From: Lingyu Liu <lingyu.liu@intel.com>
To: dev@dpdk.org, qi.z.zhang@intel.com, beilei.xing@intel.com,
jingjing.wu@intel.com
Cc: junfeng.guo@intel.com, Lingyu Liu <lingyu.liu@intel.com>
Subject: [dpdk-dev] [PATCH v5 4/4] net/iavf: support AVF RSS for GTPoGRE packet
Date: Thu, 10 Jun 2021 13:05:19 +0000 [thread overview]
Message-ID: <20210610130520.713482-5-lingyu.liu@intel.com> (raw)
In-Reply-To: <20210610130520.713482-1-lingyu.liu@intel.com>
Support AVF RSS for inner most header of GTPoGRE packet. It supports
RSS based on inner most IP src + dst address and TCP/UDP src + dst
port.
Signed-off-by: Lingyu Liu <lingyu.liu@intel.com>
---
drivers/net/iavf/iavf_hash.c | 154 +++++++++++++++++++++++++++++------
1 file changed, 127 insertions(+), 27 deletions(-)
diff --git a/drivers/net/iavf/iavf_hash.c b/drivers/net/iavf/iavf_hash.c
index 5d3d62839b..9e86d95136 100644
--- a/drivers/net/iavf/iavf_hash.c
+++ b/drivers/net/iavf/iavf_hash.c
@@ -30,6 +30,10 @@
#define IAVF_PHINT_GTPU_EH_UP BIT_ULL(3)
#define IAVF_PHINT_OUTER_IPV4 BIT_ULL(4)
#define IAVF_PHINT_OUTER_IPV6 BIT_ULL(5)
+#define IAVF_PHINT_GRE BIT_ULL(6)
+/* the second IP header of GTPoGRE */
+#define IAVF_PHINT_MID_IPV4 BIT_ULL(7)
+#define IAVF_PHINT_MID_IPV6 BIT_ULL(8)
#define IAVF_PHINT_GTPU_MSK (IAVF_PHINT_GTPU | \
IAVF_PHINT_GTPU_EH | \
@@ -232,6 +236,30 @@ struct virtchnl_proto_hdrs inner_ipv4_tcp_tmplt = {
TUNNEL_LEVEL_INNER, 2, {proto_hdr_ipv4_with_prot, proto_hdr_tcp}
};
+struct virtchnl_proto_hdrs second_inner_ipv4_tmplt = {
+ 2, 1, {proto_hdr_ipv4}
+};
+
+struct virtchnl_proto_hdrs second_inner_ipv4_udp_tmplt = {
+ 2, 2, {proto_hdr_ipv4_with_prot, proto_hdr_udp}
+};
+
+struct virtchnl_proto_hdrs second_inner_ipv4_tcp_tmplt = {
+ 2, 2, {proto_hdr_ipv4_with_prot, proto_hdr_tcp}
+};
+
+struct virtchnl_proto_hdrs second_inner_ipv6_tmplt = {
+ 2, 1, {proto_hdr_ipv6}
+};
+
+struct virtchnl_proto_hdrs second_inner_ipv6_udp_tmplt = {
+ 2, 2, {proto_hdr_ipv6_with_prot, proto_hdr_udp}
+};
+
+struct virtchnl_proto_hdrs second_inner_ipv6_tcp_tmplt = {
+ 2, 2, {proto_hdr_ipv6_with_prot, proto_hdr_tcp}
+};
+
struct virtchnl_proto_hdrs inner_ipv4_sctp_tmplt = {
TUNNEL_LEVEL_INNER, 2, {proto_hdr_ipv4, proto_hdr_sctp}
};
@@ -420,6 +448,30 @@ static struct iavf_pattern_match_item iavf_hash_pattern_list[] = {
{iavf_pattern_eth_ipv6_gtpu_eh_ipv4, IAVF_RSS_TYPE_GTPU_IPV4, &inner_ipv4_tmplt},
{iavf_pattern_eth_ipv6_gtpu_eh_ipv4_udp, IAVF_RSS_TYPE_GTPU_IPV4_UDP, &inner_ipv4_udp_tmplt},
{iavf_pattern_eth_ipv6_gtpu_eh_ipv4_tcp, IAVF_RSS_TYPE_GTPU_IPV4_TCP, &inner_ipv4_tcp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_ipv4, IAVF_RSS_TYPE_GTPU_IPV4, &second_inner_ipv4_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_ipv4_udp, IAVF_RSS_TYPE_GTPU_IPV4_UDP, &second_inner_ipv4_udp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_ipv4_tcp, IAVF_RSS_TYPE_GTPU_IPV4_TCP, &second_inner_ipv4_tcp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_ipv4, IAVF_RSS_TYPE_GTPU_IPV4, &second_inner_ipv4_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_ipv4_udp, IAVF_RSS_TYPE_GTPU_IPV4_UDP, &second_inner_ipv4_udp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_ipv4_tcp, IAVF_RSS_TYPE_GTPU_IPV4_TCP, &second_inner_ipv4_tcp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_ipv4, IAVF_RSS_TYPE_GTPU_IPV4, &second_inner_ipv4_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_ipv4_udp, IAVF_RSS_TYPE_GTPU_IPV4_UDP, &second_inner_ipv4_udp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_ipv4_tcp, IAVF_RSS_TYPE_GTPU_IPV4_TCP, &second_inner_ipv4_tcp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_ipv4, IAVF_RSS_TYPE_GTPU_IPV4, &second_inner_ipv4_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_ipv4_udp, IAVF_RSS_TYPE_GTPU_IPV4_UDP, &second_inner_ipv4_udp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_ipv4_tcp, IAVF_RSS_TYPE_GTPU_IPV4_TCP, &second_inner_ipv4_tcp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_eh_ipv4, IAVF_RSS_TYPE_GTPU_IPV4, &second_inner_ipv4_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_eh_ipv4_udp, IAVF_RSS_TYPE_GTPU_IPV4_UDP, &second_inner_ipv4_udp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_eh_ipv4_tcp, IAVF_RSS_TYPE_GTPU_IPV4_TCP, &second_inner_ipv4_tcp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_eh_ipv4, IAVF_RSS_TYPE_GTPU_IPV4, &second_inner_ipv4_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_eh_ipv4_udp, IAVF_RSS_TYPE_GTPU_IPV4_UDP, &second_inner_ipv4_udp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_eh_ipv4_tcp, IAVF_RSS_TYPE_GTPU_IPV4_TCP, &second_inner_ipv4_tcp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_eh_ipv4, IAVF_RSS_TYPE_GTPU_IPV4, &second_inner_ipv4_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_eh_ipv4_udp, IAVF_RSS_TYPE_GTPU_IPV4_UDP, &second_inner_ipv4_udp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_eh_ipv4_tcp, IAVF_RSS_TYPE_GTPU_IPV4_TCP, &second_inner_ipv4_tcp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_eh_ipv4, IAVF_RSS_TYPE_GTPU_IPV4, &second_inner_ipv4_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_eh_ipv4_udp, IAVF_RSS_TYPE_GTPU_IPV4_UDP, &second_inner_ipv4_udp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_eh_ipv4_tcp, IAVF_RSS_TYPE_GTPU_IPV4_TCP, &second_inner_ipv4_tcp_tmplt},
{iavf_pattern_eth_ipv4_esp, IAVF_RSS_TYPE_IPV4_ESP, &ipv4_esp_tmplt},
{iavf_pattern_eth_ipv4_udp_esp, IAVF_RSS_TYPE_IPV4_ESP, &ipv4_udp_esp_tmplt},
{iavf_pattern_eth_ipv4_ah, IAVF_RSS_TYPE_IPV4_AH, &ipv4_ah_tmplt},
@@ -452,6 +504,30 @@ static struct iavf_pattern_match_item iavf_hash_pattern_list[] = {
{iavf_pattern_eth_ipv6_gtpu_eh_ipv6, IAVF_RSS_TYPE_GTPU_IPV6, &inner_ipv6_tmplt},
{iavf_pattern_eth_ipv6_gtpu_eh_ipv6_udp, IAVF_RSS_TYPE_GTPU_IPV6_UDP, &inner_ipv6_udp_tmplt},
{iavf_pattern_eth_ipv6_gtpu_eh_ipv6_tcp, IAVF_RSS_TYPE_GTPU_IPV6_TCP, &inner_ipv6_tcp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_ipv6, IAVF_RSS_TYPE_GTPU_IPV6, &second_inner_ipv6_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_ipv6_udp, IAVF_RSS_TYPE_GTPU_IPV6_UDP, &second_inner_ipv6_udp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_ipv6_tcp, IAVF_RSS_TYPE_GTPU_IPV6_TCP, &second_inner_ipv6_tcp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_ipv6, IAVF_RSS_TYPE_GTPU_IPV6, &second_inner_ipv6_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_ipv6_udp, IAVF_RSS_TYPE_GTPU_IPV6_UDP, &second_inner_ipv6_udp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_ipv6_tcp, IAVF_RSS_TYPE_GTPU_IPV6_TCP, &second_inner_ipv6_tcp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_ipv6, IAVF_RSS_TYPE_GTPU_IPV6, &second_inner_ipv6_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_ipv6_udp, IAVF_RSS_TYPE_GTPU_IPV6_UDP, &second_inner_ipv6_udp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_ipv6_tcp, IAVF_RSS_TYPE_GTPU_IPV6_TCP, &second_inner_ipv6_tcp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_ipv6, IAVF_RSS_TYPE_GTPU_IPV6, &second_inner_ipv6_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_ipv6_udp, IAVF_RSS_TYPE_GTPU_IPV6_UDP, &second_inner_ipv6_udp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_ipv6_tcp, IAVF_RSS_TYPE_GTPU_IPV6_TCP, &second_inner_ipv6_tcp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_eh_ipv6, IAVF_RSS_TYPE_GTPU_IPV6, &second_inner_ipv6_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_eh_ipv6_udp, IAVF_RSS_TYPE_GTPU_IPV6_UDP, &second_inner_ipv6_udp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv4_gtpu_eh_ipv6_tcp, IAVF_RSS_TYPE_GTPU_IPV6_TCP, &second_inner_ipv6_tcp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_eh_ipv6, IAVF_RSS_TYPE_GTPU_IPV6, &second_inner_ipv6_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_eh_ipv6_udp, IAVF_RSS_TYPE_GTPU_IPV6_UDP, &second_inner_ipv6_udp_tmplt},
+ {iavf_pattern_eth_ipv4_gre_ipv6_gtpu_eh_ipv6_tcp, IAVF_RSS_TYPE_GTPU_IPV6_TCP, &second_inner_ipv6_tcp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_eh_ipv6, IAVF_RSS_TYPE_GTPU_IPV6, &second_inner_ipv6_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_eh_ipv6_udp, IAVF_RSS_TYPE_GTPU_IPV6_UDP, &second_inner_ipv6_udp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv4_gtpu_eh_ipv6_tcp, IAVF_RSS_TYPE_GTPU_IPV6_TCP, &second_inner_ipv6_tcp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_eh_ipv6, IAVF_RSS_TYPE_GTPU_IPV6, &second_inner_ipv6_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_eh_ipv6_udp, IAVF_RSS_TYPE_GTPU_IPV6_UDP, &second_inner_ipv6_udp_tmplt},
+ {iavf_pattern_eth_ipv6_gre_ipv6_gtpu_eh_ipv6_tcp, IAVF_RSS_TYPE_GTPU_IPV6_TCP, &second_inner_ipv6_tcp_tmplt},
{iavf_pattern_eth_ipv6_esp, IAVF_RSS_TYPE_IPV6_ESP, &ipv6_esp_tmplt},
{iavf_pattern_eth_ipv6_udp_esp, IAVF_RSS_TYPE_IPV6_ESP, &ipv6_udp_esp_tmplt},
{iavf_pattern_eth_ipv6_ah, IAVF_RSS_TYPE_IPV6_AH, &ipv6_ah_tmplt},
@@ -592,12 +668,16 @@ iavf_hash_parse_pattern(const struct rte_flow_item pattern[], uint64_t *phint,
switch (item->type) {
case RTE_FLOW_ITEM_TYPE_IPV4:
- if (!(*phint & IAVF_PHINT_GTPU_MSK))
+ if (!(*phint & IAVF_PHINT_GTPU_MSK) && !(*phint & IAVF_PHINT_GRE))
*phint |= IAVF_PHINT_OUTER_IPV4;
+ if ((*phint & IAVF_PHINT_GRE) && !(*phint & IAVF_PHINT_GTPU_MSK))
+ *phint |= IAVF_PHINT_MID_IPV4;
break;
case RTE_FLOW_ITEM_TYPE_IPV6:
- if (!(*phint & IAVF_PHINT_GTPU_MSK))
+ if (!(*phint & IAVF_PHINT_GTPU_MSK) && !(*phint & IAVF_PHINT_GRE))
*phint |= IAVF_PHINT_OUTER_IPV6;
+ if ((*phint & IAVF_PHINT_GRE) && !(*phint & IAVF_PHINT_GTPU_MSK))
+ *phint |= IAVF_PHINT_MID_IPV6;
break;
case RTE_FLOW_ITEM_TYPE_GTPU:
*phint |= IAVF_PHINT_GTPU;
@@ -627,6 +707,8 @@ iavf_hash_parse_pattern(const struct rte_flow_item pattern[], uint64_t *phint,
return -rte_errno;
}
break;
+ case RTE_FLOW_ITEM_TYPE_GRE:
+ *phint |= IAVF_PHINT_GRE;
default:
break;
}
@@ -866,14 +948,15 @@ iavf_refine_proto_hdrs_by_pattern(struct virtchnl_proto_hdrs *proto_hdrs,
struct virtchnl_proto_hdr *hdr1;
struct virtchnl_proto_hdr *hdr2;
int i, shift_count = 1;
+ int tun_lvl = proto_hdrs->tunnel_level;
- if (!(phint & IAVF_PHINT_GTPU_MSK))
+ if (!(phint & IAVF_PHINT_GTPU_MSK) && !(phint & IAVF_PHINT_GRE))
return;
- if (phint & IAVF_PHINT_LAYERS_MSK)
- shift_count++;
+ while (tun_lvl) {
+ if (phint & IAVF_PHINT_LAYERS_MSK)
+ shift_count = 2;
- if (proto_hdrs->tunnel_level == TUNNEL_LEVEL_INNER) {
/* shift headers layer */
for (i = proto_hdrs->count - 1 + shift_count;
i > shift_count - 1; i--) {
@@ -883,36 +966,53 @@ iavf_refine_proto_hdrs_by_pattern(struct virtchnl_proto_hdrs *proto_hdrs,
}
if (shift_count == 1) {
- /* adding gtpu header at layer 0 */
+ /* adding tunnel header at layer 0 */
hdr1 = &proto_hdrs->proto_hdr[0];
} else {
- /* adding gtpu header and outer ip header */
+ /* adding tunnel header and outer ip header */
hdr1 = &proto_hdrs->proto_hdr[1];
hdr2 = &proto_hdrs->proto_hdr[0];
hdr2->field_selector = 0;
proto_hdrs->count++;
- proto_hdrs->tunnel_level = TUNNEL_LEVEL_OUTER;
+ tun_lvl--;
- if (phint & IAVF_PHINT_OUTER_IPV4)
- VIRTCHNL_SET_PROTO_HDR_TYPE(hdr2, IPV4);
- else if (phint & IAVF_PHINT_OUTER_IPV6)
- VIRTCHNL_SET_PROTO_HDR_TYPE(hdr2, IPV6);
+ if (tun_lvl == TUNNEL_LEVEL_OUTER) {
+ if (phint & IAVF_PHINT_OUTER_IPV4)
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr2, IPV4);
+ else if (phint & IAVF_PHINT_OUTER_IPV6)
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr2, IPV6);
+ }
+ else if (tun_lvl == TUNNEL_LEVEL_INNER) {
+ if (phint & IAVF_PHINT_MID_IPV4)
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr2, IPV4);
+ else if (phint & IAVF_PHINT_MID_IPV6)
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr2, IPV6);
+ }
}
- } else {
- hdr1 = &proto_hdrs->proto_hdr[proto_hdrs->count];
- }
- hdr1->field_selector = 0;
- proto_hdrs->count++;
-
- if (phint & IAVF_PHINT_GTPU_EH_DWN)
- VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GTPU_EH_PDU_DWN);
- else if (phint & IAVF_PHINT_GTPU_EH_UP)
- VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GTPU_EH_PDU_UP);
- else if (phint & IAVF_PHINT_GTPU_EH)
- VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GTPU_EH);
- else if (phint & IAVF_PHINT_GTPU)
- VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GTPU_IP);
+ hdr1->field_selector = 0;
+ proto_hdrs->count++;
+
+ if (phint & IAVF_PHINT_GTPU_EH_DWN)
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GTPU_EH_PDU_DWN);
+ else if (phint & IAVF_PHINT_GTPU_EH_UP)
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GTPU_EH_PDU_UP);
+ else if (phint & IAVF_PHINT_GTPU_EH)
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GTPU_EH);
+ else if (phint & IAVF_PHINT_GTPU)
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GTPU_IP);
+
+ if (phint & IAVF_PHINT_GRE) {
+ if(phint & IAVF_PHINT_GTPU) {
+ /* if GTPoGRE, add GRE header at the outer tunnel */
+ if (tun_lvl == TUNNEL_LEVEL_OUTER)
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GRE);
+ } else {
+ VIRTCHNL_SET_PROTO_HDR_TYPE(hdr1, GRE);
+ }
+ }
+ }
+ proto_hdrs->tunnel_level = tun_lvl;
}
static void iavf_refine_proto_hdrs(struct virtchnl_proto_hdrs *proto_hdrs,
--
2.25.1
next prev parent reply other threads:[~2021-06-10 6:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 13:05 [dpdk-dev] [PATCH v5 0/4] support AVF RSS and FDIR " Lingyu Liu
2021-06-10 13:05 ` [dpdk-dev] [PATCH v5 1/4] net/iavf: support flow pattern for GTPoGRE Lingyu Liu
2021-06-10 13:05 ` [dpdk-dev] [PATCH v5 2/4] common/iavf: add header types for GRE Lingyu Liu
2021-06-10 13:05 ` [dpdk-dev] [PATCH v5 3/4] net/iavf: support AVF FDIR for GTPoGRE tunnel packet Lingyu Liu
2021-06-10 13:05 ` Lingyu Liu [this message]
2021-06-21 14:23 ` [dpdk-dev] [PATCH v6 0/3] support AVF RSS and FDIR for GTPoGRE packet Lingyu Liu
2021-06-21 8:26 ` Zhang, Qi Z
2021-06-21 14:23 ` [dpdk-dev] [PATCH v6 1/3] net/iavf: support flow pattern for GTPoGRE Lingyu Liu
2021-06-21 14:23 ` [dpdk-dev] [PATCH v6 2/3] net/iavf: support AVF FDIR for GTPoGRE tunnel packet Lingyu Liu
2021-06-21 14:23 ` [dpdk-dev] [PATCH v6 3/3] net/iavf: support AVF RSS for GTPoGRE packet Lingyu Liu
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=20210610130520.713482-5-lingyu.liu@intel.com \
--to=lingyu.liu@intel.com \
--cc=beilei.xing@intel.com \
--cc=dev@dpdk.org \
--cc=jingjing.wu@intel.com \
--cc=junfeng.guo@intel.com \
--cc=qi.z.zhang@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).