Haiyang Zhang <haiya...@microsoft.com> writes: >> -----Original Message----- >> From: Vitaly Kuznetsov [mailto:vkuzn...@redhat.com] >> Sent: Tuesday, November 14, 2017 11:58 AM >> To: Stephen Hemminger <step...@networkplumber.org> >> Cc: netdev@vger.kernel.org; linux-ker...@vger.kernel.org; >> de...@linuxdriverproject.org; KY Srinivasan <k...@microsoft.com>; Haiyang >> Zhang <haiya...@microsoft.com>; Stephen Hemminger >> <sthem...@microsoft.com>; Mohammed Gamal <mmo...@redhat.com> >> Subject: Re: [PATCH net] hv_netvsc: preserve hw_features on >> mtu/channels/ringparam changes >> >> Stephen Hemminger <step...@networkplumber.org> writes: >> >> > On Tue, 14 Nov 2017 16:22:05 +0100 >> > Vitaly Kuznetsov <vkuzn...@redhat.com> wrote: >> > >> > Yes, this looks like a real issue. >> > >> >> + /* Query hardware capabilities if we're called from netvsc_probe() */ >> >> + if (!net->hw_features) { >> >> + ret = rndis_netdev_set_hwcaps(net_device, rndis_device); >> >> + if (ret != 0) >> >> + goto err_dev_remv; >> >> + } >> >> + >> > >> > Rather than conditional behavior in rndis_filter_device_add, it would >> > be cleaner to make the call to get hardware capabilities there. >> > >> > Please respin and make the query of host a separate function. >> >> You mean call rndis_netdev_set_hwcaps() from netvsc_probe()? Will do. >> >> One question though: in case we'll be avoiding >> rndis_filter_set_offload_params() call on mtu/channels/ringparam changes - >> - can we trust the host to preserve what was there before the RNDIS reset? >> In case not we'll have to untangle what is >> rndis_netdev_set_hwcaps() in my patch splitting it into two: hw_features >> setup and rndis_filter_set_offload_params() and leaving the later in >> rndis_filter_device_add(). > > After remove/re-add RNDIS dev, you should pass the parameters to the host > again. >
Thanks, this changes a lot. I'll prepare v2. -- Vitaly
