igb trivial annotations

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/igb/e1000_82575.h

@@ -61,28 +61,28 @@
 /* Receive Descriptor - Advanced */
 union e1000_adv_rx_desc {
 	struct {
-		u64 pkt_addr;             /* Packet buffer address */
-		u64 hdr_addr;             /* Header buffer address */
+		__le64 pkt_addr;             /* Packet buffer address */
+		__le64 hdr_addr;             /* Header buffer address */
 	} read;
 	struct {
 		struct {
 			struct {
-				u16 pkt_info;   /* RSS type, Packet type */
-				u16 hdr_info;   /* Split Header,
+				__le16 pkt_info;   /* RSS type, Packet type */
+				__le16 hdr_info;   /* Split Header,
 						    * header buffer length */
 			} lo_dword;
 			union {
-				u32 rss;          /* RSS Hash */
+				__le32 rss;          /* RSS Hash */
 				struct {
-					u16 ip_id;    /* IP id */
-					u16 csum;     /* Packet Checksum */
+					__le16 ip_id;    /* IP id */
+					__le16 csum;     /* Packet Checksum */
 				} csum_ip;
 			} hi_dword;
 		} lower;
 		struct {
-			u32 status_error;     /* ext status/error */
-			u16 length;           /* Packet length */
-			u16 vlan;             /* VLAN tag */
+			__le32 status_error;     /* ext status/error */
+			__le16 length;           /* Packet length */
+			__le16 vlan;             /* VLAN tag */
 		} upper;
 	} wb;  /* writeback */
 };
@@ -97,14 +97,14 @@ union e1000_adv_rx_desc {
 /* Transmit Descriptor - Advanced */
 union e1000_adv_tx_desc {
 	struct {
-		u64 buffer_addr;    /* Address of descriptor's data buf */
-		u32 cmd_type_len;
-		u32 olinfo_status;
+		__le64 buffer_addr;    /* Address of descriptor's data buf */
+		__le32 cmd_type_len;
+		__le32 olinfo_status;
 	} read;
 	struct {
-		u64 rsvd;       /* Reserved */
-		u32 nxtseq_seed;
-		u32 status;
+		__le64 rsvd;       /* Reserved */
+		__le32 nxtseq_seed;
+		__le32 status;
 	} wb;
 };
 
@@ -119,10 +119,10 @@ union e1000_adv_tx_desc {
 
 /* Context descriptors */
 struct e1000_adv_tx_context_desc {
-	u32 vlan_macip_lens;
-	u32 seqnum_seed;
-	u32 type_tucmd_mlhl;
-	u32 mss_l4len_idx;
+	__le32 vlan_macip_lens;
+	__le32 seqnum_seed;
+	__le32 type_tucmd_mlhl;
+	__le32 mss_l4len_idx;
 };
 
 #define E1000_ADVTXD_MACLEN_SHIFT    9  /* Adv ctxt desc mac len shift */

drivers/net/igb/e1000_hw.h

@@ -143,35 +143,35 @@ enum e1000_fc_type {
 
 /* Receive Descriptor */
 struct e1000_rx_desc {
-	u64 buffer_addr; /* Address of the descriptor's data buffer */
-	u16 length;      /* Length of data DMAed into data buffer */
-	u16 csum;        /* Packet checksum */
+	__le64 buffer_addr; /* Address of the descriptor's data buffer */
+	__le16 length;      /* Length of data DMAed into data buffer */
+	__le16 csum;        /* Packet checksum */
 	u8  status;      /* Descriptor status */
 	u8  errors;      /* Descriptor Errors */
-	u16 special;
+	__le16 special;
 };
 
 /* Receive Descriptor - Extended */
 union e1000_rx_desc_extended {
 	struct {
-		u64 buffer_addr;
-		u64 reserved;
+		__le64 buffer_addr;
+		__le64 reserved;
 	} read;
 	struct {
 		struct {
-			u32 mrq;              /* Multiple Rx Queues */
+			__le32 mrq;              /* Multiple Rx Queues */
 			union {
-				u32 rss;            /* RSS Hash */
+				__le32 rss;            /* RSS Hash */
 				struct {
-					u16 ip_id;  /* IP id */
-					u16 csum;   /* Packet Checksum */
+					__le16 ip_id;  /* IP id */
+					__le16 csum;   /* Packet Checksum */
 				} csum_ip;
 			} hi_dword;
 		} lower;
 		struct {
-			u32 status_error;     /* ext status/error */
-			u16 length;
-			u16 vlan;             /* VLAN tag */
+			__le32 status_error;     /* ext status/error */
+			__le16 length;
+			__le16 vlan;             /* VLAN tag */
 		} upper;
 	} wb;  /* writeback */
 };
@@ -181,49 +181,49 @@ union e1000_rx_desc_extended {
 union e1000_rx_desc_packet_split {
 	struct {
 		/* one buffer for protocol header(s), three data buffers */
-		u64 buffer_addr[MAX_PS_BUFFERS];
+		__le64 buffer_addr[MAX_PS_BUFFERS];
 	} read;
 	struct {
 		struct {
-			u32 mrq;              /* Multiple Rx Queues */
+			__le32 mrq;              /* Multiple Rx Queues */
 			union {
-				u32 rss;              /* RSS Hash */
+				__le32 rss;              /* RSS Hash */
 				struct {
-					u16 ip_id;    /* IP id */
-					u16 csum;     /* Packet Checksum */
+					__le16 ip_id;    /* IP id */
+					__le16 csum;     /* Packet Checksum */
 				} csum_ip;
 			} hi_dword;
 		} lower;
 		struct {
-			u32 status_error;     /* ext status/error */
-			u16 length0;          /* length of buffer 0 */
-			u16 vlan;             /* VLAN tag */
+			__le32 status_error;     /* ext status/error */
+			__le16 length0;          /* length of buffer 0 */
+			__le16 vlan;             /* VLAN tag */
 		} middle;
 		struct {
-			u16 header_status;
-			u16 length[3];        /* length of buffers 1-3 */
+			__le16 header_status;
+			__le16 length[3];        /* length of buffers 1-3 */
 		} upper;
-		u64 reserved;
+		__le64 reserved;
 	} wb; /* writeback */
 };
 
 /* Transmit Descriptor */
 struct e1000_tx_desc {
-	u64 buffer_addr;      /* Address of the descriptor's data buffer */
+	__le64 buffer_addr;      /* Address of the descriptor's data buffer */
 	union {
-		u32 data;
+		__le32 data;
 		struct {
-			u16 length;    /* Data buffer length */
+			__le16 length;    /* Data buffer length */
 			u8 cso;        /* Checksum offset */
 			u8 cmd;        /* Descriptor control */
 		} flags;
 	} lower;
 	union {
-		u32 data;
+		__le32 data;
 		struct {
 			u8 status;     /* Descriptor status */
 			u8 css;        /* Checksum start */
-			u16 special;
+			__le16 special;
 		} fields;
 	} upper;
 };
@@ -231,49 +231,49 @@ struct e1000_tx_desc {
 /* Offload Context Descriptor */
 struct e1000_context_desc {
 	union {
-		u32 ip_config;
+		__le32 ip_config;
 		struct {
 			u8 ipcss;      /* IP checksum start */
 			u8 ipcso;      /* IP checksum offset */
-			u16 ipcse;     /* IP checksum end */
+			__le16 ipcse;     /* IP checksum end */
 		} ip_fields;
 	} lower_setup;
 	union {
-		u32 tcp_config;
+		__le32 tcp_config;
 		struct {
 			u8 tucss;      /* TCP checksum start */
 			u8 tucso;      /* TCP checksum offset */
-			u16 tucse;     /* TCP checksum end */
+			__le16 tucse;     /* TCP checksum end */
 		} tcp_fields;
 	} upper_setup;
-	u32 cmd_and_length;
+	__le32 cmd_and_length;
 	union {
-		u32 data;
+		__le32 data;
 		struct {
 			u8 status;     /* Descriptor status */
 			u8 hdr_len;    /* Header length */
-			u16 mss;       /* Maximum segment size */
+			__le16 mss;       /* Maximum segment size */
 		} fields;
 	} tcp_seg_setup;
 };
 
 /* Offload data descriptor */
 struct e1000_data_desc {
-	u64 buffer_addr;   /* Address of the descriptor's buffer address */
+	__le64 buffer_addr;   /* Address of the descriptor's buffer address */
 	union {
-		u32 data;
+		__le32 data;
 		struct {
-			u16 length;    /* Data buffer length */
+			__le16 length;    /* Data buffer length */
 			u8 typ_len_ext;
 			u8 cmd;
 		} flags;
 	} lower;
 	union {
-		u32 data;
+		__le32 data;
 		struct {
 			u8 status;     /* Descriptor status */
 			u8 popts;      /* Packet Options */
-			u16 special;
+			__le16 special;
 		} fields;
 	} upper;
 };

drivers/net/igb/igb_main.c

@@ -3254,6 +3254,13 @@ static int igb_clean_rx_ring_msix(struct napi_struct *napi, int budget)
 
 	return 1;
 }
+
+static inline u32 get_head(struct igb_ring *tx_ring)
+{
+	void *end = (struct e1000_tx_desc *)tx_ring->desc + tx_ring->count;
+	return le32_to_cpu(*(volatile __le32 *)end);
+}
+
 /**
  * igb_clean_tx_irq - Reclaim resources after transmit completes
  * @adapter: board private structure
@@ -3275,9 +3282,7 @@ static bool igb_clean_tx_irq(struct igb_adapter *adapter,
 	unsigned int total_bytes = 0, total_packets = 0;
 
 	rmb();
-	head = *(volatile u32 *)((struct e1000_tx_desc *)tx_ring->desc
-				 + tx_ring->count);
-	head = le32_to_cpu(head);
+	head = get_head(tx_ring);
 	i = tx_ring->next_to_clean;
 	while (1) {
 		while (i != head) {
@@ -3312,9 +3317,7 @@ static bool igb_clean_tx_irq(struct igb_adapter *adapter,
 		}
 		oldhead = head;
 		rmb();
-		head = *(volatile u32 *)((struct e1000_tx_desc *)tx_ring->desc
-					 + tx_ring->count);
-		head = le32_to_cpu(head);
+		head = get_head(tx_ring);
 		if (head == oldhead)
 			goto done_cleaning;
 	}  /* while (1) */
@@ -3388,7 +3391,7 @@ static bool igb_clean_tx_irq(struct igb_adapter *adapter,
  * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
  * @skb: pointer to sk_buff to be indicated to stack
  **/
-static void igb_receive_skb(struct igb_adapter *adapter, u8 status, u16 vlan,
+static void igb_receive_skb(struct igb_adapter *adapter, u8 status, __le16 vlan,
 			    struct sk_buff *skb)
 {
 	if (adapter->vlgrp && (status & E1000_RXD_STAT_VP))