Merge branch 'net-smc-introduce-SMC-Dv2-support'

Karsten Graul says:

====================
net/smc: introduce SMC-Dv2 support

SMC-Dv2 support (see https://www.ibm.com/support/pages/node/6326337)
provides multi-subnet support for SMC-D, eliminating the current
same-subnet restriction. The new version detects if any of the virtual
ISM devices are on the same system and can therefore be used for an
SMC-Dv2 connection. Furthermore, SMC-Dv2 eliminates the need for
PNET IDs on s390.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/ism.h

@@ -16,6 +16,7 @@
 #define ISM_DMB_WORD_OFFSET	1
 #define ISM_DMB_BIT_OFFSET	(ISM_DMB_WORD_OFFSET * 32)
 #define ISM_NR_DMBS		1920
+#define ISM_IDENT_MASK		0x00FFFF
 
 #define ISM_REG_SBA	0x1
 #define ISM_REG_IEQ	0x2
@@ -206,6 +207,12 @@ struct ism_dev {
 #define ISM_CREATE_REQ(dmb, idx, sf, offset)		\
 	((dmb) | (idx) << 24 | (sf) << 23 | (offset))
 
+struct ism_systemeid {
+	u8	seid_string[24];
+	u8	serial_number[4];
+	u8	type[4];
+};
+
 static inline void __ism_read_cmd(struct ism_dev *ism, void *data,
 				  unsigned long offset, unsigned long len)
 {

drivers/s390/net/ism_drv.c

@@ -13,6 +13,8 @@
 #include <linux/device.h>
 #include <linux/pci.h>
 #include <linux/err.h>
+#include <linux/ctype.h>
+#include <linux/processor.h>
 #include <net/smc.h>
 
 #include <asm/debug.h>
@@ -387,6 +389,42 @@ static int ism_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
 	return 0;
 }
 
+static struct ism_systemeid SYSTEM_EID = {
+	.seid_string = "IBM-SYSZ-IBMSEID00000000",
+	.serial_number = "0000",
+	.type = "0000",
+};
+
+static void ism_create_system_eid(void)
+{
+	struct cpuid id;
+	u16 ident_tail;
+	char tmp[5];
+
+	get_cpu_id(&id);
+	ident_tail = (u16)(id.ident & ISM_IDENT_MASK);
+	snprintf(tmp, 5, "%04X", ident_tail);
+	memcpy(&SYSTEM_EID.serial_number, tmp, 4);
+	snprintf(tmp, 5, "%04X", id.machine);
+	memcpy(&SYSTEM_EID.type, tmp, 4);
+}
+
+static void ism_get_system_eid(struct smcd_dev *smcd, u8 **eid)
+{
+	*eid = &SYSTEM_EID.seid_string[0];
+}
+
+static u16 ism_get_chid(struct smcd_dev *smcd)
+{
+	struct ism_dev *ismdev;
+
+	ismdev = (struct ism_dev *)smcd->priv;
+	if (!ismdev || !ismdev->pdev)
+		return 0;
+
+	return to_zpci(ismdev->pdev)->pchid;
+}
+
 static void ism_handle_event(struct ism_dev *ism)
 {
 	struct smcd_event *entry;
@@ -443,6 +481,8 @@ static const struct smcd_ops ism_ops = {
 	.reset_vlan_required = ism_reset_vlan_required,
 	.signal_event = ism_signal_ieq,
 	.move_data = ism_move,
+	.get_system_eid = ism_get_system_eid,
+	.get_chid = ism_get_chid,
 };
 
 static int ism_dev_init(struct ism_dev *ism)
@@ -471,6 +511,10 @@ static int ism_dev_init(struct ism_dev *ism)
 	if (ret)
 		goto unreg_ieq;
 
+	if (!ism_add_vlan_id(ism->smcd, ISM_RESERVED_VLANID))
+		/* hardware is V2 capable */
+		ism_create_system_eid();
+
 	ret = smcd_register_dev(ism->smcd);
 	if (ret)
 		goto unreg_ieq;
@@ -550,6 +594,9 @@ static void ism_dev_exit(struct ism_dev *ism)
 	struct pci_dev *pdev = ism->pdev;
 
 	smcd_unregister_dev(ism->smcd);
+	if (SYSTEM_EID.serial_number[0] != '0' ||
+	    SYSTEM_EID.type[0] != '0')
+		ism_del_vlan_id(ism->smcd, ISM_RESERVED_VLANID);
 	unregister_ieq(ism);
 	unregister_sba(ism);
 	free_irq(pci_irq_vector(pdev, 0), ism);

include/net/smc.h

@@ -37,6 +37,8 @@ struct smcd_dmb {
 #define ISM_EVENT_GID	1
 #define ISM_EVENT_SWR	2
 
+#define ISM_RESERVED_VLANID	0x1FFF
+
 #define ISM_ERROR	0xFFFF
 
 struct smcd_event {
@@ -63,6 +65,8 @@ struct smcd_ops {
 	int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
 			 bool sf, unsigned int offset, void *data,
 			 unsigned int size);
+	void (*get_system_eid)(struct smcd_dev *dev, u8 **eid);
+	u16 (*get_chid)(struct smcd_dev *dev);
 };
 
 struct smcd_dev {