Re: [PATCH] [SCSI] libsas: Allow expander T-T attachments

James Bottomley
2011-07-28T08:00:20Z

On Wed, 2011-07-27 at 21:19 -0700, Luben Tuikov wrote:
> Allow expander table-to-table attachments for
> expanders that support it.

This is half the code to do SAS 2.0 expanders. You seem to have
additions from the other half (self configuring expanders) see below;
does this mean you have a patch for self configuring expanders in the
works?

> Signed-off-by: Luben Tuikov <ltuikov@yahoo.com>
> ---
> drivers/scsi/libsas/sas_expander.c | 20 ++++++++++++++------
> include/scsi/libsas.h | 3 +++
> include/scsi/sas.h | 14 ++++++++++++--
> 3 files changed, 29 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> index f84084b..e8d0115 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -329,6 +329,7 @@ static void ex_assign_report_general(struct domain_device *dev,
> dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
> dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
> dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
> + dev->ex_dev.t2t_supp = rg->t2t_supp;
> dev->ex_dev.conf_route_table = rg->conf_route_table;
> dev->ex_dev.configuring = rg->configuring;
> memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
> @@ -1133,15 +1134,17 @@ static void sas_print_parent_topology_bug(struct domain_device *child,
> };
> struct domain_device *parent = child->parent;
>
> - sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
> - "has %c:%c routing link!\n",
> + sas_printk("%s ex %016llx (T2T supp:%d) phy 0x%x <--> %s ex %016llx "
> + "(T2T supp:%d) phy 0x%x has %c:%c routing link!\n",
>
> ex_type[parent->dev_type],
> SAS_ADDR(parent->sas_addr),
> + parent->ex_dev.t2t_supp,
> parent_phy->phy_id,
>
> ex_type[child->dev_type],
> SAS_ADDR(child->sas_addr),
> + child->ex_dev.t2t_supp,
> child_phy->phy_id,
>
> ra_char[parent_phy->routing_attr],
> @@ -1238,10 +1241,15 @@ static int sas_check_parent_topology(struct domain_device *child)
> sas_print_parent_topology_bug(child, parent_phy, child_phy);
> res = -ENODEV;
> }
> - } else if (parent_phy->routing_attr == TABLE_ROUTING &&
> - child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
> - sas_print_parent_topology_bug(child, parent_phy, child_phy);
> - res = -ENODEV;
> + } else if (parent_phy->routing_attr == TABLE_ROUTING) {
> + if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
> + (child_phy->routing_attr == TABLE_ROUTING &&
> + child_ex->t2t_supp && parent_ex->t2t_supp)) {
> + /* All good */;
> + } else {
> + sas_print_parent_topology_bug(child, parent_phy, child_phy);
> + res = -ENODEV;
> + }
> }
> break;
> case FANOUT_DEV:
> diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
> index ee86606..793f80b 100644
> --- a/include/scsi/libsas.h
> +++ b/include/scsi/libsas.h
> @@ -142,8 +142,11 @@ struct expander_device {
> u16 ex_change_count;
> u16 max_route_indexes;
> u8 num_phys;
> +
> + u8 t2t_supp:1;
> u8 configuring:1;
> u8 conf_route_table:1;
> +
> u8 enclosure_logical_id[8];
>
> struct ex_phy *ex_phy;
> diff --git a/include/scsi/sas.h b/include/scsi/sas.h
> index e9fd022..f59f182 100644
> --- a/include/scsi/sas.h
> +++ b/include/scsi/sas.h
> @@ -341,7 +341,12 @@ struct report_general_resp {
>
> u8 conf_route_table:1;
> u8 configuring:1;
> - u8 _r_b:6;
> + u8 config_others:1;
> + u8 orej_retry_supp:1;
> + u8 stp_cont_awt:1;
> + u8 self_config:1;
> + u8 zone_config:1;
> + u8 t2t_supp:1;

> u8 _r_c;
>
> @@ -528,7 +533,12 @@ struct report_general_resp {
> u8 _r_a;
> u8 num_phys;
>
> - u8 _r_b:6;
> + u8 t2t_supp:1;
> + u8 zone_config:1;
> + u8 self_config:1;
> + u8 stp_cont_awt:1;
> + u8 orej_retry_supp:1;
> + u8 config_others:1;
> u8 configuring:1;
> u8 conf_route_table:1;
>

These are all SAS2.0 additions to the reserved fields, but you only make
use of one of them.

James