Re: [PATCH 2/3] hv_netvsc: Wait for completion on request NVSP_MSG4_TYPE_SWITCH_DATA_PATH

[kernel test robot]

Hi Long,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.11-rc2 next-20210104]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Long-Li/hv_netvsc-Check-VF-datapath-when-sending-traffic-to-VF/20210106-092237
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e71ba9452f0b5b2e8dc8aa5445198cd9214a6a62
config: i386-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/8c92b5574da1b0c2aee3eab7da2c4dad8d92572c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Long-Li/hv_netvsc-Check-VF-datapath-when-sending-traffic-to-VF/20210106-092237
        git checkout 8c92b5574da1b0c2aee3eab7da2c4dad8d92572c
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   drivers/net/hyperv/netvsc.c: In function 'netvsc_send_completion':
>> drivers/net/hyperv/netvsc.c:778:14: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     778 |   pkt_rqst = (struct nvsp_message *)cmd_rqst;
         |              ^


vim +778 drivers/net/hyperv/netvsc.c

   757	
   758	static void netvsc_send_completion(struct net_device *ndev,
   759					   struct netvsc_device *net_device,
   760					   struct vmbus_channel *incoming_channel,
   761					   const struct vmpacket_descriptor *desc,
   762					   int budget)
   763	{
   764		const struct nvsp_message *nvsp_packet = hv_pkt_data(desc);
   765		u32 msglen = hv_pkt_datalen(desc);
   766		struct nvsp_message *pkt_rqst;
   767		u64 cmd_rqst;
   768	
   769		/* First check if this is a VMBUS completion without data payload */
   770		if (!msglen) {
   771			cmd_rqst = vmbus_request_addr(&incoming_channel->requestor,
   772						      (u64)desc->trans_id);
   773			if (cmd_rqst == VMBUS_RQST_ERROR) {
   774				netdev_err(ndev, "Invalid transaction id\n");
   775				return;
   776			}
   777	
 > 778			pkt_rqst = (struct nvsp_message *)cmd_rqst;
   779			switch (pkt_rqst->hdr.msg_type) {
   780			case NVSP_MSG4_TYPE_SWITCH_DATA_PATH:
   781				complete(&net_device->channel_init_wait);
   782				break;
   783	
   784			default:
   785				netdev_err(ndev, "Unexpected VMBUS completion!!\n");
   786			}
   787			return;
   788		}
   789	
   790		/* Ensure packet is big enough to read header fields */
   791		if (msglen < sizeof(struct nvsp_message_header)) {
   792			netdev_err(ndev, "nvsp_message length too small: %u\n", msglen);
   793			return;
   794		}
   795	
   796		switch (nvsp_packet->hdr.msg_type) {
   797		case NVSP_MSG_TYPE_INIT_COMPLETE:
   798			if (msglen < sizeof(struct nvsp_message_header) +
   799					sizeof(struct nvsp_message_init_complete)) {
   800				netdev_err(ndev, "nvsp_msg length too small: %u\n",
   801					   msglen);
   802				return;
   803			}
   804			fallthrough;
   805	
   806		case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
   807			if (msglen < sizeof(struct nvsp_message_header) +
   808					sizeof(struct nvsp_1_message_send_receive_buffer_complete)) {
   809				netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
   810					   msglen);
   811				return;
   812			}
   813			fallthrough;
   814	
   815		case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
   816			if (msglen < sizeof(struct nvsp_message_header) +
   817					sizeof(struct nvsp_1_message_send_send_buffer_complete)) {
   818				netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
   819					   msglen);
   820				return;
   821			}
   822			fallthrough;
   823	
   824		case NVSP_MSG5_TYPE_SUBCHANNEL:
   825			if (msglen < sizeof(struct nvsp_message_header) +
   826					sizeof(struct nvsp_5_subchannel_complete)) {
   827				netdev_err(ndev, "nvsp_msg5 length too small: %u\n",
   828					   msglen);
   829				return;
   830			}
   831			/* Copy the response back */
   832			memcpy(&net_device->channel_init_pkt, nvsp_packet,
   833			       sizeof(struct nvsp_message));
   834			complete(&net_device->channel_init_wait);
   835			break;
   836	
   837		case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
   838			netvsc_send_tx_complete(ndev, net_device, incoming_channel,
   839						desc, budget);
   840			break;
   841	
   842		default:
   843			netdev_err(ndev,
   844				   "Unknown send completion type %d received!!\n",
   845				   nvsp_packet->hdr.msg_type);
   846		}
   847	}
   848	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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