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SubjectRe: [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://stackoverflow.com/a/37406982]

url: https://github.com/0day-ci/linux/commits/longli-linuxonhyperv-com/cifs-smbd-Update-receive-credits-before-sending-and-deal-with-credits-roll-back-on-failure-before-sending/20200331-152104
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@intel.com>

>> 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

# https://github.com/0day-ci/linux/commit/e5b2c129dd7cb9db51cd025f988ff5bc2b0990a9
git remote add linux-review https://github.com/0day-ci/linux
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
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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