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-rw-r--r--net/smc/smc_ib.c1018
1 files changed, 1018 insertions, 0 deletions
diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c
new file mode 100644
index 000000000..ace861173
--- /dev/null
+++ b/net/smc/smc_ib.c
@@ -0,0 +1,1018 @@
+// 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 <ubraun@linux.vnet.ibm.com>
+ */
+
+#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;
+ neigh = rt->dst.ops->neigh_lookup(&rt->dst, NULL, &fl4.daddr);
+ if (neigh) {
+ memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
+ *uses_gateway = rt->rt_uses_gateway;
+ return 0;
+ }
+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_ORDER - cqe_size_order - 1;
+ 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);
+}