Re: [dpdk-dev] [PATCH] net/i40e: fix IPv4 fragment offload issue

["Li, Xiaoyun" <xiaoyun.li@intel.com>]

Hi

> -----Original Message-----
> From: Xing, Beilei <beilei.xing@intel.com>
> Sent: Tuesday, March 2, 2021 14:54
> To: Li, Xiaoyun <xiaoyun.li@intel.com>; dev@dpdk.org; Guo, Jia
> <jia.guo@intel.com>; Finn, Emma <emma.finn@intel.com>
> Cc: stable@dpdk.org
> Subject: RE: [PATCH] net/i40e: fix IPv4 fragment offload issue
> 
> 
> 
> > -----Original Message-----
> > From: Li, Xiaoyun <xiaoyun.li@intel.com>
> > Sent: Friday, February 26, 2021 4:15 PM
> > To: dev@dpdk.org; Xing, Beilei <beilei.xing@intel.com>; Guo, Jia
> > <jia.guo@intel.com>; Finn, Emma <emma.finn@intel.com>
> > Cc: Li, Xiaoyun <xiaoyun.li@intel.com>; stable@dpdk.org
> > Subject: [PATCH] net/i40e: fix IPv4 fragment offload issue
> >
> > IPv4 fragment_offset mask was required to be 0 no matter what the spec
> > value was. But zero mask means not caring about fragment_offset field
> > then both non-frag and frag packets should hit the rule.
> >
> > But the actual fragment rules should be like the following:
> > Only non-fragment packets can hit Rule 1:
> > Rule 1: mask=0x3fff, spec=0
> > Only fragment packets can hit rule 2:
> > Rule 2: mask=0x3fff, spec=0x8, last=0x2000
> >
> > This patch allows the above rules.
> >
> > Fixes: 42044b69c67d ("net/i40e: support input set selection for FDIR")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
> > ---
> >  drivers/net/i40e/i40e_flow.c | 89
> > ++++++++++++++++++++++++++++++++----
> >  1 file changed, 80 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/net/i40e/i40e_flow.c
> > b/drivers/net/i40e/i40e_flow.c index
> > 4d44282312..86d96d9a11 100644
> > --- a/drivers/net/i40e/i40e_flow.c
> > +++ b/drivers/net/i40e/i40e_flow.c
> 
> 
> > +						   "Invalid IPv4 "
> > +						   "fragment_offset mask");
> 
> Needn't split the comments line.
> 
> > +						return -rte_errno;
> > +					}
> > +					/*
> > +					 * non-frag rule:
> > +					 * mask=0x3fff,sepc=0
> 
> Typo: sepc->spec
> 
> > +					 * frag rule:
> > +					 * mask=0x3fff,spec=0x8,last=0x2000
> > +					 */
> > +					if (frag_spec ==
> > +					    (1 << RTE_IPV4_HDR_FO_SHIFT) &&
> > +					    frag_last ==
> > RTE_IPV4_HDR_MF_FLAG) {
> > +						pctype =
> > +
> > I40E_FILTER_PCTYPE_FRAG_IPV4;
> > +					} else if (frag_spec || frag_last) {
> > +						rte_flow_error_set(error,
> > +						   EINVAL,
> > +
> > RTE_FLOW_ERROR_TYPE_ITEM,
> > +						   item,
> > +						   "Invalid IPv4 "
> > +						   "fragment_offset rule");
> 
> Same as above.
> 
> > +						return -rte_errno;
> > +					}
> > +				} else if (frag_spec || frag_last) {
> > +					rte_flow_error_set(error,
> > +						EINVAL,
> > +
> > 	RTE_FLOW_ERROR_TYPE_ITEM,
> > +						item,
> > +						"Invalid fragment_offset");
> > +					return -rte_errno;
> > +				}
> >
> >  				if (input_set & (I40E_INSET_DMAC |
> > I40E_INSET_SMAC)) {
> >  					if (input_set & (I40E_INSET_IPV4_SRC
> > |
> > --
> > 2.25.1

Thanks for the review. Will update them in v2.

BRs
Xiaoyun