[dpdk-dev] [PATCH] app/testpmd: do not enable Rx offloads by default

Thomas Monjalon thomas at monjalon.net
Thu Jan 25 10:04:11 CET 2018


25/01/2018 02:11, Lu, Wenzhuo:
> > --- a/app/test-pmd/testpmd.c
> > +++ b/app/test-pmd/testpmd.c
> > @@ -305,9 +305,7 @@ struct fwd_engine * fwd_engines[] = {
> >   */
> >  struct rte_eth_rxmode rx_mode = {
> >  	.max_rx_pkt_len = ETHER_MAX_LEN, /**< Default maximum frame
> > length. */
> > -	.offloads = (DEV_RX_OFFLOAD_VLAN_FILTER |
> > -		     DEV_RX_OFFLOAD_VLAN_STRIP |
> > -		     DEV_RX_OFFLOAD_CRC_STRIP),
> > +	.offloads = 0,
> 
> Change the default behavior may trigger other problems. I think TX offload could be a good reference. Get the capability and check what's supported first, then ignore the not supported functions with printing a warning but not block anything...

I agree that we should check the capabilities before requesting an offload.
But I disagree on another point: we should not enable an offload if the
user did not request it explicitly. It makes things unclear.
This is a testing tool, it should be close to the ethdev API behavior.

Why these offload flags are silently enabled?


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