ice: split ice_ring onto Tx/Rx separate structs

While it was convenient to have a generic ring structure that served
both Tx and Rx sides, next commits are going to introduce several
Tx-specific fields, so in order to avoid hurting the Rx side, let's
pull out the Tx ring onto new ice_tx_ring and ice_rx_ring structs.

Rx ring could be handled by the old ice_ring which would reduce the code
churn within this patch, but this would make things asymmetric.

Make the union out of the ring container within ice_q_vector so that it
is possible to iterate over newly introduced ice_tx_ring.

Remove the @size as it's only accessed from control path and it can be
calculated pretty easily.

Change definitions of ice_update_ring_stats and
ice_fetch_u64_stats_per_ring so that they are ring agnostic and can be
used for both Rx and Tx rings.

Sizes of Rx and Tx ring structs are 256 and 192 bytes, respectively. In
Rx ring xdp_rxq_info occupies its own cacheline, so it's the major
difference now.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 34 insertions, 35 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index da91d9f9128c..e4c12a87785c 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -62,7 +62,7 @@ bool netif_is_ice(struct net_device *dev)
  * ice_get_tx_pending - returns number of Tx descriptors not processed
  * @ring: the ring of descriptors
  */
-static u16 ice_get_tx_pending(struct ice_ring *ring)
+static u16 ice_get_tx_pending(struct ice_tx_ring *ring)
 {
 	u16 head, tail;
 
@@ -102,7 +102,7 @@ static void ice_check_for_hang_subtask(struct ice_pf *pf)
 	hw = &vsi->back->hw;
 
 	for (i = 0; i < vsi->num_txq; i++) {
-		struct ice_ring *tx_ring = vsi->tx_rings[i];
+		struct ice_tx_ring *tx_ring = vsi->tx_rings[i];
 
 		if (tx_ring && tx_ring->desc) {
 			/* If packet counter has not changed the queue is
@@ -2307,14 +2307,14 @@ static int ice_vsi_req_irq_msix(struct ice_vsi *vsi, char *basename)
 
 		irq_num = pf->msix_entries[base + vector].vector;
 
-		if (q_vector->tx.ring && q_vector->rx.ring) {
+		if (q_vector->tx.tx_ring && q_vector->rx.rx_ring) {
 			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
 				 "%s-%s-%d", basename, "TxRx", rx_int_idx++);
 			tx_int_idx++;
-		} else if (q_vector->rx.ring) {
+		} else if (q_vector->rx.rx_ring) {
 			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
 				 "%s-%s-%d", basename, "rx", rx_int_idx++);
-		} else if (q_vector->tx.ring) {
+		} else if (q_vector->tx.tx_ring) {
 			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
 				 "%s-%s-%d", basename, "tx", tx_int_idx++);
 		} else {
@@ -2376,7 +2376,7 @@ static int ice_xdp_alloc_setup_rings(struct ice_vsi *vsi)
 
 	for (i = 0; i < vsi->num_xdp_txq; i++) {
 		u16 xdp_q_idx = vsi->alloc_txq + i;
-		struct ice_ring *xdp_ring;
+		struct ice_tx_ring *xdp_ring;
 
 		xdp_ring = kzalloc(sizeof(*xdp_ring), GFP_KERNEL);
 
@@ -2393,7 +2393,7 @@ static int ice_xdp_alloc_setup_rings(struct ice_vsi *vsi)
 		if (ice_setup_tx_ring(xdp_ring))
 			goto free_xdp_rings;
 		ice_set_ring_xdp(xdp_ring);
-		xdp_ring->xsk_pool = ice_xsk_pool(xdp_ring);
+		xdp_ring->xsk_pool = ice_tx_xsk_pool(xdp_ring);
 	}
 
 	return 0;
@@ -2472,11 +2472,11 @@ int ice_prepare_xdp_rings(struct ice_vsi *vsi, struct bpf_prog *prog)
 		q_base = vsi->num_xdp_txq - xdp_rings_rem;
 
 		for (q_id = q_base; q_id < (q_base + xdp_rings_per_v); q_id++) {
-			struct ice_ring *xdp_ring = vsi->xdp_rings[q_id];
+			struct ice_tx_ring *xdp_ring = vsi->xdp_rings[q_id];
 
 			xdp_ring->q_vector = q_vector;
-			xdp_ring->next = q_vector->tx.ring;
-			q_vector->tx.ring = xdp_ring;
+			xdp_ring->next = q_vector->tx.tx_ring;
+			q_vector->tx.tx_ring = xdp_ring;
 		}
 		xdp_rings_rem -= xdp_rings_per_v;
 	}
@@ -2546,14 +2546,14 @@ int ice_destroy_xdp_rings(struct ice_vsi *vsi)
 
 	ice_for_each_q_vector(vsi, v_idx) {
 		struct ice_q_vector *q_vector = vsi->q_vectors[v_idx];
-		struct ice_ring *ring;
+		struct ice_tx_ring *ring;
 
-		ice_for_each_ring(ring, q_vector->tx)
+		ice_for_each_tx_ring(ring, q_vector->tx)
 			if (!ring->tx_buf || !ice_ring_is_xdp(ring))
 				break;
 
 		/* restore the value of last node prior to XDP setup */
-		q_vector->tx.ring = ring;
+		q_vector->tx.tx_ring = ring;
 	}
 
 free_qmap:
@@ -2602,7 +2602,7 @@ static void ice_vsi_rx_napi_schedule(struct ice_vsi *vsi)
 	int i;
 
 	ice_for_each_rxq(vsi, i) {
-		struct ice_ring *rx_ring = vsi->rx_rings[i];
+		struct ice_rx_ring *rx_ring = vsi->rx_rings[i];
 
 		if (rx_ring->xsk_pool)
 			napi_schedule(&rx_ring->q_vector->napi);
@@ -5571,7 +5571,7 @@ static void ice_napi_enable_all(struct ice_vsi *vsi)
 		INIT_WORK(&q_vector->rx.dim.work, ice_rx_dim_work);
 		q_vector->rx.dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
 
-		if (q_vector->rx.ring || q_vector->tx.ring)
+		if (q_vector->rx.rx_ring || q_vector->tx.tx_ring)
 			napi_enable(&q_vector->napi);
 	}
 }
@@ -5631,7 +5631,8 @@ int ice_up(struct ice_vsi *vsi)
 
 /**
  * ice_fetch_u64_stats_per_ring - get packets and bytes stats per ring
- * @ring: Tx or Rx ring to read stats from
+ * @syncp: pointer to u64_stats_sync
+ * @stats: stats that pkts and bytes count will be taken from
  * @pkts: packets stats counter
  * @bytes: bytes stats counter
  *
@@ -5639,19 +5640,16 @@ int ice_up(struct ice_vsi *vsi)
  * that needs to be performed to read u64 values in 32 bit machine.
  */
 static void
-ice_fetch_u64_stats_per_ring(struct ice_ring *ring, u64 *pkts, u64 *bytes)
+ice_fetch_u64_stats_per_ring(struct u64_stats_sync *syncp, struct ice_q_stats stats,
+			     u64 *pkts, u64 *bytes)
 {
 	unsigned int start;
-	*pkts = 0;
-	*bytes = 0;
 
-	if (!ring)
-		return;
 	do {
-		start = u64_stats_fetch_begin_irq(&ring->syncp);
-		*pkts = ring->stats.pkts;
-		*bytes = ring->stats.bytes;
-	} while (u64_stats_fetch_retry_irq(&ring->syncp, start));
+		start = u64_stats_fetch_begin_irq(syncp);
+		*pkts = stats.pkts;
+		*bytes = stats.bytes;
+	} while (u64_stats_fetch_retry_irq(syncp, start));
 }
 
 /**
@@ -5661,18 +5659,19 @@ ice_fetch_u64_stats_per_ring(struct ice_ring *ring, u64 *pkts, u64 *bytes)
  * @count: number of rings
  */
 static void
-ice_update_vsi_tx_ring_stats(struct ice_vsi *vsi, struct ice_ring **rings,
+ice_update_vsi_tx_ring_stats(struct ice_vsi *vsi, struct ice_tx_ring **rings,
 			     u16 count)
 {
 	struct rtnl_link_stats64 *vsi_stats = &vsi->net_stats;
 	u16 i;
 
 	for (i = 0; i < count; i++) {
-		struct ice_ring *ring;
-		u64 pkts, bytes;
+		struct ice_tx_ring *ring;
+		u64 pkts = 0, bytes = 0;
 
 		ring = READ_ONCE(rings[i]);
-		ice_fetch_u64_stats_per_ring(ring, &pkts, &bytes);
+		if (ring)
+			ice_fetch_u64_stats_per_ring(&ring->syncp, ring->stats, &pkts, &bytes);
 		vsi_stats->tx_packets += pkts;
 		vsi_stats->tx_bytes += bytes;
 		vsi->tx_restart += ring->tx_stats.restart_q;
@@ -5711,9 +5710,9 @@ static void ice_update_vsi_ring_stats(struct ice_vsi *vsi)
 
 	/* update Rx rings counters */
 	ice_for_each_rxq(vsi, i) {
-		struct ice_ring *ring = READ_ONCE(vsi->rx_rings[i]);
+		struct ice_rx_ring *ring = READ_ONCE(vsi->rx_rings[i]);
 
-		ice_fetch_u64_stats_per_ring(ring, &pkts, &bytes);
+		ice_fetch_u64_stats_per_ring(&ring->syncp, ring->stats, &pkts, &bytes);
 		vsi_stats->rx_packets += pkts;
 		vsi_stats->rx_bytes += bytes;
 		vsi->rx_buf_failed += ring->rx_stats.alloc_buf_failed;
@@ -5977,7 +5976,7 @@ static void ice_napi_disable_all(struct ice_vsi *vsi)
 	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)
+		if (q_vector->rx.rx_ring || q_vector->tx.tx_ring)
 			napi_disable(&q_vector->napi);
 
 		cancel_work_sync(&q_vector->tx.dim.work);
@@ -6062,7 +6061,7 @@ int ice_vsi_setup_tx_rings(struct ice_vsi *vsi)
 	}
 
 	ice_for_each_txq(vsi, i) {
-		struct ice_ring *ring = vsi->tx_rings[i];
+		struct ice_tx_ring *ring = vsi->tx_rings[i];
 
 		if (!ring)
 			return -EINVAL;
@@ -6094,7 +6093,7 @@ int ice_vsi_setup_rx_rings(struct ice_vsi *vsi)
 	}
 
 	ice_for_each_rxq(vsi, i) {
-		struct ice_ring *ring = vsi->rx_rings[i];
+		struct ice_rx_ring *ring = vsi->rx_rings[i];
 
 		if (!ring)
 			return -EINVAL;
@@ -6998,7 +6997,7 @@ ice_bridge_setlink(struct net_device *dev, struct nlmsghdr *nlh,
 static void ice_tx_timeout(struct net_device *netdev, unsigned int txqueue)
 {
 	struct ice_netdev_priv *np = netdev_priv(netdev);
-	struct ice_ring *tx_ring = NULL;
+	struct ice_tx_ring *tx_ring = NULL;
 	struct ice_vsi *vsi = np->vsi;
 	struct ice_pf *pf = vsi->back;
 	u32 i;