app/testpmd: update Rx offload after setting MTU

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>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index f9c55a2..9d95202 100644 (file)
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -1215,7 +1215,9 @@ 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))
@@ -1231,8 +1233,25 @@ 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);
 }