[PATCH net-next v6 5/6] net: mana: Allocate interrupt context for each EQ when creating vPort

Long Li
2026-04-29T22:16:38Z

Use GIC functions to create a dedicated interrupt context or acquire a
shared interrupt context for each EQ when setting up a vPort.

Signed-off-by: Long Li <longli@microsoft.com>
---
drivers/net/ethernet/microsoft/mana/gdma_main.c | 2 +-
drivers/net/ethernet/microsoft/mana/mana_en.c | 17 ++++++++++++++++-
include/net/mana/gdma.h | 1 +
3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index ce433a68938f..ccecf2adcfe6 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -851,7 +851,6 @@ static void mana_gd_deregister_irq(struct gdma_queue *queue)
}
spin_unlock_irqrestore(&gic->lock, flags);

- queue->eq.msix_index = INVALID_PCI_MSIX_INDEX;
synchronize_rcu();
}

@@ -966,6 +965,7 @@ static int mana_gd_create_eq(struct gdma_dev *gd,
out:
dev_err(dev, "Failed to create EQ: %d\n", err);
mana_gd_destroy_eq(gc, false, queue);
+ queue->eq.msix_index = INVALID_PCI_MSIX_INDEX;
return err;
}

diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index e7f734994b5e..15dcfb009ef0 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -1619,6 +1619,7 @@ void mana_destroy_eq(struct mana_port_context *apc)
struct gdma_context *gc = ac->gdma_dev->gdma_context;
struct gdma_queue *eq;
int i;
+ unsigned int msi;

if (!apc->eqs)
return;
@@ -1631,7 +1632,9 @@ void mana_destroy_eq(struct mana_port_context *apc)
if (!eq)
continue;

+ msi = eq->eq.msix_index;
mana_gd_destroy_queue(gc, eq);
+ mana_gd_put_gic(gc, !gc->msi_sharing, msi);
}

kfree(apc->eqs);
@@ -1648,6 +1651,7 @@ static void mana_create_eq_debugfs(struct mana_port_context *apc, int i)
eq.mana_eq_debugfs = debugfs_create_dir(eqnum, apc->mana_eqs_debugfs);
debugfs_create_u32("head", 0400, eq.mana_eq_debugfs, &eq.eq->head);
debugfs_create_u32("tail", 0400, eq.mana_eq_debugfs, &eq.eq->tail);
+ debugfs_create_u32("irq", 0400, eq.mana_eq_debugfs, &eq.eq->eq.irq);
debugfs_create_file("eq_dump", 0400, eq.mana_eq_debugfs, eq.eq, &mana_dbg_q_fops);
}

@@ -1658,6 +1662,7 @@ int mana_create_eq(struct mana_port_context *apc)
struct gdma_queue_spec spec = {};
int err;
int i;
+ struct gdma_irq_context *gic;

WARN_ON(apc->eqs);
apc->eqs = kzalloc_objs(struct mana_eq, apc->num_queues);
@@ -1674,12 +1679,22 @@ int mana_create_eq(struct mana_port_context *apc)
apc->mana_eqs_debugfs = debugfs_create_dir("EQs", apc->mana_port_debugfs);

for (i = 0; i < apc->num_queues; i++) {
- spec.eq.msix_index = (i + 1) % gc->num_msix_usable;
+ if (gc->msi_sharing)
+ spec.eq.msix_index = (i + 1) % gc->num_msix_usable;
+
+ gic = mana_gd_get_gic(gc, !gc->msi_sharing, &spec.eq.msix_index);
+ if (!gic) {
+ err = -ENOMEM;
+ goto out;
+ }
+
err = mana_gd_create_mana_eq(gd, &spec, &apc->eqs[i].eq);
if (err) {
dev_err(gc->dev, "Failed to create EQ %d : %d\n", i, err);
+ mana_gd_put_gic(gc, !gc->msi_sharing, spec.eq.msix_index);
goto out;
}
+ apc->eqs[i].eq->eq.irq = gic->irq;
mana_create_eq_debugfs(apc, i);
}

diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
index 690208a26121..240d7f1c0733 100644
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -342,6 +342,7 @@ struct gdma_queue {
void *context;

unsigned int msix_index;
+ unsigned int irq;

u32 log2_throttle_limit;
} eq;
--
2.43.0