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examples/kni: fix MTU change to setup Tx queue

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This patch adds a fix to setup Tx queue when changing KNI interface MTU.
It ensures device can safely start txq post MTU change operation.

Fixes: fc9ee41b7016 ("examples/kni: convert to new ethdev offloads API")
Cc: stable@dpdk.org

Signed-off-by: Rasesh Mody <rmody@marvell.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
This commit is contained in:
Rasesh Mody 2020-05-13 21:09:38 -07:00 committed by Thomas Monjalon
parent 31246a328f
commit a26b116749
1 changed files with 13 additions and 1 deletions
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14
examples/kni/main.c
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@ -774,9 +774,11 @@ kni_change_mtu(uint16_t port_id, unsigned int new_mtu)
{
int ret;
uint16_t nb_rxd = NB_RXD;
uint16_t nb_txd = NB_TXD;
struct rte_eth_conf conf;
struct rte_eth_dev_info dev_info;
struct rte_eth_rxconf rxq_conf;
struct rte_eth_txconf txq_conf;
if (!rte_eth_dev_is_valid_port(port_id)) {
RTE_LOG(ERR, APP, "Invalid port id %d\n", port_id);
@ -804,7 +806,7 @@ kni_change_mtu(uint16_t port_id, unsigned int new_mtu)
return ret;
}
ret = rte_eth_dev_adjust_nb_rx_tx_desc(port_id, &nb_rxd, NULL);
ret = rte_eth_dev_adjust_nb_rx_tx_desc(port_id, &nb_rxd, &nb_txd);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Could not adjust number of descriptors "
"for port%u (%d)\n", (unsigned int)port_id,
@ -829,6 +831,16 @@ kni_change_mtu(uint16_t port_id, unsigned int new_mtu)
return ret;
}
txq_conf = dev_info.default_txconf;
txq_conf.offloads = conf.txmode.offloads;
ret = rte_eth_tx_queue_setup(port_id, 0, nb_txd,
rte_eth_dev_socket_id(port_id), &txq_conf);
if (ret < 0) {
RTE_LOG(ERR, APP, "Fail to setup Tx queue of port %d\n",
port_id);
return ret;
}
/* Restart specific port */
ret = rte_eth_dev_start(port_id);
if (ret < 0) {