Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 439 insertions, 0 deletions

diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
new file mode 100644
index 000000000..8e33c0128
--- /dev/null
+++ b/net/smc/smc_ism.c
@@ -0,0 +1,439 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Shared Memory Communications Direct over ISM devices (SMC-D)
+ *
+ * Functions for ISM device.
+ *
+ * Copyright IBM Corp. 2018
+ */
+
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <asm/page.h>
+
+#include "smc.h"
+#include "smc_core.h"
+#include "smc_ism.h"
+#include "smc_pnet.h"
+
+struct smcd_dev_list smcd_dev_list = {
+        .list = LIST_HEAD_INIT(smcd_dev_list.list),
+        .mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
+};
+
+bool smc_ism_v2_capable;
+
+/* Test if an ISM communication is possible - same CPC */
+int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *smcd)
+{
+        return smcd->ops->query_remote_gid(smcd, peer_gid, vlan_id ? 1 : 0,
+                                           vlan_id);
+}
+
+int smc_ism_write(struct smcd_dev *smcd, const struct smc_ism_position *pos,
+                  void *data, size_t len)
+{
+        int rc;
+
+        rc = smcd->ops->move_data(smcd, pos->token, pos->index, pos->signal,
+                                  pos->offset, data, len);
+
+        return rc < 0 ? rc : 0;
+}
+
+void smc_ism_get_system_eid(struct smcd_dev *smcd, u8 **eid)
+{
+        smcd->ops->get_system_eid(smcd, eid);
+}
+
+u16 smc_ism_get_chid(struct smcd_dev *smcd)
+{
+        return smcd->ops->get_chid(smcd);
+}
+
+/* Set a connection using this DMBE. */
+void smc_ism_set_conn(struct smc_connection *conn)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
+        conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = conn;
+        spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
+}
+
+/* Unset a connection using this DMBE. */
+void smc_ism_unset_conn(struct smc_connection *conn)
+{
+        unsigned long flags;
+
+        if (!conn->rmb_desc)
+                return;
+
+        spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
+        conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = NULL;
+        spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
+}
+
+/* Register a VLAN identifier with the ISM device. Use a reference count
+ * and add a VLAN identifier only when the first DMB using this VLAN is
+ * registered.
+ */
+int smc_ism_get_vlan(struct smcd_dev *smcd, unsigned short vlanid)
+{
+        struct smc_ism_vlanid *new_vlan, *vlan;
+        unsigned long flags;
+        int rc = 0;
+
+        if (!vlanid)                    /* No valid vlan id */
+                return -EINVAL;
+
+        /* create new vlan entry, in case we need it */
+        new_vlan = kzalloc(sizeof(*new_vlan), GFP_KERNEL);
+        if (!new_vlan)
+                return -ENOMEM;
+        new_vlan->vlanid = vlanid;
+        refcount_set(&new_vlan->refcnt, 1);
+
+        /* if there is an existing entry, increase count and return */
+        spin_lock_irqsave(&smcd->lock, flags);
+        list_for_each_entry(vlan, &smcd->vlan, list) {
+                if (vlan->vlanid == vlanid) {
+                        refcount_inc(&vlan->refcnt);
+                        kfree(new_vlan);
+                        goto out;
+                }
+        }
+
+        /* no existing entry found.
+         * add new entry to device; might fail, e.g., if HW limit reached
+         */
+        if (smcd->ops->add_vlan_id(smcd, vlanid)) {
+                kfree(new_vlan);
+                rc = -EIO;
+                goto out;
+        }
+        list_add_tail(&new_vlan->list, &smcd->vlan);
+out:
+        spin_unlock_irqrestore(&smcd->lock, flags);
+        return rc;
+}
+
+/* Unregister a VLAN identifier with the ISM device. Use a reference count
+ * and remove a VLAN identifier only when the last DMB using this VLAN is
+ * unregistered.
+ */
+int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid)
+{
+        struct smc_ism_vlanid *vlan;
+        unsigned long flags;
+        bool found = false;
+        int rc = 0;
+
+        if (!vlanid)                    /* No valid vlan id */
+                return -EINVAL;
+
+        spin_lock_irqsave(&smcd->lock, flags);
+        list_for_each_entry(vlan, &smcd->vlan, list) {
+                if (vlan->vlanid == vlanid) {
+                        if (!refcount_dec_and_test(&vlan->refcnt))
+                                goto out;
+                        found = true;
+                        break;
+                }
+        }
+        if (!found) {
+                rc = -ENOENT;
+                goto out;               /* VLAN id not in table */
+        }
+
+        /* Found and the last reference just gone */
+        if (smcd->ops->del_vlan_id(smcd, vlanid))
+                rc = -EIO;
+        list_del(&vlan->list);
+        kfree(vlan);
+out:
+        spin_unlock_irqrestore(&smcd->lock, flags);
+        return rc;
+}
+
+int smc_ism_unregister_dmb(struct smcd_dev *smcd, struct smc_buf_desc *dmb_desc)
+{
+        struct smcd_dmb dmb;
+        int rc = 0;
+
+        if (!dmb_desc->dma_addr)
+                return rc;
+
+        memset(&dmb, 0, sizeof(dmb));
+        dmb.dmb_tok = dmb_desc->token;
+        dmb.sba_idx = dmb_desc->sba_idx;
+        dmb.cpu_addr = dmb_desc->cpu_addr;
+        dmb.dma_addr = dmb_desc->dma_addr;
+        dmb.dmb_len = dmb_desc->len;
+        rc = smcd->ops->unregister_dmb(smcd, &dmb);
+        if (!rc || rc == ISM_ERROR) {
+                dmb_desc->cpu_addr = NULL;
+                dmb_desc->dma_addr = 0;
+        }
+
+        return rc;
+}
+
+int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
+                         struct smc_buf_desc *dmb_desc)
+{
+        struct smcd_dmb dmb;
+        int rc;
+
+        memset(&dmb, 0, sizeof(dmb));
+        dmb.dmb_len = dmb_len;
+        dmb.sba_idx = dmb_desc->sba_idx;
+        dmb.vlan_id = lgr->vlan_id;
+        dmb.rgid = lgr->peer_gid;
+        rc = lgr->smcd->ops->register_dmb(lgr->smcd, &dmb);
+        if (!rc) {
+                dmb_desc->sba_idx = dmb.sba_idx;
+                dmb_desc->token = dmb.dmb_tok;
+                dmb_desc->cpu_addr = dmb.cpu_addr;
+                dmb_desc->dma_addr = dmb.dma_addr;
+                dmb_desc->len = dmb.dmb_len;
+        }
+        return rc;
+}
+
+struct smc_ism_event_work {
+        struct work_struct work;
+        struct smcd_dev *smcd;
+        struct smcd_event event;
+};
+
+#define ISM_EVENT_REQUEST               0x0001
+#define ISM_EVENT_RESPONSE              0x0002
+#define ISM_EVENT_REQUEST_IR            0x00000001
+#define ISM_EVENT_CODE_SHUTDOWN         0x80
+#define ISM_EVENT_CODE_TESTLINK         0x83
+
+union smcd_sw_event_info {
+        u64     info;
+        struct {
+                u8              uid[SMC_LGR_ID_SIZE];
+                unsigned short  vlan_id;
+                u16             code;
+        };
+};
+
+static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
+{
+        union smcd_sw_event_info ev_info;
+
+        ev_info.info = wrk->event.info;
+        switch (wrk->event.code) {
+        case ISM_EVENT_CODE_SHUTDOWN:   /* Peer shut down DMBs */
+                smc_smcd_terminate(wrk->smcd, wrk->event.tok, ev_info.vlan_id);
+                break;
+        case ISM_EVENT_CODE_TESTLINK:   /* Activity timer */
+                if (ev_info.code == ISM_EVENT_REQUEST) {
+                        ev_info.code = ISM_EVENT_RESPONSE;
+                        wrk->smcd->ops->signal_event(wrk->smcd,
+                                                     wrk->event.tok,
+                                                     ISM_EVENT_REQUEST_IR,
+                                                     ISM_EVENT_CODE_TESTLINK,
+                                                     ev_info.info);
+                        }
+                break;
+        }
+}
+
+int smc_ism_signal_shutdown(struct smc_link_group *lgr)
+{
+        int rc;
+        union smcd_sw_event_info ev_info;
+
+        if (lgr->peer_shutdown)
+                return 0;
+
+        memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
+        ev_info.vlan_id = lgr->vlan_id;
+        ev_info.code = ISM_EVENT_REQUEST;
+        rc = lgr->smcd->ops->signal_event(lgr->smcd, lgr->peer_gid,
+                                          ISM_EVENT_REQUEST_IR,
+                                          ISM_EVENT_CODE_SHUTDOWN,
+                                          ev_info.info);
+        return rc;
+}
+
+/* worker for SMC-D events */
+static void smc_ism_event_work(struct work_struct *work)
+{
+        struct smc_ism_event_work *wrk =
+                container_of(work, struct smc_ism_event_work, work);
+
+        switch (wrk->event.type) {
+        case ISM_EVENT_GID:     /* GID event, token is peer GID */
+                smc_smcd_terminate(wrk->smcd, wrk->event.tok, VLAN_VID_MASK);
+                break;
+        case ISM_EVENT_DMB:
+                break;
+        case ISM_EVENT_SWR:     /* Software defined event */
+                smcd_handle_sw_event(wrk);
+                break;
+        }
+        kfree(wrk);
+}
+
+static void smcd_release(struct device *dev)
+{
+        struct smcd_dev *smcd = container_of(dev, struct smcd_dev, dev);
+
+        kfree(smcd->conn);
+        kfree(smcd);
+}
+
+struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
+                                const struct smcd_ops *ops, int max_dmbs)
+{
+        struct smcd_dev *smcd;
+
+        smcd = kzalloc(sizeof(*smcd), GFP_KERNEL);
+        if (!smcd)
+                return NULL;
+        smcd->conn = kcalloc(max_dmbs, sizeof(struct smc_connection *),
+                             GFP_KERNEL);
+        if (!smcd->conn) {
+                kfree(smcd);
+                return NULL;
+        }
+
+        smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
+                                                 WQ_MEM_RECLAIM, name);
+        if (!smcd->event_wq) {
+                kfree(smcd->conn);
+                kfree(smcd);
+                return NULL;
+        }
+
+        smcd->dev.parent = parent;
+        smcd->dev.release = smcd_release;
+        device_initialize(&smcd->dev);
+        dev_set_name(&smcd->dev, name);
+        smcd->ops = ops;
+        if (smc_pnetid_by_dev_port(parent, 0, smcd->pnetid))
+                smc_pnetid_by_table_smcd(smcd);
+
+        spin_lock_init(&smcd->lock);
+        spin_lock_init(&smcd->lgr_lock);
+        INIT_LIST_HEAD(&smcd->vlan);
+        INIT_LIST_HEAD(&smcd->lgr_list);
+        init_waitqueue_head(&smcd->lgrs_deleted);
+        return smcd;
+}
+EXPORT_SYMBOL_GPL(smcd_alloc_dev);
+
+int smcd_register_dev(struct smcd_dev *smcd)
+{
+        int rc;
+
+        mutex_lock(&smcd_dev_list.mutex);
+        if (list_empty(&smcd_dev_list.list)) {
+                u8 *system_eid = NULL;
+
+                smc_ism_get_system_eid(smcd, &system_eid);
+                if (system_eid[24] != '0' || system_eid[28] != '0')
+                        smc_ism_v2_capable = true;
+        }
+        /* sort list: devices without pnetid before devices with pnetid */
+        if (smcd->pnetid[0])
+                list_add_tail(&smcd->list, &smcd_dev_list.list);
+        else
+                list_add(&smcd->list, &smcd_dev_list.list);
+        mutex_unlock(&smcd_dev_list.mutex);
+
+        pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
+                            dev_name(&smcd->dev), smcd->pnetid,
+                            smcd->pnetid_by_user ? " (user defined)" : "");
+
+        rc = device_add(&smcd->dev);
+        if (rc) {
+                mutex_lock(&smcd_dev_list.mutex);
+                list_del(&smcd->list);
+                mutex_unlock(&smcd_dev_list.mutex);
+        }
+
+        return rc;
+}
+EXPORT_SYMBOL_GPL(smcd_register_dev);
+
+void smcd_unregister_dev(struct smcd_dev *smcd)
+{
+        pr_warn_ratelimited("smc: removing smcd device %s\n",
+                            dev_name(&smcd->dev));
+        mutex_lock(&smcd_dev_list.mutex);
+        list_del_init(&smcd->list);
+        mutex_unlock(&smcd_dev_list.mutex);
+        smcd->going_away = 1;
+        smc_smcd_terminate_all(smcd);
+        flush_workqueue(smcd->event_wq);
+        destroy_workqueue(smcd->event_wq);
+
+        device_del(&smcd->dev);
+}
+EXPORT_SYMBOL_GPL(smcd_unregister_dev);
+
+void smcd_free_dev(struct smcd_dev *smcd)
+{
+        put_device(&smcd->dev);
+}
+EXPORT_SYMBOL_GPL(smcd_free_dev);
+
+/* SMCD Device event handler. Called from ISM device interrupt handler.
+ * Parameters are smcd device pointer,
+ * - event->type (0 --> DMB, 1 --> GID),
+ * - event->code (event code),
+ * - event->tok (either DMB token when event type 0, or GID when event type 1)
+ * - event->time (time of day)
+ * - event->info (debug info).
+ *
+ * Context:
+ * - Function called in IRQ context from ISM device driver event handler.
+ */
+void smcd_handle_event(struct smcd_dev *smcd, struct smcd_event *event)
+{
+        struct smc_ism_event_work *wrk;
+
+        if (smcd->going_away)
+                return;
+        /* copy event to event work queue, and let it be handled there */
+        wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
+        if (!wrk)
+                return;
+        INIT_WORK(&wrk->work, smc_ism_event_work);
+        wrk->smcd = smcd;
+        wrk->event = *event;
+        queue_work(smcd->event_wq, &wrk->work);
+}
+EXPORT_SYMBOL_GPL(smcd_handle_event);
+
+/* SMCD Device interrupt handler. Called from ISM device interrupt handler.
+ * Parameters are smcd device pointer and DMB number. Find the connection and
+ * schedule the tasklet for this connection.
+ *
+ * Context:
+ * - Function called in IRQ context from ISM device driver IRQ handler.
+ */
+void smcd_handle_irq(struct smcd_dev *smcd, unsigned int dmbno)
+{
+        struct smc_connection *conn = NULL;
+        unsigned long flags;
+
+        spin_lock_irqsave(&smcd->lock, flags);
+        conn = smcd->conn[dmbno];
+        if (conn && !conn->killed)
+                tasklet_schedule(&conn->rx_tsklet);
+        spin_unlock_irqrestore(&smcd->lock, flags);
+}
+EXPORT_SYMBOL_GPL(smcd_handle_irq);
+
+void __init smc_ism_init(void)
+{
+        smc_ism_v2_capable = false;
+}