net: Getting rid of the x86 dependency to built vmxnet3

This patch removes config dependency on x86 to build vmxnet3 driver. Thus
the driver can be built on big endian architectures now. Although vmxnet3
is not supported on VMs other than x86 architecture, all this code goes in
to ensure correctness. If the code is not dependent on x86, it should not
assume little endian architecture in any of its operations.
Signed-off-by: NShreyas Bhatewara <sbhatewara@vmware.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/Kconfig

@@ -3235,7 +3235,7 @@ config VIRTIO_NET
 
 config VMXNET3
        tristate "VMware VMXNET3 ethernet driver"
-       depends on PCI && X86 && INET
+       depends on PCI && INET
        help
          This driver supports VMware's vmxnet3 virtual ethernet NIC.
          To compile this driver as a module, choose M here: the

drivers/net/vmxnet3/vmxnet3_defs.h

@@ -90,16 +90,52 @@ enum {
 	VMXNET3_CMD_GET_CONF_INTR
 };
 
+/*
+ *	Little Endian layout of bitfields -
+ *	Byte 0 :	7.....len.....0
+ *	Byte 1 :	rsvd gen 13.len.8
+ *	Byte 2 : 	5.msscof.0 ext1  dtype
+ *	Byte 3 : 	13...msscof...6
+ *
+ *	Big Endian layout of bitfields -
+ *	Byte 0:		13...msscof...6
+ *	Byte 1 : 	5.msscof.0 ext1  dtype
+ *	Byte 2 :	rsvd gen 13.len.8
+ *	Byte 3 :	7.....len.....0
+ *
+ *	Thus, le32_to_cpu on the dword will allow the big endian driver to read
+ *	the bit fields correctly. And cpu_to_le32 will convert bitfields
+ *	bit fields written by big endian driver to format required by device.
+ */
+
 struct Vmxnet3_TxDesc {
-	u64		addr;
+	__le64 addr;
 
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32 msscof:14;  /* MSS, checksum offset, flags */
+	u32 ext1:1;
+	u32 dtype:1;    /* descriptor type */
+	u32 rsvd:1;
+	u32 gen:1;      /* generation bit */
+	u32 len:14;
+#else
 	u32 len:14;
 	u32 gen:1;      /* generation bit */
 	u32 rsvd:1;
 	u32 dtype:1;    /* descriptor type */
 	u32 ext1:1;
 	u32 msscof:14;  /* MSS, checksum offset, flags */
+#endif  /* __BIG_ENDIAN_BITFIELD */
 
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32 tci:16;     /* Tag to Insert */
+	u32 ti:1;       /* VLAN Tag Insertion */
+	u32 ext2:1;
+	u32 cq:1;       /* completion request */
+	u32 eop:1;      /* End Of Packet */
+	u32 om:2;       /* offload mode */
+	u32 hlen:10;    /* header len */
+#else
 	u32 hlen:10;    /* header len */
 	u32 om:2;       /* offload mode */
 	u32 eop:1;      /* End Of Packet */
@@ -107,6 +143,7 @@ struct Vmxnet3_TxDesc {
 	u32 ext2:1;
 	u32 ti:1;       /* VLAN Tag Insertion */
 	u32 tci:16;     /* Tag to Insert */
+#endif  /* __BIG_ENDIAN_BITFIELD */
 };
 
 /* TxDesc.OM values */
@@ -118,6 +155,8 @@ struct Vmxnet3_TxDesc {
 #define VMXNET3_TXD_EOP_SHIFT	12
 #define VMXNET3_TXD_CQ_SHIFT	13
 #define VMXNET3_TXD_GEN_SHIFT	14
+#define VMXNET3_TXD_EOP_DWORD_SHIFT 3
+#define VMXNET3_TXD_GEN_DWORD_SHIFT 2
 
 #define VMXNET3_TXD_CQ		(1 << VMXNET3_TXD_CQ_SHIFT)
 #define VMXNET3_TXD_EOP		(1 << VMXNET3_TXD_EOP_SHIFT)
@@ -130,29 +169,40 @@ struct Vmxnet3_TxDataDesc {
 	u8		data[VMXNET3_HDR_COPY_SIZE];
 };
 
+#define VMXNET3_TCD_GEN_SHIFT	31
+#define VMXNET3_TCD_GEN_SIZE	1
+#define VMXNET3_TCD_TXIDX_SHIFT	0
+#define VMXNET3_TCD_TXIDX_SIZE	12
+#define VMXNET3_TCD_GEN_DWORD_SHIFT	3
 
 struct Vmxnet3_TxCompDesc {
 	u32		txdIdx:12;    /* Index of the EOP TxDesc */
 	u32		ext1:20;
 
-	u32		ext2;
-	u32		ext3;
+	__le32		ext2;
+	__le32		ext3;
 
 	u32		rsvd:24;
 	u32		type:7;       /* completion type */
 	u32		gen:1;        /* generation bit */
 };
 
-
 struct Vmxnet3_RxDesc {
-	u64		addr;
+	__le64		addr;
 
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32		gen:1;        /* Generation bit */
+	u32		rsvd:15;
+	u32		dtype:1;      /* Descriptor type */
+	u32		btype:1;      /* Buffer Type */
+	u32		len:14;
+#else
 	u32		len:14;
 	u32		btype:1;      /* Buffer Type */
 	u32		dtype:1;      /* Descriptor type */
 	u32		rsvd:15;
 	u32		gen:1;        /* Generation bit */
-
+#endif
 	u32		ext1;
 };
 
@@ -164,8 +214,17 @@ struct Vmxnet3_RxDesc {
 #define VMXNET3_RXD_BTYPE_SHIFT  14
 #define VMXNET3_RXD_GEN_SHIFT    31
 
-
 struct Vmxnet3_RxCompDesc {
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32		ext2:1;
+	u32		cnc:1;        /* Checksum Not Calculated */
+	u32		rssType:4;    /* RSS hash type used */
+	u32		rqID:10;      /* rx queue/ring ID */
+	u32		sop:1;        /* Start of Packet */
+	u32		eop:1;        /* End of Packet */
+	u32		ext1:2;
+	u32		rxdIdx:12;    /* Index of the RxDesc */
+#else
 	u32		rxdIdx:12;    /* Index of the RxDesc */
 	u32		ext1:2;
 	u32		eop:1;        /* End of Packet */
@@ -174,14 +233,36 @@ struct Vmxnet3_RxCompDesc {
 	u32		rssType:4;    /* RSS hash type used */
 	u32		cnc:1;        /* Checksum Not Calculated */
 	u32		ext2:1;
+#endif  /* __BIG_ENDIAN_BITFIELD */
 
-	u32		rssHash;      /* RSS hash value */
+	__le32		rssHash;      /* RSS hash value */
 
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32		tci:16;       /* Tag stripped */
+	u32		ts:1;         /* Tag is stripped */
+	u32		err:1;        /* Error */
+	u32		len:14;       /* data length */
+#else
 	u32		len:14;       /* data length */
 	u32		err:1;        /* Error */
 	u32		ts:1;         /* Tag is stripped */
 	u32		tci:16;       /* Tag stripped */
+#endif  /* __BIG_ENDIAN_BITFIELD */
+
 
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32		gen:1;        /* generation bit */
+	u32		type:7;       /* completion type */
+	u32		fcs:1;        /* Frame CRC correct */
+	u32		frg:1;        /* IP Fragment */
+	u32		v4:1;         /* IPv4 */
+	u32		v6:1;         /* IPv6 */
+	u32		ipc:1;        /* IP Checksum Correct */
+	u32		tcp:1;        /* TCP packet */
+	u32		udp:1;        /* UDP packet */
+	u32		tuc:1;        /* TCP/UDP Checksum Correct */
+	u32		csum:16;
+#else
 	u32		csum:16;
 	u32		tuc:1;        /* TCP/UDP Checksum Correct */
 	u32		udp:1;        /* UDP packet */
@@ -193,6 +274,7 @@ struct Vmxnet3_RxCompDesc {
 	u32		fcs:1;        /* Frame CRC correct */
 	u32		type:7;       /* completion type */
 	u32		gen:1;        /* generation bit */
+#endif  /* __BIG_ENDIAN_BITFIELD */
 };
 
 /* fields in RxCompDesc we access via Vmxnet3_GenericDesc.dword[3] */
@@ -206,6 +288,8 @@ struct Vmxnet3_RxCompDesc {
 /* csum OK for TCP/UDP pkts over IP */
 #define VMXNET3_RCD_CSUM_OK (1 << VMXNET3_RCD_TUC_SHIFT | \
 			     1 << VMXNET3_RCD_IPC_SHIFT)
+#define VMXNET3_TXD_GEN_SIZE 1
+#define VMXNET3_TXD_EOP_SIZE 1
 
 /* value of RxCompDesc.rssType */
 enum {
@@ -219,9 +303,9 @@ enum {
 
 /* a union for accessing all cmd/completion descriptors */
 union Vmxnet3_GenericDesc {
-	u64				qword[2];
-	u32				dword[4];
-	u16				word[8];
+	__le64				qword[2];
+	__le32				dword[4];
+	__le16				word[8];
 	struct Vmxnet3_TxDesc		txd;
 	struct Vmxnet3_RxDesc		rxd;
 	struct Vmxnet3_TxCompDesc	tcd;
@@ -287,18 +371,24 @@ enum {
 
 
 struct Vmxnet3_GOSInfo {
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32		gosMisc:10;    /* other info about gos */
+	u32		gosVer:16;     /* gos version */
+	u32		gosType:4;     /* which guest */
+	u32		gosBits:2;    /* 32-bit or 64-bit? */
+#else
 	u32		gosBits:2;     /* 32-bit or 64-bit? */
 	u32		gosType:4;     /* which guest */
 	u32		gosVer:16;     /* gos version */
 	u32		gosMisc:10;    /* other info about gos */
+#endif  /* __BIG_ENDIAN_BITFIELD */
 };
 
-
 struct Vmxnet3_DriverInfo {
-	u32				version;
+	__le32				version;
 	struct Vmxnet3_GOSInfo		gos;
-	u32				vmxnet3RevSpt;
-	u32				uptVerSpt;
+	__le32				vmxnet3RevSpt;
+	__le32				uptVerSpt;
 };
 
 
@@ -315,42 +405,42 @@ struct Vmxnet3_DriverInfo {
 
 struct Vmxnet3_MiscConf {
 	struct Vmxnet3_DriverInfo driverInfo;
-	u64		uptFeatures;
-	u64		ddPA;         /* driver data PA */
-	u64		queueDescPA;  /* queue descriptor table PA */
-	u32		ddLen;        /* driver data len */
-	u32		queueDescLen; /* queue desc. table len in bytes */
-	u32		mtu;
-	u16		maxNumRxSG;
+	__le64		uptFeatures;
+	__le64		ddPA;         /* driver data PA */
+	__le64		queueDescPA;  /* queue descriptor table PA */
+	__le32		ddLen;        /* driver data len */
+	__le32		queueDescLen; /* queue desc. table len in bytes */
+	__le32		mtu;
+	__le16		maxNumRxSG;
 	u8		numTxQueues;
 	u8		numRxQueues;
-	u32		reserved[4];
+	__le32		reserved[4];
 };
 
 
 struct Vmxnet3_TxQueueConf {
-	u64		txRingBasePA;
-	u64		dataRingBasePA;
-	u64		compRingBasePA;
-	u64		ddPA;         /* driver data */
-	u64		reserved;
-	u32		txRingSize;   /* # of tx desc */
-	u32		dataRingSize; /* # of data desc */
-	u32		compRingSize; /* # of comp desc */
-	u32		ddLen;        /* size of driver data */
+	__le64		txRingBasePA;
+	__le64		dataRingBasePA;
+	__le64		compRingBasePA;
+	__le64		ddPA;         /* driver data */
+	__le64		reserved;
+	__le32		txRingSize;   /* # of tx desc */
+	__le32		dataRingSize; /* # of data desc */
+	__le32		compRingSize; /* # of comp desc */
+	__le32		ddLen;        /* size of driver data */
 	u8		intrIdx;
 	u8		_pad[7];
 };
 
 
 struct Vmxnet3_RxQueueConf {
-	u64		rxRingBasePA[2];
-	u64		compRingBasePA;
-	u64		ddPA;            /* driver data */
-	u64		reserved;
-	u32		rxRingSize[2];   /* # of rx desc */
-	u32		compRingSize;    /* # of rx comp desc */
-	u32		ddLen;           /* size of driver data */
+	__le64		rxRingBasePA[2];
+	__le64		compRingBasePA;
+	__le64		ddPA;            /* driver data */
+	__le64		reserved;
+	__le32		rxRingSize[2];   /* # of rx desc */
+	__le32		compRingSize;    /* # of rx comp desc */
+	__le32		ddLen;           /* size of driver data */
 	u8		intrIdx;
 	u8		_pad[7];
 };
@@ -381,7 +471,7 @@ struct Vmxnet3_IntrConf {
 	u8		eventIntrIdx;
 	u8		modLevels[VMXNET3_MAX_INTRS];	/* moderation level for
 							 * each intr */
-	u32		reserved[3];
+	__le32		reserved[3];
 };
 
 /* one bit per VLAN ID, the size is in the units of u32	*/
@@ -391,21 +481,21 @@ struct Vmxnet3_IntrConf {
 struct Vmxnet3_QueueStatus {
 	bool		stopped;
 	u8		_pad[3];
-	u32		error;
+	__le32		error;
 };
 
 
 struct Vmxnet3_TxQueueCtrl {
-	u32		txNumDeferred;
-	u32		txThreshold;
-	u64		reserved;
+	__le32		txNumDeferred;
+	__le32		txThreshold;
+	__le64		reserved;
 };
 
 
 struct Vmxnet3_RxQueueCtrl {
 	bool		updateRxProd;
 	u8		_pad[7];
-	u64		reserved;
+	__le64		reserved;
 };
 
 enum {
@@ -417,11 +507,11 @@ enum {
 };
 
 struct Vmxnet3_RxFilterConf {
-	u32		rxMode;       /* VMXNET3_RXM_xxx */
-	u16		mfTableLen;   /* size of the multicast filter table */
-	u16		_pad1;
-	u64		mfTablePA;    /* PA of the multicast filters table */
-	u32		vfTable[VMXNET3_VFT_SIZE]; /* vlan filter */
+	__le32		rxMode;       /* VMXNET3_RXM_xxx */
+	__le16		mfTableLen;   /* size of the multicast filter table */
+	__le16		_pad1;
+	__le64		mfTablePA;    /* PA of the multicast filters table */
+	__le32		vfTable[VMXNET3_VFT_SIZE]; /* vlan filter */
 };
 
 
@@ -444,7 +534,7 @@ struct Vmxnet3_PM_PktFilter {
 
 
 struct Vmxnet3_PMConf {
-	u16		wakeUpEvents;  /* VMXNET3_PM_WAKEUP_xxx */
+	__le16		wakeUpEvents;  /* VMXNET3_PM_WAKEUP_xxx */
 	u8		numFilters;
 	u8		pad[5];
 	struct Vmxnet3_PM_PktFilter filters[VMXNET3_PM_MAX_FILTERS];
@@ -452,9 +542,9 @@ struct Vmxnet3_PMConf {
 
 
 struct Vmxnet3_VariableLenConfDesc {
-	u32		confVer;
-	u32		confLen;
-	u64		confPA;
+	__le32		confVer;
+	__le32		confLen;
+	__le64		confPA;
 };
 
 
@@ -491,12 +581,12 @@ struct Vmxnet3_DSDevRead {
 
 /* All structures in DriverShared are padded to multiples of 8 bytes */
 struct Vmxnet3_DriverShared {
-	u32				magic;
+	__le32				magic;
 	/* make devRead start at 64bit boundaries */
-	u32					pad;
+	__le32				pad;
 	struct Vmxnet3_DSDevRead	devRead;
-	u32					ecr;
-	u32					reserved[5];
+	__le32				ecr;
+	__le32				reserved[5];
 };
 
 

drivers/net/vmxnet3/vmxnet3_ethtool.c

@@ -50,11 +50,13 @@ vmxnet3_set_rx_csum(struct net_device *netdev, u32 val)
 		adapter->rxcsum = val;
 		if (netif_running(netdev)) {
 			if (val)
-				adapter->shared->devRead.misc.uptFeatures |=
-								UPT1_F_RXCSUM;
+				set_flag_le64(
+				&adapter->shared->devRead.misc.uptFeatures,
+				UPT1_F_RXCSUM);
 			else
-				adapter->shared->devRead.misc.uptFeatures &=
-								~UPT1_F_RXCSUM;
+				reset_flag_le64(
+				&adapter->shared->devRead.misc.uptFeatures,
+				UPT1_F_RXCSUM);
 
 			VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
 					       VMXNET3_CMD_UPDATE_FEATURE);

drivers/net/vmxnet3/vmxnet3_int.h

@@ -330,14 +330,14 @@ struct vmxnet3_adapter {
 };
 
 #define VMXNET3_WRITE_BAR0_REG(adapter, reg, val)  \
-	writel((val), (adapter)->hw_addr0 + (reg))
+	writel(cpu_to_le32(val), (adapter)->hw_addr0 + (reg))
 #define VMXNET3_READ_BAR0_REG(adapter, reg)        \
-	readl((adapter)->hw_addr0 + (reg))
+	le32_to_cpu(readl((adapter)->hw_addr0 + (reg)))
 
 #define VMXNET3_WRITE_BAR1_REG(adapter, reg, val)  \
-	writel((val), (adapter)->hw_addr1 + (reg))
+	writel(cpu_to_le32(val), (adapter)->hw_addr1 + (reg))
 #define VMXNET3_READ_BAR1_REG(adapter, reg)        \
-	readl((adapter)->hw_addr1 + (reg))
+	le32_to_cpu(readl((adapter)->hw_addr1 + (reg)))
 
 #define VMXNET3_WAKE_QUEUE_THRESHOLD(tq)  (5)
 #define VMXNET3_RX_ALLOC_THRESHOLD(rq, ring_idx, adapter) \
@@ -353,6 +353,10 @@ struct vmxnet3_adapter {
 #define VMXNET3_MAX_ETH_HDR_SIZE    22
 #define VMXNET3_MAX_SKB_BUF_SIZE    (3*1024)
 
+void set_flag_le16(__le16 *data, u16 flag);
+void set_flag_le64(__le64 *data, u64 flag);
+void reset_flag_le64(__le64 *data, u64 flag);
+
 int
 vmxnet3_quiesce_dev(struct vmxnet3_adapter *adapter);