[Intel-wired-lan] [net-next, v2 0/2] ice: Accumulate statistics over reset

[Intel-wired-lan] [net-next, v2 0/2] ice: Accumulate statistics over reset

[Benjamin Mikailenko]

Resets happen with or without user interaction. For example, incidents
such as TX hang or a reconfiguration of parameters will result in a reset.
During reset, hardware and software statistics were set to zero. This
created an issue for the user where a reset happens in the background,
statistics set to zero, and the user checks statistics expecting them to
be populated.

Accumulate statistics over reset so the above doesn't happen.

Change is divided in two patches:
1. Accumulate HW and netdev statistics over reset
2. Accumulate ring statistics over reset

Benjamin Mikailenko (2):
  ice: Accumulate HW and Netdev statistics over reset
  ice: Accumulate ring statistics over reset

 drivers/net/ethernet/intel/ice/ice.h          |   7 +
 drivers/net/ethernet/intel/ice/ice_dcb_lib.c  |   3 +
 drivers/net/ethernet/intel/ice/ice_ethtool.c  |  12 +-
 drivers/net/ethernet/intel/ice/ice_lib.c      | 263 +++++++++++++++++-
 drivers/net/ethernet/intel/ice/ice_main.c     |  78 ++++--
 drivers/net/ethernet/intel/ice/ice_repr.c     |  10 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c     |  40 ++-
 drivers/net/ethernet/intel/ice/ice_txrx.h     |  18 +-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c |   2 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c      |  25 +-
 10 files changed, 396 insertions(+), 62 deletions(-)

-- 
2.34.3

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[Intel-wired-lan] [net-next, v2 1/2] ice: Accumulate HW and Netdev statistics over reset

[Benjamin Mikailenko]

Resets happen with or without user interaction. For example, incidents
such as TX hang or a reconfiguration of parameters will result in a reset.
During reset, hardware and software statistics were set to zero. This
created an issue for the user where a reset happens in the background,
statistics set to zero, and the user checks statistics expecting them to
be populated.

To ensure this doesn't happen, keep accumulating stats over reset.

1. Remove function calls which reset hardware and netdev statistics.
2. Do not rollover statistics in ice_stat_update40 during reset.

Signed-off-by: Benjamin Mikailenko <benjamin.mikailenko@intel.com>
---
 drivers/net/ethernet/intel/ice/ice.h         |  1 +
 drivers/net/ethernet/intel/ice/ice_dcb_lib.c |  3 ++
 drivers/net/ethernet/intel/ice/ice_lib.c     |  7 +++++
 drivers/net/ethernet/intel/ice/ice_main.c    | 30 +++++++++++++++++---
 4 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 001500afc4a6..e0ed2f1cc434 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -358,6 +358,7 @@ struct ice_vsi {
 
 	/* VSI stats */
 	struct rtnl_link_stats64 net_stats;
+	struct rtnl_link_stats64 net_stats_prev;
 	struct ice_eth_stats eth_stats;
 	struct ice_eth_stats eth_stats_prev;
 
diff --git a/drivers/net/ethernet/intel/ice/ice_dcb_lib.c b/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
index 5e6d168bac48..4f3a848f4e99 100644
--- a/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
@@ -874,6 +874,9 @@ void ice_update_dcb_stats(struct ice_pf *pf)
 	prev_ps = &pf->stats_prev;
 	cur_ps = &pf->stats;
 
+	if (ice_is_reset_in_progress(pf->state))
+		pf->stat_prev_loaded = false;
+
 	for (i = 0; i < 8; i++) {
 		ice_stat_update32(hw, GLPRT_PXOFFRXC(port, i),
 				  pf->stat_prev_loaded,
diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index 938ba8c215cb..a5945319b62e 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -1795,11 +1795,15 @@ void ice_update_eth_stats(struct ice_vsi *vsi)
 {
 	struct ice_eth_stats *prev_es, *cur_es;
 	struct ice_hw *hw = &vsi->back->hw;
+	struct ice_pf *pf = vsi->back;
 	u16 vsi_num = vsi->vsi_num;    /* HW absolute index of a VSI */
 
 	prev_es = &vsi->eth_stats_prev;
 	cur_es = &vsi->eth_stats;
 
+	if (ice_is_reset_in_progress(pf->state))
+		vsi->stat_offsets_loaded = false;
+
 	ice_stat_update40(hw, GLV_GORCL(vsi_num), vsi->stat_offsets_loaded,
 			  &prev_es->rx_bytes, &cur_es->rx_bytes);
 
@@ -3279,6 +3283,8 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi)
 			goto err_vectors;
 
 		ice_vsi_map_rings_to_vectors(vsi);
+
+		vsi->stat_offsets_loaded = false;
 		if (ice_is_xdp_ena_vsi(vsi)) {
 			ret = ice_vsi_determine_xdp_res(vsi);
 			if (ret)
@@ -3315,6 +3321,7 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi)
 		if (ret)
 			goto err_vectors;
 
+		vsi->stat_offsets_loaded = false;
 		break;
 	case ICE_VSI_CHNL:
 		if (test_bit(ICE_FLAG_RSS_ENA, pf->flags)) {
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 189160dacad9..ac893ce39e5e 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -6487,6 +6487,7 @@ ice_update_vsi_tx_ring_stats(struct ice_vsi *vsi,
  */
 static void ice_update_vsi_ring_stats(struct ice_vsi *vsi)
 {
+	struct rtnl_link_stats64 *net_stats, *stats_prev;
 	struct rtnl_link_stats64 *vsi_stats;
 	u64 pkts, bytes;
 	int i;
@@ -6526,10 +6527,28 @@ static void ice_update_vsi_ring_stats(struct ice_vsi *vsi)
 
 	rcu_read_unlock();
 
-	vsi->net_stats.tx_packets = vsi_stats->tx_packets;
-	vsi->net_stats.tx_bytes = vsi_stats->tx_bytes;
-	vsi->net_stats.rx_packets = vsi_stats->rx_packets;
-	vsi->net_stats.rx_bytes = vsi_stats->rx_bytes;
+	net_stats = &vsi->net_stats;
+	stats_prev = &vsi->net_stats_prev;
+
+	/* clear prev counters after reset */
+	if (vsi_stats->tx_packets < stats_prev->tx_packets ||
+	    vsi_stats->rx_packets < stats_prev->rx_packets) {
+		stats_prev->tx_packets = 0;
+		stats_prev->tx_bytes = 0;
+		stats_prev->rx_packets = 0;
+		stats_prev->rx_bytes = 0;
+	}
+
+	/* update netdev counters */
+	net_stats->tx_packets += vsi_stats->tx_packets - stats_prev->tx_packets;
+	net_stats->tx_bytes += vsi_stats->tx_bytes - stats_prev->tx_bytes;
+	net_stats->rx_packets += vsi_stats->rx_packets - stats_prev->rx_packets;
+	net_stats->rx_bytes += vsi_stats->rx_bytes - stats_prev->rx_bytes;
+
+	stats_prev->tx_packets = vsi_stats->tx_packets;
+	stats_prev->tx_bytes = vsi_stats->tx_bytes;
+	stats_prev->rx_packets = vsi_stats->rx_packets;
+	stats_prev->rx_bytes = vsi_stats->rx_bytes;
 
 	kfree(vsi_stats);
 }
@@ -6591,6 +6610,9 @@ void ice_update_pf_stats(struct ice_pf *pf)
 	prev_ps = &pf->stats_prev;
 	cur_ps = &pf->stats;
 
+	if (ice_is_reset_in_progress(pf->state))
+		pf->stat_prev_loaded = false;
+
 	ice_stat_update40(hw, GLPRT_GORCL(port), pf->stat_prev_loaded,
 			  &prev_ps->eth.rx_bytes,
 			  &cur_ps->eth.rx_bytes);
-- 
2.34.3

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[Intel-wired-lan] [net-next, v2 2/2] ice: Accumulate ring statistics over reset

[Benjamin Mikailenko]

Resets may occur with or without user interaction. For example, a TX hang
or reconfiguration of parameters will result in a reset. During reset, the
VSI is freed, freeing any statistics structures inside as well. This would
create an issue for the user where a reset happens in the background,
statistics set to zero, and the user checks ring statistics expecting them
to be populated.

To ensure this doesn't happen, accumulate ring statistics over reset.

Define a new ring statistics structure, ice_ring_stats. The new structure
lives in the VSI's parent, preserving ring statistics when VSI is freed.

1. Define a new structure vsi_ring_stats in the PF scope
2. Allocate/free stats only during probe, unload, or change in ring size
3. Replace previous ring statistics functionality with new structure

Signed-off-by: Benjamin Mikailenko <benjamin.mikailenko@intel.com>
---
 drivers/net/ethernet/intel/ice/ice.h          |   6 +
 drivers/net/ethernet/intel/ice/ice_ethtool.c  |  12 +-
 drivers/net/ethernet/intel/ice/ice_lib.c      | 256 +++++++++++++++++-
 drivers/net/ethernet/intel/ice/ice_main.c     |  48 +++-
 drivers/net/ethernet/intel/ice/ice_repr.c     |  10 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c     |  40 ++-
 drivers/net/ethernet/intel/ice/ice_txrx.h     |  18 +-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c |   2 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c      |  25 +-
 9 files changed, 359 insertions(+), 58 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index e0ed2f1cc434..cdc4e9f97ba0 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -305,6 +305,11 @@ enum ice_vsi_state {
 	ICE_VSI_STATE_NBITS		/* must be last */
 };
 
+struct ice_vsi_stats {
+	struct ice_ring_stats **tx_ring_stats;  /* Tx ring stats array */
+	struct ice_ring_stats **rx_ring_stats;  /* Rx ring stats array */
+};
+
 /* struct that defines a VSI, associated with a dev */
 struct ice_vsi {
 	struct net_device *netdev;
@@ -526,6 +531,7 @@ struct ice_pf {
 	u16 ctrl_vsi_idx;		/* control VSI index in pf->vsi array */
 
 	struct ice_vsi **vsi;		/* VSIs created by the driver */
+	struct ice_vsi_stats **vsi_stats;
 	struct ice_sw *first_sw;	/* first switch created by firmware */
 	u16 eswitch_mode;		/* current mode of eswitch */
 	struct ice_vfs vfs;
diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index b7be84bbe72d..6c2ad100c3f7 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -1375,9 +1375,9 @@ __ice_get_ethtool_stats(struct net_device *netdev,
 
 	ice_for_each_alloc_txq(vsi, j) {
 		tx_ring = READ_ONCE(vsi->tx_rings[j]);
-		if (tx_ring) {
-			data[i++] = tx_ring->stats.pkts;
-			data[i++] = tx_ring->stats.bytes;
+		if (tx_ring && tx_ring->ring_stats) {
+			data[i++] = tx_ring->ring_stats->stats.pkts;
+			data[i++] = tx_ring->ring_stats->stats.bytes;
 		} else {
 			data[i++] = 0;
 			data[i++] = 0;
@@ -1386,9 +1386,9 @@ __ice_get_ethtool_stats(struct net_device *netdev,
 
 	ice_for_each_alloc_rxq(vsi, j) {
 		rx_ring = READ_ONCE(vsi->rx_rings[j]);
-		if (rx_ring) {
-			data[i++] = rx_ring->stats.pkts;
-			data[i++] = rx_ring->stats.bytes;
+		if (rx_ring && rx_ring->ring_stats) {
+			data[i++] = rx_ring->ring_stats->stats.pkts;
+			data[i++] = rx_ring->ring_stats->stats.bytes;
 		} else {
 			data[i++] = 0;
 			data[i++] = 0;
diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index a5945319b62e..9ff71d33b024 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -447,6 +447,52 @@ static irqreturn_t ice_eswitch_msix_clean_rings(int __always_unused irq, void *d
 	return IRQ_HANDLED;
 }
 
+/**
+ * ice_vsi_alloc_stat_arrays - Allocate statistics arrays
+ * @vsi: VSI pointer
+ */
+static int ice_vsi_alloc_stat_arrays(struct ice_vsi *vsi)
+{
+	struct ice_vsi_stats *vsi_stat;
+	struct ice_pf *pf = vsi->back;
+	struct device *dev;
+
+	dev = ice_pf_to_dev(pf);
+
+	if (vsi->type == ICE_VSI_CHNL)
+		return 0;
+	if (!pf->vsi_stats)
+		return -ENOENT;
+
+	vsi_stat = devm_kzalloc(dev, sizeof(*vsi_stat), GFP_KERNEL);
+	if (!vsi_stat)
+		return -ENOMEM;
+
+	pf->vsi_stats[vsi->idx] = vsi_stat;
+
+	vsi_stat->tx_ring_stats =
+		devm_kcalloc(dev, vsi->alloc_txq,
+			     sizeof(*vsi_stat->tx_ring_stats), GFP_KERNEL);
+
+	vsi_stat->rx_ring_stats =
+		devm_kcalloc(dev, vsi->alloc_rxq,
+			     sizeof(*vsi_stat->rx_ring_stats), GFP_KERNEL);
+
+	if (!vsi_stat->tx_ring_stats || !vsi_stat->rx_ring_stats)
+		goto err_alloc;
+
+	return 0;
+
+err_alloc:
+	devm_kfree(dev, vsi_stat->tx_ring_stats);
+	vsi_stat->tx_ring_stats = NULL;
+	devm_kfree(dev, vsi_stat->rx_ring_stats);
+	vsi_stat->rx_ring_stats = NULL;
+	devm_kfree(dev, vsi_stat);
+	pf->vsi_stats[vsi->idx] = NULL;
+	return -ENOMEM;
+}
+
 /**
  * ice_vsi_alloc - Allocates the next available struct VSI in the PF
  * @pf: board private structure
@@ -560,6 +606,11 @@ ice_vsi_alloc(struct ice_pf *pf, enum ice_vsi_type vsi_type,
 
 	if (vsi->type == ICE_VSI_CTRL && vf)
 		vf->ctrl_vsi_idx = vsi->idx;
+
+	/* allocate memory for Tx/Rx ring stat pointers */
+	if (ice_vsi_alloc_stat_arrays(vsi))
+		goto err_rings;
+
 	goto unlock_pf;
 
 err_rings:
@@ -1535,6 +1586,122 @@ static int ice_vsi_alloc_rings(struct ice_vsi *vsi)
 	return -ENOMEM;
 }
 
+/**
+ * ice_vsi_free_stats - Free the ring statistics structures
+ * @vsi: VSI pointer
+ */
+static void ice_vsi_free_stats(struct ice_vsi *vsi)
+{
+	struct ice_vsi_stats *vsi_stat;
+	struct ice_pf *pf = vsi->back;
+	struct device *dev;
+	int i;
+
+	dev = ice_pf_to_dev(pf);
+
+	if (vsi->type == ICE_VSI_CHNL)
+		return;
+	if (!pf->vsi_stats)
+		return;
+
+	vsi_stat = pf->vsi_stats[vsi->idx];
+	if (!vsi_stat)
+		return;
+
+	ice_for_each_alloc_txq(vsi, i) {
+		if (vsi_stat->tx_ring_stats[i]) {
+			kfree_rcu(vsi_stat->tx_ring_stats[i], rcu);
+			WRITE_ONCE(vsi_stat->tx_ring_stats[i], NULL);
+		}
+	}
+
+	ice_for_each_alloc_rxq(vsi, i) {
+		if (vsi_stat->rx_ring_stats[i]) {
+			kfree_rcu(vsi_stat->rx_ring_stats[i], rcu);
+			WRITE_ONCE(vsi_stat->rx_ring_stats[i], NULL);
+		}
+	}
+
+	devm_kfree(dev, vsi_stat->tx_ring_stats);
+	vsi_stat->tx_ring_stats = NULL;
+	devm_kfree(dev, vsi_stat->rx_ring_stats);
+	vsi_stat->rx_ring_stats = NULL;
+	devm_kfree(dev, vsi_stat);
+	pf->vsi_stats[vsi->idx] = NULL;
+}
+
+/**
+ * ice_vsi_alloc_ring_stats - Allocates Tx and Rx ring stats for the VSI
+ * @vsi: VSI which is having stats allocated
+ */
+static int ice_vsi_alloc_ring_stats(struct ice_vsi *vsi)
+{
+	struct ice_ring_stats **tx_ring_stats;
+	struct ice_ring_stats **rx_ring_stats;
+	struct ice_vsi_stats *vsi_stats;
+	struct ice_pf *pf = vsi->back;
+	u16 i;
+
+	if (!pf->vsi_stats)
+		return -ENOENT;
+
+	vsi_stats = pf->vsi_stats[vsi->idx];
+	if (!vsi_stats)
+		return -ENOENT;
+
+	tx_ring_stats = vsi_stats->tx_ring_stats;
+	if (!tx_ring_stats)
+		return -ENOENT;
+
+	rx_ring_stats = vsi_stats->rx_ring_stats;
+	if (!rx_ring_stats)
+		return -ENOENT;
+
+	/* Allocate Tx ring stats */
+	ice_for_each_alloc_txq(vsi, i) {
+		struct ice_ring_stats *ring_stats;
+		struct ice_tx_ring *ring;
+
+		ring = vsi->tx_rings[i];
+		ring_stats = tx_ring_stats[i];
+
+		if (!ring_stats) {
+			ring_stats = kzalloc(sizeof(*ring_stats), GFP_KERNEL);
+			if (!ring_stats)
+				goto err_out;
+
+			WRITE_ONCE(tx_ring_stats[i], ring_stats);
+		}
+
+		ring->ring_stats = ring_stats;
+	}
+
+	/* Allocate Rx ring stats */
+	ice_for_each_alloc_rxq(vsi, i) {
+		struct ice_ring_stats *ring_stats;
+		struct ice_rx_ring *ring;
+
+		ring = vsi->rx_rings[i];
+		ring_stats = rx_ring_stats[i];
+
+		if (!ring_stats) {
+			ring_stats = kzalloc(sizeof(*ring_stats), GFP_KERNEL);
+			if (!ring_stats)
+				goto err_out;
+
+			 WRITE_ONCE(rx_ring_stats[i], ring_stats);
+		}
+
+		ring->ring_stats = ring_stats;
+	}
+
+	return 0;
+
+err_out:
+	ice_vsi_free_stats(vsi);
+	return -ENOMEM;
+}
+
 /**
  * ice_vsi_manage_rss_lut - disable/enable RSS
  * @vsi: the VSI being changed
@@ -2555,6 +2722,10 @@ ice_vsi_setup(struct ice_pf *pf, struct ice_port_info *pi,
 		if (ret)
 			goto unroll_vector_base;
 
+		ret = ice_vsi_alloc_ring_stats(vsi);
+		if (ret)
+			goto unroll_vector_base;
+
 		ice_vsi_map_rings_to_vectors(vsi);
 
 		/* ICE_VSI_CTRL does not need RSS so skip RSS processing */
@@ -2593,6 +2764,9 @@ ice_vsi_setup(struct ice_pf *pf, struct ice_port_info *pi,
 		if (ret)
 			goto unroll_vector_base;
 
+		ret = ice_vsi_alloc_ring_stats(vsi);
+		if (ret)
+			goto unroll_vector_base;
 		/* Do not exit if configuring RSS had an issue, at least
 		 * receive traffic on first queue. Hence no need to capture
 		 * return value
@@ -2606,6 +2780,11 @@ ice_vsi_setup(struct ice_pf *pf, struct ice_port_info *pi,
 		ret = ice_vsi_alloc_rings(vsi);
 		if (ret)
 			goto unroll_vsi_init;
+
+		ret = ice_vsi_alloc_ring_stats(vsi);
+		if (ret)
+			goto unroll_vector_base;
+
 		break;
 	default:
 		/* clean up the resources and exit */
@@ -2665,6 +2844,7 @@ ice_vsi_setup(struct ice_pf *pf, struct ice_port_info *pi,
 unroll_alloc_q_vector:
 	ice_vsi_free_q_vectors(vsi);
 unroll_vsi_init:
+	ice_vsi_free_stats(vsi);
 	ice_vsi_delete(vsi);
 unroll_get_qs:
 	ice_vsi_put_qs(vsi);
@@ -3056,7 +3236,7 @@ int ice_vsi_release(struct ice_vsi *vsi)
 	    vsi->agg_node && vsi->agg_node->valid)
 		vsi->agg_node->num_vsis--;
 	ice_vsi_clear_rings(vsi);
-
+	ice_vsi_free_stats(vsi);
 	ice_vsi_put_qs(vsi);
 
 	/* retain SW VSI data structure since it is needed to unregister and
@@ -3183,6 +3363,51 @@ ice_vsi_rebuild_set_coalesce(struct ice_vsi *vsi,
 	}
 }
 
+/**
+ * ice_vsi_realloc_stat_arrays - Frees unused stat structures
+ * @vsi: VSI pointer
+ * @prev_txq: Number of Tx rings before ring reallocation
+ * @prev_rxq: Number of Rx rings before ring reallocation
+ */
+static int
+ice_vsi_realloc_stat_arrays(struct ice_vsi *vsi, int prev_txq, int prev_rxq)
+{
+	struct ice_vsi_stats *vsi_stat;
+	struct ice_pf *pf = vsi->back;
+	int i;
+
+	if (!prev_txq || !prev_rxq)
+		return 0;
+	if (vsi->type == ICE_VSI_CHNL)
+		return 0;
+	if (!pf->vsi_stats)
+		return -ENOENT;
+
+	vsi_stat = pf->vsi_stats[vsi->idx];
+	if (!vsi_stat)
+		return -ENOENT;
+
+	if (vsi->num_txq < prev_txq) {
+		for (i = vsi->num_txq; i < prev_txq; i++) {
+			if (vsi_stat->tx_ring_stats[i]) {
+				kfree_rcu(vsi_stat->tx_ring_stats[i], rcu);
+				WRITE_ONCE(vsi_stat->tx_ring_stats[i], NULL);
+			}
+		}
+	}
+
+	if (vsi->num_rxq < prev_rxq) {
+		for (i = vsi->num_rxq; i < prev_rxq; i++) {
+			if (vsi_stat->rx_ring_stats[i]) {
+				kfree_rcu(vsi_stat->rx_ring_stats[i], rcu);
+				WRITE_ONCE(vsi_stat->rx_ring_stats[i], NULL);
+			}
+		}
+	}
+
+	return 0;
+}
+
 /**
  * ice_vsi_rebuild - Rebuild VSI after reset
  * @vsi: VSI to be rebuild
@@ -3194,10 +3419,10 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi)
 {
 	u16 max_txqs[ICE_MAX_TRAFFIC_CLASS] = { 0 };
 	struct ice_coalesce_stored *coalesce;
+	int ret, i, prev_txq, prev_rxq;
 	int prev_num_q_vectors = 0;
 	enum ice_vsi_type vtype;
 	struct ice_pf *pf;
-	int ret, i;
 
 	if (!vsi)
 		return -EINVAL;
@@ -3216,6 +3441,9 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi)
 
 	prev_num_q_vectors = ice_vsi_rebuild_get_coalesce(vsi, coalesce);
 
+	prev_txq = vsi->num_txq;
+	prev_rxq = vsi->num_rxq;
+
 	ice_rm_vsi_lan_cfg(vsi->port_info, vsi->idx);
 	ret = ice_rm_vsi_rdma_cfg(vsi->port_info, vsi->idx);
 	if (ret)
@@ -3282,6 +3510,10 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi)
 		if (ret)
 			goto err_vectors;
 
+		ret = ice_vsi_alloc_ring_stats(vsi);
+		if (ret)
+			goto err_vectors;
+
 		ice_vsi_map_rings_to_vectors(vsi);
 
 		vsi->stat_offsets_loaded = false;
@@ -3321,6 +3553,10 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi)
 		if (ret)
 			goto err_vectors;
 
+		ret = ice_vsi_alloc_ring_stats(vsi);
+		if (ret)
+			goto err_vectors;
+
 		vsi->stat_offsets_loaded = false;
 		break;
 	case ICE_VSI_CHNL:
@@ -3369,6 +3605,10 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi)
 			return ice_schedule_reset(pf, ICE_RESET_PFR);
 		}
 	}
+
+	if (ice_vsi_realloc_stat_arrays(vsi, prev_txq, prev_rxq))
+		goto err_vectors;
+
 	ice_vsi_rebuild_set_coalesce(vsi, coalesce, prev_num_q_vectors);
 	kfree(coalesce);
 
@@ -3710,9 +3950,9 @@ static void ice_update_ring_stats(struct ice_q_stats *stats, u64 pkts, u64 bytes
  */
 void ice_update_tx_ring_stats(struct ice_tx_ring *tx_ring, u64 pkts, u64 bytes)
 {
-	u64_stats_update_begin(&tx_ring->syncp);
-	ice_update_ring_stats(&tx_ring->stats, pkts, bytes);
-	u64_stats_update_end(&tx_ring->syncp);
+	u64_stats_update_begin(&tx_ring->ring_stats->syncp);
+	ice_update_ring_stats(&tx_ring->ring_stats->stats, pkts, bytes);
+	u64_stats_update_end(&tx_ring->ring_stats->syncp);
 }
 
 /**
@@ -3723,9 +3963,9 @@ void ice_update_tx_ring_stats(struct ice_tx_ring *tx_ring, u64 pkts, u64 bytes)
  */
 void ice_update_rx_ring_stats(struct ice_rx_ring *rx_ring, u64 pkts, u64 bytes)
 {
-	u64_stats_update_begin(&rx_ring->syncp);
-	ice_update_ring_stats(&rx_ring->stats, pkts, bytes);
-	u64_stats_update_end(&rx_ring->syncp);
+	u64_stats_update_begin(&rx_ring->ring_stats->syncp);
+	ice_update_ring_stats(&rx_ring->ring_stats->stats, pkts, bytes);
+	u64_stats_update_end(&rx_ring->ring_stats->syncp);
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index ac893ce39e5e..b500c3d63d5c 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -130,12 +130,17 @@ static void ice_check_for_hang_subtask(struct ice_pf *pf)
 
 	ice_for_each_txq(vsi, i) {
 		struct ice_tx_ring *tx_ring = vsi->tx_rings[i];
+		struct ice_ring_stats *ring_stats;
 
 		if (!tx_ring)
 			continue;
 		if (ice_ring_ch_enabled(tx_ring))
 			continue;
 
+		ring_stats = tx_ring->ring_stats;
+		if (!ring_stats)
+			continue;
+
 		if (tx_ring->desc) {
 			/* If packet counter has not changed the queue is
 			 * likely stalled, so force an interrupt for this
@@ -144,8 +149,8 @@ static void ice_check_for_hang_subtask(struct ice_pf *pf)
 			 * prev_pkt would be negative if there was no
 			 * pending work.
 			 */
-			packets = tx_ring->stats.pkts & INT_MAX;
-			if (tx_ring->tx_stats.prev_pkt == packets) {
+			packets = ring_stats->stats.pkts & INT_MAX;
+			if (ring_stats->tx_stats.prev_pkt == packets) {
 				/* Trigger sw interrupt to revive the queue */
 				ice_trigger_sw_intr(hw, tx_ring->q_vector);
 				continue;
@@ -155,7 +160,7 @@ static void ice_check_for_hang_subtask(struct ice_pf *pf)
 			 * to ice_get_tx_pending()
 			 */
 			smp_rmb();
-			tx_ring->tx_stats.prev_pkt =
+			ring_stats->tx_stats.prev_pkt =
 			    ice_get_tx_pending(tx_ring) ? packets : -1;
 		}
 	}
@@ -4846,11 +4851,19 @@ ice_probe(struct pci_dev *pdev, const struct pci_device_id __always_unused *ent)
 		goto err_init_pf_unroll;
 	}
 
+	pf->vsi_stats = devm_kcalloc(dev, pf->num_alloc_vsi,
+				     sizeof(*pf->vsi_stats), GFP_KERNEL);
+
+	if (!pf->vsi_stats) {
+		err = -ENOMEM;
+		goto err_init_vsi_unroll;
+	}
+
 	err = ice_init_interrupt_scheme(pf);
 	if (err) {
 		dev_err(dev, "ice_init_interrupt_scheme failed: %d\n", err);
 		err = -EIO;
-		goto err_init_vsi_unroll;
+		goto err_init_vsi_stats_unroll;
 	}
 
 	/* In case of MSIX we are going to setup the misc vector right here
@@ -5031,6 +5044,9 @@ ice_probe(struct pci_dev *pdev, const struct pci_device_id __always_unused *ent)
 	ice_free_irq_msix_misc(pf);
 err_init_interrupt_unroll:
 	ice_clear_interrupt_scheme(pf);
+err_init_vsi_stats_unroll:
+	devm_kfree(dev, pf->vsi_stats);
+	pf->vsi_stats = NULL;
 err_init_vsi_unroll:
 	devm_kfree(dev, pf->vsi);
 err_init_pf_unroll:
@@ -5153,6 +5169,8 @@ static void ice_remove(struct pci_dev *pdev)
 			continue;
 		ice_vsi_free_q_vectors(pf->vsi[i]);
 	}
+	devm_kfree(&pdev->dev, pf->vsi_stats);
+	pf->vsi_stats = NULL;
 	ice_deinit_pf(pf);
 	ice_devlink_destroy_regions(pf);
 	ice_deinit_hw(&pf->hw);
@@ -6470,14 +6488,16 @@ ice_update_vsi_tx_ring_stats(struct ice_vsi *vsi,
 		u64 pkts = 0, bytes = 0;
 
 		ring = READ_ONCE(rings[i]);
-		if (!ring)
+		if (!ring || !ring->ring_stats)
 			continue;
-		ice_fetch_u64_stats_per_ring(&ring->syncp, ring->stats, &pkts, &bytes);
+		ice_fetch_u64_stats_per_ring(&ring->ring_stats->syncp,
+					     ring->ring_stats->stats, &pkts,
+					     &bytes);
 		vsi_stats->tx_packets += pkts;
 		vsi_stats->tx_bytes += bytes;
-		vsi->tx_restart += ring->tx_stats.restart_q;
-		vsi->tx_busy += ring->tx_stats.tx_busy;
-		vsi->tx_linearize += ring->tx_stats.tx_linearize;
+		vsi->tx_restart += ring->ring_stats->tx_stats.restart_q;
+		vsi->tx_busy += ring->ring_stats->tx_stats.tx_busy;
+		vsi->tx_linearize += ring->ring_stats->tx_stats.tx_linearize;
 	}
 }
 
@@ -6512,12 +6532,16 @@ static void ice_update_vsi_ring_stats(struct ice_vsi *vsi)
 	/* update Rx rings counters */
 	ice_for_each_rxq(vsi, i) {
 		struct ice_rx_ring *ring = READ_ONCE(vsi->rx_rings[i]);
+		struct ice_ring_stats *ring_stats;
 
-		ice_fetch_u64_stats_per_ring(&ring->syncp, ring->stats, &pkts, &bytes);
+		ring_stats = ring->ring_stats;
+		ice_fetch_u64_stats_per_ring(&ring_stats->syncp,
+					     ring_stats->stats, &pkts,
+					     &bytes);
 		vsi_stats->rx_packets += pkts;
 		vsi_stats->rx_bytes += bytes;
-		vsi->rx_buf_failed += ring->rx_stats.alloc_buf_failed;
-		vsi->rx_page_failed += ring->rx_stats.alloc_page_failed;
+		vsi->rx_buf_failed += ring_stats->rx_stats.alloc_buf_failed;
+		vsi->rx_page_failed += ring_stats->rx_stats.alloc_page_failed;
 	}
 
 	/* update XDP Tx rings counters */
diff --git a/drivers/net/ethernet/intel/ice/ice_repr.c b/drivers/net/ethernet/intel/ice/ice_repr.c
index bd31748aae1b..05f1c2276b48 100644
--- a/drivers/net/ethernet/intel/ice/ice_repr.c
+++ b/drivers/net/ethernet/intel/ice/ice_repr.c
@@ -163,18 +163,20 @@ ice_repr_sp_stats64(const struct net_device *dev,
 	u64 pkts, bytes;
 
 	tx_ring = np->vsi->tx_rings[vf_id];
-	ice_fetch_u64_stats_per_ring(&tx_ring->syncp, tx_ring->stats,
+	ice_fetch_u64_stats_per_ring(&tx_ring->ring_stats->syncp,
+				     tx_ring->ring_stats->stats,
 				     &pkts, &bytes);
 	stats->rx_packets = pkts;
 	stats->rx_bytes = bytes;
 
 	rx_ring = np->vsi->rx_rings[vf_id];
-	ice_fetch_u64_stats_per_ring(&rx_ring->syncp, rx_ring->stats,
+	ice_fetch_u64_stats_per_ring(&rx_ring->ring_stats->syncp,
+				     rx_ring->ring_stats->stats,
 				     &pkts, &bytes);
 	stats->tx_packets = pkts;
 	stats->tx_bytes = bytes;
-	stats->tx_dropped = rx_ring->rx_stats.alloc_page_failed +
-			    rx_ring->rx_stats.alloc_buf_failed;
+	stats->tx_dropped = rx_ring->ring_stats->rx_stats.alloc_page_failed +
+			    rx_ring->ring_stats->rx_stats.alloc_buf_failed;
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index dbe80e5053a8..086f0b3ab68d 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -325,7 +325,7 @@ static bool ice_clean_tx_irq(struct ice_tx_ring *tx_ring, int napi_budget)
 		if (netif_tx_queue_stopped(txring_txq(tx_ring)) &&
 		    !test_bit(ICE_VSI_DOWN, vsi->state)) {
 			netif_tx_wake_queue(txring_txq(tx_ring));
-			++tx_ring->tx_stats.restart_q;
+			++tx_ring->ring_stats->tx_stats.restart_q;
 		}
 	}
 
@@ -367,7 +367,7 @@ int ice_setup_tx_ring(struct ice_tx_ring *tx_ring)
 
 	tx_ring->next_to_use = 0;
 	tx_ring->next_to_clean = 0;
-	tx_ring->tx_stats.prev_pkt = -1;
+	tx_ring->ring_stats->tx_stats.prev_pkt = -1;
 	return 0;
 
 err:
@@ -667,7 +667,7 @@ ice_alloc_mapped_page(struct ice_rx_ring *rx_ring, struct ice_rx_buf *bi)
 	/* alloc new page for storage */
 	page = dev_alloc_pages(ice_rx_pg_order(rx_ring));
 	if (unlikely(!page)) {
-		rx_ring->rx_stats.alloc_page_failed++;
+		rx_ring->ring_stats->rx_stats.alloc_page_failed++;
 		return false;
 	}
 
@@ -680,7 +680,7 @@ ice_alloc_mapped_page(struct ice_rx_ring *rx_ring, struct ice_rx_buf *bi)
 	 */
 	if (dma_mapping_error(rx_ring->dev, dma)) {
 		__free_pages(page, ice_rx_pg_order(rx_ring));
-		rx_ring->rx_stats.alloc_page_failed++;
+		rx_ring->ring_stats->rx_stats.alloc_page_failed++;
 		return false;
 	}
 
@@ -1091,7 +1091,7 @@ ice_is_non_eop(struct ice_rx_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc)
 	if (likely(ice_test_staterr(rx_desc->wb.status_error0, ICE_RXD_EOF)))
 		return false;
 
-	rx_ring->rx_stats.non_eop_descs++;
+	rx_ring->ring_stats->rx_stats.non_eop_descs++;
 
 	return true;
 }
@@ -1222,7 +1222,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 		}
 		/* exit if we failed to retrieve a buffer */
 		if (!skb) {
-			rx_ring->rx_stats.alloc_buf_failed++;
+			rx_ring->ring_stats->rx_stats.alloc_buf_failed++;
 			if (rx_buf)
 				rx_buf->pagecnt_bias++;
 			break;
@@ -1275,7 +1275,9 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 		ice_finalize_xdp_rx(xdp_ring, xdp_xmit);
 	rx_ring->skb = skb;
 
-	ice_update_rx_ring_stats(rx_ring, total_rx_pkts, total_rx_bytes);
+	if (rx_ring->ring_stats)
+		ice_update_rx_ring_stats(rx_ring, total_rx_pkts,
+					 total_rx_bytes);
 
 	/* guarantee a trip back through this routine if there was a failure */
 	return failure ? budget : (int)total_rx_pkts;
@@ -1292,15 +1294,25 @@ static void __ice_update_sample(struct ice_q_vector *q_vector,
 		struct ice_tx_ring *tx_ring;
 
 		ice_for_each_tx_ring(tx_ring, *rc) {
-			packets += tx_ring->stats.pkts;
-			bytes += tx_ring->stats.bytes;
+			struct ice_ring_stats *ring_stats;
+
+			ring_stats = tx_ring->ring_stats;
+			if (!ring_stats)
+				continue;
+			packets += ring_stats->stats.pkts;
+			bytes += ring_stats->stats.bytes;
 		}
 	} else {
 		struct ice_rx_ring *rx_ring;
 
 		ice_for_each_rx_ring(rx_ring, *rc) {
-			packets += rx_ring->stats.pkts;
-			bytes += rx_ring->stats.bytes;
+			struct ice_ring_stats *ring_stats;
+
+			ring_stats = rx_ring->ring_stats;
+			if (!ring_stats)
+				continue;
+			packets += ring_stats->stats.pkts;
+			bytes += ring_stats->stats.bytes;
 		}
 	}
 
@@ -1549,7 +1561,7 @@ static int __ice_maybe_stop_tx(struct ice_tx_ring *tx_ring, unsigned int size)
 
 	/* A reprieve! - use start_queue because it doesn't call schedule */
 	netif_tx_start_queue(txring_txq(tx_ring));
-	++tx_ring->tx_stats.restart_q;
+	++tx_ring->ring_stats->tx_stats.restart_q;
 	return 0;
 }
 
@@ -2293,7 +2305,7 @@ ice_xmit_frame_ring(struct sk_buff *skb, struct ice_tx_ring *tx_ring)
 		if (__skb_linearize(skb))
 			goto out_drop;
 		count = ice_txd_use_count(skb->len);
-		tx_ring->tx_stats.tx_linearize++;
+		tx_ring->ring_stats->tx_stats.tx_linearize++;
 	}
 
 	/* need: 1 descriptor per page * PAGE_SIZE/ICE_MAX_DATA_PER_TXD,
@@ -2304,7 +2316,7 @@ ice_xmit_frame_ring(struct sk_buff *skb, struct ice_tx_ring *tx_ring)
 	 */
 	if (ice_maybe_stop_tx(tx_ring, count + ICE_DESCS_PER_CACHE_LINE +
 			      ICE_DESCS_FOR_CTX_DESC)) {
-		tx_ring->tx_stats.tx_busy++;
+		tx_ring->ring_stats->tx_stats.tx_busy++;
 		return NETDEV_TX_BUSY;
 	}
 
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index 932b5661ec4d..4fd0e5d0a313 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -191,6 +191,16 @@ struct ice_rxq_stats {
 	u64 alloc_buf_failed;
 };
 
+struct ice_ring_stats {
+	struct rcu_head rcu;	/* to avoid race on free */
+	struct ice_q_stats stats;
+	struct u64_stats_sync syncp;
+	union {
+		struct ice_txq_stats tx_stats;
+		struct ice_rxq_stats rx_stats;
+	};
+};
+
 enum ice_ring_state_t {
 	ICE_TX_XPS_INIT_DONE,
 	ICE_TX_NBITS,
@@ -283,9 +293,7 @@ struct ice_rx_ring {
 	u16 rx_buf_len;
 
 	/* stats structs */
-	struct ice_rxq_stats rx_stats;
-	struct ice_q_stats	stats;
-	struct u64_stats_sync syncp;
+	struct ice_ring_stats *ring_stats;
 
 	struct rcu_head rcu;		/* to avoid race on free */
 	/* CL4 - 3rd cacheline starts here */
@@ -325,10 +333,8 @@ struct ice_tx_ring {
 	u16 count;			/* Number of descriptors */
 	u16 q_index;			/* Queue number of ring */
 	/* stats structs */
-	struct ice_txq_stats tx_stats;
+	struct ice_ring_stats *ring_stats;
 	/* CL3 - 3rd cacheline starts here */
-	struct ice_q_stats	stats;
-	struct u64_stats_sync syncp;
 	struct rcu_head rcu;		/* to avoid race on free */
 	DECLARE_BITMAP(xps_state, ICE_TX_NBITS);	/* XPS Config State */
 	struct ice_channel *ch;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 7ee38d02d1e5..25f04266c668 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -285,7 +285,7 @@ int ice_xmit_xdp_ring(void *data, u16 size, struct ice_tx_ring *xdp_ring)
 		ice_clean_xdp_irq(xdp_ring);
 
 	if (!unlikely(ICE_DESC_UNUSED(xdp_ring))) {
-		xdp_ring->tx_stats.tx_busy++;
+		xdp_ring->ring_stats->tx_stats.tx_busy++;
 		return ICE_XDP_CONSUMED;
 	}
 
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 056c904b83cc..907055b77af0 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -24,13 +24,24 @@ static struct xdp_buff **ice_xdp_buf(struct ice_rx_ring *rx_ring, u32 idx)
  */
 static void ice_qp_reset_stats(struct ice_vsi *vsi, u16 q_idx)
 {
-	memset(&vsi->rx_rings[q_idx]->rx_stats, 0,
-	       sizeof(vsi->rx_rings[q_idx]->rx_stats));
-	memset(&vsi->tx_rings[q_idx]->stats, 0,
-	       sizeof(vsi->tx_rings[q_idx]->stats));
+	struct ice_vsi_stats *vsi_stat;
+	struct ice_pf *pf;
+
+	pf = vsi->back;
+	if (!pf->vsi_stats)
+		return;
+
+	vsi_stat = pf->vsi_stats[vsi->idx];
+	if (!vsi_stat)
+		return;
+
+	memset(&vsi_stat->rx_ring_stats[q_idx]->rx_stats, 0,
+	       sizeof(vsi_stat->rx_ring_stats[q_idx]->rx_stats));
+	memset(&vsi_stat->tx_ring_stats[q_idx]->stats, 0,
+	       sizeof(vsi_stat->tx_ring_stats[q_idx]->stats));
 	if (ice_is_xdp_ena_vsi(vsi))
-		memset(&vsi->xdp_rings[q_idx]->stats, 0,
-		       sizeof(vsi->xdp_rings[q_idx]->stats));
+		memset(&vsi->xdp_rings[q_idx]->ring_stats->stats, 0,
+		       sizeof(vsi->xdp_rings[q_idx]->ring_stats->stats));
 }
 
 /**
@@ -722,7 +733,7 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
 		/* XDP_PASS path */
 		skb = ice_construct_skb_zc(rx_ring, xdp);
 		if (!skb) {
-			rx_ring->rx_stats.alloc_buf_failed++;
+			rx_ring->ring_stats->rx_stats.alloc_buf_failed++;
 			break;
 		}
 
-- 
2.34.3

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Re: [Intel-wired-lan] [net-next, v2 1/2] ice: Accumulate HW and Netdev statistics over reset

[G, GurucharanX]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Benjamin Mikailenko
> Sent: Tuesday, October 11, 2022 12:52 AM
> To: intel-wired-lan@lists.osuosl.org
> Cc: Mikailenko, Benjamin <benjamin.mikailenko@intel.com>
> Subject: [Intel-wired-lan] [net-next, v2 1/2] ice: Accumulate HW and Netdev
> statistics over reset
> 
> Resets happen with or without user interaction. For example, incidents such
> as TX hang or a reconfiguration of parameters will result in a reset.
> During reset, hardware and software statistics were set to zero. This created
> an issue for the user where a reset happens in the background, statistics set
> to zero, and the user checks statistics expecting them to be populated.
> 
> To ensure this doesn't happen, keep accumulating stats over reset.
> 
> 1. Remove function calls which reset hardware and netdev statistics.
> 2. Do not rollover statistics in ice_stat_update40 during reset.
> 
> Signed-off-by: Benjamin Mikailenko <benjamin.mikailenko@intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice.h         |  1 +
>  drivers/net/ethernet/intel/ice/ice_dcb_lib.c |  3 ++
>  drivers/net/ethernet/intel/ice/ice_lib.c     |  7 +++++
>  drivers/net/ethernet/intel/ice/ice_main.c    | 30 +++++++++++++++++---
>  4 files changed, 37 insertions(+), 4 deletions(-)
> 

Tested-by: Gurucharan <gurucharanx.g@intel.com> (A Contingent worker at Intel)
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Re: [Intel-wired-lan] [net-next, v2 2/2] ice: Accumulate ring statistics over reset

[G, GurucharanX]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Benjamin Mikailenko
> Sent: Tuesday, October 11, 2022 12:52 AM
> To: intel-wired-lan@lists.osuosl.org
> Cc: Mikailenko, Benjamin <benjamin.mikailenko@intel.com>
> Subject: [Intel-wired-lan] [net-next, v2 2/2] ice: Accumulate ring statistics
> over reset
> 
> Resets may occur with or without user interaction. For example, a TX hang or
> reconfiguration of parameters will result in a reset. During reset, the VSI is
> freed, freeing any statistics structures inside as well. This would create an
> issue for the user where a reset happens in the background, statistics set to
> zero, and the user checks ring statistics expecting them to be populated.
> 
> To ensure this doesn't happen, accumulate ring statistics over reset.
> 
> Define a new ring statistics structure, ice_ring_stats. The new structure lives
> in the VSI's parent, preserving ring statistics when VSI is freed.
> 
> 1. Define a new structure vsi_ring_stats in the PF scope 2. Allocate/free stats
> only during probe, unload, or change in ring size 3. Replace previous ring
> statistics functionality with new structure
> 
> Signed-off-by: Benjamin Mikailenko <benjamin.mikailenko@intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice.h          |   6 +
>  drivers/net/ethernet/intel/ice/ice_ethtool.c  |  12 +-
>  drivers/net/ethernet/intel/ice/ice_lib.c      | 256 +++++++++++++++++-
>  drivers/net/ethernet/intel/ice/ice_main.c     |  48 +++-
>  drivers/net/ethernet/intel/ice/ice_repr.c     |  10 +-
>  drivers/net/ethernet/intel/ice/ice_txrx.c     |  40 ++-
>  drivers/net/ethernet/intel/ice/ice_txrx.h     |  18 +-
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.c |   2 +-
>  drivers/net/ethernet/intel/ice/ice_xsk.c      |  25 +-
>  9 files changed, 359 insertions(+), 58 deletions(-)
> 

Tested-by: Gurucharan <gurucharanx.g@intel.com> (A Contingent worker at Intel)
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Re: [Intel-wired-lan] [net-next, v2 2/2] ice: Accumulate ring statistics over reset

[Jacob Keller]

On 10/10/2022 12:22 PM, Benjamin Mikailenko wrote:
> Resets may occur with or without user interaction. For example, a TX hang
> or reconfiguration of parameters will result in a reset. During reset, the
> VSI is freed, freeing any statistics structures inside as well. This would
> create an issue for the user where a reset happens in the background,
> statistics set to zero, and the user checks ring statistics expecting them
> to be populated.
> 
> To ensure this doesn't happen, accumulate ring statistics over reset.
> 
> Define a new ring statistics structure, ice_ring_stats. The new structure
> lives in the VSI's parent, preserving ring statistics when VSI is freed.
> 
> 1. Define a new structure vsi_ring_stats in the PF scope
> 2. Allocate/free stats only during probe, unload, or change in ring size
> 3. Replace previous ring statistics functionality with new structure
> 
> Signed-off-by: Benjamin Mikailenko <benjamin.mikailenko@intel.com>
> ---

I found a potential use-after-free bug in ice_vsi_alloc with these changes:

>  /**
>   * ice_vsi_alloc - Allocates the next available struct VSI in the PF
>   * @pf: board private structure
> @@ -560,6 +606,11 @@ ice_vsi_alloc(struct ice_pf *pf, enum ice_vsi_type vsi_type,
>  
>  	if (vsi->type == ICE_VSI_CTRL && vf)
>  		vf->ctrl_vsi_idx = vsi->idx;
> +
> +	/* allocate memory for Tx/Rx ring stat pointers */
> +	if (ice_vsi_alloc_stat_arrays(vsi))
> +		goto err_rings;
> +
>  	goto unlock_pf;
>  

This is placed in ice_vsi_alloc after we insert the VSI into the PF
array and update pointers such as the next_vsi and ctrl_vsi_idx. Doing
so means that if this function fails we will leave stale data behind in
the PF resulting in a use-after-free when tearing down all the VSIs.

This can be avoided by moving this logic up higher to just before we
update the PF VSI array.

Thanks,
Jake
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Re: [Intel-wired-lan] [net-next, v2 2/2] ice: Accumulate ring statistics over reset

[Jacob Keller]

On 10/10/2022 12:22 PM, Benjamin Mikailenko wrote:
> +/**
> + * ice_vsi_alloc_stat_arrays - Allocate statistics arrays
> + * @vsi: VSI pointer
> + */
> +static int ice_vsi_alloc_stat_arrays(struct ice_vsi *vsi)
> +{
> +	struct ice_vsi_stats *vsi_stat;
> +	struct ice_pf *pf = vsi->back;
> +	struct device *dev;
> +
> +	dev = ice_pf_to_dev(pf);
> +
> +	if (vsi->type == ICE_VSI_CHNL)
> +		return 0;
> +	if (!pf->vsi_stats)
> +		return -ENOENT;
> +
> +	vsi_stat = devm_kzalloc(dev, sizeof(*vsi_stat), GFP_KERNEL);
> +	if (!vsi_stat)
> +		return -ENOMEM;
> +
> +	pf->vsi_stats[vsi->idx] = vsi_stat;
> +

This should also be moved to the end of the function so that we don't
modify pf->vsi_stats unless this function succeeds.

> +	vsi_stat->tx_ring_stats =
> +		devm_kcalloc(dev, vsi->alloc_txq,
> +			     sizeof(*vsi_stat->tx_ring_stats), GFP_KERNEL);
> +
> +	vsi_stat->rx_ring_stats =
> +		devm_kcalloc(dev, vsi->alloc_rxq,
> +			     sizeof(*vsi_stat->rx_ring_stats), GFP_KERNEL);
> +
> +	if (!vsi_stat->tx_ring_stats || !vsi_stat->rx_ring_stats)
> +		goto err_alloc;
> +
> +	return 0;
> +
> +err_alloc:
> +	devm_kfree(dev, vsi_stat->tx_ring_stats);
> +	vsi_stat->tx_ring_stats = NULL;
> +	devm_kfree(dev, vsi_stat->rx_ring_stats);
> +	vsi_stat->rx_ring_stats = NULL;
> +	devm_kfree(dev, vsi_stat);
> +	pf->vsi_stats[vsi->idx] = NULL;
> +	return -ENOMEM;
> +}
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