// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
 */

#include "devl_internal.h"

#define DEVLINK_PORT_FN_CAPS_VALID_MASK \
        (_BITUL(__DEVLINK_PORT_FN_ATTR_CAPS_MAX) - 1)

static const struct nla_policy devlink_function_nl_policy[DEVLINK_PORT_FUNCTION_ATTR_MAX + 1] = {
        [DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR] = { .type = NLA_BINARY },
        [DEVLINK_PORT_FN_ATTR_STATE] =
                NLA_POLICY_RANGE(NLA_U8, DEVLINK_PORT_FN_STATE_INACTIVE,
                                 DEVLINK_PORT_FN_STATE_ACTIVE),
        [DEVLINK_PORT_FN_ATTR_CAPS] =
                NLA_POLICY_BITFIELD32(DEVLINK_PORT_FN_CAPS_VALID_MASK),
        [DEVLINK_PORT_FN_ATTR_MAX_IO_EQS] = { .type = NLA_U32 },
};

#define ASSERT_DEVLINK_PORT_REGISTERED(devlink_port)                            \
        WARN_ON_ONCE(!(devlink_port)->registered)
#define ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port)                        \
        WARN_ON_ONCE((devlink_port)->registered)

struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
                                               unsigned int port_index)
{
        return xa_load(&devlink->ports, port_index);
}

struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
                                                 struct nlattr **attrs)
{
        if (attrs[DEVLINK_ATTR_PORT_INDEX]) {
                u32 port_index = nla_get_u32(attrs[DEVLINK_ATTR_PORT_INDEX]);
                struct devlink_port *devlink_port;

                devlink_port = devlink_port_get_by_index(devlink, port_index);
                if (!devlink_port)
                        return ERR_PTR(-ENODEV);
                return devlink_port;
        }
        return ERR_PTR(-EINVAL);
}

struct devlink_port *devlink_port_get_from_info(struct devlink *devlink,
                                                struct genl_info *info)
{
        return devlink_port_get_from_attrs(devlink, info->attrs);
}

static void devlink_port_fn_cap_fill(struct nla_bitfield32 *caps,
                                     u32 cap, bool is_enable)
{
        caps->selector |= cap;
        if (is_enable)
                caps->value |= cap;
}

static int devlink_port_fn_roce_fill(struct devlink_port *devlink_port,
                                     struct nla_bitfield32 *caps,
                                     struct netlink_ext_ack *extack)
{
        bool is_enable;
        int err;

        if (!devlink_port->ops->port_fn_roce_get)
                return 0;

        err = devlink_port->ops->port_fn_roce_get(devlink_port, &is_enable,
                                                  extack);
        if (err) {
                if (err == -EOPNOTSUPP)
                        return 0;
                return err;
        }

        devlink_port_fn_cap_fill(caps, DEVLINK_PORT_FN_CAP_ROCE, is_enable);
        return 0;
}

static int devlink_port_fn_migratable_fill(struct devlink_port *devlink_port,
                                           struct nla_bitfield32 *caps,
                                           struct netlink_ext_ack *extack)
{
        bool is_enable;
        int err;

        if (!devlink_port->ops->port_fn_migratable_get ||
            devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_PCI_VF)
                return 0;

        err = devlink_port->ops->port_fn_migratable_get(devlink_port,
                                                        &is_enable, extack);
        if (err) {
                if (err == -EOPNOTSUPP)
                        return 0;
                return err;
        }

        devlink_port_fn_cap_fill(caps, DEVLINK_PORT_FN_CAP_MIGRATABLE, is_enable);
        return 0;
}

static int devlink_port_fn_ipsec_crypto_fill(struct devlink_port *devlink_port,
                                             struct nla_bitfield32 *caps,
                                             struct netlink_ext_ack *extack)
{
        bool is_enable;
        int err;

        if (!devlink_port->ops->port_fn_ipsec_crypto_get ||
            devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_PCI_VF)
                return 0;

        err = devlink_port->ops->port_fn_ipsec_crypto_get(devlink_port, &is_enable, extack);
        if (err) {
                if (err == -EOPNOTSUPP)
                        return 0;
                return err;
        }

        devlink_port_fn_cap_fill(caps, DEVLINK_PORT_FN_CAP_IPSEC_CRYPTO, is_enable);
        return 0;
}

static int devlink_port_fn_ipsec_packet_fill(struct devlink_port *devlink_port,
                                             struct nla_bitfield32 *caps,
                                             struct netlink_ext_ack *extack)
{
        bool is_enable;
        int err;

        if (!devlink_port->ops->port_fn_ipsec_packet_get ||
            devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_PCI_VF)
                return 0;

        err = devlink_port->ops->port_fn_ipsec_packet_get(devlink_port, &is_enable, extack);
        if (err) {
                if (err == -EOPNOTSUPP)
                        return 0;
                return err;
        }

        devlink_port_fn_cap_fill(caps, DEVLINK_PORT_FN_CAP_IPSEC_PACKET, is_enable);
        return 0;
}

static int devlink_port_fn_caps_fill(struct devlink_port *devlink_port,
                                     struct sk_buff *msg,
                                     struct netlink_ext_ack *extack,
                                     bool *msg_updated)
{
        struct nla_bitfield32 caps = {};
        int err;

        err = devlink_port_fn_roce_fill(devlink_port, &caps, extack);
        if (err)
                return err;

        err = devlink_port_fn_migratable_fill(devlink_port, &caps, extack);
        if (err)
                return err;

        err = devlink_port_fn_ipsec_crypto_fill(devlink_port, &caps, extack);
        if (err)
                return err;

        err = devlink_port_fn_ipsec_packet_fill(devlink_port, &caps, extack);
        if (err)
                return err;

        if (!caps.selector)
                return 0;
        err = nla_put_bitfield32(msg, DEVLINK_PORT_FN_ATTR_CAPS, caps.value,
                                 caps.selector);
        if (err)
                return err;

        *msg_updated = true;
        return 0;
}

static int devlink_port_fn_max_io_eqs_fill(struct devlink_port *port,
                                           struct sk_buff *msg,
                                           struct netlink_ext_ack *extack,
                                           bool *msg_updated)
{
        u32 max_io_eqs;
        int err;

        if (!port->ops->port_fn_max_io_eqs_get)
                return 0;

        err = port->ops->port_fn_max_io_eqs_get(port, &max_io_eqs, extack);
        if (err) {
                if (err == -EOPNOTSUPP)
                        return 0;
                return err;
        }
        err = nla_put_u32(msg, DEVLINK_PORT_FN_ATTR_MAX_IO_EQS, max_io_eqs);
        if (err)
                return err;
        *msg_updated = true;
        return 0;
}

int devlink_nl_port_handle_fill(struct sk_buff *msg, struct devlink_port *devlink_port)
{
        if (devlink_nl_put_handle(msg, devlink_port->devlink))
                return -EMSGSIZE;
        if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX, devlink_port->index))
                return -EMSGSIZE;
        return 0;
}

size_t devlink_nl_port_handle_size(struct devlink_port *devlink_port)
{
        struct devlink *devlink = devlink_port->devlink;

        return nla_total_size(strlen(devlink->dev->bus->name) + 1) /* DEVLINK_ATTR_BUS_NAME */
             + nla_total_size(strlen(dev_name(devlink->dev)) + 1) /* DEVLINK_ATTR_DEV_NAME */
             + nla_total_size(4); /* DEVLINK_ATTR_PORT_INDEX */
}

static int devlink_nl_port_attrs_put(struct sk_buff *msg,
                                     struct devlink_port *devlink_port)
{
        struct devlink_port_attrs *attrs = &devlink_port->attrs;

        if (!devlink_port->attrs_set)
                return 0;
        if (attrs->lanes) {
                if (nla_put_u32(msg, DEVLINK_ATTR_PORT_LANES, attrs->lanes))
                        return -EMSGSIZE;
        }
        if (nla_put_u8(msg, DEVLINK_ATTR_PORT_SPLITTABLE, attrs->splittable))
                return -EMSGSIZE;
        if (nla_put_u16(msg, DEVLINK_ATTR_PORT_FLAVOUR, attrs->flavour))
                return -EMSGSIZE;
        switch (devlink_port->attrs.flavour) {
        case DEVLINK_PORT_FLAVOUR_PCI_PF:
                if (nla_put_u32(msg, DEVLINK_ATTR_PORT_CONTROLLER_NUMBER,
                                attrs->pci_pf.controller) ||
                    nla_put_u16(msg, DEVLINK_ATTR_PORT_PCI_PF_NUMBER, attrs->pci_pf.pf))
                        return -EMSGSIZE;
                if (nla_put_u8(msg, DEVLINK_ATTR_PORT_EXTERNAL, attrs->pci_pf.external))
                        return -EMSGSIZE;
                break;
        case DEVLINK_PORT_FLAVOUR_PCI_VF:
                if (nla_put_u32(msg, DEVLINK_ATTR_PORT_CONTROLLER_NUMBER,
                                attrs->pci_vf.controller) ||
                    nla_put_u16(msg, DEVLINK_ATTR_PORT_PCI_PF_NUMBER, attrs->pci_vf.pf) ||
                    nla_put_u16(msg, DEVLINK_ATTR_PORT_PCI_VF_NUMBER, attrs->pci_vf.vf))
                        return -EMSGSIZE;
                if (nla_put_u8(msg, DEVLINK_ATTR_PORT_EXTERNAL, attrs->pci_vf.external))
                        return -EMSGSIZE;
                break;
        case DEVLINK_PORT_FLAVOUR_PCI_SF:
                if (nla_put_u32(msg, DEVLINK_ATTR_PORT_CONTROLLER_NUMBER,
                                attrs->pci_sf.controller) ||
                    nla_put_u16(msg, DEVLINK_ATTR_PORT_PCI_PF_NUMBER,
                                attrs->pci_sf.pf) ||
                    nla_put_u32(msg, DEVLINK_ATTR_PORT_PCI_SF_NUMBER,
                                attrs->pci_sf.sf))
                        return -EMSGSIZE;
                break;
        case DEVLINK_PORT_FLAVOUR_PHYSICAL:
        case DEVLINK_PORT_FLAVOUR_CPU:
        case DEVLINK_PORT_FLAVOUR_DSA:
                if (nla_put_u32(msg, DEVLINK_ATTR_PORT_NUMBER,
                                attrs->phys.port_number))
                        return -EMSGSIZE;
                if (!attrs->split)
                        return 0;
                if (nla_put_u32(msg, DEVLINK_ATTR_PORT_SPLIT_GROUP,
                                attrs->phys.port_number))
                        return -EMSGSIZE;
                if (nla_put_u32(msg, DEVLINK_ATTR_PORT_SPLIT_SUBPORT_NUMBER,
                                attrs->phys.split_subport_number))
                        return -EMSGSIZE;
                break;
        default:
                break;
        }
        return 0;
}

static int devlink_port_fn_hw_addr_fill(struct devlink_port *port,
                                        struct sk_buff *msg,
                                        struct netlink_ext_ack *extack,
                                        bool *msg_updated)
{
        u8 hw_addr[MAX_ADDR_LEN];
        int hw_addr_len;
        int err;

        if (!port->ops->port_fn_hw_addr_get)
                return 0;

        err = port->ops->port_fn_hw_addr_get(port, hw_addr, &hw_addr_len,
                                             extack);
        if (err) {
                if (err == -EOPNOTSUPP)
                        return 0;
                return err;
        }
        err = nla_put(msg, DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR, hw_addr_len, hw_addr);
        if (err)
                return err;
        *msg_updated = true;
        return 0;
}

static bool
devlink_port_fn_state_valid(enum devlink_port_fn_state state)
{
        return state == DEVLINK_PORT_FN_STATE_INACTIVE ||
               state == DEVLINK_PORT_FN_STATE_ACTIVE;
}

static bool
devlink_port_fn_opstate_valid(enum devlink_port_fn_opstate opstate)
{
        return opstate == DEVLINK_PORT_FN_OPSTATE_DETACHED ||
               opstate == DEVLINK_PORT_FN_OPSTATE_ATTACHED;
}

static int devlink_port_fn_state_fill(struct devlink_port *port,
                                      struct sk_buff *msg,
                                      struct netlink_ext_ack *extack,
                                      bool *msg_updated)
{
        enum devlink_port_fn_opstate opstate;
        enum devlink_port_fn_state state;
        int err;

        if (!port->ops->port_fn_state_get)
                return 0;

        err = port->ops->port_fn_state_get(port, &state, &opstate, extack);
        if (err) {
                if (err == -EOPNOTSUPP)
                        return 0;
                return err;
        }
        if (!devlink_port_fn_state_valid(state)) {
                WARN_ON_ONCE(1);
                NL_SET_ERR_MSG(extack, "Invalid state read from driver");
                return -EINVAL;
        }
        if (!devlink_port_fn_opstate_valid(opstate)) {
                WARN_ON_ONCE(1);
                NL_SET_ERR_MSG(extack, "Invalid operational state read from driver");
                return -EINVAL;
        }
        if (nla_put_u8(msg, DEVLINK_PORT_FN_ATTR_STATE, state) ||
            nla_put_u8(msg, DEVLINK_PORT_FN_ATTR_OPSTATE, opstate))
                return -EMSGSIZE;
        *msg_updated = true;
        return 0;
}

static int
devlink_port_fn_mig_set(struct devlink_port *devlink_port, bool enable,
                        struct netlink_ext_ack *extack)
{
        return devlink_port->ops->port_fn_migratable_set(devlink_port, enable,
                                                         extack);
}

static int
devlink_port_fn_roce_set(struct devlink_port *devlink_port, bool enable,
                         struct netlink_ext_ack *extack)
{
        return devlink_port->ops->port_fn_roce_set(devlink_port, enable,
                                                   extack);
}

static int
devlink_port_fn_ipsec_crypto_set(struct devlink_port *devlink_port, bool enable,
                                 struct netlink_ext_ack *extack)
{
        return devlink_port->ops->port_fn_ipsec_crypto_set(devlink_port, enable, extack);
}

static int
devlink_port_fn_ipsec_packet_set(struct devlink_port *devlink_port, bool enable,
                                 struct netlink_ext_ack *extack)
{
        return devlink_port->ops->port_fn_ipsec_packet_set(devlink_port, enable, extack);
}

static int devlink_port_fn_caps_set(struct devlink_port *devlink_port,
                                    const struct nlattr *attr,
                                    struct netlink_ext_ack *extack)
{
        struct nla_bitfield32 caps;
        u32 caps_value;
        int err;

        caps = nla_get_bitfield32(attr);
        caps_value = caps.value & caps.selector;
        if (caps.selector & DEVLINK_PORT_FN_CAP_ROCE) {
                err = devlink_port_fn_roce_set(devlink_port,
                                               caps_value & DEVLINK_PORT_FN_CAP_ROCE,
                                               extack);
                if (err)
                        return err;
        }
        if (caps.selector & DEVLINK_PORT_FN_CAP_MIGRATABLE) {
                err = devlink_port_fn_mig_set(devlink_port, caps_value &
                                              DEVLINK_PORT_FN_CAP_MIGRATABLE,
                                              extack);
                if (err)
                        return err;
        }
        if (caps.selector & DEVLINK_PORT_FN_CAP_IPSEC_CRYPTO) {
                err = devlink_port_fn_ipsec_crypto_set(devlink_port, caps_value &
                                                       DEVLINK_PORT_FN_CAP_IPSEC_CRYPTO,
                                                       extack);
                if (err)
                        return err;
        }
        if (caps.selector & DEVLINK_PORT_FN_CAP_IPSEC_PACKET) {
                err = devlink_port_fn_ipsec_packet_set(devlink_port, caps_value &
                                                       DEVLINK_PORT_FN_CAP_IPSEC_PACKET,
                                                       extack);
                if (err)
                        return err;
        }
        return 0;
}

static int
devlink_port_fn_max_io_eqs_set(struct devlink_port *devlink_port,
                               const struct nlattr *attr,
                               struct netlink_ext_ack *extack)
{
        u32 max_io_eqs;

        max_io_eqs = nla_get_u32(attr);
        return devlink_port->ops->port_fn_max_io_eqs_set(devlink_port,
                                                         max_io_eqs, extack);
}

static int
devlink_nl_port_function_attrs_put(struct sk_buff *msg, struct devlink_port *port,
                                   struct netlink_ext_ack *extack)
{
        struct nlattr *function_attr;
        bool msg_updated = false;
        int err;

        function_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_PORT_FUNCTION);
        if (!function_attr)
                return -EMSGSIZE;

        err = devlink_port_fn_hw_addr_fill(port, msg, extack, &msg_updated);
        if (err)
                goto out;
        err = devlink_port_fn_caps_fill(port, msg, extack, &msg_updated);
        if (err)
                goto out;
        err = devlink_port_fn_state_fill(port, msg, extack, &msg_updated);
        if (err)
                goto out;
        err = devlink_port_fn_max_io_eqs_fill(port, msg, extack, &msg_updated);
        if (err)
                goto out;
        err = devlink_rel_devlink_handle_put(msg, port->devlink,
                                             port->rel_index,
                                             DEVLINK_PORT_FN_ATTR_DEVLINK,
                                             &msg_updated);

out:
        if (err || !msg_updated)
                nla_nest_cancel(msg, function_attr);
        else
                nla_nest_end(msg, function_attr);
        return err;
}

static int devlink_nl_port_fill(struct sk_buff *msg,
                                struct devlink_port *devlink_port,
                                enum devlink_command cmd, u32 portid, u32 seq,
                                int flags, struct netlink_ext_ack *extack)
{
        struct devlink *devlink = devlink_port->devlink;
        void *hdr;

        hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
        if (!hdr)
                return -EMSGSIZE;

        if (devlink_nl_put_handle(msg, devlink))
                goto nla_put_failure;
        if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX, devlink_port->index))
                goto nla_put_failure;

        spin_lock_bh(&devlink_port->type_lock);
        if (nla_put_u16(msg, DEVLINK_ATTR_PORT_TYPE, devlink_port->type))
                goto nla_put_failure_type_locked;
        if (devlink_port->desired_type != DEVLINK_PORT_TYPE_NOTSET &&
            nla_put_u16(msg, DEVLINK_ATTR_PORT_DESIRED_TYPE,
                        devlink_port->desired_type))
                goto nla_put_failure_type_locked;
        if (devlink_port->type == DEVLINK_PORT_TYPE_ETH) {
                if (devlink_port->type_eth.netdev &&
                    (nla_put_u32(msg, DEVLINK_ATTR_PORT_NETDEV_IFINDEX,
                                 devlink_port->type_eth.ifindex) ||
                     nla_put_string(msg, DEVLINK_ATTR_PORT_NETDEV_NAME,
                                    devlink_port->type_eth.ifname)))
                        goto nla_put_failure_type_locked;
        }
        if (devlink_port->type == DEVLINK_PORT_TYPE_IB) {
                struct ib_device *ibdev = devlink_port->type_ib.ibdev;

                if (ibdev &&
                    nla_put_string(msg, DEVLINK_ATTR_PORT_IBDEV_NAME,
                                   ibdev->name))
                        goto nla_put_failure_type_locked;
        }
        spin_unlock_bh(&devlink_port->type_lock);
        if (devlink_nl_port_attrs_put(msg, devlink_port))
                goto nla_put_failure;
        if (devlink_nl_port_function_attrs_put(msg, devlink_port, extack))
                goto nla_put_failure;
        if (devlink_port->linecard &&
            nla_put_u32(msg, DEVLINK_ATTR_LINECARD_INDEX,
                        devlink_linecard_index(devlink_port->linecard)))
                goto nla_put_failure;

        genlmsg_end(msg, hdr);
        return 0;

nla_put_failure_type_locked:
        spin_unlock_bh(&devlink_port->type_lock);
nla_put_failure:
        genlmsg_cancel(msg, hdr);
        return -EMSGSIZE;
}

static void devlink_port_notify(struct devlink_port *devlink_port,
                                enum devlink_command cmd)
{
        struct devlink *devlink = devlink_port->devlink;
        struct devlink_obj_desc desc;
        struct sk_buff *msg;
        int err;

        WARN_ON(cmd != DEVLINK_CMD_PORT_NEW && cmd != DEVLINK_CMD_PORT_DEL);

        if (!__devl_is_registered(devlink) || !devlink_nl_notify_need(devlink))
                return;

        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
                return;

        err = devlink_nl_port_fill(msg, devlink_port, cmd, 0, 0, 0, NULL);
        if (err) {
                nlmsg_free(msg);
                return;
        }

        devlink_nl_obj_desc_init(&desc, devlink);
        devlink_nl_obj_desc_port_set(&desc, devlink_port);
        devlink_nl_notify_send_desc(devlink, msg, &desc);
}

static void devlink_ports_notify(struct devlink *devlink,
                                 enum devlink_command cmd)
{
        struct devlink_port *devlink_port;
        unsigned long port_index;

        xa_for_each(&devlink->ports, port_index, devlink_port)
                devlink_port_notify(devlink_port, cmd);
}

void devlink_ports_notify_register(struct devlink *devlink)
{
        devlink_ports_notify(devlink, DEVLINK_CMD_PORT_NEW);
}

void devlink_ports_notify_unregister(struct devlink *devlink)
{
        devlink_ports_notify(devlink, DEVLINK_CMD_PORT_DEL);
}

int devlink_nl_port_get_doit(struct sk_buff *skb, struct genl_info *info)
{
        struct devlink_port *devlink_port = info->user_ptr[1];
        struct sk_buff *msg;
        int err;

        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
                return -ENOMEM;

        err = devlink_nl_port_fill(msg, devlink_port, DEVLINK_CMD_PORT_NEW,
                                   info->snd_portid, info->snd_seq, 0,
                                   info->extack);
        if (err) {
                nlmsg_free(msg);
                return err;
        }

        return genlmsg_reply(msg, info);
}

static int
devlink_nl_port_get_dump_one(struct sk_buff *msg, struct devlink *devlink,
                             struct netlink_callback *cb, int flags)
{
        struct devlink_nl_dump_state *state = devlink_dump_state(cb);
        struct devlink_port *devlink_port;
        unsigned long port_index;
        int err = 0;

        xa_for_each_start(&devlink->ports, port_index, devlink_port, state->idx) {
                err = devlink_nl_port_fill(msg, devlink_port,
                                           DEVLINK_CMD_PORT_NEW,
                                           NETLINK_CB(cb->skb).portid,
                                           cb->nlh->nlmsg_seq, flags,
                                           cb->extack);
                if (err) {
                        state->idx = port_index;
                        break;
                }
        }

        return err;
}

int devlink_nl_port_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
        return devlink_nl_dumpit(skb, cb, devlink_nl_port_get_dump_one);
}

static int devlink_port_type_set(struct devlink_port *devlink_port,
                                 enum devlink_port_type port_type)

{
        int err;

        if (!devlink_port->ops->port_type_set)
                return -EOPNOTSUPP;

        if (port_type == devlink_port->type)
                return 0;

        err = devlink_port->ops->port_type_set(devlink_port, port_type);
        if (err)
                return err;

        devlink_port->desired_type = port_type;
        devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW);
        return 0;
}

static int devlink_port_function_hw_addr_set(struct devlink_port *port,
                                             const struct nlattr *attr,
                                             struct netlink_ext_ack *extack)
{
        const u8 *hw_addr;
        int hw_addr_len;

        hw_addr = nla_data(attr);
        hw_addr_len = nla_len(attr);
        if (hw_addr_len > MAX_ADDR_LEN) {
                NL_SET_ERR_MSG(extack, "Port function hardware address too long");
                return -EINVAL;
        }
        if (port->type == DEVLINK_PORT_TYPE_ETH) {
                if (hw_addr_len != ETH_ALEN) {
                        NL_SET_ERR_MSG(extack, "Address must be 6 bytes for Ethernet device");
                        return -EINVAL;
                }
                if (!is_unicast_ether_addr(hw_addr)) {
                        NL_SET_ERR_MSG(extack, "Non-unicast hardware address unsupported");
                        return -EINVAL;
                }
        }

        return port->ops->port_fn_hw_addr_set(port, hw_addr, hw_addr_len,
                                              extack);
}

static int devlink_port_fn_state_set(struct devlink_port *port,
                                     const struct nlattr *attr,
                                     struct netlink_ext_ack *extack)
{
        enum devlink_port_fn_state state;

        state = nla_get_u8(attr);
        return port->ops->port_fn_state_set(port, state, extack);
}

static int devlink_port_function_validate(struct devlink_port *devlink_port,
                                          struct nlattr **tb,
                                          struct netlink_ext_ack *extack)
{
        const struct devlink_port_ops *ops = devlink_port->ops;
        struct nlattr *attr;

        if (tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR] &&
            !ops->port_fn_hw_addr_set) {
                NL_SET_ERR_MSG_ATTR(extack, tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR],
                                    "Port doesn't support function attributes");
                return -EOPNOTSUPP;
        }
        if (tb[DEVLINK_PORT_FN_ATTR_STATE] && !ops->port_fn_state_set) {
                NL_SET_ERR_MSG_ATTR(extack, tb[DEVLINK_PORT_FN_ATTR_STATE],
                                    "Function does not support state setting");
                return -EOPNOTSUPP;
        }
        attr = tb[DEVLINK_PORT_FN_ATTR_CAPS];
        if (attr) {
                struct nla_bitfield32 caps;

                caps = nla_get_bitfield32(attr);
                if (caps.selector & DEVLINK_PORT_FN_CAP_ROCE &&
                    !ops->port_fn_roce_set) {
                        NL_SET_ERR_MSG_ATTR(extack, attr,
                                            "Port doesn't support RoCE function attribute");
                        return -EOPNOTSUPP;
                }
                if (caps.selector & DEVLINK_PORT_FN_CAP_MIGRATABLE) {
                        if (!ops->port_fn_migratable_set) {
                                NL_SET_ERR_MSG_ATTR(extack, attr,
                                                    "Port doesn't support migratable function attribute");
                                return -EOPNOTSUPP;
                        }
                        if (devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_PCI_VF) {
                                NL_SET_ERR_MSG_ATTR(extack, attr,
                                                    "migratable function attribute supported for VFs only");
                                return -EOPNOTSUPP;
                        }
                }
                if (caps.selector & DEVLINK_PORT_FN_CAP_IPSEC_CRYPTO) {
                        if (!ops->port_fn_ipsec_crypto_set) {
                                NL_SET_ERR_MSG_ATTR(extack, attr,
                                                    "Port doesn't support ipsec_crypto function attribute");
                                return -EOPNOTSUPP;
                        }
                        if (devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_PCI_VF) {
                                NL_SET_ERR_MSG_ATTR(extack, attr,
                                                    "ipsec_crypto function attribute supported for VFs only");
                                return -EOPNOTSUPP;
                        }
                }
                if (caps.selector & DEVLINK_PORT_FN_CAP_IPSEC_PACKET) {
                        if (!ops->port_fn_ipsec_packet_set) {
                                NL_SET_ERR_MSG_ATTR(extack, attr,
                                                    "Port doesn't support ipsec_packet function attribute");
                                return -EOPNOTSUPP;
                        }
                        if (devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_PCI_VF) {
                                NL_SET_ERR_MSG_ATTR(extack, attr,
                                                    "ipsec_packet function attribute supported for VFs only");
                                return -EOPNOTSUPP;
                        }
                }
        }
        if (tb[DEVLINK_PORT_FN_ATTR_MAX_IO_EQS] &&
            !ops->port_fn_max_io_eqs_set) {
                NL_SET_ERR_MSG_ATTR(extack, tb[DEVLINK_PORT_FN_ATTR_MAX_IO_EQS],
                                    "Function does not support max_io_eqs setting");
                return -EOPNOTSUPP;
        }
        return 0;
}

static int devlink_port_function_set(struct devlink_port *port,
                                     const struct nlattr *attr,
                                     struct netlink_ext_ack *extack)
{
        struct nlattr *tb[DEVLINK_PORT_FUNCTION_ATTR_MAX + 1];
        int err;

        err = nla_parse_nested(tb, DEVLINK_PORT_FUNCTION_ATTR_MAX, attr,
                               devlink_function_nl_policy, extack);
        if (err < 0) {
                NL_SET_ERR_MSG(extack, "Fail to parse port function attributes");
                return err;
        }

        err = devlink_port_function_validate(port, tb, extack);
        if (err)
                return err;

        attr = tb[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR];
        if (attr) {
                err = devlink_port_function_hw_addr_set(port, attr, extack);
                if (err)
                        return err;
        }

        attr = tb[DEVLINK_PORT_FN_ATTR_CAPS];
        if (attr) {
                err = devlink_port_fn_caps_set(port, attr, extack);
                if (err)
                        return err;
        }

        attr = tb[DEVLINK_PORT_FN_ATTR_MAX_IO_EQS];
        if (attr) {
                err = devlink_port_fn_max_io_eqs_set(port, attr, extack);
                if (err)
                        return err;
        }

        /* Keep this as the last function attribute set, so that when
         * multiple port function attributes are set along with state,
         * Those can be applied first before activating the state.
         */
        attr = tb[DEVLINK_PORT_FN_ATTR_STATE];
        if (attr)
                err = devlink_port_fn_state_set(port, attr, extack);

        if (!err)
                devlink_port_notify(port, DEVLINK_CMD_PORT_NEW);
        return err;
}

int devlink_nl_port_set_doit(struct sk_buff *skb, struct genl_info *info)
{
        struct devlink_port *devlink_port = info->user_ptr[1];
        int err;

        if (info->attrs[DEVLINK_ATTR_PORT_TYPE]) {
                enum devlink_port_type port_type;

                port_type = nla_get_u16(info->attrs[DEVLINK_ATTR_PORT_TYPE]);
                err = devlink_port_type_set(devlink_port, port_type);
                if (err)
                        return err;
        }

        if (info->attrs[DEVLINK_ATTR_PORT_FUNCTION]) {
                struct nlattr *attr = info->attrs[DEVLINK_ATTR_PORT_FUNCTION];
                struct netlink_ext_ack *extack = info->extack;

                err = devlink_port_function_set(devlink_port, attr, extack);
                if (err)
                        return err;
        }

        return 0;
}

int devlink_nl_port_split_doit(struct sk_buff *skb, struct genl_info *info)
{
        struct devlink_port *devlink_port = info->user_ptr[1];
        struct devlink *devlink = info->user_ptr[0];
        u32 count;

        if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_PORT_SPLIT_COUNT))
                return -EINVAL;
        if (!devlink_port->ops->port_split)
                return -EOPNOTSUPP;

        count = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_SPLIT_COUNT]);

        if (!devlink_port->attrs.splittable) {
                /* Split ports cannot be split. */
                if (devlink_port->attrs.split)
                        NL_SET_ERR_MSG(info->extack, "Port cannot be split further");
                else
                        NL_SET_ERR_MSG(info->extack, "Port cannot be split");
                return -EINVAL;
        }

        if (count < 2 || !is_power_of_2(count) || count > devlink_port->attrs.lanes) {
                NL_SET_ERR_MSG(info->extack, "Invalid split count");
                return -EINVAL;
        }

        return devlink_port->ops->port_split(devlink, devlink_port, count,
                                             info->extack);
}

int devlink_nl_port_unsplit_doit(struct sk_buff *skb, struct genl_info *info)
{
        struct devlink_port *devlink_port = info->user_ptr[1];
        struct devlink *devlink = info->user_ptr[0];

        if (!devlink_port->ops->port_unsplit)
                return -EOPNOTSUPP;
        return devlink_port->ops->port_unsplit(devlink, devlink_port, info->extack);
}

int devlink_nl_port_new_doit(struct sk_buff *skb, struct genl_info *info)
{
        struct netlink_ext_ack *extack = info->extack;
        struct devlink_port_new_attrs new_attrs = {};
        struct devlink *devlink = info->user_ptr[0];
        struct devlink_port *devlink_port;
        struct sk_buff *msg;
        int err;

        if (!devlink->ops->port_new)
                return -EOPNOTSUPP;

        if (!info->attrs[DEVLINK_ATTR_PORT_FLAVOUR] ||
            !info->attrs[DEVLINK_ATTR_PORT_PCI_PF_NUMBER]) {
                NL_SET_ERR_MSG(extack, "Port flavour or PCI PF are not specified");
                return -EINVAL;
        }
        new_attrs.flavour = nla_get_u16(info->attrs[DEVLINK_ATTR_PORT_FLAVOUR]);
        new_attrs.pfnum =
                nla_get_u16(info->attrs[DEVLINK_ATTR_PORT_PCI_PF_NUMBER]);

        if (info->attrs[DEVLINK_ATTR_PORT_INDEX]) {
                /* Port index of the new port being created by driver. */
                new_attrs.port_index =
                        nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
                new_attrs.port_index_valid = true;
        }
        if (info->attrs[DEVLINK_ATTR_PORT_CONTROLLER_NUMBER]) {
                new_attrs.controller =
                        nla_get_u16(info->attrs[DEVLINK_ATTR_PORT_CONTROLLER_NUMBER]);
                new_attrs.controller_valid = true;
        }
        if (new_attrs.flavour == DEVLINK_PORT_FLAVOUR_PCI_SF &&
            info->attrs[DEVLINK_ATTR_PORT_PCI_SF_NUMBER]) {
                new_attrs.sfnum = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_PCI_SF_NUMBER]);
                new_attrs.sfnum_valid = true;
        }

        err = devlink->ops->port_new(devlink, &new_attrs,
                                     extack, &devlink_port);
        if (err)
                return err;

        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg) {
                err = -ENOMEM;
                goto err_out_port_del;
        }
        err = devlink_nl_port_fill(msg, devlink_port, DEVLINK_CMD_PORT_NEW,
                                   info->snd_portid, info->snd_seq, 0, NULL);
        if (WARN_ON_ONCE(err))
                goto err_out_msg_free;
        err = genlmsg_reply(msg, info);
        if (err)
                goto err_out_port_del;
        return 0;

err_out_msg_free:
        nlmsg_free(msg);
err_out_port_del:
        devlink_port->ops->port_del(devlink, devlink_port, NULL);
        return err;
}

int devlink_nl_port_del_doit(struct sk_buff *skb, struct genl_info *info)
{
        struct devlink_port *devlink_port = info->user_ptr[1];
        struct netlink_ext_ack *extack = info->extack;
        struct devlink *devlink = info->user_ptr[0];

        if (!devlink_port->ops->port_del)
                return -EOPNOTSUPP;

        return devlink_port->ops->port_del(devlink, devlink_port, extack);
}

static void devlink_port_type_warn(struct work_struct *work)
{
        struct devlink_port *port = container_of(to_delayed_work(work),
                                                 struct devlink_port,
                                                 type_warn_dw);
        dev_warn(port->devlink->dev, "Type was not set for devlink port.");
}

static bool devlink_port_type_should_warn(struct devlink_port *devlink_port)
{
        /* Ignore CPU and DSA flavours. */
        return devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_CPU &&
               devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_DSA &&
               devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_UNUSED;
}

#define DEVLINK_PORT_TYPE_WARN_TIMEOUT (HZ * 3600)

static void devlink_port_type_warn_schedule(struct devlink_port *devlink_port)
{
        if (!devlink_port_type_should_warn(devlink_port))
                return;
        /* Schedule a work to WARN in case driver does not set port
         * type within timeout.
         */
        schedule_delayed_work(&devlink_port->type_warn_dw,
                              DEVLINK_PORT_TYPE_WARN_TIMEOUT);
}

static void devlink_port_type_warn_cancel(struct devlink_port *devlink_port)
{
        if (!devlink_port_type_should_warn(devlink_port))
                return;
        cancel_delayed_work_sync(&devlink_port->type_warn_dw);
}

/**
 * devlink_port_init() - Init devlink port
 *
 * @devlink: devlink
 * @devlink_port: devlink port
 *
 * Initialize essential stuff that is needed for functions
 * that may be called before devlink port registration.
 * Call to this function is optional and not needed
 * in case the driver does not use such functions.
 */
void devlink_port_init(struct devlink *devlink,
                       struct devlink_port *devlink_port)
{
        if (devlink_port->initialized)
                return;
        devlink_port->devlink = devlink;
        INIT_LIST_HEAD(&devlink_port->region_list);
        devlink_port->initialized = true;
}
EXPORT_SYMBOL_GPL(devlink_port_init);

/**
 * devlink_port_fini() - Deinitialize devlink port
 *
 * @devlink_port: devlink port
 *
 * Deinitialize essential stuff that is in use for functions
 * that may be called after devlink port unregistration.
 * Call to this function is optional and not needed
 * in case the driver does not use such functions.
 */
void devlink_port_fini(struct devlink_port *devlink_port)
{
        WARN_ON(!list_empty(&devlink_port->region_list));
}
EXPORT_SYMBOL_GPL(devlink_port_fini);

static const struct devlink_port_ops devlink_port_dummy_ops = {};

/**
 * devl_port_register_with_ops() - Register devlink port
 *
 * @devlink: devlink
 * @devlink_port: devlink port
 * @port_index: driver-specific numerical identifier of the port
 * @ops: port ops
 *
 * Register devlink port with provided port index. User can use
 * any indexing, even hw-related one. devlink_port structure
 * is convenient to be embedded inside user driver private structure.
 * Note that the caller should take care of zeroing the devlink_port
 * structure.
 */
int devl_port_register_with_ops(struct devlink *devlink,
                                struct devlink_port *devlink_port,
                                unsigned int port_index,
                                const struct devlink_port_ops *ops)
{
        int err;

        devl_assert_locked(devlink);

        ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port);

        devlink_port_init(devlink, devlink_port);
        devlink_port->registered = true;
        devlink_port->index = port_index;
        devlink_port->ops = ops ? ops : &devlink_port_dummy_ops;
        spin_lock_init(&devlink_port->type_lock);
        INIT_LIST_HEAD(&devlink_port->reporter_list);
        err = xa_insert(&devlink->ports, port_index, devlink_port, GFP_KERNEL);
        if (err) {
                devlink_port->registered = false;
                return err;
        }

        INIT_DELAYED_WORK(&devlink_port->type_warn_dw, &devlink_port_type_warn);
        devlink_port_type_warn_schedule(devlink_port);
        devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW);
        return 0;
}
EXPORT_SYMBOL_GPL(devl_port_register_with_ops);

/**
 *      devlink_port_register_with_ops - Register devlink port
 *
 *      @devlink: devlink
 *      @devlink_port: devlink port
 *      @port_index: driver-specific numerical identifier of the port
 *      @ops: port ops
 *
 *      Register devlink port with provided port index. User can use
 *      any indexing, even hw-related one. devlink_port structure
 *      is convenient to be embedded inside user driver private structure.
 *      Note that the caller should take care of zeroing the devlink_port
 *      structure.
 *
 *      Context: Takes and release devlink->lock <mutex>.
 */
int devlink_port_register_with_ops(struct devlink *devlink,
                                   struct devlink_port *devlink_port,
                                   unsigned int port_index,
                                   const struct devlink_port_ops *ops)
{
        int err;

        devl_lock(devlink);
        err = devl_port_register_with_ops(devlink, devlink_port,
                                          port_index, ops);
        devl_unlock(devlink);
        return err;
}
EXPORT_SYMBOL_GPL(devlink_port_register_with_ops);

/**
 * devl_port_unregister() - Unregister devlink port
 *
 * @devlink_port: devlink port
 */
void devl_port_unregister(struct devlink_port *devlink_port)
{
        lockdep_assert_held(&devlink_port->devlink->lock);
        WARN_ON(devlink_port->type != DEVLINK_PORT_TYPE_NOTSET);

        devlink_port_type_warn_cancel(devlink_port);
        devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_DEL);
        xa_erase(&devlink_port->devlink->ports, devlink_port->index);
        WARN_ON(!list_empty(&devlink_port->reporter_list));
        devlink_port->registered = false;
}
EXPORT_SYMBOL_GPL(devl_port_unregister);

/**
 *      devlink_port_unregister - Unregister devlink port
 *
 *      @devlink_port: devlink port
 *
 *      Context: Takes and release devlink->lock <mutex>.
 */
void devlink_port_unregister(struct devlink_port *devlink_port)
{
        struct devlink *devlink = devlink_port->devlink;

        devl_lock(devlink);
        devl_port_unregister(devlink_port);
        devl_unlock(devlink);
}
EXPORT_SYMBOL_GPL(devlink_port_unregister);

static void devlink_port_type_netdev_checks(struct devlink_port *devlink_port,
                                            struct net_device *netdev)
{
        const struct net_device_ops *ops = netdev->netdev_ops;

        /* If driver registers devlink port, it should set devlink port
         * attributes accordingly so the compat functions are called
         * and the original ops are not used.
         */
        if (ops->ndo_get_phys_port_name) {
                /* Some drivers use the same set of ndos for netdevs
                 * that have devlink_port registered and also for
                 * those who don't. Make sure that ndo_get_phys_port_name
                 * returns -EOPNOTSUPP here in case it is defined.
                 * Warn if not.
                 */
                char name[IFNAMSIZ];
                int err;

                err = ops->ndo_get_phys_port_name(netdev, name, sizeof(name));
                WARN_ON(err != -EOPNOTSUPP);
        }
        if (ops->ndo_get_port_parent_id) {
                /* Some drivers use the same set of ndos for netdevs
                 * that have devlink_port registered and also for
                 * those who don't. Make sure that ndo_get_port_parent_id
                 * returns -EOPNOTSUPP here in case it is defined.
                 * Warn if not.
                 */
                struct netdev_phys_item_id ppid;
                int err;

                err = ops->ndo_get_port_parent_id(netdev, &ppid);
                WARN_ON(err != -EOPNOTSUPP);
        }
}

static void __devlink_port_type_set(struct devlink_port *devlink_port,
                                    enum devlink_port_type type,
                                    void *type_dev)
{
        struct net_device *netdev = type_dev;

        ASSERT_DEVLINK_PORT_REGISTERED(devlink_port);

        if (type == DEVLINK_PORT_TYPE_NOTSET) {
                devlink_port_type_warn_schedule(devlink_port);
        } else {
                devlink_port_type_warn_cancel(devlink_port);
                if (type == DEVLINK_PORT_TYPE_ETH && netdev)
                        devlink_port_type_netdev_checks(devlink_port, netdev);
        }

        spin_lock_bh(&devlink_port->type_lock);
        devlink_port->type = type;
        switch (type) {
        case DEVLINK_PORT_TYPE_ETH:
                devlink_port->type_eth.netdev = netdev;
                if (netdev) {
                        ASSERT_RTNL();
                        devlink_port->type_eth.ifindex = netdev->ifindex;
                        BUILD_BUG_ON(sizeof(devlink_port->type_eth.ifname) !=
                                     sizeof(netdev->name));
                        strcpy(devlink_port->type_eth.ifname, netdev->name);
                }
                break;
        case DEVLINK_PORT_TYPE_IB:
                devlink_port->type_ib.ibdev = type_dev;
                break;
        default:
                break;
        }
        spin_unlock_bh(&devlink_port->type_lock);
        devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW);
}

/**
 *      devlink_port_type_eth_set - Set port type to Ethernet
 *
 *      @devlink_port: devlink port
 *
 *      If driver is calling this, most likely it is doing something wrong.
 */
void devlink_port_type_eth_set(struct devlink_port *devlink_port)
{
        dev_warn(devlink_port->devlink->dev,
                 "devlink port type for port %d set to Ethernet without a software interface reference, device type not supported by the kernel?\n",
                 devlink_port->index);
        __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, NULL);
}
EXPORT_SYMBOL_GPL(devlink_port_type_eth_set);

/**
 *      devlink_port_type_ib_set - Set port type to InfiniBand
 *
 *      @devlink_port: devlink port
 *      @ibdev: related IB device
 */
void devlink_port_type_ib_set(struct devlink_port *devlink_port,
                              struct ib_device *ibdev)
{
        __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_IB, ibdev);
}
EXPORT_SYMBOL_GPL(devlink_port_type_ib_set);

/**
 *      devlink_port_type_clear - Clear port type
 *
 *      @devlink_port: devlink port
 *
 *      If driver is calling this for clearing Ethernet type, most likely
 *      it is doing something wrong.
 */
void devlink_port_type_clear(struct devlink_port *devlink_port)
{
        if (devlink_port->type == DEVLINK_PORT_TYPE_ETH)
                dev_warn(devlink_port->devlink->dev,
                         "devlink port type for port %d cleared without a software interface reference, device type not supported by the kernel?\n",
                         devlink_port->index);
        __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_NOTSET, NULL);
}
EXPORT_SYMBOL_GPL(devlink_port_type_clear);

int devlink_port_netdevice_event(struct notifier_block *nb,
                                 unsigned long event, void *ptr)
{
        struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
        struct devlink_port *devlink_port = netdev->devlink_port;
        struct devlink *devlink;

        if (!devlink_port)
                return NOTIFY_OK;
        devlink = devlink_port->devlink;

        switch (event) {
        case NETDEV_POST_INIT:
                /* Set the type but not netdev pointer. It is going to be set
                 * later on by NETDEV_REGISTER event. Happens once during
                 * netdevice register
                 */
                __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH,
                                        NULL);
                break;
        case NETDEV_REGISTER:
        case NETDEV_CHANGENAME:
                if (devlink_net(devlink) != dev_net(netdev))
                        return NOTIFY_OK;
                /* Set the netdev on top of previously set type. Note this
                 * event happens also during net namespace change so here
                 * we take into account netdev pointer appearing in this
                 * namespace.
                 */
                __devlink_port_type_set(devlink_port, devlink_port->type,
                                        netdev);
                break;
        case NETDEV_UNREGISTER:
                if (devlink_net(devlink) != dev_net(netdev))
                        return NOTIFY_OK;
                /* Clear netdev pointer, but not the type. This event happens
                 * also during net namespace change so we need to clear
                 * pointer to netdev that is going to another net namespace.
                 */
                __devlink_port_type_set(devlink_port, devlink_port->type,
                                        NULL);
                break;
        case NETDEV_PRE_UNINIT:
                /* Clear the type and the netdev pointer. Happens one during
                 * netdevice unregister.
                 */
                __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_NOTSET,
                                        NULL);
                break;
        }

        return NOTIFY_OK;
}

static void __devlink_port_attrs_set(struct devlink_port *devlink_port,
                                     enum devlink_port_flavour flavour)
{
        struct devlink_port_attrs *attrs = &devlink_port->attrs;

        devlink_port->attrs_set = true;
        attrs->flavour = flavour;
        if (attrs->switch_id.id_len) {
                devlink_port->switch_port = true;
                if (WARN_ON(attrs->switch_id.id_len > MAX_PHYS_ITEM_ID_LEN))
                        attrs->switch_id.id_len = MAX_PHYS_ITEM_ID_LEN;
        } else {
                devlink_port->switch_port = false;
        }
}

/**
 *      devlink_port_attrs_set - Set port attributes
 *
 *      @devlink_port: devlink port
 *      @attrs: devlink port attrs
 */
void devlink_port_attrs_set(struct devlink_port *devlink_port,
                            const struct devlink_port_attrs *attrs)
{
        ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port);
        WARN_ON(attrs->splittable && attrs->split);

        devlink_port->attrs = *attrs;
        __devlink_port_attrs_set(devlink_port, attrs->flavour);
}
EXPORT_SYMBOL_GPL(devlink_port_attrs_set);

/**
 *      devlink_port_attrs_pci_pf_set - Set PCI PF port attributes
 *
 *      @devlink_port: devlink port
 *      @controller: associated controller number for the devlink port instance
 *      @pf: associated PCI function number for the devlink port instance
 *      @external: indicates if the port is for an external controller
 */
void devlink_port_attrs_pci_pf_set(struct devlink_port *devlink_port, u32 controller,
                                   u16 pf, bool external)
{
        struct devlink_port_attrs *attrs = &devlink_port->attrs;

        ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port);

        __devlink_port_attrs_set(devlink_port, DEVLINK_PORT_FLAVOUR_PCI_PF);
        attrs->pci_pf.controller = controller;
        attrs->pci_pf.pf = pf;
        attrs->pci_pf.external = external;
}
EXPORT_SYMBOL_GPL(devlink_port_attrs_pci_pf_set);

/**
 *      devlink_port_attrs_pci_vf_set - Set PCI VF port attributes
 *
 *      @devlink_port: devlink port
 *      @controller: associated controller number for the devlink port instance
 *      @pf: associated PCI function number for the devlink port instance
 *      @vf: associated PCI VF number of a PF for the devlink port instance;
 *           VF number starts from 0 for the first PCI virtual function
 *      @external: indicates if the port is for an external controller
 */
void devlink_port_attrs_pci_vf_set(struct devlink_port *devlink_port, u32 controller,
                                   u16 pf, u16 vf, bool external)
{
        struct devlink_port_attrs *attrs = &devlink_port->attrs;

        ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port);

        __devlink_port_attrs_set(devlink_port, DEVLINK_PORT_FLAVOUR_PCI_VF);
        attrs->pci_vf.controller = controller;
        attrs->pci_vf.pf = pf;
        attrs->pci_vf.vf = vf;
        attrs->pci_vf.external = external;
}
EXPORT_SYMBOL_GPL(devlink_port_attrs_pci_vf_set);

/**
 *      devlink_port_attrs_pci_sf_set - Set PCI SF port attributes
 *
 *      @devlink_port: devlink port
 *      @controller: associated controller number for the devlink port instance
 *      @pf: associated PCI function number for the devlink port instance
 *      @sf: associated SF number of a PF for the devlink port instance
 *      @external: indicates if the port is for an external controller
 */
void devlink_port_attrs_pci_sf_set(struct devlink_port *devlink_port, u32 controller,
                                   u16 pf, u32 sf, bool external)
{
        struct devlink_port_attrs *attrs = &devlink_port->attrs;

        ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port);

        __devlink_port_attrs_set(devlink_port, DEVLINK_PORT_FLAVOUR_PCI_SF);
        attrs->pci_sf.controller = controller;
        attrs->pci_sf.pf = pf;
        attrs->pci_sf.sf = sf;
        attrs->pci_sf.external = external;
}
EXPORT_SYMBOL_GPL(devlink_port_attrs_pci_sf_set);

static void devlink_port_rel_notify_cb(struct devlink *devlink, u32 port_index)
{
        struct devlink_port *devlink_port;

        devlink_port = devlink_port_get_by_index(devlink, port_index);
        if (!devlink_port)
                return;
        devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW);
}

static void devlink_port_rel_cleanup_cb(struct devlink *devlink, u32 port_index,
                                        u32 rel_index)
{
        struct devlink_port *devlink_port;

        devlink_port = devlink_port_get_by_index(devlink, port_index);
        if (devlink_port && devlink_port->rel_index == rel_index)
                devlink_port->rel_index = 0;
}

/**
 * devl_port_fn_devlink_set - Attach peer devlink
 *                            instance to port function.
 * @devlink_port: devlink port
 * @fn_devlink: devlink instance to attach
 */
int devl_port_fn_devlink_set(struct devlink_port *devlink_port,
                             struct devlink *fn_devlink)
{
        ASSERT_DEVLINK_PORT_REGISTERED(devlink_port);

        if (WARN_ON(devlink_port->attrs.flavour != DEVLINK_PORT_FLAVOUR_PCI_SF ||
                    devlink_port->attrs.pci_sf.external))
                return -EINVAL;

        return devlink_rel_nested_in_add(&devlink_port->rel_index,
                                         devlink_port->devlink->index,
                                         devlink_port->index,
                                         devlink_port_rel_notify_cb,
                                         devlink_port_rel_cleanup_cb,
                                         fn_devlink);
}
EXPORT_SYMBOL_GPL(devl_port_fn_devlink_set);

/**
 *      devlink_port_linecard_set - Link port with a linecard
 *
 *      @devlink_port: devlink port
 *      @linecard: devlink linecard
 */
void devlink_port_linecard_set(struct devlink_port *devlink_port,
                               struct devlink_linecard *linecard)
{
        ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port);

        devlink_port->linecard = linecard;
}
EXPORT_SYMBOL_GPL(devlink_port_linecard_set);

static int __devlink_port_phys_port_name_get(struct devlink_port *devlink_port,
                                             char *name, size_t len)
{
        struct devlink_port_attrs *attrs = &devlink_port->attrs;
        int n = 0;

        if (!devlink_port->attrs_set || devlink_port->attrs.no_phys_port_name)
                return -EOPNOTSUPP;

        switch (attrs->flavour) {
        case DEVLINK_PORT_FLAVOUR_PHYSICAL:
                if (devlink_port->linecard)
                        n = snprintf(name, len, "l%u",
                                     devlink_linecard_index(devlink_port->linecard));
                if (n < len)
                        n += snprintf(name + n, len - n, "p%u",
                                      attrs->phys.port_number);
                if (n < len && attrs->split)
                        n += snprintf(name + n, len - n, "s%u",
                                      attrs->phys.split_subport_number);
                break;
        case DEVLINK_PORT_FLAVOUR_CPU:
        case DEVLINK_PORT_FLAVOUR_DSA:
        case DEVLINK_PORT_FLAVOUR_UNUSED:
                /* As CPU and DSA ports do not have a netdevice associated
                 * case should not ever happen.
                 */
                WARN_ON(1);
                return -EINVAL;
        case DEVLINK_PORT_FLAVOUR_PCI_PF:
                if (attrs->pci_pf.external) {
                        n = snprintf(name, len, "c%u", attrs->pci_pf.controller);
                        if (n >= len)
                                return -EINVAL;
                        len -= n;
                        name += n;
                }
                n = snprintf(name, len, "pf%u", attrs->pci_pf.pf);
                break;
        case DEVLINK_PORT_FLAVOUR_PCI_VF:
                if (attrs->pci_vf.external) {
                        n = snprintf(name, len, "c%u", attrs->pci_vf.controller);
                        if (n >= len)
                                return -EINVAL;
                        len -= n;
                        name += n;
                }
                n = snprintf(name, len, "pf%uvf%u",
                             attrs->pci_vf.pf, attrs->pci_vf.vf);
                break;
        case DEVLINK_PORT_FLAVOUR_PCI_SF:
                if (attrs->pci_sf.external) {
                        n = snprintf(name, len, "c%u", attrs->pci_sf.controller);
                        if (n >= len)
                                return -EINVAL;
                        len -= n;
                        name += n;
                }
                n = snprintf(name, len, "pf%usf%u", attrs->pci_sf.pf,
                             attrs->pci_sf.sf);
                break;
        case DEVLINK_PORT_FLAVOUR_VIRTUAL:
                return -EOPNOTSUPP;
        }

        if (n >= len)
                return -EINVAL;

        return 0;
}

int devlink_compat_phys_port_name_get(struct net_device *dev,
                                      char *name, size_t len)
{
        struct devlink_port *devlink_port;

        /* RTNL mutex is held here which ensures that devlink_port
         * instance cannot disappear in the middle. No need to take
         * any devlink lock as only permanent values are accessed.
         */
        ASSERT_RTNL();

        devlink_port = dev->devlink_port;
        if (!devlink_port)
                return -EOPNOTSUPP;

        return __devlink_port_phys_port_name_get(devlink_port, name, len);
}

int devlink_compat_switch_id_get(struct net_device *dev,
                                 struct netdev_phys_item_id *ppid)
{
        struct devlink_port *devlink_port;

        /* Caller must hold RTNL mutex or reference to dev, which ensures that
         * devlink_port instance cannot disappear in the middle. No need to take
         * any devlink lock as only permanent values are accessed.
         */
        devlink_port = dev->devlink_port;
        if (!devlink_port || !devlink_port->switch_port)
                return -EOPNOTSUPP;

        memcpy(ppid, &devlink_port->attrs.switch_id, sizeof(*ppid));

        return 0;
}