RDMA/bnxt_re: Fix reporting maximum SRQs on P7 chips

Firmware reports support for additional SRQs in the max_srq_ext field.
In CREQ_QUERY_FUNC response, if MAX_SRQ_EXTENDED flag is set, driver
should derive the total number of max SRQs by the summation of
"max_srq" and "max_srq_ext" fields.

Fixes: b1b66ae ("bnxt_en: Use FW defined resource limits for RoCE")
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Preethi G <preethi.gurusiddalingeswaraswamy@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/1741021178-2569-4-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

Author: Preethi G

drivers/infiniband/hw/bnxt_re/qplib_res.h

@@ -607,4 +607,9 @@ static inline bool _is_cq_coalescing_supported(u16 dev_cap_ext_flags2)
 	return dev_cap_ext_flags2 & CREQ_QUERY_FUNC_RESP_SB_CQ_COALESCING_SUPPORTED;
 }
 
+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);
+}
+
 #endif /* __BNXT_QPLIB_RES_H__ */

drivers/infiniband/hw/bnxt_re/qplib_sp.c

@@ -176,6 +176,9 @@ int bnxt_qplib_get_dev_attr(struct bnxt_qplib_rcfw *rcfw)
 	attr->dev_cap_flags = le16_to_cpu(sb->dev_cap_flags);
 	attr->dev_cap_flags2 = le16_to_cpu(sb->dev_cap_ext_flags_2);
 
+	if (_is_max_srq_ext_supported(attr->dev_cap_flags2))
+		attr->max_srq += le16_to_cpu(sb->max_srq_ext);
+
 	bnxt_qplib_query_version(rcfw, attr->fw_ver);
 
 	for (i = 0; i < MAX_TQM_ALLOC_REQ / 4; i++) {

drivers/infiniband/hw/bnxt_re/roce_hsi.h

@@ -2215,11 +2215,12 @@ struct creq_query_func_resp_sb {
 	#define CREQ_QUERY_FUNC_RESP_SB_REQ_RETRANSMISSION_SUPPORT_IQM_MSN_TABLE   (0x2UL << 4)
 	#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_MIN_RNR_RTR_RTS_OPT_SUPPORTED            0x1000UL
 	__le16	max_xp_qp_size;
 	__le16	create_qp_batch_size;
 	__le16	destroy_qp_batch_size;
-	__le16	reserved16;
+	__le16  max_srq_ext;
 	__le64	reserved64;
 };