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net: mana: Add handler for hardware servicing events

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To collaborate with hardware servicing events, upon receiving the special
EQE notification from the HW channel, remove the devices on this bus.
Then, after a waiting period based on the device specs, rescan the parent
bus to recover the devices.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: Shradha Gupta <shradhagupta@linux.microsoft.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/1749834034-18498-1-git-send-email-haiyangz@linux.microsoft.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Haiyang Zhang
2025-06-13 10:00:34 -07:00
committed by Jakub Kicinski
parent 7aa3f99156
commit 7768c5f417
2 changed files with 83 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

75
drivers/net/ethernet/microsoft/mana/gdma_main.c
View File

@@ -352,11 +352,59 @@ void mana_gd_ring_cq(struct gdma_queue *cq, u8 arm_bit)
}
EXPORT_SYMBOL_NS(mana_gd_ring_cq, "NET_MANA");
#define MANA_SERVICE_PERIOD 10
struct mana_serv_work {
struct work_struct serv_work;
struct pci_dev *pdev;
};
static void mana_serv_func(struct work_struct *w)
{
struct mana_serv_work *mns_wk;
struct pci_bus *bus, *parent;
struct pci_dev *pdev;
mns_wk = container_of(w, struct mana_serv_work, serv_work);
pdev = mns_wk->pdev;
pci_lock_rescan_remove();
if (!pdev)
goto out;
bus = pdev->bus;
if (!bus) {
dev_err(&pdev->dev, "MANA service: no bus\n");
goto out;
}
parent = bus->parent;
if (!parent) {
dev_err(&pdev->dev, "MANA service: no parent bus\n");
goto out;
}
pci_stop_and_remove_bus_device(bus->self);
msleep(MANA_SERVICE_PERIOD * 1000);
pci_rescan_bus(parent);
out:
pci_unlock_rescan_remove();
pci_dev_put(pdev);
kfree(mns_wk);
module_put(THIS_MODULE);
}
static void mana_gd_process_eqe(struct gdma_queue *eq)
{
u32 head = eq->head % (eq->queue_size / GDMA_EQE_SIZE);
struct gdma_context *gc = eq->gdma_dev->gdma_context;
struct gdma_eqe *eq_eqe_ptr = eq->queue_mem_ptr;
struct mana_serv_work *mns_wk;
union gdma_eqe_info eqe_info;
enum gdma_eqe_type type;
struct gdma_event event;
@@ -401,6 +449,33 @@ static void mana_gd_process_eqe(struct gdma_queue *eq)
eq->eq.callback(eq->eq.context, eq, &event);
break;
case GDMA_EQE_HWC_FPGA_RECONFIG:
dev_info(gc->dev, "Recv MANA service type:%d\n", type);
if (gc->in_service) {
dev_info(gc->dev, "Already in service\n");
break;
}
if (!try_module_get(THIS_MODULE)) {
dev_info(gc->dev, "Module is unloading\n");
break;
}
mns_wk = kzalloc(sizeof(*mns_wk), GFP_ATOMIC);
if (!mns_wk) {
module_put(THIS_MODULE);
break;
}
dev_info(gc->dev, "Start MANA service type:%d\n", type);
gc->in_service = true;
mns_wk->pdev = to_pci_dev(gc->dev);
pci_dev_get(mns_wk->pdev);
INIT_WORK(&mns_wk->serv_work, mana_serv_func);
schedule_work(&mns_wk->serv_work);
break;
default:
break;
}

10
include/net/mana/gdma.h
View File

@@ -58,7 +58,7 @@ enum gdma_eqe_type {
GDMA_EQE_HWC_INIT_EQ_ID_DB = 129,
GDMA_EQE_HWC_INIT_DATA = 130,
GDMA_EQE_HWC_INIT_DONE = 131,
GDMA_EQE_HWC_SOC_RECONFIG = 132,
GDMA_EQE_HWC_FPGA_RECONFIG = 132,
GDMA_EQE_HWC_SOC_RECONFIG_DATA = 133,
GDMA_EQE_HWC_SOC_SERVICE = 134,
GDMA_EQE_RNIC_QP_FATAL = 176,
@@ -403,6 +403,8 @@ struct gdma_context {
u32 test_event_eq_id;
bool is_pf;
bool in_service;
phys_addr_t bar0_pa;
void __iomem *bar0_va;
void __iomem *shm_base;
@@ -578,12 +580,16 @@ enum {
/* Driver can handle holes (zeros) in the device list */
#define GDMA_DRV_CAP_FLAG_1_DEV_LIST_HOLES_SUP BIT(11)
/* Driver can self reset on FPGA Reconfig EQE notification */
#define GDMA_DRV_CAP_FLAG_1_HANDLE_RECONFIG_EQE BIT(17)
#define GDMA_DRV_CAP_FLAGS1 \
(GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT | \
GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX | \
GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG | \
GDMA_DRV_CAP_FLAG_1_VARIABLE_INDIRECTION_TABLE_SUPPORT | \
GDMA_DRV_CAP_FLAG_1_DEV_LIST_HOLES_SUP)
GDMA_DRV_CAP_FLAG_1_DEV_LIST_HOLES_SUP | \
GDMA_DRV_CAP_FLAG_1_HANDLE_RECONFIG_EQE)
#define GDMA_DRV_CAP_FLAGS2 0