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net/igc: remove MTU setting limitation

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Currently, if requested MTU is bigger than mbuf size and scattered
receive is not enabled, setting MTU to that value fails.

This patch allows setting this special MTU when device is stopped,
because scattered_rx will be re-configured during next port start
and driver may enable scattered receive according new MTU value.

After this patch, driver may select different receive function
automatically after MTU set, according MTU values selected.

Fixes: a5aeb2b9e2 ("net/igc: support Rx and Tx")
Cc: stable@dpdk.org

Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
Acked-by: Jeff Guo <jia.guo@intel.com>
This commit is contained in:
Dapeng Yu 2021-02-19 18:01:07 +08:00 committed by Qi Zhang
parent da996000e8
commit 5db232fa5a
1 changed files with 6 additions and 4 deletions
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10
drivers/net/igc/igc_ethdev.c
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@ -1590,12 +1590,14 @@ eth_igc_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
return -EINVAL;
/*
* refuse mtu that requires the support of scattered packets when
* this feature has not been enabled before.
* If device is started, refuse mtu that requires the support of
* scattered packets when this feature has not been enabled before.
*/
if (!dev->data->scattered_rx &&
frame_size > dev->data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM)
if (dev->data->dev_started && !dev->data->scattered_rx &&
frame_size > dev->data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM) {
PMD_INIT_LOG(ERR, "Stop port first.");
return -EINVAL;
}
rctl = IGC_READ_REG(hw, IGC_RCTL);