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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/net/smc/smc_ism.c
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@@ -7,6 +7,7 @@
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  */
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8
 
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 #include <linux/spinlock.h>
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+#include <linux/mutex.h>
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 #include <linux/slab.h>
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 #include <asm/page.h>
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13
 
..
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@@ -17,10 +18,12 @@
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18
 
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 struct smcd_dev_list smcd_dev_list = {
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 	.list = LIST_HEAD_INIT(smcd_dev_list.list),
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-	.lock = __SPIN_LOCK_UNLOCKED(smcd_dev_list.lock)
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+	.mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
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 };
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23
 
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-/* Test if an ISM communication is possible. */
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+bool smc_ism_v2_capable;
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+
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+/* Test if an ISM communication is possible - same CPC */
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 int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *smcd)
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 {
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 	return smcd->ops->query_remote_gid(smcd, peer_gid, vlan_id ? 1 : 0,
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@@ -36,6 +39,16 @@
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 				  pos->offset, data, len);
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 	return rc < 0 ? rc : 0;
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+}
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+
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+void smc_ism_get_system_eid(struct smcd_dev *smcd, u8 **eid)
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+{
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+	smcd->ops->get_system_eid(smcd, eid);
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+}
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+
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+u16 smc_ism_get_chid(struct smcd_dev *smcd)
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+{
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+	return smcd->ops->get_chid(smcd);
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 }
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 /* Set a connection using this DMBE. */
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@@ -146,6 +159,10 @@
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 int smc_ism_unregister_dmb(struct smcd_dev *smcd, struct smc_buf_desc *dmb_desc)
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 {
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 	struct smcd_dmb dmb;
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+	int rc = 0;
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+
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+	if (!dmb_desc->dma_addr)
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+		return rc;
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 	memset(&dmb, 0, sizeof(dmb));
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 	dmb.dmb_tok = dmb_desc->token;
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@@ -153,7 +170,13 @@
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 	dmb.cpu_addr = dmb_desc->cpu_addr;
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 	dmb.dma_addr = dmb_desc->dma_addr;
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 	dmb.dmb_len = dmb_desc->len;
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-	return smcd->ops->unregister_dmb(smcd, &dmb);
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+	rc = smcd->ops->unregister_dmb(smcd, &dmb);
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+	if (!rc || rc == ISM_ERROR) {
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+		dmb_desc->cpu_addr = NULL;
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+		dmb_desc->dma_addr = 0;
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+	}
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+
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+	return rc;
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 }
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 int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
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@@ -187,22 +210,28 @@
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 #define ISM_EVENT_REQUEST		0x0001
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 #define ISM_EVENT_RESPONSE		0x0002
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 #define ISM_EVENT_REQUEST_IR		0x00000001
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+#define ISM_EVENT_CODE_SHUTDOWN		0x80
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 #define ISM_EVENT_CODE_TESTLINK		0x83
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+
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+union smcd_sw_event_info {
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+	u64	info;
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+	struct {
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+		u8		uid[SMC_LGR_ID_SIZE];
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+		unsigned short	vlan_id;
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+		u16		code;
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+	};
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+};
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 static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
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 {
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-	union {
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-		u64	info;
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-		struct {
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-			u32		uid;
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-			unsigned short	vlanid;
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-			u16		code;
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-		};
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-	} ev_info;
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+	union smcd_sw_event_info ev_info;
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228
 
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+	ev_info.info = wrk->event.info;
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 	switch (wrk->event.code) {
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+	case ISM_EVENT_CODE_SHUTDOWN:	/* Peer shut down DMBs */
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+		smc_smcd_terminate(wrk->smcd, wrk->event.tok, ev_info.vlan_id);
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+		break;
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 	case ISM_EVENT_CODE_TESTLINK:	/* Activity timer */
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-		ev_info.info = wrk->event.info;
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 		if (ev_info.code == ISM_EVENT_REQUEST) {
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 			ev_info.code = ISM_EVENT_RESPONSE;
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 			wrk->smcd->ops->signal_event(wrk->smcd,
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@@ -215,6 +244,24 @@
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 	}
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 }
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246
 
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+int smc_ism_signal_shutdown(struct smc_link_group *lgr)
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+{
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+	int rc;
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+	union smcd_sw_event_info ev_info;
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+
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+	if (lgr->peer_shutdown)
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+		return 0;
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+
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+	memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
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+	ev_info.vlan_id = lgr->vlan_id;
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+	ev_info.code = ISM_EVENT_REQUEST;
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+	rc = lgr->smcd->ops->signal_event(lgr->smcd, lgr->peer_gid,
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+					  ISM_EVENT_REQUEST_IR,
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+					  ISM_EVENT_CODE_SHUTDOWN,
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+					  ev_info.info);
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+	return rc;
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+}
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+
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 /* worker for SMC-D events */
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 static void smc_ism_event_work(struct work_struct *work)
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 {
..
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@@ -223,7 +270,7 @@
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270
 
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 	switch (wrk->event.type) {
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 	case ISM_EVENT_GID:	/* GID event, token is peer GID */
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-		smc_smcd_terminate(wrk->smcd, wrk->event.tok);
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+		smc_smcd_terminate(wrk->smcd, wrk->event.tok, VLAN_VID_MASK);
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 		break;
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 	case ISM_EVENT_DMB:
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 		break;
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@@ -257,39 +304,76 @@
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 		return NULL;
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 	}
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+	smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
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+						 WQ_MEM_RECLAIM, name);
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+	if (!smcd->event_wq) {
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+		kfree(smcd->conn);
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+		kfree(smcd);
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+		return NULL;
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+	}
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+
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 	smcd->dev.parent = parent;
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 	smcd->dev.release = smcd_release;
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 	device_initialize(&smcd->dev);
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 	dev_set_name(&smcd->dev, name);
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 	smcd->ops = ops;
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-	smc_pnetid_by_dev_port(parent, 0, smcd->pnetid);
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+	if (smc_pnetid_by_dev_port(parent, 0, smcd->pnetid))
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+		smc_pnetid_by_table_smcd(smcd);
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 	spin_lock_init(&smcd->lock);
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+	spin_lock_init(&smcd->lgr_lock);
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 	INIT_LIST_HEAD(&smcd->vlan);
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-	smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
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-						 WQ_MEM_RECLAIM, name);
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+	INIT_LIST_HEAD(&smcd->lgr_list);
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+	init_waitqueue_head(&smcd->lgrs_deleted);
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 	return smcd;
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 }
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 EXPORT_SYMBOL_GPL(smcd_alloc_dev);
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 int smcd_register_dev(struct smcd_dev *smcd)
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 {
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-	spin_lock(&smcd_dev_list.lock);
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-	list_add_tail(&smcd->list, &smcd_dev_list.list);
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-	spin_unlock(&smcd_dev_list.lock);
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+	int rc;
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-	return device_add(&smcd->dev);
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+	mutex_lock(&smcd_dev_list.mutex);
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+	if (list_empty(&smcd_dev_list.list)) {
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+		u8 *system_eid = NULL;
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+
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+		smc_ism_get_system_eid(smcd, &system_eid);
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+		if (system_eid[24] != '0' || system_eid[28] != '0')
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+			smc_ism_v2_capable = true;
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+	}
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+	/* sort list: devices without pnetid before devices with pnetid */
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+	if (smcd->pnetid[0])
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+		list_add_tail(&smcd->list, &smcd_dev_list.list);
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+	else
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+		list_add(&smcd->list, &smcd_dev_list.list);
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+	mutex_unlock(&smcd_dev_list.mutex);
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+
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+	pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
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+			    dev_name(&smcd->dev), smcd->pnetid,
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+			    smcd->pnetid_by_user ? " (user defined)" : "");
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+
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+	rc = device_add(&smcd->dev);
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+	if (rc) {
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+		mutex_lock(&smcd_dev_list.mutex);
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+		list_del(&smcd->list);
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+		mutex_unlock(&smcd_dev_list.mutex);
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+	}
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+
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+	return rc;
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 }
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 EXPORT_SYMBOL_GPL(smcd_register_dev);
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365
 
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 void smcd_unregister_dev(struct smcd_dev *smcd)
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 {
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-	spin_lock(&smcd_dev_list.lock);
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-	list_del(&smcd->list);
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-	spin_unlock(&smcd_dev_list.lock);
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+	pr_warn_ratelimited("smc: removing smcd device %s\n",
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+			    dev_name(&smcd->dev));
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+	mutex_lock(&smcd_dev_list.mutex);
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+	list_del_init(&smcd->list);
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+	mutex_unlock(&smcd_dev_list.mutex);
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+	smcd->going_away = 1;
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+	smc_smcd_terminate_all(smcd);
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 	flush_workqueue(smcd->event_wq);
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 	destroy_workqueue(smcd->event_wq);
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-	smc_smcd_terminate(smcd, 0);
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377
 
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 	device_del(&smcd->dev);
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 }
..
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@@ -316,6 +400,8 @@
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 {
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 	struct smc_ism_event_work *wrk;
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402
 
403
+	if (smcd->going_away)
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+		return;
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 	/* copy event to event work queue, and let it be handled there */
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 	wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
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 	if (!wrk)
..
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@@ -341,8 +427,13 @@
341
427
 
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 	spin_lock_irqsave(&smcd->lock, flags);
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 	conn = smcd->conn[dmbno];
344
-	if (conn)
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+	if (conn && !conn->killed)
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 		tasklet_schedule(&conn->rx_tsklet);
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 	spin_unlock_irqrestore(&smcd->lock, flags);
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 }
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 EXPORT_SYMBOL_GPL(smcd_handle_irq);
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+
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+void __init smc_ism_init(void)
437
+{
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+	smc_ism_v2_capable = false;
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+}