Hi Darrell, Thank you for your comments! I created a second version and sent it to the dev list: https://patchwork.ozlabs.org/patch/811387/
Best regards, Zoltan > -----Original Message----- > From: Darrell Ball [mailto:[email protected]] > Sent: Thursday, September 07, 2017 12:45 AM > To: Zoltán Balogh <[email protected]>; '[email protected]' > <[email protected]> > Subject: Re: [ovs-dev] [PATCH] netdev-dpdk: reset packet_type for reused > dp_packets > > > > On 9/6/17, 5:12 AM, "[email protected] on behalf of Zoltán > Balogh" <[email protected] on > behalf of [email protected]> wrote: > > DPDK uses dp-packet pool for storing received packets. The pool is > reused by rxq_recv funcions of the DPDK netdevs. The datapath is > capable to modify the packet_type property of packets. For instance > when encapsulated L3 packets are received on a ptap gre port. > In this case the packet_type property of struct dp_packet can be > modified and later the same dp_packet with the modified packet_type > can be reused in the rxq_rec function, so it can contain corrupted > data. > > The dp_packet_batch_init_cutlen() in the rxq_recv functions iterates > over dp_packets and sets their cutlen. So I modified this function > to set packet_type to Ethernet for the dp_packets as well. I also > renamed this function because of the added functionality. > > The dp_packet_batch_init_cutlen() iterates over batch->count dp_packet. > Therefore setting of batch->count = nb_rx needs to be done before the > former function is invoked. This is an additional fix. > > Signed-off-by: Zoltán Balogh <[email protected]> > Signed-off-by: László Sürü <[email protected]> > Co-authored-by: László Sürü <[email protected]> > CC: Jan Scheurich <[email protected]> > CC: Sugesh Chandran <[email protected]> > CC: Darrell Ball <[email protected]> > --- > lib/dp-packet.h | 4 +++- > lib/netdev-dpdk.c | 5 +++-- > 2 files changed, 6 insertions(+), 3 deletions(-) > > diff --git a/lib/dp-packet.h b/lib/dp-packet.h > index 046f3ab..0046d0a 100644 > --- a/lib/dp-packet.h > +++ b/lib/dp-packet.h > @@ -805,12 +805,14 @@ dp_packet_delete_batch(struct dp_packet_batch > *batch, bool may_steal) > } > > static inline void > -dp_packet_batch_init_cutlen(struct dp_packet_batch *batch) > +dp_packet_batch_init_transient_fields(struct dp_packet_batch *batch) > > [Darrell] > Can we just call this function dp_packet_batch_init_packet_fields() now that > it has wider scope than just cutlen, > as the name makes it clear that we are initing the individual packet fields > of a batch, rather than the batch > context fields ? > ‘transient’ is maybe implied ? > > > { > struct dp_packet *packet; > > DP_PACKET_BATCH_FOR_EACH (packet, batch) { > dp_packet_reset_cutlen(packet); > + /* Set packet_type to Ethernet. */ > + packet->packet_type = PACKET_TYPE_BE(OFPHTN_ONF, 0x0000); > > > [Darrell] The original dp_packet init code for PTAP has > b->packet_type = htonl(PT_ETH); > This form seems preferred and intuitive (comment would even be unnecessary); > can we use this form ? > > Also, the original dp_packet init code for PTAP was in dp_packet_init__ and > then moved to dp_packet_init_dpdk > I think we can just remove it from there, as it is redundant with the new > code. > > > } > } > > diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c > index f58e9be..2422741 100644 > --- a/lib/netdev-dpdk.c > +++ b/lib/netdev-dpdk.c > @@ -1644,8 +1644,9 @@ netdev_dpdk_vhost_rxq_recv(struct netdev_rxq *rxq, > nb_rx, dropped); > rte_spinlock_unlock(&dev->stats_lock); > > - dp_packet_batch_init_cutlen(batch); > batch->count = (int) nb_rx; > > [Darrell] Although nothing to do with this patch, can we remove the cast > ‘(int)’ above ? > > > + dp_packet_batch_init_transient_fields(batch); > > [Darrell] > Good catch; this should work better than initializing 0 of the entries ( > > + > return 0; > } > > @@ -1684,8 +1685,8 @@ netdev_dpdk_rxq_recv(struct netdev_rxq *rxq, struct > dp_packet_batch *batch) > rte_spinlock_unlock(&dev->stats_lock); > } > > - dp_packet_batch_init_cutlen(batch); > batch->count = nb_rx; > + dp_packet_batch_init_transient_fields(batch); > > [Darrell] > Same comment as above. > > return 0; > } > -- > 1.9.1 > > _______________________________________________ > dev mailing list > [email protected] > > https://urldefense.proofpoint.com/v2/url?u=https-3A__mail.openvswitch.org_mailman_listinfo_ovs- > 2Ddev&d=DwIFAw&c=uilaK90D4TOVoH58JNXRgQ&r=BVhFA09CGX7JQ5Ih-uZnsw&m=zcjvUT1lz85oUJWStkTlRzIdXuQnJ4HL- > n6oiK99iuM&s=KmEO2izD43oNVigXXu6TlPCLNruTmVtKMGdxVb6ANYs&e= > _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
