octeontx2-af: Wait for TX link idle for credits change
NIX_AF_TX_LINKX_NORM_CREDIT holds running counter of tx credits available per link. But, tx credits should be configured based on MTU config. So MTU change needs tx credit count update. An issue exists whereby when both PF & VF are enabled and PF traffic is flowing, if VF requests for MTU update, updating the NORM_CREDIT register will lead to corruption of credit count and subsequent deadlock of tx link as the NORM_CREDIT register holds running count. This patch provides workaround by pausing link traffic using NIX_AF_TL1X_SW_XOFF, waiting for existing packets to drain, and used credits be returned before updating new credit count. Signed-off-by:Nithin Dabilpuram <ndabilpuram@marvell.com> Signed-off-by:
Sunil Goutham <sgoutham@marvell.com> Signed-off-by:
Geetha sowjanya <gakula@marvell.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
parent
906999c9