linux-kernel - Re: [PATCH] net: qrtr: Do not do DEL_SERVER broadcast after DEL

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Date:   Thu, 30 Mar 2023 15:18:07 +0530
From:   Sricharan Ramabadhran <quic_srichara@...cinc.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
CC:     <mani@...nel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux-arm-msm@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: qrtr: Do not do DEL_SERVER broadcast after
 DEL_CLIENT



On 3/30/2023 11:54 AM, Manivannan Sadhasivam wrote:
> On Wed, Mar 29, 2023 at 06:37:30PM +0530, Sricharan R wrote:
>> When the qrtr socket is released, qrtr_port_remove gets called, which
>> broadcasts a DEL_CLIENT. After this DEL_SERVER is also additionally
>> broadcasted, which becomes NOP, but triggers the below error msg.
>>
>> "failed while handling packet from 2:-2", since remote node already
>> acted upon on receiving the DEL_CLIENT, once again when it receives
>> the DEL_SERVER, it returns -ENOENT.
>>
>> Fixing it by not sending a 'DEL_SERVER' to remote when a 'DEL_CLIENT'
>> was sent for that port.
>>
> 
> Can you share the qrtr trace when this happens to help me understand the flow?

    Flow is like this.

     IPQ                                   SDX
     ---                           	  ----
                                 	 qrtr_release
                                          qrtr_port_remove
                                 	 qrtr_send_del_client
                                        		|
                                     		|
                                     		|
                                     		|
    RX CTRL: cmd:0x6 addr[0x2:0x40d4]<-----------|
     (qrtr_send_client broadcasts it to          |
      the remote,                      		|
      IPQ cleans up the port)                    |
                                          	|
	                              ctrl_cmd_del_client
        		                        (send_del_client
	               	                 also forwards the
	                       	         DEL_CLIENT to
         	                       	 internal ns.c.
	                                 Which then again
         	                         sends DEL_server
                 	                 to same port to
                         	         remote)
                                 	       |
                                                |
    RX CTRL: cmd:0x5 SVC[0x1389:0x1]            |
      addr[0x2:0x40d4] <-------------------- ---|
      (IPQ on receiving the DEL_SERVER on
       same port throws the message
       "failed while handling packet from 2:-2")


  Regards,
    Sricharan