RE: [PATCH] cifs: smbd: Update receive credits before sending and deal with credits roll back on failure before sending

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>Subject: Re: [PATCH] cifs: smbd: Update receive credits before sending and
>deal with credits roll back on failure before sending
>
>Hi,
>
>Thank you for the patch! Perhaps something to improve:
>
>[auto build test WARNING on cifs/for-next] [also build test WARNING on v5.6
>next-20200331] [if your patch is applied to the wrong git tree, please drop us a
>note to help improve the system. BTW, we also suggest to use '--base' option
>to specify the base tree in git format-patch, please see
>https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstack
>overflow.com%2Fa%2F37406982&data=02%7C01%7Clongli%40microsoft.
>com%7Cfd3236457b134cab5aa708d7d6a23124%7C72f988bf86f141af91ab2d7cd
>011db47%7C1%7C0%7C637213864404913375&sdata=cMWv%2F9OFGZbe
>wPd1QSe2cevsCi4Lu%2BU8NTmKtn4UbUs%3D&reserved=0]
>
>url:
>https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithu
>b.com%2F0day-ci%2Flinux%2Fcommits%2Flongli-linuxonhyperv-com%2Fcifs-
>smbd-Update-receive-credits-before-sending-and-deal-with-credits-roll-
>back-on-failure-before-sending%2F20200331-
>152104&data=02%7C01%7Clongli%40microsoft.com%7Cfd3236457b134ca
>b5aa708d7d6a23124%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C63
>7213864404913375&sdata=B7NJcoR5AXP0B5SS3GJ36GT%2B78sVsfXGRa
>MqaMZ3r7c%3D&reserved=0
>base:   git://git.samba.org/sfrench/cifs-2.6.git for-next
>reproduce:
>        # apt-get install sparse
>        # sparse version: v0.6.1-187-gbff9b106-dirty
>        make ARCH=x86_64 allmodconfig
>        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
>:::::: branch date: 10 hours ago
>:::::: commit date: 10 hours ago
>
>If you fix the issue, kindly add following tag
>Reported-by: kbuild test robot <lkp@xxxxxxxxx>

Sent v2 to fix this.

Thanks,
Long

>
>>> fs/cifs/smbdirect.c:856:26: sparse: sparse: incorrect type in argument 1
>(different base types) @@    expected int i @@    got restricted __le16
>[usertyint i @@
>>> fs/cifs/smbdirect.c:856:26: sparse:    expected int i
>>> fs/cifs/smbdirect.c:856:26: sparse:    got restricted __le16 [usertype]
>credits_granted
>>> fs/cifs/smbdirect.c:905:35: sparse: sparse: invalid assignment: +=
>>> fs/cifs/smbdirect.c:905:35: sparse:    left side has type int
>>> fs/cifs/smbdirect.c:905:35: sparse:    right side has type restricted __le16
>   fs/cifs/smbdirect.c:907:26: sparse: sparse: incorrect type in argument 1
>(different base types) @@    expected int i @@    got restricted __le16
>[usertyint i @@
>   fs/cifs/smbdirect.c:907:26: sparse:    expected int i
>   fs/cifs/smbdirect.c:907:26: sparse:    got restricted __le16 [usertype]
>credits_granted
>
>#
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>ci%2Flinux%2Fcommit%2Fe5b2c129dd7cb9db51cd025f988ff5bc2b0990a9&amp
>;data=02%7C01%7Clongli%40microsoft.com%7Cfd3236457b134cab5aa708d7d6
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>13375&amp;sdata=J86JPBj4OUDrdvhwA%2FUbSo9mRoZIQI39hww1H2nMyss
>%3D&amp;reserved=0
>git remote add linux-review
>https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithu
>b.com%2F0day-
>ci%2Flinux&amp;data=02%7C01%7Clongli%40microsoft.com%7Cfd3236457b13
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>54xiguD3Yfs%3D&amp;reserved=0
>git remote update linux-review
>git checkout e5b2c129dd7cb9db51cd025f988ff5bc2b0990a9
>vim +856 fs/cifs/smbdirect.c
>
>f198186aa9bbd6 Long Li 2017-11-04  806
>f198186aa9bbd6 Long Li 2017-11-04  807  /*
>f198186aa9bbd6 Long Li 2017-11-04  808   * Build and prepare the SMBD packet
>header
>f198186aa9bbd6 Long Li 2017-11-04  809   * This function waits for avaialbe
>send credits and build a SMBD packet
>f198186aa9bbd6 Long Li 2017-11-04  810   * header. The caller then optional
>append payload to the packet after
>f198186aa9bbd6 Long Li 2017-11-04  811   * the header
>f198186aa9bbd6 Long Li 2017-11-04  812   * intput values
>f198186aa9bbd6 Long Li 2017-11-04  813   * size: the size of the payload
>f198186aa9bbd6 Long Li 2017-11-04  814   * remaining_data_length: remaining
>data to send if this is part of a
>f198186aa9bbd6 Long Li 2017-11-04  815   * fragmented packet
>f198186aa9bbd6 Long Li 2017-11-04  816   * output values
>f198186aa9bbd6 Long Li 2017-11-04  817   * request_out: the request allocated
>from this function
>f198186aa9bbd6 Long Li 2017-11-04  818   * return values: 0 on success,
>otherwise actual error code returned
>f198186aa9bbd6 Long Li 2017-11-04  819   */
>f198186aa9bbd6 Long Li 2017-11-04  820  static int smbd_create_header(struct
>smbd_connection *info,
>f198186aa9bbd6 Long Li 2017-11-04  821  		int size, int
>remaining_data_length,
>f198186aa9bbd6 Long Li 2017-11-04  822  		struct smbd_request
>**request_out)
>f198186aa9bbd6 Long Li 2017-11-04  823  {
>f198186aa9bbd6 Long Li 2017-11-04  824  	struct smbd_request *request;
>f198186aa9bbd6 Long Li 2017-11-04  825  	struct smbd_data_transfer
>*packet;
>f198186aa9bbd6 Long Li 2017-11-04  826  	int header_length;
>f198186aa9bbd6 Long Li 2017-11-04  827  	int rc;
>f198186aa9bbd6 Long Li 2017-11-04  828
>f198186aa9bbd6 Long Li 2017-11-04  829  	/* Wait for send credits. A
>SMBD packet needs one credit */
>f198186aa9bbd6 Long Li 2017-11-04  830  	rc =
>wait_event_interruptible(info->wait_send_queue,
>f198186aa9bbd6 Long Li 2017-11-04  831  		atomic_read(&info-
>>send_credits) > 0 ||
>f198186aa9bbd6 Long Li 2017-11-04  832  		info-
>>transport_status != SMBD_CONNECTED);
>f198186aa9bbd6 Long Li 2017-11-04  833  	if (rc)
>f198186aa9bbd6 Long Li 2017-11-04  834  		return rc;
>f198186aa9bbd6 Long Li 2017-11-04  835
>f198186aa9bbd6 Long Li 2017-11-04  836  	if (info->transport_status !=
>SMBD_CONNECTED) {
>f198186aa9bbd6 Long Li 2017-11-04  837  		log_outgoing(ERR,
>"disconnected not sending\n");
>62fdf6707ebd46 Long Li 2019-04-05  838  		return -EAGAIN;
>f198186aa9bbd6 Long Li 2017-11-04  839  	}
>f198186aa9bbd6 Long Li 2017-11-04  840  	atomic_dec(&info-
>>send_credits);
>f198186aa9bbd6 Long Li 2017-11-04  841
>f198186aa9bbd6 Long Li 2017-11-04  842  	request =
>mempool_alloc(info->request_mempool, GFP_KERNEL);
>f198186aa9bbd6 Long Li 2017-11-04  843  	if (!request) {
>f198186aa9bbd6 Long Li 2017-11-04  844  		rc = -ENOMEM;
>e5b2c129dd7cb9 Long Li 2020-03-31  845  		goto err_alloc;
>f198186aa9bbd6 Long Li 2017-11-04  846  	}
>f198186aa9bbd6 Long Li 2017-11-04  847
>f198186aa9bbd6 Long Li 2017-11-04  848  	request->info = info;
>f198186aa9bbd6 Long Li 2017-11-04  849
>f198186aa9bbd6 Long Li 2017-11-04  850  	/* Fill in the packet header */
>f198186aa9bbd6 Long Li 2017-11-04  851  	packet =
>smbd_request_payload(request);
>f198186aa9bbd6 Long Li 2017-11-04  852  	packet->credits_requested =
>cpu_to_le16(info->send_credit_target);
>f198186aa9bbd6 Long Li 2017-11-04  853  	packet->credits_granted =
>f198186aa9bbd6 Long Li 2017-11-04  854
>	cpu_to_le16(manage_credits_prior_sending(info));
>f198186aa9bbd6 Long Li 2017-11-04  855  	info->send_immediate = false;
>e5b2c129dd7cb9 Long Li 2020-03-31 @856  	atomic_add(packet-
>>credits_granted, &info->receive_credits);
>f198186aa9bbd6 Long Li 2017-11-04  857
>f198186aa9bbd6 Long Li 2017-11-04  858  	packet->flags = 0;
>f198186aa9bbd6 Long Li 2017-11-04  859  	if
>(manage_keep_alive_before_sending(info))
>f198186aa9bbd6 Long Li 2017-11-04  860  		packet->flags |=
>cpu_to_le16(SMB_DIRECT_RESPONSE_REQUESTED);
>f198186aa9bbd6 Long Li 2017-11-04  861
>f198186aa9bbd6 Long Li 2017-11-04  862  	packet->reserved = 0;
>f198186aa9bbd6 Long Li 2017-11-04  863  	if (!size)
>f198186aa9bbd6 Long Li 2017-11-04  864  		packet->data_offset =
>0;
>f198186aa9bbd6 Long Li 2017-11-04  865  	else
>f198186aa9bbd6 Long Li 2017-11-04  866  		packet->data_offset =
>cpu_to_le32(24);
>f198186aa9bbd6 Long Li 2017-11-04  867  	packet->data_length =
>cpu_to_le32(size);
>f198186aa9bbd6 Long Li 2017-11-04  868  	packet-
>>remaining_data_length = cpu_to_le32(remaining_data_length);
>f198186aa9bbd6 Long Li 2017-11-04  869  	packet->padding = 0;
>f198186aa9bbd6 Long Li 2017-11-04  870
>f198186aa9bbd6 Long Li 2017-11-04  871  	log_outgoing(INFO,
>"credits_requested=%d credits_granted=%d "
>f198186aa9bbd6 Long Li 2017-11-04  872  		"data_offset=%d
>data_length=%d remaining_data_length=%d\n",
>f198186aa9bbd6 Long Li 2017-11-04  873  		le16_to_cpu(packet-
>>credits_requested),
>f198186aa9bbd6 Long Li 2017-11-04  874  		le16_to_cpu(packet-
>>credits_granted),
>f198186aa9bbd6 Long Li 2017-11-04  875  		le32_to_cpu(packet-
>>data_offset),
>f198186aa9bbd6 Long Li 2017-11-04  876  		le32_to_cpu(packet-
>>data_length),
>f198186aa9bbd6 Long Li 2017-11-04  877  		le32_to_cpu(packet-
>>remaining_data_length));
>f198186aa9bbd6 Long Li 2017-11-04  878
>f198186aa9bbd6 Long Li 2017-11-04  879  	/* Map the packet to DMA */
>f198186aa9bbd6 Long Li 2017-11-04  880  	header_length = sizeof(struct
>smbd_data_transfer);
>f198186aa9bbd6 Long Li 2017-11-04  881  	/* If this is a packet without
>payload, don't send padding */
>f198186aa9bbd6 Long Li 2017-11-04  882  	if (!size)
>f198186aa9bbd6 Long Li 2017-11-04  883  		header_length =
>offsetof(struct smbd_data_transfer, padding);
>f198186aa9bbd6 Long Li 2017-11-04  884
>f198186aa9bbd6 Long Li 2017-11-04  885  	request->num_sge = 1;
>f198186aa9bbd6 Long Li 2017-11-04  886  	request->sge[0].addr =
>ib_dma_map_single(info->id->device,
>f198186aa9bbd6 Long Li 2017-11-04  887
>		 (void *)packet,
>f198186aa9bbd6 Long Li 2017-11-04  888
>		 header_length,
>7f46d23e1b14f0 Long Li 2019-05-13  889
>		 DMA_TO_DEVICE);
>f198186aa9bbd6 Long Li 2017-11-04  890  	if
>(ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
>f198186aa9bbd6 Long Li 2017-11-04  891
>	mempool_free(request, info->request_mempool);
>f198186aa9bbd6 Long Li 2017-11-04  892  		rc = -EIO;
>e5b2c129dd7cb9 Long Li 2020-03-31  893  		goto err_dma;
>f198186aa9bbd6 Long Li 2017-11-04  894  	}
>f198186aa9bbd6 Long Li 2017-11-04  895
>f198186aa9bbd6 Long Li 2017-11-04  896  	request->sge[0].length =
>header_length;
>f198186aa9bbd6 Long Li 2017-11-04  897  	request->sge[0].lkey = info-
>>pd->local_dma_lkey;
>f198186aa9bbd6 Long Li 2017-11-04  898
>f198186aa9bbd6 Long Li 2017-11-04  899  	*request_out = request;
>f198186aa9bbd6 Long Li 2017-11-04  900  	return 0;
>f198186aa9bbd6 Long Li 2017-11-04  901
>e5b2c129dd7cb9 Long Li 2020-03-31  902  err_dma:
>e5b2c129dd7cb9 Long Li 2020-03-31  903  	/* roll back receive credits */
>e5b2c129dd7cb9 Long Li 2020-03-31  904  	spin_lock(&info-
>>lock_new_credits_offered);
>e5b2c129dd7cb9 Long Li 2020-03-31 @905  	info->new_credits_offered +=
>packet->credits_granted;
>e5b2c129dd7cb9 Long Li 2020-03-31  906  	spin_unlock(&info-
>>lock_new_credits_offered);
>e5b2c129dd7cb9 Long Li 2020-03-31  907  	atomic_sub(packet-
>>credits_granted, &info->receive_credits);
>e5b2c129dd7cb9 Long Li 2020-03-31  908
>e5b2c129dd7cb9 Long Li 2020-03-31  909  err_alloc:
>e5b2c129dd7cb9 Long Li 2020-03-31  910  	/* roll back send credits */
>f198186aa9bbd6 Long Li 2017-11-04  911  	atomic_inc(&info-
>>send_credits);
>e5b2c129dd7cb9 Long Li 2020-03-31  912
>f198186aa9bbd6 Long Li 2017-11-04  913  	return rc;
>f198186aa9bbd6 Long Li 2017-11-04  914  }
>f198186aa9bbd6 Long Li 2017-11-04  915
>
>---
>0-DAY CI Kernel Test Service, Intel Corporation
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