From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Chas Williams <3chas3@gmail.com>, dev@dpdk.org, olivier.matz@6wind.com
Cc: Bill Hong <bhong@brocade.com>,
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 16:50:50 +0000 [thread overview]
Message-ID: <23cc0c89-0333-3300-6acb-e69d8d56c811@intel.com> (raw)
Message-ID: <20190326165050.a6h2J2IIDWEW6PFLOE2KjL0uWH9AkWvUXDBjOedUWBI@z> (raw)
In-Reply-To: <20190325150541.12087-1-3chas3@gmail.com>
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.
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 16:50 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 [this message]
2019-03-26 16:50 ` Ferruh Yigit
2019-03-26 18:01 ` Chas Williams
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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