From: Chas Williams <3chas3@gmail.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>,
dev@dpdk.org, olivier.matz@6wind.com
Cc: stable@dpdk.org, Chas Williams <chas3@att.com>,
Andrew Rybchenko <arybchenko@solarflare.com>
Subject: Re: [dpdk-dev] [PATCH] net: fix Tx VLAN flag for offload emulation
Date: Tue, 26 Mar 2019 14:01:59 -0400 [thread overview]
Message-ID: <9b0d3a56-4941-dfb4-5702-fb09e913cf96@gmail.com> (raw)
Message-ID: <20190326180159.ijS2zS7r83Yib0utMfzWU7cZoTE5MAnFqk0gkulZlNg@z> (raw)
In-Reply-To: <23cc0c89-0333-3300-6acb-e69d8d56c811@intel.com>
On 3/26/19 12:50 PM, Ferruh Yigit wrote:
> On 3/25/2019 3:05 PM, Chas Williams wrote:
>> From: Bill Hong <bhong@brocade.com>
>>
>> A PMD might use rte_vlan_insert to implement Tx VLAN offload. Typically
>> the PMD will insert the VLAN header in the transmit path and then attempt
>> to send the packets. If this fails, the packets are returned to
>> the application which may attempt to send these packets again. If the
>> PKT_TX_VLAN flag is not cleared, the transmit path may attempt to insert
>> the VLAN header again.
>>
>> Fixes: 47aa48b969f8 ("net: fix stripped VLAN flag for offload emulation");
>> Cc: stable@dpdk.org
>>
>> Signed-off-by: Bill Hong <bhong@brocade.com>
>> Signed-off-by: Chas Williams <chas3@att.com>
>> ---
>> lib/librte_net/rte_ether.h | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/lib/librte_net/rte_ether.h b/lib/librte_net/rte_ether.h
>> index c2c5e249f..e0d831113 100644
>> --- a/lib/librte_net/rte_ether.h
>> +++ b/lib/librte_net/rte_ether.h
>> @@ -408,7 +408,7 @@ static inline int rte_vlan_insert(struct rte_mbuf **m)
>> vh = (struct vlan_hdr *) (nh + 1);
>> vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci);
>>
>> - (*m)->ol_flags &= ~PKT_RX_VLAN_STRIPPED;
>> + (*m)->ol_flags &= ~(PKT_RX_VLAN_STRIPPED | PKT_TX_VLAN);
>
> Hi Chas,
>
> Looks reasonable, AFAIK, PKT_TX_VLAN flag means 'mbuf->vlan_tci' has valid value
> and a request from application to driver to insert VLAN information.
> After successful insertion flag can be removed.
>
> But in mbuf header, flags documented as:
> PKT_TX_VLAN: TX packet is a 802.1q VLAN packet.
> PKT_TX_QINQ: TX packet with double VLAN inserted.
Note the usage slightly below:
/**
* Bitmask of all supported packet Tx offload features flags,
* which can be set for packet.
*/
#define PKT_TX_OFFLOAD_MASK ( \
PKT_TX_OUTER_IPV6 | \
PKT_TX_OUTER_IPV4 | \
PKT_TX_OUTER_IP_CKSUM | \
PKT_TX_VLAN_PKT | \
So this implies that PKT_TX_VLAN_PKT (which is PKT_TX_VLAN's old name)
is an offload feature, not that the actual packet has an 802.1q header
(offloaded or otherwise).
The same seems to apply for PKT_TX_QINQ.
> Hi Oliver,
>
> Is above comments correct, or I am missing something J
>
>
> Also here cleaning 'PKT_RX_VLAN_STRIPPED' looks like to say 'vlan' information
> is not stripped but in the packet data, but 'RX' in this context can be
> confusing, should we have a more generic 'PKT_VLAN_STRIPPED' ?
>
next prev parent reply other threads:[~2019-03-26 18:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-25 15:05 Chas Williams
2019-03-25 15:05 ` Chas Williams
2019-03-26 16:50 ` Ferruh Yigit
2019-03-26 16:50 ` Ferruh Yigit
2019-03-26 18:01 ` Chas Williams [this message]
2019-03-26 18:01 ` Chas Williams
2019-04-01 20:17 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2019-04-01 20:17 ` Ferruh Yigit
2019-04-04 17:07 ` [dpdk-dev] " Ferruh Yigit
2019-04-04 17:07 ` Ferruh Yigit
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