provider.c

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/*
 * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * 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/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/rtnetlink.h>
#include <linux/inetdevice.h>
#include <linux/io.h>

#include <asm/irq.h>
#include <asm/byteorder.h>

#include <rdma/iw_cm.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_smi.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_user_verbs.h>

#include "iw_cxgb4.h"

static int fastreg_support = 1;
module_param(fastreg_support, int, 0644);
MODULE_PARM_DESC(fastreg_support, "Advertise fastreg support (default=1)");

static struct ib_ah *c4iw_ah_create(struct ib_pd *pd,
                    struct ib_ah_attr *ah_attr)
{
    return ERR_PTR(-ENOSYS);
}

static int c4iw_ah_destroy(struct ib_ah *ah)
{
    return -ENOSYS;
}

static int c4iw_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
{
    return -ENOSYS;
}

static int c4iw_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
{
    return -ENOSYS;
}

static int c4iw_process_mad(struct ib_device *ibdev, int mad_flags,
                u8 port_num, struct ib_wc *in_wc,
                struct ib_grh *in_grh, struct ib_mad *in_mad,
                struct ib_mad *out_mad)
{
    return -ENOSYS;
}

static int c4iw_dealloc_ucontext(struct ib_ucontext *context)
{
    struct c4iw_dev *rhp = to_c4iw_dev(context->device);
    struct c4iw_ucontext *ucontext = to_c4iw_ucontext(context);
    struct c4iw_mm_entry *mm, *tmp;

    PDBG("%s context %p\n", __func__, context);
    list_for_each_entry_safe(mm, tmp, &ucontext->mmaps, entry)
        kfree(mm);
    c4iw_release_dev_ucontext(&rhp->rdev, &ucontext->uctx);
    kfree(ucontext);
    return 0;
}

static struct ib_ucontext *c4iw_alloc_ucontext(struct ib_device *ibdev,
                           struct ib_udata *udata)
{
    struct c4iw_ucontext *context;
    struct c4iw_dev *rhp = to_c4iw_dev(ibdev);

    PDBG("%s ibdev %p\n", __func__, ibdev);
    context = kzalloc(sizeof(*context), GFP_KERNEL);
    if (!context)
        return ERR_PTR(-ENOMEM);
    c4iw_init_dev_ucontext(&rhp->rdev, &context->uctx);
    INIT_LIST_HEAD(&context->mmaps);
    spin_lock_init(&context->mmap_lock);
    return &context->ibucontext;
}

static int c4iw_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
{
    int len = vma->vm_end - vma->vm_start;
    u32 key = vma->vm_pgoff << PAGE_SHIFT;
    struct c4iw_rdev *rdev;
    int ret = 0;
    struct c4iw_mm_entry *mm;
    struct c4iw_ucontext *ucontext;
    u64 addr;

    PDBG("%s pgoff 0x%lx key 0x%x len %d\n", __func__, vma->vm_pgoff,
         key, len);

    if (vma->vm_start & (PAGE_SIZE-1))
        return -EINVAL;

    rdev = &(to_c4iw_dev(context->device)->rdev);
    ucontext = to_c4iw_ucontext(context);

    mm = remove_mmap(ucontext, key, len);
    if (!mm)
        return -EINVAL;
    addr = mm->addr;
    kfree(mm);

    if ((addr >= pci_resource_start(rdev->lldi.pdev, 0)) &&
        (addr < (pci_resource_start(rdev->lldi.pdev, 0) +
            pci_resource_len(rdev->lldi.pdev, 0)))) {

        /*
         * MA_SYNC register...
         */
        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
        ret = io_remap_pfn_range(vma, vma->vm_start,
                     addr >> PAGE_SHIFT,
                     len, vma->vm_page_prot);
    } else if ((addr >= pci_resource_start(rdev->lldi.pdev, 2)) &&
           (addr < (pci_resource_start(rdev->lldi.pdev, 2) +
            pci_resource_len(rdev->lldi.pdev, 2)))) {

        /*
         * Map user DB or OCQP memory...
         */
        if (addr >= rdev->oc_mw_pa)
            vma->vm_page_prot = t4_pgprot_wc(vma->vm_page_prot);
        else
            vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
        ret = io_remap_pfn_range(vma, vma->vm_start,
                     addr >> PAGE_SHIFT,
                     len, vma->vm_page_prot);
    } else {

        /*
         * Map WQ or CQ contig dma memory...
         */
        ret = remap_pfn_range(vma, vma->vm_start,
                      addr >> PAGE_SHIFT,
                      len, vma->vm_page_prot);
    }

    return ret;
}

static int c4iw_deallocate_pd(struct ib_pd *pd)
{
    struct c4iw_dev *rhp;
    struct c4iw_pd *php;

    php = to_c4iw_pd(pd);
    rhp = php->rhp;
    PDBG("%s ibpd %p pdid 0x%x\n", __func__, pd, php->pdid);
    c4iw_put_resource(&rhp->rdev.resource.pdid_table, php->pdid);
    mutex_lock(&rhp->rdev.stats.lock);
    rhp->rdev.stats.pd.cur--;
    mutex_unlock(&rhp->rdev.stats.lock);
    kfree(php);
    return 0;
}

static struct ib_pd *c4iw_allocate_pd(struct ib_device *ibdev,
                      struct ib_ucontext *context,
                      struct ib_udata *udata)
{
    struct c4iw_pd *php;
    u32 pdid;
    struct c4iw_dev *rhp;

    PDBG("%s ibdev %p\n", __func__, ibdev);
    rhp = (struct c4iw_dev *) ibdev;
    pdid =  c4iw_get_resource(&rhp->rdev.resource.pdid_table);
    if (!pdid)
        return ERR_PTR(-EINVAL);
    php = kzalloc(sizeof(*php), GFP_KERNEL);
    if (!php) {
        c4iw_put_resource(&rhp->rdev.resource.pdid_table, pdid);
        return ERR_PTR(-ENOMEM);
    }
    php->pdid = pdid;
    php->rhp = rhp;
    if (context) {
        if (ib_copy_to_udata(udata, &php->pdid, sizeof(u32))) {
            c4iw_deallocate_pd(&php->ibpd);
            return ERR_PTR(-EFAULT);
        }
    }
    mutex_lock(&rhp->rdev.stats.lock);
    rhp->rdev.stats.pd.cur++;
    if (rhp->rdev.stats.pd.cur > rhp->rdev.stats.pd.max)
        rhp->rdev.stats.pd.max = rhp->rdev.stats.pd.cur;
    mutex_unlock(&rhp->rdev.stats.lock);
    PDBG("%s pdid 0x%0x ptr 0x%p\n", __func__, pdid, php);
    return &php->ibpd;
}

static int c4iw_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
               u16 *pkey)
{
    PDBG("%s ibdev %p\n", __func__, ibdev);
    *pkey = 0;
    return 0;
}

static int c4iw_query_gid(struct ib_device *ibdev, u8 port, int index,
              union ib_gid *gid)
{
    struct c4iw_dev *dev;

    PDBG("%s ibdev %p, port %d, index %d, gid %p\n",
           __func__, ibdev, port, index, gid);
    dev = to_c4iw_dev(ibdev);
    BUG_ON(port == 0);
    memset(&(gid->raw[0]), 0, sizeof(gid->raw));
    memcpy(&(gid->raw[0]), dev->rdev.lldi.ports[port-1]->dev_addr, 6);
    return 0;
}

static int c4iw_query_device(struct ib_device *ibdev,
                 struct ib_device_attr *props)
{

    struct c4iw_dev *dev;
    PDBG("%s ibdev %p\n", __func__, ibdev);

    dev = to_c4iw_dev(ibdev);
    memset(props, 0, sizeof *props);
    memcpy(&props->sys_image_guid, dev->rdev.lldi.ports[0]->dev_addr, 6);
    props->hw_ver = dev->rdev.lldi.adapter_type;
    props->fw_ver = dev->rdev.lldi.fw_vers;
    props->device_cap_flags = dev->device_cap_flags;
    props->page_size_cap = T4_PAGESIZE_MASK;
    props->vendor_id = (u32)dev->rdev.lldi.pdev->vendor;
    props->vendor_part_id = (u32)dev->rdev.lldi.pdev->device;
    props->max_mr_size = T4_MAX_MR_SIZE;
    props->max_qp = T4_MAX_NUM_QP;
    props->max_qp_wr = T4_MAX_QP_DEPTH;
    props->max_sge = T4_MAX_RECV_SGE;
    props->max_sge_rd = 1;
    props->max_qp_rd_atom = c4iw_max_read_depth;
    props->max_qp_init_rd_atom = c4iw_max_read_depth;
    props->max_cq = T4_MAX_NUM_CQ;
    props->max_cqe = T4_MAX_CQ_DEPTH;
    props->max_mr = c4iw_num_stags(&dev->rdev);
    props->max_pd = T4_MAX_NUM_PD;
    props->local_ca_ack_delay = 0;
    props->max_fast_reg_page_list_len = T4_MAX_FR_DEPTH;

    return 0;
}

static int c4iw_query_port(struct ib_device *ibdev, u8 port,
               struct ib_port_attr *props)
{
    struct c4iw_dev *dev;
    struct net_device *netdev;
    struct in_device *inetdev;

    PDBG("%s ibdev %p\n", __func__, ibdev);

    dev = to_c4iw_dev(ibdev);
    netdev = dev->rdev.lldi.ports[port-1];

    memset(props, 0, sizeof(struct ib_port_attr));
    props->max_mtu = IB_MTU_4096;
    if (netdev->mtu >= 4096)
        props->active_mtu = IB_MTU_4096;
    else if (netdev->mtu >= 2048)
        props->active_mtu = IB_MTU_2048;
    else if (netdev->mtu >= 1024)
        props->active_mtu = IB_MTU_1024;
    else if (netdev->mtu >= 512)
        props->active_mtu = IB_MTU_512;
    else
        props->active_mtu = IB_MTU_256;

    if (!netif_carrier_ok(netdev))
        props->state = IB_PORT_DOWN;
    else {
        inetdev = in_dev_get(netdev);
        if (inetdev) {
            if (inetdev->ifa_list)
                props->state = IB_PORT_ACTIVE;
            else
                props->state = IB_PORT_INIT;
            in_dev_put(inetdev);
        } else
            props->state = IB_PORT_INIT;
    }

    props->port_cap_flags =
        IB_PORT_CM_SUP |
        IB_PORT_SNMP_TUNNEL_SUP |
        IB_PORT_REINIT_SUP |
        IB_PORT_DEVICE_MGMT_SUP |
        IB_PORT_VENDOR_CLASS_SUP | IB_PORT_BOOT_MGMT_SUP;
    props->gid_tbl_len = 1;
    props->pkey_tbl_len = 1;
    props->active_width = 2;
    props->active_speed = IB_SPEED_DDR;
    props->max_msg_sz = -1;

    return 0;
}

static ssize_t show_rev(struct device *dev, struct device_attribute *attr,
            char *buf)
{
    struct c4iw_dev *c4iw_dev = container_of(dev, struct c4iw_dev,
                         ibdev.dev);
    PDBG("%s dev 0x%p\n", __func__, dev);
    return sprintf(buf, "%d\n", c4iw_dev->rdev.lldi.adapter_type);
}

static ssize_t show_fw_ver(struct device *dev, struct device_attribute *attr,
               char *buf)
{
    struct c4iw_dev *c4iw_dev = container_of(dev, struct c4iw_dev,
                         ibdev.dev);
    PDBG("%s dev 0x%p\n", __func__, dev);

    return sprintf(buf, "%u.%u.%u.%u\n",
            FW_HDR_FW_VER_MAJOR_GET(c4iw_dev->rdev.lldi.fw_vers),
            FW_HDR_FW_VER_MINOR_GET(c4iw_dev->rdev.lldi.fw_vers),
            FW_HDR_FW_VER_MICRO_GET(c4iw_dev->rdev.lldi.fw_vers),
            FW_HDR_FW_VER_BUILD_GET(c4iw_dev->rdev.lldi.fw_vers));
}

static ssize_t show_hca(struct device *dev, struct device_attribute *attr,
            char *buf)
{
    struct c4iw_dev *c4iw_dev = container_of(dev, struct c4iw_dev,
                         ibdev.dev);
    struct ethtool_drvinfo info;
    struct net_device *lldev = c4iw_dev->rdev.lldi.ports[0];

    PDBG("%s dev 0x%p\n", __func__, dev);
    lldev->ethtool_ops->get_drvinfo(lldev, &info);
    return sprintf(buf, "%s\n", info.driver);
}

static ssize_t show_board(struct device *dev, struct device_attribute *attr,
              char *buf)
{
    struct c4iw_dev *c4iw_dev = container_of(dev, struct c4iw_dev,
                         ibdev.dev);
    PDBG("%s dev 0x%p\n", __func__, dev);
    return sprintf(buf, "%x.%x\n", c4iw_dev->rdev.lldi.pdev->vendor,
               c4iw_dev->rdev.lldi.pdev->device);
}

static int c4iw_get_mib(struct ib_device *ibdev,
            union rdma_protocol_stats *stats)
{
    struct tp_tcp_stats v4, v6;
    struct c4iw_dev *c4iw_dev = to_c4iw_dev(ibdev);

    cxgb4_get_tcp_stats(c4iw_dev->rdev.lldi.pdev, &v4, &v6);
    memset(stats, 0, sizeof *stats);
    stats->iw.tcpInSegs = v4.tcpInSegs + v6.tcpInSegs;
    stats->iw.tcpOutSegs = v4.tcpOutSegs + v6.tcpOutSegs;
    stats->iw.tcpRetransSegs = v4.tcpRetransSegs + v6.tcpRetransSegs;
    stats->iw.tcpOutRsts = v4.tcpOutRsts + v6.tcpOutSegs;

    return 0;
}

static DEVICE_ATTR(hw_rev, S_IRUGO, show_rev, NULL);
static DEVICE_ATTR(fw_ver, S_IRUGO, show_fw_ver, NULL);
static DEVICE_ATTR(hca_type, S_IRUGO, show_hca, NULL);
static DEVICE_ATTR(board_id, S_IRUGO, show_board, NULL);

static struct device_attribute *c4iw_class_attributes[] = {
    &dev_attr_hw_rev,
    &dev_attr_fw_ver,
    &dev_attr_hca_type,
    &dev_attr_board_id,
};

int c4iw_register_device(struct c4iw_dev *dev)
{
    int ret;
    int i;

    PDBG("%s c4iw_dev %p\n", __func__, dev);
    BUG_ON(!dev->rdev.lldi.ports[0]);
    strlcpy(dev->ibdev.name, "cxgb4_%d", IB_DEVICE_NAME_MAX);
    memset(&dev->ibdev.node_guid, 0, sizeof(dev->ibdev.node_guid));
    memcpy(&dev->ibdev.node_guid, dev->rdev.lldi.ports[0]->dev_addr, 6);
    dev->ibdev.owner = THIS_MODULE;
    dev->device_cap_flags = IB_DEVICE_LOCAL_DMA_LKEY | IB_DEVICE_MEM_WINDOW;
    if (fastreg_support)
        dev->device_cap_flags |= IB_DEVICE_MEM_MGT_EXTENSIONS;
    dev->ibdev.local_dma_lkey = 0;
    dev->ibdev.uverbs_cmd_mask =
        (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
        (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
        (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
        (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
        (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
        (1ull << IB_USER_VERBS_CMD_REG_MR) |
        (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
        (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
        (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
        (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
        (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) |
        (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
        (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
        (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
        (1ull << IB_USER_VERBS_CMD_POLL_CQ) |
        (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
        (1ull << IB_USER_VERBS_CMD_POST_SEND) |
        (1ull << IB_USER_VERBS_CMD_POST_RECV);
    dev->ibdev.node_type = RDMA_NODE_RNIC;
    memcpy(dev->ibdev.node_desc, C4IW_NODE_DESC, sizeof(C4IW_NODE_DESC));
    dev->ibdev.phys_port_cnt = dev->rdev.lldi.nports;
    dev->ibdev.num_comp_vectors = 1;
    dev->ibdev.dma_device = &(dev->rdev.lldi.pdev->dev);
    dev->ibdev.query_device = c4iw_query_device;
    dev->ibdev.query_port = c4iw_query_port;
    dev->ibdev.query_pkey = c4iw_query_pkey;
    dev->ibdev.query_gid = c4iw_query_gid;
    dev->ibdev.alloc_ucontext = c4iw_alloc_ucontext;
    dev->ibdev.dealloc_ucontext = c4iw_dealloc_ucontext;
    dev->ibdev.mmap = c4iw_mmap;
    dev->ibdev.alloc_pd = c4iw_allocate_pd;
    dev->ibdev.dealloc_pd = c4iw_deallocate_pd;
    dev->ibdev.create_ah = c4iw_ah_create;
    dev->ibdev.destroy_ah = c4iw_ah_destroy;
    dev->ibdev.create_qp = c4iw_create_qp;
    dev->ibdev.modify_qp = c4iw_ib_modify_qp;
    dev->ibdev.query_qp = c4iw_ib_query_qp;
    dev->ibdev.destroy_qp = c4iw_destroy_qp;
    dev->ibdev.create_cq = c4iw_create_cq;
    dev->ibdev.destroy_cq = c4iw_destroy_cq;
    dev->ibdev.resize_cq = c4iw_resize_cq;
    dev->ibdev.poll_cq = c4iw_poll_cq;
    dev->ibdev.get_dma_mr = c4iw_get_dma_mr;
    dev->ibdev.reg_phys_mr = c4iw_register_phys_mem;
    dev->ibdev.rereg_phys_mr = c4iw_reregister_phys_mem;
    dev->ibdev.reg_user_mr = c4iw_reg_user_mr;
    dev->ibdev.dereg_mr = c4iw_dereg_mr;
    dev->ibdev.alloc_mw = c4iw_alloc_mw;
    dev->ibdev.bind_mw = c4iw_bind_mw;
    dev->ibdev.dealloc_mw = c4iw_dealloc_mw;
    dev->ibdev.alloc_fast_reg_mr = c4iw_alloc_fast_reg_mr;
    dev->ibdev.alloc_fast_reg_page_list = c4iw_alloc_fastreg_pbl;
    dev->ibdev.free_fast_reg_page_list = c4iw_free_fastreg_pbl;
    dev->ibdev.attach_mcast = c4iw_multicast_attach;
    dev->ibdev.detach_mcast = c4iw_multicast_detach;
    dev->ibdev.process_mad = c4iw_process_mad;
    dev->ibdev.req_notify_cq = c4iw_arm_cq;
    dev->ibdev.post_send = c4iw_post_send;
    dev->ibdev.post_recv = c4iw_post_receive;
    dev->ibdev.get_protocol_stats = c4iw_get_mib;
    dev->ibdev.uverbs_abi_ver = C4IW_UVERBS_ABI_VERSION;

    dev->ibdev.iwcm = kmalloc(sizeof(struct iw_cm_verbs), GFP_KERNEL);
    if (!dev->ibdev.iwcm)
        return -ENOMEM;

    dev->ibdev.iwcm->connect = c4iw_connect;
    dev->ibdev.iwcm->accept = c4iw_accept_cr;
    dev->ibdev.iwcm->reject = c4iw_reject_cr;
    dev->ibdev.iwcm->create_listen = c4iw_create_listen;
    dev->ibdev.iwcm->destroy_listen = c4iw_destroy_listen;
    dev->ibdev.iwcm->add_ref = c4iw_qp_add_ref;
    dev->ibdev.iwcm->rem_ref = c4iw_qp_rem_ref;
    dev->ibdev.iwcm->get_qp = c4iw_get_qp;

    ret = ib_register_device(&dev->ibdev, NULL);
    if (ret)
        goto bail1;

    for (i = 0; i < ARRAY_SIZE(c4iw_class_attributes); ++i) {
        ret = device_create_file(&dev->ibdev.dev,
                     c4iw_class_attributes[i]);
        if (ret)
            goto bail2;
    }
    return 0;
bail2:
    ib_unregister_device(&dev->ibdev);
bail1:
    kfree(dev->ibdev.iwcm);
    return ret;
}

void c4iw_unregister_device(struct c4iw_dev *dev)
{
    int i;

    PDBG("%s c4iw_dev %p\n", __func__, dev);
    for (i = 0; i < ARRAY_SIZE(c4iw_class_attributes); ++i)
        device_remove_file(&dev->ibdev.dev,
                   c4iw_class_attributes[i]);
    ib_unregister_device(&dev->ibdev);
    kfree(dev->ibdev.iwcm);
    return;
}