[PATCH v2 4/6] net/nfb: support setting RS-FEC mode

[spinler@cesnet.cz]

From: Martin Spinler <spinler@cesnet.cz>

Enable basic configuration of the RS-FEC link mode over MDIO.

Signed-off-by: Martin Spinler <spinler@cesnet.cz>
---
 doc/guides/rel_notes/release_26_03.rst |  2 +-
 drivers/net/nfb/nfb_ethdev.c           | 65 ++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 1 deletion(-)

diff --git a/doc/guides/rel_notes/release_26_03.rst b/doc/guides/rel_notes/release_26_03.rst
index 8a7e1010fb..ac76ac5b67 100644
--- a/doc/guides/rel_notes/release_26_03.rst
+++ b/doc/guides/rel_notes/release_26_03.rst
@@ -67,7 +67,7 @@ New Features
   * Report firmware version and correct Ethernet link speed.
   * Common CESNET-NDK-based adapters have been added,
     including the FB2CGHH (Silicom Denmark) and XpressSX AGI-FH400G (Reflex CES).
-  * Added support for configuration of the Link Up / Link Down state.
+  * Added support for configuration of the RS-FEC mode, Link Up / Link Down state.
 
 
 Removed Items
diff --git a/drivers/net/nfb/nfb_ethdev.c b/drivers/net/nfb/nfb_ethdev.c
index abb108a280..a556ceca67 100644
--- a/drivers/net/nfb/nfb_ethdev.c
+++ b/drivers/net/nfb/nfb_ethdev.c
@@ -601,6 +601,69 @@ nfb_eth_fw_version_get(struct rte_eth_dev *dev, char *fw_version,
 	return 0;
 }
 
+static int
+nfb_eth_fec_get(struct rte_eth_dev *dev, uint32_t *fec_capa)
+{
+	int reg;
+	struct pmd_internals *intl = dev->process_private;
+	struct mdio_if_info *if_info;
+
+	*fec_capa = 0;
+	if (!intl->max_eth)
+		return 0;
+
+	if_info = &intl->eth_node[0].if_info;
+
+	reg = nfb_mdio_if_read_pma(if_info, NFB_MDIO_PMA_RSFEC_CR);
+	if (reg < 0)
+		return -EIO;
+
+	*fec_capa = (reg & NFB_MDIO_PMA_RSFEC_CR_ENABLE) ?
+			RTE_ETH_FEC_MODE_CAPA_MASK(RS) :
+			RTE_ETH_FEC_MODE_CAPA_MASK(NOFEC);
+
+	return 0;
+}
+
+static int
+nfb_eth_fec_set(struct rte_eth_dev *dev, uint32_t fec_capa)
+{
+	int ret;
+	uint32_t fec_capa2 = 0;
+	int reg;
+
+	struct pmd_internals *intl = dev->process_private;
+	struct mdio_if_info *if_info;
+
+	if (!intl->max_eth)
+		return 0;
+
+	if_info = &intl->eth_node[0].if_info;
+
+	if (fec_capa & RTE_ETH_FEC_MODE_CAPA_MASK(AUTO))
+		return -EINVAL;
+
+	reg = nfb_mdio_if_read_pma(if_info, NFB_MDIO_PMA_RSFEC_CR);
+	if (reg < 0)
+		return -EIO;
+
+	reg = (fec_capa & RTE_ETH_FEC_MODE_CAPA_MASK(RS)) ?
+			(reg | NFB_MDIO_PMA_RSFEC_CR_ENABLE) :
+			(reg & ~NFB_MDIO_PMA_RSFEC_CR_ENABLE);
+	ret = nfb_mdio_if_write_pma(if_info, NFB_MDIO_PMA_RSFEC_CR, reg);
+	if (ret < 0)
+		return -EIO;
+
+	ret = nfb_eth_fec_get(dev, &fec_capa2);
+	if (ret)
+		return ret;
+
+	if (fec_capa != fec_capa2)
+		return -EINVAL;
+
+	return 0;
+}
+
 static const struct eth_dev_ops ops = {
 	.dev_start = nfb_eth_dev_start,
 	.dev_stop = nfb_eth_dev_stop,
@@ -628,6 +691,8 @@ static const struct eth_dev_ops ops = {
 	.mac_addr_add = nfb_eth_mac_addr_add,
 	.mac_addr_remove = nfb_eth_mac_addr_remove,
 	.fw_version_get = nfb_eth_fw_version_get,
+	.fec_get = nfb_eth_fec_get,
+	.fec_set = nfb_eth_fec_set,
 };
 
 /**
-- 
2.53.0