[dpdk-dev] [PATCH v2 56/57] net/octeontx2: add MTU set operation

[<jerinj@marvell.com>]

From: Vamsi Attunuru <vattunuru@marvell.com>

Add MTU set operation and MTU update feature.

Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
---
 doc/guides/nics/features/octeontx2.ini     |  1 +
 doc/guides/nics/features/octeontx2_vec.ini |  1 +
 doc/guides/nics/octeontx2.rst              |  1 +
 drivers/net/octeontx2/otx2_ethdev.c        |  7 ++
 drivers/net/octeontx2/otx2_ethdev.h        |  4 +
 drivers/net/octeontx2/otx2_ethdev_ops.c    | 86 ++++++++++++++++++++++
 6 files changed, 100 insertions(+)

diff --git a/doc/guides/nics/features/octeontx2.ini b/doc/guides/nics/features/octeontx2.ini
index 1856d9924..be10dc0c8 100644
--- a/doc/guides/nics/features/octeontx2.ini
+++ b/doc/guides/nics/features/octeontx2.ini
@@ -15,6 +15,7 @@ Runtime Tx queue setup = Y
 Fast mbuf free       = Y
 Free Tx mbuf on demand = Y
 Queue start/stop     = Y
+MTU update           = Y
 Promiscuous mode     = Y
 Allmulticast mode    = Y
 Unicast MAC filter   = Y
diff --git a/doc/guides/nics/features/octeontx2_vec.ini b/doc/guides/nics/features/octeontx2_vec.ini
index 053fca288..df8180f83 100644
--- a/doc/guides/nics/features/octeontx2_vec.ini
+++ b/doc/guides/nics/features/octeontx2_vec.ini
@@ -15,6 +15,7 @@ Runtime Tx queue setup = Y
 Fast mbuf free       = Y
 Free Tx mbuf on demand = Y
 Queue start/stop     = Y
+MTU update           = Y
 Promiscuous mode     = Y
 Allmulticast mode    = Y
 Unicast MAC filter   = Y
diff --git a/doc/guides/nics/octeontx2.rst b/doc/guides/nics/octeontx2.rst
index d4a458262..517e9e641 100644
--- a/doc/guides/nics/octeontx2.rst
+++ b/doc/guides/nics/octeontx2.rst
@@ -30,6 +30,7 @@ Features of the OCTEON TX2 Ethdev PMD are:
 - Port hardware statistics
 - Link state information
 - Link flow control
+- MTU update
 - Scatter-Gather IO support
 - Vector Poll mode driver
 - Debug utilities - Context dump and error interrupt support
diff --git a/drivers/net/octeontx2/otx2_ethdev.c b/drivers/net/octeontx2/otx2_ethdev.c
index e23bed603..170593e95 100644
--- a/drivers/net/octeontx2/otx2_ethdev.c
+++ b/drivers/net/octeontx2/otx2_ethdev.c
@@ -1457,6 +1457,12 @@ otx2_nix_dev_start(struct rte_eth_dev *eth_dev)
 	struct otx2_eth_dev *dev = otx2_eth_pmd_priv(eth_dev);
 	int rc, i;
 
+	if (eth_dev->data->nb_rx_queues != 0) {
+		rc = otx2_nix_recalc_mtu(eth_dev);
+		if (rc)
+			return rc;
+	}
+
 	/* Start rx queues */
 	for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 		rc = otx2_nix_rx_queue_start(eth_dev, i);
@@ -1527,6 +1533,7 @@ static const struct eth_dev_ops otx2_eth_dev_ops = {
 	.stats_get                = otx2_nix_dev_stats_get,
 	.stats_reset              = otx2_nix_dev_stats_reset,
 	.get_reg                  = otx2_nix_dev_get_reg,
+	.mtu_set                  = otx2_nix_mtu_set,
 	.mac_addr_add             = otx2_nix_mac_addr_add,
 	.mac_addr_remove          = otx2_nix_mac_addr_del,
 	.mac_addr_set             = otx2_nix_mac_addr_set,
diff --git a/drivers/net/octeontx2/otx2_ethdev.h b/drivers/net/octeontx2/otx2_ethdev.h
index f39fdfa1f..3703acc69 100644
--- a/drivers/net/octeontx2/otx2_ethdev.h
+++ b/drivers/net/octeontx2/otx2_ethdev.h
@@ -371,6 +371,10 @@ int otx2_nix_tx_queue_start(struct rte_eth_dev *eth_dev, uint16_t qidx);
 int otx2_nix_tx_queue_stop(struct rte_eth_dev *eth_dev, uint16_t qidx);
 uint64_t otx2_nix_rxq_mbuf_setup(struct otx2_eth_dev *dev, uint16_t port_id);
 
+/* MTU */
+int otx2_nix_mtu_set(struct rte_eth_dev *eth_dev, uint16_t mtu);
+int otx2_nix_recalc_mtu(struct rte_eth_dev *eth_dev);
+
 /* Link */
 void otx2_nix_toggle_flag_link_cfg(struct otx2_eth_dev *dev, bool set);
 int otx2_nix_link_update(struct rte_eth_dev *eth_dev, int wait_to_complete);
diff --git a/drivers/net/octeontx2/otx2_ethdev_ops.c b/drivers/net/octeontx2/otx2_ethdev_ops.c
index 6a3048336..5a16a3c04 100644
--- a/drivers/net/octeontx2/otx2_ethdev_ops.c
+++ b/drivers/net/octeontx2/otx2_ethdev_ops.c
@@ -6,6 +6,92 @@
 
 #include "otx2_ethdev.h"
 
+int
+otx2_nix_mtu_set(struct rte_eth_dev *eth_dev, uint16_t mtu)
+{
+	uint32_t buffsz, frame_size = mtu + NIX_L2_OVERHEAD;
+	struct otx2_eth_dev *dev = otx2_eth_pmd_priv(eth_dev);
+	struct rte_eth_dev_data *data = eth_dev->data;
+	struct otx2_mbox *mbox = dev->mbox;
+	struct nix_frs_cfg *req;
+	int rc;
+
+	/* Check if MTU is within the allowed range */
+	if (frame_size < NIX_MIN_FRS || frame_size > NIX_MAX_FRS)
+		return -EINVAL;
+
+	buffsz = data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM;
+
+	/* Refuse MTU that requires the support of scattered packets
+	 * when this feature has not been enabled before.
+	 */
+	if (data->dev_started && frame_size > buffsz &&
+	    !(dev->rx_offloads & DEV_RX_OFFLOAD_SCATTER))
+		return -EINVAL;
+
+	/* Check <seg size> * <max_seg>  >= max_frame */
+	if ((dev->rx_offloads & DEV_RX_OFFLOAD_SCATTER)	&&
+	    (frame_size > buffsz * NIX_RX_NB_SEG_MAX))
+		return -EINVAL;
+
+	req = otx2_mbox_alloc_msg_nix_set_hw_frs(mbox);
+	req->update_smq = true;
+	/* FRS HW config should exclude FCS but include NPC VTAG insert size */
+	req->maxlen = frame_size - RTE_ETHER_CRC_LEN + NIX_MAX_VTAG_ACT_SIZE;
+
+	rc = otx2_mbox_process(mbox);
+	if (rc)
+		return rc;
+
+	/* Now just update Rx MAXLEN */
+	req = otx2_mbox_alloc_msg_nix_set_hw_frs(mbox);
+	req->maxlen = frame_size - RTE_ETHER_CRC_LEN;
+
+	rc = otx2_mbox_process(mbox);
+	if (rc)
+		return rc;
+
+	if (frame_size > RTE_ETHER_MAX_LEN)
+		dev->rx_offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;
+	else
+		dev->rx_offloads &= ~DEV_RX_OFFLOAD_JUMBO_FRAME;
+
+	/* Update max_rx_pkt_len */
+	data->dev_conf.rxmode.max_rx_pkt_len = frame_size;
+
+	return rc;
+}
+
+int
+otx2_nix_recalc_mtu(struct rte_eth_dev *eth_dev)
+{
+	struct otx2_eth_dev *dev = otx2_eth_pmd_priv(eth_dev);
+	struct rte_eth_dev_data *data = eth_dev->data;
+	struct rte_pktmbuf_pool_private *mbp_priv;
+	struct otx2_eth_rxq *rxq;
+	uint32_t buffsz;
+	uint16_t mtu;
+	int rc;
+
+	/* Get rx buffer size */
+	rxq = data->rx_queues[0];
+	mbp_priv = rte_mempool_get_priv(rxq->pool);
+	buffsz = mbp_priv->mbuf_data_room_size - RTE_PKTMBUF_HEADROOM;
+
+	/* Setup scatter mode if needed by jumbo */
+	if (data->dev_conf.rxmode.max_rx_pkt_len > buffsz)
+		dev->rx_offloads |= DEV_RX_OFFLOAD_SCATTER;
+
+	/* Setup MTU based on max_rx_pkt_len */
+	mtu = data->dev_conf.rxmode.max_rx_pkt_len - NIX_L2_OVERHEAD;
+
+	rc = otx2_nix_mtu_set(eth_dev, mtu);
+	if (rc)
+		otx2_err("Failed to set default MTU size %d", rc);
+
+	return rc;
+}
+
 static void
 nix_cgx_promisc_config(struct rte_eth_dev *eth_dev, int en)
 {
-- 
2.21.0