Hi Konstantin,
> -----Original Message-----
> From: Ananyev, Konstantin
> Sent: Thursday, September 29, 2016 12:41
> To: Kulasek, TomaszX <tomaszx.kulasek at intel.com>; dev at dpdk.org
> Subject: RE: [PATCH v3 1/6] ethdev: add Tx preparation
>
> Hi Tomasz,
>
> ....
>
> > diff --git a/lib/librte_net/rte_pkt.h b/lib/librte_net/rte_pkt.h new file
> mode 100644 index 0000000..72903ac
> > --- /dev/null
> > +++ b/lib/librte_net/rte_pkt.h
> > @@ -0,0 +1,133 @@
> > +/*-
> > + * BSD LICENSE
> > + *
> > + * Copyright(c) 2016 Intel Corporation. All rights reserved.
> > + * All rights reserved.
> > + *
> > + * Redistribution and use in source and binary forms, with or without
> > + * modification, are permitted provided that the following conditions
> > + * are met:
> > + *
> > + * * Redistributions of source code must retain the above copyright
> > + * notice, this list of conditions and the following disclaimer.
> > + * * Redistributions in binary form must reproduce the above copyright
> > + * notice, this list of conditions and the following disclaimer in
> > + * the documentation and/or other materials provided with the
> > + * distribution.
> > + * * Neither the name of Intel Corporation nor the names of its
> > + * contributors may be used to endorse or promote products derived
> > + * from this software without specific prior written permission.
> > + *
> > + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
> CONTRIBUTORS
> > + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
> NOT
> > + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
> FITNESS FOR
> > + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
> COPYRIGHT
> > + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
> INCIDENTAL,
> > + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
> BUT NOT
> > + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
> LOSS OF USE,
> > + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
> AND ON ANY
> > + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
> TORT
> > + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
> OF THE USE
> > + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
> DAMAGE.
> > + */
> > +
> > +#ifndef _RTE_PKT_H_
> > +#define _RTE_PKT_H_
> > +
> > +#include <rte_ip.h>
> > +#include <rte_udp.h>
> > +#include <rte_tcp.h>
> > +#include <rte_sctp.h>
> > +
> > +/**
> > + * Validate general requirements for tx offload in packet.
> > + */
> > +static inline int
> > +rte_validate_tx_offload(struct rte_mbuf *m) {
> > + uint64_t ol_flags = m->ol_flags;
> > +
> > + /* Does packet set any of available offloads? */
> > + if (!(ol_flags & PKT_TX_OFFLOAD_MASK))
> > + return 0;
> > +
> > + /* IP checksum can be counted only for IPv4 packet */
> > + if ((ol_flags & PKT_TX_IP_CKSUM) && (ol_flags & PKT_TX_IPV6))
> > + return -EINVAL;
> > +
> > + if (ol_flags & (PKT_TX_L4_MASK | PKT_TX_TCP_SEG))
>
> Not sure what you are trying to test here?
> Is that PKT_TX_TCP_SEG is set?
> If so, then the test condition doesn't look correct to me.
>
> > + /* IP type not set */
> > + if (!(ol_flags & (PKT_TX_IPV4 | PKT_TX_IPV6)))
> > + return -EINVAL;
> > +
if (ol_flags & (PKT_TX_L4_MASK | PKT_TX_TCP_SEG))
/* IP type not set */
if (!(ol_flags & (PKT_TX_IPV4 | PKT_TX_IPV6)))
return -EINVAL;
For L4 checksums (L4_MASK == TCP_CSUM|UDP_CSUM|SCTP_CSUM) as well as for
TCP_SEG, the flag PKT_TX_IPV4 or PKT_TX_IPV6 must be set. L4_MASK doesn't
include TCP_SEG bit, so I added it to have one condition for all these cases
(check if IPV4/6 flag is set when required).
More detailed check, only for TCP_SEG is below (tso_segsz and IP_CSUM flag for
IPV4):
> > + if (ol_flags & PKT_TX_TCP_SEG)
> > + /* PKT_TX_IP_CKSUM offload not set for IPv4 TSO packet */
> > + if ((m->tso_segsz == 0) ||
> > + ((ol_flags & PKT_TX_IPV4) && !(ol_flags &
> PKT_TX_IP_CKSUM)))
> > + return -EINVAL;
> > +
>
> Why not just:
> If ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_SEG) {
PKT_TX_L4_MASK doesn't include PKT_TX_TCP_SEG, so it will always be false.
>
> uint64_t f = ol_flags & PKT_TX_L4_MASK;
>
> if ((f & (PKT_TX_IPV4 | PKT_TX_IPV6)) == 0 || f == PKT_TX_IPV4 || m-
> >tso_segsz == 0)
> return -EINVAL;
> }
>
> Instead of 2 ifs around TCP_SEG above?
>
> Konstantin
>
Tomasz
