iavf: field get conversion

Refactor the iavf driver to use FIELD_GET() for mask and shift reads,
which reduces lines of code and adds clarity of intent.

This code was generated by the following coccinelle/spatch script and
then manually repaired in a later patch.

@get@
constant shift,mask;
type T;
expression a;
@@
-((T)((a) & mask) >> shift)
+FIELD_GET(mask, a)

and applied via:
spatch --sp-file field_prep.cocci --in-place --dir \
 drivers/net/ethernet/intel/

Cc: Julia Lawall <Julia.Lawall@inria.fr>
Reviewed-by: Marcin Szycik <marcin.szycik@linux.intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/iavf/iavf_ethtool.c

@@ -1017,8 +1017,7 @@ iavf_parse_rx_flow_user_data(struct ethtool_rx_flow_spec *fsp,
 #define IAVF_USERDEF_FLEX_MAX_OFFS_VAL 504
 		flex = &fltr->flex_words[cnt++];
 		flex->word = value & IAVF_USERDEF_FLEX_WORD_M;
-		flex->offset = (value & IAVF_USERDEF_FLEX_OFFS_M) >>
-			     IAVF_USERDEF_FLEX_OFFS_S;
+		flex->offset = FIELD_GET(IAVF_USERDEF_FLEX_OFFS_M, value);
 		if (flex->offset > IAVF_USERDEF_FLEX_MAX_OFFS_VAL)
 			return -EINVAL;
 	}

drivers/net/ethernet/intel/iavf/iavf_txrx.c

@@ -989,11 +989,9 @@ static void iavf_rx_checksum(struct iavf_vsi *vsi,
 	u64 qword;
 
 	qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
-	ptype = (qword & IAVF_RXD_QW1_PTYPE_MASK) >> IAVF_RXD_QW1_PTYPE_SHIFT;
-	rx_error = (qword & IAVF_RXD_QW1_ERROR_MASK) >>
-		   IAVF_RXD_QW1_ERROR_SHIFT;
-	rx_status = (qword & IAVF_RXD_QW1_STATUS_MASK) >>
-		    IAVF_RXD_QW1_STATUS_SHIFT;
+	ptype = FIELD_GET(IAVF_RXD_QW1_PTYPE_MASK, qword);
+	rx_error = FIELD_GET(IAVF_RXD_QW1_ERROR_MASK, qword);
+	rx_status = FIELD_GET(IAVF_RXD_QW1_STATUS_MASK, qword);
 	decoded = decode_rx_desc_ptype(ptype);
 
 	skb->ip_summed = CHECKSUM_NONE;
@@ -1534,8 +1532,7 @@ static int iavf_clean_rx_irq(struct iavf_ring *rx_ring, int budget)
 		if (!iavf_test_staterr(rx_desc, IAVF_RXD_DD))
 			break;
 
-		size = (qword & IAVF_RXD_QW1_LENGTH_PBUF_MASK) >>
-		       IAVF_RXD_QW1_LENGTH_PBUF_SHIFT;
+		size = FIELD_GET(IAVF_RXD_QW1_LENGTH_PBUF_MASK, qword);
 
 		iavf_trace(clean_rx_irq, rx_ring, rx_desc, skb);
 		rx_buffer = iavf_get_rx_buffer(rx_ring, size);
@@ -1582,8 +1579,7 @@ static int iavf_clean_rx_irq(struct iavf_ring *rx_ring, int budget)
 		total_rx_bytes += skb->len;
 
 		qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
-		rx_ptype = (qword & IAVF_RXD_QW1_PTYPE_MASK) >>
-			   IAVF_RXD_QW1_PTYPE_SHIFT;
+		rx_ptype = FIELD_GET(IAVF_RXD_QW1_PTYPE_MASK, qword);
 
 		/* populate checksum, VLAN, and protocol */
 		iavf_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype);
@@ -2291,8 +2287,7 @@ static void iavf_tx_map(struct iavf_ring *tx_ring, struct sk_buff *skb,
 
 	if (tx_flags & IAVF_TX_FLAGS_HW_VLAN) {
 		td_cmd |= IAVF_TX_DESC_CMD_IL2TAG1;
-		td_tag = (tx_flags & IAVF_TX_FLAGS_VLAN_MASK) >>
-			 IAVF_TX_FLAGS_VLAN_SHIFT;
+		td_tag = FIELD_GET(IAVF_TX_FLAGS_VLAN_MASK, tx_flags);
 	}
 
 	first->tx_flags = tx_flags;
@@ -2468,8 +2463,7 @@ static netdev_tx_t iavf_xmit_frame_ring(struct sk_buff *skb,
 	if (tx_flags & IAVF_TX_FLAGS_HW_OUTER_SINGLE_VLAN) {
 		cd_type_cmd_tso_mss |= IAVF_TX_CTX_DESC_IL2TAG2 <<
 			IAVF_TXD_CTX_QW1_CMD_SHIFT;
-		cd_l2tag2 = (tx_flags & IAVF_TX_FLAGS_VLAN_MASK) >>
-			IAVF_TX_FLAGS_VLAN_SHIFT;
+		cd_l2tag2 = FIELD_GET(IAVF_TX_FLAGS_VLAN_MASK, tx_flags);
 	}
 
 	/* obtain protocol of skb */