enic_res.c

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/*
 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova 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/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/netdevice.h>

#include "wq_enet_desc.h"
#include "rq_enet_desc.h"
#include "cq_enet_desc.h"
#include "vnic_resource.h"
#include "vnic_enet.h"
#include "vnic_dev.h"
#include "vnic_wq.h"
#include "vnic_rq.h"
#include "vnic_cq.h"
#include "vnic_intr.h"
#include "vnic_stats.h"
#include "vnic_nic.h"
#include "vnic_rss.h"
#include "enic_res.h"
#include "enic.h"

int enic_get_vnic_config(struct enic *enic)
{
    struct vnic_enet_config *c = &enic->config;
    int err;

    err = vnic_dev_get_mac_addr(enic->vdev, enic->mac_addr);
    if (err) {
        dev_err(enic_get_dev(enic),
            "Error getting MAC addr, %d\n", err);
        return err;
    }

#define GET_CONFIG(m) \
    do { \
        err = vnic_dev_spec(enic->vdev, \
            offsetof(struct vnic_enet_config, m), \
            sizeof(c->m), &c->m); \
        if (err) { \
            dev_err(enic_get_dev(enic), \
                "Error getting %s, %d\n", #m, err); \
            return err; \
        } \
    } while (0)

    GET_CONFIG(flags);
    GET_CONFIG(wq_desc_count);
    GET_CONFIG(rq_desc_count);
    GET_CONFIG(mtu);
    GET_CONFIG(intr_timer_type);
    GET_CONFIG(intr_mode);
    GET_CONFIG(intr_timer_usec);
    GET_CONFIG(loop_tag);

    c->wq_desc_count =
        min_t(u32, ENIC_MAX_WQ_DESCS,
        max_t(u32, ENIC_MIN_WQ_DESCS,
        c->wq_desc_count));
    c->wq_desc_count &= 0xffffffe0; /* must be aligned to groups of 32 */

    c->rq_desc_count =
        min_t(u32, ENIC_MAX_RQ_DESCS,
        max_t(u32, ENIC_MIN_RQ_DESCS,
        c->rq_desc_count));
    c->rq_desc_count &= 0xffffffe0; /* must be aligned to groups of 32 */

    if (c->mtu == 0)
        c->mtu = 1500;
    c->mtu = min_t(u16, ENIC_MAX_MTU,
        max_t(u16, ENIC_MIN_MTU,
        c->mtu));

    c->intr_timer_usec = min_t(u32, c->intr_timer_usec,
        vnic_dev_get_intr_coal_timer_max(enic->vdev));

    dev_info(enic_get_dev(enic),
        "vNIC MAC addr %pM wq/rq %d/%d mtu %d\n",
        enic->mac_addr, c->wq_desc_count, c->rq_desc_count, c->mtu);

    dev_info(enic_get_dev(enic), "vNIC csum tx/rx %s/%s "
        "tso/lro %s/%s rss %s intr mode %s type %s timer %d usec "
        "loopback tag 0x%04x\n",
        ENIC_SETTING(enic, TXCSUM) ? "yes" : "no",
        ENIC_SETTING(enic, RXCSUM) ? "yes" : "no",
        ENIC_SETTING(enic, TSO) ? "yes" : "no",
        ENIC_SETTING(enic, LRO) ? "yes" : "no",
        ENIC_SETTING(enic, RSS) ? "yes" : "no",
        c->intr_mode == VENET_INTR_MODE_INTX ? "INTx" :
        c->intr_mode == VENET_INTR_MODE_MSI ? "MSI" :
        c->intr_mode == VENET_INTR_MODE_ANY ? "any" :
        "unknown",
        c->intr_timer_type == VENET_INTR_TYPE_MIN ? "min" :
        c->intr_timer_type == VENET_INTR_TYPE_IDLE ? "idle" :
        "unknown",
        c->intr_timer_usec,
        c->loop_tag);

    return 0;
}

int enic_add_vlan(struct enic *enic, u16 vlanid)
{
    u64 a0 = vlanid, a1 = 0;
    int wait = 1000;
    int err;

    err = vnic_dev_cmd(enic->vdev, CMD_VLAN_ADD, &a0, &a1, wait);
    if (err)
        dev_err(enic_get_dev(enic), "Can't add vlan id, %d\n", err);

    return err;
}

int enic_del_vlan(struct enic *enic, u16 vlanid)
{
    u64 a0 = vlanid, a1 = 0;
    int wait = 1000;
    int err;

    err = vnic_dev_cmd(enic->vdev, CMD_VLAN_DEL, &a0, &a1, wait);
    if (err)
        dev_err(enic_get_dev(enic), "Can't delete vlan id, %d\n", err);

    return err;
}

int enic_set_nic_cfg(struct enic *enic, u8 rss_default_cpu, u8 rss_hash_type,
    u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable, u8 tso_ipid_split_en,
    u8 ig_vlan_strip_en)
{
    u64 a0, a1;
    u32 nic_cfg;
    int wait = 1000;

    vnic_set_nic_cfg(&nic_cfg, rss_default_cpu,
        rss_hash_type, rss_hash_bits, rss_base_cpu,
        rss_enable, tso_ipid_split_en, ig_vlan_strip_en);

    a0 = nic_cfg;
    a1 = 0;

    return vnic_dev_cmd(enic->vdev, CMD_NIC_CFG, &a0, &a1, wait);
}

int enic_set_rss_key(struct enic *enic, dma_addr_t key_pa, u64 len)
{
    u64 a0 = (u64)key_pa, a1 = len;
    int wait = 1000;

    return vnic_dev_cmd(enic->vdev, CMD_RSS_KEY, &a0, &a1, wait);
}

int enic_set_rss_cpu(struct enic *enic, dma_addr_t cpu_pa, u64 len)
{
    u64 a0 = (u64)cpu_pa, a1 = len;
    int wait = 1000;

    return vnic_dev_cmd(enic->vdev, CMD_RSS_CPU, &a0, &a1, wait);
}

void enic_free_vnic_resources(struct enic *enic)
{
    unsigned int i;

    for (i = 0; i < enic->wq_count; i++)
        vnic_wq_free(&enic->wq[i]);
    for (i = 0; i < enic->rq_count; i++)
        vnic_rq_free(&enic->rq[i]);
    for (i = 0; i < enic->cq_count; i++)
        vnic_cq_free(&enic->cq[i]);
    for (i = 0; i < enic->intr_count; i++)
        vnic_intr_free(&enic->intr[i]);
}

void enic_get_res_counts(struct enic *enic)
{
    enic->wq_count = vnic_dev_get_res_count(enic->vdev, RES_TYPE_WQ);
    enic->rq_count = vnic_dev_get_res_count(enic->vdev, RES_TYPE_RQ);
    enic->cq_count = vnic_dev_get_res_count(enic->vdev, RES_TYPE_CQ);
    enic->intr_count = vnic_dev_get_res_count(enic->vdev,
        RES_TYPE_INTR_CTRL);

    dev_info(enic_get_dev(enic),
        "vNIC resources avail: wq %d rq %d cq %d intr %d\n",
        enic->wq_count, enic->rq_count,
        enic->cq_count, enic->intr_count);
}

void enic_init_vnic_resources(struct enic *enic)
{
    enum vnic_dev_intr_mode intr_mode;
    unsigned int mask_on_assertion;
    unsigned int interrupt_offset;
    unsigned int error_interrupt_enable;
    unsigned int error_interrupt_offset;
    unsigned int cq_index;
    unsigned int i;

    intr_mode = vnic_dev_get_intr_mode(enic->vdev);

    /* Init RQ/WQ resources.
     *
     * RQ[0 - n-1] point to CQ[0 - n-1]
     * WQ[0 - m-1] point to CQ[n - n+m-1]
     *
     * Error interrupt is not enabled for MSI.
     */

    switch (intr_mode) {
    case VNIC_DEV_INTR_MODE_INTX:
    case VNIC_DEV_INTR_MODE_MSIX:
        error_interrupt_enable = 1;
        error_interrupt_offset = enic->intr_count - 2;
        break;
    default:
        error_interrupt_enable = 0;
        error_interrupt_offset = 0;
        break;
    }

    for (i = 0; i < enic->rq_count; i++) {
        cq_index = i;
        vnic_rq_init(&enic->rq[i],
            cq_index,
            error_interrupt_enable,
            error_interrupt_offset);
    }

    for (i = 0; i < enic->wq_count; i++) {
        cq_index = enic->rq_count + i;
        vnic_wq_init(&enic->wq[i],
            cq_index,
            error_interrupt_enable,
            error_interrupt_offset);
    }

    /* Init CQ resources
     *
     * CQ[0 - n+m-1] point to INTR[0] for INTx, MSI
     * CQ[0 - n+m-1] point to INTR[0 - n+m-1] for MSI-X
     */

    for (i = 0; i < enic->cq_count; i++) {

        switch (intr_mode) {
        case VNIC_DEV_INTR_MODE_MSIX:
            interrupt_offset = i;
            break;
        default:
            interrupt_offset = 0;
            break;
        }

        vnic_cq_init(&enic->cq[i],
            0 /* flow_control_enable */,
            1 /* color_enable */,
            0 /* cq_head */,
            0 /* cq_tail */,
            1 /* cq_tail_color */,
            1 /* interrupt_enable */,
            1 /* cq_entry_enable */,
            0 /* cq_message_enable */,
            interrupt_offset,
            0 /* cq_message_addr */);
    }

    /* Init INTR resources
     *
     * mask_on_assertion is not used for INTx due to the level-
     * triggered nature of INTx
     */

    switch (intr_mode) {
    case VNIC_DEV_INTR_MODE_MSI:
    case VNIC_DEV_INTR_MODE_MSIX:
        mask_on_assertion = 1;
        break;
    default:
        mask_on_assertion = 0;
        break;
    }

    for (i = 0; i < enic->intr_count; i++) {
        vnic_intr_init(&enic->intr[i],
            enic->config.intr_timer_usec,
            enic->config.intr_timer_type,
            mask_on_assertion);
    }
}

int enic_alloc_vnic_resources(struct enic *enic)
{
    enum vnic_dev_intr_mode intr_mode;
    unsigned int i;
    int err;

    intr_mode = vnic_dev_get_intr_mode(enic->vdev);

    dev_info(enic_get_dev(enic), "vNIC resources used:  "
        "wq %d rq %d cq %d intr %d intr mode %s\n",
        enic->wq_count, enic->rq_count,
        enic->cq_count, enic->intr_count,
        intr_mode == VNIC_DEV_INTR_MODE_INTX ? "legacy PCI INTx" :
        intr_mode == VNIC_DEV_INTR_MODE_MSI ? "MSI" :
        intr_mode == VNIC_DEV_INTR_MODE_MSIX ? "MSI-X" :
        "unknown");

    /* Allocate queue resources
     */

    for (i = 0; i < enic->wq_count; i++) {
        err = vnic_wq_alloc(enic->vdev, &enic->wq[i], i,
            enic->config.wq_desc_count,
            sizeof(struct wq_enet_desc));
        if (err)
            goto err_out_cleanup;
    }

    for (i = 0; i < enic->rq_count; i++) {
        err = vnic_rq_alloc(enic->vdev, &enic->rq[i], i,
            enic->config.rq_desc_count,
            sizeof(struct rq_enet_desc));
        if (err)
            goto err_out_cleanup;
    }

    for (i = 0; i < enic->cq_count; i++) {
        if (i < enic->rq_count)
            err = vnic_cq_alloc(enic->vdev, &enic->cq[i], i,
                enic->config.rq_desc_count,
                sizeof(struct cq_enet_rq_desc));
        else
            err = vnic_cq_alloc(enic->vdev, &enic->cq[i], i,
                enic->config.wq_desc_count,
                sizeof(struct cq_enet_wq_desc));
        if (err)
            goto err_out_cleanup;
    }

    for (i = 0; i < enic->intr_count; i++) {
        err = vnic_intr_alloc(enic->vdev, &enic->intr[i], i);
        if (err)
            goto err_out_cleanup;
    }

    /* Hook remaining resource
     */

    enic->legacy_pba = vnic_dev_get_res(enic->vdev,
        RES_TYPE_INTR_PBA_LEGACY, 0);
    if (!enic->legacy_pba && intr_mode == VNIC_DEV_INTR_MODE_INTX) {
        dev_err(enic_get_dev(enic),
            "Failed to hook legacy pba resource\n");
        err = -ENODEV;
        goto err_out_cleanup;
    }

    return 0;

err_out_cleanup:
    enic_free_vnic_resources(enic);

    return err;
}