[PATCH v4] gro: bug fix in identifying fragmented packets

[Hu, Jiayu]

Sure. Will review soon.

Thanks,
Jiayu

> -----Original Message-----
> From: Thomas Monjalon <thomas at monjalon.net>
> Sent: Thursday, June 9, 2022 4:14 PM
> To: Hu, Jiayu <jiayu.hu at intel.com>
> Cc: dev at dpdk.org; Kumara Parameshwaran
> <kumaraparamesh92 at gmail.com>; stable at dpdk.org
> Subject: Re: [PATCH v4] gro: bug fix in identifying fragmented packets
> 
> Jiayu, please could you review this patch?
> 
> 
> 08/06/2022 11:57, Kumara Parameshwaran:
> > From: Kumara Parameshwaran <kumaraparamesh92 at gmail.com>
> >
> > A packet with RTE_PTYPE_L4_FRAG(0x300) contains both
> RTE_PTYPE_L4_TCP
> > (0x100) & RTE_PTYPE_L4_UDP (0x200). A fragmented packet as defined in
> > rte_mbuf_ptype.h cannot be recognized as other L4 types and hence the
> > GRO layer should not use IS_IPV4_TCP_PKT or IS_IPV4_UDP_PKT for
> > RTE_PTYPE_L4_FRAG. Hence, if the packet type is RTE_PTYPE_L4_FRAG the
> > ip header should be parsed to recognize the appropriate IP type and
> > invoke the respective gro handler.
> >
> > Fixes: 1ca5e6740852 ("gro: support UDP/IPv4")
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: Kumara Parameshwaran <kumaraparamesh92 at gmail.com>
> > ---
> > v1:
> > * Introduce IS_IPV4_FRAGMENT macro to check if fragmented packet and
> >   if true extract the IP header to identify the protocol type and
> >   invoke the appropriate gro handler. This is done for both
> >   rte_gro_reassemble and rte_gro_reassemble_burst APIs.
> > v2,v3,v4:
> > * Fix extra whitespace and column limit warnings
> >
> >  lib/gro/rte_gro.c | 43 +++++++++++++++++++++++++++++++++++++++++--
> >  1 file changed, 41 insertions(+), 2 deletions(-)  lib/gro/rte_gro.c |
> > 43 +++++++++++++++++++++++++++++++++++++++++--
> >  1 file changed, 41 insertions(+), 2 deletions(-)
> >
> > diff --git a/lib/gro/rte_gro.c b/lib/gro/rte_gro.c index
> > 6f7dd4d709..83d6e21dbb 100644
> > --- a/lib/gro/rte_gro.c
> > +++ b/lib/gro/rte_gro.c
> > @@ -38,6 +38,9 @@ static gro_tbl_pkt_count_fn
> tbl_pkt_count_fn[RTE_GRO_TYPE_MAX_NUM] = {
> >  		((ptype & RTE_PTYPE_L4_UDP) == RTE_PTYPE_L4_UDP) && \
> >  		(RTE_ETH_IS_TUNNEL_PKT(ptype) == 0))
> >
> > +#define IS_IPV4_FRAGMENT(ptype) (RTE_ETH_IS_IPV4_HDR(ptype) && \
> > +		((ptype & RTE_PTYPE_L4_FRAG) == RTE_PTYPE_L4_FRAG))
> > +
> >  #define IS_IPV4_VXLAN_TCP4_PKT(ptype) (RTE_ETH_IS_IPV4_HDR(ptype)
> && \
> >  		((ptype & RTE_PTYPE_L4_UDP) == RTE_PTYPE_L4_UDP) && \
> >  		((ptype & RTE_PTYPE_TUNNEL_VXLAN) == \ @@ -240,7
> +243,28 @@
> > rte_gro_reassemble_burst(struct rte_mbuf **pkts,
> >  		 * The timestamp is ignored, since all packets
> >  		 * will be flushed from the tables.
> >  		 */
> > -		if (IS_IPV4_VXLAN_TCP4_PKT(pkts[i]->packet_type) &&
> > +		if (IS_IPV4_FRAGMENT(pkts[i]->packet_type)) {
> > +			struct rte_ipv4_hdr ip4h_copy;
> > +			const struct rte_ipv4_hdr *ip4h =
> rte_pktmbuf_read(pkts[i], pkts[i]->l2_len,
> > +
> 					sizeof(*ip4h), &ip4h_copy);
> > +			if (ip4h->next_proto_id == IPPROTO_UDP &&
> do_udp4_gro) {
> > +				ret = gro_udp4_reassemble(pkts[i],
> > +							&udp_tbl, 0);
> > +				if (ret > 0)
> > +					nb_after_gro--;
> > +				else if (ret < 0)
> > +					unprocess_pkts[unprocess_num++] =
> pkts[i];
> > +			} else if (ip4h->next_proto_id == IPPROTO_TCP &&
> do_tcp4_gro) {
> > +				ret = gro_tcp4_reassemble(pkts[i],
> > +						&tcp_tbl, 0);
> > +				if (ret > 0)
> > +					nb_after_gro--;
> > +				else if (ret < 0)
> > +					unprocess_pkts[unprocess_num++] =
> pkts[i];
> > +			} else {
> > +				unprocess_pkts[unprocess_num++] = pkts[i];
> > +			}
> > +		} else if (IS_IPV4_VXLAN_TCP4_PKT(pkts[i]->packet_type) &&
> >  				do_vxlan_tcp_gro) {
> >  			ret = gro_vxlan_tcp4_reassemble(pkts[i],
> >  							&vxlan_tcp_tbl, 0);
> > @@ -349,7 +373,22 @@ rte_gro_reassemble(struct rte_mbuf **pkts,
> >  	current_time = rte_rdtsc();
> >
> >  	for (i = 0; i < nb_pkts; i++) {
> > -		if (IS_IPV4_VXLAN_TCP4_PKT(pkts[i]->packet_type) &&
> > +		if (IS_IPV4_FRAGMENT(pkts[i]->packet_type)) {
> > +			struct rte_ipv4_hdr ip4h_copy;
> > +			const struct rte_ipv4_hdr *ip4h =
> rte_pktmbuf_read(pkts[i], pkts[i]->l2_len,
> > +
> 					sizeof(*ip4h), &ip4h_copy);
> > +			if (ip4h->next_proto_id == IPPROTO_UDP &&
> do_udp4_gro) {
> > +				if (gro_udp4_reassemble(pkts[i], udp_tbl,
> > +						current_time) < 0)
> > +					unprocess_pkts[unprocess_num++] =
> pkts[i];
> > +			} else if (ip4h->next_proto_id == IPPROTO_TCP &&
> do_tcp4_gro) {
> > +				if (gro_tcp4_reassemble(pkts[i], tcp_tbl,
> > +						current_time) < 0)
> > +					unprocess_pkts[unprocess_num++] =
> pkts[i];
> > +			} else {
> > +				unprocess_pkts[unprocess_num++] = pkts[i];
> > +			}
> > +		} else if (IS_IPV4_VXLAN_TCP4_PKT(pkts[i]->packet_type) &&
> >  				do_vxlan_tcp_gro) {
> >  			if (gro_vxlan_tcp4_reassemble(pkts[i], vxlan_tcp_tbl,
> >  						current_time) < 0)
> >
> 
> 
> 
>