From 5e2d6764a729bf8d43894b0368b0ae11a19485c0 Mon Sep 17 00:00:00 2001 From: Alex Estrin Date: Mon, 24 Jul 2017 07:46:36 -0700 Subject: [PATCH] IB/hfi1: Verify port data VLs credits on transition to Armed 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 Signed-off-by: Alex Estrin Signed-off-by: Dennis Dalessandro Signed-off-by: Doug Ledford --- drivers/infiniband/hw/hfi1/chip.c | 16 +++++++++++++++- drivers/infiniband/hw/hfi1/intr.c | 1 + 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c index 4a4405ee9302..8f7ce74a15de 100644 --- a/drivers/infiniband/hw/hfi1/chip.c +++ b/drivers/infiniband/hw/hfi1/chip.c @@ -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; diff --git a/drivers/infiniband/hw/hfi1/intr.c b/drivers/infiniband/hw/hfi1/intr.c index 9469be9940e0..96845dfed5c5 100644 --- a/drivers/infiniband/hw/hfi1/intr.c +++ b/drivers/infiniband/hw/hfi1/intr.c @@ -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 */ -- 2.20.1