[dpdk-dev] [Bug 743] Building DPDK with gcc 11.1.1 Generates Multiple Warning Messages in the i40e PMD

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=743

            Bug ID: 743
           Summary: Building DPDK with gcc 11.1.1 Generates Multiple
                    Warning Messages in the i40e PMD
           Product: DPDK
           Version: unspecified
          Hardware: POWER
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: drc at linux.vnet.ibm.com
  Target Milestone: ---

Using Fedora 34 container on ppc64le host with gcc 11.  Running the same test
in a Fedora 34 VM on x86 does not produce an error.


[root at ee54008db177 dpdk]# gcc --version
gcc (GCC) 11.1.1 20210531 (Red Hat 11.1.1-3)
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


Warning errors generated when building the i40e PMD, even after proposed fixes
for bug 739 are applied.



[root at ee54008db177 dpdk]# ninja -C build
ninja: Entering directory `build'
[1270/2422] Compiling C object
drivers/libtmp_rte_net_i40e.a.p/net_i40e_i40e_flow.c.o
In function 'i40e_flow_parse_fdir_pattern',
    inlined from 'i40e_flow_parse_fdir_filter' at
../drivers/net/i40e/i40e_flow.c:3274:8:
../drivers/net/i40e/i40e_flow.c:3052:69: warning: writing 1 byte into a region
of size 0 [-Wstringop-overflow=]
 3052 |                                 filter->input.flow_ext.flexbytes[j] =
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
 3053 |                                         raw_spec->pattern[i];
      |                                         ~~~~~~~~~~~~~~~~~~~~
In file included from ../drivers/net/i40e/i40e_flow.c:25:
../drivers/net/i40e/i40e_flow.c: In function 'i40e_flow_parse_fdir_filter':
../drivers/net/i40e/i40e_ethdev.h:628:17: note: at offset 16 into destination
object 'flexbytes' of size 16
  628 |         uint8_t flexbytes[RTE_ETH_FDIR_MAX_FLEXLEN];
      |                 ^~~~~~~~~
In function 'i40e_flow_parse_fdir_pattern',
    inlined from 'i40e_flow_parse_fdir_filter' at
../drivers/net/i40e/i40e_flow.c:3274:8:
../drivers/net/i40e/i40e_flow.c:3054:69: warning: writing 1 byte into a region
of size 0 [-Wstringop-overflow=]
 3054 |                                 filter->input.flow_ext.flex_mask[j] =
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
 3055 |                                         raw_mask->pattern[i];
      |                                         ~~~~~~~~~~~~~~~~~~~~
In file included from ../drivers/net/i40e/i40e_flow.c:25:
../drivers/net/i40e/i40e_flow.c: In function 'i40e_flow_parse_fdir_filter':
../drivers/net/i40e/i40e_ethdev.h:630:17: note: at offset 16 into destination
object 'flex_mask' of size 16
  630 |         uint8_t flex_mask[I40E_FDIR_MAX_FLEX_LEN];
      |                 ^~~~~~~~~
In function 'i40e_flow_parse_fdir_pattern',
    inlined from 'i40e_flow_parse_fdir_filter' at
../drivers/net/i40e/i40e_flow.c:3274:8:
../drivers/net/i40e/i40e_flow.c:3052:69: warning: writing 1 byte into a region
of size 0 [-Wstringop-overflow=]
 3052 |                                 filter->input.flow_ext.flexbytes[j] =
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
 3053 |                                         raw_spec->pattern[i];
      |                                         ~~~~~~~~~~~~~~~~~~~~
In file included from ../drivers/net/i40e/i40e_flow.c:25:
../drivers/net/i40e/i40e_flow.c: In function 'i40e_flow_parse_fdir_filter':
../drivers/net/i40e/i40e_ethdev.h:628:17: note: at offset [17, 271] into
destination object 'flexbytes' of size 16
  628 |         uint8_t flexbytes[RTE_ETH_FDIR_MAX_FLEXLEN];
      |                 ^~~~~~~~~
In function 'i40e_flow_parse_fdir_pattern',
    inlined from 'i40e_flow_parse_fdir_filter' at
../drivers/net/i40e/i40e_flow.c:3274:8:
../drivers/net/i40e/i40e_flow.c:3054:69: warning: writing 1 byte into a region
of size 0 [-Wstringop-overflow=]
 3054 |                                 filter->input.flow_ext.flex_mask[j] =
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
 3055 |                                         raw_mask->pattern[i];
      |                                         ~~~~~~~~~~~~~~~~~~~~
In file included from ../drivers/net/i40e/i40e_flow.c:25:
../drivers/net/i40e/i40e_flow.c: In function 'i40e_flow_parse_fdir_filter':
../drivers/net/i40e/i40e_ethdev.h:630:17: note: at offset [17, 271] into
destination object 'flex_mask' of size 16
  630 |         uint8_t flex_mask[I40E_FDIR_MAX_FLEX_LEN];
      |                 ^~~~~~~~~
[2422/2422] Linking target app/test/dpdk-test

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