net/smc: introduce System Enterprise ID (SEID)

SMCD version 2 defines a System Enterprise ID (short SEID).
This patch contains the SEID creation and adds the callback to
retrieve the created SEID.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/s390/net/ism.h b/drivers/s390/net/ism.h
index 1901e9c..38fe90c 100644 (file)
--- a/drivers/s390/net/ism.h
+++ b/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)
 {

diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index 5fbe9ea..c452ea5 100644 (file)
--- a/drivers/s390/net/ism_drv.c
+++ b/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 +389,31 @@ 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 void ism_handle_event(struct ism_dev *ism)
 {
        struct smcd_event *entry;
@@ -443,6 +470,7 @@ 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,
 };
 
 static int ism_dev_init(struct ism_dev *ism)
@@ -471,6 +499,10 @@ 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 +582,9 @@ 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);

diff --git a/include/net/smc.h b/include/net/smc.h
index 646feb4..b28b384 100644 (file)
--- a/include/net/smc.h
+++ b/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 +65,7 @@ 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);
 };
 
 struct smcd_dev {

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index dc0049b..8c1cde3 100644 (file)
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -2137,6 +2137,8 @@ static int __init smc_init(void)
        if (rc)
                return rc;
 
+       smc_ism_init();
+
        rc = smc_pnet_init();
        if (rc)
                goto out_pernet_subsys;

diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index 998c525..63c3dd5 100644 (file)
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -21,7 +21,9 @@ struct smcd_dev_list smcd_dev_list = {
        .mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
 };
 
-/* Test if an ISM communication is possible. */
+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,
@@ -39,6 +41,11 @@ int smc_ism_write(struct smcd_dev *smcd, const struct smc_ism_position *pos,
        return rc < 0 ? rc : 0;
 }
 
+void smc_ism_get_system_eid(struct smcd_dev *smcd, u8 **eid)
+{
+       smcd->ops->get_system_eid(smcd, eid);
+}
+
 /* Set a connection using this DMBE. */
 void smc_ism_set_conn(struct smc_connection *conn)
 {
@@ -319,6 +326,13 @@ EXPORT_SYMBOL_GPL(smcd_alloc_dev);
 int smcd_register_dev(struct smcd_dev *smcd)
 {
        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;
+       }
        list_add_tail(&smcd->list, &smcd_dev_list.list);
        mutex_unlock(&smcd_dev_list.mutex);
 
@@ -399,3 +413,8 @@ void smcd_handle_irq(struct smcd_dev *smcd, unsigned int dmbno)
        spin_unlock_irqrestore(&smcd->lock, flags);
 }
 EXPORT_SYMBOL_GPL(smcd_handle_irq);
+
+void __init smc_ism_init(void)
+{
+       smc_ism_v2_capable = false;
+}

diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h
index 81cc453..816d863 100644 (file)
--- a/net/smc/smc_ism.h
+++ b/net/smc/smc_ism.h
@@ -19,7 +19,10 @@ struct smcd_dev_list {       /* List of SMCD devices */
        struct mutex mutex;     /* Protects list of devices */
 };
 
-extern struct smcd_dev_list    smcd_dev_list; /* list of smcd devices */
+extern struct smcd_dev_list    smcd_dev_list;  /* list of smcd devices */
+extern bool    smc_ism_v2_capable;     /* HW supports ISM V2 and thus
+                                        * System EID is defined
+                                        */
 
 struct smc_ism_vlanid {                        /* VLAN id set on ISM device */
        struct list_head list;
@@ -47,4 +50,6 @@ int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc);
 int smc_ism_write(struct smcd_dev *dev, const struct smc_ism_position *pos,
                  void *data, size_t len);
 int smc_ism_signal_shutdown(struct smc_link_group *lgr);
+void smc_ism_get_system_eid(struct smcd_dev *dev, u8 **eid);
+void smc_ism_init(void);
 #endif