The qede PMD stopped working under Ubuntu-24.04 (using gcc-13) when compiled with -O3 (default level for all DPDK code). A bug is opened for this issue (see Link). The same issue is also seen with gcc-12 and gcc-14. The issue is not seen with clang-20.
A first workaround is to just disable all optimizations (-O0), which restores packet Rx with Qlogic NICs. However, the performance impact is not acceptable (around 50% drop). A better compromise is to use -O1 for the qede PMD: - there is some perf impact, - but the PMD is working as expected (packets are correctly received). When compiling with both -O2 and -O3 and gcc > 11, there is no packet reception when using the qede PMD. The root cause could be missing 'volatile' keywords or missing memory barriers in the qede PMD code. Link: https://bugs.dpdk.org/show_bug.cgi?id=1379 Signed-off-by: Thierry Herbelot <thierry.herbe...@6wind.com> --- V2: be more precise when dropping optimization level (only for gcc > 11) V3: even more precise: the issue appears with gcc-12 --- drivers/net/qede/base/meson.build | 4 ++++ drivers/net/qede/meson.build | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/drivers/net/qede/base/meson.build b/drivers/net/qede/base/meson.build index a6dad3ec7bcc..acab6e8ac938 100644 --- a/drivers/net/qede/base/meson.build +++ b/drivers/net/qede/base/meson.build @@ -55,3 +55,7 @@ foreach flag: error_cflags base_cflags += flag endif endforeach +# no packet Rx with gcc > 11 with compiling with default -O3 or -O2 +if (cc.get_id() == 'gcc' and cc.version().version_compare('>=12.0')) + base_cflags += '-O1' +endif diff --git a/drivers/net/qede/meson.build b/drivers/net/qede/meson.build index e1b21d6ff5cd..86c3503a82f6 100644 --- a/drivers/net/qede/meson.build +++ b/drivers/net/qede/meson.build @@ -22,3 +22,7 @@ sources = files( if cc.has_argument('-Wno-format-nonliteral') cflags += '-Wno-format-nonliteral' endif +# no packet Rx with gcc > 11 with compiling with default -O3 or -O2 +if (cc.get_id() == 'gcc' and cc.version().version_compare('>=12.0')) + cflags += '-O1' +endif -- 2.39.2
