librdmacm/libibverbs: Add bnxtre RDMA provider to OFED build infrastructure

Extend the FreeBSD OFED build framework to include the Broadcom bnxtre RDMA
provider library.

This change:

 -Registers libbnxtre in src.libnames.mk so it is built and installed as part
  of the OFED libraries.
 -Adds bnxtre to the OFED pcap dependency set when MK_OFED is enabled.
 -Declares proper dependency mappings for bnxtre (ibverbs, pthread).
 -Introduces LIBBNXTREDIR for consistent object directory handling.
 -Updates libibverbs and librdmacm build rules to link against libbnxtre,
  enabling Broadcom RoCE device support at runtime.
 -libbnxtre library uses below constructor to register with the libibverbs,
  static attribute((constructor)) void bnxt_re_register_driver(void)

These updates ensure that applications using libibverbs and librdmacm can
discover and use Broadcom bnxt RDMA devices on FreeBSD.

Reviewed by: markj, ssaxena
Differential Revision: https://reviews.freebsd.org/D54368
MFC after: 3 days

share/mk/src.libnames.mk

@@ -283,6 +283,7 @@ _LIBRARIES+= \
 		irdma \
 		mlx4 \
 		mlx5 \
+		bnxtre \
 		rdmacm \
 		osmcomp \
 		opensm \
@@ -358,7 +359,7 @@ _DP_cap_sysctl=	nv
 _DP_cap_syslog=	nv
 _DP_crypt=	md
 .if ${MK_OFED} != "no"
-_DP_pcap=	ibverbs mlx5
+_DP_pcap=	ibverbs mlx5 bnxtre
 .endif
 _DP_pjdlog=	util
 _DP_usb=	pthread
@@ -512,6 +513,7 @@ _DP_ibverbs=
 _DP_irdma=	ibverbs pthread
 _DP_mlx4=	ibverbs pthread
 _DP_mlx5=	ibverbs pthread
+_DP_bnxtre=	ibverbs pthread
 _DP_rdmacm=	ibverbs
 _DP_osmcomp=	pthread
 _DP_opensm=	pthread
@@ -804,6 +806,7 @@ LIBIBVERBSDIR=	${_LIB_OBJTOP}/lib/ofed/libibverbs
 LIBIRDMADIR=	${_LIB_OBJTOP}/lib/ofed/libirdma
 LIBMLX4DIR=	${_LIB_OBJTOP}/lib/ofed/libmlx4
 LIBMLX5DIR=	${_LIB_OBJTOP}/lib/ofed/libmlx5
+LIBBNXTREDIR=	${_LIB_OBJTOP}/lib/ofed/libbnxtre
 LIBRDMACMDIR=	${_LIB_OBJTOP}/lib/ofed/librdmacm
 LIBOSMCOMPDIR=	${_LIB_OBJTOP}/lib/ofed/complib
 LIBOPENSMDIR=	${_LIB_OBJTOP}/lib/ofed/libopensm

usr.bin/ofed/libibverbs/Makefile.inc

@@ -3,6 +3,6 @@ _spath=${SRCTOP}/contrib/ofed/libibverbs
 
 BINDIR?=	/usr/bin
 CFLAGS+=	-I${_spath}
-LIBADD+=	ibverbs mlx4 mlx5 cxgb4 irdma pthread
+LIBADD+=	ibverbs mlx4 mlx5 bnxtre cxgb4 irdma pthread
 
 WARNS?=	2

usr.bin/ofed/librdmacm/Makefile.inc

@@ -3,6 +3,6 @@ _spath=${SRCTOP}/contrib/ofed/librdmacm
 
 BINDIR?=	/usr/bin
 CFLAGS+=	-I${SRCTOP}/contrib/ofed
-LIBADD+=	ibverbs rdmacm irdma mlx4 mlx5 cxgb4 pthread
+LIBADD+=	ibverbs rdmacm irdma mlx4 mlx5 bnxtre cxgb4 pthread
 
 WARNS?=	0