[PATCH rdma-next 4/4] net: mana: Add support for auxiliary device servicing events

Konstantin Taranov
2025-04-14T18:28:50Z

From: Shiraz Saleem <shirazsaleem@microsoft.com>

Handle soc servcing events which require the rdma auxiliary device resources to
be cleaned up during a suspend, and re-initialized during a resume.

Signed-off-by: Shiraz Saleem <shirazsaleem@microsoft.com>
Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
---
.../net/ethernet/microsoft/mana/gdma_main.c | 11 +++-
.../net/ethernet/microsoft/mana/hw_channel.c | 19 ++++++
drivers/net/ethernet/microsoft/mana/mana_en.c | 60 +++++++++++++++++++
include/net/mana/gdma.h | 18 ++++++
include/net/mana/hw_channel.h | 9 +++
5 files changed, 116 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 1caf73c..1d98dd6 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -385,6 +385,7 @@ static void mana_gd_process_eqe(struct gdma_queue *eq)
case GDMA_EQE_HWC_INIT_EQ_ID_DB:
case GDMA_EQE_HWC_INIT_DATA:
case GDMA_EQE_HWC_INIT_DONE:
+ case GDMA_EQE_HWC_SOC_SERVICE:
case GDMA_EQE_RNIC_QP_FATAL:
if (!eq->eq.callback)
break;
@@ -1438,9 +1439,13 @@ static int mana_gd_setup(struct pci_dev *pdev)
mana_gd_init_registers(pdev);
mana_smc_init(&gc->shm_channel, gc->dev, gc->shm_base);

+ gc->service_wq = alloc_ordered_workqueue("gdma_service_wq", 0);
+ if (!gc->service_wq)
+ return -ENOMEM;
+
err = mana_gd_setup_irqs(pdev);
if (err)
- return err;
+ goto free_workqueue;

err = mana_hwc_create_channel(gc);
if (err)
@@ -1464,6 +1469,8 @@ destroy_hwc:
mana_hwc_destroy_channel(gc);
remove_irq:
mana_gd_remove_irqs(pdev);
+free_workqueue:
+ destroy_workqueue(gc->service_wq);
return err;
}

@@ -1474,6 +1481,8 @@ static void mana_gd_cleanup(struct pci_dev *pdev)
mana_hwc_destroy_channel(gc);

mana_gd_remove_irqs(pdev);
+
+ destroy_workqueue(gc->service_wq);
}

static bool mana_is_pf(unsigned short dev_id)
diff --git a/drivers/net/ethernet/microsoft/mana/hw_channel.c b/drivers/net/ethernet/microsoft/mana/hw_channel.c
index a00f915..407b46e 100644
--- a/drivers/net/ethernet/microsoft/mana/hw_channel.c
+++ b/drivers/net/ethernet/microsoft/mana/hw_channel.c
@@ -112,11 +112,13 @@ out:
static void mana_hwc_init_event_handler(void *ctx, struct gdma_queue *q_self,
struct gdma_event *event)
{
+ union hwc_init_soc_service_type service_data;
struct hw_channel_context *hwc = ctx;
struct gdma_dev *gd = hwc->gdma_dev;
union hwc_init_type_data type_data;
union hwc_init_eq_id_db eq_db;
u32 type, val;
+ int ret;

switch (event->type) {
case GDMA_EQE_HWC_INIT_EQ_ID_DB:
@@ -199,7 +201,24 @@ static void mana_hwc_init_event_handler(void *ctx, struct gdma_queue *q_self,
}

break;
+ case GDMA_EQE_HWC_SOC_SERVICE:
+ service_data.as_uint32 = event->details[0];
+ type = service_data.type;
+ val = service_data.value;

+ switch (type) {
+ case GDMA_SERVICE_TYPE_RDMA_SUSPEND:
+ case GDMA_SERVICE_TYPE_RDMA_RESUME:
+ ret = mana_rdma_service_event(gd->gdma_context, type);
+ if (ret)
+ dev_err(hwc->dev, "Failed to schedule adev service event: %d\n", ret);
+ break;
+ default:
+ dev_warn(hwc->dev, "Received unknown SOC service type %u\n", type);
+ break;
+ }
+
+ break;
default:
dev_warn(hwc->dev, "Received unknown gdma event %u\n", event->type);
/* Ignore unknown events, which should never happen. */
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 70c4955..d832700 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -2982,6 +2982,66 @@ idx_fail:
return ret;
}

+static void mana_handle_rdma_servicing(struct work_struct *work)
+{
+ struct mana_service_work *serv_work =
+ container_of(work, struct mana_service_work, work);
+ struct gdma_dev *gd = serv_work->gdma_dev;
+ struct device *dev = gd->gdma_context->dev;
+ int ret;
+
+ switch (serv_work->event) {
+ case GDMA_SERVICE_TYPE_RDMA_SUSPEND:
+ if (!gd->adev || gd->is_suspended)
+ break;
+
+ remove_adev(gd);
+ gd->is_suspended = true;
+ break;
+
+ case GDMA_SERVICE_TYPE_RDMA_RESUME:
+ if (!gd->is_suspended)
+ break;
+
+ ret = add_adev(gd, "rdma");
+ if (ret)
+ dev_err(dev, "Failed to add adev on resume: %d\n", ret);
+ else
+ gd->is_suspended = false;
+ break;
+
+ default:
+ dev_warn(dev, "unknown adev service event %u\n",
+ serv_work->event);
+ break;
+ }
+
+ kfree(serv_work);
+}
+
+int mana_rdma_service_event(struct gdma_context *gc, enum gdma_service_type event)
+{
+ struct gdma_dev *gd = &gc->mana_ib;
+ struct mana_service_work *serv_work;
+
+ if (gd->dev_id.type != GDMA_DEVICE_MANA_IB) {
+ /* RDMA device is not detected on pci */
+ return 0;
+ }
+
+ serv_work = kzalloc(sizeof(*serv_work), GFP_ATOMIC);
+ if (!serv_work)
+ return -ENOMEM;
+
+ serv_work->event = event;
+ serv_work->gdma_dev = gd;
+
+ INIT_WORK(&serv_work->work, mana_handle_rdma_servicing);
+ queue_work(gc->service_wq, &serv_work->work);
+
+ return 0;
+}
+
int mana_probe(struct gdma_dev *gd, bool resuming)
{
struct gdma_context *gc = gd->gdma_context;
diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
index 89abf98..335d061 100644
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -60,6 +60,7 @@ enum gdma_eqe_type {
GDMA_EQE_HWC_INIT_DONE = 131,
GDMA_EQE_HWC_SOC_RECONFIG = 132,
GDMA_EQE_HWC_SOC_RECONFIG_DATA = 133,
+ GDMA_EQE_HWC_SOC_SERVICE = 134,
GDMA_EQE_RNIC_QP_FATAL = 176,
};

@@ -70,6 +71,18 @@ enum {
GDMA_DEVICE_MANA_IB = 3,
};

+enum gdma_service_type {
+ GDMA_SERVICE_TYPE_NONE = 0,
+ GDMA_SERVICE_TYPE_RDMA_SUSPEND = 1,
+ GDMA_SERVICE_TYPE_RDMA_RESUME = 2,
+};
+
+struct mana_service_work {
+ struct work_struct work;
+ struct gdma_dev *gdma_dev;
+ enum gdma_service_type event;
+};
+
struct gdma_resource {
/* Protect the bitmap */
spinlock_t lock;
@@ -224,6 +237,7 @@ struct gdma_dev {
void *driver_data;

struct auxiliary_device *adev;
+ bool is_suspended;
};

/* MANA_PAGE_SIZE is the DMA unit */
@@ -409,6 +423,8 @@ struct gdma_context {
struct gdma_dev mana_ib;

u64 pf_cap_flags1;
+
+ struct workqueue_struct *service_wq;
};

#define MAX_NUM_GDMA_DEVICES 4
@@ -888,4 +904,6 @@ int mana_gd_destroy_dma_region(struct gdma_context *gc, u64 dma_region_handle);
void mana_register_debugfs(void);
void mana_unregister_debugfs(void);

+int mana_rdma_service_event(struct gdma_context *gc, enum gdma_service_type event);
+
#endif /* _GDMA_H */
diff --git a/include/net/mana/hw_channel.h b/include/net/mana/hw_channel.h
index 158b125..83cf933 100644
--- a/include/net/mana/hw_channel.h
+++ b/include/net/mana/hw_channel.h
@@ -49,6 +49,15 @@ union hwc_init_type_data {
};
}; /* HW DATA */

+union hwc_init_soc_service_type {
+ u32 as_uint32;
+
+ struct {
+ u32 value : 28;
+ u32 type : 4;
+ };
+}; /* HW DATA */
+
struct hwc_rx_oob {
u32 type : 6;
u32 eom : 1;
--
2.43.0