// SPDX-License-Identifier: GPL-2.0
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* IB infrastructure:
* Establish SMC-R as an Infiniband Client to be notified about added and
* removed IB devices of type RDMA.
* Determine device and port characteristics for these IB devices.
*
* Copyright IBM Corp. 2016
*
* Author(s): Ursula Braun <[email protected]>
*/
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
#include <linux/random.h>
#include <linux/workqueue.h>
#include <linux/scatterlist.h>
#include <linux/wait.h>
#include <linux/mutex.h>
#include <linux/inetdevice.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_cache.h>
#include "smc_pnet.h"
#include "smc_ib.h"
#include "smc_core.h"
#include "smc_wr.h"
#include "smc.h"
#include "smc_netlink.h"
#define SMC_MAX_CQE 32766 /* max. # of completion queue elements */
#define SMC_QP_MIN_RNR_TIMER 5
#define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */
#define SMC_QP_RETRY_CNT 7 /* 7: infinite */
#define SMC_QP_RNR_RETRY 7 /* 7: infinite */
struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */
.mutex = __MUTEX_INITIALIZER(smc_ib_devices.mutex),
.list = LIST_HEAD_INIT(smc_ib_devices.list),
};
u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */
static int smc_ib_modify_qp_init(struct smc_link *lnk)
{
struct ib_qp_attr qp_attr;
memset(&qp_attr, 0, sizeof(qp_attr));
qp_attr.qp_state = IB_QPS_INIT;
qp_attr.pkey_index = 0;
qp_attr.port_num = lnk->ibport;
qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE
| IB_ACCESS_REMOTE_WRITE;
return ib_modify_qp(lnk->roce_qp, &qp_attr,
IB_QP_STATE | IB_QP_PKEY_INDEX |
IB_QP_ACCESS_FLAGS | IB_QP_PORT);
}
static int smc_ib_modify_qp_rtr(struct smc_link *lnk)
{
enum ib_qp_attr_mask qp_attr_mask =
IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN |
IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
struct ib_qp_attr qp_attr;
u8 hop_lim = 1;
memset(&qp_attr, 0, sizeof(qp_attr));
qp_attr.qp_state = IB_QPS_RTR;
qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu);
qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE;
rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport);
if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway)
hop_lim = IPV6_DEFAULT_HOPLIMIT;
rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, hop_lim, 0);
rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid);
if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway)
memcpy(&qp_attr.ah_attr.roce.dmac, lnk->lgr->nexthop_mac,
sizeof(lnk->lgr->nexthop_mac));
else
memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac,
sizeof(lnk->peer_mac));
qp_attr.dest_qp_num = lnk->peer_qpn;
qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */
qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming
* requests
*/
qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER;
return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask);
}
int smc_ib_modify_qp_rts(struct smc_link *lnk)
{
struct ib_qp_attr qp_attr;
memset(&qp_attr, 0, sizeof(qp_attr));
qp_attr.qp_state = IB_QPS_RTS;
qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */
qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */
qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */
qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */
qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and
* atomic ops allowed
*/
return ib_modify_qp(lnk->roce_qp, &qp_attr,
IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
IB_QP_SQ_PSN | IB_QP_RNR_RETRY |
IB_QP_MAX_QP_RD_ATOMIC);
}
int smc_ib_modify_qp_error(struct smc_link *lnk)
{
struct ib_qp_attr qp_attr;
memset(&qp_attr, 0, sizeof(qp_attr));
qp_attr.qp_state = IB_QPS_ERR;
return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE);
}
int smc_ib_ready_link(struct smc_link *lnk)
{
struct smc_link_group *lgr = smc_get_lgr(lnk);
int rc = 0;
rc = smc_ib_modify_qp_init(lnk);
if (rc)
goto out;
rc = smc_ib_modify_qp_rtr(lnk);
if (rc)
goto out;
smc_wr_remember_qp_attr(lnk);
rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv,
IB_CQ_SOLICITED_MASK);
if (rc)
goto out;
rc = smc_wr_rx_post_init(lnk);
if (rc)
goto out;
smc_wr_remember_qp_attr(lnk);
if (lgr->role == SMC_SERV) {
rc = smc_ib_modify_qp_rts(lnk);
if (rc)
goto out;
smc_wr_remember_qp_attr(lnk);
}
out:
return rc;
}
static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport)
{
const struct ib_gid_attr *attr;
int rc;
attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0);
if (IS_ERR(attr))
return -ENODEV;
rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]);
rdma_put_gid_attr(attr);
return rc;
}
/* Create an identifier unique for this instance of SMC-R.
* The MAC-address of the first active registered IB device
* plus a random 2-byte number is used to create this identifier.
* This name is delivered to the peer during connection initialization.
*/
static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev,
u8 ibport)
{
memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1],
sizeof(smcibdev->mac[ibport - 1]));
}
bool smc_ib_is_valid_local_systemid(void)
{
return !is_zero_ether_addr(&local_systemid[2]);
}
static void smc_ib_init_local_systemid(void)
{
get_random_bytes(&local_systemid[0], 2);
}
bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)
{
return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE;
}
int smc_ib_find_route(struct net *net, __be32 saddr, __be32 daddr,
u8 nexthop_mac[], u8 *uses_gateway)
{
struct neighbour *neigh = NULL;
struct rtable *rt = NULL;
struct flowi4 fl4 = {
.saddr = saddr,
.daddr = daddr
};
if (daddr == cpu_to_be32(INADDR_NONE))
goto out;
rt = ip_route_output_flow(net, &fl4, NULL);
if (IS_ERR(rt))
goto out;
if (rt->rt_uses_gateway && rt->rt_gw_family != AF_INET)
goto out_rt;
neigh = dst_neigh_lookup(&rt->dst, &fl4.daddr);
if (!neigh)
goto out_rt;
memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
*uses_gateway = rt->rt_uses_gateway;
neigh_release(neigh);
ip_rt_put(rt);
return 0;
out_rt:
ip_rt_put(rt);
out:
return -ENOENT;
}
static int smc_ib_determine_gid_rcu(const struct net_device *ndev,
const struct ib_gid_attr *attr,
u8 gid[], u8 *sgid_index,
struct smc_init_info_smcrv2 *smcrv2)
{
if (!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) {
if (gid)
memcpy(gid, &attr->gid, SMC_GID_SIZE);
if (sgid_index)
*sgid_index = attr->index;
return 0;
}
if (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
smc_ib_gid_to_ipv4((u8 *)&attr->gid) != cpu_to_be32(INADDR_NONE)) {
struct in_device *in_dev = __in_dev_get_rcu(ndev);
struct net *net = dev_net(ndev);
const struct in_ifaddr *ifa;
bool subnet_match = false;
if (!in_dev)
goto out;
in_dev_for_each_ifa_rcu(ifa, in_dev) {
if (!inet_ifa_match(smcrv2->saddr, ifa))
continue;
subnet_match = true;
break;
}
if (!subnet_match)
goto out;
if (smcrv2->daddr && smc_ib_find_route(net, smcrv2->saddr,
smcrv2->daddr,
smcrv2->nexthop_mac,
&smcrv2->uses_gateway))
goto out;
if (gid)
memcpy(gid, &attr->gid, SMC_GID_SIZE);
if (sgid_index)
*sgid_index = attr->index;
return 0;
}
out:
return -ENODEV;
}
/* determine the gid for an ib-device port and vlan id */
int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
unsigned short vlan_id, u8 gid[], u8 *sgid_index,
struct smc_init_info_smcrv2 *smcrv2)
{
const struct ib_gid_attr *attr;
const struct net_device *ndev;
int i;
for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
if (IS_ERR(attr))
continue;
rcu_read_lock();
ndev = rdma_read_gid_attr_ndev_rcu(attr);
if (!IS_ERR(ndev) &&
((!vlan_id && !is_vlan_dev(ndev)) ||
(vlan_id && is_vlan_dev(ndev) &&
vlan_dev_vlan_id(ndev) == vlan_id))) {
if (!smc_ib_determine_gid_rcu(ndev, attr, gid,
sgid_index, smcrv2)) {
rcu_read_unlock();
rdma_put_gid_attr(attr);
return 0;
}
}
rcu_read_unlock();
rdma_put_gid_attr(attr);
}
return -ENODEV;
}
/* check if gid is still defined on smcibdev */
static bool smc_ib_check_link_gid(u8 gid[SMC_GID_SIZE], bool smcrv2,
struct smc_ib_device *smcibdev, u8 ibport)
{
const struct ib_gid_attr *attr;
bool rc = false;
int i;
for (i = 0; !rc && i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
if (IS_ERR(attr))
continue;
rcu_read_lock();
if ((!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) ||
(smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
!(ipv6_addr_type((const struct in6_addr *)&attr->gid)
& IPV6_ADDR_LINKLOCAL)))
if (!memcmp(gid, &attr->gid, SMC_GID_SIZE))
rc = true;
rcu_read_unlock();
rdma_put_gid_attr(attr);
}
return rc;
}
/* check all links if the gid is still defined on smcibdev */
static void smc_ib_gid_check(struct smc_ib_device *smcibdev, u8 ibport)
{
struct smc_link_group *lgr;
int i;
spin_lock_bh(&smc_lgr_list.lock);
list_for_each_entry(lgr, &smc_lgr_list.list, list) {
if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
SMC_MAX_PNETID_LEN))
continue; /* lgr is not affected */
if (list_empty(&lgr->list))
continue;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
lgr->lnk[i].smcibdev != smcibdev)
continue;
if (!smc_ib_check_link_gid(lgr->lnk[i].gid,
lgr->smc_version == SMC_V2,
smcibdev, ibport))
smcr_port_err(smcibdev, ibport);
}
}
spin_unlock_bh(&smc_lgr_list.lock);
}
static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
{
int rc;
memset(&smcibdev->pattr[ibport - 1], 0,
sizeof(smcibdev->pattr[ibport - 1]));
rc = ib_query_port(smcibdev->ibdev, ibport,
&smcibdev->pattr[ibport - 1]);
if (rc)
goto out;
/* the SMC protocol requires specification of the RoCE MAC address */
rc = smc_ib_fill_mac(smcibdev, ibport);
if (rc)
goto out;
if (!smc_ib_is_valid_local_systemid() &&
smc_ib_port_active(smcibdev, ibport))
/* create unique system identifier */
smc_ib_define_local_systemid(smcibdev, ibport);
out:
return rc;
}
/* process context wrapper for might_sleep smc_ib_remember_port_attr */
static void smc_ib_port_event_work(struct work_struct *work)
{
struct smc_ib_device *smcibdev = container_of(
work, struct smc_ib_device, port_event_work);
u8 port_idx;
for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
smc_ib_remember_port_attr(smcibdev, port_idx + 1);
clear_bit(port_idx, &smcibdev->port_event_mask);
if (!smc_ib_port_active(smcibdev, port_idx + 1)) {
set_bit(port_idx, smcibdev->ports_going_away);
smcr_port_err(smcibdev, port_idx + 1);
} else {
clear_bit(port_idx, smcibdev->ports_going_away);
smcr_port_add(smcibdev, port_idx + 1);
smc_ib_gid_check(smcibdev, port_idx + 1);
}
}
}
/* can be called in IRQ context */
static void smc_ib_global_event_handler(struct ib_event_handler *handler,
struct ib_event *ibevent)
{
struct smc_ib_device *smcibdev;
bool schedule = false;
u8 port_idx;
smcibdev = container_of(handler, struct smc_ib_device, event_handler);
switch (ibevent->event) {
case IB_EVENT_DEVICE_FATAL:
/* terminate all ports on device */
for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) {
set_bit(port_idx, &smcibdev->port_event_mask);
if (!test_and_set_bit(port_idx,
smcibdev->ports_going_away))
schedule = true;
}
if (schedule)
schedule_work(&smcibdev->port_event_work);
break;
case IB_EVENT_PORT_ACTIVE:
port_idx = ibevent->element.port_num - 1;
if (port_idx >= SMC_MAX_PORTS)
break;
set_bit(port_idx, &smcibdev->port_event_mask);
if (test_and_clear_bit(port_idx, smcibdev->ports_going_away))
schedule_work(&smcibdev->port_event_work);
break;
case IB_EVENT_PORT_ERR:
port_idx = ibevent->element.port_num - 1;
if (port_idx >= SMC_MAX_PORTS)
break;
set_bit(port_idx, &smcibdev->port_event_mask);
if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
schedule_work(&smcibdev->port_event_work);
break;
case IB_EVENT_GID_CHANGE:
port_idx = ibevent->element.port_num - 1;
if (port_idx >= SMC_MAX_PORTS)
break;
set_bit(port_idx, &smcibdev->port_event_mask);
schedule_work(&smcibdev->port_event_work);
break;
default:
break;
}
}
void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
{
if (lnk->roce_pd)
ib_dealloc_pd(lnk->roce_pd);
lnk->roce_pd = NULL;
}
int smc_ib_create_protection_domain(struct smc_link *lnk)
{
int rc;
lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
if (IS_ERR(lnk->roce_pd))
lnk->roce_pd = NULL;
return rc;
}
static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr,
struct smc_ib_device *smcibdev)
{
struct smc_link_group *lgr;
bool rc = false;
int i;
spin_lock_bh(&smc_lgr->lock);
list_for_each_entry(lgr, &smc_lgr->list, list) {
if (lgr->is_smcd)
continue;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
lgr->lnk[i].smcibdev != smcibdev)
continue;
if (lgr->type == SMC_LGR_SINGLE ||
lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) {
rc = true;
goto out;
}
}
}
out:
spin_unlock_bh(&smc_lgr->lock);
return rc;
}
static int smc_nl_handle_dev_port(struct sk_buff *skb,
struct ib_device *ibdev,
struct smc_ib_device *smcibdev,
int port)
{
char smc_pnet[SMC_MAX_PNETID_LEN + 1];
struct nlattr *port_attrs;
unsigned char port_state;
int lnk_count = 0;
port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port);
if (!port_attrs)
goto errout;
if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR,
smcibdev->pnetid_by_user[port]))
goto errattr;
memcpy(smc_pnet, &smcibdev->pnetid[port], SMC_MAX_PNETID_LEN);
smc_pnet[SMC_MAX_PNETID_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
goto errattr;
if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV,
smcibdev->ndev_ifidx[port]))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1))
goto errattr;
port_state = smc_ib_port_active(smcibdev, port + 1);
if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state))
goto errattr;
lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]);
if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count))
goto errattr;
nla_nest_end(skb, port_attrs);
return 0;
errattr:
nla_nest_cancel(skb, port_attrs);
errout:
return -EMSGSIZE;
}
static bool smc_nl_handle_pci_values(const struct smc_pci_dev *smc_pci_dev,
struct sk_buff *skb)
{
if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev->pci_fid))
return false;
if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev->pci_pchid))
return false;
if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev->pci_vendor))
return false;
if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev->pci_device))
return false;
if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev->pci_id))
return false;
return true;
}
static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev,
struct sk_buff *skb,
struct netlink_callback *cb)
{
char smc_ibname[IB_DEVICE_NAME_MAX];
struct smc_pci_dev smc_pci_dev;
struct pci_dev *pci_dev;
unsigned char is_crit;
struct nlattr *attrs;
void *nlh;
int i;
nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&smc_gen_nl_family, NLM_F_MULTI,
SMC_NETLINK_GET_DEV_SMCR);
if (!nlh)
goto errmsg;
attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR);
if (!attrs)
goto errout;
is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev);
if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit))
goto errattr;
if (smcibdev->ibdev->dev.parent) {
memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent);
smc_set_pci_values(pci_dev, &smc_pci_dev);
if (!smc_nl_handle_pci_values(&smc_pci_dev, skb))
goto errattr;
}
snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name);
if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname))
goto errattr;
for (i = 1; i <= SMC_MAX_PORTS; i++) {
if (!rdma_is_port_valid(smcibdev->ibdev, i))
continue;
if (smc_nl_handle_dev_port(skb, smcibdev->ibdev,
smcibdev, i - 1))
goto errattr;
}
nla_nest_end(skb, attrs);
genlmsg_end(skb, nlh);
return 0;
errattr:
nla_nest_cancel(skb, attrs);
errout:
genlmsg_cancel(skb, nlh);
errmsg:
return -EMSGSIZE;
}
static void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list,
struct sk_buff *skb,
struct netlink_callback *cb)
{
struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
struct smc_ib_device *smcibdev;
int snum = cb_ctx->pos[0];
int num = 0;
mutex_lock(&dev_list->mutex);
list_for_each_entry(smcibdev, &dev_list->list, list) {
if (num < snum)
goto next;
if (smc_nl_handle_smcr_dev(smcibdev, skb, cb))
goto errout;
next:
num++;
}
errout:
mutex_unlock(&dev_list->mutex);
cb_ctx->pos[0] = num;
}
int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
{
smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb);
return skb->len;
}
static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
{
struct smc_link *lnk = (struct smc_link *)priv;
struct smc_ib_device *smcibdev = lnk->smcibdev;
u8 port_idx;
switch (ibevent->event) {
case IB_EVENT_QP_FATAL:
case IB_EVENT_QP_ACCESS_ERR:
port_idx = ibevent->element.qp->port - 1;
if (port_idx >= SMC_MAX_PORTS)
break;
set_bit(port_idx, &smcibdev->port_event_mask);
if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
schedule_work(&smcibdev->port_event_work);
break;
default:
break;
}
}
void smc_ib_destroy_queue_pair(struct smc_link *lnk)
{
if (lnk->roce_qp)
ib_destroy_qp(lnk->roce_qp);
lnk->roce_qp = NULL;
}
/* create a queue pair within the protection domain for a link */
int smc_ib_create_queue_pair(struct smc_link *lnk)
{
int sges_per_buf = (lnk->lgr->smc_version == SMC_V2) ? 2 : 1;
struct ib_qp_init_attr qp_attr = {
.event_handler = smc_ib_qp_event_handler,
.qp_context = lnk,
.send_cq = lnk->smcibdev->roce_cq_send,
.recv_cq = lnk->smcibdev->roce_cq_recv,
.srq = NULL,
.cap = {
/* include unsolicited rdma_writes as well,
* there are max. 2 RDMA_WRITE per 1 WR_SEND
*/
.max_send_wr = SMC_WR_BUF_CNT * 3,
.max_recv_wr = SMC_WR_BUF_CNT * 3,
.max_send_sge = SMC_IB_MAX_SEND_SGE,
.max_recv_sge = sges_per_buf,
.max_inline_data = 0,
},
.sq_sig_type = IB_SIGNAL_REQ_WR,
.qp_type = IB_QPT_RC,
};
int rc;
lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
if (IS_ERR(lnk->roce_qp))
lnk->roce_qp = NULL;
else
smc_wr_remember_qp_attr(lnk);
return rc;
}
void smc_ib_put_memory_region(struct ib_mr *mr)
{
ib_dereg_mr(mr);
}
static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx)
{
unsigned int offset = 0;
int sg_num;
/* map the largest prefix of a dma mapped SG list */
sg_num = ib_map_mr_sg(buf_slot->mr[link_idx],
buf_slot->sgt[link_idx].sgl,
buf_slot->sgt[link_idx].orig_nents,
&offset, PAGE_SIZE);
return sg_num;
}
/* Allocate a memory region and map the dma mapped SG list of buf_slot */
int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
struct smc_buf_desc *buf_slot, u8 link_idx)
{
if (buf_slot->mr[link_idx])
return 0; /* already done */
buf_slot->mr[link_idx] =
ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
if (IS_ERR(buf_slot->mr[link_idx])) {
int rc;
rc = PTR_ERR(buf_slot->mr[link_idx]);
buf_slot->mr[link_idx] = NULL;
return rc;
}
if (smc_ib_map_mr_sg(buf_slot, link_idx) !=
buf_slot->sgt[link_idx].orig_nents)
return -EINVAL;
return 0;
}
bool smc_ib_is_sg_need_sync(struct smc_link *lnk,
struct smc_buf_desc *buf_slot)
{
struct scatterlist *sg;
unsigned int i;
bool ret = false;
/* for now there is just one DMA address */
for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
buf_slot->sgt[lnk->link_idx].nents, i) {
if (!sg_dma_len(sg))
break;
if (dma_need_sync(lnk->smcibdev->ibdev->dma_device,
sg_dma_address(sg))) {
ret = true;
goto out;
}
}
out:
return ret;
}
/* synchronize buffer usage for cpu access */
void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction)
{
struct scatterlist *sg;
unsigned int i;
if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
return;
/* for now there is just one DMA address */
for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
buf_slot->sgt[lnk->link_idx].nents, i) {
if (!sg_dma_len(sg))
break;
ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev,
sg_dma_address(sg),
sg_dma_len(sg),
data_direction);
}
}
/* synchronize buffer usage for device access */
void smc_ib_sync_sg_for_device(struct smc_link *lnk,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction)
{
struct scatterlist *sg;
unsigned int i;
if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
return;
/* for now there is just one DMA address */
for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
buf_slot->sgt[lnk->link_idx].nents, i) {
if (!sg_dma_len(sg))
break;
ib_dma_sync_single_for_device(lnk->smcibdev->ibdev,
sg_dma_address(sg),
sg_dma_len(sg),
data_direction);
}
}
/* Map a new TX or RX buffer SG-table to DMA */
int smc_ib_buf_map_sg(struct smc_link *lnk,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction)
{
int mapped_nents;
mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev,
buf_slot->sgt[lnk->link_idx].sgl,
buf_slot->sgt[lnk->link_idx].orig_nents,
data_direction);
if (!mapped_nents)
return -ENOMEM;
return mapped_nents;
}
void smc_ib_buf_unmap_sg(struct smc_link *lnk,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction)
{
if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address)
return; /* already unmapped */
ib_dma_unmap_sg(lnk->smcibdev->ibdev,
buf_slot->sgt[lnk->link_idx].sgl,
buf_slot->sgt[lnk->link_idx].orig_nents,
data_direction);
buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0;
}
long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
{
struct ib_cq_init_attr cqattr = {
.cqe = SMC_MAX_CQE, .comp_vector = 0 };
int cqe_size_order, smc_order;
long rc;
mutex_lock(&smcibdev->mutex);
rc = 0;
if (smcibdev->initialized)
goto out;
/* the calculated number of cq entries fits to mlx5 cq allocation */
cqe_size_order = cache_line_size() == 128 ? 7 : 6;
smc_order = MAX_PAGE_ORDER - cqe_size_order;
if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
smc_wr_tx_cq_handler, NULL,
smcibdev, &cqattr);
rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
if (IS_ERR(smcibdev->roce_cq_send)) {
smcibdev->roce_cq_send = NULL;
goto out;
}
smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
smc_wr_rx_cq_handler, NULL,
smcibdev, &cqattr);
rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
if (IS_ERR(smcibdev->roce_cq_recv)) {
smcibdev->roce_cq_recv = NULL;
goto err;
}
smc_wr_add_dev(smcibdev);
smcibdev->initialized = 1;
goto out;
err:
ib_destroy_cq(smcibdev->roce_cq_send);
out:
mutex_unlock(&smcibdev->mutex);
return rc;
}
static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
{
mutex_lock(&smcibdev->mutex);
if (!smcibdev->initialized)
goto out;
smcibdev->initialized = 0;
ib_destroy_cq(smcibdev->roce_cq_recv);
ib_destroy_cq(smcibdev->roce_cq_send);
smc_wr_remove_dev(smcibdev);
out:
mutex_unlock(&smcibdev->mutex);
}
static struct ib_client smc_ib_client;
static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port)
{
struct ib_device *ibdev = smcibdev->ibdev;
struct net_device *ndev;
if (!ibdev->ops.get_netdev)
return;
ndev = ibdev->ops.get_netdev(ibdev, port + 1);
if (ndev) {
smcibdev->ndev_ifidx[port] = ndev->ifindex;
dev_put(ndev);
}
}
void smc_ib_ndev_change(struct net_device *ndev, unsigned long event)
{
struct smc_ib_device *smcibdev;
struct ib_device *libdev;
struct net_device *lndev;
u8 port_cnt;
int i;
mutex_lock(&smc_ib_devices.mutex);
list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
port_cnt = smcibdev->ibdev->phys_port_cnt;
for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
libdev = smcibdev->ibdev;
if (!libdev->ops.get_netdev)
continue;
lndev = libdev->ops.get_netdev(libdev, i + 1);
dev_put(lndev);
if (lndev != ndev)
continue;
if (event == NETDEV_REGISTER)
smcibdev->ndev_ifidx[i] = ndev->ifindex;
if (event == NETDEV_UNREGISTER)
smcibdev->ndev_ifidx[i] = 0;
}
}
mutex_unlock(&smc_ib_devices.mutex);
}
/* callback function for ib_register_client() */
static int smc_ib_add_dev(struct ib_device *ibdev)
{
struct smc_ib_device *smcibdev;
u8 port_cnt;
int i;
if (ibdev->node_type != RDMA_NODE_IB_CA)
return -EOPNOTSUPP;
smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
if (!smcibdev)
return -ENOMEM;
smcibdev->ibdev = ibdev;
INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
atomic_set(&smcibdev->lnk_cnt, 0);
init_waitqueue_head(&smcibdev->lnks_deleted);
mutex_init(&smcibdev->mutex);
mutex_lock(&smc_ib_devices.mutex);
list_add_tail(&smcibdev->list, &smc_ib_devices.list);
mutex_unlock(&smc_ib_devices.mutex);
ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
smc_ib_global_event_handler);
ib_register_event_handler(&smcibdev->event_handler);
/* trigger reading of the port attributes */
port_cnt = smcibdev->ibdev->phys_port_cnt;
pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
smcibdev->ibdev->name, port_cnt);
for (i = 0;
i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
i++) {
set_bit(i, &smcibdev->port_event_mask);
/* determine pnetids of the port */
if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
smcibdev->pnetid[i]))
smc_pnetid_by_table_ib(smcibdev, i + 1);
smc_copy_netdev_ifindex(smcibdev, i);
pr_warn_ratelimited("smc: ib device %s port %d has pnetid "
"%.16s%s\n",
smcibdev->ibdev->name, i + 1,
smcibdev->pnetid[i],
smcibdev->pnetid_by_user[i] ?
" (user defined)" :
"");
}
schedule_work(&smcibdev->port_event_work);
return 0;
}
/* callback function for ib_unregister_client() */
static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
{
struct smc_ib_device *smcibdev = client_data;
mutex_lock(&smc_ib_devices.mutex);
list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
mutex_unlock(&smc_ib_devices.mutex);
pr_warn_ratelimited("smc: removing ib device %s\n",
smcibdev->ibdev->name);
smc_smcr_terminate_all(smcibdev);
smc_ib_cleanup_per_ibdev(smcibdev);
ib_unregister_event_handler(&smcibdev->event_handler);
cancel_work_sync(&smcibdev->port_event_work);
kfree(smcibdev);
}
static struct ib_client smc_ib_client = {
.name = "smc_ib",
.add = smc_ib_add_dev,
.remove = smc_ib_remove_dev,
};
int __init smc_ib_register_client(void)
{
smc_ib_init_local_systemid();
return ib_register_client(&smc_ib_client);
}
void smc_ib_unregister_client(void)
{
ib_unregister_client(&smc_ib_client);
}
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