netdev - Re: [PATCH v6 2/3] net: Add mhi-net driver

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Message-ID: <20201016183759.7fa7c0ef@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 16 Oct 2020 18:37:59 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Hemant Kumar <hemantk@...eaurora.org>
Cc:     Loic Poulain <loic.poulain@...aro.org>, davem@...emloft.net,
        netdev@...r.kernel.org, manivannan.sadhasivam@...aro.org,
        eric.dumazet@...il.com
Subject: Re: [PATCH v6 2/3] net: Add mhi-net driver

Please trim your replies.

On Fri, 16 Oct 2020 17:52:28 -0700 Hemant Kumar wrote:
> > +#include <linux/if_arp.h>
> > +#include <linux/mhi.h>
> > +#include <linux/mod_devicetable.h>
> > +#include <linux/module.h>
> > +#include <linux/netdevice.h>
> > +#include <linux/skbuff.h>
> > +#include <linux/u64_stats_sync.h>
> > +
> > +#define MIN_MTU		ETH_MIN_MTU
> > +#define MAX_MTU		0xffff  
> uci driver patch series would take care of this :)

References? What's the UCI patch series?

> > +	if (mhi_queue_is_full(mdev, DMA_TO_DEVICE))
> > +		netif_stop_queue(ndev);  
> is it possible to enable flow control on tx queue if mhi_queue_skb 
> returns non zero value and return NETDEV_TX_BUSY instead of dropping 
> packet at MHI layer ? If this is possible you dont need to export new 
> API as well.

That's not the preferred implementation. Drivers should stop the queues
in advance to avoid requeuing to the qdiscs.

> > +	ndev->tx_queue_len = 1000;  
> some of the above parameters can go in to driver data specific to sw and 
> hw channels.

Really curious to hear what you're talking about here.

Is this already in tree? Was netdev CCed on it?