[PATCH net-next 0/3] bnxt_en: Updates

[PATCH net-next 0/3] bnxt_en: Updates

[Michael Chan]

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This small patchset adds an improvement to the configuration of ethtool
RSS tuple hash and a PTP improvement when running in a multi-host
environment.

Edwin Peer (2):
  bnxt_en: refactor VNIC RSS update functions
  bnxt_en: update RSS config using difference algorithm

Pavan Chebbi (1):
  bnxt_en: Add a non-real time mode to access NIC clock

 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 72 ++++++++++++++-----
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  2 +
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  2 +
 drivers/net/ethernet/broadcom/bnxt/bnxt_hsi.h | 47 ++++++++++++
 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 45 ++++++++----
 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h |  7 +-
 6 files changed, 142 insertions(+), 33 deletions(-)

-- 
2.18.1


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[PATCH net-next 1/3] bnxt_en: refactor VNIC RSS update functions

[Michael Chan]

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From: Edwin Peer <edwin.peer@broadcom.com>

Extract common code into a new function. This will avoid duplication
in the next patch, which changes the update algorithm for both the P5
and legacy code paths.

No functional changes.

Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 34 +++++++++++------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 03272aa48511..15edb6cb3656 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -5250,7 +5250,7 @@ int bnxt_get_nr_rss_ctxs(struct bnxt *bp, int rx_rings)
 	return 1;
 }
 
-static void __bnxt_fill_hw_rss_tbl(struct bnxt *bp, struct bnxt_vnic_info *vnic)
+static void bnxt_fill_hw_rss_tbl(struct bnxt *bp, struct bnxt_vnic_info *vnic)
 {
 	bool no_rss = !(vnic->flags & BNXT_VNIC_RSS_FLAG);
 	u16 i, j;
@@ -5263,8 +5263,8 @@ static void __bnxt_fill_hw_rss_tbl(struct bnxt *bp, struct bnxt_vnic_info *vnic)
 	}
 }
 
-static void __bnxt_fill_hw_rss_tbl_p5(struct bnxt *bp,
-				      struct bnxt_vnic_info *vnic)
+static void bnxt_fill_hw_rss_tbl_p5(struct bnxt *bp,
+				    struct bnxt_vnic_info *vnic)
 {
 	__le16 *ring_tbl = vnic->rss_table;
 	struct bnxt_rx_ring_info *rxr;
@@ -5285,12 +5285,19 @@ static void __bnxt_fill_hw_rss_tbl_p5(struct bnxt *bp,
 	}
 }
 
-static void bnxt_fill_hw_rss_tbl(struct bnxt *bp, struct bnxt_vnic_info *vnic)
+static void
+__bnxt_hwrm_vnic_set_rss(struct bnxt *bp, struct hwrm_vnic_rss_cfg_input *req,
+			 struct bnxt_vnic_info *vnic)
 {
 	if (bp->flags & BNXT_FLAG_CHIP_P5)
-		__bnxt_fill_hw_rss_tbl_p5(bp, vnic);
+		bnxt_fill_hw_rss_tbl_p5(bp, vnic);
 	else
-		__bnxt_fill_hw_rss_tbl(bp, vnic);
+		bnxt_fill_hw_rss_tbl(bp, vnic);
+
+	req->hash_type = cpu_to_le32(bp->rss_hash_cfg);
+	req->hash_mode_flags = VNIC_RSS_CFG_REQ_HASH_MODE_FLAGS_DEFAULT;
+	req->ring_grp_tbl_addr = cpu_to_le64(vnic->rss_table_dma_addr);
+	req->hash_key_tbl_addr = cpu_to_le64(vnic->rss_hash_key_dma_addr);
 }
 
 static int bnxt_hwrm_vnic_set_rss(struct bnxt *bp, u16 vnic_id, bool set_rss)
@@ -5307,14 +5314,8 @@ static int bnxt_hwrm_vnic_set_rss(struct bnxt *bp, u16 vnic_id, bool set_rss)
 	if (rc)
 		return rc;
 
-	if (set_rss) {
-		bnxt_fill_hw_rss_tbl(bp, vnic);
-		req->hash_type = cpu_to_le32(bp->rss_hash_cfg);
-		req->hash_mode_flags = VNIC_RSS_CFG_REQ_HASH_MODE_FLAGS_DEFAULT;
-		req->ring_grp_tbl_addr = cpu_to_le64(vnic->rss_table_dma_addr);
-		req->hash_key_tbl_addr =
-			cpu_to_le64(vnic->rss_hash_key_dma_addr);
-	}
+	if (set_rss)
+		__bnxt_hwrm_vnic_set_rss(bp, req, vnic);
 	req->rss_ctx_idx = cpu_to_le16(vnic->fw_rss_cos_lb_ctx[0]);
 	return hwrm_req_send(bp, req);
 }
@@ -5335,10 +5336,7 @@ static int bnxt_hwrm_vnic_set_rss_p5(struct bnxt *bp, u16 vnic_id, bool set_rss)
 	if (!set_rss)
 		return hwrm_req_send(bp, req);
 
-	bnxt_fill_hw_rss_tbl(bp, vnic);
-	req->hash_type = cpu_to_le32(bp->rss_hash_cfg);
-	req->hash_mode_flags = VNIC_RSS_CFG_REQ_HASH_MODE_FLAGS_DEFAULT;
-	req->hash_key_tbl_addr = cpu_to_le64(vnic->rss_hash_key_dma_addr);
+	__bnxt_hwrm_vnic_set_rss(bp, req, vnic);
 	ring_tbl_map = vnic->rss_table_dma_addr;
 	nr_ctxs = bnxt_get_nr_rss_ctxs(bp, bp->rx_nr_rings);
 
-- 
2.18.1


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Re: [PATCH net-next 1/3] bnxt_en: refactor VNIC RSS update functions

[Leon Romanovsky]

On Sun, Nov 06, 2022 at 07:16:30PM -0500, Michael Chan wrote:
> From: Edwin Peer <edwin.peer@broadcom.com>
> 
> Extract common code into a new function. This will avoid duplication
> in the next patch, which changes the update algorithm for both the P5
> and legacy code paths.
> 
> No functional changes.
> 
> Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
> Signed-off-by: Michael Chan <michael.chan@broadcom.com>
> ---
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c | 34 +++++++++++------------
>  1 file changed, 16 insertions(+), 18 deletions(-)

<...>

> +static void
> +__bnxt_hwrm_vnic_set_rss(struct bnxt *bp, struct hwrm_vnic_rss_cfg_input *req,
> +			 struct bnxt_vnic_info *vnic)

The "__" prefix in __func_name() usually means in kernel that this function
is locked externally.

Thanks,
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>

[PATCH net-next 2/3] bnxt_en: update RSS config using difference algorithm

[Michael Chan]

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From: Edwin Peer <edwin.peer@broadcom.com>

Hardware is unable to realize all legal firmware interface state values
for hash_type.  For example, if 4-tuple TCP_IPV4 hash is enabled,
4-tuple UDP_IPV4 hash must also be enabled.  By providing the bits the
user intended to change instead of the possible illegal intermediate
states, the firmware is able to make better compromises when deciding
which bits to ignore.

With this new mechansim, we can now report the actual configured hash
back to the user.  Add bnxt_hwrm_update_rss_hash_cfg() to report the
actual hash after user configuration.

Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 35 +++++++++++++-
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  2 +
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  2 +
 drivers/net/ethernet/broadcom/bnxt/bnxt_hsi.h | 47 +++++++++++++++++++
 4 files changed, 85 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 15edb6cb3656..d18e55b16375 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -5294,7 +5294,15 @@ __bnxt_hwrm_vnic_set_rss(struct bnxt *bp, struct hwrm_vnic_rss_cfg_input *req,
 	else
 		bnxt_fill_hw_rss_tbl(bp, vnic);
 
-	req->hash_type = cpu_to_le32(bp->rss_hash_cfg);
+	if (bp->rss_hash_delta) {
+		req->hash_type = cpu_to_le32(bp->rss_hash_delta);
+		if (bp->rss_hash_cfg & bp->rss_hash_delta)
+			req->flags |= VNIC_RSS_CFG_REQ_FLAGS_HASH_TYPE_INCLUDE;
+		else
+			req->flags |= VNIC_RSS_CFG_REQ_FLAGS_HASH_TYPE_EXCLUDE;
+	} else {
+		req->hash_type = cpu_to_le32(bp->rss_hash_cfg);
+	}
 	req->hash_mode_flags = VNIC_RSS_CFG_REQ_HASH_MODE_FLAGS_DEFAULT;
 	req->ring_grp_tbl_addr = cpu_to_le64(vnic->rss_table_dma_addr);
 	req->hash_key_tbl_addr = cpu_to_le64(vnic->rss_hash_key_dma_addr);
@@ -5355,6 +5363,25 @@ static int bnxt_hwrm_vnic_set_rss_p5(struct bnxt *bp, u16 vnic_id, bool set_rss)
 	return rc;
 }
 
+static void bnxt_hwrm_update_rss_hash_cfg(struct bnxt *bp)
+{
+	struct bnxt_vnic_info *vnic = &bp->vnic_info[0];
+	struct hwrm_vnic_rss_qcfg_output *resp;
+	struct hwrm_vnic_rss_qcfg_input *req;
+
+	if (hwrm_req_init(bp, req, HWRM_VNIC_RSS_QCFG))
+		return;
+
+	/* all contexts configured to same hash_type, zero always exists */
+	req->rss_ctx_idx = cpu_to_le16(vnic->fw_rss_cos_lb_ctx[0]);
+	resp = hwrm_req_hold(bp, req);
+	if (!hwrm_req_send(bp, req)) {
+		bp->rss_hash_cfg = le32_to_cpu(resp->hash_type) ?: bp->rss_hash_cfg;
+		bp->rss_hash_delta = 0;
+	}
+	hwrm_req_drop(bp, req);
+}
+
 static int bnxt_hwrm_vnic_set_hds(struct bnxt *bp, u16 vnic_id)
 {
 	struct bnxt_vnic_info *vnic = &bp->vnic_info[vnic_id];
@@ -5612,6 +5639,8 @@ static int bnxt_hwrm_vnic_qcaps(struct bnxt *bp)
 		    (BNXT_CHIP_P5_THOR(bp) &&
 		     !(bp->fw_cap & BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED)))
 			bp->fw_cap |= BNXT_FW_CAP_VLAN_RX_STRIP;
+		if (flags & VNIC_QCAPS_RESP_FLAGS_RSS_HASH_TYPE_DELTA_CAP)
+			bp->fw_cap |= BNXT_FW_CAP_RSS_HASH_TYPE_DELTA;
 		bp->max_tpa_v2 = le16_to_cpu(resp->max_aggs_supported);
 		if (bp->max_tpa_v2) {
 			if (BNXT_CHIP_P5_THOR(bp))
@@ -8806,6 +8835,8 @@ static int bnxt_init_chip(struct bnxt *bp, bool irq_re_init)
 	rc = bnxt_setup_vnic(bp, 0);
 	if (rc)
 		goto err_out;
+	if (bp->fw_cap & BNXT_FW_CAP_RSS_HASH_TYPE_DELTA)
+		bnxt_hwrm_update_rss_hash_cfg(bp);
 
 	if (bp->flags & BNXT_FLAG_RFS) {
 		rc = bnxt_alloc_rfs_vnics(bp);
@@ -12241,6 +12272,8 @@ static void bnxt_set_dflt_rss_hash_type(struct bnxt *bp)
 			   VNIC_RSS_CFG_REQ_HASH_TYPE_TCP_IPV4 |
 			   VNIC_RSS_CFG_REQ_HASH_TYPE_IPV6 |
 			   VNIC_RSS_CFG_REQ_HASH_TYPE_TCP_IPV6;
+	if (bp->fw_cap & BNXT_FW_CAP_RSS_HASH_TYPE_DELTA)
+		bp->rss_hash_delta = bp->rss_hash_cfg;
 	if (BNXT_CHIP_P4_PLUS(bp) && bp->hwrm_spec_code >= 0x10501) {
 		bp->flags |= BNXT_FLAG_UDP_RSS_CAP;
 		bp->rss_hash_cfg |= VNIC_RSS_CFG_REQ_HASH_TYPE_UDP_IPV4 |
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 91a1ba0a914d..7611bed4a196 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1900,6 +1900,7 @@ struct bnxt {
 	u16			*rss_indir_tbl;
 	u16			rss_indir_tbl_entries;
 	u32			rss_hash_cfg;
+	u32			rss_hash_delta;
 
 	u16			max_mtu;
 	u8			max_tc;
@@ -1965,6 +1966,7 @@ struct bnxt {
 	#define BNXT_FW_CAP_CFA_RFS_RING_TBL_IDX_V2	0x00010000
 	#define BNXT_FW_CAP_PCIE_STATS_SUPPORTED	0x00020000
 	#define BNXT_FW_CAP_EXT_STATS_SUPPORTED		0x00040000
+	#define BNXT_FW_CAP_RSS_HASH_TYPE_DELTA		0x00080000
 	#define BNXT_FW_CAP_ERR_RECOVER_RELOAD		0x00100000
 	#define BNXT_FW_CAP_HOT_RESET			0x00200000
 	#define BNXT_FW_CAP_PTP_RTC			0x00400000
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index cc89e5eabcb9..a841b0a47cfd 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1234,6 +1234,8 @@ static int bnxt_srxfh(struct bnxt *bp, struct ethtool_rxnfc *cmd)
 	if (bp->rss_hash_cfg == rss_hash_cfg)
 		return 0;
 
+	if (bp->fw_cap & BNXT_FW_CAP_RSS_HASH_TYPE_DELTA)
+		bp->rss_hash_delta = bp->rss_hash_cfg ^ rss_hash_cfg;
 	bp->rss_hash_cfg = rss_hash_cfg;
 	if (netif_running(bp->dev)) {
 		bnxt_close_nic(bp, false, false);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_hsi.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_hsi.h
index 184dd8d11cd3..2686a714a59f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_hsi.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_hsi.h
@@ -6768,6 +6768,53 @@ struct hwrm_vnic_rss_cfg_cmd_err {
 	u8	unused_0[7];
 };
 
+/* hwrm_vnic_rss_qcfg_input (size:192b/24B) */
+struct hwrm_vnic_rss_qcfg_input {
+	__le16	req_type;
+	__le16	cmpl_ring;
+	__le16	seq_id;
+	__le16	target_id;
+	__le64	resp_addr;
+	__le16	rss_ctx_idx;
+	__le16	vnic_id;
+	u8	unused_0[4];
+};
+
+/* hwrm_vnic_rss_qcfg_output (size:512b/64B) */
+struct hwrm_vnic_rss_qcfg_output {
+	__le16	error_code;
+	__le16	req_type;
+	__le16	seq_id;
+	__le16	resp_len;
+	__le32	hash_type;
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_IPV4                0x1UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_TCP_IPV4            0x2UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_UDP_IPV4            0x4UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_IPV6                0x8UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_TCP_IPV6            0x10UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_UDP_IPV6            0x20UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_IPV6_FLOW_LABEL     0x40UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_AH_SPI_IPV4         0x80UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_ESP_SPI_IPV4        0x100UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_AH_SPI_IPV6         0x200UL
+	#define VNIC_RSS_QCFG_RESP_HASH_TYPE_ESP_SPI_IPV6        0x400UL
+	u8	unused_0[4];
+	__le32	hash_key[10];
+	u8	hash_mode_flags;
+	#define VNIC_RSS_QCFG_RESP_HASH_MODE_FLAGS_DEFAULT         0x1UL
+	#define VNIC_RSS_QCFG_RESP_HASH_MODE_FLAGS_INNERMOST_4     0x2UL
+	#define VNIC_RSS_QCFG_RESP_HASH_MODE_FLAGS_INNERMOST_2     0x4UL
+	#define VNIC_RSS_QCFG_RESP_HASH_MODE_FLAGS_OUTERMOST_4     0x8UL
+	#define VNIC_RSS_QCFG_RESP_HASH_MODE_FLAGS_OUTERMOST_2     0x10UL
+	u8	ring_select_mode;
+	#define VNIC_RSS_QCFG_RESP_RING_SELECT_MODE_TOEPLITZ          0x0UL
+	#define VNIC_RSS_QCFG_RESP_RING_SELECT_MODE_XOR               0x1UL
+	#define VNIC_RSS_QCFG_RESP_RING_SELECT_MODE_TOEPLITZ_CHECKSUM 0x2UL
+	#define VNIC_RSS_QCFG_RESP_RING_SELECT_MODE_LAST             VNIC_RSS_QCFG_RESP_RING_SELECT_MODE_TOEPLITZ_CHECKSUM
+	u8	unused_1[5];
+	u8	valid;
+};
+
 /* hwrm_vnic_plcmodes_cfg_input (size:320b/40B) */
 struct hwrm_vnic_plcmodes_cfg_input {
 	__le16	req_type;
-- 
2.18.1


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Re: [PATCH net-next 2/3] bnxt_en: update RSS config using difference algorithm

[Leon Romanovsky]

On Sun, Nov 06, 2022 at 07:16:31PM -0500, Michael Chan wrote:
> From: Edwin Peer <edwin.peer@broadcom.com>
> 
> Hardware is unable to realize all legal firmware interface state values
> for hash_type.  For example, if 4-tuple TCP_IPV4 hash is enabled,
> 4-tuple UDP_IPV4 hash must also be enabled.  By providing the bits the
> user intended to change instead of the possible illegal intermediate
> states, the firmware is able to make better compromises when deciding
> which bits to ignore.
> 
> With this new mechansim, we can now report the actual configured hash
> back to the user.  Add bnxt_hwrm_update_rss_hash_cfg() to report the
> actual hash after user configuration.
> 
> Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
> Signed-off-by: Michael Chan <michael.chan@broadcom.com>
> ---
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 35 +++++++++++++-
>  drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  2 +
>  .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  2 +
>  drivers/net/ethernet/broadcom/bnxt/bnxt_hsi.h | 47 +++++++++++++++++++
>  4 files changed, 85 insertions(+), 1 deletion(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>

[PATCH net-next 3/3] bnxt_en: Add a non-real time mode to access NIC clock

[Michael Chan]

[-- Attachment #1: Type: text/plain, Size: 4894 bytes --]

From: Pavan Chebbi <pavan.chebbi@broadcom.com>

When using a PHC that is shared between multiple hosts,
in order to achieve consistent timestamps across all hosts,
we need to isolate the PHC from any host making frequency
adjustments.

This patch adds a non-real time mode for this purpose.
The implementation is based on a free running NIC hardware timer
which is used as the timestamper time-base. Each host implements
individual adjustments to a local timecounter based on the NIC free
running timer.

Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     |  5 ++-
 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 45 ++++++++++++++-----
 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h |  7 ++-
 3 files changed, 42 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index d18e55b16375..d9ad325f7840 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6985,8 +6985,11 @@ static int bnxt_hwrm_func_qcfg(struct bnxt *bp)
 		if (flags & FUNC_QCFG_RESP_FLAGS_FW_DCBX_AGENT_ENABLED)
 			bp->fw_cap |= BNXT_FW_CAP_DCBX_AGENT;
 	}
-	if (BNXT_PF(bp) && (flags & FUNC_QCFG_RESP_FLAGS_MULTI_HOST))
+	if (BNXT_PF(bp) && (flags & FUNC_QCFG_RESP_FLAGS_MULTI_HOST)) {
 		bp->flags |= BNXT_FLAG_MULTI_HOST;
+		if (bp->fw_cap & BNXT_FW_CAP_PTP_RTC)
+			bp->fw_cap &= ~BNXT_FW_CAP_PTP_RTC;
+	}
 	if (flags & FUNC_QCFG_RESP_FLAGS_RING_MONITOR_ENABLED)
 		bp->fw_cap |= BNXT_FW_CAP_RING_MONITOR;
 
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
index 2132ce63193c..460cb20599f6 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
@@ -14,6 +14,7 @@
 #include <linux/net_tstamp.h>
 #include <linux/timekeeping.h>
 #include <linux/ptp_classify.h>
+#include <linux/clocksource.h>
 #include "bnxt_hsi.h"
 #include "bnxt.h"
 #include "bnxt_hwrm.h"
@@ -210,18 +211,37 @@ static int bnxt_ptp_adjfreq(struct ptp_clock_info *ptp_info, s32 ppb)
 						ptp_info);
 	struct hwrm_port_mac_cfg_input *req;
 	struct bnxt *bp = ptp->bp;
-	int rc;
+	int rc = 0;
 
-	rc = hwrm_req_init(bp, req, HWRM_PORT_MAC_CFG);
-	if (rc)
-		return rc;
+	if (!(ptp->bp->fw_cap & BNXT_FW_CAP_PTP_RTC)) {
+		int neg_adj = 0;
+		u32 diff;
+		u64 adj;
 
-	req->ptp_freq_adj_ppb = cpu_to_le32(ppb);
-	req->enables = cpu_to_le32(PORT_MAC_CFG_REQ_ENABLES_PTP_FREQ_ADJ_PPB);
-	rc = hwrm_req_send(ptp->bp, req);
-	if (rc)
-		netdev_err(ptp->bp->dev,
-			   "ptp adjfreq failed. rc = %d\n", rc);
+		if (ppb < 0) {
+			neg_adj = 1;
+			ppb = -ppb;
+		}
+		adj = ptp->cmult;
+		adj *= ppb;
+		diff = div_u64(adj, 1000000000ULL);
+
+		spin_lock_bh(&ptp->ptp_lock);
+		timecounter_read(&ptp->tc);
+		ptp->cc.mult = neg_adj ? ptp->cmult - diff : ptp->cmult + diff;
+		spin_unlock_bh(&ptp->ptp_lock);
+	} else {
+		rc = hwrm_req_init(bp, req, HWRM_PORT_MAC_CFG);
+		if (rc)
+			return rc;
+
+		req->ptp_freq_adj_ppb = cpu_to_le32(ppb);
+		req->enables = cpu_to_le32(PORT_MAC_CFG_REQ_ENABLES_PTP_FREQ_ADJ_PPB);
+		rc = hwrm_req_send(ptp->bp, req);
+		if (rc)
+			netdev_err(ptp->bp->dev,
+				   "ptp adjfreq failed. rc = %d\n", rc);
+	}
 	return rc;
 }
 
@@ -846,8 +866,9 @@ static void bnxt_ptp_timecounter_init(struct bnxt *bp, bool init_tc)
 		memset(&ptp->cc, 0, sizeof(ptp->cc));
 		ptp->cc.read = bnxt_cc_read;
 		ptp->cc.mask = CYCLECOUNTER_MASK(48);
-		ptp->cc.shift = 0;
-		ptp->cc.mult = 1;
+		ptp->cc.shift = BNXT_CYCLES_SHIFT;
+		ptp->cc.mult = clocksource_khz2mult(BNXT_DEVCLK_FREQ, ptp->cc.shift);
+		ptp->cmult = ptp->cc.mult;
 		ptp->next_overflow_check = jiffies + BNXT_PHC_OVERFLOW_PERIOD;
 	}
 	if (init_tc)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
index 4ce0a14c1e23..34162e07a119 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
@@ -17,6 +17,8 @@
 #define BNXT_PTP_GRC_WIN_BASE	0x6000
 
 #define BNXT_MAX_PHC_DRIFT	31000000
+#define BNXT_CYCLES_SHIFT	23
+#define BNXT_DEVCLK_FREQ	1000000
 #define BNXT_LO_TIMER_MASK	0x0000ffffffffUL
 #define BNXT_HI_TIMER_MASK	0xffff00000000UL
 
@@ -88,8 +90,9 @@ struct bnxt_ptp_cfg {
 	u64			old_time;
 	unsigned long		next_period;
 	unsigned long		next_overflow_check;
-	/* 48-bit PHC overflows in 78 hours.  Check overflow every 19 hours. */
-	#define BNXT_PHC_OVERFLOW_PERIOD	(19 * 3600 * HZ)
+	u32			cmult;
+	/* a 23b shift cyclecounter will overflow in ~36 mins.  Check overflow every 18 mins. */
+	#define BNXT_PHC_OVERFLOW_PERIOD	(18 * 60 * HZ)
 
 	u16			tx_seqid;
 	u16			tx_hdr_off;
-- 
2.18.1


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Re: [PATCH net-next 3/3] bnxt_en: Add a non-real time mode to access NIC clock

[Leon Romanovsky]

On Sun, Nov 06, 2022 at 07:16:32PM -0500, Michael Chan wrote:
> From: Pavan Chebbi <pavan.chebbi@broadcom.com>
> 
> When using a PHC that is shared between multiple hosts,
> in order to achieve consistent timestamps across all hosts,
> we need to isolate the PHC from any host making frequency
> adjustments.
> 
> This patch adds a non-real time mode for this purpose.
> The implementation is based on a free running NIC hardware timer
> which is used as the timestamper time-base. Each host implements
> individual adjustments to a local timecounter based on the NIC free
> running timer.
> 
> Cc: Richard Cochran <richardcochran@gmail.com>
> Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
> Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
> Signed-off-by: Michael Chan <michael.chan@broadcom.com>
> ---
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c     |  5 ++-
>  drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 45 ++++++++++++++-----
>  drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h |  7 ++-
>  3 files changed, 42 insertions(+), 15 deletions(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>

Re: [PATCH net-next 0/3] bnxt_en: Updates

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Paolo Abeni <pabeni@redhat.com>:

On Sun,  6 Nov 2022 19:16:29 -0500 you wrote:
> This small patchset adds an improvement to the configuration of ethtool
> RSS tuple hash and a PTP improvement when running in a multi-host
> environment.
> 
> Edwin Peer (2):
>   bnxt_en: refactor VNIC RSS update functions
>   bnxt_en: update RSS config using difference algorithm
> 
> [...]

Here is the summary with links:
  - [net-next,1/3] bnxt_en: refactor VNIC RSS update functions
    https://git.kernel.org/netdev/net-next/c/41d2dd42bfa1
  - [net-next,2/3] bnxt_en: update RSS config using difference algorithm
    https://git.kernel.org/netdev/net-next/c/98a4322b70e8
  - [net-next,3/3] bnxt_en: Add a non-real time mode to access NIC clock
    https://git.kernel.org/netdev/net-next/c/85036aee1938

You are awesome, thank you!
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