On 07/14/2015 10:00 PM, Himanshu Madhani wrote:
> From: Roland Dreier <rol...@purestorage.com>
>
> To fix some issues talking to ESX, this patch modifies the qla2xxx driver
> so that it never logs into remote ports. This has the side effect of
> getting rid of the "rports" entirely, which means we never log out of
> initiators and never tear down sessions when an initiator goes away.
>
> This is mostly OK, except that we can run into trouble if we have
> initiator A assigned FC address X:Y:Z by the fabric talking to us, and
> then initiator A goes away. Some time (could be a long time) later,
> initiator B comes along and also gets FC address X:Y:Z (which is
> available again, because initiator A is gone). If initiator B starts
> talking to us, then we'll still have the session for initiator A, and
> since we look up incoming IO based on the FC address X:Y:Z, initiator B
> will end up using ACLs for initiator A.
>
> Fix this by:
>
> 1. Handling RSCN events somewhat differently; instead of completely
> skipping the processing of fcports, we look through the list, and if
> an fcport disappears, we tell the target code the tear down the
> session and tell the HBA FW to release the N_Port handle.
>
> 2. Handling "port down" events by flushing all of our sessions. The
> firmware was already releasing the N_Port handle but we want the
> target code to drop all the sessions too.
>
> Cc: <sta...@vger.kernel.org>
> Signed-off-by: Roland Dreier <rol...@purestorage.com>
> Signed-off-by: Alexei Potashnik <ale...@purestorage.com>
> Acked-by: Quinn Tran <quinn.t...@qlogic.com>
> Signed-off-by: Himanshu Madhani <himanshu.madh...@qlogic.com>
> ---
> drivers/scsi/qla2xxx/qla_dbg.c | 2 +-
> drivers/scsi/qla2xxx/qla_init.c | 137
> ++++++++++++++++++++++++++++++-------
> drivers/scsi/qla2xxx/qla_target.c | 9 ++-
> 3 files changed, 117 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/scsi/qla2xxx/qla_dbg.c b/drivers/scsi/qla2xxx/qla_dbg.c
> index 0e6ee3c..e9ae6b9 100644
> --- a/drivers/scsi/qla2xxx/qla_dbg.c
> +++ b/drivers/scsi/qla2xxx/qla_dbg.c
> @@ -68,7 +68,7 @@
> * | | | 0xd101-0xd1fe
> |
> * | | | 0xd214-0xd2fe
> |
> * | Target Mode | 0xe079 | |
> - * | Target Mode Management | 0xf072 | 0xf002 |
> + * | Target Mode Management | 0xf080 | 0xf002 |
> * | | | 0xf046-0xf049 |
> * | Target Mode Task Management | 0x1000b | |
> * ----------------------------------------------------------------------
> diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
> index 766fdfc..4895a4a 100644
> --- a/drivers/scsi/qla2xxx/qla_init.c
> +++ b/drivers/scsi/qla2xxx/qla_init.c
> @@ -3462,20 +3462,43 @@ qla2x00_configure_fabric(scsi_qla_host_t *vha)
> if ((fcport->flags & FCF_FABRIC_DEVICE) == 0)
> continue;
>
> - if (fcport->scan_state == QLA_FCPORT_SCAN &&
> - atomic_read(&fcport->state) == FCS_ONLINE) {
> - qla2x00_mark_device_lost(vha, fcport,
> - ql2xplogiabsentdevice, 0);
> - if (fcport->loop_id != FC_NO_LOOP_ID &&
> - (fcport->flags & FCF_FCP2_DEVICE) == 0 &&
> - fcport->port_type != FCT_INITIATOR &&
> - fcport->port_type != FCT_BROADCAST) {
> - ha->isp_ops->fabric_logout(vha,
> - fcport->loop_id,
> - fcport->d_id.b.domain,
> - fcport->d_id.b.area,
> - fcport->d_id.b.al_pa);
> - qla2x00_clear_loop_id(fcport);
> + if (fcport->scan_state == QLA_FCPORT_SCAN) {
> + if (qla_ini_mode_enabled(base_vha) &&
> + atomic_read(&fcport->state) == FCS_ONLINE) {
> + qla2x00_mark_device_lost(vha, fcport,
> + ql2xplogiabsentdevice, 0);
> + if (fcport->loop_id != FC_NO_LOOP_ID &&
> + (fcport->flags & FCF_FCP2_DEVICE)
> == 0 &&
> + fcport->port_type != FCT_INITIATOR
> &&
> + fcport->port_type != FCT_BROADCAST)
> {
> + ha->isp_ops->fabric_logout(vha,
> + fcport->loop_id,
> + fcport->d_id.b.domain,
> + fcport->d_id.b.area,
> + fcport->d_id.b.al_pa);
> + qla2x00_clear_loop_id(fcport);
> + }
> + } else if (!qla_ini_mode_enabled(base_vha)) {
> + /*
> + * In target mode, explicitly kill
> + * sessions and log out of devices
> + * that are gone, so that we don't
> + * end up with an initiator using the
> + * wrong ACL (if the fabric recycles
> + * an FC address and we have a stale
> + * session around) and so that we don't
> + * report initiators that are no longer
> + * on the fabric.
> + */
> + ql_dbg(ql_dbg_tgt_mgt, vha, 0xf077,
> + "port gone, logging out/killing
> session: "
> + "%8phC state 0x%x flags 0x%x
> fc4_type 0x%x "
> + "scan_state %d\n",
> + fcport->port_name,
> + atomic_read(&fcport->state),
> + fcport->flags, fcport->fc4_type,
> + fcport->scan_state);
> + qlt_fc_port_deleted(vha, fcport);
> }
> }
> }
> @@ -3496,6 +3519,28 @@ qla2x00_configure_fabric(scsi_qla_host_t *vha)
> (fcport->flags & FCF_LOGIN_NEEDED) == 0)
> continue;
>
> + /*
> + * If we're not an initiator, skip looking for devices
> + * and logging in. There's no reason for us to do it,
> + * and it seems to actively cause problems in target
> + * mode if we race with the initiator logging into us
> + * (we might get the "port ID used" status back from
> + * our login command and log out the initiator, which
> + * seems to cause havoc).
> + */
> + if (!qla_ini_mode_enabled(base_vha)) {
> + if (fcport->scan_state == QLA_FCPORT_FOUND) {
> + ql_dbg(ql_dbg_tgt_mgt, vha, 0xf078,
> + "port %8phC state 0x%x flags 0x%x
> fc4_type 0x%x "
> + "scan_state %d (initiator mode
> disabled; skipping "
> + "login)\n", fcport->port_name,
> + atomic_read(&fcport->state),
> + fcport->flags, fcport->fc4_type,
> + fcport->scan_state);
> + }
> + continue;
> + }
> +
> if (fcport->loop_id == FC_NO_LOOP_ID) {
> fcport->loop_id = next_loopid;
> rval = qla2x00_find_new_loop_id(
> @@ -3522,16 +3567,38 @@ qla2x00_configure_fabric(scsi_qla_host_t *vha)
> test_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags))
> break;
>
> - /* Find a new loop ID to use. */
> - fcport->loop_id = next_loopid;
> - rval = qla2x00_find_new_loop_id(base_vha, fcport);
> - if (rval != QLA_SUCCESS) {
> - /* Ran out of IDs to use */
> - break;
> - }
> + /*
> + * If we're not an initiator, skip looking for devices
> + * and logging in. There's no reason for us to do it,
> + * and it seems to actively cause problems in target
> + * mode if we race with the initiator logging into us
> + * (we might get the "port ID used" status back from
> + * our login command and log out the initiator, which
> + * seems to cause havoc).
> + */
> + if (qla_ini_mode_enabled(base_vha)) {
> + /* Find a new loop ID to use. */
> + fcport->loop_id = next_loopid;
> + rval = qla2x00_find_new_loop_id(base_vha,
> + fcport);
> + if (rval != QLA_SUCCESS) {
> + /* Ran out of IDs to use */
> + break;
> + }
>
> - /* Login and update database */
> - qla2x00_fabric_dev_login(vha, fcport, &next_loopid);
> + /* Login and update database */
> + qla2x00_fabric_dev_login(vha, fcport,
> + &next_loopid);
> + } else {
> + ql_dbg(ql_dbg_tgt_mgt, vha, 0xf079,
> + "new port %8phC state 0x%x flags 0x%x
> fc4_type "
> + "0x%x scan_state %d (initiator mode
> disabled; "
> + "skipping login)\n",
> + fcport->port_name,
> + atomic_read(&fcport->state),
> + fcport->flags, fcport->fc4_type,
> + fcport->scan_state);
> + }
>
> list_move_tail(&fcport->list, &vha->vp_fcports);
> }
> @@ -3727,11 +3794,12 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *vha,
> fcport->fp_speed = new_fcport->fp_speed;
>
> /*
> - * If address the same and state FCS_ONLINE, nothing
> - * changed.
> + * If address the same and state FCS_ONLINE
> + * (or in target mode), nothing changed.
> */
> if (fcport->d_id.b24 == new_fcport->d_id.b24 &&
> - atomic_read(&fcport->state) == FCS_ONLINE) {
> + (atomic_read(&fcport->state) == FCS_ONLINE ||
> + !qla_ini_mode_enabled(base_vha))) {
> break;
> }
>
> @@ -3751,6 +3819,22 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *vha,
> * Log it out if still logged in and mark it for
> * relogin later.
> */
> + if (!qla_ini_mode_enabled(base_vha)) {
> + ql_dbg(ql_dbg_tgt_mgt, vha, 0xf080,
> + "port changed FC ID, %8phC"
> + " old %x:%x:%x (loop_id 0x%04x)-> new
> %x:%x:%x\n",
> + fcport->port_name,
> + fcport->d_id.b.domain,
> + fcport->d_id.b.area,
> + fcport->d_id.b.al_pa,
> + fcport->loop_id,
> + new_fcport->d_id.b.domain,
> + new_fcport->d_id.b.area,
> + new_fcport->d_id.b.al_pa);
> + fcport->d_id.b24 = new_fcport->d_id.b24;
> + break;
> + }
> +
> fcport->d_id.b24 = new_fcport->d_id.b24;
> fcport->flags |= FCF_LOGIN_NEEDED;
> if (fcport->loop_id != FC_NO_LOOP_ID &&
> @@ -3770,6 +3854,7 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *vha,
> if (found)
> continue;
> /* If device was not in our fcports list, then add it. */
> + new_fcport->scan_state = QLA_FCPORT_FOUND;
> list_add_tail(&new_fcport->list, new_fcports);
>
> /* Allocate a new replacement fcport. */
> diff --git a/drivers/scsi/qla2xxx/qla_target.c
> b/drivers/scsi/qla2xxx/qla_target.c
> index 52d8f10..97b42c0 100644
> --- a/drivers/scsi/qla2xxx/qla_target.c
> +++ b/drivers/scsi/qla2xxx/qla_target.c
> @@ -113,6 +113,7 @@ static void qlt_abort_cmd_on_host_reset(struct
> scsi_qla_host *vha,
> static void qlt_alloc_qfull_cmd(struct scsi_qla_host *vha,
> struct atio_from_isp *atio, uint16_t status, int qfull);
> static void qlt_disable_vha(struct scsi_qla_host *vha);
> +static void qlt_clear_tgt_db(struct qla_tgt *tgt);
> /*
> * Global Variables
> */
> @@ -431,10 +432,10 @@ static int qlt_reset(struct scsi_qla_host *vha, void
> *iocb, int mcmd)
>
> loop_id = le16_to_cpu(n->u.isp24.nport_handle);
> if (loop_id == 0xFFFF) {
> -#if 0 /* FIXME: Re-enable Global event handling.. */
> /* Global event */
> - atomic_inc(&ha->tgt.qla_tgt->tgt_global_resets_count);
> - qlt_clear_tgt_db(ha->tgt.qla_tgt);
> + atomic_inc(&vha->vha_tgt.qla_tgt->tgt_global_resets_count);
> + qlt_clear_tgt_db(vha->vha_tgt.qla_tgt);
> +#if 0 /* FIXME: do we need to choose a session here? */
> if (!list_empty(&ha->tgt.qla_tgt->sess_list)) {
> sess = list_entry(ha->tgt.qla_tgt->sess_list.next,
> typeof(*sess), sess_list_entry);
Hmm? What happened to the original FIXME?
Is it not required anymore?
I guess this warrants a separate patch.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
h...@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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