ice: Implement ethtool ops for channels

Add code to query and set the number of channels on the primary VSI for a
PF. This is accessed from the 'ethtool -l' and 'ethtool -L' commands,
respectively.  Though the ice driver supports asymmetric queues report an
IRQ vector that has both Rx and Tx queues attached and is counted as a
'combined' channel.

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

drivers/net/ethernet/intel/ice/ice.h

@@ -285,6 +285,8 @@ struct ice_vsi {
 	u16 num_txq;			 /* Used Tx queues */
 	u16 alloc_rxq;			 /* Allocated Rx queues */
 	u16 num_rxq;			 /* Used Rx queues */
+	u16 req_txq;			 /* User requested Tx queues */
+	u16 req_rxq;			 /* User requested Rx queues */
 	u16 num_rx_desc;
 	u16 num_tx_desc;
 	struct ice_tc_cfg tc_cfg;
@@ -491,6 +493,7 @@ void ice_set_ethtool_ops(struct net_device *netdev);
 void ice_set_ethtool_safe_mode_ops(struct net_device *netdev);
 u16 ice_get_avail_txq_count(struct ice_pf *pf);
 u16 ice_get_avail_rxq_count(struct ice_pf *pf);
+int ice_vsi_recfg_qs(struct ice_vsi *vsi, int new_rx, int new_tx);
 void ice_update_vsi_stats(struct ice_vsi *vsi);
 void ice_update_pf_stats(struct ice_pf *pf);
 int ice_up(struct ice_vsi *vsi);
@@ -505,6 +508,7 @@ ice_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 int ice_set_rss(struct ice_vsi *vsi, u8 *seed, u8 *lut, u16 lut_size);
 int ice_get_rss(struct ice_vsi *vsi, u8 *seed, u8 *lut, u16 lut_size);
 void ice_fill_rss_lut(u8 *lut, u16 rss_table_size, u16 rss_size);
+int ice_schedule_reset(struct ice_pf *pf, enum ice_reset_req reset);
 void ice_print_link_msg(struct ice_vsi *vsi, bool isup);
 int ice_open(struct net_device *netdev);
 int ice_stop(struct net_device *netdev);

drivers/net/ethernet/intel/ice/ice_dcb_lib.c

@@ -4,8 +4,6 @@
 #include "ice_dcb_lib.h"
 #include "ice_dcb_nl.h"
 
-static void ice_pf_dcb_recfg(struct ice_pf *pf);
-
 /**
  * ice_vsi_cfg_netdev_tc - Setup the netdev TC configuration
  * @vsi: the VSI being configured
@@ -535,7 +533,7 @@ static int ice_dcb_noncontig_cfg(struct ice_pf *pf)
  * calling this function. Reconfiguring DCB based on
  * local_dcbx_cfg.
  */
-static void ice_pf_dcb_recfg(struct ice_pf *pf)
+void ice_pf_dcb_recfg(struct ice_pf *pf)
 {
 	struct ice_dcbx_cfg *dcbcfg = &pf->hw.port_info->local_dcbx_cfg;
 	u8 tc_map = 0;

drivers/net/ethernet/intel/ice/ice_dcb_lib.h

@@ -20,6 +20,7 @@ u8 ice_dcb_get_num_tc(struct ice_dcbx_cfg *dcbcfg);
 u8 ice_dcb_get_tc(struct ice_vsi *vsi, int queue_index);
 int
 ice_pf_dcb_cfg(struct ice_pf *pf, struct ice_dcbx_cfg *new_cfg, bool locked);
+void ice_pf_dcb_recfg(struct ice_pf *pf);
 void ice_vsi_cfg_dcb_rings(struct ice_vsi *vsi);
 int ice_init_pf_dcb(struct ice_pf *pf, bool locked);
 void ice_update_dcb_stats(struct ice_pf *pf);
@@ -78,6 +79,7 @@ ice_tx_prepare_vlan_flags_dcb(struct ice_ring __always_unused *tx_ring,
 }
 
 #define ice_update_dcb_stats(pf) do {} while (0)
+#define ice_pf_dcb_recfg(pf) do {} while (0)
 #define ice_vsi_cfg_dcb_rings(vsi) do {} while (0)
 #define ice_dcb_process_lldp_set_mib_change(pf, event) do {} while (0)
 #define ice_set_cgd_num(tlan_ctx, ring) do {} while (0)

drivers/net/ethernet/intel/ice/ice_ethtool.c

@@ -3142,6 +3142,188 @@ ice_set_rxfh(struct net_device *netdev, const u32 *indir, const u8 *key,
 	return 0;
 }
 
+/**
+ * ice_get_max_txq - return the maximum number of Tx queues for in a PF
+ * @pf: PF structure
+ */
+static int ice_get_max_txq(struct ice_pf *pf)
+{
+	return min_t(int, num_online_cpus(),
+		     pf->hw.func_caps.common_cap.num_txq);
+}
+
+/**
+ * ice_get_max_rxq - return the maximum number of Rx queues for in a PF
+ * @pf: PF structure
+ */
+static int ice_get_max_rxq(struct ice_pf *pf)
+{
+	return min_t(int, num_online_cpus(),
+		     pf->hw.func_caps.common_cap.num_rxq);
+}
+
+/**
+ * ice_get_combined_cnt - return the current number of combined channels
+ * @vsi: PF VSI pointer
+ *
+ * Go through all queue vectors and count ones that have both Rx and Tx ring
+ * attached
+ */
+static u32 ice_get_combined_cnt(struct ice_vsi *vsi)
+{
+	u32 combined = 0;
+	int q_idx;
+
+	ice_for_each_q_vector(vsi, q_idx) {
+		struct ice_q_vector *q_vector = vsi->q_vectors[q_idx];
+
+		if (q_vector->rx.ring && q_vector->tx.ring)
+			combined++;
+	}
+
+	return combined;
+}
+
+/**
+ * ice_get_channels - get the current and max supported channels
+ * @dev: network interface device structure
+ * @ch: ethtool channel data structure
+ */
+static void
+ice_get_channels(struct net_device *dev, struct ethtool_channels *ch)
+{
+	struct ice_netdev_priv *np = netdev_priv(dev);
+	struct ice_vsi *vsi = np->vsi;
+	struct ice_pf *pf = vsi->back;
+
+	/* check to see if VSI is active */
+	if (test_bit(__ICE_DOWN, vsi->state))
+		return;
+
+	/* report maximum channels */
+	ch->max_rx = ice_get_max_rxq(pf);
+	ch->max_tx = ice_get_max_txq(pf);
+	ch->max_combined = min_t(int, ch->max_rx, ch->max_tx);
+
+	/* report current channels */
+	ch->combined_count = ice_get_combined_cnt(vsi);
+	ch->rx_count = vsi->num_rxq - ch->combined_count;
+	ch->tx_count = vsi->num_txq - ch->combined_count;
+}
+
+/**
+ * ice_vsi_set_dflt_rss_lut - set default RSS LUT with requested RSS size
+ * @vsi: VSI to reconfigure RSS LUT on
+ * @req_rss_size: requested range of queue numbers for hashing
+ *
+ * Set the VSI's RSS parameters, configure the RSS LUT based on these.
+ */
+static int ice_vsi_set_dflt_rss_lut(struct ice_vsi *vsi, int req_rss_size)
+{
+	struct ice_pf *pf = vsi->back;
+	enum ice_status status;
+	struct device *dev;
+	struct ice_hw *hw;
+	int err = 0;
+	u8 *lut;
+
+	dev = ice_pf_to_dev(pf);
+	hw = &pf->hw;
+
+	if (!req_rss_size)
+		return -EINVAL;
+
+	lut = kzalloc(vsi->rss_table_size, GFP_KERNEL);
+	if (!lut)
+		return -ENOMEM;
+
+	/* set RSS LUT parameters */
+	if (!test_bit(ICE_FLAG_RSS_ENA, pf->flags)) {
+		vsi->rss_size = 1;
+	} else {
+		struct ice_hw_common_caps *caps = &hw->func_caps.common_cap;
+
+		vsi->rss_size = min_t(int, req_rss_size,
+				      BIT(caps->rss_table_entry_width));
+	}
+
+	/* create/set RSS LUT */
+	ice_fill_rss_lut(lut, vsi->rss_table_size, vsi->rss_size);
+	status = ice_aq_set_rss_lut(hw, vsi->idx, vsi->rss_lut_type, lut,
+				    vsi->rss_table_size);
+	if (status) {
+		dev_err(dev, "Cannot set RSS lut, err %d aq_err %d\n",
+			status, hw->adminq.rq_last_status);
+		err = -EIO;
+	}
+
+	kfree(lut);
+	return err;
+}
+
+/**
+ * ice_set_channels - set the number channels
+ * @dev: network interface device structure
+ * @ch: ethtool channel data structure
+ */
+static int ice_set_channels(struct net_device *dev, struct ethtool_channels *ch)
+{
+	struct ice_netdev_priv *np = netdev_priv(dev);
+	struct ice_vsi *vsi = np->vsi;
+	struct ice_pf *pf = vsi->back;
+	int new_rx = 0, new_tx = 0;
+	u32 curr_combined;
+
+	/* do not support changing channels in Safe Mode */
+	if (ice_is_safe_mode(pf)) {
+		netdev_err(dev, "Changing channel in Safe Mode is not supported\n");
+		return -EOPNOTSUPP;
+	}
+	/* do not support changing other_count */
+	if (ch->other_count)
+		return -EINVAL;
+
+	curr_combined = ice_get_combined_cnt(vsi);
+
+	/* these checks are for cases where user didn't specify a particular
+	 * value on cmd line but we get non-zero value anyway via
+	 * get_channels(); look at ethtool.c in ethtool repository (the user
+	 * space part), particularly, do_schannels() routine
+	 */
+	if (ch->rx_count == vsi->num_rxq - curr_combined)
+		ch->rx_count = 0;
+	if (ch->tx_count == vsi->num_txq - curr_combined)
+		ch->tx_count = 0;
+	if (ch->combined_count == curr_combined)
+		ch->combined_count = 0;
+
+	if (!(ch->combined_count || (ch->rx_count && ch->tx_count))) {
+		netdev_err(dev, "Please specify at least 1 Rx and 1 Tx channel\n");
+		return -EINVAL;
+	}
+
+	new_rx = ch->combined_count + ch->rx_count;
+	new_tx = ch->combined_count + ch->tx_count;
+
+	if (new_rx > ice_get_max_rxq(pf)) {
+		netdev_err(dev, "Maximum allowed Rx channels is %d\n",
+			   ice_get_max_rxq(pf));
+		return -EINVAL;
+	}
+	if (new_tx > ice_get_max_txq(pf)) {
+		netdev_err(dev, "Maximum allowed Tx channels is %d\n",
+			   ice_get_max_txq(pf));
+		return -EINVAL;
+	}
+
+	ice_vsi_recfg_qs(vsi, new_rx, new_tx);
+
+	if (new_rx && !netif_is_rxfh_configured(dev))
+		return ice_vsi_set_dflt_rss_lut(vsi, new_rx);
+
+	return 0;
+}
+
 enum ice_container_type {
 	ICE_RX_CONTAINER,
 	ICE_TX_CONTAINER,
@@ -3631,6 +3813,8 @@ static const struct ethtool_ops ice_ethtool_ops = {
 	.get_rxfh_indir_size	= ice_get_rxfh_indir_size,
 	.get_rxfh		= ice_get_rxfh,
 	.set_rxfh		= ice_set_rxfh,
+	.get_channels		= ice_get_channels,
+	.set_channels		= ice_set_channels,
 	.get_ts_info		= ethtool_op_get_ts_info,
 	.get_per_queue_coalesce = ice_get_per_q_coalesce,
 	.set_per_queue_coalesce = ice_set_per_q_coalesce,
@@ -3656,6 +3840,7 @@ static const struct ethtool_ops ice_ethtool_safe_mode_ops = {
 	.get_ringparam		= ice_get_ringparam,
 	.set_ringparam		= ice_set_ringparam,
 	.nway_reset		= ice_nway_reset,
+	.get_channels		= ice_get_channels,
 };
 
 /**

drivers/net/ethernet/intel/ice/ice_lib.c

@@ -142,15 +142,24 @@ static void ice_vsi_set_num_qs(struct ice_vsi *vsi, u16 vf_id)
 	case ICE_VSI_PF:
 		vsi->alloc_txq = min_t(int, ice_get_avail_txq_count(pf),
 				       num_online_cpus());
+		if (vsi->req_txq) {
+			vsi->alloc_txq = vsi->req_txq;
+			vsi->num_txq = vsi->req_txq;
+		}
 
 		pf->num_lan_tx = vsi->alloc_txq;
 
 		/* only 1 Rx queue unless RSS is enabled */
-		if (!test_bit(ICE_FLAG_RSS_ENA, pf->flags))
+		if (!test_bit(ICE_FLAG_RSS_ENA, pf->flags)) {
 			vsi->alloc_rxq = 1;
-		else
+		} else {
 			vsi->alloc_rxq = min_t(int, ice_get_avail_rxq_count(pf),
 					       num_online_cpus());
+			if (vsi->req_rxq) {
+				vsi->alloc_rxq = vsi->req_rxq;
+				vsi->num_rxq = vsi->req_rxq;
+			}
+		}
 
 		pf->num_lan_rx = vsi->alloc_rxq;
 
@@ -639,7 +648,9 @@ static void ice_vsi_setup_q_map(struct ice_vsi *vsi, struct ice_vsi_ctx *ctxt)
 			else
 				max_rss = ICE_MAX_SMALL_RSS_QS;
 			qcount_rx = min_t(int, rx_numq_tc, max_rss);
-			qcount_rx = min_t(int, qcount_rx, vsi->rss_size);
+			if (!vsi->req_rxq)
+				qcount_rx = min_t(int, qcount_rx,
+						  vsi->rss_size);
 		}
 	}
 
@@ -746,17 +757,20 @@ static void ice_set_rss_vsi_ctx(struct ice_vsi_ctx *ctxt, struct ice_vsi *vsi)
 /**
  * ice_vsi_init - Create and initialize a VSI
  * @vsi: the VSI being configured
+ * @init_vsi: is this call creating a VSI
  *
  * This initializes a VSI context depending on the VSI type to be added and
  * passes it down to the add_vsi aq command to create a new VSI.
  */
-static int ice_vsi_init(struct ice_vsi *vsi)
+static int ice_vsi_init(struct ice_vsi *vsi, bool init_vsi)
 {
 	struct ice_pf *pf = vsi->back;
 	struct ice_hw *hw = &pf->hw;
 	struct ice_vsi_ctx *ctxt;
+	struct device *dev;
 	int ret = 0;
 
+	dev = ice_pf_to_dev(pf);
 	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
 	if (!ctxt)
 		return -ENOMEM;
@@ -784,11 +798,24 @@ static int ice_vsi_init(struct ice_vsi *vsi)
 		ctxt->info.sw_flags |= ICE_AQ_VSI_SW_FLAG_ALLOW_LB;
 
 	/* Set LUT type and HASH type if RSS is enabled */
-	if (test_bit(ICE_FLAG_RSS_ENA, pf->flags))
+	if (test_bit(ICE_FLAG_RSS_ENA, pf->flags)) {
 		ice_set_rss_vsi_ctx(ctxt, vsi);
+		/* if updating VSI context, make sure to set valid_section:
+		 * to indicate which section of VSI context being updated
+		 */
+		if (!init_vsi)
+			ctxt->info.valid_sections |=
+				cpu_to_le16(ICE_AQ_VSI_PROP_Q_OPT_VALID);
+	}
 
 	ctxt->info.sw_id = vsi->port_info->sw_id;
 	ice_vsi_setup_q_map(vsi, ctxt);
+	if (!init_vsi) /* means VSI being updated */
+		/* must to indicate which section of VSI context are
+		 * being modified
+		 */
+		ctxt->info.valid_sections |=
+			cpu_to_le16(ICE_AQ_VSI_PROP_RXQ_MAP_VALID);
 
 	/* Enable MAC Antispoof with new VSI being initialized or updated */
 	if (vsi->type == ICE_VSI_VF && pf->vf[vsi->vf_id].spoofchk) {
@@ -805,11 +832,20 @@ static int ice_vsi_init(struct ice_vsi *vsi)
 			cpu_to_le16(ICE_AQ_VSI_PROP_SECURITY_VALID);
 	}
 
-	ret = ice_add_vsi(hw, vsi->idx, ctxt, NULL);
-	if (ret) {
-		dev_err(ice_pf_to_dev(pf), "Add VSI failed, err %d\n", ret);
-		ret = -EIO;
-		goto out;
+	if (init_vsi) {
+		ret = ice_add_vsi(hw, vsi->idx, ctxt, NULL);
+		if (ret) {
+			dev_err(dev, "Add VSI failed, err %d\n", ret);
+			ret = -EIO;
+			goto out;
+		}
+	} else {
+		ret = ice_update_vsi(hw, vsi->idx, ctxt, NULL);
+		if (ret) {
+			dev_err(dev, "Update VSI failed, err %d\n", ret);
+			ret = -EIO;
+			goto out;
+		}
 	}
 
 	/* keep context for update VSI operations */
@@ -1835,7 +1871,7 @@ ice_vsi_setup(struct ice_pf *pf, struct ice_port_info *pi,
 	ice_vsi_set_tc_cfg(vsi);
 
 	/* create the VSI */
-	ret = ice_vsi_init(vsi);
+	ret = ice_vsi_init(vsi, true);
 	if (ret)
 		goto unroll_get_qs;
 
@@ -2368,10 +2404,11 @@ int ice_vsi_release(struct ice_vsi *vsi)
 /**
  * ice_vsi_rebuild - Rebuild VSI after reset
  * @vsi: VSI to be rebuild
+ * @init_vsi: is this an initialization or a reconfigure of the VSI
  *
  * Returns 0 on success and negative value on failure
  */
-int ice_vsi_rebuild(struct ice_vsi *vsi)
+int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi)
 {
 	u16 max_txqs[ICE_MAX_TRAFFIC_CLASS] = { 0 };
 	struct ice_vf *vf = NULL;
@@ -2423,7 +2460,7 @@ int ice_vsi_rebuild(struct ice_vsi *vsi)
 	ice_vsi_set_tc_cfg(vsi);
 
 	/* Initialize VSI struct elements and create VSI in FW */
-	ret = ice_vsi_init(vsi);
+	ret = ice_vsi_init(vsi, init_vsi);
 	if (ret < 0)
 		goto err_vsi;
 
@@ -2491,7 +2528,12 @@ int ice_vsi_rebuild(struct ice_vsi *vsi)
 		dev_err(ice_pf_to_dev(pf),
 			"VSI %d failed lan queue config, error %d\n",
 			vsi->vsi_num, status);
-		goto err_vectors;
+		if (init_vsi) {
+			ret = -EIO;
+			goto err_vectors;
+		} else {
+			return ice_schedule_reset(pf, ICE_RESET_PFR);
+		}
 	}
 	return 0;
 

drivers/net/ethernet/intel/ice/ice_lib.h

@@ -73,7 +73,7 @@ int ice_free_res(struct ice_res_tracker *res, u16 index, u16 id);
 int
 ice_get_res(struct ice_pf *pf, struct ice_res_tracker *res, u16 needed, u16 id);
 
-int ice_vsi_rebuild(struct ice_vsi *vsi);
+int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi);
 
 bool ice_is_reset_in_progress(unsigned long *state);
 

drivers/net/ethernet/intel/ice/ice_main.c

@@ -44,6 +44,7 @@ MODULE_PARM_DESC(debug, "netif level (0=none,...,16=all)");
 static struct workqueue_struct *ice_wq;
 static const struct net_device_ops ice_netdev_safe_mode_ops;
 static const struct net_device_ops ice_netdev_ops;
+static int ice_vsi_open(struct ice_vsi *vsi);
 
 static void ice_rebuild(struct ice_pf *pf, enum ice_reset_req reset_type);
 
@@ -1524,6 +1525,44 @@ static void ice_set_ctrlq_len(struct ice_hw *hw)
 	hw->mailboxq.sq_buf_size = ICE_MBXQ_MAX_BUF_LEN;
 }
 
+/**
+ * ice_schedule_reset - schedule a reset
+ * @pf: board private structure
+ * @reset: reset being requested
+ */
+int ice_schedule_reset(struct ice_pf *pf, enum ice_reset_req reset)
+{
+	struct device *dev = ice_pf_to_dev(pf);
+
+	/* bail out if earlier reset has failed */
+	if (test_bit(__ICE_RESET_FAILED, pf->state)) {
+		dev_dbg(dev, "earlier reset has failed\n");
+		return -EIO;
+	}
+	/* bail if reset/recovery already in progress */
+	if (ice_is_reset_in_progress(pf->state)) {
+		dev_dbg(dev, "Reset already in progress\n");
+		return -EBUSY;
+	}
+
+	switch (reset) {
+	case ICE_RESET_PFR:
+		set_bit(__ICE_PFR_REQ, pf->state);
+		break;
+	case ICE_RESET_CORER:
+		set_bit(__ICE_CORER_REQ, pf->state);
+		break;
+	case ICE_RESET_GLOBR:
+		set_bit(__ICE_GLOBR_REQ, pf->state);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ice_service_task_schedule(pf);
+	return 0;
+}
+
 /**
  * ice_irq_affinity_notify - Callback for affinity changes
  * @notify: context as to what irq was changed
@@ -2808,6 +2847,52 @@ static int ice_init_interrupt_scheme(struct ice_pf *pf)
 	return 0;
 }
 
+/**
+ * ice_vsi_recfg_qs - Change the number of queues on a VSI
+ * @vsi: VSI being changed
+ * @new_rx: new number of Rx queues
+ * @new_tx: new number of Tx queues
+ *
+ * Only change the number of queues if new_tx, or new_rx is non-0.
+ *
+ * Returns 0 on success.
+ */
+int ice_vsi_recfg_qs(struct ice_vsi *vsi, int new_rx, int new_tx)
+{
+	struct ice_pf *pf = vsi->back;
+	int err = 0, timeout = 50;
+
+	if (!new_rx && !new_tx)
+		return -EINVAL;
+
+	while (test_and_set_bit(__ICE_CFG_BUSY, pf->state)) {
+		timeout--;
+		if (!timeout)
+			return -EBUSY;
+		usleep_range(1000, 2000);
+	}
+
+	if (new_tx)
+		vsi->req_txq = new_tx;
+	if (new_rx)
+		vsi->req_rxq = new_rx;
+
+	/* set for the next time the netdev is started */
+	if (!netif_running(vsi->netdev)) {
+		ice_vsi_rebuild(vsi, false);
+		dev_dbg(ice_pf_to_dev(pf), "Link is down, queue count change happens when link is brought up\n");
+		goto done;
+	}
+
+	ice_vsi_close(vsi);
+	ice_vsi_rebuild(vsi, false);
+	ice_pf_dcb_recfg(pf);
+	ice_vsi_open(vsi);
+done:
+	clear_bit(__ICE_CFG_BUSY, pf->state);
+	return err;
+}
+
 /**
  * ice_log_pkg_init - log result of DDP package load
  * @hw: pointer to hardware info
@@ -4482,7 +4567,7 @@ static int ice_vsi_rebuild_by_type(struct ice_pf *pf, enum ice_vsi_type type)
 			continue;
 
 		/* rebuild the VSI */
-		err = ice_vsi_rebuild(vsi);
+		err = ice_vsi_rebuild(vsi, true);
 		if (err) {
 			dev_err(dev,
 				"rebuild VSI failed, err %d, VSI index %d, type %s\n",