enic_pp.c

Go to the documentation of this file.

/*
 * Copyright 2011 Cisco Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <net/ip.h>

#include "vnic_vic.h"
#include "enic_res.h"
#include "enic.h"
#include "enic_dev.h"
#include "enic_pp.h"

/*
 * Checks validity of vf index that came in
 * port profile request
 */
int enic_is_valid_pp_vf(struct enic *enic, int vf, int *err)
{
    if (vf != PORT_SELF_VF) {
#ifdef CONFIG_PCI_IOV
        if (enic_sriov_enabled(enic)) {
            if (vf < 0 || vf >= enic->num_vfs) {
                *err = -EINVAL;
                goto err_out;
            }
        } else {
            *err = -EOPNOTSUPP;
            goto err_out;
        }
#else
        *err = -EOPNOTSUPP;
        goto err_out;
#endif
    }

    if (vf == PORT_SELF_VF && !enic_is_dynamic(enic)) {
        *err = -EOPNOTSUPP;
        goto err_out;
    }

    *err = 0;
    return 1;

err_out:
    return 0;
}

static int enic_set_port_profile(struct enic *enic, int vf)
{
    struct net_device *netdev = enic->netdev;
    struct enic_port_profile *pp;
    struct vic_provinfo *vp;
    const u8 oui[3] = VIC_PROVINFO_CISCO_OUI;
    const __be16 os_type = htons(VIC_GENERIC_PROV_OS_TYPE_LINUX);
    char uuid_str[38];
    char client_mac_str[18];
    u8 *client_mac;
    int err;

    ENIC_PP_BY_INDEX(enic, vf, pp, &err);
    if (err)
        return err;

    if (!(pp->set & ENIC_SET_NAME) || !strlen(pp->name))
        return -EINVAL;

    vp = vic_provinfo_alloc(GFP_KERNEL, oui,
        VIC_PROVINFO_GENERIC_TYPE);
    if (!vp)
        return -ENOMEM;

    VIC_PROVINFO_ADD_TLV(vp,
        VIC_GENERIC_PROV_TLV_PORT_PROFILE_NAME_STR,
        strlen(pp->name) + 1, pp->name);

    if (!is_zero_ether_addr(pp->mac_addr)) {
        client_mac = pp->mac_addr;
    } else if (vf == PORT_SELF_VF) {
        client_mac = netdev->dev_addr;
    } else {
        netdev_err(netdev, "Cannot find pp mac address "
            "for VF %d\n", vf);
        err = -EINVAL;
        goto add_tlv_failure;
    }

    VIC_PROVINFO_ADD_TLV(vp,
        VIC_GENERIC_PROV_TLV_CLIENT_MAC_ADDR,
        ETH_ALEN, client_mac);

    snprintf(client_mac_str, sizeof(client_mac_str), "%pM", client_mac);
    VIC_PROVINFO_ADD_TLV(vp,
        VIC_GENERIC_PROV_TLV_CLUSTER_PORT_UUID_STR,
        sizeof(client_mac_str), client_mac_str);

    if (pp->set & ENIC_SET_INSTANCE) {
        sprintf(uuid_str, "%pUB", pp->instance_uuid);
        VIC_PROVINFO_ADD_TLV(vp,
            VIC_GENERIC_PROV_TLV_CLIENT_UUID_STR,
            sizeof(uuid_str), uuid_str);
    }

    if (pp->set & ENIC_SET_HOST) {
        sprintf(uuid_str, "%pUB", pp->host_uuid);
        VIC_PROVINFO_ADD_TLV(vp,
            VIC_GENERIC_PROV_TLV_HOST_UUID_STR,
            sizeof(uuid_str), uuid_str);
    }

    VIC_PROVINFO_ADD_TLV(vp,
        VIC_GENERIC_PROV_TLV_OS_TYPE,
        sizeof(os_type), &os_type);

    ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, vnic_dev_init_prov2, (u8 *)vp,
        vic_provinfo_size(vp));
    err = enic_dev_status_to_errno(err);

add_tlv_failure:
    vic_provinfo_free(vp);

    return err;
}

static int enic_unset_port_profile(struct enic *enic, int vf)
{
    int err;

    ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, vnic_dev_deinit);
    if (err)
        return enic_dev_status_to_errno(err);

    if (vf == PORT_SELF_VF)
        enic_reset_addr_lists(enic);

    return 0;
}

static int enic_are_pp_different(struct enic_port_profile *pp1,
        struct enic_port_profile *pp2)
{
    return strcmp(pp1->name, pp2->name) | !!memcmp(pp1->instance_uuid,
        pp2->instance_uuid, PORT_UUID_MAX) |
        !!memcmp(pp1->host_uuid, pp2->host_uuid, PORT_UUID_MAX) |
        !!memcmp(pp1->mac_addr, pp2->mac_addr, ETH_ALEN);
}

static int enic_pp_preassociate(struct enic *enic, int vf,
    struct enic_port_profile *prev_pp, int *restore_pp);
static int enic_pp_disassociate(struct enic *enic, int vf,
    struct enic_port_profile *prev_pp, int *restore_pp);
static int enic_pp_preassociate_rr(struct enic *enic, int vf,
    struct enic_port_profile *prev_pp, int *restore_pp);
static int enic_pp_associate(struct enic *enic, int vf,
    struct enic_port_profile *prev_pp, int *restore_pp);

static int (*enic_pp_handlers[])(struct enic *enic, int vf,
        struct enic_port_profile *prev_state,
        int *restore_pp) = {
    [PORT_REQUEST_PREASSOCIATE] = enic_pp_preassociate,
    [PORT_REQUEST_PREASSOCIATE_RR]  = enic_pp_preassociate_rr,
    [PORT_REQUEST_ASSOCIATE]    = enic_pp_associate,
    [PORT_REQUEST_DISASSOCIATE] = enic_pp_disassociate,
};

static const int enic_pp_handlers_count =
            ARRAY_SIZE(enic_pp_handlers);

static int enic_pp_preassociate(struct enic *enic, int vf,
    struct enic_port_profile *prev_pp, int *restore_pp)
{
    return -EOPNOTSUPP;
}

static int enic_pp_disassociate(struct enic *enic, int vf,
    struct enic_port_profile *prev_pp, int *restore_pp)
{
    struct net_device *netdev = enic->netdev;
    struct enic_port_profile *pp;
    int err;

    ENIC_PP_BY_INDEX(enic, vf, pp, &err);
    if (err)
        return err;

    /* Deregister mac addresses */
    if (!is_zero_ether_addr(pp->mac_addr))
        ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, vnic_dev_del_addr,
            pp->mac_addr);
    else if (vf == PORT_SELF_VF && !is_zero_ether_addr(netdev->dev_addr))
        ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, vnic_dev_del_addr,
            netdev->dev_addr);

    return enic_unset_port_profile(enic, vf);
}

static int enic_pp_preassociate_rr(struct enic *enic, int vf,
    struct enic_port_profile *prev_pp, int *restore_pp)
{
    struct enic_port_profile *pp;
    int err;
    int active = 0;

    ENIC_PP_BY_INDEX(enic, vf, pp, &err);
    if (err)
        return err;

    if (pp->request != PORT_REQUEST_ASSOCIATE) {
        /* If pre-associate is not part of an associate.
        We always disassociate first */
        err = enic_pp_handlers[PORT_REQUEST_DISASSOCIATE](enic, vf,
            prev_pp, restore_pp);
        if (err)
            return err;

        *restore_pp = 0;
    }

    *restore_pp = 0;

    err = enic_set_port_profile(enic, vf);
    if (err)
        return err;

    /* If pre-associate is not part of an associate. */
    if (pp->request != PORT_REQUEST_ASSOCIATE) {
        /* Enable device as standby */
        ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, vnic_dev_enable2,
            active);
        err = enic_dev_status_to_errno(err);
    }

    return err;
}

static int enic_pp_associate(struct enic *enic, int vf,
    struct enic_port_profile *prev_pp, int *restore_pp)
{
    struct net_device *netdev = enic->netdev;
    struct enic_port_profile *pp;
    int err;
    int active = 1;

    ENIC_PP_BY_INDEX(enic, vf, pp, &err);
    if (err)
        return err;

    /* Check if a pre-associate was called before */
    if (prev_pp->request != PORT_REQUEST_PREASSOCIATE_RR ||
        (prev_pp->request == PORT_REQUEST_PREASSOCIATE_RR &&
            enic_are_pp_different(prev_pp, pp))) {
        err = enic_pp_handlers[PORT_REQUEST_DISASSOCIATE](
            enic, vf, prev_pp, restore_pp);
        if (err)
            return err;

        *restore_pp = 0;
    }

    err = enic_pp_handlers[PORT_REQUEST_PREASSOCIATE_RR](
            enic, vf, prev_pp, restore_pp);
    if (err)
        return err;

    *restore_pp = 0;

    /* Enable device as active */
    ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, vnic_dev_enable2, active);
    err = enic_dev_status_to_errno(err);
    if (err)
        return err;

    /* Register mac address */
    if (!is_zero_ether_addr(pp->mac_addr))
        ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, vnic_dev_add_addr,
            pp->mac_addr);
    else if (vf == PORT_SELF_VF && !is_zero_ether_addr(netdev->dev_addr))
        ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, vnic_dev_add_addr,
            netdev->dev_addr);

    return 0;
}

int enic_process_set_pp_request(struct enic *enic, int vf,
    struct enic_port_profile *prev_pp, int *restore_pp)
{
    struct enic_port_profile *pp;
    int err;

    ENIC_PP_BY_INDEX(enic, vf, pp, &err);
    if (err)
        return err;

    if (pp->request >= enic_pp_handlers_count
        || !enic_pp_handlers[pp->request])
        return -EOPNOTSUPP;

    return enic_pp_handlers[pp->request](enic, vf, prev_pp, restore_pp);
}

int enic_process_get_pp_request(struct enic *enic, int vf,
    int request, u16 *response)
{
    int err, status = ERR_SUCCESS;

    switch (request) {

    case PORT_REQUEST_PREASSOCIATE_RR:
    case PORT_REQUEST_ASSOCIATE:
        ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
            vnic_dev_enable2_done, &status);
        break;

    case PORT_REQUEST_DISASSOCIATE:
        ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
            vnic_dev_deinit_done, &status);
        break;

    default:
        return -EINVAL;
    }

    if (err)
        status = err;

    switch (status) {
    case ERR_SUCCESS:
        *response = PORT_PROFILE_RESPONSE_SUCCESS;
        break;
    case ERR_EINVAL:
        *response = PORT_PROFILE_RESPONSE_INVALID;
        break;
    case ERR_EBADSTATE:
        *response = PORT_PROFILE_RESPONSE_BADSTATE;
        break;
    case ERR_ENOMEM:
        *response = PORT_PROFILE_RESPONSE_INSUFFICIENT_RESOURCES;
        break;
    case ERR_EINPROGRESS:
        *response = PORT_PROFILE_RESPONSE_INPROGRESS;
        break;
    default:
        *response = PORT_PROFILE_RESPONSE_ERROR;
        break;
    }

    return 0;
}