[dpdk-dev] [PATCH] lib/librte_ether: error handling on MAC address replay

Steve Shin (jonshin) jonshin at cisco.com
Fri Jan 20 03:30:21 CET 2017

Thanks Igor for your comments!

A good point on the first item.
For the second question, I walked through device initialization routines to see any other potential issue.
I found one case where index 0 is still required to replay MAC address; ex) MAC address change on the PHY port – index 0
No code path was found to restore a changed MAC value with index 0. Therefore, we may have to use the existing rte_eth_dev_config_restore() function to replay 0 indexed MAC.
Currently rte_eth_dev_default_mac_addr_set() is called to program PHY MAC without setting mac_pool_sel for 0 index.
So the following code is also required inside rte_eth_dev_default_mac_addr_set() routine as a complete solution:
@@ -2237,6 +2234,9 @@ struct rte_eth_dev *

        (*dev->dev_ops->mac_addr_set)(dev, addr);

+       /* Update pool bitmap in NIC data structure */
+       dev->data->mac_pool_sel[0] = 1;
        return 0;

Any thoughts would be appreciated.


From: Igor Ryzhov <iryzhov at nfware.com>
Date: Thursday, January 19, 2017 at 2:39 PM
To: Steve Shin <jonshin at cisco.com>
Cc: "dev at dpdk.org" <dev at dpdk.org>, "ferruh.yigit at intel.com" <ferruh.yigit at intel.com>
Subject: Re: [dpdk-dev] [PATCH] lib/librte_ether: error handling on MAC address replay

Hello Steve,

Thank you for the patch.

I think a couple of improvements can be done:
1. Function existence check – if (*dev->dev_ops->mac_addr_add) – can be taken out of the loop. We don't need to check it on each iteration.
2. I'm not completely sure, but I think loop can be started from 1, not from 0, because mac_pool_sel[0] is always zero. Am I right?

Best regards,

On Thu, Jan 19, 2017 at 10:35 PM, Steve Shin (jonshin) <jonshin at cisco.com<mailto:jonshin at cisco.com>> wrote:
Dear maintainer,

Sorry that I forgot to add “Fixes:” line as follows:

       Fixes: 4bdefaade6d1 ("ethdev: VMDQ enhancements")

Can you please add the above line as part of comment?


On 1/19/17, 10:47 AM, "Steve Shin (jonshin)" <jonshin at cisco.com<mailto:jonshin at cisco.com>> wrote:

    This patch fixes a bug in replaying MAC address to the hardware
    in rte_eth_dev_config_restore() routine.

    Signed-off-by: Steve Shin <jonshin at cisco.com<mailto:jonshin at cisco.com>>
     lib/librte_ether/rte_ethdev.c | 10 ++++++----
     1 file changed, 6 insertions(+), 4 deletions(-)

    diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
    index 4790faf..7e01f10 100644
    --- a/lib/librte_ether/rte_ethdev.c
    +++ b/lib/librte_ether/rte_ethdev.c
    @@ -951,10 +951,12 @@ rte_eth_dev_config_restore(uint8_t port_id)

                /* add address to the hardware */
    -           if  (*dev->dev_ops->mac_addr_add &&
    -                   (dev->data->mac_pool_sel[i] & (1ULL << pool)))
    -                   (*dev->dev_ops->mac_addr_add)(dev, &addr, i, pool);
    -           else {
    +           if  (*dev->dev_ops->mac_addr_add) {
    +                   if (dev->data->mac_pool_sel[i] & (1ULL << pool))
    +                           (*dev->dev_ops->mac_addr_add)(dev, &addr, i, pool);
    +                   else
    +                           continue;
    +           } else {
                        RTE_PMD_DEBUG_TRACE("port %d: MAC address array not supported\n",
                        /* exit the loop but not return an error */

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