Support for DPDK applications

src/kernel_abi.h

@@ -1666,6 +1666,55 @@ struct BaseArch : public wordsize,
     ptr<link_map> r_map;
     // More fields we don't need (and are potentially libc specific)
   };
+
+  /* Based on:
+   * - https://github.com/linux-rdma/rdma-core/blob/e336086ec6649fbcace511b54419dcac0ae040b7/libibverbs/cmd_ioctl.h
+   * - https://github.com/torvalds/linux/blob/494c5580aa6721874a6d9d62dac1c94e83e79302/include/uapi/rdma/rdma_user_ioctl_cmds.h
+   *
+   * TODO: Is it possible to use `using` to expose kernel structs in this namespace?
+   */
+  struct ib_uverbs_attr {
+    uint16_t attr_id;  /* command specific type attribute */
+    uint16_t len;  /* only for pointers and IDRs array */
+    uint16_t flags;  /* combination of UVERBS_ATTR_F_XXXX */
+    union {
+      struct {
+        uint8_t elem_id;
+        uint8_t reserved;
+      } enum_data;
+      uint16_t reserved;
+    } attr_data;
+    union {
+      /*
+      * ptr to command, inline data, idr/fd or
+      * ptr to __u32 array of IDRs
+      */
+      uint64_t __attribute__((aligned(8))) data;
+      /* Used by FD_IN and FD_OUT */
+      int64_t data_s64;
+    };
+  };
+
+  /* Argument object passed to RDMA_VERBS_IOCTL ioctl request.
+   * NOTE: sizeof(T) will return an incorrect value because of VLA at the end
+   *       of the struct.
+   *
+   * Based on:
+   * - https://github.com/linux-rdma/rdma-core/blob/e336086ec6649fbcace511b54419dcac0ae040b7/libibverbs/cmd_ioctl.h
+   * - https://github.com/torvalds/linux/blob/494c5580aa6721874a6d9d62dac1c94e83e79302/include/uapi/rdma/rdma_user_ioctl_cmds.h
+   *
+   * TODO: Is it possible to use `using` to expose kernel structs in this namespace?
+   */
+  struct ib_uverbs_ioctl_hdr {
+    uint16_t length;
+    uint16_t object_id;
+    uint16_t method_id;
+    uint16_t num_attrs;
+    uint64_t __attribute__((aligned(8)))  reserved1;
+    uint32_t driver_id;
+    uint32_t reserved2;
+    struct ib_uverbs_attr attrs[0];
+  };
 };
 
 struct X64Arch : public BaseArch<SupportedArch::x86_64, WordSize64Defs> {

src/record_syscall.cc

@@ -30,6 +30,7 @@
 #include <linux/videodev2.h>
 #include <linux/wireless.h>
 #include <poll.h>
+#include <rdma/rdma_user_ioctl_cmds.h>
 #include <sched.h>
 #include <scsi/sg.h>
 #include <sound/asound.h>
@@ -1570,6 +1571,14 @@ template <typename Arch> void prepare_ethtool_ioctl(RecordTask* t, TaskSyscallSt
     case ETHTOOL_SPAUSEPARAM:
     case ETHTOOL_SFEATURES:
       break;
+    // Expected EINVAL for 'ioctl' but got result 0 (errno SUCCESS); unknown ETHTOOL command 76
+    case ETHTOOL_GLINKSETTINGS:
+      // TODO(sodar): Handle it somehow?
+      break;
+    // Expected EINVAL for 'ioctl' but got result 0 (errno SUCCESS); unknown ETHTOOL command 29
+    case ETHTOOL_GSTATS:
+      // TODO(sodar): Handle it somehow?
+      break;
     default:
       LOG(debug) << "Unknown ETHTOOL cmd " << cmd;
       syscall_state.expect_errno = EINVAL;
@@ -1746,6 +1755,15 @@ static Switchable prepare_ioctl(RecordTask* t,
       syscall_state.reg_parameter<typename Arch::signed_int>(3);
       return PREVENT_SWITCH;
 
+    /* RDMA_VERBS_IOCTL ioctl request used in libibverbs.
+     * net_mlx5 PMD is linked against libibverbs and these ioctls
+     * are called during probing.
+     */
+    case RDMA_VERBS_IOCTL:
+      // TODO: ioctl argument size is dynamically calculated. How to do this in rr?
+      syscall_state.reg_parameter<typename Arch::ib_uverbs_ioctl_hdr>(3);
+      return PREVENT_SWITCH;
+
     case SG_IO:
       auto argsp = syscall_state.reg_parameter<typename Arch::sg_io_hdr>(3, IN_OUT);
       auto args = t->read_mem(argsp);

src/syscalls.py

@@ -570,7 +570,7 @@ def __init__(self, **kwargs):
 lstat = EmulatedSyscall(x86=107, x64=6, arg2="struct Arch::stat")
 fstat = EmulatedSyscall(x86=108, x64=5, generic=80, arg2="struct Arch::stat")
 olduname = UnsupportedSyscall(x86=109)
-iopl = UnsupportedSyscall(x86=110, x64=172)
+iopl = EmulatedSyscall(x86=110, x64=172)
 vhangup = UnsupportedSyscall(x86=111, x64=153, generic=58)
 idle = UnsupportedSyscall(x86=112)
 vm86old = UnsupportedSyscall(x86=113)