[PATCH net-next 06/14] net/smc: introduce System Enterprise ID (SEID)

Karsten Graul
2020-09-26T10:44:54Z

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>
---
drivers/s390/net/ism.h | 7 +++++++
drivers/s390/net/ism_drv.c | 35 +++++++++++++++++++++++++++++++++++
include/net/smc.h | 3 +++
net/smc/af_smc.c | 2 ++
net/smc/smc_ism.c | 21 ++++++++++++++++++++-
net/smc/smc_ism.h | 7 ++++++-
6 files changed, 73 insertions(+), 2 deletions(-)

diff --git a/drivers/s390/net/ism.h b/drivers/s390/net/ism.h
index 1901e9c80ed8..38fe90c2597d 100644
--- 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 5fbe9eae84d1..c452ea5d9c8a 100644
--- 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 646feb4bc75f..b28b384d0625 100644
--- 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 dc0049b25bd9..8c1cde36adb8 100644
--- 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 998c525de785..63c3dd5578bf 100644
--- 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 81cc4537efd3..816d86361e1a 100644
--- 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
--
2.17.1