netdev - [RFC PATCH net-next v4 1/9] net/smc: Decouple ism

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Date:   Mon, 27 Mar 2023 11:28:11 +0800
From:   Wen Gu <guwen@...ux.alibaba.com>
To:     kgraul@...ux.ibm.com, wenjia@...ux.ibm.com, jaka@...ux.ibm.com,
        wintera@...ux.ibm.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com
Cc:     linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next v4 1/9] net/smc: Decouple ism_dev from SMC-D device dump

This patch helps to decouple SMC-D device and ISM device, allowing
different underlying device forms, such as non-PCI devices.

Signed-off-by: Wen Gu <guwen@...ux.alibaba.com>
---
 include/net/smc.h | 1 +
 net/smc/smc_ism.c | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/net/smc.h b/include/net/smc.h
index a002552..963ce9c 100644
--- a/include/net/smc.h
+++ b/include/net/smc.h
@@ -77,6 +77,7 @@ struct smcd_ops {
 struct smcd_dev {
 	const struct smcd_ops *ops;
 	void *priv;
+	struct device *parent_pci_dev;
 	struct list_head list;
 	spinlock_t lock;
 	struct smc_connection **conn;
diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index fbee249..4249fb9 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -231,11 +231,9 @@ static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd,
 	struct smc_pci_dev smc_pci_dev;
 	struct nlattr *port_attrs;
 	struct nlattr *attrs;
-	struct ism_dev *ism;
 	int use_cnt = 0;
 	void *nlh;
 
-	ism = smcd->priv;
 	nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 			  &smc_gen_nl_family, NLM_F_MULTI,
 			  SMC_NETLINK_GET_DEV_SMCD);
@@ -250,7 +248,8 @@ static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd,
 	if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, use_cnt > 0))
 		goto errattr;
 	memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
-	smc_set_pci_values(to_pci_dev(ism->dev.parent), &smc_pci_dev);
+	if (smcd->parent_pci_dev)
+		smc_set_pci_values(to_pci_dev(smcd->parent_pci_dev), &smc_pci_dev);
 	if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev.pci_fid))
 		goto errattr;
 	if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev.pci_pchid))
@@ -420,6 +419,7 @@ static void smcd_register_dev(struct ism_dev *ism)
 	if (!smcd)
 		return;
 	smcd->priv = ism;
+	smcd->parent_pci_dev = ism->dev.parent;
 	ism_set_priv(ism, &smc_ism_client, smcd);
 	if (smc_pnetid_by_dev_port(&ism->pdev->dev, 0, smcd->pnetid))
 		smc_pnetid_by_table_smcd(smcd);
-- 
1.8.3.1