qlcnic: Support SR-IOV enable and disable

o Add QLCNIC_SRIOV to Kconfig.
o Provide PCI sysfs hooks to enable and disable SR-IOV.
o Allow enabling only when CONFIG_QLCNIC_SRIOV is defined.
o qlcnic_sriov_pf.c has all the PF related SR-IOV
  functionality.
o qlcnic_sriov_common.c has VF functionality and SR-IOV
  functionality which is common between VF and PF.
o qlcnic_sriov.h is a common header file for SR-IOV defines.

Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: Rajesh Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 455 insertions, 0 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
new file mode 100644
index 000000000000..aa5ba6ec4d87
--- /dev/null
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
@@ -0,0 +1,455 @@
+/*
+ * QLogic qlcnic NIC Driver
+ * Copyright (c) 2009-2013 QLogic Corporation
+ *
+ * See LICENSE.qlcnic for copyright and licensing details.
+ */
+
+#include "qlcnic_sriov.h"
+#include "qlcnic.h"
+#include <linux/types.h>
+
+#define QLCNIC_SRIOV_VF_MAX_MAC 1
+
+static int qlcnic_sriov_pf_get_vport_handle(struct qlcnic_adapter *, u8);
+
+static int qlcnic_sriov_pf_set_vport_info(struct qlcnic_adapter *adapter,
+					  struct qlcnic_info *npar_info,
+					  u16 vport_id)
+{
+	struct qlcnic_cmd_args cmd;
+	int err;
+
+	if (qlcnic_alloc_mbx_args(&cmd, adapter, QLCNIC_CMD_SET_NIC_INFO))
+		return -ENOMEM;
+
+	cmd.req.arg[1] = (vport_id << 16) | 0x1;
+	cmd.req.arg[2] = npar_info->bit_offsets;
+	cmd.req.arg[2] |= npar_info->min_tx_bw << 16;
+	cmd.req.arg[3] = npar_info->max_tx_bw | (npar_info->max_tx_ques << 16);
+	cmd.req.arg[4] = npar_info->max_tx_mac_filters;
+	cmd.req.arg[4] |= npar_info->max_rx_mcast_mac_filters << 16;
+	cmd.req.arg[5] = npar_info->max_rx_ucast_mac_filters |
+			 (npar_info->max_rx_ip_addr << 16);
+	cmd.req.arg[6] = npar_info->max_rx_lro_flow |
+			 (npar_info->max_rx_status_rings << 16);
+	cmd.req.arg[7] = npar_info->max_rx_buf_rings |
+			 (npar_info->max_rx_ques << 16);
+	cmd.req.arg[8] = npar_info->max_tx_vlan_keys;
+	cmd.req.arg[8] |= npar_info->max_local_ipv6_addrs << 16;
+	cmd.req.arg[9] = npar_info->max_remote_ipv6_addrs;
+
+	err = qlcnic_issue_cmd(adapter, &cmd);
+	if (err)
+		dev_err(&adapter->pdev->dev,
+			"Failed to set vport info, err=%d\n", err);
+
+	qlcnic_free_mbx_args(&cmd);
+	return err;
+}
+
+static int qlcnic_sriov_pf_cal_res_limit(struct qlcnic_adapter *adapter,
+					 struct qlcnic_info *info, u16 func)
+{
+	struct qlcnic_sriov *sriov = adapter->ahw->sriov;
+	struct qlcnic_resources *res = &sriov->ff_max;
+	int ret = -EIO, vpid;
+	u32 temp, num_vf_macs, num_vfs, max;
+
+	vpid = qlcnic_sriov_pf_get_vport_handle(adapter, func);
+	if (vpid < 0)
+		return -EINVAL;
+
+	num_vfs = sriov->num_vfs;
+	max = num_vfs + 1;
+	info->bit_offsets = 0xffff;
+	info->min_tx_bw = 0;
+	info->max_tx_bw = MAX_BW;
+	info->max_tx_ques = res->num_tx_queues / max;
+	info->max_rx_mcast_mac_filters = res->num_rx_mcast_mac_filters;
+	num_vf_macs = QLCNIC_SRIOV_VF_MAX_MAC;
+
+	if (adapter->ahw->pci_func == func) {
+		temp = res->num_rx_mcast_mac_filters - (num_vfs * num_vf_macs);
+		info->max_rx_ucast_mac_filters = temp;
+		temp = res->num_tx_mac_filters - (num_vfs * num_vf_macs);
+		info->max_tx_mac_filters = temp;
+	} else {
+		info->max_rx_ucast_mac_filters = num_vf_macs;
+		info->max_tx_mac_filters = num_vf_macs;
+	}
+
+	info->max_rx_ip_addr = res->num_destip / max;
+	info->max_rx_status_rings = res->num_rx_status_rings / max;
+	info->max_rx_buf_rings = res->num_rx_buf_rings / max;
+	info->max_rx_ques = res->num_rx_queues / max;
+	info->max_rx_lro_flow = res->num_lro_flows_supported / max;
+	info->max_tx_vlan_keys = res->num_txvlan_keys;
+	info->max_local_ipv6_addrs = res->max_local_ipv6_addrs;
+	info->max_remote_ipv6_addrs = res->max_remote_ipv6_addrs;
+
+	ret = qlcnic_sriov_pf_set_vport_info(adapter, info, vpid);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void qlcnic_sriov_pf_set_ff_max_res(struct qlcnic_adapter *adapter,
+					   struct qlcnic_info *info)
+{
+	struct qlcnic_resources *ff_max = &adapter->ahw->sriov->ff_max;
+
+	ff_max->num_tx_mac_filters = info->max_tx_mac_filters;
+	ff_max->num_rx_ucast_mac_filters = info->max_rx_ucast_mac_filters;
+	ff_max->num_rx_mcast_mac_filters = info->max_rx_mcast_mac_filters;
+	ff_max->num_txvlan_keys = info->max_tx_vlan_keys;
+	ff_max->num_rx_queues = info->max_rx_ques;
+	ff_max->num_tx_queues = info->max_tx_ques;
+	ff_max->num_lro_flows_supported = info->max_rx_lro_flow;
+	ff_max->num_destip = info->max_rx_ip_addr;
+	ff_max->num_rx_buf_rings = info->max_rx_buf_rings;
+	ff_max->num_rx_status_rings = info->max_rx_status_rings;
+	ff_max->max_remote_ipv6_addrs = info->max_remote_ipv6_addrs;
+	ff_max->max_local_ipv6_addrs = info->max_local_ipv6_addrs;
+}
+
+static int qlcnic_sriov_get_pf_info(struct qlcnic_adapter *adapter,
+				    struct qlcnic_info *npar_info)
+{
+	int err;
+	struct qlcnic_cmd_args cmd;
+
+	if (qlcnic_alloc_mbx_args(&cmd, adapter, QLCNIC_CMD_GET_NIC_INFO))
+		return -ENOMEM;
+
+	cmd.req.arg[1] = 0x2;
+	err = qlcnic_issue_cmd(adapter, &cmd);
+	if (err) {
+		dev_err(&adapter->pdev->dev,
+			"Failed to get PF info, err=%d\n", err);
+		goto out;
+	}
+
+	npar_info->total_pf = cmd.rsp.arg[2] & 0xff;
+	npar_info->total_rss_engines = (cmd.rsp.arg[2] >> 8) & 0xff;
+	npar_info->max_vports = MSW(cmd.rsp.arg[2]);
+	npar_info->max_tx_ques =  LSW(cmd.rsp.arg[3]);
+	npar_info->max_tx_mac_filters = MSW(cmd.rsp.arg[3]);
+	npar_info->max_rx_mcast_mac_filters = LSW(cmd.rsp.arg[4]);
+	npar_info->max_rx_ucast_mac_filters = MSW(cmd.rsp.arg[4]);
+	npar_info->max_rx_ip_addr = LSW(cmd.rsp.arg[5]);
+	npar_info->max_rx_lro_flow = MSW(cmd.rsp.arg[5]);
+	npar_info->max_rx_status_rings = LSW(cmd.rsp.arg[6]);
+	npar_info->max_rx_buf_rings = MSW(cmd.rsp.arg[6]);
+	npar_info->max_rx_ques = LSW(cmd.rsp.arg[7]);
+	npar_info->max_tx_vlan_keys = MSW(cmd.rsp.arg[7]);
+	npar_info->max_local_ipv6_addrs = LSW(cmd.rsp.arg[8]);
+	npar_info->max_remote_ipv6_addrs = MSW(cmd.rsp.arg[8]);
+
+	dev_info(&adapter->pdev->dev,
+		 "\n\ttotal_pf: %d,\n"
+		 "\n\ttotal_rss_engines: %d max_vports: %d max_tx_ques %d,\n"
+		 "\tmax_tx_mac_filters: %d max_rx_mcast_mac_filters: %d,\n"
+		 "\tmax_rx_ucast_mac_filters: 0x%x, max_rx_ip_addr: %d,\n"
+		 "\tmax_rx_lro_flow: %d max_rx_status_rings: %d,\n"
+		 "\tmax_rx_buf_rings: %d, max_rx_ques: %d, max_tx_vlan_keys %d\n"
+		 "\tmax_local_ipv6_addrs: %d, max_remote_ipv6_addrs: %d\n",
+		 npar_info->total_pf, npar_info->total_rss_engines,
+		 npar_info->max_vports, npar_info->max_tx_ques,
+		 npar_info->max_tx_mac_filters,
+		 npar_info->max_rx_mcast_mac_filters,
+		 npar_info->max_rx_ucast_mac_filters, npar_info->max_rx_ip_addr,
+		 npar_info->max_rx_lro_flow, npar_info->max_rx_status_rings,
+		 npar_info->max_rx_buf_rings, npar_info->max_rx_ques,
+		 npar_info->max_tx_vlan_keys, npar_info->max_local_ipv6_addrs,
+		 npar_info->max_remote_ipv6_addrs);
+
+out:
+	qlcnic_free_mbx_args(&cmd);
+	return err;
+}
+
+static void qlcnic_sriov_pf_reset_vport_handle(struct qlcnic_adapter *adapter,
+					       u8 func)
+{
+	struct qlcnic_sriov  *sriov = adapter->ahw->sriov;
+
+	if (adapter->ahw->pci_func == func)
+		sriov->vp_handle = 0;
+}
+
+static void qlcnic_sriov_pf_set_vport_handle(struct qlcnic_adapter *adapter,
+					     u16 vport_handle, u8 func)
+{
+	struct qlcnic_sriov  *sriov = adapter->ahw->sriov;
+
+	if (adapter->ahw->pci_func == func)
+		sriov->vp_handle = vport_handle;
+}
+
+static int qlcnic_sriov_pf_get_vport_handle(struct qlcnic_adapter *adapter,
+					    u8 func)
+{
+	struct qlcnic_sriov  *sriov = adapter->ahw->sriov;
+
+	if (adapter->ahw->pci_func == func)
+		return sriov->vp_handle;
+
+	return -EINVAL;
+}
+
+static int qlcnic_sriov_pf_config_vport(struct qlcnic_adapter *adapter,
+					u8 flag, u16 func)
+{
+	struct qlcnic_cmd_args cmd;
+	int ret;
+	int vpid;
+
+	if (qlcnic_alloc_mbx_args(&cmd, adapter, QLCNIC_CMD_CONFIG_VPORT))
+		return -ENOMEM;
+
+	if (flag) {
+		cmd.req.arg[3] = func << 8;
+	} else {
+		vpid = qlcnic_sriov_pf_get_vport_handle(adapter, func);
+		if (vpid < 0) {
+			ret = -EINVAL;
+			goto out;
+		}
+		cmd.req.arg[3] = ((vpid & 0xffff) << 8) | 1;
+	}
+
+	ret = qlcnic_issue_cmd(adapter, &cmd);
+	if (ret) {
+		dev_err(&adapter->pdev->dev,
+			"Failed %s vport, err %d for func 0x%x\n",
+			(flag ? "enable" : "disable"), ret, func);
+		goto out;
+	}
+
+	if (flag) {
+		vpid = cmd.rsp.arg[2] & 0xffff;
+		qlcnic_sriov_pf_set_vport_handle(adapter, vpid, func);
+	} else {
+		qlcnic_sriov_pf_reset_vport_handle(adapter, func);
+	}
+
+out:
+	qlcnic_free_mbx_args(&cmd);
+	return ret;
+}
+
+static int qlcnic_sriov_pf_cfg_eswitch(struct qlcnic_adapter *adapter,
+				       u8 func, u8 enable)
+{
+	struct qlcnic_cmd_args cmd;
+	int err = -EIO;
+
+	if (qlcnic_alloc_mbx_args(&cmd, adapter, QLCNIC_CMD_TOGGLE_ESWITCH))
+		return -ENOMEM;
+
+	cmd.req.arg[0] |= (3 << 29);
+	cmd.req.arg[1] = ((func & 0xf) << 2) | BIT_6 | BIT_1;
+	if (enable)
+		cmd.req.arg[1] |= BIT_0;
+
+	err = qlcnic_issue_cmd(adapter, &cmd);
+
+	if (err != QLCNIC_RCODE_SUCCESS) {
+		dev_err(&adapter->pdev->dev,
+			"Failed to enable sriov eswitch%d\n", err);
+		err = -EIO;
+	}
+
+	qlcnic_free_mbx_args(&cmd);
+	return err;
+}
+
+void qlcnic_sriov_pf_cleanup(struct qlcnic_adapter *adapter)
+{
+	u8 func = adapter->ahw->pci_func;
+
+	if (!qlcnic_sriov_enable_check(adapter))
+		return;
+
+	qlcnic_sriov_pf_config_vport(adapter, 0, func);
+	qlcnic_sriov_pf_cfg_eswitch(adapter, func, 0);
+	__qlcnic_sriov_cleanup(adapter);
+	adapter->ahw->op_mode = QLCNIC_MGMT_FUNC;
+	clear_bit(__QLCNIC_SRIOV_ENABLE, &adapter->state);
+}
+
+void qlcnic_sriov_pf_disable(struct qlcnic_adapter *adapter)
+{
+	if (!qlcnic_sriov_pf_check(adapter))
+		return;
+
+	if (!qlcnic_sriov_enable_check(adapter))
+		return;
+
+	pci_disable_sriov(adapter->pdev);
+	netdev_info(adapter->netdev,
+		    "SR-IOV is disabled successfully on port %d\n",
+		    adapter->portnum);
+}
+
+static int qlcnic_pci_sriov_disable(struct qlcnic_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+
+	if (netif_running(netdev))
+		__qlcnic_down(adapter, netdev);
+
+	qlcnic_sriov_pf_disable(adapter);
+
+	qlcnic_sriov_pf_cleanup(adapter);
+
+	/* After disabling SRIOV re-init the driver in default mode
+	   configure opmode based on op_mode of function
+	 */
+	if (qlcnic_83xx_configure_opmode(adapter))
+		return -EIO;
+
+	if (netif_running(netdev))
+		__qlcnic_up(adapter, netdev);
+
+	return 0;
+}
+
+static int qlcnic_sriov_pf_init(struct qlcnic_adapter *adapter)
+{
+	struct qlcnic_hardware_context *ahw = adapter->ahw;
+	struct qlcnic_info nic_info, pf_info, vp_info;
+	int err;
+	u8 func = ahw->pci_func;
+
+	if (!qlcnic_sriov_enable_check(adapter))
+		return 0;
+
+	err = qlcnic_sriov_pf_cfg_eswitch(adapter, func, 1);
+	if (err)
+		goto clear_sriov_enable;
+
+	err = qlcnic_sriov_pf_config_vport(adapter, 1, func);
+	if (err)
+		goto disable_eswitch;
+
+	err = qlcnic_sriov_get_pf_info(adapter, &pf_info);
+	if (err)
+		goto delete_vport;
+
+	qlcnic_sriov_pf_set_ff_max_res(adapter, &pf_info);
+
+	err = qlcnic_get_nic_info(adapter, &nic_info, func);
+	if (err)
+		goto delete_vport;
+
+	err = qlcnic_sriov_pf_cal_res_limit(adapter, &vp_info, func);
+	if (err)
+		goto delete_vport;
+
+	ahw->physical_port = (u8) nic_info.phys_port;
+	ahw->switch_mode = nic_info.switch_mode;
+	ahw->max_mtu = nic_info.max_mtu;
+	ahw->capabilities = nic_info.capabilities;
+	ahw->nic_mode = QLC_83XX_SRIOV_MODE;
+	return err;
+
+delete_vport:
+	qlcnic_sriov_pf_config_vport(adapter, 0, func);
+
+disable_eswitch:
+	qlcnic_sriov_pf_cfg_eswitch(adapter, func, 0);
+
+clear_sriov_enable:
+	__qlcnic_sriov_cleanup(adapter);
+	adapter->ahw->op_mode = QLCNIC_MGMT_FUNC;
+	clear_bit(__QLCNIC_SRIOV_ENABLE, &adapter->state);
+	return err;
+}
+
+static int qlcnic_sriov_pf_enable(struct qlcnic_adapter *adapter, int num_vfs)
+{
+	int err;
+
+	if (!qlcnic_sriov_enable_check(adapter))
+		return 0;
+
+	err = pci_enable_sriov(adapter->pdev, num_vfs);
+	if (err)
+		qlcnic_sriov_pf_cleanup(adapter);
+
+	return err;
+}
+
+static int __qlcnic_pci_sriov_enable(struct qlcnic_adapter *adapter,
+				     int num_vfs)
+{
+	int err = 0;
+
+	set_bit(__QLCNIC_SRIOV_ENABLE, &adapter->state);
+	adapter->ahw->op_mode = QLCNIC_SRIOV_PF_FUNC;
+
+	if (qlcnic_sriov_init(adapter, num_vfs)) {
+		clear_bit(__QLCNIC_SRIOV_ENABLE, &adapter->state);
+		adapter->ahw->op_mode = QLCNIC_MGMT_FUNC;
+		return -EIO;
+	}
+
+	if (qlcnic_sriov_pf_init(adapter))
+		return -EIO;
+
+	err = qlcnic_sriov_pf_enable(adapter, num_vfs);
+	return err;
+}
+
+static int qlcnic_pci_sriov_enable(struct qlcnic_adapter *adapter, int num_vfs)
+{
+	struct net_device *netdev = adapter->netdev;
+	int err;
+
+	if (!(adapter->flags & QLCNIC_MSIX_ENABLED)) {
+		netdev_err(netdev,
+			   "SR-IOV cannot be enabled, when legacy interrupts are enabled\n");
+		return -EIO;
+	}
+
+	if (netif_running(netdev))
+		__qlcnic_down(adapter, netdev);
+
+	err = __qlcnic_pci_sriov_enable(adapter, num_vfs);
+	if (err) {
+		netdev_info(netdev, "Failed to enable SR-IOV on port %d\n",
+			    adapter->portnum);
+
+		if (qlcnic_83xx_configure_opmode(adapter))
+			goto error;
+	} else {
+		netdev_info(adapter->netdev,
+			    "SR-IOV is enabled successfully on port %d\n",
+			    adapter->portnum);
+	}
+	if (netif_running(netdev))
+		__qlcnic_up(adapter, netdev);
+
+error:
+	return err;
+}
+
+int qlcnic_pci_sriov_configure(struct pci_dev *dev, int num_vfs)
+{
+	struct qlcnic_adapter *adapter = pci_get_drvdata(dev);
+	int err;
+
+	if (test_and_set_bit(__QLCNIC_RESETTING, &adapter->state))
+		return -EBUSY;
+
+	if (num_vfs == 0)
+		err = qlcnic_pci_sriov_disable(adapter);
+	else
+		err = qlcnic_pci_sriov_enable(adapter, num_vfs);
+
+	clear_bit(__QLCNIC_RESETTING, &adapter->state);
+	return err;
+}