[DTrace-devel] [PATCH v2 17/20] doc: Add IP provider documentation
Eugene Loh
eugene.loh at oracle.com
Thu Oct 9 22:28:48 UTC 2025
On 10/9/25 17:45, Kris Van Hees wrote:
> On Thu, Oct 09, 2025 at 05:00:06PM -0400, Eugene Loh wrote:
>> Hmm, just to clarify... you mean pull this patch out of the patch series so
>> that it can be applied independently of the other fixes?
> Ah yes, I didn't realize it was part of the 20-patch series. I think it was
> an independent patch in its v1 form?
Right.
> If so, I prpbably was thinking about that.
>
> OK - let's keep it as part of the series and it will go in with it.
Sounds great.
>> On 10/9/25 13:03, Kris Van Hees wrote:
>>> This patch does not apply cleanly to dev-queue. Can you look into that and
>>> post a v3 (keeping the R-b)?
>>>
>>> On Fri, Sep 26, 2025 at 03:05:54PM -0400, eugene.loh at oracle.com wrote:
>>>> From: Eugene Loh <eugene.loh at oracle.com>
>>>>
>>>> Signed-off-by: Eugene Loh <eugene.loh at oracle.com>
>>>> Reviewed-by: Alan Maguire <alan.maguire at oracle.com>
>>>> ---
>>>> doc/userguide/index.md | 10 +
>>>> doc/userguide/reference/dtrace_providers.md | 2 +
>>>> .../reference/dtrace_providers_ip.md | 174 ++++++++++++++++++
>>>> 3 files changed, 186 insertions(+)
>>>> create mode 100644 doc/userguide/reference/dtrace_providers_ip.md
>>>>
>>>> diff --git a/doc/userguide/index.md b/doc/userguide/index.md
>>>> index f3d96a4d6..18b9bcd68 100644
>>>> --- a/doc/userguide/index.md
>>>> +++ b/doc/userguide/index.md
>>>> @@ -208,6 +208,16 @@
>>>> - [fileinfo\_t](reference/dtrace_providers_io.md#fileinfo_t)
>>>> - [io Examples](reference/dtrace_providers_io.md#io-examples)
>>>> - [io Stability](reference/dtrace_providers_io.md#io-stability)
>>>> + - [IP Provider](reference/dtrace_providers_ip.md)
>>>> + - [ip Probes](reference/dtrace_providers_ip.md#ip-probes)
>>>> + - [ip Probe Arguments](reference/dtrace_providers_ip.md#ip-probe-arguments)
>>>> + - [pktinfo\_t](reference/dtrace_providers_ip.md#pktinfo_t)
>>>> + - [csinfo\_t](reference/dtrace_providers_ip.md#csinfo_t)
>>>> + - [ipinfo\_t](reference/dtrace_providers_ip.md#ipinfo_t)
>>>> + - [ifinfo\_t](reference/dtrace_providers_ip.md#ifinfo_t)
>>>> + - [ipv4info\_t](reference/dtrace_providers_ip.md#ipv4info_t)
>>>> + - [ipv6info\_t](reference/dtrace_providers_ip.md#ipv6info_t)
>>>> + - [ip Stability](reference/dtrace_providers_ip.md#ip-stability)
>>>> - [Lockstat Provider](reference/dtrace_providers_lockstat.md)
>>>> - [lockstat Probes](reference/dtrace_providers_lockstat.md#lockstat-probes)
>>>> - [lockstat Probe Arguments](reference/dtrace_providers_lockstat.md#lockstat-probe-arguments)
>>>> diff --git a/doc/userguide/reference/dtrace_providers.md b/doc/userguide/reference/dtrace_providers.md
>>>> index 9f64935c6..54a018d5c 100644
>>>> --- a/doc/userguide/reference/dtrace_providers.md
>>>> +++ b/doc/userguide/reference/dtrace_providers.md
>>>> @@ -11,6 +11,8 @@ The `dtrace` provider includes several probes that are specific to DTrace itself
>>>> The `fbt` \(Function Boundary Tracing\) provider includes probes that are associated with the entry to and return from most functions in the Linux kernel. Therefore, there could be tens of thousands of `fbt` probes.
>>>> - **[IO Provider](../reference/dtrace_providers_io.md)**
>>>> The `io` provider makes available probes that relate to data input and output.
>>>> +- **[IP Provider](../reference/dtrace_providers_ip.md)**
>>>> +The `ip` provider provides probes that can be used to study IP traffic.
>>>> - **[Lockstat Provider](../reference/dtrace_providers_lockstat.md)**
>>>> The `lockstat` provider provides probes that can be used to study lock usage and contention.
>>>> - **[Pid Provider](../reference/dtrace_providers_pid.md)**
>>>> diff --git a/doc/userguide/reference/dtrace_providers_ip.md b/doc/userguide/reference/dtrace_providers_ip.md
>>>> new file mode 100644
>>>> index 000000000..4e6c47fb2
>>>> --- /dev/null
>>>> +++ b/doc/userguide/reference/dtrace_providers_ip.md
>>>> @@ -0,0 +1,174 @@
>>>> +
>>>> +# IP Provider
>>>> +
>>>> +The `ip` provider makes available a probe at IP send operations in the system and a probe at receive.
>>>> +
>>>> +**Parent topic:**[DTrace Provider Reference](../reference/dtrace_providers.md)
>>>> +
>>>> +## ip Probes
>>>> +
>>>> +The `ip` provider provides one probe for IP sends and another for IP receives.
>>>> +The module name is always `vmlinux` and the function name is empty.
>>>> +
>>>> +## ip Probe Arguments
>>>> +
>>>> +The following table lists the argument types for both the `send` and `receive` probes.
>>>> +
>>>> +| arg | type |
>>>> +| :--- | :--- |
>>>> +| `args[0]` | `pktinfo_t *` |
>>>> +| `args[1]` | `csinfo_t *` |
>>>> +| `args[2]` | `ipinfo_t *` |
>>>> +| `args[3]` | `ifinfo_t *` |
>>>> +| `args[4]` | `ipv4info_t *` |
>>>> +| `args[5]` | `ipv6sinfo_t *` |
>>>> +
>>>> +### pktinfo\_t
>>>> +
>>>> +The `pktinfo_t` structure is an abstraction that describes a packet.
>>>> +Detailed information about this data structure can be found in
>>>> +`/usr/lib64/dtrace/*version*/ip.d` or
>>>> +`/usr/lib64/dtrace/*version*/net.d`, depending on `dtrace` version.
>>>> +The definition of `pktinfo_t` is as follows:
>>>> +
>>>> +```nocopybutton
>>>> +typedef struct pktinfo {
>>>> + uintptr_t pkt_addr;
>>>> +} pktinfo_t;
>>>> +```
>>>> +
>>>> +**Note:**
>>>> +
>>>> +DTrace translates the members of `pktinfo_t` from the `struct sk_buff *`.
>>>> +
>>>> +### csinfo\_t
>>>> +
>>>> +The `csinfo_t` structure is an abstraction that describes connection state.
>>>> +Detailed information about this data structure can be found in
>>>> +`/usr/lib64/dtrace/*version*/ip.d` or
>>>> +`/usr/lib64/dtrace/*version*/net.d`, depending on `dtrace` version.
>>>> +The definition of `csinfo_t` is as follows:
>>>> +
>>>> +```nocopybutton
>>>> +typedef struct csinfo {
>>>> + uintptr_t cs_addr;
>>>> + uint64_t cs_cid;
>>>> +} csinfo_t;
>>>> +```
>>>> +
>>>> +**Note:**
>>>> +
>>>> +DTrace translates the members of `csinfo_t` from the `struct sock *`.
>>>> +
>>>> +### ipinfo\_t
>>>> +
>>>> +The `ipinfo_t` structure contains common IP info for both IPv4 and IPv6.
>>>> +Detailed information about this data structure can be found in `/usr/lib64/dtrace/*version*/ip.d`.
>>>> +The definition of `ipinfo_t` is as follows:
>>>> +
>>>> +```nocopybutton
>>>> +typedef struct ipinfo {
>>>> + uint8_t ip_ver; /* IP version (4, 6) */
>>>> + uint32_t ip_plength; /* payload length */
>>>> + string ip_saddr; /* source address */
>>>> + string ip_daddr; /* destination address */
>>>> +} ipinfo_t;
>>>> +```
>>>> +
>>>> +**Note:**
>>>> +
>>>> +DTrace translates the members of `ipinfo_t` from, variously,
>>>> +`struct iphdr *`, `struct ipv6hdr *`, or `void_ip_t *`.
>>>> +
>>>> +### ifinfo\_t
>>>> +
>>>> +The `ifinfo_t` structure contains network interface info.
>>>> +Detailed information about this data structure can be found in `/usr/lib64/dtrace/*version*/ip.d`.
>>>> +The definition of `ifinfo_t` is as follows:
>>>> +
>>>> +```nocopybutton
>>>> +typedef struct ifinfo {
>>>> + string if_name; /* interface name */
>>>> + int8_t if_local; /* is delivered locally */
>>>> + netstackid_t if_ipstack; /* netns pointer on Linux */
>>>> + uintptr_t if_addr; /* pointer to raw struct net_device */
>>>> +} ifinfo_t;
>>>> +```
>>>> +
>>>> +**Note:**
>>>> +
>>>> +DTrace translates the members of `ifinfo_t` from a `struct net_device *`.
>>>> +
>>>> +### ipv4info\_t
>>>> +
>>>> +The `ipv4info_t` structure is translated version of the IPv4 header
>>>> +(with raw pointer).
>>>> +These values are NULL if the packet is not IPv4.
>>>> +Detailed information about this data structure can be found in `/usr/lib64/dtrace/*version*/ip.d`.
>>>> +The definition of `ipv4info_t` is as follows:
>>>> +
>>>> +```nocopybutton
>>>> +typedef struct ipv4info {
>>>> + uint8_t ipv4_ver; /* IP version (4) */
>>>> + uint8_t ipv4_ihl; /* header length, bytes */
>>>> + uint8_t ipv4_tos; /* type of service field */
>>>> + uint16_t ipv4_length; /* length (header + payload) */
>>>> + uint16_t ipv4_ident; /* identification */
>>>> + uint8_t ipv4_flags; /* IP flags */
>>>> + uint16_t ipv4_offset; /* fragment offset */
>>>> + uint8_t ipv4_ttl; /* time to live */
>>>> + uint8_t ipv4_protocol; /* next level protocol */
>>>> + string ipv4_protostr; /* next level protocol, as string */
>>>> + uint16_t ipv4_checksum; /* header checksum */
>>>> + ipaddr_t ipv4_src; /* source address */
>>>> + ipaddr_t ipv4_dst; /* destination address */
>>>> + string ipv4_saddr; /* source address, string */
>>>> + string ipv4_daddr; /* destination address, string */
>>>> + struct iphdr *ipv4_hdr; /* pointer to raw header */
>>>> +} ipv4info_t;
>>>> +```
>>>> +
>>>> +**Note:**
>>>> +
>>>> +DTrace translates the members of `ipv4info_t` from a `struct iphdr *`.
>>>> +
>>>> +### ipv6info\_t
>>>> +
>>>> +The `ipv6info_t` structure is translated version of the IPv6 header
>>>> +(with raw pointer).
>>>> +These values are NULL if the packet is not IPv6.
>>>> +Detailed information about this data structure can be found in `/usr/lib64/dtrace/*version*/ip.d`.
>>>> +The definition of `ipv6info_t` is as follows:
>>>> +
>>>> +```nocopybutton
>>>> +typedef struct ipv6info {
>>>> + uint8_t ipv6_ver; /* IP version (6) */
>>>> + uint8_t ipv6_tclass; /* traffic class */
>>>> + uint32_t ipv6_flow; /* flow label */
>>>> + uint16_t ipv6_plen; /* payload length */
>>>> + uint8_t ipv6_nexthdr; /* next header protocol */
>>>> + string ipv6_nextstr; /* next header protocol, as string */
>>>> + uint8_t ipv6_hlim; /* hop limit */
>>>> + in6_addr_t *ipv6_src; /* source address */
>>>> + in6_addr_t *ipv6_dst; /* destination address */
>>>> + string ipv6_saddr; /* source address, string */
>>>> + string ipv6_daddr; /* destination address, string */
>>>> + struct ipv6hdr *ipv6_hdr; /* pointer to raw header */
>>>> +} ipv6info_t;
>>>> +```
>>>> +
>>>> +**Note:**
>>>> +
>>>> +DTrace translates the members of `ipv6info_t` from a `struct ipv6hdr *`.
>>>> +
>>>> +## ip Stability
>>>> +
>>>> +The `ip` provider uses DTrace's stability mechanism to describe its stabilities. These stability values are listed in the following table.
>>>> +
>>>> +| Element | Name Stability | Data Stability | Dependency Class |
>>>> +| :--- | :--- | :--- | :--- |
>>>> +| Provider | Evolving | Evolving | ISA |
>>>> +| Module | Private | Private | Unknown |
>>>> +| Function | Private | Private | Unknown |
>>>> +| Name | Evolving | Evolving | ISA |
>>>> +| Arguments | Evolving | Evolving | ISA |
>>>> --
>>>> 2.47.3
>>>>
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