linux-kernel - [RFC PATCH net-next 01/13] net/smc: improve SMC-D device dump for virtual ISM

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Message-Id: <1702214654-32069-2-git-send-email-guwen@linux.alibaba.com>
Date:   Sun, 10 Dec 2023 21:24:02 +0800
From:   Wen Gu <guwen@...ux.alibaba.com>
To:     wintera@...ux.ibm.com, wenjia@...ux.ibm.com, hca@...ux.ibm.com,
        gor@...ux.ibm.com, agordeev@...ux.ibm.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        kgraul@...ux.ibm.com, jaka@...ux.ibm.com
Cc:     borntraeger@...ux.ibm.com, svens@...ux.ibm.com,
        alibuda@...ux.alibaba.com, tonylu@...ux.alibaba.com,
        guwen@...ux.alibaba.com, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next 01/13] net/smc: improve SMC-D device dump for virtual ISM

The introduction of virtual ISM requires improvement of SMC-D device
dump. Software implemented non-PCI device (loopback-ism) should be
handled correctly and the CHID reserved for virtual ISM should be got
from smcd_ops interface instead of PCI information.

Signed-off-by: Wen Gu <guwen@...ux.alibaba.com>
---
 net/smc/smc_ism.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index ac88de2..66bcfdd 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -252,12 +252,11 @@ static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd,
 	char smc_pnet[SMC_MAX_PNETID_LEN + 1];
 	struct smc_pci_dev smc_pci_dev;
 	struct nlattr *port_attrs;
+	struct device *device;
 	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);
@@ -272,7 +271,15 @@ 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);
+	device = smcd->ops->get_dev(smcd);
+	if (device->parent)
+		smc_set_pci_values(to_pci_dev(device->parent), &smc_pci_dev);
+	if (smc_ism_is_virtual(smcd)) {
+		smc_pci_dev.pci_pchid = smc_ism_get_chid(smcd);
+		if (!device->parent)
+			snprintf(smc_pci_dev.pci_id, sizeof(smc_pci_dev.pci_id),
+				 "%s", dev_name(device));
+	}
 	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))
-- 
1.8.3.1