net/mlx4_en: Refactor the XDP forwarding rings scheme

Separately manage the two types of TX rings: regular ones, and XDP.
Upon an XDP set, do not borrow regular TX rings and convert them
into XDP ones, but allocate new ones, unless we hit the max number
of rings.
Which means that in systems with smaller #cores we will not consume
the current TX rings for XDP, while we are still in the num TX limit.

XDP TX rings counters are not shown in ethtool statistics.
Instead, XDP counters will be added to the respective RX rings
in a downstream patch.

This has no performance implications.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Tariq Toukan

drivers/net/ethernet/mellanox/mlx4/en_cq.c

@@ -127,15 +127,7 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
 		/* For TX we use the same irq per
 		ring we assigned for the RX    */
 		struct mlx4_en_cq *rx_cq;
-		int xdp_index;
-
-		/* The xdp tx irq must align with the rx ring that forwards to
-		 * it, so reindex these from 0. This should only happen when
-		 * tx_ring_num is not a multiple of rx_ring_num.
-		 */
-		xdp_index = (priv->xdp_ring_num - priv->tx_ring_num) + cq_idx;
-		if (xdp_index >= 0)
-			cq_idx = xdp_index;
+
 		cq_idx = cq_idx % priv->rx_ring_num;
 		rx_cq = priv->rx_cq[cq_idx];
 		cq->vector = rx_cq->vector;

drivers/net/ethernet/mellanox/mlx4/en_ethtool.c

@@ -49,16 +49,19 @@
 
 static int mlx4_en_moderation_update(struct mlx4_en_priv *priv)
 {
-	int i;
+	int i, t;
 	int err = 0;
 
-	for (i = 0; i < priv->tx_ring_num; i++) {
-		priv->tx_cq[i]->moder_cnt = priv->tx_frames;
-		priv->tx_cq[i]->moder_time = priv->tx_usecs;
-		if (priv->port_up) {
-			err = mlx4_en_set_cq_moder(priv, priv->tx_cq[i]);
-			if (err)
-				return err;
+	for (t = 0 ; t < MLX4_EN_NUM_TX_TYPES; t++) {
+		for (i = 0; i < priv->tx_ring_num[t]; i++) {
+			priv->tx_cq[t][i]->moder_cnt = priv->tx_frames;
+			priv->tx_cq[t][i]->moder_time = priv->tx_usecs;
+			if (priv->port_up) {
+				err = mlx4_en_set_cq_moder(priv,
+							   priv->tx_cq[t][i]);
+				if (err)
+					return err;
+			}
 		}
 	}
 
@@ -336,7 +339,7 @@ static int mlx4_en_get_sset_count(struct net_device *dev, int sset)
 	switch (sset) {
 	case ETH_SS_STATS:
 		return bitmap_iterator_count(&it) +
-			(priv->tx_ring_num * 2) +
+			(priv->tx_ring_num[TX] * 2) +
 			(priv->rx_ring_num * 3);
 	case ETH_SS_TEST:
 		return MLX4_EN_NUM_SELF_TEST - !(priv->mdev->dev->caps.flags
@@ -397,9 +400,9 @@ static void mlx4_en_get_ethtool_stats(struct net_device *dev,
 		if (bitmap_iterator_test(&it))
 			data[index++] = ((unsigned long *)&priv->pkstats)[i];
 
-	for (i = 0; i < priv->tx_ring_num; i++) {
-		data[index++] = priv->tx_ring[i]->packets;
-		data[index++] = priv->tx_ring[i]->bytes;
+	for (i = 0; i < priv->tx_ring_num[TX]; i++) {
+		data[index++] = priv->tx_ring[TX][i]->packets;
+		data[index++] = priv->tx_ring[TX][i]->bytes;
 	}
 	for (i = 0; i < priv->rx_ring_num; i++) {
 		data[index++] = priv->rx_ring[i]->packets;
@@ -467,7 +470,7 @@ static void mlx4_en_get_strings(struct net_device *dev,
 				strcpy(data + (index++) * ETH_GSTRING_LEN,
 				       main_strings[strings]);
 
-		for (i = 0; i < priv->tx_ring_num; i++) {
+		for (i = 0; i < priv->tx_ring_num[TX]; i++) {
 			sprintf(data + (index++) * ETH_GSTRING_LEN,
 				"tx%d_packets", i);
 			sprintf(data + (index++) * ETH_GSTRING_LEN,
@@ -1060,7 +1063,7 @@ static int mlx4_en_set_ringparam(struct net_device *dev,
 
 	if (rx_size == (priv->port_up ? priv->rx_ring[0]->actual_size :
 					priv->rx_ring[0]->size) &&
-	    tx_size == priv->tx_ring[0]->size)
+	    tx_size == priv->tx_ring[TX][0]->size)
 		return 0;
 
 	tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
@@ -1105,7 +1108,7 @@ static void mlx4_en_get_ringparam(struct net_device *dev,
 	param->tx_max_pending = MLX4_EN_MAX_TX_SIZE;
 	param->rx_pending = priv->port_up ?
 		priv->rx_ring[0]->actual_size : priv->rx_ring[0]->size;
-	param->tx_pending = priv->tx_ring[0]->size;
+	param->tx_pending = priv->tx_ring[TX][0]->size;
 }
 
 static u32 mlx4_en_get_rxfh_indir_size(struct net_device *dev)
@@ -1710,7 +1713,7 @@ static void mlx4_en_get_channels(struct net_device *dev,
 	channel->max_tx = MLX4_EN_MAX_TX_RING_P_UP;
 
 	channel->rx_count = priv->rx_ring_num;
-	channel->tx_count = priv->tx_ring_num / MLX4_EN_NUM_UP;
+	channel->tx_count = priv->tx_ring_num[TX] / MLX4_EN_NUM_UP;
 }
 
 static int mlx4_en_set_channels(struct net_device *dev,
@@ -1721,6 +1724,7 @@ static int mlx4_en_set_channels(struct net_device *dev,
 	struct mlx4_en_port_profile new_prof;
 	struct mlx4_en_priv *tmp;
 	int port_up = 0;
+	int xdp_count;
 	int err = 0;
 
 	if (channel->other_count || channel->combined_count ||
@@ -1729,20 +1733,25 @@ static int mlx4_en_set_channels(struct net_device *dev,
 	    !channel->tx_count || !channel->rx_count)
 		return -EINVAL;
 
-	if (channel->tx_count * MLX4_EN_NUM_UP <= priv->xdp_ring_num) {
-		en_err(priv, "Minimum %d tx channels required with XDP on\n",
-		       priv->xdp_ring_num / MLX4_EN_NUM_UP + 1);
-		return -EINVAL;
-	}
-
 	tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
 	if (!tmp)
 		return -ENOMEM;
 
 	mutex_lock(&mdev->state_lock);
+	xdp_count = priv->tx_ring_num[TX_XDP] ? channel->rx_count : 0;
+	if (channel->tx_count * MLX4_EN_NUM_UP + xdp_count > MAX_TX_RINGS) {
+		err = -EINVAL;
+		en_err(priv,
+		       "Total number of TX and XDP rings (%d) exceeds the maximum supported (%d)\n",
+		       channel->tx_count * MLX4_EN_NUM_UP + xdp_count,
+		       MAX_TX_RINGS);
+		goto out;
+	}
+
 	memcpy(&new_prof, priv->prof, sizeof(struct mlx4_en_port_profile));
 	new_prof.num_tx_rings_p_up = channel->tx_count;
-	new_prof.tx_ring_num = channel->tx_count * MLX4_EN_NUM_UP;
+	new_prof.tx_ring_num[TX] = channel->tx_count * MLX4_EN_NUM_UP;
+	new_prof.tx_ring_num[TX_XDP] = xdp_count;
 	new_prof.rx_ring_num = channel->rx_count;
 
 	err = mlx4_en_try_alloc_resources(priv, tmp, &new_prof);
@@ -1756,14 +1765,13 @@ static int mlx4_en_set_channels(struct net_device *dev,
 
 	mlx4_en_safe_replace_resources(priv, tmp);
 
-	netif_set_real_num_tx_queues(dev, priv->tx_ring_num -
-							priv->xdp_ring_num);
+	netif_set_real_num_tx_queues(dev, priv->tx_ring_num[TX]);
 	netif_set_real_num_rx_queues(dev, priv->rx_ring_num);
 
 	if (dev->num_tc)
 		mlx4_en_setup_tc(dev, MLX4_EN_NUM_UP);
 
-	en_warn(priv, "Using %d TX rings\n", priv->tx_ring_num);
+	en_warn(priv, "Using %d TX rings\n", priv->tx_ring_num[TX]);
 	en_warn(priv, "Using %d RX rings\n", priv->rx_ring_num);
 
 	if (port_up) {
@@ -1774,8 +1782,8 @@ static int mlx4_en_set_channels(struct net_device *dev,
 
 	err = mlx4_en_moderation_update(priv);
 out:
-	kfree(tmp);
 	mutex_unlock(&mdev->state_lock);
+	kfree(tmp);
 	return err;
 }
 
@@ -1823,11 +1831,15 @@ static int mlx4_en_set_priv_flags(struct net_device *dev, u32 flags)
 	int ret = 0;
 
 	if (bf_enabled_new != bf_enabled_old) {
+		int t;
+
 		if (bf_enabled_new) {
 			bool bf_supported = true;
 
-			for (i = 0; i < priv->tx_ring_num; i++)
-				bf_supported &= priv->tx_ring[i]->bf_alloced;
+			for (t = 0; t < MLX4_EN_NUM_TX_TYPES; t++)
+				for (i = 0; i < priv->tx_ring_num[t]; i++)
+					bf_supported &=
+						priv->tx_ring[t][i]->bf_alloced;
 
 			if (!bf_supported) {
 				en_err(priv, "BlueFlame is not supported\n");
@@ -1839,8 +1851,10 @@ static int mlx4_en_set_priv_flags(struct net_device *dev, u32 flags)
 			priv->pflags &= ~MLX4_EN_PRIV_FLAGS_BLUEFLAME;
 		}
 
-		for (i = 0; i < priv->tx_ring_num; i++)
-			priv->tx_ring[i]->bf_enabled = bf_enabled_new;
+		for (t = 0; t < MLX4_EN_NUM_TX_TYPES; t++)
+			for (i = 0; i < priv->tx_ring_num[t]; i++)
+				priv->tx_ring[t][i]->bf_enabled =
+					bf_enabled_new;
 
 		en_info(priv, "BlueFlame %s\n",
 			bf_enabled_new ?  "Enabled" : "Disabled");

drivers/net/ethernet/mellanox/mlx4/en_main.c

@@ -169,7 +169,7 @@ static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
 		params->prof[i].tx_ppp = pfctx;
 		params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
 		params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
-		params->prof[i].tx_ring_num = params->num_tx_rings_p_up *
+		params->prof[i].tx_ring_num[TX] = params->num_tx_rings_p_up *
 			MLX4_EN_NUM_UP;
 		params->prof[i].rss_rings = 0;
 		params->prof[i].inline_thold = inline_thold;