[dpdk-dev] [PATCH] net/nfp: fix jumbo settings

[Alejandro Lucero]

When jumbo frames is configured, the hardware mtu needs to be updated to
the specified max_rx_pkt_len. Also, changing mtu should be avoided once
the PMD port started.

Fixes: defb9a5dd156 ("nfp: introduce driver initialization")

Signed-off-by: Alejandro Lucero <alejandro.luc...@netronome.com>
---
 drivers/net/nfp/nfp_net.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
index 9a7b0b2..e2cea06 100644
--- a/drivers/net/nfp/nfp_net.c
+++ b/drivers/net/nfp/nfp_net.c
@@ -489,7 +489,7 @@ enum nfp_qcp_ptr {
        }
 
        if (rxmode->jumbo_frame)
-               /* this is handled in rte_eth_dev_configure */
+               hw->mtu = rxmode->max_rx_pkt_len;
 
        if (rxmode->hw_strip_crc) {
                PMD_INIT_LOG(INFO, "strip CRC not supported");
@@ -1469,6 +1469,13 @@ enum nfp_qcp_ptr {
        if ((mtu < ETHER_MIN_MTU) || ((uint32_t)mtu > hw->max_mtu))
                return -EINVAL;
 
+       /* mtu setting is forbidden if port is started */
+       if (dev->data->dev_started) {
+               PMD_DRV_LOG(ERR, "port %d must be stopped before configuration",
+                           dev_data->port_id);
+               return -EBUSY;
+       }
+
        /* switch to jumbo mode if needed */
        if ((uint32_t)mtu > ETHER_MAX_LEN)
                dev->data->dev_conf.rxmode.jumbo_frame = 1;
-- 
1.9.1