From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- samples/pktgen/parameters.sh | 139 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 139 insertions(+) create mode 100644 samples/pktgen/parameters.sh (limited to 'samples/pktgen/parameters.sh') diff --git a/samples/pktgen/parameters.sh b/samples/pktgen/parameters.sh new file mode 100644 index 000000000..81906f199 --- /dev/null +++ b/samples/pktgen/parameters.sh @@ -0,0 +1,139 @@ +# +# SPDX-License-Identifier: GPL-2.0 +# Common parameter parsing for pktgen scripts +# + +function usage() { + echo "" + echo "Usage: $0 [-vx] -i ethX" + echo " -i : (\$DEV) output interface/device (required)" + echo " -s : (\$PKT_SIZE) packet size" + echo " -d : (\$DEST_IP) destination IP. CIDR (e.g. 198.18.0.0/15) is also allowed" + echo " -m : (\$DST_MAC) destination MAC-addr" + echo " -p : (\$DST_PORT) destination PORT range (e.g. 433-444) is also allowed" + echo " -k : (\$UDP_CSUM) enable UDP tx checksum" + echo " -t : (\$THREADS) threads to start" + echo " -f : (\$F_THREAD) index of first thread (zero indexed CPU number)" + echo " -c : (\$SKB_CLONE) SKB clones send before alloc new SKB" + echo " -n : (\$COUNT) num messages to send per thread, 0 means indefinitely" + echo " -b : (\$BURST) HW level bursting of SKBs" + echo " -v : (\$VERBOSE) verbose" + echo " -x : (\$DEBUG) debug" + echo " -6 : (\$IP6) IPv6" + echo " -w : (\$DELAY) Tx Delay value (ns)" + echo " -a : (\$APPEND) Script will not reset generator's state, but will append its config" + echo "" +} + +## --- Parse command line arguments / parameters --- +## echo "Commandline options:" +while getopts "s:i:d:m:p:f:t:c:n:b:w:vxh6ak" option; do + case $option in + i) # interface + export DEV=$OPTARG + info "Output device set to: DEV=$DEV" + ;; + s) + export PKT_SIZE=$OPTARG + info "Packet size set to: PKT_SIZE=$PKT_SIZE bytes" + ;; + d) # destination IP + export DEST_IP=$OPTARG + info "Destination IP set to: DEST_IP=$DEST_IP" + ;; + m) # MAC + export DST_MAC=$OPTARG + info "Destination MAC set to: DST_MAC=$DST_MAC" + ;; + p) # PORT + export DST_PORT=$OPTARG + info "Destination PORT set to: DST_PORT=$DST_PORT" + ;; + f) + export F_THREAD=$OPTARG + info "Index of first thread (zero indexed CPU number): $F_THREAD" + ;; + t) + export THREADS=$OPTARG + info "Number of threads to start: $THREADS" + ;; + c) + export CLONE_SKB=$OPTARG + info "CLONE_SKB=$CLONE_SKB" + ;; + n) + export COUNT=$OPTARG + info "COUNT=$COUNT" + ;; + b) + export BURST=$OPTARG + info "SKB bursting: BURST=$BURST" + ;; + w) + export DELAY=$OPTARG + info "DELAY=$DELAY" + ;; + v) + export VERBOSE=yes + info "Verbose mode: VERBOSE=$VERBOSE" + ;; + x) + export DEBUG=yes + info "Debug mode: DEBUG=$DEBUG" + ;; + 6) + export IP6=6 + info "IP6: IP6=$IP6" + ;; + a) + export APPEND=yes + info "Append mode: APPEND=$APPEND" + ;; + k) + export UDP_CSUM=yes + info "UDP tx checksum: UDP_CSUM=$UDP_CSUM" + ;; + h|?|*) + usage; + err 2 "[ERROR] Unknown parameters!!!" + esac +done +shift $(( $OPTIND - 1 )) + +if [ -z "$PKT_SIZE" ]; then + # NIC adds 4 bytes CRC + export PKT_SIZE=60 + info "Default packet size set to: set to: $PKT_SIZE bytes" +fi + +if [ -z "$F_THREAD" ]; then + # First thread (F_THREAD) reference the zero indexed CPU number + export F_THREAD=0 +fi + +if [ -z "$THREADS" ]; then + export THREADS=1 +fi + +# default DELAY +[ -z "$DELAY" ] && export DELAY=0 # Zero means max speed + +export L_THREAD=$(( THREADS + F_THREAD - 1 )) + +if [ -z "$DEV" ]; then + usage + err 2 "Please specify output device" +fi + +if [ -z "$DST_MAC" ]; then + warn "Missing destination MAC address" +fi + +if [ -z "$DEST_IP" ]; then + warn "Missing destination IP address" +fi + +if [ ! -d /proc/net/pktgen ]; then + info "Loading kernel module: pktgen" + modprobe pktgen +fi -- cgit v1.3.1