DPDK patches and discussions
 help / color / mirror / Atom feed
From: Souvik Dey <sodey@rbbn.com>
To: beilei.xing@intel.com, qi.z.zhang@intel.com
Cc: dev@dpdk.org, Souvik Dey <sodey@rbbn.com>
Subject: [dpdk-dev] [PATCH] net/i40e: issue with ADD VLAN from Guest
Date: Tue, 14 Apr 2020 19:06:59 -0400	[thread overview]
Message-ID: <20200414230659.14520-1-sodey@rbbn.com> (raw)

In case of i40evf pmd, when ADD_VLAN is sent down the linux i40e driver,
along with add the vlan the kernel driver also enables the vlan stripping
by default.
This might have issues if the app configured DEV_RX_OFFLOAD_VLAN_STRIP
as off at the port configuration. The app after adding the VLAN will
expect the VLAN to be coming in the received packets but, due to
VLAN_STRIP enabled at the PF, it will get stripped.
This behavior of the Linux driver causes confussion with the DPDK app
using i40e_pmd. So it is better to check the state of the
DEV_RX_OFFLOAD_VLAN_STRIP flag in the dev_conf and disable the vlan strip
after sending add_vlan if app configured the VLAN_STRIP as disabled.


Signed-off-by: Souvik Dey <sodey@rbbn.com>
---
 drivers/net/i40e/i40e_ethdev_vf.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 244397e..d9c30be 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -1044,6 +1044,7 @@ i40evf_add_vlan(struct rte_eth_dev *dev, uint16_t vlanid)
 {
 	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
 	struct virtchnl_vlan_filter_list *vlan_list;
+	struct rte_eth_conf *dev_conf = &dev->data->dev_conf;
 	uint8_t cmd_buffer[sizeof(struct virtchnl_vlan_filter_list) +
 							sizeof(uint16_t)];
 	int err;
@@ -1060,8 +1061,21 @@ i40evf_add_vlan(struct rte_eth_dev *dev, uint16_t vlanid)
 	args.out_buffer = vf->aq_resp;
 	args.out_size = I40E_AQ_BUF_SZ;
 	err = i40evf_execute_vf_cmd(dev, &args);
-	if (err)
+	if (err) {
 		PMD_DRV_LOG(ERR, "fail to execute command OP_ADD_VLAN");
+		return err;
+	}
+	/*
+	 * In linux kernel driver on receiving ADD_VLAN it enables
+	 * VLAN_STRIP by default. So disable it if app confifured
+	 * it that way.
+	 */
+	if (!(dev_conf->rxmode.offloads & DEV_RX_OFFLOAD_VLAN_STRIP)) {
+		err = i40evf_disable_vlan_strip(dev);
+		if (err)
+			PMD_DRV_LOG(ERR, "fail to execute command disable_vlan_strip "
+				"as a part of OP_ADD_VLAN");
+	}
 
 	return err;
 }
-- 
2.9.3.windows.1


             reply	other threads:[~2020-04-14 23:07 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-14 23:06 Souvik Dey [this message]
  -- strict thread matches above, loose matches on Subject: below --
2020-12-09 17:55 Souvik Dey
2020-12-11  3:07 ` Guo, Jia
2020-12-12 12:26   ` Dey, Souvik
2020-12-09 16:23 Souvik Dey
2020-04-14 22:07 Souvik Dey
2020-04-14 21:58 Souvik Dey
2020-09-14 15:54 ` Dey, Souvik

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200414230659.14520-1-sodey@rbbn.com \
    --to=sodey@rbbn.com \
    --cc=beilei.xing@intel.com \
    --cc=dev@dpdk.org \
    --cc=qi.z.zhang@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).