Hi,
I'll try so sum it up this interesting discussion about checksum API for TSO.
We know at least 2 checksum methods:
- the standard one
- the special one for ixgbe TSO
In Linux ixgbe, checksum is redone in the driver for TSO case.
We want to compute checksum in the application/stack in order t
TSO in the future.
If #1 means moving pseudo checksum calculation out of PMD code, then my vote
would be for it.
Konstantin
-Original Message-
From: Olivier MATZ [mailto:olivier.m...@6wind.com]
Sent: Friday, May 16, 2014 1:12 PM
To: Ananyev, Konstantin; dev at dpdk.org
Subject: Re: [dpdk-dev]
Hi Konstantin,
On 05/15/2014 06:30 PM, Ananyev, Konstantin wrote:
> With the current DPDK implementation the upper code would still be different
> for TCP checksum (without segmentation) and TCP segmentation:
> different flags in mbuf, with TSO you need to setup l4_len and mss fields
> inside mb
Hi Konstantin,
On 05/15/2014 05:09 PM, Ananyev, Konstantin wrote:
> By design PMD not supposed to touch (or even look) into actual packet's data.
I agree on the principle, we should avoid that as much as possible.
> That is one of the reason why we put l2/l3/l4_len fields into the mbuf itself.
>
y 15, 2014 4:40 PM
To: Ananyev, Konstantin; dev at dpdk.org
Subject: Re: [dpdk-dev] [PATCH RFC 11/11] ixgbe/mbuf: add TSO support
Hi Konstantin,
On 05/15/2014 05:09 PM, Ananyev, Konstantin wrote:
> By design PMD not supposed to touch (or even look) into actual packet's data.
I agree on t
k.org
Subject: [dpdk-dev] [PATCH RFC 11/11] ixgbe/mbuf: add TSO support
Implement TSO (TCP segmentation offload) in ixgbe driver. To delegate
the TCP segmentation to the hardware, the user has to:
- set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
PKT_TX_IP_CKSUM and PKT_TX_T
2014-05-09 16:50, Olivier Matz:
> Implement TSO (TCP segmentation offload) in ixgbe driver. To delegate
> the TCP segmentation to the hardware, the user has to:
>
> - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
> PKT_TX_IP_CKSUM and PKT_TX_TCP_CKSUM)
> - fill the mbuf->hw_of
Implement TSO (TCP segmentation offload) in ixgbe driver. To delegate
the TCP segmentation to the hardware, the user has to:
- set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
PKT_TX_IP_CKSUM and PKT_TX_TCP_CKSUM)
- fill the mbuf->hw_offload information: l2_len, l3_len, l4_len, m
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