linux/drivers/net/ethernet/netronome/nfp/nfp_net_sriov.c

// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2017-2019 Netronome Systems, Inc. */

#include <linux/bitfield.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/if_link.h>
#include <linux/if_ether.h>

#include "nfpcore/nfp_cpp.h"
#include "nfp_app.h"
#include "nfp_main.h"
#include "nfp_net_ctrl.h"
#include "nfp_net.h"
#include "nfp_net_sriov.h"

static int
nfp_net_sriov_check(struct nfp_app *app, int vf, u16 cap, const char *msg, bool warn)
{
	u16 cap_vf;

	if (!app || !app->pf->vfcfg_tbl2)
		return -EOPNOTSUPP;

	cap_vf = readw(app->pf->vfcfg_tbl2 + NFP_NET_VF_CFG_MB_CAP);
	if ((cap_vf & cap) != cap) {
		if (warn)
			nfp_warn(app->pf->cpp, "ndo_set_vf_%s not supported\n", msg);
		return -EOPNOTSUPP;
	}

	if (vf < 0 || vf >= app->pf->num_vfs) {
		if (warn)
			nfp_warn(app->pf->cpp, "invalid VF id %d\n", vf);
		return -EINVAL;
	}

	return 0;
}

static int
nfp_net_sriov_update(struct nfp_app *app, int vf, u16 update, const char *msg)
{
	struct nfp_net *nn;
	int ret;

	/* Write update info to mailbox in VF config symbol */
	writeb(vf, app->pf->vfcfg_tbl2 + NFP_NET_VF_CFG_MB_VF_NUM);
	writew(update, app->pf->vfcfg_tbl2 + NFP_NET_VF_CFG_MB_UPD);

	nn = list_first_entry(&app->pf->vnics, struct nfp_net, vnic_list);
	/* Signal VF reconfiguration */
	ret = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_VF);
	if (ret)
		return ret;

	ret = readw(app->pf->vfcfg_tbl2 + NFP_NET_VF_CFG_MB_RET);
	if (ret)
		nfp_warn(app->pf->cpp,
			 "FW refused VF %s update with errno: %d\n", msg, ret);
	return -ret;
}

int nfp_app_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
{
	struct nfp_app *app = nfp_app_from_netdev(netdev);
	unsigned int vf_offset;
	int err;

	err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_MAC, "mac", true);
	if (err)
		return err;

	if (is_multicast_ether_addr(mac)) {
		nfp_warn(app->pf->cpp,
			 "invalid Ethernet address %pM for VF id %d\n",
			 mac, vf);
		return -EINVAL;
	}

	/* Write MAC to VF entry in VF config symbol */
	vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ;
	writel(get_unaligned_be32(mac), app->pf->vfcfg_tbl2 + vf_offset);
	writew(get_unaligned_be16(mac + 4),
	       app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_MAC_LO);

	err = nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_MAC, "MAC");
	if (!err)
		nfp_info(app->pf->cpp,
			 "MAC %pM set on VF %d, reload the VF driver to make this change effective.\n",
			 mac, vf);

	return err;
}

int nfp_app_set_vf_vlan(struct net_device *netdev, int vf, u16 vlan, u8 qos,
			__be16 vlan_proto)
{
	struct nfp_app *app = nfp_app_from_netdev(netdev);
	u16 update = NFP_NET_VF_CFG_MB_UPD_VLAN;
	bool is_proto_sup = true;
	unsigned int vf_offset;
	u32 vlan_tag;
	int err;

	err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_VLAN, "vlan", true);
	if (err)
		return err;

	if (!eth_type_vlan(vlan_proto))
		return -EOPNOTSUPP;

	if (vlan > 4095 || qos > 7) {
		nfp_warn(app->pf->cpp,
			 "invalid vlan id or qos for VF id %d\n", vf);
		return -EINVAL;
	}

	/* Check if fw supports or not */
	err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_VLAN_PROTO, "vlan_proto", true);
	if (err)
		is_proto_sup = false;

	if (vlan_proto != htons(ETH_P_8021Q)) {
		if (!is_proto_sup)
			return -EOPNOTSUPP;
		update |= NFP_NET_VF_CFG_MB_UPD_VLAN_PROTO;
	}

	/* Write VLAN tag to VF entry in VF config symbol */
	vlan_tag = FIELD_PREP(NFP_NET_VF_CFG_VLAN_VID, vlan) |
		FIELD_PREP(NFP_NET_VF_CFG_VLAN_QOS, qos);

	/* vlan_tag of 0 means that the configuration should be cleared and in
	 * such circumstances setting the TPID has no meaning when
	 * configuring firmware.
	 */
	if (vlan_tag && is_proto_sup)
		vlan_tag |= FIELD_PREP(NFP_NET_VF_CFG_VLAN_PROT, ntohs(vlan_proto));

	vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ;
	writel(vlan_tag, app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_VLAN);

	return nfp_net_sriov_update(app, vf, update, "vlan");
}

int nfp_app_set_vf_rate(struct net_device *netdev, int vf,
			int min_tx_rate, int max_tx_rate)
{
	struct nfp_app *app = nfp_app_from_netdev(netdev);
	u32 vf_offset, ratevalue;
	int err;

	err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_RATE, "rate", true);
	if (err)
		return err;

	if (max_tx_rate >= NFP_NET_VF_RATE_MAX ||
	    min_tx_rate >= NFP_NET_VF_RATE_MAX) {
		nfp_warn(app->cpp, "tx-rate exceeds %d.\n",
			 NFP_NET_VF_RATE_MAX);
		return -EINVAL;
	}

	vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ;
	ratevalue = FIELD_PREP(NFP_NET_VF_CFG_MAX_RATE,
			       max_tx_rate ? max_tx_rate :
			       NFP_NET_VF_RATE_MAX) |
		    FIELD_PREP(NFP_NET_VF_CFG_MIN_RATE, min_tx_rate);

	writel(ratevalue,
	       app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_RATE);

	return nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_RATE,
				    "rate");
}

int nfp_app_set_vf_spoofchk(struct net_device *netdev, int vf, bool enable)
{
	struct nfp_app *app = nfp_app_from_netdev(netdev);
	unsigned int vf_offset;
	u8 vf_ctrl;
	int err;

	err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_SPOOF,
				  "spoofchk", true);
	if (err)
		return err;

	/* Write spoof check control bit to VF entry in VF config symbol */
	vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ +
		NFP_NET_VF_CFG_CTRL;
	vf_ctrl = readb(app->pf->vfcfg_tbl2 + vf_offset);
	vf_ctrl &= ~NFP_NET_VF_CFG_CTRL_SPOOF;
	vf_ctrl |= FIELD_PREP(NFP_NET_VF_CFG_CTRL_SPOOF, enable);
	writeb(vf_ctrl, app->pf->vfcfg_tbl2 + vf_offset);

	return nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_SPOOF,
				    "spoofchk");
}

int nfp_app_set_vf_trust(struct net_device *netdev, int vf, bool enable)
{
	struct nfp_app *app = nfp_app_from_netdev(netdev);
	unsigned int vf_offset;
	u8 vf_ctrl;
	int err;

	err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_TRUST,
				  "trust", true);
	if (err)
		return err;

	/* Write trust control bit to VF entry in VF config symbol */
	vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ +
		NFP_NET_VF_CFG_CTRL;
	vf_ctrl = readb(app->pf->vfcfg_tbl2 + vf_offset);
	vf_ctrl &= ~NFP_NET_VF_CFG_CTRL_TRUST;
	vf_ctrl |= FIELD_PREP(NFP_NET_VF_CFG_CTRL_TRUST, enable);
	writeb(vf_ctrl, app->pf->vfcfg_tbl2 + vf_offset);

	return nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_TRUST,
				    "trust");
}

int nfp_app_set_vf_link_state(struct net_device *netdev, int vf,
			      int link_state)
{
	struct nfp_app *app = nfp_app_from_netdev(netdev);
	unsigned int vf_offset;
	u8 vf_ctrl;
	int err;

	err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_LINK_STATE,
				  "link_state", true);
	if (err)
		return err;

	switch (link_state) {
	case IFLA_VF_LINK_STATE_AUTO:
	case IFLA_VF_LINK_STATE_ENABLE:
	case IFLA_VF_LINK_STATE_DISABLE:
		break;
	default:
		return -EINVAL;
	}

	/* Write link state to VF entry in VF config symbol */
	vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ +
		NFP_NET_VF_CFG_CTRL;
	vf_ctrl = readb(app->pf->vfcfg_tbl2 + vf_offset);
	vf_ctrl &= ~NFP_NET_VF_CFG_CTRL_LINK_STATE;
	vf_ctrl |= FIELD_PREP(NFP_NET_VF_CFG_CTRL_LINK_STATE, link_state);
	writeb(vf_ctrl, app->pf->vfcfg_tbl2 + vf_offset);

	return nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_LINK_STATE,
				    "link state");
}

int nfp_app_get_vf_config(struct net_device *netdev, int vf,
			  struct ifla_vf_info *ivi)
{
	struct nfp_app *app = nfp_app_from_netdev(netdev);
	u32 vf_offset, mac_hi, rate;
	u32 vlan_tag;
	u16 mac_lo;
	u8 flags;
	int err;

	err = nfp_net_sriov_check(app, vf, 0, "", true);
	if (err)
		return err;

	vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ;

	mac_hi = readl(app->pf->vfcfg_tbl2 + vf_offset);
	mac_lo = readw(app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_MAC_LO);

	flags = readb(app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_CTRL);
	vlan_tag = readl(app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_VLAN);

	memset(ivi, 0, sizeof(*ivi));
	ivi->vf = vf;

	put_unaligned_be32(mac_hi, &ivi->mac[0]);
	put_unaligned_be16(mac_lo, &ivi->mac[4]);

	ivi->vlan = FIELD_GET(NFP_NET_VF_CFG_VLAN_VID, vlan_tag);
	ivi->qos = FIELD_GET(NFP_NET_VF_CFG_VLAN_QOS, vlan_tag);
	if (!nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_VLAN_PROTO, "vlan_proto", false))
		ivi->vlan_proto = htons(FIELD_GET(NFP_NET_VF_CFG_VLAN_PROT, vlan_tag));
	ivi->spoofchk = FIELD_GET(NFP_NET_VF_CFG_CTRL_SPOOF, flags);
	ivi->trusted = FIELD_GET(NFP_NET_VF_CFG_CTRL_TRUST, flags);
	ivi->linkstate = FIELD_GET(NFP_NET_VF_CFG_CTRL_LINK_STATE, flags);

	err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_RATE, "rate", false);
	if (!err) {
		rate = readl(app->pf->vfcfg_tbl2 + vf_offset +
			     NFP_NET_VF_CFG_RATE);

		ivi->max_tx_rate = FIELD_GET(NFP_NET_VF_CFG_MAX_RATE, rate);
		ivi->min_tx_rate = FIELD_GET(NFP_NET_VF_CFG_MIN_RATE, rate);

		if (ivi->max_tx_rate == NFP_NET_VF_RATE_MAX)
			ivi->max_tx_rate = 0;
		if (ivi->min_tx_rate == NFP_NET_VF_RATE_MAX)
			ivi->min_tx_rate = 0;
	}

	return 0;
}