Merge branch 'mlx4-XDP-tx-refactor'

Tariq Toukan says:

====================
mlx4 XDP TX refactor

This patchset refactors the XDP forwarding case, so that
its dedicated transmit queues are managed in a complete
separation from the other regular ones.

It also adds ethtool counters for XDP cases.

Series generated against net-next commit:
22ca904a genetlink: fix error return code in genl_register_family()

Thanks,
Tariq.

v3:
* Exposed per ring counters.

v2:
* Added ethtool counters.
* Rebased, now patch 2 reverts Brenden's fix, as the bug no longer exists:
  958b3d39 ("net/mlx4_en: fixup xdp tx irq to match rx")
* Updated commit message of patch 2.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -65,7 +65,7 @@ int mlx4_en_create_cq(struct mlx4_en_priv *priv,
 	cq->buf_size = cq->size * mdev->dev->caps.cqe_size;
 
 	cq->ring = ring;
-	cq->is_tx = mode;
+	cq->type = mode;
 	cq->vector = mdev->dev->caps.num_comp_vectors;
 
 	/* Allocate HW buffers on provided NUMA node.
@@ -104,7 +104,7 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
 	*cq->mcq.arm_db    = 0;
 	memset(cq->buf, 0, cq->buf_size);
 
-	if (cq->is_tx == RX) {
+	if (cq->type == RX) {
 		if (!mlx4_is_eq_vector_valid(mdev->dev, priv->port,
 					     cq->vector)) {
 			cq->vector = cpumask_first(priv->rx_ring[cq->ring]->affinity_mask);
@@ -127,25 +127,17 @@ 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;
 	}
 
-	if (!cq->is_tx)
+	if (cq->type == RX)
 		cq->size = priv->rx_ring[cq->ring]->actual_size;
 
-	if ((cq->is_tx && priv->hwtstamp_config.tx_type) ||
-	    (!cq->is_tx && priv->hwtstamp_config.rx_filter))
+	if ((cq->type != RX && priv->hwtstamp_config.tx_type) ||
+	    (cq->type == RX && priv->hwtstamp_config.rx_filter))
 		timestamp_en = 1;
 
 	err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt,
@@ -154,10 +146,10 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
 	if (err)
 		goto free_eq;
 
-	cq->mcq.comp  = cq->is_tx ? mlx4_en_tx_irq : mlx4_en_rx_irq;
+	cq->mcq.comp  = cq->type != RX ? mlx4_en_tx_irq : mlx4_en_rx_irq;
 	cq->mcq.event = mlx4_en_cq_event;
 
-	if (cq->is_tx)
+	if (cq->type != RX)
 		netif_tx_napi_add(cq->dev, &cq->napi, mlx4_en_poll_tx_cq,
 				  NAPI_POLL_WEIGHT);
 	else
@@ -181,7 +173,7 @@ void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq)
 
 	mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
 	if (mlx4_is_eq_vector_valid(mdev->dev, priv->port, cq->vector) &&
-	    cq->is_tx == RX)
+	    cq->type == RX)
 		mlx4_release_eq(priv->mdev->dev, cq->vector);
 	cq->vector = 0;
 	cq->buf_size = 0;
@@ -193,7 +185,7 @@ void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq)
 void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 {
 	napi_disable(&cq->napi);
-	if (!cq->is_tx) {
+	if (cq->type == RX) {
 		napi_hash_del(&cq->napi);
 		synchronize_rcu();
 	}

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;
+			}
 		}
 	}
 
@@ -192,6 +195,10 @@ static const char main_strings[][ETH_GSTRING_LEN] = {
 	"tx_prio_7_packets", "tx_prio_7_bytes",
 	"tx_novlan_packets", "tx_novlan_bytes",
 
+	/* xdp statistics */
+	"rx_xdp_drop",
+	"rx_xdp_tx",
+	"rx_xdp_tx_full",
 };
 
 static const char mlx4_en_test_names[][ETH_GSTRING_LEN]= {
@@ -336,8 +343,8 @@ 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->rx_ring_num * 3);
+			(priv->tx_ring_num[TX] * 2) +
+			(priv->rx_ring_num * (3 + NUM_XDP_STATS));
 	case ETH_SS_TEST:
 		return MLX4_EN_NUM_SELF_TEST - !(priv->mdev->dev->caps.flags
 					& MLX4_DEV_CAP_FLAG_UC_LOOPBACK) * 2;
@@ -397,14 +404,21 @@ 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 < NUM_XDP_STATS; i++, bitmap_iterator_inc(&it))
+		if (bitmap_iterator_test(&it))
+			data[index++] = ((unsigned long *)&priv->xdp_stats)[i];
+
+	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;
 		data[index++] = priv->rx_ring[i]->bytes;
 		data[index++] = priv->rx_ring[i]->dropped;
+		data[index++] = priv->rx_ring[i]->xdp_drop;
+		data[index++] = priv->rx_ring[i]->xdp_tx;
+		data[index++] = priv->rx_ring[i]->xdp_tx_full;
 	}
 	spin_unlock_bh(&priv->stats_lock);
 
@@ -467,7 +481,13 @@ 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 < NUM_XDP_STATS; i++, strings++,
+		     bitmap_iterator_inc(&it))
+			if (bitmap_iterator_test(&it))
+				strcpy(data + (index++) * ETH_GSTRING_LEN,
+				       main_strings[strings]);
+
+		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,
@@ -480,6 +500,12 @@ static void mlx4_en_get_strings(struct net_device *dev,
 				"rx%d_bytes", i);
 			sprintf(data + (index++) * ETH_GSTRING_LEN,
 				"rx%d_dropped", i);
+			sprintf(data + (index++) * ETH_GSTRING_LEN,
+				"rx%d_xdp_drop", i);
+			sprintf(data + (index++) * ETH_GSTRING_LEN,
+				"rx%d_xdp_tx", i);
+			sprintf(data + (index++) * ETH_GSTRING_LEN,
+				"rx%d_xdp_tx_full", i);
 		}
 		break;
 	case ETH_SS_PRIV_FLAGS:
@@ -1060,7 +1086,7 @@ 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 +1131,7 @@ 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 +1736,7 @@ 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 +1747,7 @@ 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 +1756,25 @@ 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 +1788,13 @@ 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 +1805,8 @@ 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 +1854,15 @@ 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 +1874,10 @@ 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;

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

@@ -179,6 +179,9 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
 	priv->port_stats.rx_chksum_good = 0;
 	priv->port_stats.rx_chksum_none = 0;
 	priv->port_stats.rx_chksum_complete = 0;
+	priv->xdp_stats.rx_xdp_drop    = 0;
+	priv->xdp_stats.rx_xdp_tx      = 0;
+	priv->xdp_stats.rx_xdp_tx_full = 0;
 	for (i = 0; i < priv->rx_ring_num; i++) {
 		stats->rx_packets += priv->rx_ring[i]->packets;
 		stats->rx_bytes += priv->rx_ring[i]->bytes;
@@ -186,6 +189,9 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
 		priv->port_stats.rx_chksum_good += priv->rx_ring[i]->csum_ok;
 		priv->port_stats.rx_chksum_none += priv->rx_ring[i]->csum_none;
 		priv->port_stats.rx_chksum_complete += priv->rx_ring[i]->csum_complete;
+		priv->xdp_stats.rx_xdp_drop    += priv->rx_ring[i]->xdp_drop;
+		priv->xdp_stats.rx_xdp_tx      += priv->rx_ring[i]->xdp_tx;
+		priv->xdp_stats.rx_xdp_tx_full += priv->rx_ring[i]->xdp_tx_full;
 	}
 	stats->tx_packets = 0;
 	stats->tx_bytes = 0;
@@ -196,8 +202,8 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
 	priv->port_stats.tso_packets = 0;
 	priv->port_stats.xmit_more = 0;
 
-	for (i = 0; i < priv->tx_ring_num; i++) {
-		const struct mlx4_en_tx_ring *ring = priv->tx_ring[i];
+	for (i = 0; i < priv->tx_ring_num[TX]; i++) {
+		const struct mlx4_en_tx_ring *ring = priv->tx_ring[TX][i];
 
 		stats->tx_packets += ring->packets;
 		stats->tx_bytes += ring->bytes;

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

@@ -788,7 +788,6 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 	struct bpf_prog *xdp_prog;
 	int doorbell_pending;
 	struct sk_buff *skb;
-	int tx_index;
 	int index;
 	int nr;
 	unsigned int length;
@@ -808,7 +807,6 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 	rcu_read_lock();
 	xdp_prog = rcu_dereference(ring->xdp_prog);
 	doorbell_pending = 0;
-	tx_index = (priv->tx_ring_num - priv->xdp_ring_num) + cq->ring;
 
 	/* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 	 * descriptor offset can be deduced from the CQE index instead of
@@ -877,8 +875,6 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 		 */
 		length = be32_to_cpu(cqe->byte_cnt);
 		length -= ring->fcs_del;
-		ring->bytes += length;
-		ring->packets++;
 		l2_tunnel = (dev->hw_enc_features & NETIF_F_RXCSUM) &&
 			(cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_L2_TUNNEL));
 
@@ -904,22 +900,26 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 			case XDP_PASS:
 				break;
 			case XDP_TX:
-				if (likely(!mlx4_en_xmit_frame(frags, dev,
-							length, tx_index,
+				if (likely(!mlx4_en_xmit_frame(ring, frags, dev,
+							length, cq->ring,
 							&doorbell_pending)))
 					goto consumed;
-				goto xdp_drop; /* Drop on xmit failure */
+				goto xdp_drop_no_cnt; /* Drop on xmit failure */
 			default:
 				bpf_warn_invalid_xdp_action(act);
 			case XDP_ABORTED:
 			case XDP_DROP:
-xdp_drop:
+				ring->xdp_drop++;
+xdp_drop_no_cnt:
 				if (likely(mlx4_en_rx_recycle(ring, frags)))
 					goto consumed;
 				goto next;
 			}
 		}
 
+		ring->bytes += length;
+		ring->packets++;
+
 		if (likely(dev->features & NETIF_F_RXCSUM)) {
 			if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_TCP |
 						      MLX4_CQE_STATUS_UDP)) {
@@ -1082,7 +1082,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 out:
 	rcu_read_unlock();
 	if (doorbell_pending)
-		mlx4_en_xmit_doorbell(priv->tx_ring[tx_index]);
+		mlx4_en_xmit_doorbell(priv->tx_ring[TX_XDP][cq->ring]);
 
 	AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 	mlx4_cq_set_ci(&cq->mcq);
@@ -1162,7 +1162,7 @@ void mlx4_en_calc_rx_buf(struct net_device *dev)
 	/* bpf requires buffers to be set up as 1 packet per page.
 	 * This only works when num_frags == 1.
 	 */
-	if (priv->xdp_ring_num) {
+	if (priv->tx_ring_num[TX_XDP]) {
 		dma_dir = PCI_DMA_BIDIRECTIONAL;
 		/* This will gain efficient xdp frame recycling at the expense
 		 * of more costly truesize accounting

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

@@ -392,7 +392,8 @@ int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
 		cnt++;
 	}
 
-	netdev_tx_reset_queue(ring->tx_queue);
+	if (ring->tx_queue)
+		netdev_tx_reset_queue(ring->tx_queue);
 
 	if (cnt)
 		en_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt);
@@ -405,7 +406,7 @@ static bool mlx4_en_process_tx_cq(struct net_device *dev,
 {
 	struct mlx4_en_priv *priv = netdev_priv(dev);
 	struct mlx4_cq *mcq = &cq->mcq;
-	struct mlx4_en_tx_ring *ring = priv->tx_ring[cq->ring];
+	struct mlx4_en_tx_ring *ring = priv->tx_ring[cq->type][cq->ring];
 	struct mlx4_cqe *cqe;
 	u16 index;
 	u16 new_index, ring_index, stamp_index;
@@ -807,7 +808,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
 	bool bf_ok;
 
 	tx_ind = skb_get_queue_mapping(skb);
-	ring = priv->tx_ring[tx_ind];
+	ring = priv->tx_ring[TX][tx_ind];
 
 	if (!priv->port_up)
 		goto tx_drop;
@@ -1078,7 +1079,8 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
 	return NETDEV_TX_OK;
 }
 
-netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
+netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring,
+			       struct mlx4_en_rx_alloc *frame,
 			       struct net_device *dev, unsigned int length,
 			       int tx_ind, int *doorbell_pending)
 {
@@ -1101,7 +1103,7 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
 	BUILD_BUG_ON_MSG(ALIGN(CTRL_SIZE + DS_SIZE, TXBB_SIZE) != TXBB_SIZE,
 			 "mlx4_en_xmit_frame requires minimum size tx desc");
 
-	ring = priv->tx_ring[tx_ind];
+	ring = priv->tx_ring[TX_XDP][tx_ind];
 
 	if (!priv->port_up)
 		goto tx_drop;
@@ -1153,8 +1155,7 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
 		((ring->prod & ring->size) ?
 		 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
 
-	ring->packets++;
-	ring->bytes += tx_info->nr_bytes;
+	rx_ring->xdp_tx++;
 	AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, length);
 
 	ring->prod += nr_txbb;
@@ -1178,7 +1179,7 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
 	return NETDEV_TX_OK;
 
 tx_drop_count:
-	ring->tx_dropped++;
+	rx_ring->xdp_tx_full++;
 tx_drop:
 	return NETDEV_TX_BUSY;
 }

drivers/net/ethernet/mellanox/mlx4/mlx4_en.h

@@ -207,8 +207,11 @@ enum {
  */
 
 enum cq_type {
-	RX = 0,
-	TX = 1,
+	/* keep tx types first */
+	TX,
+	TX_XDP,
+#define MLX4_EN_NUM_TX_TYPES (TX_XDP + 1)
+	RX,
 };
 
 
@@ -347,6 +350,9 @@ struct mlx4_en_rx_ring {
 	unsigned long csum_ok;
 	unsigned long csum_none;
 	unsigned long csum_complete;
+	unsigned long xdp_drop;
+	unsigned long xdp_tx;
+	unsigned long xdp_tx_full;
 	unsigned long dropped;
 	int hwtstamp_rx_filter;
 	cpumask_var_t affinity_mask;
@@ -361,7 +367,7 @@ struct mlx4_en_cq {
 	int size;
 	int buf_size;
 	int vector;
-	enum cq_type is_tx;
+	enum cq_type type;
 	u16 moder_time;
 	u16 moder_cnt;
 	struct mlx4_cqe *buf;
@@ -372,7 +378,7 @@ struct mlx4_en_cq {
 
 struct mlx4_en_port_profile {
 	u32 flags;
-	u32 tx_ring_num;
+	u32 tx_ring_num[MLX4_EN_NUM_TX_TYPES];
 	u32 rx_ring_num;
 	u32 tx_ring_size;
 	u32 rx_ring_size;
@@ -569,17 +575,16 @@ struct mlx4_en_priv {
 	u32 flags;
 	u8 num_tx_rings_p_up;
 	u32 tx_work_limit;
-	u32 tx_ring_num;
+	u32 tx_ring_num[MLX4_EN_NUM_TX_TYPES];
 	u32 rx_ring_num;
 	u32 rx_skb_size;
 	struct mlx4_en_frag_info frag_info[MLX4_EN_MAX_RX_FRAGS];
 	u16 num_frags;
 	u16 log_rx_info;
-	int xdp_ring_num;
 
-	struct mlx4_en_tx_ring **tx_ring;
+	struct mlx4_en_tx_ring **tx_ring[MLX4_EN_NUM_TX_TYPES];
 	struct mlx4_en_rx_ring *rx_ring[MAX_RX_RINGS];
-	struct mlx4_en_cq **tx_cq;
+	struct mlx4_en_cq **tx_cq[MLX4_EN_NUM_TX_TYPES];
 	struct mlx4_en_cq *rx_cq[MAX_RX_RINGS];
 	struct mlx4_qp drop_qp;
 	struct work_struct rx_mode_task;
@@ -597,6 +602,7 @@ struct mlx4_en_priv {
 	struct mlx4_en_flow_stats_rx rx_flowstats;
 	struct mlx4_en_flow_stats_tx tx_flowstats;
 	struct mlx4_en_port_stats port_stats;
+	struct mlx4_en_xdp_stats xdp_stats;
 	struct mlx4_en_stats_bitmap stats_bitmap;
 	struct list_head mc_list;
 	struct list_head curr_list;
@@ -685,7 +691,8 @@ void mlx4_en_tx_irq(struct mlx4_cq *mcq);
 u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb,
 			 void *accel_priv, select_queue_fallback_t fallback);
 netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev);
-netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
+netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring,
+			       struct mlx4_en_rx_alloc *frame,
 			       struct net_device *dev, unsigned int length,
 			       int tx_ind, int *doorbell_pending);
 void mlx4_en_xmit_doorbell(struct mlx4_en_tx_ring *ring);

drivers/net/ethernet/mellanox/mlx4/mlx4_stats.h

@@ -55,6 +55,13 @@ struct mlx4_en_perf_stats {
 #define NUM_PERF_COUNTERS		6
 };
 
+struct mlx4_en_xdp_stats {
+	unsigned long rx_xdp_drop;
+	unsigned long rx_xdp_tx;
+	unsigned long rx_xdp_tx_full;
+#define NUM_XDP_STATS		3
+};
+
 #define NUM_MAIN_STATS	21
 
 #define MLX4_NUM_PRIORITIES	8
@@ -107,7 +114,8 @@ enum {
 };
 
 #define NUM_ALL_STATS	(NUM_MAIN_STATS + NUM_PORT_STATS + NUM_PKT_STATS + \
-			 NUM_FLOW_STATS + NUM_PERF_STATS + NUM_PF_STATS)
+			 NUM_FLOW_STATS + NUM_PERF_STATS + NUM_PF_STATS + \
+			 NUM_XDP_STATS)
 
 #define MLX4_FIND_NETDEV_STAT(n) (offsetof(struct net_device_stats, n) / \
 				  sizeof(((struct net_device_stats *)0)->n))