netdev - [PATCH 1/2] net/ncsi: add NCSI Intel OEM command to keep PHY up

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Date:   Fri, 2 Jul 2021 14:25:18 +0300
From:   Ivan Mikhaylov <i.mikhaylov@...ro.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Samuel Mendoza-Jonas <sam@...dozajonas.com>
CC:     Ivan Mikhaylov <i.mikhaylov@...ro.com>,
        Joel Stanley <joel@....id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <openbmc@...ts.ozlabs.org>
Subject: [PATCH 1/2] net/ncsi: add NCSI Intel OEM command to keep PHY up

This allows to keep PHY link up and prevents any channel resets during
the host load. On BMC it prevents channel reconfiguration:

eth1: NCSI: No channel with link found, configuring channel 0

which brings problem with BMC accessibility.

It is KEEP_PHY_LINK_UP option(Veto bit) in i210 datasheet which
blocks PHY reset and power state changes.

Signed-off-by: Ivan Mikhaylov <i.mikhaylov@...ro.com>
---
 net/ncsi/Kconfig       |  6 ++++++
 net/ncsi/internal.h    |  5 +++++
 net/ncsi/ncsi-manage.c | 48 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+)

diff --git a/net/ncsi/Kconfig b/net/ncsi/Kconfig
index 93309081f5a4..ea1dd32b6b1f 100644
--- a/net/ncsi/Kconfig
+++ b/net/ncsi/Kconfig
@@ -17,3 +17,9 @@ config NCSI_OEM_CMD_GET_MAC
 	help
 	  This allows to get MAC address from NCSI firmware and set them back to
 		controller.
+config NCSI_OEM_CMD_KEEP_PHY
+	bool "Keep PHY Link up"
+	depends on NET_NCSI
+	help
+	  This allows to keep PHY link up and prevents any channel resets during
+	  the host load.
diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h
index 49031f804276..0a232f3eb343 100644
--- a/net/ncsi/internal.h
+++ b/net/ncsi/internal.h
@@ -78,6 +78,9 @@ enum {
 /* OEM Vendor Manufacture ID */
 #define NCSI_OEM_MFR_MLX_ID             0x8119
 #define NCSI_OEM_MFR_BCM_ID             0x113d
+#define NCSI_OEM_MFR_INL_ID             0x157
+/* Intel specific OEM command */
+#define NCSI_OEM_INL_CMD_KEEP_PHY       0x20   /* CMD ID for Keep PHY up */
 /* Broadcom specific OEM Command */
 #define NCSI_OEM_BCM_CMD_GMA            0x01   /* CMD ID for Get MAC */
 /* Mellanox specific OEM Command */
@@ -86,6 +89,7 @@ enum {
 #define NCSI_OEM_MLX_CMD_SMAF           0x01   /* CMD ID for Set MC Affinity */
 #define NCSI_OEM_MLX_CMD_SMAF_PARAM     0x07   /* Parameter for SMAF         */
 /* OEM Command payload lengths*/
+#define NCSI_OEM_INL_CMD_KEEP_PHY_LEN   7
 #define NCSI_OEM_BCM_CMD_GMA_LEN        12
 #define NCSI_OEM_MLX_CMD_GMA_LEN        8
 #define NCSI_OEM_MLX_CMD_SMAF_LEN        60
@@ -270,6 +274,7 @@ enum {
 	ncsi_dev_state_probe_channel,
 	ncsi_dev_state_probe_mlx_gma,
 	ncsi_dev_state_probe_mlx_smaf,
+	ncsi_dev_state_probe_keep_phy,
 	ncsi_dev_state_probe_cis,
 	ncsi_dev_state_probe_gvi,
 	ncsi_dev_state_probe_gc,
diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index ffff8da707b8..d78cca2a2b26 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -689,6 +689,37 @@ static int set_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
 	return 0;
 }
 
+#if IS_ENABLED(CONFIG_NCSI_OEM_CMD_KEEP_PHY)
+
+static int ncsi_oem_keep_phy_inl(struct ncsi_cmd_arg *nca)
+{
+	unsigned char data[NCSI_OEM_INL_CMD_KEEP_PHY_LEN];
+	int ret = 0;
+
+	nca->payload = NCSI_OEM_INL_CMD_KEEP_PHY_LEN;
+
+	memset(data, 0, NCSI_OEM_INL_CMD_KEEP_PHY_LEN);
+	*(unsigned int *)data = ntohl(NCSI_OEM_MFR_INL_ID);
+
+	/* Predefined data */
+	data[4] = NCSI_OEM_INL_CMD_KEEP_PHY;
+	data[5] = 0x0;
+
+	/* PHY Link up attribute */
+	data[6] = 0x1;
+
+	nca->data = data;
+
+	ret = ncsi_xmit_cmd(nca);
+	if (ret)
+		netdev_err(nca->ndp->ndev.dev,
+			   "NCSI: Failed to transmit cmd 0x%x during configure\n",
+			   nca->type);
+	return ret;
+}
+
+#endif
+
 #if IS_ENABLED(CONFIG_NCSI_OEM_CMD_GET_MAC)
 
 /* NCSI OEM Command APIs */
@@ -1350,8 +1381,25 @@ static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
 		    ndp->mlx_multi_host)
 			nd->state = ncsi_dev_state_probe_mlx_gma;
 
+		if (IS_ENABLED(CONFIG_NCSI_OEM_CMD_KEEP_PHY))
+			nd->state = ncsi_dev_state_probe_keep_phy;
+
 		schedule_work(&ndp->work);
 		break;
+#if IS_ENABLED(CONFIG_NCSI_OEM_CMD_KEEP_PHY)
+	case ncsi_dev_state_probe_keep_phy:
+		ndp->pending_req_num = 1;
+
+		nca.type = NCSI_PKT_CMD_OEM;
+		nca.package = ndp->active_package->id;
+		nca.channel = 0;
+		ret = ncsi_oem_keep_phy_inl(&nca);
+		if (ret)
+			goto error;
+
+		nd->state = ncsi_dev_state_probe_cis;
+		break;
+#endif /* CONFIG_NCSI_OEM_CMD_KEEP_PHY */
 #if IS_ENABLED(CONFIG_NCSI_OEM_CMD_GET_MAC)
 	case ncsi_dev_state_probe_mlx_gma:
 		ndp->pending_req_num = 1;
-- 
2.31.1