[PATCH rdma-rext 0/4] RDMA/bnxt_re: Add QP rate limit support

[PATCH rdma-rext 0/4] RDMA/bnxt_re: Add QP rate limit support

[Kalesh AP]

Hi,

This patchset supports QP rate limit in the bnxt_re driver.

Broadcom P7 devices supports setting the rate limit while changing
RC QP state from INIT to RTR, RTR to RTS and RTS to RTS. Or, once
the QP is transitioned to RTR or RTS state.

First patch adds stack support for rate limit for RC QPs.

Second patch adds support for QP rate limiting in the bnxt_re driver.

Third patch adds support to report packet pacing capabilities in the
query_device.

Forth patch adds support to report QP rate limit in debugfs QP info.

The pull request for rdma-core changes are at:

https://github.com/linux-rdma/rdma-core/pull/1692

Regards,
Kalesh

Kalesh AP (4):
  IB/core: Extend rate limit support for RC QPs
  RDMA/bnxt_re: Add support for QP rate limiting
  RDMA/bnxt_re: Report packet pacing capabilities when querying device
  RDMA/bnxt_re: Report QP rate limit in debugfs

 drivers/infiniband/core/verbs.c           |  9 ++++--
 drivers/infiniband/hw/bnxt_re/debugfs.c   | 14 ++++++--
 drivers/infiniband/hw/bnxt_re/ib_verbs.c  | 39 +++++++++++++++++++++--
 drivers/infiniband/hw/bnxt_re/qplib_fp.c  | 12 ++++++-
 drivers/infiniband/hw/bnxt_re/qplib_fp.h  |  3 ++
 drivers/infiniband/hw/bnxt_re/qplib_res.h |  6 ++++
 drivers/infiniband/hw/bnxt_re/qplib_sp.c  |  5 +++
 drivers/infiniband/hw/bnxt_re/qplib_sp.h  |  2 ++
 drivers/infiniband/hw/bnxt_re/roce_hsi.h  | 13 +++++---
 include/uapi/rdma/bnxt_re-abi.h           | 16 ++++++++++
 10 files changed, 107 insertions(+), 12 deletions(-)

-- 
2.43.5

[PATCH rdma-rext 1/4] IB/core: Extend rate limit support for RC QPs

[Kalesh AP]

Broadcom devices supports setting the rate limit while changing
RC QP state from INIT to RTR, RTR to RTS and RTS to RTS.

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
---
 drivers/infiniband/core/verbs.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 8b56b6b62352..02ebc3e52196 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1537,7 +1537,8 @@ static const struct {
 						 IB_QP_PKEY_INDEX),
 				 [IB_QPT_RC]  = (IB_QP_ALT_PATH			|
 						 IB_QP_ACCESS_FLAGS		|
-						 IB_QP_PKEY_INDEX),
+						 IB_QP_PKEY_INDEX		|
+						 IB_QP_RATE_LIMIT),
 				 [IB_QPT_XRC_INI] = (IB_QP_ALT_PATH		|
 						 IB_QP_ACCESS_FLAGS		|
 						 IB_QP_PKEY_INDEX),
@@ -1585,7 +1586,8 @@ static const struct {
 						 IB_QP_ALT_PATH			|
 						 IB_QP_ACCESS_FLAGS		|
 						 IB_QP_MIN_RNR_TIMER		|
-						 IB_QP_PATH_MIG_STATE),
+						 IB_QP_PATH_MIG_STATE		|
+						 IB_QP_RATE_LIMIT),
 				 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE		|
 						 IB_QP_ALT_PATH			|
 						 IB_QP_ACCESS_FLAGS		|
@@ -1619,7 +1621,8 @@ static const struct {
 						IB_QP_ACCESS_FLAGS		|
 						IB_QP_ALT_PATH			|
 						IB_QP_PATH_MIG_STATE		|
-						IB_QP_MIN_RNR_TIMER),
+						IB_QP_MIN_RNR_TIMER		|
+						IB_QP_RATE_LIMIT),
 				[IB_QPT_XRC_INI] = (IB_QP_CUR_STATE		|
 						IB_QP_ACCESS_FLAGS		|
 						IB_QP_ALT_PATH			|
-- 
2.43.5

[PATCH rdma-rext 2/4] RDMA/bnxt_re: Add support for QP rate limiting

[Kalesh AP]

Broadcom P7 chips supports applying rate limit to RC QPs.
It allows adjust shaper rate values during the INIT -> RTR,
RTR -> RTS, RTS -> RTS state changes or after QP transitions
to RTR or RTS.

Signed-off-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Reviewed-by: Hongguang Gao <hongguang.gao@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
---
 drivers/infiniband/hw/bnxt_re/ib_verbs.c  | 17 ++++++++++++++++-
 drivers/infiniband/hw/bnxt_re/qplib_fp.c  | 12 +++++++++++-
 drivers/infiniband/hw/bnxt_re/qplib_fp.h  |  3 +++
 drivers/infiniband/hw/bnxt_re/qplib_res.h |  6 ++++++
 drivers/infiniband/hw/bnxt_re/qplib_sp.c  |  5 +++++
 drivers/infiniband/hw/bnxt_re/qplib_sp.h  |  2 ++
 drivers/infiniband/hw/bnxt_re/roce_hsi.h  | 13 +++++++++----
 7 files changed, 52 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index f19b55c13d58..8be9413311b7 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -2089,7 +2089,7 @@ int bnxt_re_modify_qp(struct ib_qp *ib_qp, struct ib_qp_attr *qp_attr,
 	unsigned int flags;
 	u8 nw_type;
 
-	if (qp_attr_mask & ~IB_QP_ATTR_STANDARD_BITS)
+	if (qp_attr_mask & ~(IB_QP_ATTR_STANDARD_BITS | IB_QP_RATE_LIMIT))
 		return -EOPNOTSUPP;
 
 	qp->qplib_qp.modify_flags = 0;
@@ -2129,6 +2129,21 @@ int bnxt_re_modify_qp(struct ib_qp *ib_qp, struct ib_qp_attr *qp_attr,
 			bnxt_re_unlock_cqs(qp, flags);
 		}
 	}
+
+	if (qp_attr_mask & IB_QP_RATE_LIMIT) {
+		if (qp->qplib_qp.type == IB_QPT_RC &&
+		    _is_modify_qp_rate_limit_supported(dev_attr->dev_cap_flags2)) {
+			/* check rate limit within device limits */
+			if (qp_attr->rate_limit > dev_attr->rate_limit_max ||
+			    qp_attr->rate_limit < dev_attr->rate_limit_min) {
+				dev_err(rdev_to_dev(rdev), "Invalid rate_limit value\n");
+				return -EINVAL;
+			}
+			qp->qplib_qp.ext_modify_flags |=
+				CMDQ_MODIFY_QP_EXT_MODIFY_MASK_RATE_LIMIT_VALID;
+			qp->qplib_qp.rate_limit = qp_attr->rate_limit;
+		}
+	}
 	if (qp_attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY) {
 		qp->qplib_qp.modify_flags |=
 				CMDQ_MODIFY_QP_MODIFY_MASK_EN_SQD_ASYNC_NOTIFY;
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_fp.c b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
index c88f049136fc..3e44311bf939 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_fp.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
@@ -1313,8 +1313,8 @@ int bnxt_qplib_modify_qp(struct bnxt_qplib_res *res, struct bnxt_qplib_qp *qp)
 	struct bnxt_qplib_cmdqmsg msg = {};
 	struct cmdq_modify_qp req = {};
 	u16 vlan_pcp_vlan_dei_vlan_id;
+	u32 bmask, bmask_ext;
 	u32 temp32[4];
-	u32 bmask;
 	int rc;
 
 	bnxt_qplib_rcfw_cmd_prep((struct cmdq_base *)&req,
@@ -1329,9 +1329,16 @@ int bnxt_qplib_modify_qp(struct bnxt_qplib_res *res, struct bnxt_qplib_qp *qp)
 		    is_optimized_state_transition(qp))
 			bnxt_set_mandatory_attributes(res, qp, &req);
 	}
+
 	bmask = qp->modify_flags;
 	req.modify_mask = cpu_to_le32(qp->modify_flags);
+	bmask_ext = qp->ext_modify_flags;
+	req.ext_modify_mask = cpu_to_le32(qp->ext_modify_flags);
 	req.qp_cid = cpu_to_le32(qp->id);
+
+	if (bmask_ext & CMDQ_MODIFY_QP_EXT_MODIFY_MASK_RATE_LIMIT_VALID)
+		req.rate_limit = cpu_to_le32(qp->rate_limit);
+
 	if (bmask & CMDQ_MODIFY_QP_MODIFY_MASK_STATE) {
 		req.network_type_en_sqd_async_notify_new_state =
 				(qp->state & CMDQ_MODIFY_QP_NEW_STATE_MASK) |
@@ -1429,6 +1436,9 @@ int bnxt_qplib_modify_qp(struct bnxt_qplib_res *res, struct bnxt_qplib_qp *qp)
 	rc = bnxt_qplib_rcfw_send_message(rcfw, &msg);
 	if (rc)
 		return rc;
+
+	if (bmask_ext & CMDQ_MODIFY_QP_EXT_MODIFY_MASK_RATE_LIMIT_VALID)
+		qp->shaper_allocation_status = resp.shaper_allocation_status;
 	qp->cur_qp_state = qp->state;
 	return 0;
 }
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_fp.h b/drivers/infiniband/hw/bnxt_re/qplib_fp.h
index 1b414a73b46d..30c3f99be07b 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_fp.h
+++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.h
@@ -280,6 +280,7 @@ struct bnxt_qplib_qp {
 	u8				state;
 	u8				cur_qp_state;
 	u64				modify_flags;
+	u32				ext_modify_flags;
 	u32				max_inline_data;
 	u32				mtu;
 	u8				path_mtu;
@@ -346,6 +347,8 @@ struct bnxt_qplib_qp {
 	bool				is_host_msn_tbl;
 	u8				tos_dscp;
 	u32				ugid_index;
+	u32				rate_limit;
+	u8				shaper_allocation_status;
 };
 
 #define BNXT_RE_MAX_MSG_SIZE	0x80000000
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_res.h b/drivers/infiniband/hw/bnxt_re/qplib_res.h
index 2ea3b7f232a3..43f9c564e97c 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_res.h
+++ b/drivers/infiniband/hw/bnxt_re/qplib_res.h
@@ -623,4 +623,10 @@ static inline bool _is_max_srq_ext_supported(u16 dev_cap_ext_flags_2)
 	return !!(dev_cap_ext_flags_2 & CREQ_QUERY_FUNC_RESP_SB_MAX_SRQ_EXTENDED);
 }
 
+static inline bool _is_modify_qp_rate_limit_supported(u16 dev_cap_ext_flags2)
+{
+	return !!(dev_cap_ext_flags2 &
+		  CREQ_QUERY_FUNC_RESP_SB_MODIFY_QP_RATE_LIMIT_SUPPORTED);
+}
+
 #endif /* __BNXT_QPLIB_RES_H__ */
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_sp.c b/drivers/infiniband/hw/bnxt_re/qplib_sp.c
index 408a34df2667..ec9eb52a8ebf 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_sp.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_sp.c
@@ -193,6 +193,11 @@ int bnxt_qplib_get_dev_attr(struct bnxt_qplib_rcfw *rcfw)
 		attr->max_dpi = le32_to_cpu(sb->max_dpi);
 
 	attr->is_atomic = bnxt_qplib_is_atomic_cap(rcfw);
+
+	if (_is_modify_qp_rate_limit_supported(attr->dev_cap_flags2)) {
+		attr->rate_limit_min = le16_to_cpu(sb->rate_limit_min);
+		attr->rate_limit_max = le32_to_cpu(sb->rate_limit_max);
+	}
 bail:
 	dma_free_coherent(&rcfw->pdev->dev, sbuf.size,
 			  sbuf.sb, sbuf.dma_addr);
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_sp.h b/drivers/infiniband/hw/bnxt_re/qplib_sp.h
index 5a45c55c6464..9fadd637cb5b 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_sp.h
+++ b/drivers/infiniband/hw/bnxt_re/qplib_sp.h
@@ -76,6 +76,8 @@ struct bnxt_qplib_dev_attr {
 	u16                             dev_cap_flags;
 	u16                             dev_cap_flags2;
 	u32                             max_dpi;
+	u16				rate_limit_min;
+	u32				rate_limit_max;
 };
 
 struct bnxt_qplib_pd {
diff --git a/drivers/infiniband/hw/bnxt_re/roce_hsi.h b/drivers/infiniband/hw/bnxt_re/roce_hsi.h
index 99ecd72e72e2..aac338f2afd8 100644
--- a/drivers/infiniband/hw/bnxt_re/roce_hsi.h
+++ b/drivers/infiniband/hw/bnxt_re/roce_hsi.h
@@ -690,10 +690,11 @@ struct cmdq_modify_qp {
 	__le32	ext_modify_mask;
 	#define CMDQ_MODIFY_QP_EXT_MODIFY_MASK_EXT_STATS_CTX     0x1UL
 	#define CMDQ_MODIFY_QP_EXT_MODIFY_MASK_SCHQ_ID_VALID     0x2UL
+	#define CMDQ_MODIFY_QP_EXT_MODIFY_MASK_RATE_LIMIT_VALID  0x8UL
 	__le32	ext_stats_ctx_id;
 	__le16	schq_id;
 	__le16	unused_0;
-	__le32	reserved32;
+	__le32	rate_limit;
 };
 
 /* creq_modify_qp_resp (size:128b/16B) */
@@ -716,7 +717,8 @@ struct creq_modify_qp_resp {
 	#define CREQ_MODIFY_QP_RESP_PINGPONG_PUSH_INDEX_MASK  0xeUL
 	#define CREQ_MODIFY_QP_RESP_PINGPONG_PUSH_INDEX_SFT   1
 	#define CREQ_MODIFY_QP_RESP_PINGPONG_PUSH_STATE       0x10UL
-	u8	reserved8;
+	u8	shaper_allocation_status;
+	#define CREQ_MODIFY_QP_RESP_SHAPER_ALLOCATED          0x1UL
 	__le32	lag_src_mac;
 };
 
@@ -2179,7 +2181,7 @@ struct creq_query_func_resp {
 	u8	reserved48[6];
 };
 
-/* creq_query_func_resp_sb (size:1088b/136B) */
+/* creq_query_func_resp_sb (size:1280b/160B) */
 struct creq_query_func_resp_sb {
 	u8	opcode;
 	#define CREQ_QUERY_FUNC_RESP_SB_OPCODE_QUERY_FUNC 0x83UL
@@ -2256,12 +2258,15 @@ struct creq_query_func_resp_sb {
 	#define CREQ_QUERY_FUNC_RESP_SB_REQ_RETRANSMISSION_SUPPORT_LAST	\
 			CREQ_QUERY_FUNC_RESP_SB_REQ_RETRANSMISSION_SUPPORT_IQM_MSN_TABLE
 	#define CREQ_QUERY_FUNC_RESP_SB_MAX_SRQ_EXTENDED                         0x40UL
+	#define CREQ_QUERY_FUNC_RESP_SB_MODIFY_QP_RATE_LIMIT_SUPPORTED           0x400UL
 	#define CREQ_QUERY_FUNC_RESP_SB_MIN_RNR_RTR_RTS_OPT_SUPPORTED            0x1000UL
 	__le16	max_xp_qp_size;
 	__le16	create_qp_batch_size;
 	__le16	destroy_qp_batch_size;
 	__le16  max_srq_ext;
-	__le64	reserved64;
+	__le16	reserved16;
+	__le16  rate_limit_min;
+	__le32  rate_limit_max;
 };
 
 /* cmdq_set_func_resources (size:448b/56B) */
-- 
2.43.5

[PATCH rdma-rext 3/4] RDMA/bnxt_re: Report packet pacing capabilities when querying device

[Kalesh AP]

Enable the support to report packet pacing capabilities
from kernel to user space. Packet pacing allows to limit
the rate to any number between the maximum and minimum.

The capabilities are exposed to user space through query_device.
The following capabilities are reported:

1. The maximum and minimum rate limit in kbps.
2. Bitmap showing which QP types support rate limit.

Signed-off-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Anantha Prabhu <anantha.prabhu@broadcom.com>
---
 drivers/infiniband/hw/bnxt_re/ib_verbs.c | 22 +++++++++++++++++++++-
 include/uapi/rdma/bnxt_re-abi.h          | 16 ++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index 8be9413311b7..8e6afb72a5ab 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -186,6 +186,9 @@ int bnxt_re_query_device(struct ib_device *ibdev,
 {
 	struct bnxt_re_dev *rdev = to_bnxt_re_dev(ibdev, ibdev);
 	struct bnxt_qplib_dev_attr *dev_attr = rdev->dev_attr;
+	struct bnxt_re_query_device_ex_resp resp = {};
+	size_t outlen = (udata) ? udata->outlen : 0;
+	int rc = 0;
 
 	memset(ib_attr, 0, sizeof(*ib_attr));
 	memcpy(&ib_attr->fw_ver, dev_attr->fw_ver,
@@ -250,7 +253,21 @@ int bnxt_re_query_device(struct ib_device *ibdev,
 
 	ib_attr->max_pkeys = 1;
 	ib_attr->local_ca_ack_delay = BNXT_RE_DEFAULT_ACK_DELAY;
-	return 0;
+
+	if ((offsetofend(typeof(resp), packet_pacing_caps) <= outlen) &&
+	    _is_modify_qp_rate_limit_supported(dev_attr->dev_cap_flags2)) {
+		resp.packet_pacing_caps.qp_rate_limit_min =
+			dev_attr->rate_limit_min;
+		resp.packet_pacing_caps.qp_rate_limit_max =
+			dev_attr->rate_limit_max;
+		resp.packet_pacing_caps.supported_qpts =
+			1 << IB_QPT_RC;
+	}
+	if (outlen)
+		rc = ib_copy_to_udata(udata, &resp,
+				      min(sizeof(resp), outlen));
+
+	return rc;
 }
 
 int bnxt_re_modify_device(struct ib_device *ibdev,
@@ -4406,6 +4423,9 @@ int bnxt_re_alloc_ucontext(struct ib_ucontext *ctx, struct ib_udata *udata)
 	if (_is_host_msn_table(rdev->qplib_res.dattr->dev_cap_flags2))
 		resp.comp_mask |= BNXT_RE_UCNTX_CMASK_MSN_TABLE_ENABLED;
 
+	if (_is_modify_qp_rate_limit_supported(dev_attr->dev_cap_flags2))
+		resp.comp_mask |= BNXT_RE_UCNTX_CMASK_QP_RATE_LIMIT_ENABLED;
+
 	if (udata->inlen >= sizeof(ureq)) {
 		rc = ib_copy_from_udata(&ureq, udata, min(udata->inlen, sizeof(ureq)));
 		if (rc)
diff --git a/include/uapi/rdma/bnxt_re-abi.h b/include/uapi/rdma/bnxt_re-abi.h
index faa9d62b3b30..f24edf1c75eb 100644
--- a/include/uapi/rdma/bnxt_re-abi.h
+++ b/include/uapi/rdma/bnxt_re-abi.h
@@ -56,6 +56,7 @@ enum {
 	BNXT_RE_UCNTX_CMASK_DBR_PACING_ENABLED = 0x08ULL,
 	BNXT_RE_UCNTX_CMASK_POW2_DISABLED = 0x10ULL,
 	BNXT_RE_UCNTX_CMASK_MSN_TABLE_ENABLED = 0x40,
+	BNXT_RE_UCNTX_CMASK_QP_RATE_LIMIT_ENABLED = 0x80ULL,
 };
 
 enum bnxt_re_wqe_mode {
@@ -215,4 +216,19 @@ enum bnxt_re_toggle_mem_methods {
 	BNXT_RE_METHOD_GET_TOGGLE_MEM = (1U << UVERBS_ID_NS_SHIFT),
 	BNXT_RE_METHOD_RELEASE_TOGGLE_MEM,
 };
+
+struct bnxt_re_packet_pacing_caps {
+	__u32 qp_rate_limit_min;
+	__u32 qp_rate_limit_max; /* In kbps */
+	/* Corresponding bit will be set if qp type from
+	 * 'enum ib_qp_type' is supported, e.g.
+	 * supported_qpts |= 1 << IB_QPT_RC
+	 */
+	__u32 supported_qpts;
+	__u32 reserved;
+};
+
+struct bnxt_re_query_device_ex_resp {
+	struct bnxt_re_packet_pacing_caps packet_pacing_caps;
+};
 #endif /* __BNXT_RE_UVERBS_ABI_H__*/
-- 
2.43.5

[PATCH rdma-rext 4/4] RDMA/bnxt_re: Report QP rate limit in debugfs

[Kalesh AP]

Update QP info debugfs hook to report the rate limit applied
on the QP. 0 means unlimited.

Signed-off-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
---
 drivers/infiniband/hw/bnxt_re/debugfs.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/bnxt_re/debugfs.c b/drivers/infiniband/hw/bnxt_re/debugfs.c
index 88817c86ae24..e025217861c2 100644
--- a/drivers/infiniband/hw/bnxt_re/debugfs.c
+++ b/drivers/infiniband/hw/bnxt_re/debugfs.c
@@ -87,25 +87,35 @@ static ssize_t qp_info_read(struct file *filep,
 			    size_t count, loff_t *ppos)
 {
 	struct bnxt_re_qp *qp = filep->private_data;
+	struct bnxt_qplib_qp *qplib_qp;
+	u32 rate_limit = 0;
 	char *buf;
 	int len;
 
 	if (*ppos)
 		return 0;
 
+	qplib_qp = &qp->qplib_qp;
+	if (qplib_qp->shaper_allocation_status)
+		rate_limit = qplib_qp->rate_limit;
+
 	buf = kasprintf(GFP_KERNEL,
 			"QPN\t\t: %d\n"
 			"transport\t: %s\n"
 			"state\t\t: %s\n"
 			"mtu\t\t: %d\n"
 			"timeout\t\t: %d\n"
-			"remote QPN\t: %d\n",
+			"remote QPN\t: %d\n"
+			"shaper allocated : %d\n"
+			"rate limit\t: %d kbps\n",
 			qp->qplib_qp.id,
 			bnxt_re_qp_type_str(qp->qplib_qp.type),
 			bnxt_re_qp_state_str(qp->qplib_qp.state),
 			qp->qplib_qp.mtu,
 			qp->qplib_qp.timeout,
-			qp->qplib_qp.dest_qpn);
+			qp->qplib_qp.dest_qpn,
+			qplib_qp->shaper_allocation_status,
+			rate_limit);
 	if (!buf)
 		return -ENOMEM;
 	if (count < strlen(buf)) {
-- 
2.43.5

Re: [PATCH rdma-rext 0/4] RDMA/bnxt_re: Add QP rate limit support

[Kalesh Anakkur Purayil]

[-- Attachment #1: Type: text/plain, Size: 1834 bytes --]

Hi Leon, Jason,

A gentle reminder. Could you please review the patch series?

On Fri, Jan 16, 2026 at 2:43 PM Kalesh AP
<kalesh-anakkur.purayil@broadcom.com> wrote:
>
> Hi,
>
> This patchset supports QP rate limit in the bnxt_re driver.
>
> Broadcom P7 devices supports setting the rate limit while changing
> RC QP state from INIT to RTR, RTR to RTS and RTS to RTS. Or, once
> the QP is transitioned to RTR or RTS state.
>
> First patch adds stack support for rate limit for RC QPs.
>
> Second patch adds support for QP rate limiting in the bnxt_re driver.
>
> Third patch adds support to report packet pacing capabilities in the
> query_device.
>
> Forth patch adds support to report QP rate limit in debugfs QP info.
>
> The pull request for rdma-core changes are at:
>
> https://github.com/linux-rdma/rdma-core/pull/1692
>
> Regards,
> Kalesh
>
> Kalesh AP (4):
>   IB/core: Extend rate limit support for RC QPs
>   RDMA/bnxt_re: Add support for QP rate limiting
>   RDMA/bnxt_re: Report packet pacing capabilities when querying device
>   RDMA/bnxt_re: Report QP rate limit in debugfs
>
>  drivers/infiniband/core/verbs.c           |  9 ++++--
>  drivers/infiniband/hw/bnxt_re/debugfs.c   | 14 ++++++--
>  drivers/infiniband/hw/bnxt_re/ib_verbs.c  | 39 +++++++++++++++++++++--
>  drivers/infiniband/hw/bnxt_re/qplib_fp.c  | 12 ++++++-
>  drivers/infiniband/hw/bnxt_re/qplib_fp.h  |  3 ++
>  drivers/infiniband/hw/bnxt_re/qplib_res.h |  6 ++++
>  drivers/infiniband/hw/bnxt_re/qplib_sp.c  |  5 +++
>  drivers/infiniband/hw/bnxt_re/qplib_sp.h  |  2 ++
>  drivers/infiniband/hw/bnxt_re/roce_hsi.h  | 13 +++++---
>  include/uapi/rdma/bnxt_re-abi.h           | 16 ++++++++++
>  10 files changed, 107 insertions(+), 12 deletions(-)
>
> --
> 2.43.5
>


-- 
Regards,
Kalesh AP

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Re: [PATCH rdma-rext 0/4] RDMA/bnxt_re: Add QP rate limit support

[Leon Romanovsky]

On Sun, Jan 25, 2026 at 09:47:05AM +0530, Kalesh Anakkur Purayil wrote:
> Hi Leon, Jason,
> 
> A gentle reminder. Could you please review the patch series?

Sorry for the delayed response. The idea and implementation look fine to me.
What is missing is a clear and well-documented definition of the semantics
of QP rate limiting for RC QPs.

How should RDMA_READ or small RDMA_REQ packets be treated? Are response
packets included in the rate limit as well? It must be documented in
man pages.

Thanks

> 
> On Fri, Jan 16, 2026 at 2:43 PM Kalesh AP
> <kalesh-anakkur.purayil@broadcom.com> wrote:
> >
> > Hi,
> >
> > This patchset supports QP rate limit in the bnxt_re driver.
> >
> > Broadcom P7 devices supports setting the rate limit while changing
> > RC QP state from INIT to RTR, RTR to RTS and RTS to RTS. Or, once
> > the QP is transitioned to RTR or RTS state.
> >
> > First patch adds stack support for rate limit for RC QPs.
> >
> > Second patch adds support for QP rate limiting in the bnxt_re driver.
> >
> > Third patch adds support to report packet pacing capabilities in the
> > query_device.
> >
> > Forth patch adds support to report QP rate limit in debugfs QP info.
> >
> > The pull request for rdma-core changes are at:
> >
> > https://github.com/linux-rdma/rdma-core/pull/1692
> >
> > Regards,
> > Kalesh
> >
> > Kalesh AP (4):
> >   IB/core: Extend rate limit support for RC QPs
> >   RDMA/bnxt_re: Add support for QP rate limiting
> >   RDMA/bnxt_re: Report packet pacing capabilities when querying device
> >   RDMA/bnxt_re: Report QP rate limit in debugfs
> >
> >  drivers/infiniband/core/verbs.c           |  9 ++++--
> >  drivers/infiniband/hw/bnxt_re/debugfs.c   | 14 ++++++--
> >  drivers/infiniband/hw/bnxt_re/ib_verbs.c  | 39 +++++++++++++++++++++--
> >  drivers/infiniband/hw/bnxt_re/qplib_fp.c  | 12 ++++++-
> >  drivers/infiniband/hw/bnxt_re/qplib_fp.h  |  3 ++
> >  drivers/infiniband/hw/bnxt_re/qplib_res.h |  6 ++++
> >  drivers/infiniband/hw/bnxt_re/qplib_sp.c  |  5 +++
> >  drivers/infiniband/hw/bnxt_re/qplib_sp.h  |  2 ++
> >  drivers/infiniband/hw/bnxt_re/roce_hsi.h  | 13 +++++---
> >  include/uapi/rdma/bnxt_re-abi.h           | 16 ++++++++++
> >  10 files changed, 107 insertions(+), 12 deletions(-)
> >
> > --
> > 2.43.5
> >
> 
> 
> -- 
> Regards,
> Kalesh AP

Re: [PATCH rdma-rext 0/4] RDMA/bnxt_re: Add QP rate limit support

[Selvin Xavier]

[-- Attachment #1: Type: text/plain, Size: 3790 bytes --]

On Tue, Jan 27, 2026 at 1:49 AM Leon Romanovsky <leon@kernel.org> wrote:
>
> On Sun, Jan 25, 2026 at 09:47:05AM +0530, Kalesh Anakkur Purayil wrote:
> > Hi Leon, Jason,
> >
> > A gentle reminder. Could you please review the patch series?
>
> Sorry for the delayed response. The idea and implementation look fine to me.
Thanks you for your response.
> What is missing is a clear and well-documented definition of the semantics
> of QP rate limiting for RC QPs.

man page of ibv_modify_qp doesn't have much information about rate limit

 struct ibv_qp_attr {
...
          uint32_t                rate_limit;             /* Rate
limit in kbps for packet pacing */
       };


attr_mask:IBV_QP_RATE_LIMIT  Set rate_limit

This man page contains only the required field for each transition and
doesn't mention about the optional flags. Do you want us to add a
section for the QP rate limit in the notes?

>
> How should RDMA_READ or small RDMA_REQ packets be treated? Are response
> packets included in the rate limit as well? It must be documented in
> man pages.

All transmitted packets (including rdma_read request and other request
packets) will be part of rate limiting setting for the QP. In our
implementation, the ack packets are not part of the rate limiting of
the normal transmit path. READ data response will be rate limited at
the peer side, if the rate limit is configured on the peer side.

We have another question. Existing implementation of IB_QP_RATE_LIMIT
is applicable only for raw ethernet QP. With this change, we will
start supporting for RC QPs also. So mlx driver can also get this
request for RC QPs, but it will silently ignored as the QP type is not
Raw ethernet QP. Should we fail the request instead?

Thanks,
Selvin Xavier
>
> Thanks
>
> >
> > On Fri, Jan 16, 2026 at 2:43 PM Kalesh AP
> > <kalesh-anakkur.purayil@broadcom.com> wrote:
> > >
> > > Hi,
> > >
> > > This patchset supports QP rate limit in the bnxt_re driver.
> > >
> > > Broadcom P7 devices supports setting the rate limit while changing
> > > RC QP state from INIT to RTR, RTR to RTS and RTS to RTS. Or, once
> > > the QP is transitioned to RTR or RTS state.
> > >
> > > First patch adds stack support for rate limit for RC QPs.
> > >
> > > Second patch adds support for QP rate limiting in the bnxt_re driver.
> > >
> > > Third patch adds support to report packet pacing capabilities in the
> > > query_device.
> > >
> > > Forth patch adds support to report QP rate limit in debugfs QP info.
> > >
> > > The pull request for rdma-core changes are at:
> > >
> > > https://github.com/linux-rdma/rdma-core/pull/1692
> > >
> > > Regards,
> > > Kalesh
> > >
> > > Kalesh AP (4):
> > >   IB/core: Extend rate limit support for RC QPs
> > >   RDMA/bnxt_re: Add support for QP rate limiting
> > >   RDMA/bnxt_re: Report packet pacing capabilities when querying device
> > >   RDMA/bnxt_re: Report QP rate limit in debugfs
> > >
> > >  drivers/infiniband/core/verbs.c           |  9 ++++--
> > >  drivers/infiniband/hw/bnxt_re/debugfs.c   | 14 ++++++--
> > >  drivers/infiniband/hw/bnxt_re/ib_verbs.c  | 39 +++++++++++++++++++++--
> > >  drivers/infiniband/hw/bnxt_re/qplib_fp.c  | 12 ++++++-
> > >  drivers/infiniband/hw/bnxt_re/qplib_fp.h  |  3 ++
> > >  drivers/infiniband/hw/bnxt_re/qplib_res.h |  6 ++++
> > >  drivers/infiniband/hw/bnxt_re/qplib_sp.c  |  5 +++
> > >  drivers/infiniband/hw/bnxt_re/qplib_sp.h  |  2 ++
> > >  drivers/infiniband/hw/bnxt_re/roce_hsi.h  | 13 +++++---
> > >  include/uapi/rdma/bnxt_re-abi.h           | 16 ++++++++++
> > >  10 files changed, 107 insertions(+), 12 deletions(-)
> > >
> > > --
> > > 2.43.5
> > >
> >
> >
> > --
> > Regards,
> > Kalesh AP
>
>
>

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Re: [PATCH rdma-rext 0/4] RDMA/bnxt_re: Add QP rate limit support

[Leon Romanovsky]

On Wed, Jan 28, 2026 at 12:33:57PM +0530, Selvin Xavier wrote:
> On Tue, Jan 27, 2026 at 1:49 AM Leon Romanovsky <leon@kernel.org> wrote:
> >
> > On Sun, Jan 25, 2026 at 09:47:05AM +0530, Kalesh Anakkur Purayil wrote:
> > > Hi Leon, Jason,
> > >
> > > A gentle reminder. Could you please review the patch series?
> >
> > Sorry for the delayed response. The idea and implementation look fine to me.
> Thanks you for your response.
> > What is missing is a clear and well-documented definition of the semantics
> > of QP rate limiting for RC QPs.
> 
> man page of ibv_modify_qp doesn't have much information about rate limit
> 
>  struct ibv_qp_attr {
> ...
>           uint32_t                rate_limit;             /* Rate
> limit in kbps for packet pacing */
>        };
> 
> 
> attr_mask:IBV_QP_RATE_LIMIT  Set rate_limit
> 
> This man page contains only the required field for each transition and
> doesn't mention about the optional flags. Do you want us to add a
> section for the QP rate limit in the notes?

I would expect the changes to be in https://github.com/linux-rdma/rdma-core/blob/master/libibverbs/man/ibv_modify_qp_rate_limit.3
and your driver implements .modify_qp_rate_limit() callback in rdma-core.

> 
> >
> > How should RDMA_READ or small RDMA_REQ packets be treated? Are response
> > packets included in the rate limit as well? It must be documented in
> > man pages.
> 
> All transmitted packets (including rdma_read request and other request
> packets) will be part of rate limiting setting for the QP. In our
> implementation, the ack packets are not part of the rate limiting of
> the normal transmit path. READ data response will be rate limited at
> the peer side, if the rate limit is configured on the peer side.
> 
> We have another question. Existing implementation of IB_QP_RATE_LIMIT
> is applicable only for raw ethernet QP. With this change, we will
> start supporting for RC QPs also. So mlx driver can also get this
> request for RC QPs, but it will silently ignored as the QP type is not
> Raw ethernet QP. Should we fail the request instead?

We should return something to users, since it would be surprising if a
policy-related feature simply failed without notice.

The tricky part is deciding how to expose this so users can anticipate it
up front, especially since we're dealing with a generic verb.

Thanks

> 
> Thanks,
> Selvin Xavier
> >
> > Thanks
> >
> > >
> > > On Fri, Jan 16, 2026 at 2:43 PM Kalesh AP
> > > <kalesh-anakkur.purayil@broadcom.com> wrote:
> > > >
> > > > Hi,
> > > >
> > > > This patchset supports QP rate limit in the bnxt_re driver.
> > > >
> > > > Broadcom P7 devices supports setting the rate limit while changing
> > > > RC QP state from INIT to RTR, RTR to RTS and RTS to RTS. Or, once
> > > > the QP is transitioned to RTR or RTS state.
> > > >
> > > > First patch adds stack support for rate limit for RC QPs.
> > > >
> > > > Second patch adds support for QP rate limiting in the bnxt_re driver.
> > > >
> > > > Third patch adds support to report packet pacing capabilities in the
> > > > query_device.
> > > >
> > > > Forth patch adds support to report QP rate limit in debugfs QP info.
> > > >
> > > > The pull request for rdma-core changes are at:
> > > >
> > > > https://github.com/linux-rdma/rdma-core/pull/1692
> > > >
> > > > Regards,
> > > > Kalesh
> > > >
> > > > Kalesh AP (4):
> > > >   IB/core: Extend rate limit support for RC QPs
> > > >   RDMA/bnxt_re: Add support for QP rate limiting
> > > >   RDMA/bnxt_re: Report packet pacing capabilities when querying device
> > > >   RDMA/bnxt_re: Report QP rate limit in debugfs
> > > >
> > > >  drivers/infiniband/core/verbs.c           |  9 ++++--
> > > >  drivers/infiniband/hw/bnxt_re/debugfs.c   | 14 ++++++--
> > > >  drivers/infiniband/hw/bnxt_re/ib_verbs.c  | 39 +++++++++++++++++++++--
> > > >  drivers/infiniband/hw/bnxt_re/qplib_fp.c  | 12 ++++++-
> > > >  drivers/infiniband/hw/bnxt_re/qplib_fp.h  |  3 ++
> > > >  drivers/infiniband/hw/bnxt_re/qplib_res.h |  6 ++++
> > > >  drivers/infiniband/hw/bnxt_re/qplib_sp.c  |  5 +++
> > > >  drivers/infiniband/hw/bnxt_re/qplib_sp.h  |  2 ++
> > > >  drivers/infiniband/hw/bnxt_re/roce_hsi.h  | 13 +++++---
> > > >  include/uapi/rdma/bnxt_re-abi.h           | 16 ++++++++++
> > > >  10 files changed, 107 insertions(+), 12 deletions(-)
> > > >
> > > > --
> > > > 2.43.5
> > > >
> > >
> > >
> > > --
> > > Regards,
> > > Kalesh AP
> >
> >
> >

Re: [PATCH rdma-rext 0/4] RDMA/bnxt_re: Add QP rate limit support

[Jason Gunthorpe]

On Wed, Jan 28, 2026 at 12:33:57PM +0530, Selvin Xavier wrote:

> We have another question. Existing implementation of IB_QP_RATE_LIMIT
> is applicable only for raw ethernet QP. With this change, we will
> start supporting for RC QPs also. So mlx driver can also get this
> request for RC QPs, but it will silently ignored as the QP type is not
> Raw ethernet QP. Should we fail the request instead?

Yes it should fail, I think that is an existing mlx5 bug

Jason

Re: [PATCH rdma-rext 0/4] RDMA/bnxt_re: Add QP rate limit support

[Selvin Xavier]

[-- Attachment #1: Type: text/plain, Size: 890 bytes --]

On Thu, Jan 29, 2026 at 6:10 AM Jason Gunthorpe <jgg@ziepe.ca> wrote:
>
> On Wed, Jan 28, 2026 at 12:33:57PM +0530, Selvin Xavier wrote:
>
> > We have another question. Existing implementation of IB_QP_RATE_LIMIT
> > is applicable only for raw ethernet QP. With this change, we will
> > start supporting for RC QPs also. So mlx driver can also get this
> > request for RC QPs, but it will silently ignored as the QP type is not
> > Raw ethernet QP. Should we fail the request instead?
>
> Yes it should fail, I think that is an existing mlx5 bug
For mlx5, ib_modify_qp_is_ok would previously fail if rate limiting
was attempted on any QP other than raw Ethernet QPs.
With support now being extended to RC QPs, the ib_modify_qp_is_ok
check will pass for RC QPs also, and hence mlx5 requires an explicit
failure now.
We will add this check also in this series.
>
> Jason

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Re: [PATCH rdma-rext 0/4] RDMA/bnxt_re: Add QP rate limit support

[Selvin Xavier]

[-- Attachment #1: Type: text/plain, Size: 5019 bytes --]

On Wed, Jan 28, 2026 at 5:47 PM Leon Romanovsky <leon@kernel.org> wrote:
>
> On Wed, Jan 28, 2026 at 12:33:57PM +0530, Selvin Xavier wrote:
> > On Tue, Jan 27, 2026 at 1:49 AM Leon Romanovsky <leon@kernel.org> wrote:
> > >
> > > On Sun, Jan 25, 2026 at 09:47:05AM +0530, Kalesh Anakkur Purayil wrote:
> > > > Hi Leon, Jason,
> > > >
> > > > A gentle reminder. Could you please review the patch series?
> > >
> > > Sorry for the delayed response. The idea and implementation look fine to me.
> > Thanks you for your response.
> > > What is missing is a clear and well-documented definition of the semantics
> > > of QP rate limiting for RC QPs.
> >
> > man page of ibv_modify_qp doesn't have much information about rate limit
> >
> >  struct ibv_qp_attr {
> > ...
> >           uint32_t                rate_limit;             /* Rate
> > limit in kbps for packet pacing */
> >        };
> >
> >
> > attr_mask:IBV_QP_RATE_LIMIT  Set rate_limit
> >
> > This man page contains only the required field for each transition and
> > doesn't mention about the optional flags. Do you want us to add a
> > section for the QP rate limit in the notes?
>
> I would expect the changes to be in https://github.com/linux-rdma/rdma-core/blob/master/libibverbs/man/ibv_modify_qp_rate_limit.3
will update this with the QP types supported.
> and your driver implements .modify_qp_rate_limit() callback in rdma-core.
This is already done in this pull request -
https://github.com/linux-rdma/rdma-core/pull/1692

Thanks
>
> >
> > >
> > > How should RDMA_READ or small RDMA_REQ packets be treated? Are response
> > > packets included in the rate limit as well? It must be documented in
> > > man pages.
> >
> > All transmitted packets (including rdma_read request and other request
> > packets) will be part of rate limiting setting for the QP. In our
> > implementation, the ack packets are not part of the rate limiting of
> > the normal transmit path. READ data response will be rate limited at
> > the peer side, if the rate limit is configured on the peer side.
> >
> > We have another question. Existing implementation of IB_QP_RATE_LIMIT
> > is applicable only for raw ethernet QP. With this change, we will
> > start supporting for RC QPs also. So mlx driver can also get this
> > request for RC QPs, but it will silently ignored as the QP type is not
> > Raw ethernet QP. Should we fail the request instead?
>
> We should return something to users, since it would be surprising if a
> policy-related feature simply failed without notice.
>
> The tricky part is deciding how to expose this so users can anticipate it
> up front, especially since we're dealing with a generic verb.
>
> Thanks
>
> >
> > Thanks,
> > Selvin Xavier
> > >
> > > Thanks
> > >
> > > >
> > > > On Fri, Jan 16, 2026 at 2:43 PM Kalesh AP
> > > > <kalesh-anakkur.purayil@broadcom.com> wrote:
> > > > >
> > > > > Hi,
> > > > >
> > > > > This patchset supports QP rate limit in the bnxt_re driver.
> > > > >
> > > > > Broadcom P7 devices supports setting the rate limit while changing
> > > > > RC QP state from INIT to RTR, RTR to RTS and RTS to RTS. Or, once
> > > > > the QP is transitioned to RTR or RTS state.
> > > > >
> > > > > First patch adds stack support for rate limit for RC QPs.
> > > > >
> > > > > Second patch adds support for QP rate limiting in the bnxt_re driver.
> > > > >
> > > > > Third patch adds support to report packet pacing capabilities in the
> > > > > query_device.
> > > > >
> > > > > Forth patch adds support to report QP rate limit in debugfs QP info.
> > > > >
> > > > > The pull request for rdma-core changes are at:
> > > > >
> > > > > https://github.com/linux-rdma/rdma-core/pull/1692
> > > > >
> > > > > Regards,
> > > > > Kalesh
> > > > >
> > > > > Kalesh AP (4):
> > > > >   IB/core: Extend rate limit support for RC QPs
> > > > >   RDMA/bnxt_re: Add support for QP rate limiting
> > > > >   RDMA/bnxt_re: Report packet pacing capabilities when querying device
> > > > >   RDMA/bnxt_re: Report QP rate limit in debugfs
> > > > >
> > > > >  drivers/infiniband/core/verbs.c           |  9 ++++--
> > > > >  drivers/infiniband/hw/bnxt_re/debugfs.c   | 14 ++++++--
> > > > >  drivers/infiniband/hw/bnxt_re/ib_verbs.c  | 39 +++++++++++++++++++++--
> > > > >  drivers/infiniband/hw/bnxt_re/qplib_fp.c  | 12 ++++++-
> > > > >  drivers/infiniband/hw/bnxt_re/qplib_fp.h  |  3 ++
> > > > >  drivers/infiniband/hw/bnxt_re/qplib_res.h |  6 ++++
> > > > >  drivers/infiniband/hw/bnxt_re/qplib_sp.c  |  5 +++
> > > > >  drivers/infiniband/hw/bnxt_re/qplib_sp.h  |  2 ++
> > > > >  drivers/infiniband/hw/bnxt_re/roce_hsi.h  | 13 +++++---
> > > > >  include/uapi/rdma/bnxt_re-abi.h           | 16 ++++++++++
> > > > >  10 files changed, 107 insertions(+), 12 deletions(-)
> > > > >
> > > > > --
> > > > > 2.43.5
> > > > >
> > > >
> > > >
> > > > --
> > > > Regards,
> > > > Kalesh AP
> > >
> > >
> > >
>
>

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