On Thu, 13 Jul 2017, 12:19pm, Thomas Bogendoerfer wrote:
> From: Thomas Bogendoerfer <tbogendoerfer@xxxxxxx>
>
> FCOE offloading on qedf devices fails with:
>
> [qed_sp_fcoe_func_start:150(sp-0-3b:00.02)]Cannot satisfy CQ amount. CQs
> requested 8, CQs available 6. Aborting function start
> [qed_fcoe_start:821()]Failed to start fcoe
> [__qedf_probe:3041]:6: Cannot start FCoE function.
>
> The reason is a newly introduced check in the qed main part. This change
> also provides the information about how many CQs are available, so we
> simply limit the number of requested CQs.
>
> Fixes: 3c5da9427802 qed: Share additional information with qedf
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@xxxxxxx>
> ---
> drivers/scsi/qedf/qedf_main.c | 16 +++++++++-------
> 1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
> index b58bba4604e8..5778218734fa 100644
> --- a/drivers/scsi/qedf/qedf_main.c
> +++ b/drivers/scsi/qedf/qedf_main.c
> @@ -2765,6 +2765,8 @@ static int qedf_set_fcoe_pf_param(struct qedf_ctx *qedf)
> */
> qedf->num_queues = min((unsigned int)QEDF_MAX_NUM_CQS,
> num_online_cpus());
> + /* limit to acutal available CQs */
> + qedf->num_queues = min(qedf->num_queues, qedf->dev_info.num_cqs);
We do need to account for the case where there are less CPUs than CQs.
Does this look reasonable:
diff --git a/drivers/scsi/qedf/qedf.h b/drivers/scsi/qedf/qedf.h
index 4d03892..3c1d6fd 100644
--- a/drivers/scsi/qedf/qedf.h
+++ b/drivers/scsi/qedf/qedf.h
@@ -528,7 +528,7 @@ struct fip_vlan {
#define QEDF_WRITE (1 << 0)
#define MAX_FIBRE_LUNS 0xffffffff
-#define QEDF_MAX_NUM_CQS 8
+#define MIN_NUM_CPUS_MSIX(x) min((u32)x->dev_info.num_cqs,
num_online_cpus())
/*
* PCI function probe defines
diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index 937df5b..f4facd3 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -2760,11 +2760,9 @@ static int qedf_set_fcoe_pf_param(struct qedf_ctx
*qedf)
* we allocation is the minimum off:
*
* Number of CPUs
- * Number of MSI-X vectors
- * Max number allocated in hardware (QEDF_MAX_NUM_CQS)
+ * Number allocated by qed for our PCI function
*/
- qedf->num_queues = min((unsigned int)QEDF_MAX_NUM_CQS,
- num_online_cpus());
+ qedf->num_queues = MIN_NUM_CPUS_MSIX(qedf);
Otherwise this patch looks good.
>
> QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Number of CQs is %d.\n",
> qedf->num_queues);
> @@ -2962,6 +2964,13 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
> goto err1;
> }
>
> + /* Learn information crucial for qedf to progress */
> + rc = qed_ops->fill_dev_info(qedf->cdev, &qedf->dev_info);
> + if (rc) {
> + QEDF_ERR(&(qedf->dbg_ctx), "Failed to dev info.\n");
> + goto err1;
> + }
> +
> /* queue allocation code should come here
> * order should be
> * slowpath_start
> @@ -2977,13 +2986,6 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
> }
> qed_ops->common->update_pf_params(qedf->cdev, &qedf->pf_params);
>
> - /* Learn information crucial for qedf to progress */
> - rc = qed_ops->fill_dev_info(qedf->cdev, &qedf->dev_info);
> - if (rc) {
> - QEDF_ERR(&(qedf->dbg_ctx), "Failed to dev info.\n");
> - goto err1;
> - }
> -
> /* Record BDQ producer doorbell addresses */
> qedf->bdq_primary_prod = qedf->dev_info.primary_dbq_rq_addr;
> qedf->bdq_secondary_prod = qedf->dev_info.secondary_bdq_rq_addr;
>
