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Subject: [DPDK/ethdev Bug 1709] net/mlx5 warnings when build with lto
Date: Wed, 21 May 2025 15:20:35 +0000
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--17478408340.1EAeE70ea.2314293
Date: Wed, 21 May 2025 17:20:34 +0200
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https://bugs.dpdk.org/show_bug.cgi?id=3D1709

            Bug ID: 1709
           Summary: net/mlx5 warnings when build with lto
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: stephen@networkplumber.org
  Target Milestone: ---

Suspect that temporary buffer may not be big enough.
LTO enables more inlining and therefore more bounds checking.

[3511/3591] Linking target drivers/librte_net_mlx5.so.25.2

In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [76, 52423=
6]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [84, 52424=
4]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [92, 52425=
2]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [100, 5242=
60]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [108, 5242=
68]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [116, 5242=
76]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [124, 5242=
84]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^

--=20
You are receiving this mail because:
You are the assignee for the bug.=

--17478408340.1EAeE70ea.2314293
Date: Wed, 21 May 2025 17:20:34 +0200
MIME-Version: 1.0
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Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://bugs.dpdk.org/
Auto-Submitted: auto-generated
X-Auto-Response-Suppress: All

<html>
    <head>
      <base href=3D"https://bugs.dpdk.org/">
    </head>
    <body><table border=3D"1" cellspacing=3D"0" cellpadding=3D"8" class=3D"=
bz_new_table">
        <tr>
          <th>Bug ID</th>
          <td><a class=3D"bz_bug_link=20
          bz_status_UNCONFIRMED "
   title=3D"UNCONFIRMED - net/mlx5 warnings when build with lto"
   href=3D"https://bugs.dpdk.org/show_bug.cgi?id=3D1709">1709</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>net/mlx5 warnings when build with lto
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DPDK
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>ethdev
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>dev&#64;dpdk.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>stephen&#64;networkplumber.org
          </td>
        </tr>

        <tr>
          <th>Target Milestone</th>
          <td>---
          </td>
        </tr></table>
      <p>
        <div class=3D"bz_comment_block">
          <pre class=3D"bz_comment_text">Suspect that temporary buffer may =
not be big enough.
LTO enables more inlining and therefore more bounds checking.

[3511/3591] Linking target drivers/librte_net_mlx5.so.25.2

In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [76, 52423=
6]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [84, 52424=
4]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [92, 52425=
2]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [100, 5242=
60]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [108, 5242=
68]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [116, 5242=
76]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
In function =E2=80=98mlx5dr_action_prepare_decap_l3_data=E2=80=99,
    inlined from =E2=80=98mlx5dr_action_handle_tunnel_l3_to_l2=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2151:3,
    inlined from =E2=80=98mlx5dr_action_create_reformat_hws=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2221:9,
    inlined from =E2=80=98mlx5dr_action_create_reformat=E2=80=99 at
../drivers/net/mlx5/hws/mlx5dr_action.c:2278:8:
../drivers/net/mlx5/hws/mlx5dr_action.c:3630:17: warning: writing 4 bytes i=
nto
a region of size 0 [-Wstringop-overflow=3D]
 3630 |                 memcpy(dst, e_src, MLX5DR_ACTION_INLINE_DATA_SIZE);=
 /*
data */
      |                 ^
../drivers/net/mlx5/hws/mlx5dr_action.c: In function
=E2=80=98mlx5dr_action_create_reformat=E2=80=99:
../drivers/net/mlx5/hws/mlx5dr_action.c:2131:17: note: at offset [124, 5242=
84]
into destination object =E2=80=98mh_data=E2=80=99 of size 64
 2131 |         uint8_t mh_data[MLX5DR_ACTION_REFORMAT_DATA_SIZE] =3D {0};
      |                 ^
          </pre>
        </div>
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