Re: [net] Octeontx2-vf: Fix max packet length errors

[Hariprasad Kelam <hkelam@marvell.com>]

On 2025-07-04 at 20:45:11, Simon Horman (horms@kernel.org) wrote:
> On Wed, Jul 02, 2025 at 04:35:18PM +0530, Hariprasad Kelam wrote:
> > Implement packet length validation before submitting packets to
> > the hardware to prevent MAXLEN_ERR.
> > 
> > Fixes: 3184fb5ba96e ("octeontx2-vf: Virtual function driver support")
> > Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
> > ---
> >  drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
> > index 8a8b598bd389..766237cd86c3 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
> > +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
> > @@ -394,6 +394,13 @@ static netdev_tx_t otx2vf_xmit(struct sk_buff *skb, struct net_device *netdev)
> >  	struct otx2_snd_queue *sq;
> >  	struct netdev_queue *txq;
> >  
> > +	/* Check for minimum and maximum packet length */
> > +	if (skb->len <= ETH_HLEN ||
> > +	    (!skb_shinfo(skb)->gso_size && skb->len > vf->tx_max_pktlen)) {
> > +		dev_kfree_skb(skb);
> > +		return NETDEV_TX_OK;
> > +	}
> 
> Hi Hariprasad,
> 
> I see the same check in otx2_xmit().
> But I wonder if in that case and this one the rx drop counter for the
> netdev should be incremented.
>  
  Assuming its tx_drop counter, Will add suggested change in V2.
  
> Also, do you need this check in rvu_rep_xmit() too?
> 
  ACK, will add this check in V2.

THanks,
Hariprasad k 

> > +
> >  	sq = &vf->qset.sq[qidx];
> >  	txq = netdev_get_tx_queue(netdev, qidx);
> >  
> > -- 
> > 2.34.1
> > 
> > 
>