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IB/hfi1: Verify port data VLs credits on transition to Armed

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There is a window where the FM can read the buffer control table
and decide not to program buffers. When a port goes down, the code
clears the table and if it is not programmed, posted SDMA descriptors
will never complete due to no buffer credits.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Alex Estrin <alex.estrin@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Alex Estrin 2017-07-24 07:46:36 -07:00 committed by Doug Ledford
parent a618b7e40a
commit 5e2d6764a7
2 changed files with 16 additions and 1 deletions
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16
drivers/infiniband/hw/hfi1/chip.c
View File

@ -10489,6 +10489,14 @@ void set_link_down_reason(struct hfi1_pportdata *ppd, u8 lcl_reason,
}
}
/*
* Verify if BCT for data VLs is non-zero.
*/
static inline bool data_vls_operational(struct hfi1_pportdata *ppd)
{
return !!ppd->actual_vls_operational;
}
/*
* Change the physical and/or logical link state.
*
@ -10587,6 +10595,13 @@ int set_link_state(struct hfi1_pportdata *ppd, u32 state)
if (ppd->host_link_state != HLS_UP_INIT)
goto unexpected;
if (!data_vls_operational(ppd)) {
dd_dev_err(dd,
"%s: data VLs not operational\n", __func__);
ret = -EINVAL;
break;
}
ppd->host_link_state = HLS_UP_ARMED;
set_logical_state(dd, LSTATE_ARMED);
ret = wait_logical_linkstate(ppd, IB_PORT_ARMED, 1000);
@ -14832,7 +14847,6 @@ struct hfi1_devdata *hfi1_init_dd(struct pci_dev *pdev,
}
ppd->vls_supported = num_vls;
ppd->vls_operational = ppd->vls_supported;
ppd->actual_vls_operational = ppd->vls_supported;
/* Set the default MTU. */
for (vl = 0; vl < num_vls; vl++)
dd->vld[vl].mtu = hfi1_max_mtu;

1
drivers/infiniband/hw/hfi1/intr.c
View File

@ -164,6 +164,7 @@ void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup)
ppd->linkup = 0;
/* clear HW details of the previous connection */
ppd->actual_vls_operational = 0;
reset_link_credits(dd);
/* freeze after a link down to guarantee a clean egress */