[dpdk-dev] [PATCH v3 36/46] net/liquidio: add API to validate VF MTU

[Shijith Thotton]

Signed-off-by: Shijith Thotton <shijith.thot...@caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.ja...@caviumnetworks.com>
Signed-off-by: Derek Chickles <derek.chick...@caviumnetworks.com>
Signed-off-by: Venkat Koppula <venkat.kopp...@caviumnetworks.com>
Signed-off-by: Srisivasubramanian S <ssriniva...@caviumnetworks.com>
Signed-off-by: Mallesham Jatharakonda <mjatharako...@oneconvergence.com>
---
 drivers/net/liquidio/lio_ethdev.c | 46 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/net/liquidio/lio_ethdev.c 
b/drivers/net/liquidio/lio_ethdev.c
index e2040b9..560f195 100644
--- a/drivers/net/liquidio/lio_ethdev.c
+++ b/drivers/net/liquidio/lio_ethdev.c
@@ -152,6 +152,33 @@
 }
 
 static int
+lio_dev_validate_vf_mtu(struct rte_eth_dev *eth_dev, uint16_t new_mtu)
+{
+       struct lio_device *lio_dev = LIO_DEV(eth_dev);
+
+       PMD_INIT_FUNC_TRACE();
+
+       if (!lio_dev->intf_open) {
+               lio_dev_err(lio_dev, "Port %d down, can't check MTU\n",
+                           lio_dev->port_id);
+               return -EINVAL;
+       }
+
+       /* Limit the MTU to make sure the ethernet packets are between
+        * ETHER_MIN_MTU bytes and PF's MTU
+        */
+       if ((new_mtu < ETHER_MIN_MTU) ||
+                       (new_mtu > lio_dev->linfo.link.s.mtu)) {
+               lio_dev_err(lio_dev, "Invalid MTU: %d\n", new_mtu);
+               lio_dev_err(lio_dev, "Valid range %d and %d\n",
+                           ETHER_MIN_MTU, lio_dev->linfo.link.s.mtu);
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
+static int
 lio_dev_rss_reta_update(struct rte_eth_dev *eth_dev,
                        struct rte_eth_rss_reta_entry64 *reta_conf,
                        uint16_t reta_size)
@@ -824,7 +851,9 @@
 static int
 lio_dev_start(struct rte_eth_dev *eth_dev)
 {
+       uint16_t mtu = eth_dev->data->dev_conf.rxmode.max_rx_pkt_len;
        struct lio_device *lio_dev = LIO_DEV(eth_dev);
+       uint16_t timeout = LIO_MAX_CMD_TIMEOUT;
        int ret = 0;
 
        lio_dev_info(lio_dev, "Starting port %d\n", eth_dev->data->port_id);
@@ -852,8 +881,25 @@
                goto dev_lsc_handle_error;
        }
 
+       while ((lio_dev->linfo.link.link_status64 == 0) && (--timeout))
+               rte_delay_ms(1);
+
+       if (lio_dev->linfo.link.link_status64 == 0) {
+               ret = -1;
+               goto dev_mtu_check_error;
+       }
+
+       if (lio_dev->linfo.link.s.mtu != mtu) {
+               ret = lio_dev_validate_vf_mtu(eth_dev, mtu);
+               if (ret)
+                       goto dev_mtu_check_error;
+       }
+
        return 0;
 
+dev_mtu_check_error:
+       rte_eal_alarm_cancel(lio_sync_link_state_check, eth_dev);
+
 dev_lsc_handle_error:
        lio_dev->intf_open = 0;
        lio_send_rx_ctrl_cmd(eth_dev, 0);
-- 
1.8.3.1