Commit bdcf26bf authored by Bernard Metzler's avatar Bernard Metzler Committed by Jason Gunthorpe
Browse files

rdma/siw: network and RDMA core interface



Broken up commit to add the Soft iWarp RDMA driver.
Signed-off-by: default avatarBernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent a5319752
// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
/* Copyright (c) 2008-2019, IBM Corporation */
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <net/net_namespace.h>
#include <linux/rtnetlink.h>
#include <linux/if_arp.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/rdma_netlink.h>
#include <linux/kthread.h>
#include "siw.h"
#include "siw_verbs.h"
MODULE_AUTHOR("Bernard Metzler");
MODULE_DESCRIPTION("Software iWARP Driver");
MODULE_LICENSE("Dual BSD/GPL");
/* transmit from user buffer, if possible */
const bool zcopy_tx = true;
/* Restrict usage of GSO, if hardware peer iwarp is unable to process
* large packets. try_gso = true lets siw try to use local GSO,
* if peer agrees. Not using GSO severly limits siw maximum tx bandwidth.
*/
const bool try_gso;
/* Attach siw also with loopback devices */
const bool loopback_enabled = true;
/* We try to negotiate CRC on, if true */
const bool mpa_crc_required;
/* MPA CRC on/off enforced */
const bool mpa_crc_strict;
/* Control TCP_NODELAY socket option */
const bool siw_tcp_nagle;
/* Select MPA version to be used during connection setup */
u_char mpa_version = MPA_REVISION_2;
/* Selects MPA P2P mode (additional handshake during connection
* setup, if true.
*/
const bool peer_to_peer;
struct task_struct *siw_tx_thread[NR_CPUS];
struct crypto_shash *siw_crypto_shash;
static int siw_device_register(struct siw_device *sdev, const char *name)
{
struct ib_device *base_dev = &sdev->base_dev;
static int dev_id = 1;
int rv;
rv = ib_register_device(base_dev, name);
if (rv) {
pr_warn("siw: device registration error %d\n", rv);
return rv;
}
sdev->vendor_part_id = dev_id++;
siw_dbg(base_dev, "HWaddr=%pM\n", sdev->netdev->dev_addr);
return 0;
}
static void siw_device_cleanup(struct ib_device *base_dev)
{
struct siw_device *sdev = to_siw_dev(base_dev);
xa_destroy(&sdev->qp_xa);
xa_destroy(&sdev->mem_xa);
}
static int siw_create_tx_threads(void)
{
int cpu, rv, assigned = 0;
for_each_online_cpu(cpu) {
/* Skip HT cores */
if (cpu % cpumask_weight(topology_sibling_cpumask(cpu)))
continue;
siw_tx_thread[cpu] =
kthread_create(siw_run_sq, (unsigned long *)(long)cpu,
"siw_tx/%d", cpu);
if (IS_ERR(siw_tx_thread[cpu])) {
rv = PTR_ERR(siw_tx_thread[cpu]);
siw_tx_thread[cpu] = NULL;
pr_info("Creating TX thread for CPU %d failed", cpu);
continue;
}
kthread_bind(siw_tx_thread[cpu], cpu);
wake_up_process(siw_tx_thread[cpu]);
assigned++;
}
return assigned;
}
static int siw_dev_qualified(struct net_device *netdev)
{
/*
* Additional hardware support can be added here
* (e.g. ARPHRD_FDDI, ARPHRD_ATM, ...) - see
* <linux/if_arp.h> for type identifiers.
*/
if (netdev->type == ARPHRD_ETHER || netdev->type == ARPHRD_IEEE802 ||
(netdev->type == ARPHRD_LOOPBACK && loopback_enabled))
return 1;
return 0;
}
static DEFINE_PER_CPU(atomic_t, use_cnt = ATOMIC_INIT(0));
static struct {
struct cpumask **tx_valid_cpus;
int num_nodes;
} siw_cpu_info;
static int siw_init_cpulist(void)
{
int i, num_nodes = num_possible_nodes();
memset(siw_tx_thread, 0, sizeof(siw_tx_thread));
siw_cpu_info.num_nodes = num_nodes;
siw_cpu_info.tx_valid_cpus =
kcalloc(num_nodes, sizeof(struct cpumask *), GFP_KERNEL);
if (!siw_cpu_info.tx_valid_cpus) {
siw_cpu_info.num_nodes = 0;
return -ENOMEM;
}
for (i = 0; i < siw_cpu_info.num_nodes; i++) {
siw_cpu_info.tx_valid_cpus[i] =
kzalloc(sizeof(struct cpumask), GFP_KERNEL);
if (!siw_cpu_info.tx_valid_cpus[i])
goto out_err;
cpumask_clear(siw_cpu_info.tx_valid_cpus[i]);
}
for_each_possible_cpu(i)
cpumask_set_cpu(i, siw_cpu_info.tx_valid_cpus[cpu_to_node(i)]);
return 0;
out_err:
siw_cpu_info.num_nodes = 0;
while (i) {
kfree(siw_cpu_info.tx_valid_cpus[i]);
siw_cpu_info.tx_valid_cpus[i--] = NULL;
}
kfree(siw_cpu_info.tx_valid_cpus);
siw_cpu_info.tx_valid_cpus = NULL;
return -ENOMEM;
}
static void siw_destroy_cpulist(void)
{
int i = 0;
while (i < siw_cpu_info.num_nodes)
kfree(siw_cpu_info.tx_valid_cpus[i++]);
kfree(siw_cpu_info.tx_valid_cpus);
}
/*
* Choose CPU with least number of active QP's from NUMA node of
* TX interface.
*/
int siw_get_tx_cpu(struct siw_device *sdev)
{
const struct cpumask *tx_cpumask;
int i, num_cpus, cpu, min_use, node = sdev->numa_node, tx_cpu = -1;
if (node < 0)
tx_cpumask = cpu_online_mask;
else
tx_cpumask = siw_cpu_info.tx_valid_cpus[node];
num_cpus = cpumask_weight(tx_cpumask);
if (!num_cpus) {
/* no CPU on this NUMA node */
tx_cpumask = cpu_online_mask;
num_cpus = cpumask_weight(tx_cpumask);
}
if (!num_cpus)
goto out;
cpu = cpumask_first(tx_cpumask);
for (i = 0, min_use = SIW_MAX_QP; i < num_cpus;
i++, cpu = cpumask_next(cpu, tx_cpumask)) {
int usage;
/* Skip any cores which have no TX thread */
if (!siw_tx_thread[cpu])
continue;
usage = atomic_read(&per_cpu(use_cnt, cpu));
if (usage <= min_use) {
tx_cpu = cpu;
min_use = usage;
}
}
siw_dbg(&sdev->base_dev,
"tx cpu %d, node %d, %d qp's\n", tx_cpu, node, min_use);
out:
if (tx_cpu >= 0)
atomic_inc(&per_cpu(use_cnt, tx_cpu));
else
pr_warn("siw: no tx cpu found\n");
return tx_cpu;
}
void siw_put_tx_cpu(int cpu)
{
atomic_dec(&per_cpu(use_cnt, cpu));
}
static struct ib_qp *siw_get_base_qp(struct ib_device *base_dev, int id)
{
struct siw_qp *qp = siw_qp_id2obj(to_siw_dev(base_dev), id);
if (qp) {
/*
* siw_qp_id2obj() increments object reference count
*/
siw_qp_put(qp);
return qp->ib_qp;
}
return NULL;
}
static void siw_verbs_sq_flush(struct ib_qp *base_qp)
{
struct siw_qp *qp = to_siw_qp(base_qp);
down_write(&qp->state_lock);
siw_sq_flush(qp);
up_write(&qp->state_lock);
}
static void siw_verbs_rq_flush(struct ib_qp *base_qp)
{
struct siw_qp *qp = to_siw_qp(base_qp);
down_write(&qp->state_lock);
siw_rq_flush(qp);
up_write(&qp->state_lock);
}
static const struct ib_device_ops siw_device_ops = {
.owner = THIS_MODULE,
.uverbs_abi_ver = SIW_ABI_VERSION,
.driver_id = RDMA_DRIVER_SIW,
.alloc_mr = siw_alloc_mr,
.alloc_pd = siw_alloc_pd,
.alloc_ucontext = siw_alloc_ucontext,
.create_cq = siw_create_cq,
.create_qp = siw_create_qp,
.create_srq = siw_create_srq,
.dealloc_driver = siw_device_cleanup,
.dealloc_pd = siw_dealloc_pd,
.dealloc_ucontext = siw_dealloc_ucontext,
.dereg_mr = siw_dereg_mr,
.destroy_cq = siw_destroy_cq,
.destroy_qp = siw_destroy_qp,
.destroy_srq = siw_destroy_srq,
.drain_rq = siw_verbs_rq_flush,
.drain_sq = siw_verbs_sq_flush,
.get_dma_mr = siw_get_dma_mr,
.get_port_immutable = siw_get_port_immutable,
.iw_accept = siw_accept,
.iw_add_ref = siw_qp_get_ref,
.iw_connect = siw_connect,
.iw_create_listen = siw_create_listen,
.iw_destroy_listen = siw_destroy_listen,
.iw_get_qp = siw_get_base_qp,
.iw_reject = siw_reject,
.iw_rem_ref = siw_qp_put_ref,
.map_mr_sg = siw_map_mr_sg,
.mmap = siw_mmap,
.modify_qp = siw_verbs_modify_qp,
.modify_srq = siw_modify_srq,
.poll_cq = siw_poll_cq,
.post_recv = siw_post_receive,
.post_send = siw_post_send,
.post_srq_recv = siw_post_srq_recv,
.query_device = siw_query_device,
.query_gid = siw_query_gid,
.query_pkey = siw_query_pkey,
.query_port = siw_query_port,
.query_qp = siw_query_qp,
.query_srq = siw_query_srq,
.req_notify_cq = siw_req_notify_cq,
.reg_user_mr = siw_reg_user_mr,
INIT_RDMA_OBJ_SIZE(ib_cq, siw_cq, base_cq),
INIT_RDMA_OBJ_SIZE(ib_pd, siw_pd, base_pd),
INIT_RDMA_OBJ_SIZE(ib_srq, siw_srq, base_srq),
INIT_RDMA_OBJ_SIZE(ib_ucontext, siw_ucontext, base_ucontext),
};
static struct siw_device *siw_device_create(struct net_device *netdev)
{
struct siw_device *sdev = NULL;
struct ib_device *base_dev;
struct device *parent = netdev->dev.parent;
int rv;
if (!parent) {
/*
* The loopback device has no parent device,
* so it appears as a top-level device. To support
* loopback device connectivity, take this device
* as the parent device. Skip all other devices
* w/o parent device.
*/
if (netdev->type != ARPHRD_LOOPBACK) {
pr_warn("siw: device %s error: no parent device\n",
netdev->name);
return NULL;
}
parent = &netdev->dev;
}
sdev = ib_alloc_device(siw_device, base_dev);
if (!sdev)
return NULL;
base_dev = &sdev->base_dev;
sdev->netdev = netdev;
if (netdev->type != ARPHRD_LOOPBACK) {
memcpy(&base_dev->node_guid, netdev->dev_addr, 6);
} else {
/*
* The loopback device does not have a HW address,
* but connection mangagement lib expects gid != 0
*/
size_t gidlen = min_t(size_t, strlen(base_dev->name), 6);
memcpy(&base_dev->node_guid, base_dev->name, gidlen);
}
base_dev->uverbs_cmd_mask =
(1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
(1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
(1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
(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_POLL_CQ) |
(1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) |
(1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
(1ull << IB_USER_VERBS_CMD_CREATE_QP) |
(1ull << IB_USER_VERBS_CMD_QUERY_QP) |
(1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
(1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
(1ull << IB_USER_VERBS_CMD_POST_SEND) |
(1ull << IB_USER_VERBS_CMD_POST_RECV) |
(1ull << IB_USER_VERBS_CMD_CREATE_SRQ) |
(1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV) |
(1ull << IB_USER_VERBS_CMD_MODIFY_SRQ) |
(1ull << IB_USER_VERBS_CMD_QUERY_SRQ) |
(1ull << IB_USER_VERBS_CMD_DESTROY_SRQ);
base_dev->node_type = RDMA_NODE_RNIC;
memcpy(base_dev->node_desc, SIW_NODE_DESC_COMMON,
sizeof(SIW_NODE_DESC_COMMON));
/*
* Current model (one-to-one device association):
* One Softiwarp device per net_device or, equivalently,
* per physical port.
*/
base_dev->phys_port_cnt = 1;
base_dev->dev.parent = parent;
base_dev->dev.dma_ops = &dma_virt_ops;
base_dev->num_comp_vectors = num_possible_cpus();
ib_set_device_ops(base_dev, &siw_device_ops);
rv = ib_device_set_netdev(base_dev, netdev, 1);
if (rv)
goto error;
memcpy(base_dev->iw_ifname, netdev->name,
sizeof(base_dev->iw_ifname));
/* Disable TCP port mapping */
base_dev->iw_driver_flags = IW_F_NO_PORT_MAP,
sdev->attrs.max_qp = SIW_MAX_QP;
sdev->attrs.max_qp_wr = SIW_MAX_QP_WR;
sdev->attrs.max_ord = SIW_MAX_ORD_QP;
sdev->attrs.max_ird = SIW_MAX_IRD_QP;
sdev->attrs.max_sge = SIW_MAX_SGE;
sdev->attrs.max_sge_rd = SIW_MAX_SGE_RD;
sdev->attrs.max_cq = SIW_MAX_CQ;
sdev->attrs.max_cqe = SIW_MAX_CQE;
sdev->attrs.max_mr = SIW_MAX_MR;
sdev->attrs.max_pd = SIW_MAX_PD;
sdev->attrs.max_mw = SIW_MAX_MW;
sdev->attrs.max_fmr = SIW_MAX_FMR;
sdev->attrs.max_srq = SIW_MAX_SRQ;
sdev->attrs.max_srq_wr = SIW_MAX_SRQ_WR;
sdev->attrs.max_srq_sge = SIW_MAX_SGE;
xa_init_flags(&sdev->qp_xa, XA_FLAGS_ALLOC1);
xa_init_flags(&sdev->mem_xa, XA_FLAGS_ALLOC1);
INIT_LIST_HEAD(&sdev->cep_list);
INIT_LIST_HEAD(&sdev->qp_list);
atomic_set(&sdev->num_ctx, 0);
atomic_set(&sdev->num_srq, 0);
atomic_set(&sdev->num_qp, 0);
atomic_set(&sdev->num_cq, 0);
atomic_set(&sdev->num_mr, 0);
atomic_set(&sdev->num_pd, 0);
sdev->numa_node = dev_to_node(parent);
spin_lock_init(&sdev->lock);
return sdev;
error:
ib_dealloc_device(base_dev);
return NULL;
}
/*
* Network link becomes unavailable. Mark all
* affected QP's accordingly.
*/
static void siw_netdev_down(struct work_struct *work)
{
struct siw_device *sdev =
container_of(work, struct siw_device, netdev_down);
struct siw_qp_attrs qp_attrs;
struct list_head *pos, *tmp;
memset(&qp_attrs, 0, sizeof(qp_attrs));
qp_attrs.state = SIW_QP_STATE_ERROR;
list_for_each_safe(pos, tmp, &sdev->qp_list) {
struct siw_qp *qp = list_entry(pos, struct siw_qp, devq);
down_write(&qp->state_lock);
WARN_ON(siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE));
up_write(&qp->state_lock);
}
ib_device_put(&sdev->base_dev);
}
static void siw_device_goes_down(struct siw_device *sdev)
{
if (ib_device_try_get(&sdev->base_dev)) {
INIT_WORK(&sdev->netdev_down, siw_netdev_down);
schedule_work(&sdev->netdev_down);
}
}
static int siw_netdev_event(struct notifier_block *nb, unsigned long event,
void *arg)
{
struct net_device *netdev = netdev_notifier_info_to_dev(arg);
struct ib_device *base_dev;
struct siw_device *sdev;
dev_dbg(&netdev->dev, "siw: event %lu\n", event);
if (dev_net(netdev) != &init_net)
return NOTIFY_OK;
base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW);
if (!base_dev)
return NOTIFY_OK;
sdev = to_siw_dev(base_dev);
switch (event) {
case NETDEV_UP:
sdev->state = IB_PORT_ACTIVE;
siw_port_event(sdev, 1, IB_EVENT_PORT_ACTIVE);
break;
case NETDEV_GOING_DOWN:
siw_device_goes_down(sdev);
break;
case NETDEV_DOWN:
sdev->state = IB_PORT_DOWN;
siw_port_event(sdev, 1, IB_EVENT_PORT_ERR);
break;
case NETDEV_REGISTER:
/*
* Device registration now handled only by
* rdma netlink commands. So it shall be impossible
* to end up here with a valid siw device.
*/
siw_dbg(base_dev, "unexpected NETDEV_REGISTER event\n");
break;
case NETDEV_UNREGISTER:
ib_unregister_device_queued(&sdev->base_dev);
break;
case NETDEV_CHANGEADDR:
siw_port_event(sdev, 1, IB_EVENT_LID_CHANGE);
break;
/*
* Todo: Below netdev events are currently not handled.
*/
case NETDEV_CHANGEMTU:
case NETDEV_CHANGE:
break;
default:
break;
}
ib_device_put(&sdev->base_dev);
return NOTIFY_OK;
}
static struct notifier_block siw_netdev_nb = {
.notifier_call = siw_netdev_event,
};
static int siw_newlink(const char *basedev_name, struct net_device *netdev)
{
struct ib_device *base_dev;
struct siw_device *sdev = NULL;
int rv = -ENOMEM;
if (!siw_dev_qualified(netdev))
return -EINVAL;
base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW);
if (base_dev) {
ib_device_put(base_dev);
return -EEXIST;
}
sdev = siw_device_create(netdev);
if (sdev) {
dev_dbg(&netdev->dev, "siw: new device\n");
if (netif_running(netdev) && netif_carrier_ok(netdev))
sdev->state = IB_PORT_ACTIVE;
else
sdev->state = IB_PORT_DOWN;
rv = siw_device_register(sdev, basedev_name);
if (rv)
ib_dealloc_device(&sdev->base_dev);
}
return rv;
}
static struct rdma_link_ops siw_link_ops = {
.type = "siw",
.newlink = siw_newlink,
};
/*
* siw_init_module - Initialize Softiwarp module and register with netdev
* subsystem.
*/
static __init int siw_init_module(void)
{
int rv;
int nr_cpu;
if (SENDPAGE_THRESH < SIW_MAX_INLINE) {
pr_info("siw: sendpage threshold too small: %u\n",
(int)SENDPAGE_THRESH);
rv = -EINVAL;
goto out_error;
}
rv = siw_init_cpulist();
if (rv)
goto out_error;
rv = siw_cm_init();
if (rv)
goto out_error;
if (!siw_create_tx_threads()) {
pr_info("siw: Could not start any TX thread\n");
goto out_error;
}
/*