netdev - [Patch v2 net-next 7/7] octeontx2-pf: ethtool physical link configuration

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Date:   Wed, 27 Jan 2021 13:15:52 +0530
From:   Hariprasad Kelam <hkelam@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <sgoutham@...vell.com>,
        <lcherian@...vell.com>, <gakula@...vell.com>, <jerinj@...vell.com>,
        <sbhatta@...vell.com>, Christina Jacob <cjacob@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>
Subject: [Patch v2 net-next 7/7] octeontx2-pf: ethtool physical link configuration

From: Christina Jacob <cjacob@...vell.com>

Register set_link_ksetting callback with driver such that
link configurations parameters like advertised mode,speed, duplex
and autoneg can be configured.

below command
ethtool -s eth0 advertise 0x1 speed 10 duplex full autoneg on

Signed-off-by: Christina Jacob <cjacob@...vell.com>
Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
---
 .../ethernet/marvell/octeontx2/nic/otx2_ethtool.c  | 53 ++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index b99f4bb..395a00d 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
@@ -1178,6 +1178,58 @@ static int otx2_get_link_ksettings(struct net_device *netdev,
 	return 0;
 }
 
+static int otx2_set_link_ksettings(struct net_device *netdev,
+				   const struct ethtool_link_ksettings *cmd)
+{
+	struct otx2_nic *pf = netdev_priv(netdev);
+	struct ethtool_link_ksettings req_ks;
+	struct ethtool_link_ksettings cur_ks;
+	struct cgx_set_link_mode_req *req;
+	struct mbox *mbox = &pf->mbox;
+	int err = 0;
+
+	/* save requested link settings */
+	memcpy(&req_ks, cmd, sizeof(struct ethtool_link_ksettings));
+
+	memset(&cur_ks, 0, sizeof(struct ethtool_link_ksettings));
+
+	if (!ethtool_validate_speed(cmd->base.speed) ||
+	    !ethtool_validate_duplex(cmd->base.duplex))
+		return -EINVAL;
+
+	if (cmd->base.autoneg != AUTONEG_ENABLE &&
+	    cmd->base.autoneg != AUTONEG_DISABLE)
+		return -EINVAL;
+
+	otx2_get_link_ksettings(netdev, &cur_ks);
+
+	/* Check requested modes against supported modes by hardware */
+	if (!bitmap_subset(req_ks.link_modes.advertising,
+			   cur_ks.link_modes.supported,
+			   __ETHTOOL_LINK_MODE_MASK_NBITS))
+		return -EINVAL;
+
+	mutex_lock(&mbox->lock);
+	req = otx2_mbox_alloc_msg_cgx_set_link_mode(&pf->mbox);
+	if (!req) {
+		err = -ENOMEM;
+		goto end;
+	}
+
+	req->args.speed = req_ks.base.speed;
+	/* firmware expects 1 for half duplex and 0 for full duplex
+	 * hence inverting
+	 */
+	req->args.duplex = req_ks.base.duplex ^ 0x1;
+	req->args.an =  req_ks.base.autoneg;
+	req->args.mode   = *req_ks.link_modes.advertising;
+
+	err = otx2_sync_mbox_msg(&pf->mbox);
+end:
+	mutex_unlock(&mbox->lock);
+	return err;
+}
+
 static const struct ethtool_ops otx2_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES,
@@ -1208,6 +1260,7 @@ static const struct ethtool_ops otx2_ethtool_ops = {
 	.get_fecparam		= otx2_get_fecparam,
 	.set_fecparam		= otx2_set_fecparam,
 	.get_link_ksettings     = otx2_get_link_ksettings,
+	.set_link_ksettings     = otx2_set_link_ksettings,
 };
 
 void otx2_set_ethtool_ops(struct net_device *netdev)
-- 
2.7.4