ice: Enable writing hardware filtering tables

Enable the driver to write the filtering hardware tables to allow for
changing of RSS rules. Upon loading of DDP package, a minimal configuration
should be written to hardware.

Introduce and initialize structures for storing configuration and make
the top level calls to configure the RSS tables to initial values. A packet
segment will be created but nothing is written to hardware yet.

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

1 files changed, 250 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_flow.c b/drivers/net/ethernet/intel/ice/ice_flow.c
new file mode 100644
index 000000000000..4828c64abe98
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_flow.c
@@ -0,0 +1,250 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019, Intel Corporation. */
+
+#include "ice_common.h"
+#include "ice_flow.h"
+
+/* Describe properties of a protocol header field */
+struct ice_flow_field_info {
+	enum ice_flow_seg_hdr hdr;
+	s16 off;	/* Offset from start of a protocol header, in bits */
+	u16 size;	/* Size of fields in bits */
+};
+
+#define ICE_FLOW_FLD_INFO(_hdr, _offset_bytes, _size_bytes) { \
+	.hdr = _hdr, \
+	.off = (_offset_bytes) * BITS_PER_BYTE, \
+	.size = (_size_bytes) * BITS_PER_BYTE, \
+}
+
+/* Table containing properties of supported protocol header fields */
+static const
+struct ice_flow_field_info ice_flds_info[ICE_FLOW_FIELD_IDX_MAX] = {
+	/* IPv4 / IPv6 */
+	/* ICE_FLOW_FIELD_IDX_IPV4_SA */
+	ICE_FLOW_FLD_INFO(ICE_FLOW_SEG_HDR_IPV4, 12, sizeof(struct in_addr)),
+	/* ICE_FLOW_FIELD_IDX_IPV4_DA */
+	ICE_FLOW_FLD_INFO(ICE_FLOW_SEG_HDR_IPV4, 16, sizeof(struct in_addr)),
+	/* ICE_FLOW_FIELD_IDX_IPV6_SA */
+	ICE_FLOW_FLD_INFO(ICE_FLOW_SEG_HDR_IPV6, 8, sizeof(struct in6_addr)),
+	/* ICE_FLOW_FIELD_IDX_IPV6_DA */
+	ICE_FLOW_FLD_INFO(ICE_FLOW_SEG_HDR_IPV6, 24, sizeof(struct in6_addr)),
+	/* Transport */
+	/* ICE_FLOW_FIELD_IDX_TCP_SRC_PORT */
+	ICE_FLOW_FLD_INFO(ICE_FLOW_SEG_HDR_TCP, 0, sizeof(__be16)),
+	/* ICE_FLOW_FIELD_IDX_TCP_DST_PORT */
+	ICE_FLOW_FLD_INFO(ICE_FLOW_SEG_HDR_TCP, 2, sizeof(__be16)),
+	/* ICE_FLOW_FIELD_IDX_UDP_SRC_PORT */
+	ICE_FLOW_FLD_INFO(ICE_FLOW_SEG_HDR_UDP, 0, sizeof(__be16)),
+	/* ICE_FLOW_FIELD_IDX_UDP_DST_PORT */
+	ICE_FLOW_FLD_INFO(ICE_FLOW_SEG_HDR_UDP, 2, sizeof(__be16)),
+};
+
+/**
+ * ice_flow_set_fld_ext - specifies locations of field from entry's input buffer
+ * @seg: packet segment the field being set belongs to
+ * @fld: field to be set
+ * @type: type of the field
+ * @val_loc: if not ICE_FLOW_FLD_OFF_INVAL, location of the value to match from
+ *           entry's input buffer
+ * @mask_loc: if not ICE_FLOW_FLD_OFF_INVAL, location of mask value from entry's
+ *            input buffer
+ * @last_loc: if not ICE_FLOW_FLD_OFF_INVAL, location of last/upper value from
+ *            entry's input buffer
+ *
+ * This helper function stores information of a field being matched, including
+ * the type of the field and the locations of the value to match, the mask, and
+ * and the upper-bound value in the start of the input buffer for a flow entry.
+ * This function should only be used for fixed-size data structures.
+ *
+ * This function also opportunistically determines the protocol headers to be
+ * present based on the fields being set. Some fields cannot be used alone to
+ * determine the protocol headers present. Sometimes, fields for particular
+ * protocol headers are not matched. In those cases, the protocol headers
+ * must be explicitly set.
+ */
+static void
+ice_flow_set_fld_ext(struct ice_flow_seg_info *seg, enum ice_flow_field fld,
+		     enum ice_flow_fld_match_type type, u16 val_loc,
+		     u16 mask_loc, u16 last_loc)
+{
+	u64 bit = BIT_ULL(fld);
+
+	seg->match |= bit;
+	if (type == ICE_FLOW_FLD_TYPE_RANGE)
+		seg->range |= bit;
+
+	seg->fields[fld].type = type;
+	seg->fields[fld].src.val = val_loc;
+	seg->fields[fld].src.mask = mask_loc;
+	seg->fields[fld].src.last = last_loc;
+
+	ICE_FLOW_SET_HDRS(seg, ice_flds_info[fld].hdr);
+}
+
+/**
+ * ice_flow_set_fld - specifies locations of field from entry's input buffer
+ * @seg: packet segment the field being set belongs to
+ * @fld: field to be set
+ * @val_loc: if not ICE_FLOW_FLD_OFF_INVAL, location of the value to match from
+ *           entry's input buffer
+ * @mask_loc: if not ICE_FLOW_FLD_OFF_INVAL, location of mask value from entry's
+ *            input buffer
+ * @last_loc: if not ICE_FLOW_FLD_OFF_INVAL, location of last/upper value from
+ *            entry's input buffer
+ * @range: indicate if field being matched is to be in a range
+ *
+ * This function specifies the locations, in the form of byte offsets from the
+ * start of the input buffer for a flow entry, from where the value to match,
+ * the mask value, and upper value can be extracted. These locations are then
+ * stored in the flow profile. When adding a flow entry associated with the
+ * flow profile, these locations will be used to quickly extract the values and
+ * create the content of a match entry. This function should only be used for
+ * fixed-size data structures.
+ */
+static void
+ice_flow_set_fld(struct ice_flow_seg_info *seg, enum ice_flow_field fld,
+		 u16 val_loc, u16 mask_loc, u16 last_loc, bool range)
+{
+	enum ice_flow_fld_match_type t = range ?
+		ICE_FLOW_FLD_TYPE_RANGE : ICE_FLOW_FLD_TYPE_REG;
+
+	ice_flow_set_fld_ext(seg, fld, t, val_loc, mask_loc, last_loc);
+}
+
+#define ICE_FLOW_RSS_SEG_HDR_L3_MASKS \
+	(ICE_FLOW_SEG_HDR_IPV4 | ICE_FLOW_SEG_HDR_IPV6)
+
+#define ICE_FLOW_RSS_SEG_HDR_L4_MASKS \
+	(ICE_FLOW_SEG_HDR_TCP | ICE_FLOW_SEG_HDR_UDP | ICE_FLOW_SEG_HDR_SCTP)
+
+#define ICE_FLOW_RSS_SEG_HDR_VAL_MASKS \
+	(ICE_FLOW_RSS_SEG_HDR_L3_MASKS | \
+	 ICE_FLOW_RSS_SEG_HDR_L4_MASKS)
+
+/**
+ * ice_flow_set_rss_seg_info - setup packet segments for RSS
+ * @segs: pointer to the flow field segment(s)
+ * @hash_fields: fields to be hashed on for the segment(s)
+ * @flow_hdr: protocol header fields within a packet segment
+ *
+ * Helper function to extract fields from hash bitmap and use flow
+ * header value to set flow field segment for further use in flow
+ * profile entry or removal.
+ */
+static enum ice_status
+ice_flow_set_rss_seg_info(struct ice_flow_seg_info *segs, u64 hash_fields,
+			  u32 flow_hdr)
+{
+	u64 val;
+	u8 i;
+
+	for_each_set_bit(i, (unsigned long *)&hash_fields,
+			 ICE_FLOW_FIELD_IDX_MAX)
+		ice_flow_set_fld(segs, (enum ice_flow_field)i,
+				 ICE_FLOW_FLD_OFF_INVAL, ICE_FLOW_FLD_OFF_INVAL,
+				 ICE_FLOW_FLD_OFF_INVAL, false);
+
+	ICE_FLOW_SET_HDRS(segs, flow_hdr);
+
+	if (segs->hdrs & ~ICE_FLOW_RSS_SEG_HDR_VAL_MASKS)
+		return ICE_ERR_PARAM;
+
+	val = (u64)(segs->hdrs & ICE_FLOW_RSS_SEG_HDR_L3_MASKS);
+	if (val && !is_power_of_2(val))
+		return ICE_ERR_CFG;
+
+	val = (u64)(segs->hdrs & ICE_FLOW_RSS_SEG_HDR_L4_MASKS);
+	if (val && !is_power_of_2(val))
+		return ICE_ERR_CFG;
+
+	return 0;
+}
+
+#define ICE_RSS_OUTER_HEADERS	1
+
+/**
+ * ice_add_rss_cfg_sync - add an RSS configuration
+ * @hashed_flds: hash bit fields (ICE_FLOW_HASH_*) to configure
+ * @addl_hdrs: protocol header fields
+ * @segs_cnt: packet segment count
+ *
+ * Assumption: lock has already been acquired for RSS list
+ */
+static enum ice_status
+ice_add_rss_cfg_sync(u64 hashed_flds, u32 addl_hdrs, u8 segs_cnt)
+{
+	struct ice_flow_seg_info *segs;
+	enum ice_status status;
+
+	if (!segs_cnt || segs_cnt > ICE_FLOW_SEG_MAX)
+		return ICE_ERR_PARAM;
+
+	segs = kcalloc(segs_cnt, sizeof(*segs), GFP_KERNEL);
+	if (!segs)
+		return ICE_ERR_NO_MEMORY;
+
+	/* Construct the packet segment info from the hashed fields */
+	status = ice_flow_set_rss_seg_info(&segs[segs_cnt - 1], hashed_flds,
+					   addl_hdrs);
+
+	kfree(segs);
+	return status;
+}
+
+/**
+ * ice_add_rss_cfg - add an RSS configuration with specified hashed fields
+ * @hw: pointer to the hardware structure
+ * @vsi_handle: software VSI handle
+ * @hashed_flds: hash bit fields (ICE_FLOW_HASH_*) to configure
+ * @addl_hdrs: protocol header fields
+ *
+ * This function will generate a flow profile based on fields associated with
+ * the input fields to hash on, the flow type and use the VSI number to add
+ * a flow entry to the profile.
+ */
+enum ice_status
+ice_add_rss_cfg(struct ice_hw *hw, u16 vsi_handle, u64 hashed_flds,
+		u32 addl_hdrs)
+{
+	enum ice_status status;
+
+	if (hashed_flds == ICE_HASH_INVALID ||
+	    !ice_is_vsi_valid(hw, vsi_handle))
+		return ICE_ERR_PARAM;
+
+	mutex_lock(&hw->rss_locks);
+	status = ice_add_rss_cfg_sync(hashed_flds, addl_hdrs,
+				      ICE_RSS_OUTER_HEADERS);
+	mutex_unlock(&hw->rss_locks);
+
+	return status;
+}
+
+/**
+ * ice_replay_rss_cfg - replay RSS configurations associated with VSI
+ * @hw: pointer to the hardware structure
+ * @vsi_handle: software VSI handle
+ */
+enum ice_status ice_replay_rss_cfg(struct ice_hw *hw, u16 vsi_handle)
+{
+	enum ice_status status = 0;
+	struct ice_rss_cfg *r;
+
+	if (!ice_is_vsi_valid(hw, vsi_handle))
+		return ICE_ERR_PARAM;
+
+	mutex_lock(&hw->rss_locks);
+	list_for_each_entry(r, &hw->rss_list_head, l_entry) {
+		if (test_bit(vsi_handle, r->vsis)) {
+			status = ice_add_rss_cfg_sync(r->hashed_flds,
+						      r->packet_hdr,
+						      ICE_RSS_OUTER_HEADERS);
+			if (status)
+				break;
+		}
+	}
+	mutex_unlock(&hw->rss_locks);
+
+	return status;
+}