return 0;
}
-static void set_flowkey_fields(struct nix_rx_flowkey_alg *alg, u32 flow_cfg)
+static int set_flowkey_fields(struct nix_rx_flowkey_alg *alg, u32 flow_cfg)
{
- struct nix_rx_flowkey_alg *field = NULL;
- int idx, key_type;
+ int idx, nr_field, key_off, field_marker, keyoff_marker;
+ int max_key_off, max_bit_pos, group_member;
+ struct nix_rx_flowkey_alg *field;
+ struct nix_rx_flowkey_alg tmp;
+ u32 key_type, valid_key;
if (!alg)
- return;
+ return -EINVAL;
- /* FIELD0: IPv4
- * FIELD1: IPv6
- * FIELD2: TCP/UDP/SCTP/ALL
- * FIELD3: Unused
- * FIELD4: Unused
- *
- * Each of the 32 possible flow key algorithm definitions should
+#define FIELDS_PER_ALG 5
+#define MAX_KEY_OFF 40
+ /* Clear all fields */
+ memset(alg, 0, sizeof(uint64_t) * FIELDS_PER_ALG);
+
+ /* Each of the 32 possible flow key algorithm definitions should
* fall into above incremental config (except ALG0). Otherwise a
* single NPC MCAM entry is not sufficient for supporting RSS.
*
* If a different definition or combination needed then NPC MCAM
* has to be programmed to filter such pkts and it's action should
* point to this definition to calculate flowtag or hash.
+ *
+ * The `for loop` goes over _all_ protocol field and the following
+ * variables depicts the state machine forward progress logic.
+ *
+ * keyoff_marker - Enabled when hash byte length needs to be accounted
+ * in field->key_offset update.
+ * field_marker - Enabled when a new field needs to be selected.
+ * group_member - Enabled when protocol is part of a group.
*/
- for (idx = 0; idx < 32; idx++) {
- key_type = flow_cfg & BIT_ULL(idx);
- if (!key_type)
- continue;
+
+ keyoff_marker = 0; max_key_off = 0; group_member = 0;
+ nr_field = 0; key_off = 0; field_marker = 1;
+ field = &tmp; max_bit_pos = fls(flow_cfg);
+ for (idx = 0;
+ idx < max_bit_pos && nr_field < FIELDS_PER_ALG &&
+ key_off < MAX_KEY_OFF; idx++) {
+ key_type = BIT(idx);
+ valid_key = flow_cfg & key_type;
+ /* Found a field marker, reset the field values */
+ if (field_marker)
+ memset(&tmp, 0, sizeof(tmp));
+
switch (key_type) {
case NIX_FLOW_KEY_TYPE_PORT:
- field = &alg[0];
field->sel_chan = true;
/* This should be set to 1, when SEL_CHAN is set */
field->bytesm1 = 1;
+ field_marker = true;
+ keyoff_marker = true;
break;
case NIX_FLOW_KEY_TYPE_IPV4:
- field = &alg[0];
field->lid = NPC_LID_LC;
field->ltype_match = NPC_LT_LC_IP;
field->hdr_offset = 12; /* SIP offset */
field->bytesm1 = 7; /* SIP + DIP, 8 bytes */
field->ltype_mask = 0xF; /* Match only IPv4 */
+ field_marker = true;
+ keyoff_marker = false;
break;
case NIX_FLOW_KEY_TYPE_IPV6:
- field = &alg[1];
field->lid = NPC_LID_LC;
field->ltype_match = NPC_LT_LC_IP6;
field->hdr_offset = 8; /* SIP offset */
field->bytesm1 = 31; /* SIP + DIP, 32 bytes */
field->ltype_mask = 0xF; /* Match only IPv6 */
+ field_marker = true;
+ keyoff_marker = true;
break;
case NIX_FLOW_KEY_TYPE_TCP:
case NIX_FLOW_KEY_TYPE_UDP:
case NIX_FLOW_KEY_TYPE_SCTP:
- field = &alg[2];
field->lid = NPC_LID_LD;
field->bytesm1 = 3; /* Sport + Dport, 4 bytes */
- if (key_type == NIX_FLOW_KEY_TYPE_TCP)
+ if (key_type == NIX_FLOW_KEY_TYPE_TCP && valid_key) {
field->ltype_match |= NPC_LT_LD_TCP;
- else if (key_type == NIX_FLOW_KEY_TYPE_UDP)
+ group_member = true;
+ } else if (key_type == NIX_FLOW_KEY_TYPE_UDP &&
+ valid_key) {
field->ltype_match |= NPC_LT_LD_UDP;
- else if (key_type == NIX_FLOW_KEY_TYPE_SCTP)
+ group_member = true;
+ } else if (key_type == NIX_FLOW_KEY_TYPE_SCTP &&
+ valid_key) {
field->ltype_match |= NPC_LT_LD_SCTP;
- field->key_offset = 32; /* After IPv4/v6 SIP, DIP */
+ group_member = true;
+ }
field->ltype_mask = ~field->ltype_match;
+ if (key_type == NIX_FLOW_KEY_TYPE_SCTP) {
+ /* Handle the case where any of the group item
+ * is enabled in the group but not the final one
+ */
+ if (group_member) {
+ valid_key = true;
+ group_member = false;
+ }
+ field_marker = true;
+ keyoff_marker = true;
+ } else {
+ field_marker = false;
+ keyoff_marker = false;
+ }
break;
}
- if (field)
- field->ena = 1;
- field = NULL;
+ field->ena = 1;
+
+ /* Found a valid flow key type */
+ if (valid_key) {
+ field->key_offset = key_off;
+ memcpy(&alg[nr_field], field, sizeof(*field));
+ max_key_off = max(max_key_off, field->bytesm1 + 1);
+
+ /* Found a field marker, get the next field */
+ if (field_marker)
+ nr_field++;
+ }
+
+ /* Found a keyoff marker, update the new key_off */
+ if (keyoff_marker) {
+ key_off += max_key_off;
+ max_key_off = 0;
+ }
}
+ /* Processed all the flow key types */
+ if (idx == max_bit_pos && key_off <= MAX_KEY_OFF)
+ return 0;
+ else
+ return NIX_AF_ERR_RSS_NOSPC_FIELD;
}
static void nix_rx_flowkey_alg_cfg(struct rvu *rvu, int blkaddr)
{
-#define FIELDS_PER_ALG 5
u64 field[NIX_FLOW_KEY_ALG_MAX][FIELDS_PER_ALG];
u32 flowkey_cfg, minkey_cfg;
int alg, fid;
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