From: Bingbin Chen <chen.bingbin@zte.com.cn>
To: dev@dpdk.org
Cc: Bingbin Chen <chen.bingbin@zte.com.cn>
Subject: [PATCH v1 14/14] net/zxdh: clean stat values
Date: Mon, 10 Feb 2025 09:50:17 +0800 [thread overview]
Message-ID: <20250210015017.4105624-9-chen.bingbin@zte.com.cn> (raw)
In-Reply-To: <20250210015017.4105624-1-chen.bingbin@zte.com.cn>
[-- Attachment #1.1.1: Type: text/plain, Size: 12934 bytes --]
Implement stat values clean operation by agent channel.
Signed-off-by: Bingbin Chen <chen.bingbin@zte.com.cn>
---
drivers/net/zxdh/zxdh_ethdev_ops.c | 4 +
drivers/net/zxdh/zxdh_np.c | 344 +++++++++++++++++++++++++++++
drivers/net/zxdh/zxdh_np.h | 23 +-
3 files changed, 370 insertions(+), 1 deletion(-)
diff --git a/drivers/net/zxdh/zxdh_ethdev_ops.c b/drivers/net/zxdh/zxdh_ethdev_ops.c
index 1a21ded58e..284bf27d10 100644
--- a/drivers/net/zxdh/zxdh_ethdev_ops.c
+++ b/drivers/net/zxdh/zxdh_ethdev_ops.c
@@ -1500,11 +1500,15 @@ static int zxdh_hw_stats_reset(struct rte_eth_dev *dev, enum zxdh_agent_msg_type
int zxdh_dev_stats_reset(struct rte_eth_dev *dev)
{
struct zxdh_hw *hw = dev->data->dev_private;
+ uint64_t stats_data;
zxdh_hw_stats_reset(dev, ZXDH_VQM_DEV_STATS_RESET);
if (hw->is_pf)
zxdh_hw_stats_reset(dev, ZXDH_MAC_STATS_RESET);
+ zxdh_np_stat_ppu_cnt_get_ex(0, ZXDH_STAT_64_MODE, 0,
+ ZXDH_STAT_RD_CLR_MODE_CLR, (uint32_t *)&stats_data);
+
return 0;
}
diff --git a/drivers/net/zxdh/zxdh_np.c b/drivers/net/zxdh/zxdh_np.c
index 9de3e2f406..e4d360c8f5 100644
--- a/drivers/net/zxdh/zxdh_np.c
+++ b/drivers/net/zxdh/zxdh_np.c
@@ -3420,6 +3420,37 @@ zxdh_np_reg_read(uint32_t dev_id, uint32_t reg_no,
return rc;
}
+static uint32_t
+zxdh_np_reg_read32(uint32_t dev_id, uint32_t reg_no,
+ uint32_t m_offset, uint32_t n_offset, uint32_t *p_data)
+{
+ uint32_t rc = 0;
+ uint32_t addr = 0;
+ uint32_t reg_type = 0;
+ uint32_t reg_module = 0;
+ ZXDH_REG_T *p_reg_info = NULL;
+ uint32_t p_buff[ZXDH_REG_DATA_MAX] = {0};
+ uint32_t reg_real_no = 0;
+
+ p_reg_info = &g_dpp_reg_info[reg_no];
+ reg_module = p_reg_info->module_no;
+ reg_type = p_reg_info->flags;
+ reg_real_no = p_reg_info->reg_no;
+
+ addr = zxdh_np_reg_get_reg_addr(reg_no, m_offset, n_offset);
+
+ if (reg_module == DTB4K) {
+ rc = p_reg_info->p_read_fun(dev_id, addr, p_data);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "p_reg_info->p_read_fun");
+ } else {
+ rc = zxdh_np_agent_channel_reg_read(dev_id, reg_type, reg_real_no, 4, addr, p_buff);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_agent_channel_reg_read");
+ *p_data = p_buff[0];
+ }
+
+ return rc;
+}
+
static uint32_t
zxdh_np_dtb_queue_vm_info_get(uint32_t dev_id,
uint32_t queue_id,
@@ -10678,3 +10709,316 @@ zxdh_np_dtb_hash_offline_delete(uint32_t dev_id,
return rc;
}
+
+static uint32_t
+zxdh_np_se_done_status_check(uint32_t dev_id, uint32_t reg_no, uint32_t pos)
+{
+ uint32_t rc = ZXDH_OK;
+
+ uint32_t data = 0;
+ uint32_t rd_cnt = 0;
+ uint32_t done_flag = 0;
+
+ while (!done_flag) {
+ rc = zxdh_np_reg_read32(dev_id, reg_no, 0, 0, &data);
+ if (rc != ZXDH_OK) {
+ PMD_DRV_LOG(ERR, " [ErrorCode:0x%x] !-- zxdh_np_reg_read32 Fail!", rc);
+ return rc;
+ }
+
+ done_flag = (data >> pos) & 0x1;
+
+ if (done_flag)
+ break;
+
+ if (rd_cnt > ZXDH_RD_CNT_MAX * ZXDH_RD_CNT_MAX)
+ return ZXDH_ERR;
+
+ rd_cnt++;
+ }
+
+ return rc;
+}
+
+static uint32_t
+zxdh_np_se_smmu0_ind_read(uint32_t dev_id,
+ uint32_t base_addr,
+ uint32_t index,
+ uint32_t rd_mode,
+ uint32_t rd_clr_mode,
+ uint32_t *p_data)
+{
+ uint32_t rc = ZXDH_OK;
+ uint32_t i = 0;
+ uint32_t row_index = 0;
+ uint32_t col_index = 0;
+ uint32_t temp_data[4] = {0};
+ uint32_t *p_temp_data = NULL;
+ ZXDH_SMMU0_SMMU0_CPU_IND_CMD_T cpu_ind_cmd = {0};
+ ZXDH_MUTEX_T *p_ind_mutex = NULL;
+
+ rc = zxdh_np_dev_opr_mutex_get(dev_id, ZXDH_DEV_MUTEX_T_SMMU0, &p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_dev_opr_mutex_get");
+
+ rc = zxdh_np_comm_mutex_lock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_lock");
+
+ rc = zxdh_np_se_done_status_check(dev_id, ZXDH_SMMU0_SMMU0_WR_ARB_CPU_RDYR, 0);
+ ZXDH_COMM_CHECK_DEV_RC_UNLOCK(dev_id, rc, "zxdh_np_se_done_status_check", p_ind_mutex);
+
+ if (rd_clr_mode == ZXDH_RD_MODE_HOLD) {
+ cpu_ind_cmd.cpu_ind_rw = ZXDH_SE_OPR_RD;
+ cpu_ind_cmd.cpu_ind_rd_mode = ZXDH_RD_MODE_HOLD;
+ cpu_ind_cmd.cpu_req_mode = ZXDH_ERAM128_OPR_128b;
+
+ switch (rd_mode) {
+ case ZXDH_ERAM128_OPR_128b:
+ {
+ if ((0xFFFFFFFF - (base_addr)) < (index)) {
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ PMD_DRV_LOG(ERR, "%s : index 0x%x is invalid!", __func__, index);
+ return ZXDH_PAR_CHK_INVALID_INDEX;
+ }
+ if (base_addr + index > ZXDH_SE_SMMU0_ERAM_ADDR_NUM_TOTAL - 1) {
+ PMD_DRV_LOG(ERR, "%s : index out of range !", __func__);
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ return ZXDH_ERR;
+ }
+
+ row_index = (index << 7) & ZXDH_ERAM128_BADDR_MASK;
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_64b:
+ {
+ if ((base_addr + (index >> 1)) > ZXDH_SE_SMMU0_ERAM_ADDR_NUM_TOTAL - 1) {
+ PMD_DRV_LOG(ERR, "%s : index out of range !", __func__);
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ return ZXDH_ERR;
+ }
+
+ row_index = (index << 6) & ZXDH_ERAM128_BADDR_MASK;
+ col_index = index & 0x1;
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_32b:
+ {
+ if ((base_addr + (index >> 2)) > ZXDH_SE_SMMU0_ERAM_ADDR_NUM_TOTAL - 1) {
+ PMD_DRV_LOG(ERR, "%s : index out of range !", __func__);
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ return ZXDH_ERR;
+ }
+
+ row_index = (index << 5) & ZXDH_ERAM128_BADDR_MASK;
+ col_index = index & 0x3;
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_1b:
+ {
+ if ((base_addr + (index >> 7)) > ZXDH_SE_SMMU0_ERAM_ADDR_NUM_TOTAL - 1) {
+ PMD_DRV_LOG(ERR, "%s : index out of range !", __func__);
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ return ZXDH_ERR;
+ }
+
+ row_index = index & ZXDH_ERAM128_BADDR_MASK;
+ col_index = index & 0x7F;
+ break;
+ }
+ }
+
+ cpu_ind_cmd.cpu_ind_addr = ((base_addr << 7) & ZXDH_ERAM128_BADDR_MASK) + row_index;
+ } else {
+ cpu_ind_cmd.cpu_ind_rw = ZXDH_SE_OPR_RD;
+ cpu_ind_cmd.cpu_ind_rd_mode = ZXDH_RD_MODE_CLEAR;
+
+ switch (rd_mode) {
+ case ZXDH_ERAM128_OPR_128b:
+ {
+ if ((0xFFFFFFFF - (base_addr)) < (index)) {
+ PMD_DRV_LOG(ERR, "%s : index 0x%x is invalid!", __func__, index);
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ return ZXDH_PAR_CHK_INVALID_INDEX;
+ }
+
+ if (base_addr + index > ZXDH_SE_SMMU0_ERAM_ADDR_NUM_TOTAL - 1) {
+ PMD_DRV_LOG(ERR, "%s : index out of range !", __func__);
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ return ZXDH_ERR;
+ }
+
+ row_index = (index << 7);
+ cpu_ind_cmd.cpu_req_mode = ZXDH_ERAM128_OPR_128b;
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_64b:
+ {
+ if ((base_addr + (index >> 1)) > ZXDH_SE_SMMU0_ERAM_ADDR_NUM_TOTAL - 1) {
+ PMD_DRV_LOG(ERR, "%s : index out of range !", __func__);
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ return ZXDH_ERR;
+ }
+
+ row_index = (index << 6);
+ cpu_ind_cmd.cpu_req_mode = 2;
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_32b:
+ {
+ if ((base_addr + (index >> 2)) > ZXDH_SE_SMMU0_ERAM_ADDR_NUM_TOTAL - 1) {
+ PMD_DRV_LOG(ERR, "%s : index out of range !", __func__);
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ return ZXDH_ERR;
+ }
+
+ row_index = (index << 5);
+ cpu_ind_cmd.cpu_req_mode = 1;
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_1b:
+ {
+ PMD_DRV_LOG(ERR, "rd_clr_mode[%d] or rd_mode[%d] error! ",
+ rd_clr_mode, rd_mode);
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+ RTE_ASSERT(0);
+ return ZXDH_ERR;
+ }
+ }
+
+ cpu_ind_cmd.cpu_ind_addr = ((base_addr << 7) & ZXDH_ERAM128_BADDR_MASK) + row_index;
+ }
+
+ rc = zxdh_np_reg_write(dev_id,
+ ZXDH_SMMU0_SMMU0_CPU_IND_CMDR,
+ 0,
+ 0,
+ &cpu_ind_cmd);
+ ZXDH_COMM_CHECK_DEV_RC_UNLOCK(dev_id, rc, "zxdh_np_reg_write", p_ind_mutex);
+
+ rc = zxdh_np_se_done_status_check(dev_id, ZXDH_SMMU0_SMMU0_CPU_IND_RD_DONER, 0);
+ ZXDH_COMM_CHECK_DEV_RC_UNLOCK(dev_id, rc,
+ "zxdh_np_se_done_status_check", p_ind_mutex);
+
+ p_temp_data = temp_data;
+ for (i = 0; i < 4; i++) {
+ rc = zxdh_np_reg_read(dev_id,
+ ZXDH_SMMU0_SMMU0_CPU_IND_RDAT0R + i,
+ 0,
+ 0,
+ p_temp_data + 3 - i);
+ ZXDH_COMM_CHECK_DEV_RC_UNLOCK(dev_id, rc, "zxdh_np_reg_read", p_ind_mutex);
+ }
+
+ if (rd_clr_mode == ZXDH_RD_MODE_HOLD) {
+ switch (rd_mode) {
+ case ZXDH_ERAM128_OPR_128b:
+ {
+ rte_memcpy(p_data, p_temp_data, (128 / 8));
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_64b:
+ {
+ rte_memcpy(p_data, p_temp_data + ((1 - col_index) << 1), (64 / 8));
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_32b:
+ {
+ rte_memcpy(p_data, p_temp_data + ((3 - col_index)), (32 / 8));
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_1b:
+ {
+ ZXDH_COMM_UINT32_GET_BITS(p_data[0],
+ *(p_temp_data + (3 - col_index / 32)), (col_index % 32), 1);
+ break;
+ }
+ }
+ } else {
+ switch (rd_mode) {
+ case ZXDH_ERAM128_OPR_128b:
+ {
+ rte_memcpy(p_data, p_temp_data, (128 / 8));
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_64b:
+ {
+ rte_memcpy(p_data, p_temp_data, (64 / 8));
+ break;
+ }
+
+ case ZXDH_ERAM128_OPR_32b:
+ {
+ rte_memcpy(p_data, p_temp_data, (64 / 8));
+ break;
+ }
+ }
+ }
+
+ rc = zxdh_np_comm_mutex_unlock(p_ind_mutex);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_comm_mutex_unlock");
+
+ return rc;
+}
+
+uint32_t
+zxdh_np_stat_ppu_cnt_get_ex(uint32_t dev_id,
+ ZXDH_STAT_CNT_MODE_E rd_mode,
+ uint32_t index,
+ uint32_t clr_mode,
+ uint32_t *p_data)
+{
+ uint32_t rc = ZXDH_OK;
+ uint32_t ppu_eram_baddr = 0;
+ uint32_t ppu_eram_depth = 0;
+ uint32_t eram_rd_mode = 0;
+ uint32_t eram_clr_mode = 0;
+ ZXDH_PPU_STAT_CFG_T stat_cfg = {0};
+
+ zxdh_np_stat_cfg_soft_get(dev_id, &stat_cfg);
+
+ ppu_eram_depth = stat_cfg.eram_depth;
+ ppu_eram_baddr = stat_cfg.eram_baddr;
+
+ if ((index >> (ZXDH_STAT_128_MODE - rd_mode)) < ppu_eram_depth) {
+ if (rd_mode == ZXDH_STAT_128_MODE)
+ eram_rd_mode = ZXDH_ERAM128_OPR_128b;
+ else
+ eram_rd_mode = ZXDH_ERAM128_OPR_64b;
+
+ if (clr_mode == ZXDH_STAT_RD_CLR_MODE_UNCLR)
+ eram_clr_mode = ZXDH_RD_MODE_HOLD;
+ else
+ eram_clr_mode = ZXDH_RD_MODE_CLEAR;
+
+ rc = zxdh_np_se_smmu0_ind_read(dev_id,
+ ppu_eram_baddr,
+ index,
+ eram_rd_mode,
+ eram_clr_mode,
+ p_data);
+ ZXDH_COMM_CHECK_DEV_RC(dev_id, rc, "zxdh_np_se_smmu0_ind_read");
+ } else {
+ PMD_DRV_LOG(ERR, "DPDK DONT HAVE DDR STAT.");
+ }
+
+ return rc;
+}
diff --git a/drivers/net/zxdh/zxdh_np.h b/drivers/net/zxdh/zxdh_np.h
index 08a9b3c3a6..bcb4699c6f 100644
--- a/drivers/net/zxdh/zxdh_np.h
+++ b/drivers/net/zxdh/zxdh_np.h
@@ -1188,6 +1188,12 @@ typedef struct zxdh_dtb4k_dtb_enq_cfg_epid_v_func_num_0_127_t {
uint32_t cfg_vfunc_active;
} ZXDH_DTB4K_DTB_ENQ_CFG_EPID_V_FUNC_NUM_0_127_T;
+typedef struct zxdh_smmu0_smmu0_cpu_ind_cmd_t {
+ uint32_t cpu_ind_rw;
+ uint32_t cpu_ind_rd_mode;
+ uint32_t cpu_req_mode;
+ uint32_t cpu_ind_addr;
+} ZXDH_SMMU0_SMMU0_CPU_IND_CMD_T;
typedef uint32_t (*ZXDH_REG_WRITE)(uint32_t dev_id, uint32_t addr, uint32_t *p_data);
typedef uint32_t (*ZXDH_REG_READ)(uint32_t dev_id, uint32_t addr, uint32_t *p_data);
@@ -1498,6 +1504,17 @@ typedef enum zxdh_stat_cnt_mode_e {
ZXDH_STAT_MAX_MODE,
} ZXDH_STAT_CNT_MODE_E;
+typedef enum zxdh_stat_rd_clr_mode_e {
+ ZXDH_STAT_RD_CLR_MODE_UNCLR = 0,
+ ZXDH_STAT_RD_CLR_MODE_CLR = 1,
+ ZXDH_STAT_RD_CLR_MODE_MAX,
+} STAT_RD_CLR_MODE_E;
+
+typedef enum zxdh_eram128_rd_clr_mode_e {
+ ZXDH_RD_MODE_HOLD = 0,
+ ZXDH_RD_MODE_CLEAR = 1,
+} ZXDH_ERAM128_RD_CLR_MODE_E;
+
typedef enum zxdh_np_agent_msg_type_e {
ZXDH_REG_MSG = 0,
ZXDH_DTB_MSG,
@@ -1741,5 +1758,9 @@ uint32_t zxdh_np_dtb_hash_offline_delete(uint32_t dev_id,
uint32_t queue_id,
uint32_t sdt_no,
__rte_unused uint32_t flush_mode);
-
+uint32_t zxdh_np_stat_ppu_cnt_get_ex(uint32_t dev_id,
+ ZXDH_STAT_CNT_MODE_E rd_mode,
+ uint32_t index,
+ uint32_t clr_mode,
+ uint32_t *p_data);
#endif /* ZXDH_NP_H */
--
2.27.0
[-- Attachment #1.1.2: Type: text/html , Size: 37723 bytes --]
next prev parent reply other threads:[~2025-02-10 2:03 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-10 1:44 [PATCH v1 01/14] net/zxdh: add network processor registers ops Bingbin Chen
2025-02-10 1:46 ` [PATCH v1 02/14] net/zxdh: support compatibility check Bingbin Chen
2025-02-10 17:25 ` Stephen Hemminger
2025-02-10 1:47 ` [PATCH v1 03/14] net/zxdh: add agent channel Bingbin Chen
2025-02-10 17:28 ` Stephen Hemminger
2025-02-10 17:30 ` Stephen Hemminger
2025-02-10 17:31 ` Stephen Hemminger
2025-02-10 18:23 ` Stephen Hemminger
2025-02-10 1:47 ` [PATCH v1 04/14] net/zxdh: modify dtb queue ops Bingbin Chen
2025-02-10 17:31 ` Stephen Hemminger
2025-02-10 1:48 ` [PATCH v1 05/14] net/zxdh: add tables dump address ops Bingbin Chen
2025-02-10 17:33 ` Stephen Hemminger
2025-02-10 1:50 ` [PATCH v1 06/14] net/zxdh: add eram tables ops Bingbin Chen
2025-02-10 1:50 ` [PATCH v1 07/14] net/zxdh: get flow tables resources Bingbin Chen
2025-02-10 17:35 ` Stephen Hemminger
2025-02-10 17:35 ` Stephen Hemminger
2025-02-10 1:50 ` [PATCH v1 08/14] net/zxdh: support hash resources configuration Bingbin Chen
2025-02-10 17:36 ` Stephen Hemminger
2025-02-10 1:50 ` [PATCH v1 09/14] net/zxdh: implement tables initialization Bingbin Chen
2025-02-10 17:40 ` Stephen Hemminger
2025-02-10 17:43 ` Stephen Hemminger
2025-02-10 1:50 ` [PATCH v1 10/14] net/zxdh: support hash tables write and delete ops Bingbin Chen
2025-02-10 17:45 ` Stephen Hemminger
2025-02-10 1:50 ` [PATCH v1 11/14] net/zxdh: get hash table entry result Bingbin Chen
2025-02-10 17:46 ` Stephen Hemminger
2025-02-10 1:50 ` [PATCH v1 12/14] net/zxdh: delete all hash entries Bingbin Chen
2025-02-10 17:47 ` Stephen Hemminger
2025-02-10 1:50 ` [PATCH v1 13/14] net/zxdh: add acl tables ops Bingbin Chen
2025-02-10 1:50 ` Bingbin Chen [this message]
2025-02-10 17:50 ` [PATCH v1 14/14] net/zxdh: clean stat values Stephen Hemminger
2025-02-10 17:50 ` Stephen Hemminger
2025-02-10 18:19 ` Stephen Hemminger
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=20250210015017.4105624-9-chen.bingbin@zte.com.cn \
--to=chen.bingbin@zte.com.cn \
--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).