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Subject[net-next PATCH 2/8] octeontx2-pf: Add ethtool priv flag to control PAM4 on/off
Date
From: Felix Manlunas <fmanlunas@marvell.com>

For PHYs that support changing modulation type (NRZ or PAM4), enable these
commands:

ethtool --set-priv-flags ethX pam4 on
ethtool --set-priv-flags ethX pam4 off # means NRZ modulation
ethtool --show-priv-flags ethX

Signed-off-by: Felix Manlunas <fmanlunas@marvell.com>
Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
---
.../marvell/octeontx2/nic/otx2_ethtool.c | 62 +++++++++++++++++++
1 file changed, 62 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index f4962a97a07..552ecae1dbe 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
@@ -22,6 +22,11 @@
#define DRV_NAME "octeontx2-nicpf"
#define DRV_VF_NAME "octeontx2-nicvf"

+static const char otx2_priv_flags_strings[][ETH_GSTRING_LEN] = {
+#define OTX2_PRIV_FLAGS_PAM4 BIT(0)
+ "pam4",
+};
+
struct otx2_stat {
char name[ETH_GSTRING_LEN];
unsigned int index;
@@ -112,6 +117,12 @@ static void otx2_get_strings(struct net_device *netdev, u32 sset, u8 *data)
struct otx2_nic *pfvf = netdev_priv(netdev);
int stats;

+ if (sset == ETH_SS_PRIV_FLAGS) {
+ memcpy(data, otx2_priv_flags_strings,
+ ARRAY_SIZE(otx2_priv_flags_strings) * ETH_GSTRING_LEN);
+ return;
+ }
+
if (sset != ETH_SS_STATS)
return;

@@ -250,6 +261,9 @@ static int otx2_get_sset_count(struct net_device *netdev, int sset)
struct otx2_nic *pfvf = netdev_priv(netdev);
int qstats_count;

+ if (sset == ETH_SS_PRIV_FLAGS)
+ return ARRAY_SIZE(otx2_priv_flags_strings);
+
if (sset != ETH_SS_STATS)
return -EINVAL;

@@ -1219,6 +1233,52 @@ static int otx2_set_link_ksettings(struct net_device *netdev,
return err;
}

+static int otx2_set_priv_flags(struct net_device *netdev, u32 priv_flags)
+{
+ struct otx2_nic *pfvf = netdev_priv(netdev);
+ struct cgx_phy_mod_type *req;
+ struct cgx_fw_data *fwd;
+ int rc = -ENOMEM;
+
+ fwd = otx2_get_fwdata(pfvf);
+ if (IS_ERR(fwd))
+ return PTR_ERR(fwd);
+
+ /* ret here if phy does not support this feature */
+ if (!fwd->fwdata.phy.misc.can_change_mod_type)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&pfvf->mbox.lock);
+ req = otx2_mbox_alloc_msg_cgx_set_phy_mod_type(&pfvf->mbox);
+ if (!req)
+ goto end;
+
+ req->mod = priv_flags & OTX2_PRIV_FLAGS_PAM4;
+ if (!otx2_sync_mbox_msg(&pfvf->mbox))
+ rc = 0;
+
+end:
+ mutex_unlock(&pfvf->mbox.lock);
+ return rc;
+}
+
+static u32 otx2_get_priv_flags(struct net_device *netdev)
+{
+ struct otx2_nic *pfvf = netdev_priv(netdev);
+ struct cgx_fw_data *rsp;
+ u32 priv_flags = 0;
+
+ rsp = otx2_get_fwdata(pfvf);
+
+ if (IS_ERR(rsp))
+ return 0;
+
+ if (rsp->fwdata.phy.misc.mod_type)
+ priv_flags |= OTX2_PRIV_FLAGS_PAM4;
+
+ return priv_flags;
+}
+
static const struct ethtool_ops otx2_ethtool_ops = {
.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
ETHTOOL_COALESCE_MAX_FRAMES,
@@ -1250,6 +1310,8 @@ static const struct ethtool_ops otx2_ethtool_ops = {
.set_fecparam = otx2_set_fecparam,
.get_link_ksettings = otx2_get_link_ksettings,
.set_link_ksettings = otx2_set_link_ksettings,
+ .set_priv_flags = otx2_set_priv_flags,
+ .get_priv_flags = otx2_get_priv_flags,
};

void otx2_set_ethtool_ops(struct net_device *netdev)
--
2.17.1
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