From: "Zhang, Qi Z" <qi.z.zhang@intel.com>
To: "Yigit, Ferruh" <ferruh.yigit@intel.com>,
"Stokes, Ian" <ian.stokes@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Cc: "stephen@networkplumber.org" <stephen@networkplumber.org>,
"Lu, Wenzhuo" <wenzhuo.lu@intel.com>,
"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
"Xing, Beilei" <beilei.xing@intel.com>
Subject: Re: [dpdk-dev] [PATCH v2 6/7] net/e1000: set min and max MTU for igb devices
Date: Tue, 26 Mar 2019 13:58:53 +0000 [thread overview]
Message-ID: <039ED4275CED7440929022BC67E7061153354B5E@SHSMSX103.ccr.corp.intel.com> (raw)
Message-ID: <20190326135853.hAwi8mWfNPYLVBPCLZYl6OUH5-r4LxQwuVm4no4x5rc@z> (raw)
In-Reply-To: <4916320d-5a37-a33d-0a01-5e10bc99123c@intel.com>
> -----Original Message-----
> From: Yigit, Ferruh
> Sent: Monday, March 25, 2019 10:25 PM
> To: Stokes, Ian <ian.stokes@intel.com>; dev@dpdk.org
> Cc: stephen@networkplumber.org; Lu, Wenzhuo <wenzhuo.lu@intel.com>;
> Ananyev, Konstantin <konstantin.ananyev@intel.com>; Xing, Beilei
> <beilei.xing@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>
> Subject: Re: [dpdk-dev] [PATCH v2 6/7] net/e1000: set min and max MTU for igb
> devices
>
> On 3/22/2019 1:01 PM, Ian Stokes wrote:
> > This commit sets the min and max supported MTU values for igb devices
> > via the eth_igb_info_get() function. Min MTU supported is set to
> > ETHER_MIN_MTU and max mtu is calculated as the max packet length
> > supported minus the transport overhead. To aid in these calculations a
> > new MACRO 'E1000_ETH_OVERHEAD' has been introduced to consolidate
> > overhead calculation and avoid duplication.
> >
> > Signed-off-by: Ian Stokes <ian.stokes@intel.com>
> > ---
> > drivers/net/e1000/e1000_ethdev.h | 6 ++++++
> > drivers/net/e1000/igb_ethdev.c | 7 +++++--
> > 2 files changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/e1000/e1000_ethdev.h
> > b/drivers/net/e1000/e1000_ethdev.h
> > index 94edff08e..3e74cd8fe 100644
> > --- a/drivers/net/e1000/e1000_ethdev.h
> > +++ b/drivers/net/e1000/e1000_ethdev.h
> > @@ -89,6 +89,12 @@
> > ETH_RSS_IPV6_UDP_EX)
> >
> > /*
> > + * The overhead from MTU to max frame size.
> > + * Considering VLAN so a tag needs to be counted.
> > + */
> > +#define E1000_ETH_OVERHEAD (ETHER_HDR_LEN + ETHER_CRC_LEN +
> > +VLAN_TAG_SIZE)
>
> As an overhead, following drivers set:
> i40e: HDR + CRC + 2 * VLAN
> ixgbe: HDR + CRC
> e1000: HDR + CRC + VLAN
>
> I wonder if this difference is HW limitation, or driver limitation or just
> implementation inconsistency.
I think this is implementation inconsistency
The NIC only accept Max Frame Size.
The problem here is seems all of three setup are not perfect.
HDR + CRC + 2 * VLAN - it may allow non vlan or single vlan packet that exceed mtu.
HDR + CRC - it may reject vlan or double vlan packet that follow mtu.
HDR + CRC + VLAN , it may reject double vlan packet that follow mtu
I agree it's better to keep consistent on all drivers, but before this, we may need to decide which one we should take :)
Regards
Qi
>
> Better to confirm it that it is not implementation inconsistency.
>
> Wenzhuo, Konstantin, Beilei, Qi,
>
> Can you please comment?
>
> Thanks,
> ferruh
next prev parent reply other threads:[~2019-03-26 13:58 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 13:01 [dpdk-dev] [PATCH v2 0/7] ethdev: add min/max MTU to device info Ian Stokes
2019-03-22 13:01 ` Ian Stokes
2019-03-22 13:01 ` [dpdk-dev] [PATCH v2 1/7] " Ian Stokes
2019-03-22 13:01 ` Ian Stokes
2019-03-25 14:26 ` Ferruh Yigit
2019-03-25 14:26 ` Ferruh Yigit
2019-03-22 13:01 ` [dpdk-dev] [PATCH v2 2/7] net/i40e: set min and max MTU for i40e devices Ian Stokes
2019-03-22 13:01 ` Ian Stokes
2019-03-22 13:01 ` [dpdk-dev] [PATCH v2 3/7] net/i40e: set min and max MTU for i40e VF devices Ian Stokes
2019-03-22 13:01 ` Ian Stokes
2019-03-22 13:01 ` [dpdk-dev] [PATCH v2 4/7] net/ixgbe: set min and max MTU for ixgbe devices Ian Stokes
2019-03-22 13:01 ` Ian Stokes
2019-03-22 13:01 ` [dpdk-dev] [PATCH v2 5/7] net/ixgbe: set min and max MTU for ixgbe VF devices Ian Stokes
2019-03-22 13:01 ` Ian Stokes
2019-03-22 13:01 ` [dpdk-dev] [PATCH v2 6/7] net/e1000: set min and max MTU for igb devices Ian Stokes
2019-03-22 13:01 ` Ian Stokes
2019-03-25 14:25 ` Ferruh Yigit
2019-03-25 14:25 ` Ferruh Yigit
2019-03-26 13:58 ` Zhang, Qi Z [this message]
2019-03-26 13:58 ` Zhang, Qi Z
2019-03-26 14:02 ` Ananyev, Konstantin
2019-03-26 14:02 ` Ananyev, Konstantin
2019-03-26 14:09 ` Zhang, Qi Z
2019-03-26 14:09 ` Zhang, Qi Z
2019-03-26 14:18 ` Ananyev, Konstantin
2019-03-26 14:18 ` Ananyev, Konstantin
2019-03-27 1:13 ` Zhang, Qi Z
2019-03-27 1:13 ` Zhang, Qi Z
2019-03-27 7:02 ` Zhang, Qi Z
2019-03-27 7:02 ` Zhang, Qi Z
2019-03-22 13:01 ` [dpdk-dev] [PATCH v2 7/7] app/testpmd: verify mtu with rte_eth_dev_info_get() Ian Stokes
2019-03-22 13:01 ` Ian Stokes
2019-03-25 14:20 ` Ferruh Yigit
2019-03-25 14:20 ` Ferruh Yigit
2019-03-28 16:41 ` Ferruh Yigit
2019-03-28 16:41 ` Ferruh Yigit
2019-03-28 16:43 ` [dpdk-dev] [PATCH v2 0/7] ethdev: add min/max MTU to device info Ferruh Yigit
2019-03-28 16:43 ` Ferruh Yigit
2019-03-29 17:52 ` [dpdk-dev] [PATCH v3 1/7] " Ferruh Yigit
2019-03-29 17:52 ` Ferruh Yigit
2019-03-29 17:52 ` [dpdk-dev] [PATCH v3 2/7] net/i40e: set min and max MTU for i40e devices Ferruh Yigit
2019-03-29 17:52 ` Ferruh Yigit
2019-03-29 17:52 ` [dpdk-dev] [PATCH v3 3/7] net/i40e: set min and max MTU for i40e VF devices Ferruh Yigit
2019-03-29 17:52 ` Ferruh Yigit
2019-03-29 17:52 ` [dpdk-dev] [PATCH v3 4/7] net/ixgbe: set min and max MTU for ixgbe devices Ferruh Yigit
2019-03-29 17:52 ` Ferruh Yigit
2019-03-29 17:52 ` [dpdk-dev] [PATCH v3 5/7] net/ixgbe: set min and max MTU for ixgbe VF devices Ferruh Yigit
2019-03-29 17:52 ` Ferruh Yigit
2019-03-29 17:52 ` [dpdk-dev] [PATCH v3 6/7] net/e1000: set min and max MTU for igb devices Ferruh Yigit
2019-03-29 17:52 ` Ferruh Yigit
2019-03-29 17:52 ` [dpdk-dev] [PATCH v3 7/7] app/testpmd: verify MTU with device provided limits Ferruh Yigit
2019-03-29 17:52 ` Ferruh Yigit
2019-03-29 17:56 ` [dpdk-dev] [PATCH v3 1/7] ethdev: add min/max MTU to device info Ferruh Yigit
2019-03-29 17:56 ` Ferruh Yigit
2019-03-29 18:05 ` Ferruh Yigit
2019-03-29 18:05 ` Ferruh Yigit
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