DPDK patches and discussions
 help / color / mirror / Atom feed
From: Wenzhuo Lu <wenzhuo.lu@intel.com>
To: dev@dpdk.org
Cc: Wenzhuo Lu <wenzhuo.lu@intel.com>
Subject: [dpdk-dev] [PATCH v3 4/8] net/ice: support Rx scatter SSE vector
Date: Fri, 15 Mar 2019 14:22:51 +0800	[thread overview]
Message-ID: <1552630975-62900-5-git-send-email-wenzhuo.lu@intel.com> (raw)
Message-ID: <20190315062251.4SscG3aIXcsxceR7DFem3QsR7Mmejy0_6y6sg2sA_oU@z> (raw)
In-Reply-To: <1552630975-62900-1-git-send-email-wenzhuo.lu@intel.com>

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
---
 drivers/net/ice/ice_rxtx.c         | 16 +++++++++++----
 drivers/net/ice/ice_rxtx.h         |  2 ++
 drivers/net/ice/ice_rxtx_vec_sse.c | 41 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c
index 8694872..6529ae5 100644
--- a/drivers/net/ice/ice_rxtx.c
+++ b/drivers/net/ice/ice_rxtx.c
@@ -1494,7 +1494,8 @@
 
 #ifdef RTE_LIBRTE_ICE_INC_VECTOR
 #ifdef RTE_ARCH_X86
-	if (dev->rx_pkt_burst == ice_recv_pkts_vec)
+	if (dev->rx_pkt_burst == ice_recv_pkts_vec ||
+	    dev->rx_pkt_burst == ice_recv_scattered_pkts_vec)
 		return ptypes;
 #endif
 #endif
@@ -2244,9 +2245,16 @@ void __attribute__((cold))
 			rxq = dev->data->rx_queues[i];
 			(void)ice_rxq_vec_setup(rxq);
 		}
-		PMD_DRV_LOG(DEBUG, "Using Vector Rx (port %d).",
-			    dev->data->port_id);
-		dev->rx_pkt_burst = ice_recv_pkts_vec;
+		if (dev->data->scattered_rx) {
+			PMD_DRV_LOG(DEBUG,
+				    "Using Vector Scattered Rx (port %d).",
+				    dev->data->port_id);
+			dev->rx_pkt_burst = ice_recv_scattered_pkts_vec;
+		} else {
+			PMD_DRV_LOG(DEBUG, "Using Vector Rx (port %d).",
+				    dev->data->port_id);
+			dev->rx_pkt_burst = ice_recv_pkts_vec;
+		}
 
 		return;
 	}
diff --git a/drivers/net/ice/ice_rxtx.h b/drivers/net/ice/ice_rxtx.h
index 2659176..aab4a3a 100644
--- a/drivers/net/ice/ice_rxtx.h
+++ b/drivers/net/ice/ice_rxtx.h
@@ -176,5 +176,7 @@ void ice_txq_info_get(struct rte_eth_dev *dev, uint16_t queue_id,
 int ice_rxq_vec_setup(struct ice_rx_queue *rxq);
 uint16_t ice_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 			   uint16_t nb_pkts);
+uint16_t ice_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+				     uint16_t nb_pkts);
 #endif
 #endif /* _ICE_RXTX_H_ */
diff --git a/drivers/net/ice/ice_rxtx_vec_sse.c b/drivers/net/ice/ice_rxtx_vec_sse.c
index d444be9..789cf07 100644
--- a/drivers/net/ice/ice_rxtx_vec_sse.c
+++ b/drivers/net/ice/ice_rxtx_vec_sse.c
@@ -464,6 +464,47 @@
 	return _recv_raw_pkts_vec(rx_queue, rx_pkts, nb_pkts, NULL);
 }
 
+/* vPMD receive routine that reassembles scattered packets
+ * Notice:
+ * - nb_pkts < ICE_DESCS_PER_LOOP, just return no packet
+ * - nb_pkts > ICE_VPMD_RX_BURST, only scan ICE_VPMD_RX_BURST
+ *   numbers of DD bits
+ */
+uint16_t
+ice_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+			    uint16_t nb_pkts)
+{
+	struct ice_rx_queue *rxq = rx_queue;
+	uint8_t split_flags[ICE_VPMD_RX_BURST] = {0};
+
+	/* get some new buffers */
+	uint16_t nb_bufs = _recv_raw_pkts_vec(rxq, rx_pkts, nb_pkts,
+					      split_flags);
+	if (nb_bufs == 0)
+		return 0;
+
+	/* happy day case, full burst + no packets to be joined */
+	const uint64_t *split_fl64 = (uint64_t *)split_flags;
+
+	if (!rxq->pkt_first_seg &&
+	    split_fl64[0] == 0 && split_fl64[1] == 0 &&
+	    split_fl64[2] == 0 && split_fl64[3] == 0)
+		return nb_bufs;
+
+	/* reassemble any packets that need reassembly*/
+	unsigned i = 0;
+
+	if (!rxq->pkt_first_seg) {
+		/* find the first split flag, and only reassemble then*/
+		while (i < nb_bufs && !split_flags[i])
+			i++;
+		if (i == nb_bufs)
+			return nb_bufs;
+	}
+	return i + reassemble_packets(rxq, &rx_pkts[i], nb_bufs - i,
+				      &split_flags[i]);
+}
+
 static void __attribute__((cold))
 ice_rx_queue_release_mbufs_vec(struct ice_rx_queue *rxq)
 {
-- 
1.9.3


  parent reply	other threads:[~2019-03-15  6:18 UTC|newest]

Thread overview: 219+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-28  7:48 [dpdk-dev] [PATCH 0/8] Support vector instructions on ICE Wenzhuo Lu
2019-02-28  7:48 ` [dpdk-dev] [PATCH 1/8] net/ice: fix TX function setting Wenzhuo Lu
2019-02-28  7:48 ` [dpdk-dev] [PATCH 2/8] net/ice: add pointer for queue buffer release Wenzhuo Lu
2019-02-28  7:48 ` [dpdk-dev] [PATCH 3/8] net/ice: support RX SSE vector Wenzhuo Lu
2019-03-01  3:44   ` Zhang, Qi Z
2019-03-04  1:27     ` Lu, Wenzhuo
2019-02-28  7:48 ` [dpdk-dev] [PATCH 4/8] net/ice: support RX scatter " Wenzhuo Lu
2019-02-28  7:48 ` [dpdk-dev] [PATCH 5/8] net/ice: support TX " Wenzhuo Lu
2019-02-28  7:48 ` [dpdk-dev] [PATCH 6/8] net/ice: support RX AVX2 vector Wenzhuo Lu
2019-02-28  7:48 ` [dpdk-dev] [PATCH 7/8] net/ice: support RX scatter " Wenzhuo Lu
2019-02-28  7:48 ` [dpdk-dev] [PATCH 8/8] net/ice: support TX " Wenzhuo Lu
2019-03-01  3:41 ` [dpdk-dev] [PATCH 0/8] Support vector instructions on ICE Zhang, Qi Z
2019-03-04  1:24   ` Lu, Wenzhuo
2019-03-04  6:53 ` [dpdk-dev] [PATCH v2 " Wenzhuo Lu
2019-03-04  6:53   ` [dpdk-dev] [PATCH v2 1/8] net/ice: fix Tx function setting Wenzhuo Lu
2019-03-04  6:53   ` [dpdk-dev] [PATCH v2 2/8] net/ice: add pointer for queue buffer release Wenzhuo Lu
2019-03-04  6:53   ` [dpdk-dev] [PATCH v2 3/8] net/ice: support vector SSE in RX Wenzhuo Lu
2019-03-11  3:26     ` Zhang, Qi Z
2019-03-15  1:50       ` Lu, Wenzhuo
2019-03-15  1:50         ` Lu, Wenzhuo
2019-03-04  6:53   ` [dpdk-dev] [PATCH v2 4/8] net/ice: support Rx scatter SSE vector Wenzhuo Lu
2019-03-04  6:53   ` [dpdk-dev] [PATCH v2 5/8] net/ice: support Tx " Wenzhuo Lu
2019-03-04  6:53   ` [dpdk-dev] [PATCH v2 6/8] net/ice: support Rx AVX2 vector Wenzhuo Lu
2019-03-04  6:53   ` [dpdk-dev] [PATCH v2 7/8] net/ice: support Rx scatter " Wenzhuo Lu
2019-03-04  6:53   ` [dpdk-dev] [PATCH v2 8/8] net/ice: support vector AVX2 in TX Wenzhuo Lu
2019-03-15  6:22 ` [dpdk-dev] [PATCH v3 0/8] Support vector instructions on ICE Wenzhuo Lu
2019-03-15  6:22   ` Wenzhuo Lu
2019-03-15  6:22   ` [dpdk-dev] [PATCH v3 1/8] net/ice: fix Tx function setting Wenzhuo Lu
2019-03-15  6:22     ` Wenzhuo Lu
2019-03-15 17:52     ` Ferruh Yigit
2019-03-15 17:52       ` Ferruh Yigit
2019-03-18  1:08       ` Lu, Wenzhuo
2019-03-18  1:08         ` Lu, Wenzhuo
2019-03-20 17:22         ` Ferruh Yigit
2019-03-20 17:22           ` Ferruh Yigit
2019-03-21  2:29           ` Lu, Wenzhuo
2019-03-21  2:29             ` Lu, Wenzhuo
2019-03-15  6:22   ` [dpdk-dev] [PATCH v3 2/8] net/ice: add pointer for queue buffer release Wenzhuo Lu
2019-03-15  6:22     ` Wenzhuo Lu
2019-03-15 17:52     ` Ferruh Yigit
2019-03-15 17:52       ` Ferruh Yigit
2019-03-18  1:15       ` Lu, Wenzhuo
2019-03-18  1:15         ` Lu, Wenzhuo
2019-03-15  6:22   ` [dpdk-dev] [PATCH v3 3/8] net/ice: support vector SSE in RX Wenzhuo Lu
2019-03-15  6:22     ` Wenzhuo Lu
2019-03-15 17:53     ` Ferruh Yigit
2019-03-15 17:53       ` Ferruh Yigit
2019-03-18  1:22       ` Lu, Wenzhuo
2019-03-18  1:22         ` Lu, Wenzhuo
2019-03-20 17:35         ` Ferruh Yigit
2019-03-20 17:35           ` Ferruh Yigit
2019-03-21  2:48           ` Lu, Wenzhuo
2019-03-21  2:48             ` Lu, Wenzhuo
2019-03-15  6:22   ` Wenzhuo Lu [this message]
2019-03-15  6:22     ` [dpdk-dev] [PATCH v3 4/8] net/ice: support Rx scatter SSE vector Wenzhuo Lu
2019-03-15  6:22   ` [dpdk-dev] [PATCH v3 5/8] net/ice: support Tx " Wenzhuo Lu
2019-03-15  6:22     ` Wenzhuo Lu
2019-03-15  6:22   ` [dpdk-dev] [PATCH v3 6/8] net/ice: support Rx AVX2 vector Wenzhuo Lu
2019-03-15  6:22     ` Wenzhuo Lu
2019-03-15 17:54     ` Ferruh Yigit
2019-03-15 17:54       ` Ferruh Yigit
2019-03-18  1:37       ` Lu, Wenzhuo
2019-03-18  1:37         ` Lu, Wenzhuo
2019-03-20 17:37         ` Ferruh Yigit
2019-03-20 17:37           ` Ferruh Yigit
2019-03-21  2:31           ` Lu, Wenzhuo
2019-03-21  2:31             ` Lu, Wenzhuo
2019-03-15  6:22   ` [dpdk-dev] [PATCH v3 7/8] net/ice: support Rx scatter " Wenzhuo Lu
2019-03-15  6:22     ` Wenzhuo Lu
2019-03-15  6:22   ` [dpdk-dev] [PATCH v3 8/8] net/ice: support vector AVX2 in TX Wenzhuo Lu
2019-03-15  6:22     ` Wenzhuo Lu
2019-03-15 17:54     ` Ferruh Yigit
2019-03-15 17:54       ` Ferruh Yigit
2019-03-18  1:38       ` Lu, Wenzhuo
2019-03-18  1:38         ` Lu, Wenzhuo
2019-03-15  8:08   ` [dpdk-dev] [PATCH v3 0/8] Support vector instructions on ICE Zhang, Qi Z
2019-03-15  8:08     ` Zhang, Qi Z
2019-03-21  6:26 ` [dpdk-dev] [PATCH v4 " Wenzhuo Lu
2019-03-21  6:26   ` Wenzhuo Lu
2019-03-21  6:26   ` [dpdk-dev] [PATCH v4 1/8] net/ice: fix Tx function setting Wenzhuo Lu
2019-03-21  6:26     ` Wenzhuo Lu
2019-03-22  8:46     ` Maxime Coquelin
2019-03-22  8:46       ` Maxime Coquelin
2019-03-22  9:01       ` Maxime Coquelin
2019-03-22  9:01         ` Maxime Coquelin
2019-03-21  6:26   ` [dpdk-dev] [PATCH v4 2/8] net/ice: add pointer for queue buffer release Wenzhuo Lu
2019-03-21  6:26     ` Wenzhuo Lu
2019-03-22  8:59     ` Maxime Coquelin
2019-03-22  8:59       ` Maxime Coquelin
2019-03-21  6:26   ` [dpdk-dev] [PATCH v4 3/8] net/ice: support vector SSE in RX Wenzhuo Lu
2019-03-21  6:26     ` Wenzhuo Lu
2019-03-21 19:02     ` Ferruh Yigit
2019-03-21 19:02       ` Ferruh Yigit
2019-03-22  1:46       ` Lu, Wenzhuo
2019-03-22  1:46         ` Lu, Wenzhuo
2019-03-21  6:26   ` [dpdk-dev] [PATCH v4 4/8] net/ice: support Rx scatter SSE vector Wenzhuo Lu
2019-03-21  6:26     ` Wenzhuo Lu
2019-03-21  6:26   ` [dpdk-dev] [PATCH v4 5/8] net/ice: support Tx " Wenzhuo Lu
2019-03-21  6:26     ` Wenzhuo Lu
2019-03-21  6:26   ` [dpdk-dev] [PATCH v4 6/8] net/ice: support Rx AVX2 vector Wenzhuo Lu
2019-03-21  6:26     ` Wenzhuo Lu
2019-03-21  6:26   ` [dpdk-dev] [PATCH v4 7/8] net/ice: support Rx scatter " Wenzhuo Lu
2019-03-21  6:26     ` Wenzhuo Lu
2019-03-21  6:26   ` [dpdk-dev] [PATCH v4 8/8] net/ice: support vector AVX2 in TX Wenzhuo Lu
2019-03-21  6:26     ` Wenzhuo Lu
2019-03-21 19:20     ` Ferruh Yigit
2019-03-21 19:20       ` Ferruh Yigit
2019-03-22  1:45       ` Lu, Wenzhuo
2019-03-22  1:45         ` Lu, Wenzhuo
2019-03-22  2:58 ` [dpdk-dev] [PATCH v5 0/8] Support vector instructions on ICE Wenzhuo Lu
2019-03-22  2:58   ` Wenzhuo Lu
2019-03-22  2:58   ` [dpdk-dev] [PATCH v5 1/8] net/ice: fix Tx function setting Wenzhuo Lu
2019-03-22  2:58     ` Wenzhuo Lu
2019-03-22  2:58   ` [dpdk-dev] [PATCH v5 2/8] net/ice: add pointer for queue buffer release Wenzhuo Lu
2019-03-22  2:58     ` Wenzhuo Lu
2019-03-22  2:58   ` [dpdk-dev] [PATCH v5 3/8] net/ice: support vector SSE in RX Wenzhuo Lu
2019-03-22  2:58     ` Wenzhuo Lu
2019-03-22  9:42     ` Maxime Coquelin
2019-03-22  9:42       ` Maxime Coquelin
2019-03-25  1:56       ` Lu, Wenzhuo
2019-03-25  1:56         ` Lu, Wenzhuo
2019-03-22  2:58   ` [dpdk-dev] [PATCH v5 4/8] net/ice: support Rx scatter SSE vector Wenzhuo Lu
2019-03-22  2:58     ` Wenzhuo Lu
2019-03-22  2:58   ` [dpdk-dev] [PATCH v5 5/8] net/ice: support Tx " Wenzhuo Lu
2019-03-22  2:58     ` Wenzhuo Lu
2019-03-22  9:58     ` Maxime Coquelin
2019-03-22  9:58       ` Maxime Coquelin
2019-03-25  2:02       ` Lu, Wenzhuo
2019-03-25  2:02         ` Lu, Wenzhuo
2019-03-22  2:58   ` [dpdk-dev] [PATCH v5 6/8] net/ice: support Rx AVX2 vector Wenzhuo Lu
2019-03-22  2:58     ` Wenzhuo Lu
2019-03-22 10:12     ` Maxime Coquelin
2019-03-22 10:12       ` Maxime Coquelin
2019-03-25  2:22       ` Lu, Wenzhuo
2019-03-25  2:22         ` Lu, Wenzhuo
2019-03-25  8:26         ` Maxime Coquelin
2019-03-25  8:26           ` Maxime Coquelin
2019-03-26  1:00           ` Lu, Wenzhuo
2019-03-26  1:00             ` Lu, Wenzhuo
2019-03-26  9:28             ` Maxime Coquelin
2019-03-26  9:28               ` Maxime Coquelin
2019-03-27  0:56               ` Lu, Wenzhuo
2019-03-27  0:56                 ` Lu, Wenzhuo
2019-03-27  7:50                 ` Maxime Coquelin
2019-03-27  7:50                   ` Maxime Coquelin
2019-03-28  1:56                   ` Lu, Wenzhuo
2019-03-28  1:56                     ` Lu, Wenzhuo
2019-03-22  2:58   ` [dpdk-dev] [PATCH v5 7/8] net/ice: support Rx scatter " Wenzhuo Lu
2019-03-22  2:58     ` Wenzhuo Lu
2019-03-22  2:58   ` [dpdk-dev] [PATCH v5 8/8] net/ice: support vector AVX2 in TX Wenzhuo Lu
2019-03-22  2:58     ` Wenzhuo Lu
2019-03-25  6:06 ` [dpdk-dev] [PATCH v6 0/8] Support vector instructions on ICE Wenzhuo Lu
2019-03-25  6:06   ` Wenzhuo Lu
2019-03-25  6:06   ` [dpdk-dev] [PATCH v6 1/8] net/ice: fix Tx function setting Wenzhuo Lu
2019-03-25  6:06     ` Wenzhuo Lu
2019-03-25  6:06   ` [dpdk-dev] [PATCH v6 2/8] net/ice: add pointer for queue buffer release Wenzhuo Lu
2019-03-25  6:06     ` Wenzhuo Lu
2019-03-25 13:23     ` Maxime Coquelin
2019-03-25 13:23       ` Maxime Coquelin
2019-03-26  1:15       ` Lu, Wenzhuo
2019-03-26  1:15         ` Lu, Wenzhuo
2019-03-25  6:06   ` [dpdk-dev] [PATCH v6 3/8] net/ice: support vector SSE in RX Wenzhuo Lu
2019-03-25  6:06     ` Wenzhuo Lu
2019-03-25  6:06   ` [dpdk-dev] [PATCH v6 4/8] net/ice: support Rx scatter SSE vector Wenzhuo Lu
2019-03-25  6:06     ` Wenzhuo Lu
2019-03-25  6:06   ` [dpdk-dev] [PATCH v6 5/8] net/ice: support Tx " Wenzhuo Lu
2019-03-25  6:06     ` Wenzhuo Lu
2019-03-25  6:06   ` [dpdk-dev] [PATCH v6 6/8] net/ice: support Rx AVX2 vector Wenzhuo Lu
2019-03-25  6:06     ` Wenzhuo Lu
2019-03-25  6:06   ` [dpdk-dev] [PATCH v6 7/8] net/ice: support Rx scatter " Wenzhuo Lu
2019-03-25  6:06     ` Wenzhuo Lu
2019-03-25  6:06   ` [dpdk-dev] [PATCH v6 8/8] net/ice: support vector AVX2 in TX Wenzhuo Lu
2019-03-25  6:06     ` Wenzhuo Lu
2019-03-25  7:56   ` [dpdk-dev] [PATCH v6 0/8] Support vector instructions on ICE Zhang, Qi Z
2019-03-25  7:56     ` Zhang, Qi Z
2019-03-26  6:16 ` [dpdk-dev] [PATCH v7 " Wenzhuo Lu
2019-03-26  6:16   ` Wenzhuo Lu
2019-03-26  6:16   ` [dpdk-dev] [PATCH v7 1/8] net/ice: fix Tx function setting Wenzhuo Lu
2019-03-26  6:16     ` Wenzhuo Lu
2019-03-26  6:16   ` [dpdk-dev] [PATCH v7 2/8] net/ice: add pointer for queue buffer release Wenzhuo Lu
2019-03-26  6:16     ` Wenzhuo Lu
2019-03-26  6:16   ` [dpdk-dev] [PATCH v7 3/8] net/ice: support vector SSE in RX Wenzhuo Lu
2019-03-26  6:16     ` Wenzhuo Lu
2019-03-26  6:16   ` [dpdk-dev] [PATCH v7 4/8] net/ice: support Rx scatter SSE vector Wenzhuo Lu
2019-03-26  6:16     ` Wenzhuo Lu
2019-03-26  6:16   ` [dpdk-dev] [PATCH v7 5/8] net/ice: support Tx " Wenzhuo Lu
2019-03-26  6:16     ` Wenzhuo Lu
2019-03-26  6:16   ` [dpdk-dev] [PATCH v7 6/8] net/ice: support Rx AVX2 vector Wenzhuo Lu
2019-03-26  6:16     ` Wenzhuo Lu
2019-03-26  6:16   ` [dpdk-dev] [PATCH v7 7/8] net/ice: support Rx scatter " Wenzhuo Lu
2019-03-26  6:16     ` Wenzhuo Lu
2019-03-26  6:16   ` [dpdk-dev] [PATCH v7 8/8] net/ice: support vector AVX2 in TX Wenzhuo Lu
2019-03-26  6:16     ` Wenzhuo Lu
2019-03-26  9:50   ` [dpdk-dev] [PATCH v7 0/8] Support vector instructions on ICE Ferruh Yigit
2019-03-26  9:50     ` Ferruh Yigit
2019-03-31 15:52     ` Thomas Monjalon
2019-03-31 15:52       ` Thomas Monjalon
2019-04-01  5:46       ` Lu, Wenzhuo
2019-04-01  5:46         ` Lu, Wenzhuo
2019-04-01 12:51       ` Ferruh Yigit
2019-04-01 12:51         ` Ferruh Yigit
2019-04-01 13:27         ` Thomas Monjalon
2019-04-01 13:27           ` Thomas Monjalon
2019-04-01 15:12           ` Ferruh Yigit
2019-04-01 15:12             ` Ferruh Yigit
2019-04-01 15:14             ` Thomas Monjalon
2019-04-01 15:14               ` Thomas Monjalon
2019-04-02  1:01               ` Lu, Wenzhuo
2019-04-02  1:01                 ` Lu, Wenzhuo
2019-04-02  7:12                 ` Thomas Monjalon
2019-04-02  7:12                   ` Thomas Monjalon
2019-04-01 14:39         ` Bruce Richardson
2019-04-01 14:39           ` Bruce Richardson
2019-04-01 14:56           ` Ferruh Yigit
2019-04-01 14:56             ` Ferruh Yigit
2019-04-01 15:09             ` Ferruh Yigit
2019-04-01 15:09               ` Ferruh Yigit
2019-04-01 15:13             ` Thomas Monjalon
2019-04-01 15:13               ` Thomas Monjalon

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=1552630975-62900-5-git-send-email-wenzhuo.lu@intel.com \
    --to=wenzhuo.lu@intel.com \
    --cc=dev@dpdk.org \
    /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).