net/smc: Introduce explicit check for v2 support

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>
Reviewed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index eb7e134..1c73d32 100644 (file)
--- 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 597cb93..a002552 100644 (file)
--- 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 3b0b771..fbee249 100644 (file)
--- 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);