[infiniband] Include the SRP login rejection reason in the error number

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/block/srp.c

  */
 #define SRP_MAX_I_T_IU_LEN 80
 
+/* Error numbers generated by SRP login rejection */
+#define EINFO_SRP_LOGIN_REJ( reason, desc )				      \
+	__einfo_uniqify ( EINFO_EPERM, ( (reason) & 0x0f ), desc )
+#define EPERM_UNKNOWN							      \
+	__einfo_error ( EINFO_EPERM_UNKNOWN )
+#define EINFO_EPERM_UNKNOWN EINFO_SRP_LOGIN_REJ (			      \
+	SRP_LOGIN_REJ_REASON_UNKNOWN,					      \
+	"Unable to establish RDMA channel, no reason specified" )
+#define EPERM_INSUFFICIENT_RESOURCES					      \
+	__einfo_error ( EINFO_EPERM_INSUFFICIENT_RESOURCES )
+#define EINFO_EPERM_INSUFFICIENT_RESOURCES EINFO_SRP_LOGIN_REJ (	      \
+	SRP_LOGIN_REJ_REASON_INSUFFICIENT_RESOURCES,			      \
+	"Insufficient RDMA channel resources" )
+#define EPERM_BAD_MAX_I_T_IU_LEN					      \
+	__einfo_error ( EINFO_EPERM_BAD_MAX_I_T_IU_LEN )
+#define EINFO_EPERM_BAD_MAX_I_T_IU_LEN EINFO_SRP_LOGIN_REJ (		      \
+	SRP_LOGIN_REJ_REASON_BAD_MAX_I_T_IU_LEN,			      \
+	"Requested maximum initiator to target IU length value too large" )
+#define EPERM_CANNOT_ASSOCIATE						      \
+	__einfo_error ( EINFO_EPERM_CANNOT_ASSOCIATE )
+#define EINFO_EPERM_CANNOT_ASSOCIATE EINFO_SRP_LOGIN_REJ (		      \
+	SRP_LOGIN_REJ_REASON_CANNOT_ASSOCIATE,				      \
+	"Unable to associate RDMA channel with specified I_T nexus" )
+#define EPERM_UNSUPPORTED_BUFFER_FORMAT					      \
+	__einfo_error ( EINFO_EPERM_UNSUPPORTED_BUFFER_FORMAT )
+#define EINFO_EPERM_UNSUPPORTED_BUFFER_FORMAT EINFO_SRP_LOGIN_REJ (	      \
+	SRP_LOGIN_REJ_REASON_UNSUPPORTED_BUFFER_FORMAT,			      \
+	"One or more requested data buffer descriptor formats not supported" )
+#define EPERM_NO_MULTIPLE_CHANNELS					      \
+	__einfo_error ( EINFO_EPERM_NO_MULTIPLE_CHANNELS )
+#define EINFO_EPERM_NO_MULTIPLE_CHANNELS EINFO_SRP_LOGIN_REJ (		      \
+	SRP_LOGIN_REJ_REASON_NO_MULTIPLE_CHANNELS,			      \
+	"SRP target does not support multiple RDMA channels per I_T nexus" )
+#define EPERM_NO_MORE_CHANNELS						      \
+	__einfo_error ( EINFO_EPERM_NO_MORE_CHANNELS )
+#define EINFO_EPERM_NO_MORE_CHANNELS EINFO_SRP_LOGIN_REJ (		      \
+	SRP_LOGIN_REJ_REASON_NO_MORE_CHANNELS,				      \
+	"RDMA channel limit reached for this initiator" )
+#define EPERM_LOGIN_REJ( reason_nibble )				      \
+	EUNIQ ( EPERM, (reason_nibble), EPERM_UNKNOWN,			      \
+		EPERM_INSUFFICIENT_RESOURCES, EPERM_BAD_MAX_I_T_IU_LEN,	      \
+		EPERM_CANNOT_ASSOCIATE, EPERM_UNSUPPORTED_BUFFER_FORMAT,      \
+		EPERM_NO_MULTIPLE_CHANNELS, EPERM_NO_MORE_CHANNELS )
+
 /** An SRP device */
 struct srp_device {
 	/** Reference count */
 static int srp_login_rej ( struct srp_device *srpdev,
 			   const void *data, size_t len ) {
 	const struct srp_login_rej *login_rej = data;
+	uint32_t reason;
 
 	/* Sanity check */
 	if ( len < sizeof ( *login_rej ) ) {
 		       srpdev, len );
 		return -EINVAL;
 	}
-	DBGC ( srpdev, "SRP %p tag %08x LOGIN_REJ:\n",
-	       srpdev, ntohl ( login_rej->tag.dwords[1] ) );
+	reason = ntohl ( login_rej->reason );
+	DBGC ( srpdev, "SRP %p tag %08x LOGIN_REJ reason %08x:\n",
+	       srpdev, ntohl ( login_rej->tag.dwords[1] ), reason );
 	DBGC_HDA ( srpdev, 0, data, len );
 
 	/* Login rejection always indicates an error */
-	DBGC ( srpdev, "SRP %p login rejected (reason %08x)\n",
-	       srpdev, ntohl ( login_rej->reason ) );
-	return -EPERM;
+	return ( SRP_LOGIN_REJ_REASON_DEFINED ( reason ) ?
+		 -EPERM_LOGIN_REJ ( reason ) : -EACCES );
 }
 
 /**

src/include/ipxe/srp.h

 /** RDMA channel limit reached for this initiator */
 #define SRP_LOGIN_REJ_REASON_NO_MORE_CHANNELS 0x00010006UL
 
+/** SRP login rejection reason is defined */
+#define SRP_LOGIN_REJ_REASON_DEFINED( reason ) \
+	( ( (reason) & 0xfffffff0UL ) == 0x00010000UL )
+
 /** Indirect data buffer descriptor format supported */
 #define SRP_LOGIN_REJ_FMT_IDBD 0x04