On Thu Nov 11 2021, Ong Boon Leong wrote: > The previous stmmac_xdp_set_prog() implementation uses stmmac_release() > and stmmac_open() which tear down the PHY device and causes undesirable > autonegotiation which causes a delay whenever AFXDP ZC is setup. > > This patch introduces two new functions that just sufficiently tear > down DMA descriptors, buffer, NAPI process, and IRQs and reestablish > them accordingly in both stmmac_xdp_release() and stammac_xdp_open(). > > As the results of this enhancement, we get rid of transient state > introduced by the link auto-negotiation: > > $ ./xdpsock -i eth0 -t -z > > sock0@eth0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 634444 634560 > > sock0@eth0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 632330 1267072 > > sock0@eth0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 632438 1899584 > > sock0@eth0:0 txonly xdp-drv > pps pkts 1.00 > rx 0 0 > tx 632502 2532160 > > Reported-by: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx> > Signed-off-by: Ong Boon Leong <boon.leong.ong@xxxxxxxxx> Tested-by: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
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