net/smc: Separate SMC-D and ISM APIs

We separate the code implementing the struct smcd_ops API in the ISM
device driver from the functions that may be used by other exploiters of
ISM devices.
Note: We start out small, and don't offer the whole breadth of the ISM
device for public use, as many functions are specific to or likely only
ever used in the context of SMC-D.
This is the third part of a bigger overhaul of the interfaces between SMC
and ISM.

Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Signed-off-by: Jan Karcher <jaka@linux.ibm.com>
Signed-off-by: Wenjia Zhang <wenjia@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 63 insertions, 29 deletions

diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index f35c6077db04..e6c810a96b24 100644
--- a/drivers/s390/net/ism_drv.c
+++ b/drivers/s390/net/ism_drv.c
@@ -273,10 +273,9 @@ out:
 	return ret;
 }
 
-static int ism_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid,
+static int ism_query_rgid(struct ism_dev *ism, u64 rgid, u32 vid_valid,
 			  u32 vid)
 {
-	struct ism_dev *ism = smcd->priv;
 	union ism_query_rgid cmd;
 
 	memset(&cmd, 0, sizeof(cmd));
@@ -290,6 +289,11 @@ static int ism_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid,
 	return ism_cmd(ism, &cmd);
 }
 
+static int smcd_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid, u32 vid)
+{
+	return ism_query_rgid(smcd->priv, rgid, vid_valid, vid);
+}
+
 static void ism_free_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 {
 	clear_bit(dmb->sba_idx, ism->sba_bitmap);
@@ -326,9 +330,9 @@ static int ism_alloc_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 	return dmb->cpu_addr ? 0 : -ENOMEM;
 }
 
-static int ism_register_dmb(struct smcd_dev *smcd, struct ism_dmb *dmb)
+int ism_register_dmb(struct ism_dev *ism, struct ism_dmb *dmb,
+		     struct ism_client *client)
 {
-	struct ism_dev *ism = smcd->priv;
 	union ism_reg_dmb cmd;
 	int ret;
 
@@ -353,18 +357,19 @@ static int ism_register_dmb(struct smcd_dev *smcd, struct ism_dmb *dmb)
 		goto out;
 	}
 	dmb->dmb_tok = cmd.response.dmb_tok;
+	ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = client->id;
 out:
 	return ret;
 }
+EXPORT_SYMBOL_GPL(ism_register_dmb);
 
 static int smcd_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
 {
-	return ism_register_dmb(smcd, (struct ism_dmb *)dmb);
+	return ism_register_dmb(smcd->priv, (struct ism_dmb *)dmb, NULL);
 }
 
-static int ism_unregister_dmb(struct smcd_dev *smcd, struct ism_dmb *dmb)
+int ism_unregister_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 {
-	struct ism_dev *ism = smcd->priv;
 	union ism_unreg_dmb cmd;
 	int ret;
 
@@ -374,6 +379,8 @@ static int ism_unregister_dmb(struct smcd_dev *smcd, struct ism_dmb *dmb)
 
 	cmd.request.dmb_tok = dmb->dmb_tok;
 
+	ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = NO_CLIENT;
+
 	ret = ism_cmd(ism, &cmd);
 	if (ret && ret != ISM_ERROR)
 		goto out;
@@ -382,15 +389,15 @@ static int ism_unregister_dmb(struct smcd_dev *smcd, struct ism_dmb *dmb)
 out:
 	return ret;
 }
+EXPORT_SYMBOL_GPL(ism_unregister_dmb);
 
 static int smcd_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
 {
-	return ism_unregister_dmb(smcd, (struct ism_dmb *)dmb);
+	return ism_unregister_dmb(smcd->priv, (struct ism_dmb *)dmb);
 }
 
-static int ism_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
+static int ism_add_vlan_id(struct ism_dev *ism, u64 vlan_id)
 {
-	struct ism_dev *ism = smcd->priv;
 	union ism_set_vlan_id cmd;
 
 	memset(&cmd, 0, sizeof(cmd));
@@ -402,9 +409,13 @@ static int ism_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
 	return ism_cmd(ism, &cmd);
 }
 
-static int ism_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
+static int smcd_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
+{
+	return ism_add_vlan_id(smcd->priv, vlan_id);
+}
+
+static int ism_del_vlan_id(struct ism_dev *ism, u64 vlan_id)
 {
-	struct ism_dev *ism = smcd->priv;
 	union ism_set_vlan_id cmd;
 
 	memset(&cmd, 0, sizeof(cmd));
@@ -416,6 +427,11 @@ static int ism_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
 	return ism_cmd(ism, &cmd);
 }
 
+static int smcd_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
+{
+	return ism_del_vlan_id(smcd->priv, vlan_id);
+}
+
 static int ism_set_vlan_required(struct smcd_dev *smcd)
 {
 	return ism_cmd_simple(smcd->priv, ISM_SET_VLAN);
@@ -426,8 +442,8 @@ static int ism_reset_vlan_required(struct smcd_dev *smcd)
 	return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN);
 }
 
-static int ism_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq,
-			  u32 event_code, u64 info)
+static int smcd_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq,
+			   u32 event_code, u64 info)
 {
 	struct ism_dev *ism = smcd->priv;
 	union ism_sig_ieq cmd;
@@ -450,8 +466,9 @@ static unsigned int max_bytes(unsigned int start, unsigned int len,
 	return min(boundary - (start & (boundary - 1)), len);
 }
 
-static int ism_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
-		    bool sf, unsigned int offset, void *data, unsigned int size)
+static int smcd_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
+		     bool sf, unsigned int offset, void *data,
+		     unsigned int size)
 {
 	struct ism_dev *ism = smcd->priv;
 	unsigned int bytes;
@@ -495,14 +512,15 @@ static void ism_create_system_eid(void)
 	memcpy(&SYSTEM_EID.type, tmp, 4);
 }
 
-static u8 *ism_get_system_eid(void)
+u8 *ism_get_seid(void)
 {
 	return SYSTEM_EID.seid_string;
 }
+EXPORT_SYMBOL_GPL(ism_get_seid);
 
-static u16 ism_get_chid(struct smcd_dev *smcd)
+static u16 smcd_get_chid(struct smcd_dev *smcd)
 {
-	struct ism_dev *ism = (struct ism_dev *)smcd->priv;
+	struct ism_dev *ism = smcd->priv;
 
 	if (!ism || !ism->pdev)
 		return 0;
@@ -565,18 +583,26 @@ static irqreturn_t ism_handle_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static u64 smcd_get_local_gid(struct smcd_dev *smcd)
+{
+	struct ism_dev *ism = smcd->priv;
+
+	return ism->local_gid;
+}
+
 static const struct smcd_ops ism_ops = {
-	.query_remote_gid = ism_query_rgid,
+	.query_remote_gid = smcd_query_rgid,
 	.register_dmb = smcd_register_dmb,
 	.unregister_dmb = smcd_unregister_dmb,
-	.add_vlan_id = ism_add_vlan_id,
-	.del_vlan_id = ism_del_vlan_id,
+	.add_vlan_id = smcd_add_vlan_id,
+	.del_vlan_id = smcd_del_vlan_id,
 	.set_vlan_required = ism_set_vlan_required,
 	.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,
+	.signal_event = smcd_signal_ieq,
+	.move_data = smcd_move,
+	.get_system_eid = ism_get_seid,
+	.get_local_gid = smcd_get_local_gid,
+	.get_chid = smcd_get_chid,
 };
 
 static void ism_dev_add_work_func(struct work_struct *work)
@@ -599,10 +625,15 @@ static int ism_dev_init(struct ism_dev *ism)
 	if (ret <= 0)
 		goto out;
 
+	ism->sba_client_arr = kzalloc(ISM_NR_DMBS, GFP_KERNEL);
+	if (!ism->sba_client_arr)
+		goto free_vectors;
+	memset(ism->sba_client_arr, NO_CLIENT, ISM_NR_DMBS);
+
 	ret = request_irq(pci_irq_vector(pdev, 0), ism_handle_irq, 0,
 			  pci_name(pdev), ism);
 	if (ret)
-		goto free_vectors;
+		goto free_client_arr;
 
 	ret = register_sba(ism);
 	if (ret)
@@ -616,7 +647,7 @@ static int ism_dev_init(struct ism_dev *ism)
 	if (ret)
 		goto unreg_ieq;
 
-	if (!ism_add_vlan_id(ism->smcd, ISM_RESERVED_VLANID))
+	if (!ism_add_vlan_id(ism, ISM_RESERVED_VLANID))
 		/* hardware is V2 capable */
 		ism_create_system_eid();
 
@@ -651,6 +682,8 @@ unreg_sba:
 	unregister_sba(ism);
 free_irq:
 	free_irq(pci_irq_vector(pdev, 0), ism);
+free_client_arr:
+	kfree(ism->sba_client_arr);
 free_vectors:
 	pci_free_irq_vectors(pdev);
 out:
@@ -746,10 +779,11 @@ static void ism_dev_exit(struct ism_dev *ism)
 
 	if (SYSTEM_EID.serial_number[0] != '0' ||
 	    SYSTEM_EID.type[0] != '0')
-		ism_del_vlan_id(ism->smcd, ISM_RESERVED_VLANID);
+		ism_del_vlan_id(ism, ISM_RESERVED_VLANID);
 	unregister_ieq(ism);
 	unregister_sba(ism);
 	free_irq(pci_irq_vector(pdev, 0), ism);
+	kfree(ism->sba_client_arr);
 	pci_free_irq_vectors(pdev);
 	list_del_init(&ism->list);
 }