ixgbe: always set header length in SRRCTL

As per the documentation for 82599 in order to support hardware RSC the
header size must be set.  This is only currently done for packet split
mode.  This patch sets the header buffer length for all modes.
Signed-off-by: NAlexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe_main.c

@@ -1754,28 +1754,20 @@ static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter, int index)
 	srrctl &= ~IXGBE_SRRCTL_BSIZEHDR_MASK;
 	srrctl &= ~IXGBE_SRRCTL_BSIZEPKT_MASK;
 
+	srrctl |= (IXGBE_RX_HDR_SIZE << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
+		  IXGBE_SRRCTL_BSIZEHDR_MASK;
+
 	if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
-		u16 bufsz = IXGBE_RXBUFFER_2048;
-		/* grow the amount we can receive on large page machines */
-		if (bufsz < (PAGE_SIZE / 2))
-			bufsz = (PAGE_SIZE / 2);
-		/* cap the bufsz at our largest descriptor size */
-		bufsz = min((u16)IXGBE_MAX_RXBUFFER, bufsz);
-
-		srrctl |= bufsz >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
+#if (PAGE_SIZE / 2) > IXGBE_MAX_RXBUFFER
+		srrctl |= IXGBE_MAX_RXBUFFER >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
+#else
+		srrctl |= (PAGE_SIZE / 2) >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
+#endif
 		srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
-		srrctl |= ((IXGBE_RX_HDR_SIZE <<
-		            IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
-		           IXGBE_SRRCTL_BSIZEHDR_MASK);
 	} else {
+		srrctl |= ALIGN(rx_ring->rx_buf_len, 1024) >>
+			  IXGBE_SRRCTL_BSIZEPKT_SHIFT;
 		srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;
-
-		if (rx_ring->rx_buf_len == MAXIMUM_ETHERNET_VLAN_SIZE)
-			srrctl |= IXGBE_RXBUFFER_2048 >>
-			          IXGBE_SRRCTL_BSIZEPKT_SHIFT;
-		else
-			srrctl |= rx_ring->rx_buf_len >>
-			          IXGBE_SRRCTL_BSIZEPKT_SHIFT;
 	}
 
 	IXGBE_WRITE_REG(&adapter->hw, IXGBE_SRRCTL(index), srrctl);