i40e: implement support for flexible word payload

Add support for flexible payloads passed via ethtool user-def field.
This support is somewhat limited due to hardware design. The input set
can only be programmed once per filter type, and the flexible offset is
part of this filter input set. This means that the user cannot program
both a regular and a flexible filter at the same time for a given flow
type. Additionally, the user may not program two flexible filters of the
same flow type with different offsets, although they are allowed to
configure different values at that offset location.

We support a single flexible word (2byte) value per protocol type, and
we handle the FLX_PIT register using a list of flexible entries so that
each flow type may be configured separately.

Due to hardware implementation, the flexible data is offset from the
start of the packet payload, and thus may not be in part of the header
data. For this reason, the offset provided by the user defined data is
interpreted as a byte offset from the start of the matching payload.
Previous implementations have tried to represent the offset as from the
start of the frame, but this is not feasible because header sizes may
change due to options.

Change-Id: 36ed27995e97de63f9aea5ade5778ff038d6f811
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 3880e417f167..855ae1e359df 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -71,6 +71,9 @@ static void i40e_fdir(struct i40e_ring *tx_ring,
 	flex_ptype |= I40E_TXD_FLTR_QW0_PCTYPE_MASK &
 		      (fdata->pctype << I40E_TXD_FLTR_QW0_PCTYPE_SHIFT);
 
+	flex_ptype |= I40E_TXD_FLTR_QW0_PCTYPE_MASK &
+		      (fdata->flex_offset << I40E_TXD_FLTR_QW0_FLEXOFF_SHIFT);
+
 	/* Use LAN VSI Id if not programmed by user */
 	flex_ptype |= I40E_TXD_FLTR_QW0_DEST_VSI_MASK &
 		      ((u32)(fdata->dest_vsi ? : pf->vsi[pf->lan_vsi]->id) <<
@@ -223,6 +226,14 @@ static int i40e_add_del_fdir_udpv4(struct i40e_vsi *vsi,
 	ip->saddr = fd_data->src_ip;
 	udp->source = fd_data->src_port;
 
+	if (fd_data->flex_filter) {
+		u8 *payload = raw_packet + I40E_UDPIP_DUMMY_PACKET_LEN;
+		__be16 pattern = fd_data->flex_word;
+		u16 off = fd_data->flex_offset;
+
+		*((__force __be16 *)(payload + off)) = pattern;
+	}
+
 	fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_UDP;
 	ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
 	if (ret) {
@@ -289,6 +300,14 @@ static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi,
 	ip->saddr = fd_data->src_ip;
 	tcp->source = fd_data->src_port;
 
+	if (fd_data->flex_filter) {
+		u8 *payload = raw_packet + I40E_TCPIP_DUMMY_PACKET_LEN;
+		__be16 pattern = fd_data->flex_word;
+		u16 off = fd_data->flex_offset;
+
+		*((__force __be16 *)(payload + off)) = pattern;
+	}
+
 	fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_TCP;
 	ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
 	if (ret) {
@@ -362,6 +381,14 @@ static int i40e_add_del_fdir_ipv4(struct i40e_vsi *vsi,
 		ip->daddr = fd_data->dst_ip;
 		ip->protocol = 0;
 
+		if (fd_data->flex_filter) {
+			u8 *payload = raw_packet + I40E_IP_DUMMY_PACKET_LEN;
+			__be16 pattern = fd_data->flex_word;
+			u16 off = fd_data->flex_offset;
+
+			*((__force __be16 *)(payload + off)) = pattern;
+		}
+
 		fd_data->pctype = i;
 		ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
 		if (ret) {