linux-kernel - [PATCH v1 1/1] net/ncsi: specify maximum package to probe

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Message-Id: <20240701154336.3536924-1-peteryin.openbmc@gmail.com>
Date: Mon,  1 Jul 2024 23:43:36 +0800
From: Peter Yin <peteryin.openbmc@...il.com>
To: patrick@...cx.xyz,
	amithash@...a.com,
	Samuel Mendoza-Jonas <sam@...dozajonas.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: cosmo.chou@...ntatw.com
Subject: [PATCH v1 1/1] net/ncsi: specify maximum package to probe

Most NICs have a single package. For OCP3.0 NICs, the package ID is
determined by the slot ID. Probing all 8 package IDs is usually
unnecessary. To reduce probe time, add properties to specify the
maximum number of packages.

Signed-off-by: Cosmo Chou <cosmo.chou@...ntatw.com>
Signed-off-by: Peter Yin <peteryin.openbmc@...il.com>
---
 net/ncsi/internal.h    |  1 +
 net/ncsi/ncsi-manage.c | 16 ++++++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h
index ef0f8f73826f..bd7ad0bf803f 100644
--- a/net/ncsi/internal.h
+++ b/net/ncsi/internal.h
@@ -341,6 +341,7 @@ struct ncsi_dev_priv {
 #define NCSI_MAX_VLAN_VIDS	15
 	struct list_head    vlan_vids;       /* List of active VLAN IDs */
 
+	unsigned int        max_package;     /* Num of packages to probe   */
 	bool                multi_package;   /* Enable multiple packages   */
 	bool                mlx_multi_host;  /* Enable multi host Mellanox */
 	u32                 package_whitelist; /* Packages to configure    */
diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index 5ecf611c8820..159943ee1317 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -1358,12 +1358,12 @@ static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
 		nd->state = ncsi_dev_state_probe_deselect;
 		fallthrough;
 	case ncsi_dev_state_probe_deselect:
-		ndp->pending_req_num = 8;
+		ndp->pending_req_num = ndp->max_package;
 
 		/* Deselect all possible packages */
 		nca.type = NCSI_PKT_CMD_DP;
 		nca.channel = NCSI_RESERVED_CHANNEL;
-		for (index = 0; index < 8; index++) {
+		for (index = 0; index < ndp->max_package; index++) {
 			nca.package = index;
 			ret = ncsi_xmit_cmd(&nca);
 			if (ret)
@@ -1491,7 +1491,7 @@ static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
 
 		/* Probe next package */
 		ndp->package_probe_id++;
-		if (ndp->package_probe_id >= 8) {
+		if (ndp->package_probe_id >= ndp->max_package) {
 			/* Probe finished */
 			ndp->flags |= NCSI_DEV_PROBED;
 			break;
@@ -1746,7 +1746,7 @@ struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
 	struct platform_device *pdev;
 	struct device_node *np;
 	unsigned long flags;
-	int i;
+	int i, ret;
 
 	/* Check if the device has been registered or not */
 	nd = ncsi_find_dev(dev);
@@ -1795,6 +1795,14 @@ struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
 		if (np && (of_property_read_bool(np, "mellanox,multi-host") ||
 			   of_property_read_bool(np, "mlx,multi-host")))
 			ndp->mlx_multi_host = true;
+
+		if (np) {
+			ret = of_property_read_u32(np, "ncsi-package",
+						   &ndp->max_package);
+			if (ret || !ndp->max_package ||
+			    ndp->max_package > NCSI_MAX_PACKAGE)
+				ndp->max_package = NCSI_MAX_PACKAGE;
+		}
 	}
 
 	return nd;
-- 
2.25.1