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nvethernet: limit MTU size as per dma channel

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Issue: for MGBE with 10 channel enabled TCP tx
is failing with 16k MTU because payload checksum
errors getting incremented due to lesser MTL buffer
available for each dma channel

Fix: Allow MTU more than 9000 for single channel
configuration only

Bug 3536247

Change-Id: I675342cb401723aaa58171f00721786b4d69f57d
Signed-off-by: Om Prakash Singh <omp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2672802
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Om Prakash Singh
2022-03-30 13:51:42 +05:30
committed by Revanth Kumar Uppala
parent 6479c24ff8
commit 5f6dd1210b
1 changed files with 1 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/nvidia/nvethernet/ether_linux.c
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@@ -3906,8 +3906,7 @@ static int ether_change_mtu(struct net_device *ndev, int new_mtu)
}
if ((new_mtu > OSI_MTU_SIZE_9000) &&
(osi_dma->num_dma_chans != 1U) &&
(osi_core->mac == OSI_MAC_HW_EQOS)) {
(osi_dma->num_dma_chans != 1U)) {
netdev_err(pdata->ndev,
"MTU greater than %d is valid only in single channel configuration\n"
, OSI_MTU_SIZE_9000);