ice: Support IPv4 Flow Director filters

Support the addition and deletion of IPv4 filters.

Supported fields are: src-ip, dst-ip, src-port, and dst-port
Supported flow-types are: tcp4, udp4, sctp4, ip4

Example usage:

ethtool -N eth0 flow-type tcp4 src-ip 192.168.0.55 dst-ip 172.16.0.55 \
src-port 16 dst-port 12 action 32

Signed-off-by: Henry Tieman <henry.w.tieman@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 173a167c96d9..cda7e05bd8ae 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -16,6 +16,88 @@
 #define ICE_RX_HDR_SIZE		256
 
 #define FDIR_DESC_RXDID 0x40
+#define ICE_FDIR_CLEAN_DELAY 10
+
+/**
+ * ice_prgm_fdir_fltr - Program a Flow Director filter
+ * @vsi: VSI to send dummy packet
+ * @fdir_desc: flow director descriptor
+ * @raw_packet: allocated buffer for flow director
+ */
+int
+ice_prgm_fdir_fltr(struct ice_vsi *vsi, struct ice_fltr_desc *fdir_desc,
+		   u8 *raw_packet)
+{
+	struct ice_tx_buf *tx_buf, *first;
+	struct ice_fltr_desc *f_desc;
+	struct ice_tx_desc *tx_desc;
+	struct ice_ring *tx_ring;
+	struct device *dev;
+	dma_addr_t dma;
+	u32 td_cmd;
+	u16 i;
+
+	/* VSI and Tx ring */
+	if (!vsi)
+		return -ENOENT;
+	tx_ring = vsi->tx_rings[0];
+	if (!tx_ring || !tx_ring->desc)
+		return -ENOENT;
+	dev = tx_ring->dev;
+
+	/* we are using two descriptors to add/del a filter and we can wait */
+	for (i = ICE_FDIR_CLEAN_DELAY; ICE_DESC_UNUSED(tx_ring) < 2; i--) {
+		if (!i)
+			return -EAGAIN;
+		msleep_interruptible(1);
+	}
+
+	dma = dma_map_single(dev, raw_packet, ICE_FDIR_MAX_RAW_PKT_SIZE,
+			     DMA_TO_DEVICE);
+
+	if (dma_mapping_error(dev, dma))
+		return -EINVAL;
+
+	/* grab the next descriptor */
+	i = tx_ring->next_to_use;
+	first = &tx_ring->tx_buf[i];
+	f_desc = ICE_TX_FDIRDESC(tx_ring, i);
+	memcpy(f_desc, fdir_desc, sizeof(*f_desc));
+
+	i++;
+	i = (i < tx_ring->count) ? i : 0;
+	tx_desc = ICE_TX_DESC(tx_ring, i);
+	tx_buf = &tx_ring->tx_buf[i];
+
+	i++;
+	tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
+
+	memset(tx_buf, 0, sizeof(*tx_buf));
+	dma_unmap_len_set(tx_buf, len, ICE_FDIR_MAX_RAW_PKT_SIZE);
+	dma_unmap_addr_set(tx_buf, dma, dma);
+
+	tx_desc->buf_addr = cpu_to_le64(dma);
+	td_cmd = ICE_TXD_LAST_DESC_CMD | ICE_TX_DESC_CMD_DUMMY |
+		 ICE_TX_DESC_CMD_RE;
+
+	tx_buf->tx_flags = ICE_TX_FLAGS_DUMMY_PKT;
+	tx_buf->raw_buf = raw_packet;
+
+	tx_desc->cmd_type_offset_bsz =
+		ice_build_ctob(td_cmd, 0, ICE_FDIR_MAX_RAW_PKT_SIZE, 0);
+
+	/* Force memory write to complete before letting h/w know
+	 * there are new descriptors to fetch.
+	 */
+	wmb();
+
+	/* mark the data descriptor to be watched */
+	first->next_to_watch = tx_desc;
+
+	writel(tx_ring->next_to_use, tx_ring->tail);
+
+	return 0;
+}
 
 /**
  * ice_unmap_and_free_tx_buf - Release a Tx buffer