i40e: Flow Director sideband accounting

This patch completes implementation of the ethtool ntuple
rule management interface.  It adds the get, update and delete
interface reset.

Change-ID: Ida7f481d9ee4e405ed91340b858eabb18a52fdb5
Signed-off-by: Joseph Gasparakis <joseph.gasparakis@intel.com>
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Catherine Sullivan <catherine.sullivan@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 189 insertions, 239 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index b1d7d8c5cb9b..8d46c6ee4cdd 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -62,6 +62,9 @@ static const struct i40e_stats i40e_gstrings_net_stats[] = {
 	I40E_NETDEV_STAT(rx_crc_errors),
 };
 
+static int i40e_add_del_fdir_ethtool(struct i40e_vsi *vsi,
+				     struct ethtool_rxnfc *cmd, bool add);
+
 /* These PF_STATs might look like duplicates of some NETDEV_STATs,
  * but they are separate.  This device supports Virtualization, and
  * as such might have several netdevs supporting VMDq and FCoE going
@@ -1112,6 +1115,84 @@ static int i40e_get_rss_hash_opts(struct i40e_pf *pf, struct ethtool_rxnfc *cmd)
 }
 
 /**
+ * i40e_get_ethtool_fdir_all - Populates the rule count of a command
+ * @pf: Pointer to the physical function struct
+ * @cmd: The command to get or set Rx flow classification rules
+ * @rule_locs: Array of used rule locations
+ *
+ * This function populates both the total and actual rule count of
+ * the ethtool flow classification command
+ *
+ * Returns 0 on success or -EMSGSIZE if entry not found
+ **/
+static int i40e_get_ethtool_fdir_all(struct i40e_pf *pf,
+				     struct ethtool_rxnfc *cmd,
+				     u32 *rule_locs)
+{
+	struct i40e_fdir_filter *rule;
+	struct hlist_node *node2;
+	int cnt = 0;
+
+	/* report total rule count */
+	cmd->data = pf->hw.fdir_shared_filter_count +
+		    pf->fdir_pf_filter_count;
+
+	hlist_for_each_entry_safe(rule, node2,
+				  &pf->fdir_filter_list, fdir_node) {
+		if (cnt == cmd->rule_cnt)
+			return -EMSGSIZE;
+
+		rule_locs[cnt] = rule->fd_id;
+		cnt++;
+	}
+
+	cmd->rule_cnt = cnt;
+
+	return 0;
+}
+
+/**
+ * i40e_get_ethtool_fdir_entry - Look up a filter based on Rx flow
+ * @pf: Pointer to the physical function struct
+ * @cmd: The command to get or set Rx flow classification rules
+ *
+ * This function looks up a filter based on the Rx flow classification
+ * command and fills the flow spec info for it if found
+ *
+ * Returns 0 on success or -EINVAL if filter not found
+ **/
+static int i40e_get_ethtool_fdir_entry(struct i40e_pf *pf,
+				       struct ethtool_rxnfc *cmd)
+{
+	struct ethtool_rx_flow_spec *fsp =
+			(struct ethtool_rx_flow_spec *)&cmd->fs;
+	struct i40e_fdir_filter *rule = NULL;
+	struct hlist_node *node2;
+
+	/* report total rule count */
+	cmd->data = pf->hw.fdir_shared_filter_count +
+		    pf->fdir_pf_filter_count;
+
+	hlist_for_each_entry_safe(rule, node2,
+				  &pf->fdir_filter_list, fdir_node) {
+		if (fsp->location <= rule->fd_id)
+			break;
+	}
+
+	if (!rule || fsp->location != rule->fd_id)
+		return -EINVAL;
+
+	fsp->flow_type = rule->flow_type;
+	fsp->h_u.tcp_ip4_spec.psrc = rule->src_port;
+	fsp->h_u.tcp_ip4_spec.pdst = rule->dst_port;
+	fsp->h_u.tcp_ip4_spec.ip4src = rule->src_ip[0];
+	fsp->h_u.tcp_ip4_spec.ip4dst = rule->dst_ip[0];
+	fsp->ring_cookie = rule->q_index;
+
+	return 0;
+}
+
+/**
  * i40e_get_rxnfc - command to get RX flow classification rules
  * @netdev: network interface device structure
  * @cmd: ethtool rxnfc command
@@ -1135,15 +1216,15 @@ static int i40e_get_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd,
 		ret = i40e_get_rss_hash_opts(pf, cmd);
 		break;
 	case ETHTOOL_GRXCLSRLCNT:
-		cmd->rule_cnt = 10;
+		cmd->rule_cnt = pf->fdir_pf_active_filters;
 		ret = 0;
 		break;
 	case ETHTOOL_GRXCLSRULE:
-		ret = 0;
+		ret = i40e_get_ethtool_fdir_entry(pf, cmd);
 		break;
 	case ETHTOOL_GRXCLSRLALL:
-		cmd->data = 500;
-		ret = 0;
+		ret = i40e_get_ethtool_fdir_all(pf, cmd, rule_locs);
+		break;
 	default:
 		break;
 	}
@@ -1274,289 +1355,158 @@ static int i40e_set_rss_hash_opt(struct i40e_pf *pf, struct ethtool_rxnfc *nfc)
 	return 0;
 }
 
-#define IP_HEADER_OFFSET 14
-#define I40E_UDPIP_DUMMY_PACKET_LEN 42
 /**
- * i40e_add_del_fdir_udpv4 - Add/Remove UDPv4 Flow Director filters for
- * a specific flow spec
- * @vsi: pointer to the targeted VSI
- * @fd_data: the flow director data required from the FDir descriptor
- * @ethtool_rx_flow_spec: the flow spec
- * @add: true adds a filter, false removes it
+ * i40e_update_ethtool_fdir_entry - Updates the fdir filter entry
+ * @vsi: Pointer to the targeted VSI
+ * @input: The filter to update or NULL to indicate deletion
+ * @sw_idx: Software index to the filter
+ * @cmd: The command to get or set Rx flow classification rules
  *
- * Returns 0 if the filters were successfully added or removed
+ * This function updates (or deletes) a Flow Director entry from
+ * the hlist of the corresponding PF
+ *
+ * Returns 0 on success
  **/
-static int i40e_add_del_fdir_udpv4(struct i40e_vsi *vsi,
-				   struct i40e_fdir_data *fd_data,
-				   struct ethtool_rx_flow_spec *fsp, bool add)
+static int i40e_update_ethtool_fdir_entry(struct i40e_vsi *vsi,
+					  struct i40e_fdir_filter *input,
+					  u16 sw_idx,
+					  struct ethtool_rxnfc *cmd)
 {
+	struct i40e_fdir_filter *rule, *parent;
 	struct i40e_pf *pf = vsi->back;
-	struct udphdr *udp;
-	struct iphdr *ip;
-	bool err = false;
-	int ret;
-	int i;
-	char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
-			 0x45, 0, 0, 0x1c, 0, 0, 0x40, 0, 0x40, 0x11,
-			 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			 0, 0, 0, 0, 0, 0, 0, 0};
-
-	memcpy(fd_data->raw_packet, packet, I40E_UDPIP_DUMMY_PACKET_LEN);
-
-	ip = (struct iphdr *)(fd_data->raw_packet + IP_HEADER_OFFSET);
-	udp = (struct udphdr *)(fd_data->raw_packet + IP_HEADER_OFFSET
-	      + sizeof(struct iphdr));
+	struct hlist_node *node2;
+	int err = -EINVAL;
 
-	ip->saddr = fsp->h_u.tcp_ip4_spec.ip4src;
-	ip->daddr = fsp->h_u.tcp_ip4_spec.ip4dst;
-	udp->source = fsp->h_u.tcp_ip4_spec.psrc;
-	udp->dest = fsp->h_u.tcp_ip4_spec.pdst;
+	parent = NULL;
+	rule = NULL;
 
-	for (i = I40E_FILTER_PCTYPE_NONF_UNICAST_IPV4_UDP;
-	     i <= I40E_FILTER_PCTYPE_NONF_IPV4_UDP; i++) {
-		fd_data->pctype = i;
-		ret = i40e_program_fdir_filter(fd_data, pf, add);
-
-		if (ret) {
-			dev_info(&pf->pdev->dev,
-				 "Filter command send failed for PCTYPE %d (ret = %d)\n",
-				 fd_data->pctype, ret);
-			err = true;
-		} else {
-			dev_info(&pf->pdev->dev,
-				 "Filter OK for PCTYPE %d (ret = %d)\n",
-				 fd_data->pctype, ret);
-		}
+	hlist_for_each_entry_safe(rule, node2,
+				  &pf->fdir_filter_list, fdir_node) {
+		/* hash found, or no matching entry */
+		if (rule->fd_id >= sw_idx)
+			break;
+		parent = rule;
 	}
 
-	return err ? -EOPNOTSUPP : 0;
-}
-
-#define I40E_TCPIP_DUMMY_PACKET_LEN 54
-/**
- * i40e_add_del_fdir_tcpv4 - Add/Remove TCPv4 Flow Director filters for
- * a specific flow spec
- * @vsi: pointer to the targeted VSI
- * @fd_data: the flow director data required from the FDir descriptor
- * @ethtool_rx_flow_spec: the flow spec
- * @add: true adds a filter, false removes it
- *
- * Returns 0 if the filters were successfully added or removed
- **/
-static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi,
-				   struct i40e_fdir_data *fd_data,
-				   struct ethtool_rx_flow_spec *fsp, bool add)
-{
-	struct i40e_pf *pf = vsi->back;
-	struct tcphdr *tcp;
-	struct iphdr *ip;
-	bool err = false;
-	int ret;
-	/* Dummy packet */
-	char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
-			 0x45, 0, 0, 0x28, 0, 0, 0x40, 0, 0x40, 0x6,
-			 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-			 0x80, 0x11, 0x0, 0x72, 0, 0, 0, 0};
-
-	memcpy(fd_data->raw_packet, packet, I40E_TCPIP_DUMMY_PACKET_LEN);
-
-	ip = (struct iphdr *)(fd_data->raw_packet + IP_HEADER_OFFSET);
-	tcp = (struct tcphdr *)(fd_data->raw_packet + IP_HEADER_OFFSET
-	      + sizeof(struct iphdr));
-
-	ip->daddr = fsp->h_u.tcp_ip4_spec.ip4dst;
-	tcp->dest = fsp->h_u.tcp_ip4_spec.pdst;
-	ip->saddr = fsp->h_u.tcp_ip4_spec.ip4src;
-	tcp->source = fsp->h_u.tcp_ip4_spec.psrc;
-
-	if (add) {
-		if (pf->flags & I40E_FLAG_FD_ATR_ENABLED) {
-			dev_info(&pf->pdev->dev, "Forcing ATR off, sideband rules for TCP/IPv4 flow being applied\n");
-			pf->flags &= ~I40E_FLAG_FD_ATR_ENABLED;
+	/* if there is an old rule occupying our place remove it */
+	if (rule && (rule->fd_id == sw_idx)) {
+		if (!input || (rule->fd_id != input->fd_id)) {
+			cmd->fs.flow_type = rule->flow_type;
+			err = i40e_add_del_fdir_ethtool(vsi, cmd, false);
 		}
+
+		hlist_del(&rule->fdir_node);
+		kfree(rule);
+		pf->fdir_pf_active_filters--;
 	}
 
-	fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_TCP_SYN;
-	ret = i40e_program_fdir_filter(fd_data, pf, add);
+	/* If no input this was a delete, err should be 0 if a rule was
+	 * successfully found and removed from the list else -EINVAL
+	 */
+	if (!input)
+		return err;
 
-	if (ret) {
-		dev_info(&pf->pdev->dev,
-			 "Filter command send failed for PCTYPE %d (ret = %d)\n",
-			 fd_data->pctype, ret);
-		err = true;
-	} else {
-		dev_info(&pf->pdev->dev, "Filter OK for PCTYPE %d (ret = %d)\n",
-			 fd_data->pctype, ret);
-	}
+	/* initialize node and set software index */
+	INIT_HLIST_NODE(&input->fdir_node);
 
-	fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_TCP;
+	/* add filter to the list */
+	if (parent)
+		hlist_add_after(&parent->fdir_node, &input->fdir_node);
+	else
+		hlist_add_head(&input->fdir_node,
+			       &pf->fdir_filter_list);
 
-	ret = i40e_program_fdir_filter(fd_data, pf, add);
-	if (ret) {
-		dev_info(&pf->pdev->dev,
-			 "Filter command send failed for PCTYPE %d (ret = %d)\n",
-			 fd_data->pctype, ret);
-		err = true;
-	} else {
-		dev_info(&pf->pdev->dev, "Filter OK for PCTYPE %d (ret = %d)\n",
-			  fd_data->pctype, ret);
-	}
+	/* update counts */
+	pf->fdir_pf_active_filters++;
 
-	return err ? -EOPNOTSUPP : 0;
+	return 0;
 }
 
 /**
- * i40e_add_del_fdir_sctpv4 - Add/Remove SCTPv4 Flow Director filters for
- * a specific flow spec
- * @vsi: pointer to the targeted VSI
- * @fd_data: the flow director data required from the FDir descriptor
- * @ethtool_rx_flow_spec: the flow spec
- * @add: true adds a filter, false removes it
+ * i40e_del_fdir_entry - Deletes a Flow Director filter entry
+ * @vsi: Pointer to the targeted VSI
+ * @cmd: The command to get or set Rx flow classification rules
  *
- * Returns 0 if the filters were successfully added or removed
- **/
-static int i40e_add_del_fdir_sctpv4(struct i40e_vsi *vsi,
-				    struct i40e_fdir_data *fd_data,
-				    struct ethtool_rx_flow_spec *fsp, bool add)
-{
-	return -EOPNOTSUPP;
-}
-
-#define I40E_IP_DUMMY_PACKET_LEN 34
-/**
- * i40e_add_del_fdir_ipv4 - Add/Remove IPv4 Flow Director filters for
- * a specific flow spec
- * @vsi: pointer to the targeted VSI
- * @fd_data: the flow director data required for the FDir descriptor
- * @fsp: the ethtool flow spec
- * @add: true adds a filter, false removes it
+ * The function removes a Flow Director filter entry from the
+ * hlist of the corresponding PF
  *
- * Returns 0 if the filters were successfully added or removed
- **/
-static int i40e_add_del_fdir_ipv4(struct i40e_vsi *vsi,
-				  struct i40e_fdir_data *fd_data,
-				  struct ethtool_rx_flow_spec *fsp, bool add)
+ * Returns 0 on success
+ */
+static int i40e_del_fdir_entry(struct i40e_vsi *vsi,
+			       struct ethtool_rxnfc *cmd)
 {
+	struct ethtool_rx_flow_spec *fsp =
+		(struct ethtool_rx_flow_spec *)&cmd->fs;
 	struct i40e_pf *pf = vsi->back;
-	struct iphdr *ip;
-	bool err = false;
-	int ret;
-	int i;
-	char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
-			 0x45, 0, 0, 0x14, 0, 0, 0x40, 0, 0x40, 0x10,
-			 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+	int ret = 0;
 
-	memcpy(fd_data->raw_packet, packet, I40E_IP_DUMMY_PACKET_LEN);
-	ip = (struct iphdr *)(fd_data->raw_packet + IP_HEADER_OFFSET);
-
-	ip->saddr = fsp->h_u.usr_ip4_spec.ip4src;
-	ip->daddr = fsp->h_u.usr_ip4_spec.ip4dst;
-	ip->protocol = fsp->h_u.usr_ip4_spec.proto;
-
-	for (i = I40E_FILTER_PCTYPE_NONF_IPV4_OTHER;
-	     i <= I40E_FILTER_PCTYPE_FRAG_IPV4;	i++) {
-		fd_data->pctype = i;
-		ret = i40e_program_fdir_filter(fd_data, pf, add);
-
-		if (ret) {
-			dev_info(&pf->pdev->dev,
-				 "Filter command send failed for PCTYPE %d (ret = %d)\n",
-				 fd_data->pctype, ret);
-			err = true;
-		} else {
-			dev_info(&pf->pdev->dev,
-				 "Filter OK for PCTYPE %d (ret = %d)\n",
-				 fd_data->pctype, ret);
-		}
-	}
+	ret = i40e_update_ethtool_fdir_entry(vsi, NULL, fsp->location, cmd);
 
-	return err ? -EOPNOTSUPP : 0;
+	return ret;
 }
 
 /**
- * i40e_add_del_fdir_ethtool - Add/Remove Flow Director filters for
- * a specific flow spec based on their protocol
+ * i40e_add_del_fdir_ethtool - Add/Remove Flow Director filters
  * @vsi: pointer to the targeted VSI
  * @cmd: command to get or set RX flow classification rules
  * @add: true adds a filter, false removes it
  *
- * Returns 0 if the filters were successfully added or removed
+ * Add/Remove Flow Director filters for a specific flow spec based on their
+ * protocol.  Returns 0 if the filters were successfully added or removed.
  **/
 static int i40e_add_del_fdir_ethtool(struct i40e_vsi *vsi,
-			struct ethtool_rxnfc *cmd, bool add)
+				     struct ethtool_rxnfc *cmd, bool add)
 {
-	struct i40e_fdir_data fd_data;
-	int ret = -EINVAL;
+	struct ethtool_rx_flow_spec *fsp;
+	struct i40e_fdir_filter *input;
 	struct i40e_pf *pf;
-	struct ethtool_rx_flow_spec *fsp =
-		(struct ethtool_rx_flow_spec *)&cmd->fs;
+	int ret = -EINVAL;
 
 	if (!vsi)
 		return -EINVAL;
 
+	fsp = (struct ethtool_rx_flow_spec *)&cmd->fs;
 	pf = vsi->back;
 
-	if ((fsp->ring_cookie != RX_CLS_FLOW_DISC) &&
-	    (fsp->ring_cookie >= vsi->num_queue_pairs))
+	if (fsp->location >= (pf->hw.func_caps.fd_filters_best_effort +
+			      pf->hw.func_caps.fd_filters_guaranteed)) {
 		return -EINVAL;
+	}
 
-	/* Populate the Flow Director that we have at the moment
-	 * and allocate the raw packet buffer for the calling functions
-	 */
-	fd_data.raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_LOOKUP,
-				     GFP_KERNEL);
+	if ((fsp->ring_cookie >= vsi->num_queue_pairs) && add)
+		return -EINVAL;
 
-	if (!fd_data.raw_packet) {
-		dev_info(&pf->pdev->dev, "Could not allocate memory\n");
-		return -ENOMEM;
-	}
+	input = kzalloc(sizeof(*input), GFP_KERNEL);
 
-	fd_data.q_index = fsp->ring_cookie;
-	fd_data.flex_off = 0;
-	fd_data.pctype = 0;
-	fd_data.dest_vsi = vsi->id;
-	fd_data.dest_ctl = I40E_FILTER_PROGRAM_DESC_DEST_DIRECT_PACKET_QINDEX;
-	fd_data.fd_status = I40E_FILTER_PROGRAM_DESC_FD_STATUS_FD_ID;
-	fd_data.cnt_index = 0;
-	fd_data.fd_id = 0;
+	if (!input)
+		return -ENOMEM;
 
-	switch (fsp->flow_type & ~FLOW_EXT) {
-	case TCP_V4_FLOW:
-		ret = i40e_add_del_fdir_tcpv4(vsi, &fd_data, fsp, add);
-		break;
-	case UDP_V4_FLOW:
-		ret = i40e_add_del_fdir_udpv4(vsi, &fd_data, fsp, add);
-		break;
-	case SCTP_V4_FLOW:
-		ret = i40e_add_del_fdir_sctpv4(vsi, &fd_data, fsp, add);
-		break;
-	case IPV4_FLOW:
-		ret = i40e_add_del_fdir_ipv4(vsi, &fd_data, fsp, add);
-		break;
-	case IP_USER_FLOW:
-		switch (fsp->h_u.usr_ip4_spec.proto) {
-		case IPPROTO_TCP:
-			ret = i40e_add_del_fdir_tcpv4(vsi, &fd_data, fsp, add);
-			break;
-		case IPPROTO_UDP:
-			ret = i40e_add_del_fdir_udpv4(vsi, &fd_data, fsp, add);
-			break;
-		case IPPROTO_SCTP:
-			ret = i40e_add_del_fdir_sctpv4(vsi, &fd_data, fsp, add);
-			break;
-		default:
-			ret = i40e_add_del_fdir_ipv4(vsi, &fd_data, fsp, add);
-			break;
-		}
-		break;
-	default:
-		dev_info(&pf->pdev->dev, "Could not specify spec type\n");
-		ret = -EINVAL;
+	input->fd_id = fsp->location;
+
+	input->q_index = fsp->ring_cookie;
+	input->flex_off = 0;
+	input->pctype = 0;
+	input->dest_vsi = vsi->id;
+	input->dest_ctl = I40E_FILTER_PROGRAM_DESC_DEST_DIRECT_PACKET_QINDEX;
+	input->fd_status = I40E_FILTER_PROGRAM_DESC_FD_STATUS_FD_ID;
+	input->cnt_index = 0;
+	input->flow_type = fsp->flow_type;
+	input->ip4_proto = fsp->h_u.usr_ip4_spec.proto;
+	input->src_port = fsp->h_u.tcp_ip4_spec.psrc;
+	input->dst_port = fsp->h_u.tcp_ip4_spec.pdst;
+	input->src_ip[0] = fsp->h_u.tcp_ip4_spec.ip4src;
+	input->dst_ip[0] = fsp->h_u.tcp_ip4_spec.ip4dst;
+
+	ret = i40e_add_del_fdir(vsi, input, add);
+	if (ret) {
+		kfree(input);
+		return ret;
 	}
 
-	kfree(fd_data.raw_packet);
-	fd_data.raw_packet = NULL;
+	if (!ret && add)
+		i40e_update_ethtool_fdir_entry(vsi, input, fsp->location, NULL);
+	else
+		kfree(input);
 
 	return ret;
 }
@@ -1583,7 +1533,7 @@ static int i40e_set_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd)
 		ret = i40e_add_del_fdir_ethtool(vsi, cmd, true);
 		break;
 	case ETHTOOL_SRXCLSRLDEL:
-		ret = i40e_add_del_fdir_ethtool(vsi, cmd, false);
+		ret = i40e_del_fdir_entry(vsi, cmd);
 		break;
 	default:
 		break;