Upstream the script thats used to generate patch for AST2700 by chander-nexthop · Pull Request #568 · sonic-net/sonic-linux-kernel

chander-nexthop · 2026-05-07T08:30:17Z

As discussed in the SONiC-BMC work group meeting yesterday I am submitting the script that I use to generate the patch file to add support for AST 2700 to the SONiC Linux Kernel. The script by default will create the patch based on the current top-of-tree in aspeed-master-v6.12. This can be overridded by running the script with the env var ASPEED_TAG, ex "ASPEED_TAG=v00.07.02 ./scripts/generate-aspeed-patch.sh"

… 2700 2. Script to generate the patch that adds support for Aspeed AST2700 SOC. The script will generate the patch in WORK_DIR/aspeed-ast2700-support-new.patch This needs to be moved to patches-sonic/aspeed-ast2700-support.patch. Signed-off-by: Chandrasekaran Swaminathan <chander@nexthop.ai>

mssonicbld · 2026-05-07T08:30:25Z

/azp run

azure-pipelines · 2026-05-07T08:30:36Z

Azure Pipelines successfully started running 1 pipeline(s).

paulmenzel · 2026-05-07T08:33:48Z

Thank you for sharing the script. Please make this two merge/pull requests.

Signed-off-by: Chandrasekaran Swaminathan <chander@nexthop.ai>

mssonicbld · 2026-05-07T08:38:45Z

/azp run

azure-pipelines · 2026-05-07T08:39:00Z

Azure Pipelines successfully started running 1 pipeline(s).

chander-nexthop · 2026-05-07T08:39:24Z

Thank you for sharing the script. Please make this two merge/pull requests.

Done.

saiarcot895 · 2026-05-12T02:39:35Z

+    else
+        echo "Warning: Patch file not found: $line"
+    fi
+done < <(head -228 "$KERNEL_DIR/patches-sonic/series")


Why the first 228 lines specifically?

Thank you @saiarcot895 for pointing it out . It a hardcoded cutoff for the pre aspeed section of the series file . it is replaced in the latest commit with an aspeed section skip so it adapts as patches are added or reordered.

saiarcot895 · 2026-05-12T02:40:14Z

+cat > "$WORK_DIR/smart_merge.py" << 'PYTHON_EOF'
+#!/usr/bin/env python3
+"""
+Smart merge for Kconfig/Makefile files.
+Uses a common ancestor approach: extract Aspeed additions from diff,
+add them to SONiC base at correct locations while preserving order.
+"""
+import sys
+import re
+import difflib
+
+def smart_merge(sonic_file, aspeed_file, target_file):
+    # Aspeed-related patterns
+    aspeed_patterns = [
+        re.compile(r'aspeed', re.IGNORECASE),
+        re.compile(r'ast2[567]00', re.IGNORECASE),
+        re.compile(r'ast1[78]00', re.IGNORECASE),
+        re.compile(r'AST2700_IRQ'),
+        re.compile(r'ARCH_ASPEED'),
+    ]
+
+    def is_aspeed_related(text):
+        return any(pattern.search(text) for pattern in aspeed_patterns)
+
+    # Read files
+    with open(sonic_file, 'r') as f:
+        sonic_lines = f.readlines()
+
+    with open(aspeed_file, 'r') as f:
+        aspeed_lines = f.readlines()
+
+    # Use difflib to get a proper sequence matcher
+    matcher = difflib.SequenceMatcher(None, sonic_lines, aspeed_lines)
+
+    result = []
+
+    for tag, i1, i2, j1, j2 in matcher.get_opcodes():
+        if tag == 'equal':
+            # Common lines - keep them
+            result.extend(sonic_lines[i1:i2])
+        elif tag == 'delete':
+            # Lines deleted in aspeed - KEEP THEM (preserve SONiC content)
+            result.extend(sonic_lines[i1:i2])
+        elif tag == 'insert':
+            # Lines added in aspeed - check if Aspeed-related
+            new_lines = aspeed_lines[j1:j2]
+            aspeed_related = any(is_aspeed_related(line) for line in new_lines)
+            if aspeed_related:
+                # Add these lines
+                result.extend(new_lines)
+            # Otherwise skip (non-Aspeed additions)
+        elif tag == 'replace':
+            # Lines changed - keep SONiC version, then add Aspeed additions if any
+            result.extend(sonic_lines[i1:i2])
+            new_lines = aspeed_lines[j1:j2]
+            aspeed_related = any(is_aspeed_related(line) for line in new_lines)
+            if aspeed_related:
+                # Also add the Aspeed replacements
+                result.extend(new_lines)
+
+    # Write result
+    with open(target_file, 'w') as f:
+        f.writelines(result)
+
+if __name__ == '__main__':
+    smart_merge(sys.argv[1], sys.argv[2], sys.argv[3])
+PYTHON_EOF


Suggestion for the future: split this into a separate file just for editing/review purposes.

it is taken care @saiarcot895 . extracted into scripts/smart_merge.py now. Thank you.

mssonicbld · 2026-05-12T15:21:33Z

/azp run

azure-pipelines · 2026-05-12T15:21:45Z

Azure Pipelines successfully started running 1 pipeline(s).

paulmenzel

700 lines is quite much. Why can’t nexthop not publish a git repository with the all the SONiC patches applied, and the Aspeed patches on top? (SONiC should also publish it’s own Linux kernel git archive with the patches applied.)

paulmenzel · 2026-05-12T17:22:34Z

+# Example, run with ASPEED_TAG=v00.07.02 ./scripts/generate-aspeed-patch.sh
+ASPEED_BRANCH="${ASPEED_TAG:-aspeed-master-v6.12}"
+ASPEED_REPO="https://github.com/AspeedTech-BMC/linux.git"
+WORK_DIR="/tmp/aspeed-patch-gen"


Please consider $TMPDIR.

Thank you @paulmenzel for the feedback. review comment incorporated .

paulmenzel · 2026-05-12T17:28:11Z

+OUTPUT_PATCH="$WORK_DIR/aspeed-ast2700-support-new.patch"
+
+# Read kernel version from Makefile
+KERNEL_VERSION=$(grep "^KERNEL_VERSION" "$KERNEL_DIR/Makefile" | cut -d= -f2 | tr -d ' ')


sed -n 's/^KERNEL_VERSION\s*=\s*//p' "$KERNEL_DIR/Makefile"

KERNEL_VERSION ?= 6.12.41

A literal = regex doesnt match ?=, so the variable would expand to empty and break the rest of the script. I generalized the pattern. Thank you for feedback .

paulmenzel · 2026-05-12T17:29:32Z

+fi
+mkdir -p "$SONIC_SRC"
+cd "$SONIC_SRC"
+wget -q "$SONIC_KERNEL_URL"


Why redownload it each time?

Tarball is now cached . Thank you.

paulmenzel · 2026-05-12T17:30:52Z

+wget -q "$SONIC_KERNEL_URL"
+tar -xf "linux_${KERNEL_VERSION}.orig.tar.xz" --strip-components=1
+rm "linux_${KERNEL_VERSION}.orig.tar.xz"
+echo "SONiC kernel source ready: $(du -sh $SONIC_SRC | cut -f1)"


Explicitly mention the size?

Explicitly mentioned the size now. Thank you.

- Updated patch series file to move ASPEED patches at the end - Move inline smart_merge Python out of the bash heredoc into scripts/smart_merge.py; bash invokes it via $SMART_MERGE. - Replace the hard-coded "head -228" cap with a break at the "###-> aspeed" marker so the patch-application loop stays correct as patches-sonic/series evolves. - Warn patches listed after "###-> aspeed-end" with a note that they may need regeneration if they touch files also modified by the regenerated aspeed patch. Signed-off-by: Chinmoy Dey <chinmoy@nexthop.ai>

mssonicbld · 2026-05-19T09:16:34Z

/azp run

azure-pipelines · 2026-05-19T09:16:41Z

Azure Pipelines will not run the associated pipelines, because the pull request was updated after the run command was issued. Review the pull request again and issue a new run command.

- WORK_DIR now honors ${TMPDIR:-/tmp}. - KERNEL_VERSION read via sed (handles ?= / := / += / =). - SONiC kernel tarball is cached across runs; only the extracted $SONIC_SRC tree is wiped and re-extracted each time. - progress lines now label the "size on disk" figure explicitly. Merge remote-tracking branch 'upstream/master' into chander-ast2700-patch-script Signed-off-by: Chinmoy Dey <chinmoy@nexthop.ai>

mssonicbld · 2026-05-19T11:37:59Z

/azp run

azure-pipelines · 2026-05-19T11:38:09Z

Azure Pipelines successfully started running 1 pipeline(s).

chander-nexthop added 2 commits May 7, 2026 08:19

Merge branch 'master' into chander-ast2700-patch-script

be17d98

chander-nexthop requested a review from a team as a code owner May 7, 2026 08:30

Revert the change to the options. Will raise a separate PR

28506e6

Signed-off-by: Chandrasekaran Swaminathan <chander@nexthop.ai>

chander-nexthop changed the title ~~Fix an unwanted option and upstream the script thats used to generate patch for AST2700~~ Upstream the script thats used to generate patch for AST2700 May 7, 2026

saiarcot895 reviewed May 12, 2026

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paulmenzel suggested changes May 12, 2026

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chinmoy-nexthop force-pushed the chander-ast2700-patch-script branch from df0c469 to 5e82787 Compare May 19, 2026 09:16

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