From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
To: Beilei Xing <beilei.xing@intel.com>
Cc: jingjing.wu@intel.com, andrey.chilikin@intel.com, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2 2/6] ethdev: add GTPC and GTPU items
Date: Thu, 7 Sep 2017 14:19:49 +0200 [thread overview]
Message-ID: <20170907121949.GI4301@6wind.com> (raw)
In-Reply-To: <1504783263-20575-3-git-send-email-beilei.xing@intel.com>
Hi Beilei,
I assume this patch supersedes [1]?
[1] http://dpdk.org/ml/archives/dev/2017-August/073501.html
Thanks for merging testpmd and the API change as a single patch, I still
have a few comments, see below.
(please add "flow API" somewhere in the title by the way)
On Thu, Sep 07, 2017 at 07:20:59PM +0800, Beilei Xing wrote:
> This patch adds GTPC and GTPU items to generic rte
> flow, and also exposes the following item fields
> through the flow command:
>
> - GTPC TEID
> - GTPU TEID
>
> Signed-off-by: Beilei Xing <beilei.xing@intel.com>
Won't there be a need to match nonspecific GTP traffic as well (both GTP-C
and GTP-U a once), since they use the same structure?
I'm not familiar with the protocol at all so I wonder if you should maybe
leave the GTP item in addition to those two.
> ---
> app/test-pmd/cmdline_flow.c | 44 +++++++++++++++++++++++++++++
> app/test-pmd/config.c | 2 ++
> doc/guides/prog_guide/rte_flow.rst | 26 +++++++++++++++++
> doc/guides/testpmd_app_ug/testpmd_funcs.rst | 8 ++++++
> lib/librte_ether/rte_flow.h | 44 +++++++++++++++++++++++++++++
> 5 files changed, 124 insertions(+)
>
> diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
> index a17a004..72d159c 100644
> --- a/app/test-pmd/cmdline_flow.c
> +++ b/app/test-pmd/cmdline_flow.c
> @@ -171,6 +171,10 @@ enum index {
> ITEM_GRE_PROTO,
> ITEM_FUZZY,
> ITEM_FUZZY_THRESH,
> + ITEM_GTPC,
> + ITEM_GTPC_TEID,
> + ITEM_GTPU,
> + ITEM_GTPU_TEID,
You could refactor the TEID parameter since they use the same
structure. Might be useful if you add nonspecific GTP:
ITEM_GTP,
ITEM_GTP_TEID,
ITEM_GTPC,
ITEM_GTPU,
>
> /* Validate/create actions. */
> ACTIONS,
> @@ -451,6 +455,8 @@ static const enum index next_item[] = {
> ITEM_MPLS,
> ITEM_GRE,
> ITEM_FUZZY,
> + ITEM_GTPC,
> + ITEM_GTPU,
> ZERO,
> };
>
> @@ -588,6 +594,18 @@ static const enum index item_gre[] = {
> ZERO,
> };
>
> +static const enum index item_gtpc[] = {
> + ITEM_GTPC_TEID,
> + ITEM_NEXT,
> + ZERO,
> +};
> +
> +static const enum index item_gtpu[] = {
> + ITEM_GTPU_TEID,
> + ITEM_NEXT,
> + ZERO,
> +};
A single array is necessary, item_gtp[].
> +
> static const enum index next_action[] = {
> ACTION_END,
> ACTION_VOID,
> @@ -1421,6 +1439,32 @@ static const struct token token_list[] = {
> .args = ARGS(ARGS_ENTRY(struct rte_flow_item_fuzzy,
> thresh)),
> },
> + [ITEM_GTPC] = {
> + .name = "gtpc",
> + .help = "match GTP header",
> + .priv = PRIV_ITEM(GTPC, sizeof(struct rte_flow_item_gtp)),
> + .next = NEXT(item_gtpc),
> + .call = parse_vc,
> + },
> + [ITEM_GTPC_TEID] = {
> + .name = "teid",
> + .help = "TUNNEL ENDPOINT IDENTIFIER",
Please don't shout, "tunnel endpoint identifier" is fine.
> + .next = NEXT(item_gtpc, NEXT_ENTRY(UNSIGNED), item_param),
> + .args = ARGS(ARGS_ENTRY_HTON(struct rte_flow_item_gtp, teid)),
> + },
> + [ITEM_GTPU] = {
> + .name = "gtpu",
> + .help = "match GTP header",
> + .priv = PRIV_ITEM(GTPU, sizeof(struct rte_flow_item_gtp)),
> + .next = NEXT(item_gtpu),
> + .call = parse_vc,
> + },
> + [ITEM_GTPU_TEID] = {
> + .name = "teid",
> + .help = "TUNNEL ENDPOINT IDENTIFIER",
Same comment here, however the a single TEID entry is necessary as
previously described.
> + .next = NEXT(item_gtpu, NEXT_ENTRY(UNSIGNED), item_param),
> + .args = ARGS(ARGS_ENTRY_HTON(struct rte_flow_item_gtp, teid)),
> + },
>
> /* Validate/create actions. */
> [ACTIONS] = {
> diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
> index 3ae3e1c..be4c3b9 100644
> --- a/app/test-pmd/config.c
> +++ b/app/test-pmd/config.c
> @@ -947,6 +947,8 @@ static const struct {
> MK_FLOW_ITEM(MPLS, sizeof(struct rte_flow_item_mpls)),
> MK_FLOW_ITEM(GRE, sizeof(struct rte_flow_item_gre)),
> MK_FLOW_ITEM(FUZZY, sizeof(struct rte_flow_item_fuzzy)),
Remember to add GTP here assuming it makes sense.
> + MK_FLOW_ITEM(GTPC, sizeof(struct rte_flow_item_gtp)),
> + MK_FLOW_ITEM(GTPU, sizeof(struct rte_flow_item_gtp)),
> };
>
> /** Compute storage space needed by item specification. */
> diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
> index 662a912..9e7179a 100644
> --- a/doc/guides/prog_guide/rte_flow.rst
> +++ b/doc/guides/prog_guide/rte_flow.rst
> @@ -955,6 +955,32 @@ Usage example, fuzzy match a TCPv4 packets:
> | 4 | END |
> +-------+----------+
>
> +Item: ``GTPC``
> +^^^^^^^^^^^^^^
> +
> +Matches a GTP header.
> +
> +- ``v_pt_rsv_flags``: version (3b), protocol type (1b), reserved (1b),
> + extension header flag (1b), sequence number flag (1b), N-PDU number
> + flag (1b).
> +- ``msg_type``: message type.
> +- ``msg_len``: message length.
> +- ``teid``: TEID.
> +- Default ``mask`` matches teid only.
> +
> +Item: ``GTPU``
> +^^^^^^^^^^^^^^
> +
> +Matches a GTP header.
> +
> +- ``v_pt_rsv_flags``: version (3b), protocol type (1b), reserved (1b),
> + extension header flag (1b), sequence number flag (1b), N-PDU number
> + flag (1b).
> +- ``msg_type``: message type.
> +- ``msg_len``: message length.
> +- ``teid``: TEID.
> +- Default ``mask`` matches teid only.
> +
You can use a single section to describe all three items at once since they
map to a common structure:
Item: ``GTP``, ``GTPC``, ``GTPU``:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Then elaborate a bit on the the differences between them.
> Actions
> ~~~~~~~
>
> diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> index 2ed62f5..2ca36ad 100644
> --- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> +++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> @@ -2696,6 +2696,14 @@ This section lists supported pattern items and their attributes, if any.
>
> - ``thresh {unsigned}``: accuracy threshold.
>
> +- ``gtpc``: match GTP header.
> +
> + - ``teid {unsigned}``: Tunnel endpoint identifier.
Tunnel => tunnel
> +
> +- ``gtpu``: match GTP header.
> +
> + - ``teid {unsigned}``: Tunnel endpoint identifier.
You could also merge all three items here, e.g.:
- ``gtp``, ``gtpc``, ``gtpu``: ...
> +
> Actions list
> ^^^^^^^^^^^^
>
> diff --git a/lib/librte_ether/rte_flow.h b/lib/librte_ether/rte_flow.h
> index bba6169..8b24cac 100644
> --- a/lib/librte_ether/rte_flow.h
> +++ b/lib/librte_ether/rte_flow.h
> @@ -309,6 +309,24 @@ enum rte_flow_item_type {
> * See struct rte_flow_item_fuzzy.
> */
> RTE_FLOW_ITEM_TYPE_FUZZY,
> +
> + /**
> + * Matches a GTP header.
Write "GTP-U" to make clear this is not nonspecific "GTP" matching.
> + *
> + * Configure flow for GTP-C packets.
> + *
> + * See struct rte_flow_item_gtp.
> + */
> + RTE_FLOW_ITEM_TYPE_GTPC,
> +
> + /**
> + * Matches a GTP header.
"GTP-C" here.
> + *
> + * Configure flow for GTP-U packets.
> + *
> + * See struct rte_flow_item_gtp.
> + */
> + RTE_FLOW_ITEM_TYPE_GTPU,
> };
>
> /**
> @@ -735,6 +753,32 @@ static const struct rte_flow_item_fuzzy rte_flow_item_fuzzy_mask = {
> #endif
>
> /**
> + * RTE_FLOW_ITEM_TYPE_GTP.
You need to mention the others, something like:
RTE_FLOW_ITEM_TYPE_GTP, RTE_FLOW_ITEM_TYPE_GTPC and RTE_FLOW_ITEM_TYPE_GTPU.
> + *
> + * Matches a GTP header.
Similarly:
Matches a nonspecific GTP, a GTP-C or a GTP-U header.
> + */
> +struct rte_flow_item_gtp {
> + /**
> + * Version (2b), protocol type (1b), reserved (1b),
> + * Extension header flag (1b),
> + * Sequence number flag (1b),
Extension => extension
sequence => sequence
> + * N-PDU number flag (1b).
> + */
> + uint8_t v_pt_rsv_flags;
> + uint8_t msg_type; /**< Message type. */
> + rte_be16_t msg_len; /**< Message length. */
> + rte_be32_t teid; /**< Tunnel endpoint identifier. */
> +};
> +
> +/** Default mask for RTE_FLOW_ITEM_TYPE_GTP. */
> +#ifndef __cplusplus
> +static const struct rte_flow_item_gtp rte_flow_item_gtp_mask = {
> + .msg_type = 0x00,
The above field is not necessary since you're not initializing the entire
structure, the rest is set to 0 by default.
> + .teid = RTE_BE32(0xffffffff),
> +};
> +#endif
> +
> +/**
> * Matching pattern item definition.
> *
> * A pattern is formed by stacking items starting from the lowest protocol
> --
> 2.5.5
>
--
Adrien Mazarguil
6WIND
next prev parent reply other threads:[~2017-09-07 12:20 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-25 7:50 [dpdk-dev] [PATCH 0/7] GTP enabling Beilei Xing
2017-08-25 7:50 ` [dpdk-dev] [PATCH 1/7] net/i40e: support RSS for GTP-C and GTP-U Beilei Xing
2017-09-07 11:20 ` [dpdk-dev] [PATCH v2 0/6] GPT-C and GTP-U enabling Beilei Xing
2017-09-07 11:20 ` [dpdk-dev] [PATCH v2 1/6] net/i40e: support RSS for GTP-C and GTP-U Beilei Xing
2017-09-18 14:17 ` Bruce Richardson
2017-09-18 14:21 ` Bruce Richardson
2017-09-07 11:20 ` [dpdk-dev] [PATCH v2 2/6] ethdev: add GTPC and GTPU items Beilei Xing
2017-09-07 12:19 ` Adrien Mazarguil [this message]
2017-09-12 6:40 ` Xing, Beilei
2017-09-12 10:46 ` Adrien Mazarguil
2017-09-13 3:09 ` Xing, Beilei
2017-09-07 11:21 ` [dpdk-dev] [PATCH v2 3/6] net/i40e: finish integration FDIR with generic flow API Beilei Xing
2017-09-07 11:21 ` [dpdk-dev] [PATCH v2 4/6] net/i40e: add FDIR support for GTP-C and GTP-U Beilei Xing
2017-09-07 11:21 ` [dpdk-dev] [PATCH v2 5/6] net/i40e: add cloud filter parsing function for GTP Beilei Xing
2017-09-07 11:21 ` [dpdk-dev] [PATCH v2 6/6] net/i40e: enable cloud filter for GTP-C and GTP-U Beilei Xing
2017-09-22 22:35 ` [dpdk-dev] [PATCH v3 0/8] GPT-C and GTP-U enabling Beilei Xing
2017-09-22 22:35 ` [dpdk-dev] [PATCH v3 1/8] mbuf: support GTP in software packet type parser Beilei Xing
2017-09-25 9:21 ` Olivier MATZ
2017-09-28 2:17 ` [dpdk-dev] [PATCH v4 0/8] GPT-C and GTP-U enabling Beilei Xing
2017-09-28 2:17 ` [dpdk-dev] [PATCH v4 1/8] mbuf: support GTP in software packet type parser Beilei Xing
2017-09-28 2:17 ` [dpdk-dev] [PATCH v4 2/8] net/i40e: update ptype and pctype info Beilei Xing
2017-09-28 2:17 ` [dpdk-dev] [PATCH v4 3/8] net/i40e: support RSS for new pctype Beilei Xing
2017-09-28 2:17 ` [dpdk-dev] [PATCH v4 4/8] ethdev: add GTP items to support flow API Beilei Xing
2017-09-28 2:17 ` [dpdk-dev] [PATCH v4 5/8] net/i40e: finish integration FDIR with generic " Beilei Xing
2017-09-28 2:17 ` [dpdk-dev] [PATCH v4 6/8] net/i40e: add FDIR support for GTP-C and GTP-U Beilei Xing
2017-09-28 2:17 ` [dpdk-dev] [PATCH v4 7/8] net/i40e: add cloud filter parsing function for GTP Beilei Xing
2017-09-28 2:17 ` [dpdk-dev] [PATCH v4 8/8] net/i40e: enable cloud filter for GTP-C and GTP-U Beilei Xing
2017-09-28 8:13 ` [dpdk-dev] [PATCH v5 0/8] GPT-C and GTP-U enabling Beilei Xing
2017-09-28 8:13 ` [dpdk-dev] [PATCH v5 1/8] mbuf: support GTP in software packet type parser Beilei Xing
2017-09-28 8:13 ` [dpdk-dev] [PATCH v5 2/8] net/i40e: update ptype and pctype info Beilei Xing
2017-09-28 8:13 ` [dpdk-dev] [PATCH v5 3/8] net/i40e: support RSS for new pctype Beilei Xing
2017-09-28 8:13 ` [dpdk-dev] [PATCH v5 4/8] ethdev: add GTP items to support flow API Beilei Xing
2017-09-28 13:43 ` Sean Harte
2017-09-29 2:12 ` Xing, Beilei
2017-09-28 8:13 ` [dpdk-dev] [PATCH v5 5/8] net/i40e: finish integration FDIR with generic " Beilei Xing
2017-09-28 8:13 ` [dpdk-dev] [PATCH v5 6/8] net/i40e: add FDIR support for GTP-C and GTP-U Beilei Xing
2017-09-28 8:13 ` [dpdk-dev] [PATCH v5 7/8] net/i40e: add cloud filter parsing function for GTP Beilei Xing
2017-09-28 8:13 ` [dpdk-dev] [PATCH v5 8/8] net/i40e: enable cloud filter for GTP-C and GTP-U Beilei Xing
2017-09-29 5:18 ` [dpdk-dev] [PATCH v6 0/8] GPT-C and GTP-U enabling Beilei Xing
2017-09-29 5:18 ` [dpdk-dev] [PATCH v6 1/8] mbuf: support GTP in software packet type parser Beilei Xing
2017-09-29 8:15 ` Sean Harte
2017-09-29 8:41 ` Xing, Beilei
2017-09-29 5:18 ` [dpdk-dev] [PATCH v6 2/8] net/i40e: update ptype and pctype info Beilei Xing
2017-09-29 13:22 ` Wu, Jingjing
2017-09-29 13:24 ` Xing, Beilei
2017-09-29 5:18 ` [dpdk-dev] [PATCH v6 3/8] net/i40e: support RSS for new pctype Beilei Xing
2017-09-29 13:24 ` Wu, Jingjing
2017-09-29 5:18 ` [dpdk-dev] [PATCH v6 4/8] ethdev: add GTP items to support flow API Beilei Xing
2017-09-29 8:15 ` Sean Harte
2017-09-29 8:54 ` Xing, Beilei
2017-09-29 9:29 ` Sean Harte
2017-09-29 9:37 ` Xing, Beilei
2017-10-02 12:27 ` Adrien Mazarguil
2017-10-03 8:56 ` Sean Harte
2017-10-05 8:06 ` Wu, Jingjing
2017-10-05 8:30 ` Adrien Mazarguil
2017-10-05 8:39 ` Wu, Jingjing
2017-09-29 5:18 ` [dpdk-dev] [PATCH v6 5/8] net/i40e: finish integration FDIR with generic " Beilei Xing
2017-09-29 13:28 ` Wu, Jingjing
2017-09-29 5:19 ` [dpdk-dev] [PATCH v6 6/8] net/i40e: add FDIR support for GTP-C and GTP-U Beilei Xing
2017-09-29 8:15 ` Sean Harte
2017-09-29 9:33 ` Xing, Beilei
2017-09-29 10:09 ` Sean Harte
2017-09-29 11:30 ` Xing, Beilei
2017-09-29 11:39 ` Xing, Beilei
2017-09-29 13:14 ` Xing, Beilei
2017-09-29 15:15 ` Xing, Beilei
2017-09-29 5:19 ` [dpdk-dev] [PATCH v6 7/8] net/i40e: add cloud filter parsing function for GTP Beilei Xing
2017-09-29 5:19 ` [dpdk-dev] [PATCH v6 8/8] net/i40e: enable cloud filter for GTP-C and GTP-U Beilei Xing
2017-09-29 15:50 ` [dpdk-dev] [PATCH v7 0/8] net/i40e: GPT-C and GTP-U enabling Beilei Xing
2017-09-29 15:50 ` [dpdk-dev] [PATCH v7 1/8] mbuf: support GTP in software packet type parser Beilei Xing
2017-09-29 15:50 ` [dpdk-dev] [PATCH v7 2/8] net/i40e: update ptype and pctype info Beilei Xing
2017-10-05 2:51 ` Wu, Jingjing
2017-09-29 15:50 ` [dpdk-dev] [PATCH v7 3/8] net/i40e: support RSS for new pctype Beilei Xing
2017-09-29 15:50 ` [dpdk-dev] [PATCH v7 4/8] ethdev: add GTP items to support flow API Beilei Xing
2017-10-05 8:01 ` Wu, Jingjing
2017-09-29 15:50 ` [dpdk-dev] [PATCH v7 5/8] net/i40e: finish integration FDIR with generic " Beilei Xing
2017-10-05 2:52 ` Wu, Jingjing
2017-09-29 15:50 ` [dpdk-dev] [PATCH v7 6/8] net/i40e: add FDIR support for GTP-C and GTP-U Beilei Xing
2017-10-05 3:09 ` Wu, Jingjing
2017-09-29 15:50 ` [dpdk-dev] [PATCH v7 7/8] net/i40e: add cloud filter parsing function for GTP Beilei Xing
2017-10-05 3:13 ` Wu, Jingjing
2017-09-29 15:50 ` [dpdk-dev] [PATCH v7 8/8] net/i40e: enable cloud filter for GTP-C and GTP-U Beilei Xing
2017-10-05 8:03 ` Wu, Jingjing
2017-10-04 22:43 ` [dpdk-dev] [PATCH v7 0/8] net/i40e: GPT-C and GTP-U enabling Ferruh Yigit
2017-10-05 8:14 ` [dpdk-dev] [PATCH v8 0/7] " Beilei Xing
2017-10-05 8:14 ` [dpdk-dev] [PATCH v8 1/7] mbuf: support GTP in software packet type parser Beilei Xing
2017-10-05 11:50 ` Sean Harte
2017-10-05 8:14 ` [dpdk-dev] [PATCH v8 2/7] net/i40e: update ptype and pctype info Beilei Xing
2017-10-05 8:14 ` [dpdk-dev] [PATCH v8 3/7] ethdev: add GTP items to support flow API Beilei Xing
2017-10-05 11:50 ` Sean Harte
2017-10-05 8:14 ` [dpdk-dev] [PATCH v8 4/7] net/i40e: finish integration FDIR with generic " Beilei Xing
2017-10-05 8:14 ` [dpdk-dev] [PATCH v8 5/7] net/i40e: add FDIR support for GTP-C and GTP-U Beilei Xing
2017-10-05 11:50 ` Sean Harte
2017-10-05 8:14 ` [dpdk-dev] [PATCH v8 6/7] net/i40e: add cloud filter parsing function for GTP Beilei Xing
2017-10-05 8:14 ` [dpdk-dev] [PATCH v8 7/7] net/i40e: enable cloud filter for GTP-C and GTP-U Beilei Xing
2017-10-05 8:23 ` [dpdk-dev] [PATCH v8 0/7] net/i40e: GPT-C and GTP-U enabling Wu, Jingjing
2017-10-05 21:13 ` Ferruh Yigit
2017-09-22 22:35 ` [dpdk-dev] [PATCH v3 2/8] net/i40e: update ptype and pctype info Beilei Xing
2017-09-23 2:58 ` Wu, Jingjing
2017-09-22 22:35 ` [dpdk-dev] [PATCH v3 3/8] net/i40e: support RSS for new pctype Beilei Xing
2017-09-22 22:35 ` [dpdk-dev] [PATCH v3 4/8] ethdev: add GTP items to support flow API Beilei Xing
2017-09-22 13:39 ` Adrien Mazarguil
2017-09-22 22:35 ` [dpdk-dev] [PATCH v3 5/8] net/i40e: finish integration FDIR with generic " Beilei Xing
2017-09-22 22:35 ` [dpdk-dev] [PATCH v3 6/8] net/i40e: add FDIR support for GTP-C and GTP-U Beilei Xing
2017-09-22 22:35 ` [dpdk-dev] [PATCH v3 7/8] net/i40e: add cloud filter parsing function for GTP Beilei Xing
2017-09-22 22:35 ` [dpdk-dev] [PATCH v3 8/8] net/i40e: enable cloud filter for GTP-C and GTP-U Beilei Xing
2017-08-25 7:50 ` [dpdk-dev] [PATCH 2/7] ethdev: add GTP item Beilei Xing
2017-09-06 16:02 ` Adrien Mazarguil
2017-09-07 6:31 ` Xing, Beilei
2017-08-25 7:50 ` [dpdk-dev] [PATCH 3/7] app/testpmd: add GTP fields to flow command Beilei Xing
2017-09-06 16:03 ` Adrien Mazarguil
2017-08-25 7:50 ` [dpdk-dev] [PATCH 4/7] net/i40e: finish integration FDIR with generic flow API Beilei Xing
2017-08-25 7:50 ` [dpdk-dev] [PATCH 5/7] net/i40e: add FDIR support for GTP-C and GTP-U Beilei Xing
2017-08-25 7:50 ` [dpdk-dev] [PATCH 6/7] net/i40e: add cloud filter parsing function for GTP Beilei Xing
2017-08-25 7:50 ` [dpdk-dev] [PATCH 7/7] net/i40e: enable cloud filter for GTP-C and GTP-U Beilei Xing
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170907121949.GI4301@6wind.com \
--to=adrien.mazarguil@6wind.com \
--cc=andrey.chilikin@intel.com \
--cc=beilei.xing@intel.com \
--cc=dev@dpdk.org \
--cc=jingjing.wu@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).