[PATCH net-next v2 1/9] octeon_ep: defer probe if firmware not ready
From: Veerasenareddy Burru <vburru@marvell.com>
Date: 2022-11-29 13:10:19
Also in:
linux-doc, lkml
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Defer probe if firmware is not ready for device usage. Signed-off-by: Veerasenareddy Burru <vburru@marvell.com> Signed-off-by: Abhijit Ayarekar <redacted> Signed-off-by: Satananda Burla <sburla@marvell.com> --- v1 -> v2: * was scheduling workqueue task to wait for firmware ready, to probe/initialize the device. * now, removed the workqueue task; the probe returns EPROBE_DEFER, if firmware is not ready. * removed device status oct->status, as it is not required with the modified implementation. .../ethernet/marvell/octeon_ep/octep_main.c | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
index 5a898fb88e37..aa7d0ced9807 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c@@ -1017,6 +1017,25 @@ static void octep_device_cleanup(struct octep_device *oct) oct->conf = NULL; } +static u8 get_fw_ready_status(struct pci_dev *pdev) +{ + u32 pos = 0; + u16 vsec_id; + u8 status; + + while ((pos = pci_find_next_ext_capability(pdev, pos, + PCI_EXT_CAP_ID_VNDR))) { + pci_read_config_word(pdev, pos + 4, &vsec_id); +#define FW_STATUS_VSEC_ID 0xA3 + if (vsec_id == FW_STATUS_VSEC_ID) { + pci_read_config_byte(pdev, (pos + 8), &status); + dev_info(&pdev->dev, "Firmware ready %u\n", status); + return status; + } + } + return 0; +} + /** * octep_probe() - Octeon PCI device probe handler. *
@@ -1053,6 +1072,13 @@ static int octep_probe(struct pci_dev *pdev, const struct pci_device_id *ent) pci_enable_pcie_error_reporting(pdev); pci_set_master(pdev); +#define FW_STATUS_READY 1 + if (get_fw_ready_status(pdev) != FW_STATUS_READY) { + dev_notice(&pdev->dev, "Firmware not ready; defer probe.\n"); + err = -EPROBE_DEFER; + goto err_alloc_netdev; + } + netdev = alloc_etherdev_mq(sizeof(struct octep_device), OCTEP_MAX_QUEUES); if (!netdev) {
--
2.36.0