[PATCH net-next v2 6/6] iavf: enable symmetric RSS Toeplitz hash

[Ahmed Zaki <ahmed.zaki@intel.com>]

Allow the VFs to support symmetric RSS for any flow type. The symmetric
RSS will not be supported on PFs not advertising the ADV RSS Offload
flag (ADV_RSS_SUPPORT()), for example the E700 series (i40e).

Reviewed-by: Madhu Chittim <madhu.chittim@intel.com>
Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
---
 .../net/ethernet/intel/iavf/iavf_adv_rss.c    |  8 +++++--
 .../net/ethernet/intel/iavf/iavf_adv_rss.h    |  3 ++-
 .../net/ethernet/intel/iavf/iavf_ethtool.c    | 22 +++++++++++++++----
 3 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_adv_rss.c b/drivers/net/ethernet/intel/iavf/iavf_adv_rss.c
index 6edbf134b73f..a9e1da35e248 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_adv_rss.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_adv_rss.c
@@ -95,17 +95,21 @@ iavf_fill_adv_rss_sctp_hdr(struct virtchnl_proto_hdr *hdr, u64 hash_flds)
  * @rss_cfg: the virtchnl message to be filled with RSS configuration setting
  * @packet_hdrs: the RSS configuration protocol header types
  * @hash_flds: the RSS configuration protocol hash fields
+ * @symm: if true, symmetric hash is required
  *
  * Returns 0 if the RSS configuration virtchnl message is filled successfully
  */
 int
 iavf_fill_adv_rss_cfg_msg(struct virtchnl_rss_cfg *rss_cfg,
-			  u32 packet_hdrs, u64 hash_flds)
+			  u32 packet_hdrs, u64 hash_flds, bool symm)
 {
 	struct virtchnl_proto_hdrs *proto_hdrs = &rss_cfg->proto_hdrs;
 	struct virtchnl_proto_hdr *hdr;
 
-	rss_cfg->rss_algorithm = VIRTCHNL_RSS_ALG_TOEPLITZ_ASYMMETRIC;
+	if (symm)
+		rss_cfg->rss_algorithm = VIRTCHNL_RSS_ALG_TOEPLITZ_SYMMETRIC;
+	else
+		rss_cfg->rss_algorithm = VIRTCHNL_RSS_ALG_TOEPLITZ_ASYMMETRIC;
 
 	proto_hdrs->tunnel_level = 0;	/* always outer layer */
 
diff --git a/drivers/net/ethernet/intel/iavf/iavf_adv_rss.h b/drivers/net/ethernet/intel/iavf/iavf_adv_rss.h
index 4d3be11af7aa..e31eb2afebea 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_adv_rss.h
+++ b/drivers/net/ethernet/intel/iavf/iavf_adv_rss.h
@@ -80,13 +80,14 @@ struct iavf_adv_rss {
 
 	u32 packet_hdrs;
 	u64 hash_flds;
+	bool symm;
 
 	struct virtchnl_rss_cfg cfg_msg;
 };
 
 int
 iavf_fill_adv_rss_cfg_msg(struct virtchnl_rss_cfg *rss_cfg,
-			  u32 packet_hdrs, u64 hash_flds);
+			  u32 packet_hdrs, u64 hash_flds, bool symm);
 struct iavf_adv_rss *
 iavf_find_adv_rss_cfg_by_hdrs(struct iavf_adapter *adapter, u32 packet_hdrs);
 void
diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index 90397293525f..0eec30c390d6 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -1618,6 +1618,7 @@ iavf_set_adv_rss_hash_opt(struct iavf_adapter *adapter,
 	struct iavf_adv_rss *rss_old, *rss_new;
 	bool rss_new_add = false;
 	int count = 50, err = 0;
+	bool symm = false;
 	u64 hash_flds;
 	u32 hdrs;
 
@@ -1632,11 +1633,15 @@ iavf_set_adv_rss_hash_opt(struct iavf_adapter *adapter,
 	if (hash_flds == IAVF_ADV_RSS_HASH_INVALID)
 		return -EINVAL;
 
+	if (cmd->data & RXH_SYMMETRIC)
+		symm = true;
+
 	rss_new = kzalloc(sizeof(*rss_new), GFP_KERNEL);
 	if (!rss_new)
 		return -ENOMEM;
 
-	if (iavf_fill_adv_rss_cfg_msg(&rss_new->cfg_msg, hdrs, hash_flds)) {
+	if (iavf_fill_adv_rss_cfg_msg(&rss_new->cfg_msg, hdrs, hash_flds,
+				      symm)) {
 		kfree(rss_new);
 		return -EINVAL;
 	}
@@ -1655,9 +1660,11 @@ iavf_set_adv_rss_hash_opt(struct iavf_adapter *adapter,
 	if (rss_old) {
 		if (rss_old->state != IAVF_ADV_RSS_ACTIVE) {
 			err = -EBUSY;
-		} else if (rss_old->hash_flds != hash_flds) {
+		} else if (rss_old->hash_flds != hash_flds ||
+			   rss_old->symm != symm) {
 			rss_old->state = IAVF_ADV_RSS_ADD_REQUEST;
 			rss_old->hash_flds = hash_flds;
+			rss_old->symm = symm;
 			memcpy(&rss_old->cfg_msg, &rss_new->cfg_msg,
 			       sizeof(rss_new->cfg_msg));
 			adapter->aq_required |= IAVF_FLAG_AQ_ADD_ADV_RSS_CFG;
@@ -1669,6 +1676,7 @@ iavf_set_adv_rss_hash_opt(struct iavf_adapter *adapter,
 		rss_new->state = IAVF_ADV_RSS_ADD_REQUEST;
 		rss_new->packet_hdrs = hdrs;
 		rss_new->hash_flds = hash_flds;
+		rss_new->symm = symm;
 		list_add_tail(&rss_new->list, &adapter->adv_rss_list_head);
 		adapter->aq_required |= IAVF_FLAG_AQ_ADD_ADV_RSS_CFG;
 	}
@@ -1698,6 +1706,7 @@ iavf_get_adv_rss_hash_opt(struct iavf_adapter *adapter,
 {
 	struct iavf_adv_rss *rss;
 	u64 hash_flds;
+	bool symm;
 	u32 hdrs;
 
 	if (!ADV_RSS_SUPPORT(adapter))
@@ -1711,10 +1720,12 @@ iavf_get_adv_rss_hash_opt(struct iavf_adapter *adapter,
 
 	spin_lock_bh(&adapter->adv_rss_lock);
 	rss = iavf_find_adv_rss_cfg_by_hdrs(adapter, hdrs);
-	if (rss)
+	if (rss) {
 		hash_flds = rss->hash_flds;
-	else
+		symm = rss->symm;
+	} else {
 		hash_flds = IAVF_ADV_RSS_HASH_INVALID;
+	}
 	spin_unlock_bh(&adapter->adv_rss_lock);
 
 	if (hash_flds == IAVF_ADV_RSS_HASH_INVALID)
@@ -1738,6 +1749,9 @@ iavf_get_adv_rss_hash_opt(struct iavf_adapter *adapter,
 			 IAVF_ADV_RSS_HASH_FLD_SCTP_DST_PORT))
 		cmd->data |= (u64)RXH_L4_B_2_3;
 
+	if (symm)
+		cmd->data |= (u64)RXH_SYMMETRIC;
+
 	return 0;
 }
 
-- 
2.34.1