ebpfOptions.h

/*
 * SPDX-FileCopyrightText: 2013 Barefoot Networks, Inc.
 * Copyright 2013-present Barefoot Networks, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef BACKENDS_EBPF_EBPFOPTIONS_H_
#define BACKENDS_EBPF_EBPFOPTIONS_H_
 
#include "frontends/common/options.h"
 
namespace P4 {
 
enum XDP2TC { XDP2TC_NONE, XDP2TC_META, XDP2TC_HEAD, XDP2TC_CPUMAP };
 
class EbpfOptions : public CompilerOptions {
 public:
    std::filesystem::path outputFile;
    bool loadIRFromJson = false;
    bool emitExterns = false;
    bool emitTraceMessages = false;
    bool generateToXDP = false;
    enum XDP2TC xdp2tcMode = XDP2TC_NONE;
    unsigned int maxTernaryMasks = 128;
    bool enableTableCache = false;
 
    EbpfOptions();
 
    void calculateXDP2TCMode() {
        if (arch != "psa") {
            return;
        }
 
        if (generateToXDP && xdp2tcMode == XDP2TC_META) {
            std::cerr
                << "XDP2TC 'meta' mode cannot be used if XDP is enabled. "
                   "Falling back to 'head' mode. For more information see "
                   "https://github.com/p4lang/p4c/blob/main/backends/ebpf/psa/README.md#xdp2tc-mode"
                << std::endl;
            xdp2tcMode = XDP2TC_HEAD;
        } else if (generateToXDP && xdp2tcMode == XDP2TC_NONE) {
            // use 'head' mode by default; it's the safest option.
            std::cout << "Setting XDP2TC 'head' mode by default for XDP-based hook." << std::endl;
            xdp2tcMode = XDP2TC_HEAD;
        } else if (!generateToXDP && xdp2tcMode == XDP2TC_NONE) {
            std::cout << "Setting XDP2TC 'meta' mode by default for TC-based hook." << std::endl;
            // For TC, use 'meta' mode by default.
            xdp2tcMode = XDP2TC_META;
        }
        BUG_CHECK(xdp2tcMode != XDP2TC_NONE, "xdp2tc mode should not be set to NONE, bug?");
    }
};
 
using EbpfContext = P4CContextWithOptions<EbpfOptions>;
 
}  // namespace P4
 
#endif /* BACKENDS_EBPF_EBPFOPTIONS_H_ */