

	default n

	---help---

	Say Y here to enable the TCM_QLA2XXX fabric module DEBUG for QLogic 24xx+ series target mode HBAs

	This will include code to enable the SCSI command jammer

endif

drivers/scsi/qla2xxx/tcm_qla2xxx.c

+20 −0
Original line number Diff line number Diff line
@@ -442,6 +442,10 @@ static int tcm_qla2xxx_handle_cmd(scsi_qla_host_t *vha, struct qla_tgt_cmd *cmd, 
	struct se_cmd *se_cmd = &cmd->se_cmd;

	struct se_session *se_sess;

	struct qla_tgt_sess *sess;

#ifdef CONFIG_TCM_QLA2XXX_DEBUG

	struct se_portal_group *se_tpg;

	struct tcm_qla2xxx_tpg *tpg;

#endif

	int flags = TARGET_SCF_ACK_KREF;



	if (bidi)
@@ -462,6 +466,15 @@ static int tcm_qla2xxx_handle_cmd(scsi_qla_host_t *vha, struct qla_tgt_cmd *cmd, 
		return -EINVAL;

	}



#ifdef CONFIG_TCM_QLA2XXX_DEBUG

	se_tpg = se_sess->se_tpg;

	tpg = container_of(se_tpg, struct tcm_qla2xxx_tpg, se_tpg);

	if (unlikely(tpg->tpg_attrib.jam_host)) {

		/* return, and dont run target_submit_cmd,discarding command */

		return 0;

	}

#endif



	cmd->vha->tgt_counters.qla_core_sbt_cmd++;

	return target_submit_cmd(se_cmd, se_sess, cdb, &cmd->sense_buffer[0],

				cmd->unpacked_lun, data_length, fcp_task_attr,
@@ -812,6 +825,9 @@ DEF_QLA_TPG_ATTRIB(cache_dynamic_acls); 
DEF_QLA_TPG_ATTRIB(demo_mode_write_protect);

DEF_QLA_TPG_ATTRIB(prod_mode_write_protect);

DEF_QLA_TPG_ATTRIB(demo_mode_login_only);

#ifdef CONFIG_TCM_QLA2XXX_DEBUG

DEF_QLA_TPG_ATTRIB(jam_host);

#endif



static struct configfs_attribute *tcm_qla2xxx_tpg_attrib_attrs[] = {

	&tcm_qla2xxx_tpg_attrib_attr_generate_node_acls,
@@ -819,6 +835,9 @@ static struct configfs_attribute *tcm_qla2xxx_tpg_attrib_attrs[] = { 
	&tcm_qla2xxx_tpg_attrib_attr_demo_mode_write_protect,

	&tcm_qla2xxx_tpg_attrib_attr_prod_mode_write_protect,

	&tcm_qla2xxx_tpg_attrib_attr_demo_mode_login_only,

#ifdef CONFIG_TCM_QLA2XXX_DEBUG

	&tcm_qla2xxx_tpg_attrib_attr_jam_host,

#endif

	NULL,

};
@@ -991,6 +1010,7 @@ static struct se_portal_group *tcm_qla2xxx_make_tpg( 
	tpg->tpg_attrib.demo_mode_write_protect = 1;

	tpg->tpg_attrib.cache_dynamic_acls = 1;

	tpg->tpg_attrib.demo_mode_login_only = 1;

	tpg->tpg_attrib.jam_host = 0;



	ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_FCP);

	if (ret < 0) {

drivers/scsi/qla2xxx/tcm_qla2xxx.h

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ struct tcm_qla2xxx_tpg_attrib { 
	int prod_mode_write_protect;

	int demo_mode_login_only;

	int fabric_prot_type;

	int jam_host;

};



struct tcm_qla2xxx_tpg {