[PATCH v6 05/14] net: ionic: Provide interrupt allocation support for the RDMA driver

Abhijit Gangurde
2025-09-03T06:17:54Z

RDMA driver needs an interrupt for an event queue. Export
function from net driver to allocate an interrupt.

Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com>
---
.../net/ethernet/pensando/ionic/ionic_api.h | 43 +++++++++++++++++++
.../net/ethernet/pensando/ionic/ionic_dev.h | 13 ------
.../net/ethernet/pensando/ionic/ionic_lif.c | 38 ++++++++--------
3 files changed, 62 insertions(+), 32 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_api.h b/drivers/net/ethernet/pensando/ionic/ionic_api.h
index e0b766d1769f..5fd23aa8c5a1 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_api.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_api.h
@@ -32,6 +32,29 @@ struct ionic_admin_ctx {
union ionic_adminq_comp comp;
};

+#define IONIC_INTR_INDEX_NOT_ASSIGNED -1
+#define IONIC_INTR_NAME_MAX_SZ 32
+
+/**
+ * struct ionic_intr_info - Interrupt information
+ * @name: Name identifier
+ * @rearm_count: Interrupt rearm count
+ * @index: Interrupt index position
+ * @vector: Interrupt number
+ * @dim_coal_hw: Interrupt coalesce value in hardware units
+ * @affinity_mask: CPU affinity mask
+ * @aff_notify: context for notification of IRQ affinity changes
+ */
+struct ionic_intr_info {
+ char name[IONIC_INTR_NAME_MAX_SZ];
+ u64 rearm_count;
+ unsigned int index;
+ unsigned int vector;
+ u32 dim_coal_hw;
+ cpumask_var_t *affinity_mask;
+ struct irq_affinity_notify aff_notify;
+};
+
/**
* ionic_adminq_post_wait - Post an admin command and wait for response
* @lif: Logical interface
@@ -63,4 +86,24 @@ int ionic_error_to_errno(enum ionic_status_code code);
*/
void ionic_request_rdma_reset(struct ionic_lif *lif);

+/**
+ * ionic_intr_alloc - Reserve a device interrupt
+ * @lif: Logical interface
+ * @intr: Reserved ionic interrupt structure
+ *
+ * Reserve an interrupt index and get irq number for that index.
+ *
+ * Return: zero or negative error status
+ */
+int ionic_intr_alloc(struct ionic_lif *lif, struct ionic_intr_info *intr);
+
+/**
+ * ionic_intr_free - Release a device interrupt index
+ * @lif: Logical interface
+ * @intr: Interrupt index
+ *
+ * Mark the interrupt index unused so that it can be reserved again.
+ */
+void ionic_intr_free(struct ionic_lif *lif, int intr);
+
#endif /* _IONIC_API_H_ */
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
index bc26eb8f5779..68cf4da3c6b3 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -274,19 +274,6 @@ struct ionic_queue {
char name[IONIC_QUEUE_NAME_MAX_SZ];
} ____cacheline_aligned_in_smp;

-#define IONIC_INTR_INDEX_NOT_ASSIGNED -1
-#define IONIC_INTR_NAME_MAX_SZ 32
-
-struct ionic_intr_info {
- char name[IONIC_INTR_NAME_MAX_SZ];
- u64 rearm_count;
- unsigned int index;
- unsigned int vector;
- u32 dim_coal_hw;
- cpumask_var_t *affinity_mask;
- struct irq_affinity_notify aff_notify;
-};
-
struct ionic_cq {
struct ionic_lif *lif;
struct ionic_queue *bound_q;
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 8ed5d2e5fde4..276024002484 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -244,29 +244,36 @@ static int ionic_request_irq(struct ionic_lif *lif, struct ionic_qcq *qcq)
0, intr->name, &qcq->napi);
}

-static int ionic_intr_alloc(struct ionic_lif *lif, struct ionic_intr_info *intr)
+int ionic_intr_alloc(struct ionic_lif *lif, struct ionic_intr_info *intr)
{
struct ionic *ionic = lif->ionic;
- int index;
+ int index, err;

index = find_first_zero_bit(ionic->intrs, ionic->nintrs);
- if (index == ionic->nintrs) {
- netdev_warn(lif->netdev, "%s: no intr, index=%d nintrs=%d\n",
- __func__, index, ionic->nintrs);
+ if (index == ionic->nintrs)
return -ENOSPC;
- }

set_bit(index, ionic->intrs);
ionic_intr_init(&ionic->idev, intr, index);

+ err = ionic_bus_get_irq(ionic, intr->index);
+ if (err < 0) {
+ clear_bit(index, ionic->intrs);
+ return err;
+ }
+
+ intr->vector = err;
+
return 0;
}
+EXPORT_SYMBOL_NS(ionic_intr_alloc, "NET_IONIC");

-static void ionic_intr_free(struct ionic *ionic, int index)
+void ionic_intr_free(struct ionic_lif *lif, int index)
{
- if (index != IONIC_INTR_INDEX_NOT_ASSIGNED && index < ionic->nintrs)
- clear_bit(index, ionic->intrs);
+ if (index != IONIC_INTR_INDEX_NOT_ASSIGNED && index < lif->ionic->nintrs)
+ clear_bit(index, lif->ionic->intrs);
}
+EXPORT_SYMBOL_NS(ionic_intr_free, "NET_IONIC");

static void ionic_irq_aff_notify(struct irq_affinity_notify *notify,
const cpumask_t *mask)
@@ -401,7 +408,7 @@ static void ionic_qcq_intr_free(struct ionic_lif *lif, struct ionic_qcq *qcq)
irq_set_affinity_hint(qcq->intr.vector, NULL);
devm_free_irq(lif->ionic->dev, qcq->intr.vector, &qcq->napi);
qcq->intr.vector = 0;
- ionic_intr_free(lif->ionic, qcq->intr.index);
+ ionic_intr_free(lif, qcq->intr.index);
qcq->intr.index = IONIC_INTR_INDEX_NOT_ASSIGNED;
}

@@ -511,13 +518,6 @@ static int ionic_alloc_qcq_interrupt(struct ionic_lif *lif, struct ionic_qcq *qc
goto err_out;
}

- err = ionic_bus_get_irq(lif->ionic, qcq->intr.index);
- if (err < 0) {
- netdev_warn(lif->netdev, "no vector for %s: %d\n",
- qcq->q.name, err);
- goto err_out_free_intr;
- }
- qcq->intr.vector = err;
ionic_intr_mask_assert(lif->ionic->idev.intr_ctrl, qcq->intr.index,
IONIC_INTR_MASK_SET);

@@ -546,7 +546,7 @@ static int ionic_alloc_qcq_interrupt(struct ionic_lif *lif, struct ionic_qcq *qc
return 0;

err_out_free_intr:
- ionic_intr_free(lif->ionic, qcq->intr.index);
+ ionic_intr_free(lif, qcq->intr.index);
err_out:
return err;
}
@@ -741,7 +741,7 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
err_out_free_irq:
if (flags & IONIC_QCQ_F_INTR) {
devm_free_irq(dev, new->intr.vector, &new->napi);
- ionic_intr_free(lif->ionic, new->intr.index);
+ ionic_intr_free(lif, new->intr.index);
}
err_out_free_page_pool:
page_pool_destroy(new->q.page_pool);
--
2.43.0