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Message-Id: <1746832603-4340-1-git-send-email-haiyangz@microsoft.com> Date: Fri, 9 May 2025 16:16:43 -0700 From: Haiyang Zhang <haiyangz@...rosoft.com> To: linux-hyperv@...r.kernel.org, netdev@...r.kernel.org Cc: haiyangz@...rosoft.com, decui@...rosoft.com, stephen@...workplumber.org, kys@...rosoft.com, paulros@...rosoft.com, olaf@...fle.de, vkuznets@...hat.com, davem@...emloft.net, wei.liu@...nel.org, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, leon@...nel.org, longli@...rosoft.com, ssengar@...ux.microsoft.com, linux-rdma@...r.kernel.org, daniel@...earbox.net, john.fastabend@...il.com, bpf@...r.kernel.org, ast@...nel.org, hawk@...nel.org, tglx@...utronix.de, shradhagupta@...ux.microsoft.com, andrew+netdev@...n.ch, linux-kernel@...r.kernel.org Subject: [PATCH net-next,v2] net: mana: Add handler for hardware servicing events 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@...rosoft.com> --- v2: Added dev_dbg for service type as suggested by Shradha Gupta. Added driver cap bit. --- .../net/ethernet/microsoft/mana/gdma_main.c | 63 +++++++++++++++++++ include/net/mana/gdma.h | 11 +++- 2 files changed, 72 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c index 4ffaf7588885..cf82c9a36c8e 100644 --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c @@ -352,11 +352,52 @@ 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 = container_of(w, struct mana_serv_work, serv_work); + struct pci_dev *pdev = mns_wk->pdev; + struct pci_bus *bus, *parent; + + 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_locked(bus->self); + + msleep(MANA_SERVICE_PERIOD * 1000); + + pci_lock_rescan_remove(); + pci_rescan_bus(parent); + pci_unlock_rescan_remove(); + +out: + kfree(mns_wk); +} + 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; @@ -400,6 +441,28 @@ 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: + case GDMA_EQE_HWC_SOCMANA_CRASH: + dev_dbg(gc->dev, "Recv MANA service type:%d\n", type); + + if (gc->in_service) { + dev_info(gc->dev, "Already in service\n"); + break; + } + + mns_wk = kzalloc(sizeof(*mns_wk), GFP_ATOMIC); + if (!mns_wk) { + dev_err(gc->dev, "Fail to alloc mana_serv_work\n"); + break; + } + + dev_info(gc->dev, "Start MANA service type:%d\n", type); + gc->in_service = true; + mns_wk->pdev = to_pci_dev(gc->dev); + INIT_WORK(&mns_wk->serv_work, mana_serv_func); + schedule_work(&mns_wk->serv_work); + break; + default: break; } diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h index 228603bf03f2..d0fbc9c64cc8 100644 --- a/include/net/mana/gdma.h +++ b/include/net/mana/gdma.h @@ -58,8 +58,9 @@ 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_SOCMANA_CRASH = 135, GDMA_EQE_RNIC_QP_FATAL = 176, }; @@ -388,6 +389,8 @@ 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; @@ -558,12 +561,16 @@ 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 EQE notification */ +#define GDMA_DRV_CAP_FLAG_1_SELF_RESET_ON_EQE BIT(14) + #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_SELF_RESET_ON_EQE) #define GDMA_DRV_CAP_FLAGS2 0 -- 2.34.1
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