[dpdk-dev] [PATCH v2] app/testpmd: update Rx offload after setting MTU sccessfully

["Wei Hu (Xavier)" <huwei013@chinasoftinc.com>]

From: "Wei Hu (Xavier)" <xavier.huwei@huawei.com>

Currently, Rx offload capabilities and max_rx_pkt_len in the struct
variable named rte_port are not updated after setting mtu successfully
in port_mtu_set function by 'port config mtu <port_id> <value>' command.
This may lead to reconfig mtu to the initial value in the driver when
recalling rte_eth_dev_configure API interface.

This patch updates Rx offload capabilities and max_rx_pkt_len after
setting mtu successfully when configuring mtu.

Fixes: ae03d0d18adf ("app/testpmd: command to configure MTU")
Cc: stable@dpdk.org

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
---
v1 -> v2:
	Address the comments form Ferruh Yigit, the related link as below:
	http://patches.dpdk.org/patch/65007/
---
 app/test-pmd/config.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 9669cbd4c..409c1327a 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -1216,7 +1216,9 @@ void
 port_mtu_set(portid_t port_id, uint16_t mtu)
 {
 	int diag;
+	struct rte_port *rte_port = &ports[port_id];
 	struct rte_eth_dev_info dev_info;
+	uint16_t eth_overhead;
 	int ret;
 
 	if (port_id_is_invalid(port_id, ENABLED_WARN))
@@ -1232,8 +1234,25 @@ port_mtu_set(portid_t port_id, uint16_t mtu)
 		return;
 	}
 	diag = rte_eth_dev_set_mtu(port_id, mtu);
-	if (diag == 0)
+	if (diag == 0 &&
+	    dev_info.rx_offload_capa & DEV_RX_OFFLOAD_JUMBO_FRAME) {
+		/*
+		 * Ether overhead in driver is equal to the difference of
+		 * max_rx_pktlen and max_mtu in rte_eth_dev_info when the
+		 * device supports jumbo frame.
+		 */
+		eth_overhead = dev_info.max_rx_pktlen - dev_info.max_mtu;
+		if (mtu > RTE_ETHER_MAX_LEN - eth_overhead) {
+			rte_port->dev_conf.rxmode.offloads |=
+						DEV_RX_OFFLOAD_JUMBO_FRAME;
+			rte_port->dev_conf.rxmode.max_rx_pkt_len =
+						mtu + eth_overhead;
+		} else
+			rte_port->dev_conf.rxmode.offloads &=
+						~DEV_RX_OFFLOAD_JUMBO_FRAME;
+
 		return;
+	}
 	printf("Set MTU failed. diag=%d\n", diag);
 }
 
-- 
2.23.0