From: Stephen Hemminger <stephen@networkplumber.org>
To: Olivier MATZ <olivier.matz@6wind.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH RFC 00/11] ixgbe/mbuf: add TSO support
Date: Fri, 9 May 2014 17:39:03 -0700 [thread overview]
Message-ID: <20140509173903.7c5464af@nehalam.linuxnetplumber.net> (raw)
In-Reply-To: <536D4D79.4080609@6wind.com>
On Fri, 09 May 2014 23:49:45 +0200
Olivier MATZ <olivier.matz@6wind.com> wrote:
> Hi Stephen,
>
> On 05/09/2014 07:04 PM, Stephen Hemminger wrote:
> > I would also like to propose changing the checksum offload flags.
> > Many devices can indicate good checksum in some cases but can't test
> > for many other types of packets. By changing the flags to be:
> > PKT_RX_L4_CKSUM_GOOD and PKT_RX_IP_CKSUM_GOOD
> >
> > It is then possible to support devices where some cases (IPv4 + TCP)
> > are supported but others are not.
>
> I agree. That's also what I'm talking about in the commit log of
> the patch 08/11.
>
> If there is not much rework for all the patches, I think it's feasible
> to include this kind of modification in the v2 of this series.
>
> Regards,
> Olivier
>
There are three checksum states:
1. Known good
2. Known bad
3. Can't tell
Current choice of flags makes handling #3 impossible. If you change it to CKSUM_GOOD
then 1 => GOOD, 2 => not GOOD, 3 => not GOOD. And for case #3 the software can
validate it. For most cases IP checksum offload is meaning less anyway because
the IP header fits in a single cache line, and the cost to checksum is minimal.
next prev parent reply other threads:[~2014-05-10 0:39 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-09 14:50 Olivier Matz
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 01/11] igb/ixgbe: fix IP checksum calculation Olivier Matz
2014-05-15 10:40 ` Ananyev, Konstantin
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 02/11] mbuf: rename RTE_MBUF_SCATTER_GATHER into RTE_MBUF_REFCNT Olivier Matz
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 03/11] mbuf: remove rte_ctrlmbuf Olivier Matz
2014-05-25 21:39 ` Gilmore, Walter E
2014-05-26 12:23 ` Olivier MATZ
2014-05-26 16:40 ` Dumitrescu, Cristian
2014-05-26 22:43 ` Neil Horman
2014-05-27 0:17 ` Stephen Hemminger
2014-05-28 9:45 ` Ananyev, Konstantin
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 04/11] mbuf: remove the rte_pktmbuf structure Olivier Matz
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 05/11] mbuf: merge physaddr and buf_len in a bitfield Olivier Matz
2014-05-09 15:39 ` Shaw, Jeffrey B
2014-05-09 16:06 ` Olivier MATZ
2014-05-09 16:11 ` Shaw, Jeffrey B
2014-05-14 14:07 ` Ananyev, Konstantin
2014-05-15 9:53 ` Olivier MATZ
2014-05-19 7:27 ` Olivier MATZ
2014-05-19 8:25 ` Richardson, Bruce
2014-05-19 9:30 ` Olivier MATZ
2014-05-19 9:57 ` Richardson, Bruce
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 06/11] mbuf: replace data pointer by an offset Olivier Matz
2014-05-12 14:12 ` Thomas Monjalon
2014-05-12 14:36 ` Venkatesan, Venky
2014-05-12 14:41 ` Neil Horman
2014-05-12 15:07 ` Olivier MATZ
2014-05-12 15:59 ` Stephen Hemminger
2014-05-12 16:13 ` Olivier MATZ
2014-05-12 17:13 ` Stephen Hemminger
2014-05-13 13:29 ` Olivier MATZ
2014-05-12 16:06 ` Venkatesan, Venky
2014-05-12 18:39 ` Neil Horman
2014-05-13 13:54 ` Venkatesan, Venky
2014-05-13 14:09 ` Thomas Monjalon
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 07/11] mbuf: add functions to get the name of an ol_flag Olivier Matz
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 08/11] mbuf: change ol_flags to 32 bits Olivier Matz
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 09/11] mbuf: rename vlan_macip_len in hw_offload and increase its size Olivier Matz
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 10/11] testpmd: modify source address to validate checksum calculation Olivier Matz
2014-05-09 14:50 ` [dpdk-dev] [PATCH RFC 11/11] ixgbe/mbuf: add TSO support Olivier Matz
2014-05-12 14:30 ` Thomas Monjalon
2014-05-15 15:09 ` Ananyev, Konstantin
2014-05-15 15:39 ` Olivier MATZ
2014-05-15 16:30 ` Ananyev, Konstantin
2014-05-16 12:11 ` Olivier MATZ
2014-05-16 17:01 ` Ananyev, Konstantin
2014-05-19 12:32 ` Thomas Monjalon
2014-05-09 17:04 ` [dpdk-dev] [PATCH RFC 00/11] " Stephen Hemminger
2014-05-09 21:49 ` Olivier MATZ
2014-05-10 0:39 ` Stephen Hemminger [this message]
2014-05-19 12:47 ` Thomas Monjalon
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