[PATCH net-next 1/2] net/smc: Introduce explicit check for v2 support

Wenjia Zhang
2023-03-13T10:28:55Z

From: Stefan Raspl <raspl@linux.ibm.com>

Previously, v2 support was derived from a very specific format of the SEID
as part of the SMC-D codebase. Make this part of the SMC-D device API, so
implementers do not need to adhere to a specific SEID format.

Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Reviewed-and-tested-by: Jan Karcher <jaka@linux.ibm.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Signed-off-by: Wenjia Zhang <wenjia@linux.ibm.com>
---
drivers/s390/net/ism_drv.c | 7 +++++++
include/net/smc.h | 1 +
net/smc/smc_ism.c | 2 +-
3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index eb7e13486087..1c73d32966f1 100644
--- a/drivers/s390/net/ism_drv.c
+++ b/drivers/s390/net/ism_drv.c
@@ -842,6 +842,12 @@ static int smcd_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
return ism_move(smcd->priv, dmb_tok, idx, sf, offset, data, size);
}

+static int smcd_supports_v2(void)
+{
+ return SYSTEM_EID.serial_number[0] != '0' ||
+ SYSTEM_EID.type[0] != '0';
+}
+
static u64 smcd_get_local_gid(struct smcd_dev *smcd)
{
return ism_get_local_gid(smcd->priv);
@@ -869,6 +875,7 @@ static const struct smcd_ops ism_ops = {
.reset_vlan_required = smcd_reset_vlan_required,
.signal_event = smcd_signal_ieq,
.move_data = smcd_move,
+ .supports_v2 = smcd_supports_v2,
.get_system_eid = ism_get_seid,
.get_local_gid = smcd_get_local_gid,
.get_chid = smcd_get_chid,
diff --git a/include/net/smc.h b/include/net/smc.h
index 597cb9381182..a002552be29c 100644
--- a/include/net/smc.h
+++ b/include/net/smc.h
@@ -67,6 +67,7 @@ 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);
+ int (*supports_v2)(void);
u8* (*get_system_eid)(void);
u64 (*get_local_gid)(struct smcd_dev *dev);
u16 (*get_chid)(struct smcd_dev *dev);
diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index 3b0b7710c6b0..fbee2493091f 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -429,7 +429,7 @@ static void smcd_register_dev(struct ism_dev *ism)
u8 *system_eid = NULL;

system_eid = smcd->ops->get_system_eid();
- if (system_eid[24] != '0' || system_eid[28] != '0') {
+ if (smcd->ops->supports_v2()) {
smc_ism_v2_capable = true;
memcpy(smc_ism_v2_system_eid, system_eid,
SMC_MAX_EID_LEN);
--
2.37.2