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Thu, 15 Apr 2021 18:26:11 +0000 Received: from DM6PR03MB4777.namprd03.prod.outlook.com ([fe80::3958:bb2f:f23e:f89e]) by DM6PR03MB4777.namprd03.prod.outlook.com ([fe80::3958:bb2f:f23e:f89e%7]) with mapi id 15.20.3999.037; Thu, 15 Apr 2021 18:26:11 +0000 From: "Dey, Souvik" To: "dev@dpdk.org" CC: "wenzhuo.lu@intel.com" , "konstantin.ananyev@intel.com" , "Lal, Shuchin" Thread-Topic: Link status is not coming properly in case of 82599 on VmWare SR-IOV case. 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X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Hi All, We are seeing a weird issue where the link status of 82599 NIC in SR-= IOV mode in VmWare is coming as UP even though the vmnic is taken DOWN in = the ESXi. This is working fine when we use a linux to handle the interface= inside of DPDK. We are using DPDK 18.11.6 and seeing this issue specific = to 82599(ixgbe_vf) pmd only. The same is working fine in KVM setup also. O= n debugging more on this what we are seeing is that - On VmWare : When the link is made down in the esxi, we are getting a IXGBE_VT_MSGTYPE_= NACK message in the mailbox. The links_reg =3D IXGBE_READ_REG(hw, IXGBE_VFLINKS); if (!(links_reg & IXGBE_LINKS_UP)) goto out; is not hitting and it goes to this section , if (!(in_msg & IXGBE_VT_MSGTYPE_CTS)) { /* msg is not CTS and is NACK we must have lost CTS status */ if (in_msg & IXGBE_VT_MSGTYPE_NACK) mac->get_link_status =3D false; goto out; } And as we are setting the get_link_status to false ,and as it returns the = link=20status *link_up =3D !mac->get_link_status; It is becoming as UP. In KVM setup : The register read itself is show link down and we are all good there. On checking why linux is working and not DPDK, we see that in the ixgbevf = code in linux , in the function ixgbevf_check_mac_link_vf, we see that if (!(in_msg & IXGBE_VT_MSGTYPE_CTS)) { /* msg is not CTS and is NACK we must have lost CTS status = */ if (in_msg & IXGBE_VT_MSGTYPE_NACK) ret_val =3D -1; goto out; } It returns an error, but the status is not reset to UP. So, is the code of setting the link as UP in case of receiving a NACK in t= he mailbox the correct handling or not ? Can some one throw some light on = this. -- Regards, Souvik Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance=20or distribution by others or forwarding without expres= s permission is strictly prohibited. If you are not the intended recipient= , please notify the sender immediately and then delete all copies, includi= ng any attachments.