RDMA/irdma: Register auxiliary driver and implement private channel OPs

Register auxiliary drivers which can attach to auxiliary RDMA
devices from Intel PCI netdev drivers i40e and ice. Implement the private
channel ops, and register net notifiers.

Link: https://lore.kernel.org/r/20210602205138.889-2-shiraz.saleem@intel.com
[flexible array transformation]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

1 files changed, 358 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/irdma/main.c b/drivers/infiniband/hw/irdma/main.c
new file mode 100644
index 000000000000..ea59432351fb
--- /dev/null
+++ b/drivers/infiniband/hw/irdma/main.c
@@ -0,0 +1,358 @@
+// SPDX-License-Identifier: GPL-2.0 or Linux-OpenIB
+/* Copyright (c) 2015 - 2021 Intel Corporation */
+#include "main.h"
+#include "../../../net/ethernet/intel/ice/ice.h"
+
+MODULE_ALIAS("i40iw");
+MODULE_AUTHOR("Intel Corporation, <e1000-rdma@lists.sourceforge.net>");
+MODULE_DESCRIPTION("Intel(R) Ethernet Protocol Driver for RDMA");
+MODULE_LICENSE("Dual BSD/GPL");
+
+static struct notifier_block irdma_inetaddr_notifier = {
+	.notifier_call = irdma_inetaddr_event
+};
+
+static struct notifier_block irdma_inetaddr6_notifier = {
+	.notifier_call = irdma_inet6addr_event
+};
+
+static struct notifier_block irdma_net_notifier = {
+	.notifier_call = irdma_net_event
+};
+
+static struct notifier_block irdma_netdevice_notifier = {
+	.notifier_call = irdma_netdevice_event
+};
+
+static void irdma_register_notifiers(void)
+{
+	register_inetaddr_notifier(&irdma_inetaddr_notifier);
+	register_inet6addr_notifier(&irdma_inetaddr6_notifier);
+	register_netevent_notifier(&irdma_net_notifier);
+	register_netdevice_notifier(&irdma_netdevice_notifier);
+}
+
+static void irdma_unregister_notifiers(void)
+{
+	unregister_netevent_notifier(&irdma_net_notifier);
+	unregister_inetaddr_notifier(&irdma_inetaddr_notifier);
+	unregister_inet6addr_notifier(&irdma_inetaddr6_notifier);
+	unregister_netdevice_notifier(&irdma_netdevice_notifier);
+}
+
+static void irdma_prep_tc_change(struct irdma_device *iwdev)
+{
+	iwdev->vsi.tc_change_pending = true;
+	irdma_sc_suspend_resume_qps(&iwdev->vsi, IRDMA_OP_SUSPEND);
+
+	/* Wait for all qp's to suspend */
+	wait_event_timeout(iwdev->suspend_wq,
+			   !atomic_read(&iwdev->vsi.qp_suspend_reqs),
+			   IRDMA_EVENT_TIMEOUT);
+	irdma_ws_reset(&iwdev->vsi);
+}
+
+static void irdma_log_invalid_mtu(u16 mtu, struct irdma_sc_dev *dev)
+{
+	if (mtu < IRDMA_MIN_MTU_IPV4)
+		ibdev_warn(to_ibdev(dev), "MTU setting [%d] too low for RDMA traffic. Minimum MTU is 576 for IPv4\n", mtu);
+	else if (mtu < IRDMA_MIN_MTU_IPV6)
+		ibdev_warn(to_ibdev(dev), "MTU setting [%d] too low for RDMA traffic. Minimum MTU is 1280 for IPv6\\n", mtu);
+}
+
+static void irdma_fill_qos_info(struct irdma_l2params *l2params,
+				struct iidc_qos_params *qos_info)
+{
+	int i;
+
+	l2params->num_tc = qos_info->num_tc;
+	l2params->vsi_prio_type = qos_info->vport_priority_type;
+	l2params->vsi_rel_bw = qos_info->vport_relative_bw;
+	for (i = 0; i < l2params->num_tc; i++) {
+		l2params->tc_info[i].egress_virt_up =
+			qos_info->tc_info[i].egress_virt_up;
+		l2params->tc_info[i].ingress_virt_up =
+			qos_info->tc_info[i].ingress_virt_up;
+		l2params->tc_info[i].prio_type = qos_info->tc_info[i].prio_type;
+		l2params->tc_info[i].rel_bw = qos_info->tc_info[i].rel_bw;
+		l2params->tc_info[i].tc_ctx = qos_info->tc_info[i].tc_ctx;
+	}
+	for (i = 0; i < IIDC_MAX_USER_PRIORITY; i++)
+		l2params->up2tc[i] = qos_info->up2tc[i];
+}
+
+static void irdma_iidc_event_handler(struct ice_pf *pf, struct iidc_event *event)
+{
+	struct irdma_device *iwdev = dev_get_drvdata(&pf->adev->dev);
+	struct irdma_l2params l2params = {};
+
+	if (*event->type & BIT(IIDC_EVENT_AFTER_MTU_CHANGE)) {
+		ibdev_dbg(&iwdev->ibdev, "CLNT: new MTU = %d\n", iwdev->netdev->mtu);
+		if (iwdev->vsi.mtu != iwdev->netdev->mtu) {
+			l2params.mtu = iwdev->netdev->mtu;
+			l2params.mtu_changed = true;
+			irdma_log_invalid_mtu(l2params.mtu, &iwdev->rf->sc_dev);
+			irdma_change_l2params(&iwdev->vsi, &l2params);
+		}
+	} else if (*event->type & BIT(IIDC_EVENT_BEFORE_TC_CHANGE)) {
+		if (iwdev->vsi.tc_change_pending)
+			return;
+
+		irdma_prep_tc_change(iwdev);
+	} else if (*event->type & BIT(IIDC_EVENT_AFTER_TC_CHANGE)) {
+		struct iidc_qos_params qos_info = {};
+
+		if (!iwdev->vsi.tc_change_pending)
+			return;
+
+		l2params.tc_changed = true;
+		ibdev_dbg(&iwdev->ibdev, "CLNT: TC Change\n");
+		ice_get_qos_params(pf, &qos_info);
+		iwdev->dcb = qos_info.num_tc > 1;
+		irdma_fill_qos_info(&l2params, &qos_info);
+		irdma_change_l2params(&iwdev->vsi, &l2params);
+	} else if (*event->type & BIT(IIDC_EVENT_CRIT_ERR)) {
+		ibdev_warn(&iwdev->ibdev, "ICE OICR event notification: oicr = 0x%08x\n",
+			   event->reg);
+		if (event->reg & IRDMAPFINT_OICR_PE_CRITERR_M) {
+			u32 pe_criterr;
+
+			pe_criterr = readl(iwdev->rf->sc_dev.hw_regs[IRDMA_GLPE_CRITERR]);
+#define IRDMA_Q1_RESOURCE_ERR 0x0001024d
+			if (pe_criterr != IRDMA_Q1_RESOURCE_ERR) {
+				ibdev_err(&iwdev->ibdev, "critical PE Error, GLPE_CRITERR=0x%08x\n",
+					  pe_criterr);
+				iwdev->rf->reset = true;
+			} else {
+				ibdev_warn(&iwdev->ibdev, "Q1 Resource Check\n");
+			}
+		}
+		if (event->reg & IRDMAPFINT_OICR_HMC_ERR_M) {
+			ibdev_err(&iwdev->ibdev, "HMC Error\n");
+			iwdev->rf->reset = true;
+		}
+		if (event->reg & IRDMAPFINT_OICR_PE_PUSH_M) {
+			ibdev_err(&iwdev->ibdev, "PE Push Error\n");
+			iwdev->rf->reset = true;
+		}
+		if (iwdev->rf->reset)
+			iwdev->rf->gen_ops.request_reset(iwdev->rf);
+	}
+}
+
+/**
+ * irdma_request_reset - Request a reset
+ * @rf: RDMA PCI function
+ */
+static void irdma_request_reset(struct irdma_pci_f *rf)
+{
+	struct ice_pf *pf = rf->cdev;
+
+	ibdev_warn(&rf->iwdev->ibdev, "Requesting a reset\n");
+	ice_rdma_request_reset(pf, IIDC_PFR);
+}
+
+/**
+ * irdma_lan_register_qset - Register qset with LAN driver
+ * @vsi: vsi structure
+ * @tc_node: Traffic class node
+ */
+static enum irdma_status_code irdma_lan_register_qset(struct irdma_sc_vsi *vsi,
+						      struct irdma_ws_node *tc_node)
+{
+	struct irdma_device *iwdev = vsi->back_vsi;
+	struct ice_pf *pf = iwdev->rf->cdev;
+	struct iidc_rdma_qset_params qset = {};
+	int ret;
+
+	qset.qs_handle = tc_node->qs_handle;
+	qset.tc = tc_node->traffic_class;
+	qset.vport_id = vsi->vsi_idx;
+	ret = ice_add_rdma_qset(pf, &qset);
+	if (ret) {
+		ibdev_dbg(&iwdev->ibdev, "WS: LAN alloc_res for rdma qset failed.\n");
+		return IRDMA_ERR_REG_QSET;
+	}
+
+	tc_node->l2_sched_node_id = qset.teid;
+	vsi->qos[tc_node->user_pri].l2_sched_node_id = qset.teid;
+
+	return 0;
+}
+
+/**
+ * irdma_lan_unregister_qset - Unregister qset with LAN driver
+ * @vsi: vsi structure
+ * @tc_node: Traffic class node
+ */
+static void irdma_lan_unregister_qset(struct irdma_sc_vsi *vsi,
+				      struct irdma_ws_node *tc_node)
+{
+	struct irdma_device *iwdev = vsi->back_vsi;
+	struct ice_pf *pf = iwdev->rf->cdev;
+	struct iidc_rdma_qset_params qset = {};
+
+	qset.qs_handle = tc_node->qs_handle;
+	qset.tc = tc_node->traffic_class;
+	qset.vport_id = vsi->vsi_idx;
+	qset.teid = tc_node->l2_sched_node_id;
+
+	if (ice_del_rdma_qset(pf, &qset))
+		ibdev_dbg(&iwdev->ibdev, "WS: LAN free_res for rdma qset failed.\n");
+}
+
+static void irdma_remove(struct auxiliary_device *aux_dev)
+{
+	struct iidc_auxiliary_dev *iidc_adev = container_of(aux_dev,
+							    struct iidc_auxiliary_dev,
+							    adev);
+	struct ice_pf *pf = iidc_adev->pf;
+	struct irdma_device *iwdev = dev_get_drvdata(&aux_dev->dev);
+
+	irdma_ib_unregister_device(iwdev);
+	ice_rdma_update_vsi_filter(pf, iwdev->vsi_num, false);
+
+	pr_debug("INIT: Gen2 PF[%d] device remove success\n", PCI_FUNC(pf->pdev->devfn));
+}
+
+static void irdma_fill_device_info(struct irdma_device *iwdev, struct ice_pf *pf)
+{
+	struct irdma_pci_f *rf = iwdev->rf;
+	struct ice_vsi *vsi = ice_get_main_vsi(pf);
+
+	rf->cdev = pf;
+	rf->gen_ops.register_qset = irdma_lan_register_qset;
+	rf->gen_ops.unregister_qset = irdma_lan_unregister_qset;
+	rf->hw.hw_addr = pf->hw.hw_addr;
+	rf->pcidev = pf->pdev;
+	rf->msix_count =  pf->num_rdma_msix;
+	rf->msix_entries = &pf->msix_entries[pf->rdma_base_vector];
+	rf->default_vsi.vsi_idx = vsi->vsi_num;
+	rf->protocol_used = IRDMA_ROCE_PROTOCOL_ONLY;
+	rf->rdma_ver = IRDMA_GEN_2;
+	rf->rsrc_profile = IRDMA_HMC_PROFILE_DEFAULT;
+	rf->rst_to = IRDMA_RST_TIMEOUT_HZ;
+	rf->gen_ops.request_reset = irdma_request_reset;
+	rf->limits_sel = 7;
+	rf->iwdev = iwdev;
+
+	iwdev->netdev = vsi->netdev;
+	iwdev->vsi_num = vsi->vsi_num;
+	iwdev->init_state = INITIAL_STATE;
+	iwdev->roce_cwnd = IRDMA_ROCE_CWND_DEFAULT;
+	iwdev->roce_ackcreds = IRDMA_ROCE_ACKCREDS_DEFAULT;
+	iwdev->rcv_wnd = IRDMA_CM_DEFAULT_RCV_WND_SCALED;
+	iwdev->rcv_wscale = IRDMA_CM_DEFAULT_RCV_WND_SCALE;
+	if (rf->protocol_used == IRDMA_ROCE_PROTOCOL_ONLY)
+		iwdev->roce_mode = true;
+}
+
+static int irdma_probe(struct auxiliary_device *aux_dev, const struct auxiliary_device_id *id)
+{
+	struct iidc_auxiliary_dev *iidc_adev = container_of(aux_dev,
+							    struct iidc_auxiliary_dev,
+							    adev);
+	struct ice_pf *pf = iidc_adev->pf;
+	struct iidc_qos_params qos_info = {};
+	struct irdma_device *iwdev;
+	struct irdma_pci_f *rf;
+	struct irdma_l2params l2params = {};
+	int err;
+
+	iwdev = ib_alloc_device(irdma_device, ibdev);
+	if (!iwdev)
+		return -ENOMEM;
+	iwdev->rf = kzalloc(sizeof(*rf), GFP_KERNEL);
+	if (!iwdev->rf) {
+		ib_dealloc_device(&iwdev->ibdev);
+		return -ENOMEM;
+	}
+
+	irdma_fill_device_info(iwdev, pf);
+	rf = iwdev->rf;
+
+	if (irdma_ctrl_init_hw(rf)) {
+		err = -EIO;
+		goto err_ctrl_init;
+	}
+
+	l2params.mtu = iwdev->netdev->mtu;
+	ice_get_qos_params(pf, &qos_info);
+	irdma_fill_qos_info(&l2params, &qos_info);
+	if (irdma_rt_init_hw(iwdev, &l2params)) {
+		err = -EIO;
+		goto err_rt_init;
+	}
+
+	err = irdma_ib_register_device(iwdev);
+	if (err)
+		goto err_ibreg;
+
+	ice_rdma_update_vsi_filter(pf, iwdev->vsi_num, true);
+
+	ibdev_dbg(&iwdev->ibdev, "INIT: Gen2 PF[%d] device probe success\n", PCI_FUNC(rf->pcidev->devfn));
+	dev_set_drvdata(&aux_dev->dev, iwdev);
+
+	return 0;
+
+err_ibreg:
+	irdma_rt_deinit_hw(iwdev);
+err_rt_init:
+	irdma_ctrl_deinit_hw(rf);
+err_ctrl_init:
+	kfree(iwdev->rf);
+	ib_dealloc_device(&iwdev->ibdev);
+
+	return err;
+}
+
+static const struct auxiliary_device_id irdma_auxiliary_id_table[] = {
+	{.name = "ice.iwarp", },
+	{.name = "ice.roce", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(auxiliary, irdma_auxiliary_id_table);
+
+static struct iidc_auxiliary_drv irdma_auxiliary_drv = {
+	.adrv = {
+	    .id_table = irdma_auxiliary_id_table,
+	    .probe = irdma_probe,
+	    .remove = irdma_remove,
+	},
+	.event_handler = irdma_iidc_event_handler,
+};
+
+static int __init irdma_init_module(void)
+{
+	int ret;
+
+	ret = auxiliary_driver_register(&i40iw_auxiliary_drv);
+	if (ret) {
+		pr_err("Failed i40iw(gen_1) auxiliary_driver_register() ret=%d\n",
+		       ret);
+		return ret;
+	}
+
+	ret = auxiliary_driver_register(&irdma_auxiliary_drv.adrv);
+	if (ret) {
+		auxiliary_driver_unregister(&i40iw_auxiliary_drv);
+		pr_err("Failed irdma auxiliary_driver_register() ret=%d\n",
+		       ret);
+		return ret;
+	}
+
+	irdma_register_notifiers();
+
+	return 0;
+}
+
+static void __exit irdma_exit_module(void)
+{
+	irdma_unregister_notifiers();
+	auxiliary_driver_unregister(&irdma_auxiliary_drv.adrv);
+	auxiliary_driver_unregister(&i40iw_auxiliary_drv);
+}
+
+module_init(irdma_init_module);
+module_exit(irdma_exit_module);