[net-next, v2 08/10] bng_en: Add irq allocation support

[Vikas Gupta <vikas.gupta@broadcom.com>]

Add irq allocation functions. This will help
to allocate IRQs to both netdev and RoCE aux devices.

Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Reviewed-by: Bhargava Chenna Marreddy <bhargava.marreddy@broadcom.com>
Reviewed-by: Rajashekar Hudumula <rajashekar.hudumula@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnge/bnge.h     |  3 +
 .../net/ethernet/broadcom/bnge/bnge_resc.c    | 69 +++++++++++++++++++
 .../net/ethernet/broadcom/bnge/bnge_resc.h    | 13 ++++
 3 files changed, 85 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnge/bnge.h b/drivers/net/ethernet/broadcom/bnge/bnge.h
index b58d8fc6f258..3c161b1a9b62 100644
--- a/drivers/net/ethernet/broadcom/bnge/bnge.h
+++ b/drivers/net/ethernet/broadcom/bnge/bnge.h
@@ -172,6 +172,9 @@ struct bnge_dev {
 #define BNGE_SUPPORTS_TPA(bd)	((bd)->max_tpa_v2)
 
 	u8                      num_tc;
+
+	struct bnge_irq		*irq_tbl;
+	u16			irqs_acquired;
 };
 
 static inline bool bnge_is_roce_en(struct bnge_dev *bd)
diff --git a/drivers/net/ethernet/broadcom/bnge/bnge_resc.c b/drivers/net/ethernet/broadcom/bnge/bnge_resc.c
index 68e094474822..0e67a0001677 100644
--- a/drivers/net/ethernet/broadcom/bnge/bnge_resc.c
+++ b/drivers/net/ethernet/broadcom/bnge/bnge_resc.c
@@ -326,3 +326,72 @@ int bnge_reserve_rings(struct bnge_dev *bd)
 
 	return rc;
 }
+
+int bnge_alloc_irqs(struct bnge_dev *bd)
+{
+	u16 aux_msix, tx_cp, num_entries;
+	int i, irqs_demand, rc;
+	u16 max, min = 1;
+
+	irqs_demand = bnge_nqs_demand(bd);
+	max = bnge_get_max_func_irqs(bd);
+	if (irqs_demand > max)
+		irqs_demand = max;
+
+	if (!(bd->flags & BNGE_EN_SHARED_CHNL))
+		min = 2;
+
+	irqs_demand = pci_alloc_irq_vectors(bd->pdev, min, irqs_demand,
+					    PCI_IRQ_MSIX);
+	aux_msix = bnge_aux_get_msix(bd);
+	if (irqs_demand < 0 || irqs_demand < aux_msix) {
+		rc = -ENODEV;
+		goto err_free_irqs;
+	}
+
+	num_entries = irqs_demand;
+	if (pci_msix_can_alloc_dyn(bd->pdev))
+		num_entries = max;
+	bd->irq_tbl = kcalloc(num_entries, sizeof(*bd->irq_tbl), GFP_KERNEL);
+	if (!bd->irq_tbl) {
+		rc = -ENOMEM;
+		goto err_free_irqs;
+	}
+
+	for (i = 0; i < irqs_demand; i++)
+		bd->irq_tbl[i].vector = pci_irq_vector(bd->pdev, i);
+
+	bd->irqs_acquired = irqs_demand;
+	/* Reduce rings based upon num of vectors allocated.
+	 * We dont need to consider NQs as they have been calculated
+	 * and must be more than irqs_demand.
+	 */
+	rc = bnge_adjust_rings(bd, &bd->rx_nr_rings,
+			       &bd->tx_nr_rings,
+			       irqs_demand - aux_msix, min == 1);
+	if (rc)
+		goto err_free_irqs;
+
+	tx_cp = bnge_num_tx_to_cp(bd, bd->tx_nr_rings);
+	bd->nq_nr_rings = (min == 1) ?
+		max_t(u16, tx_cp, bd->rx_nr_rings) :
+		tx_cp + bd->rx_nr_rings;
+
+	/* Readjust tx_nr_rings_per_tc */
+	if (!bd->num_tc)
+		bd->tx_nr_rings_per_tc = bd->tx_nr_rings;
+
+	return 0;
+
+err_free_irqs:
+	dev_err(bd->dev, "Failed to allocate IRQs err = %d\n", rc);
+	bnge_free_irqs(bd);
+	return rc;
+}
+
+void bnge_free_irqs(struct bnge_dev *bd)
+{
+	pci_free_irq_vectors(bd->pdev);
+	kfree(bd->irq_tbl);
+	bd->irq_tbl = NULL;
+}
diff --git a/drivers/net/ethernet/broadcom/bnge/bnge_resc.h b/drivers/net/ethernet/broadcom/bnge/bnge_resc.h
index c6cef514588f..23db93e03787 100644
--- a/drivers/net/ethernet/broadcom/bnge/bnge_resc.h
+++ b/drivers/net/ethernet/broadcom/bnge/bnge_resc.h
@@ -51,8 +51,21 @@ struct bnge_hw_rings {
 	u16 rss_ctx;
 };
 
+/* "TXRX", 2 hypens, plus maximum integer */
+#define BNGE_IRQ_NAME_EXTRA	17
+struct bnge_irq {
+	irq_handler_t	handler;
+	unsigned int	vector;
+	u8		requested:1;
+	u8		have_cpumask:1;
+	char		name[IFNAMSIZ + BNGE_IRQ_NAME_EXTRA];
+	cpumask_var_t	cpu_mask;
+};
+
 int bnge_reserve_rings(struct bnge_dev *bd);
 int bnge_fix_rings_count(u16 *rx, u16 *tx, u16 max, bool shared);
+int bnge_alloc_irqs(struct bnge_dev *bd);
+void bnge_free_irqs(struct bnge_dev *bd);
 
 static inline u32
 bnge_adjust_pow_two(u32 total_ent, u16 ent_per_blk)
-- 
2.47.1