Merge branch 'ibmvnic-performance-improvements-and-other-updates'

Thomas Falcon says:

====================
ibmvnic: Performance improvements and other updates

The first three patches utilize a hypervisor call allowing multiple
TX and RX buffer replenishment descriptors to be sent in one operation,
which significantly reduces hypervisor call overhead. The xmit_more
and Byte Queue Limit API's are leveraged to provide this support
for TX descriptors.

The subsequent two patches remove superfluous code and members in
TX completion handling function and TX buffer structure, respectively,
and remove unused routines.

Finally, four patches which ensure that device queue memory is
cache-line aligned, resolving slowdowns observed in PCI traces,
as well as optimize the driver's NAPI polling function and
to RX buffer replenishment are provided by Dwip Banerjee.

This series provides significant performance improvements, allowing
the driver to fully utilize 100Gb NIC's.
====================

Link: https://lore.kernel.org/r/1605748345-32062-1-git-send-email-tlfalcon@linux.ibm.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/ibm/ibmvnic.c

@@ -84,8 +84,6 @@ static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
 static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
 static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
 static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
-static int send_subcrq(struct ibmvnic_adapter *adapter, u64 remote_handle,
-		       union sub_crq *sub_crq);
 static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
 static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
 static int enable_scrq_irq(struct ibmvnic_adapter *,
@@ -306,9 +304,11 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 	int count = pool->size - atomic_read(&pool->available);
 	u64 handle = adapter->rx_scrq[pool->index]->handle;
 	struct device *dev = &adapter->vdev->dev;
+	struct ibmvnic_ind_xmit_queue *ind_bufp;
+	struct ibmvnic_sub_crq_queue *rx_scrq;
+	union sub_crq *sub_crq;
 	int buffers_added = 0;
 	unsigned long lpar_rc;
-	union sub_crq sub_crq;
 	struct sk_buff *skb;
 	unsigned int offset;
 	dma_addr_t dma_addr;
@@ -320,8 +320,10 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 	if (!pool->active)
 		return;
 
+	rx_scrq = adapter->rx_scrq[pool->index];
+	ind_bufp = &rx_scrq->ind_buf;
 	for (i = 0; i < count; ++i) {
-		skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
+		skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
 		if (!skb) {
 			dev_err(dev, "Couldn't replenish rx buff\n");
 			adapter->replenish_no_mem++;
@@ -346,12 +348,13 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 		pool->rx_buff[index].pool_index = pool->index;
 		pool->rx_buff[index].size = pool->buff_size;
 
-		memset(&sub_crq, 0, sizeof(sub_crq));
-		sub_crq.rx_add.first = IBMVNIC_CRQ_CMD;
-		sub_crq.rx_add.correlator =
+		sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
+		memset(sub_crq, 0, sizeof(*sub_crq));
+		sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
+		sub_crq->rx_add.correlator =
 		    cpu_to_be64((u64)&pool->rx_buff[index]);
-		sub_crq.rx_add.ioba = cpu_to_be32(dma_addr);
-		sub_crq.rx_add.map_id = pool->long_term_buff.map_id;
+		sub_crq->rx_add.ioba = cpu_to_be32(dma_addr);
+		sub_crq->rx_add.map_id = pool->long_term_buff.map_id;
 
 		/* The length field of the sCRQ is defined to be 24 bits so the
 		 * buffer size needs to be left shifted by a byte before it is
@@ -361,15 +364,20 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 #ifdef __LITTLE_ENDIAN__
 		shift = 8;
 #endif
-		sub_crq.rx_add.len = cpu_to_be32(pool->buff_size << shift);
-
-		lpar_rc = send_subcrq(adapter, handle, &sub_crq);
+		sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);
+		pool->next_free = (pool->next_free + 1) % pool->size;
+		if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
+		    i == count - 1) {
+			lpar_rc =
+				send_subcrq_indirect(adapter, handle,
+						     (u64)ind_bufp->indir_dma,
+						     (u64)ind_bufp->index);
 			if (lpar_rc != H_SUCCESS)
 				goto failure;
-
-		buffers_added++;
-		adapter->replenish_add_buff_success++;
-		pool->next_free = (pool->next_free + 1) % pool->size;
+			buffers_added += ind_bufp->index;
+			adapter->replenish_add_buff_success += ind_bufp->index;
+			ind_bufp->index = 0;
+		}
 	}
 	atomic_add(buffers_added, &pool->available);
 	return;
@@ -377,13 +385,20 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 failure:
 	if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
 		dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
+	for (i = ind_bufp->index - 1; i >= 0; --i) {
+		struct ibmvnic_rx_buff *rx_buff;
+
+		pool->next_free = pool->next_free == 0 ?
+				  pool->size - 1 : pool->next_free - 1;
+		sub_crq = &ind_bufp->indir_arr[i];
+		rx_buff = (struct ibmvnic_rx_buff *)
+				be64_to_cpu(sub_crq->rx_add.correlator);
+		index = (int)(rx_buff - pool->rx_buff);
 		pool->free_map[pool->next_free] = index;
+		dev_kfree_skb_any(pool->rx_buff[index].skb);
 		pool->rx_buff[index].skb = NULL;
-
-	dev_kfree_skb_any(skb);
-	adapter->replenish_add_buff_failure++;
-	atomic_add(buffers_added, &pool->available);
-
+	}
+	ind_bufp->index = 0;
 	if (lpar_rc == H_CLOSED || adapter->failover_pending) {
 		/* Disable buffer pool replenishment and report carrier off if
 		 * queue is closed or pending failover.
@@ -483,7 +498,7 @@ static int reset_rx_pools(struct ibmvnic_adapter *adapter)
 
 		if (rx_pool->buff_size != buff_size) {
 			free_long_term_buff(adapter, &rx_pool->long_term_buff);
-			rx_pool->buff_size = buff_size;
+			rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 			rc = alloc_long_term_buff(adapter,
 						  &rx_pool->long_term_buff,
 						  rx_pool->size *
@@ -577,7 +592,7 @@ static int init_rx_pools(struct net_device *netdev)
 
 		rx_pool->size = adapter->req_rx_add_entries_per_subcrq;
 		rx_pool->index = i;
-		rx_pool->buff_size = buff_size;
+		rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 		rx_pool->active = 1;
 
 		rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
@@ -730,6 +745,7 @@ static int init_tx_pools(struct net_device *netdev)
 {
 	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 	int tx_subcrqs;
+	u64 buff_size;
 	int i, rc;
 
 	tx_subcrqs = adapter->num_active_tx_scrqs;
@@ -746,9 +762,11 @@ static int init_tx_pools(struct net_device *netdev)
 	adapter->num_active_tx_pools = tx_subcrqs;
 
 	for (i = 0; i < tx_subcrqs; i++) {
+		buff_size = adapter->req_mtu + VLAN_HLEN;
+		buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 		rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
 				      adapter->req_tx_entries_per_subcrq,
-				      adapter->req_mtu + VLAN_HLEN);
+				      buff_size);
 		if (rc) {
 			release_tx_pools(adapter);
 			return rc;
@@ -1148,6 +1166,7 @@ static int __ibmvnic_open(struct net_device *netdev)
 		if (prev_state == VNIC_CLOSED)
 			enable_irq(adapter->tx_scrq[i]->irq);
 		enable_scrq_irq(adapter, adapter->tx_scrq[i]);
+		netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
 	}
 
 	rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
@@ -1478,17 +1497,18 @@ static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
  * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
  */
 
-static void build_hdr_descs_arr(struct ibmvnic_tx_buff *txbuff,
+static void build_hdr_descs_arr(struct sk_buff *skb,
+				union sub_crq *indir_arr,
 				int *num_entries, u8 hdr_field)
 {
 	int hdr_len[3] = {0, 0, 0};
+	u8 hdr_data[140] = {0};
 	int tot_len;
-	u8 *hdr_data = txbuff->hdr_data;
 
-	tot_len = build_hdr_data(hdr_field, txbuff->skb, hdr_len,
-				 txbuff->hdr_data);
+	tot_len = build_hdr_data(hdr_field, skb, hdr_len,
+				 hdr_data);
 	*num_entries += create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len,
-			 txbuff->indir_arr + 1);
+					 indir_arr + 1);
 }
 
 static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
@@ -1506,17 +1526,95 @@ static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
 	return 0;
 }
 
+static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
+					 struct ibmvnic_sub_crq_queue *tx_scrq)
+{
+	struct ibmvnic_ind_xmit_queue *ind_bufp;
+	struct ibmvnic_tx_buff *tx_buff;
+	struct ibmvnic_tx_pool *tx_pool;
+	union sub_crq tx_scrq_entry;
+	int queue_num;
+	int entries;
+	int index;
+	int i;
+
+	ind_bufp = &tx_scrq->ind_buf;
+	entries = (u64)ind_bufp->index;
+	queue_num = tx_scrq->pool_index;
+
+	for (i = entries - 1; i >= 0; --i) {
+		tx_scrq_entry = ind_bufp->indir_arr[i];
+		if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC)
+			continue;
+		index = be32_to_cpu(tx_scrq_entry.v1.correlator);
+		if (index & IBMVNIC_TSO_POOL_MASK) {
+			tx_pool = &adapter->tso_pool[queue_num];
+			index &= ~IBMVNIC_TSO_POOL_MASK;
+		} else {
+			tx_pool = &adapter->tx_pool[queue_num];
+		}
+		tx_pool->free_map[tx_pool->consumer_index] = index;
+		tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
+					  tx_pool->num_buffers - 1 :
+					  tx_pool->consumer_index - 1;
+		tx_buff = &tx_pool->tx_buff[index];
+		adapter->netdev->stats.tx_packets--;
+		adapter->netdev->stats.tx_bytes -= tx_buff->skb->len;
+		adapter->tx_stats_buffers[queue_num].packets--;
+		adapter->tx_stats_buffers[queue_num].bytes -=
+						tx_buff->skb->len;
+		dev_kfree_skb_any(tx_buff->skb);
+		tx_buff->skb = NULL;
+		adapter->netdev->stats.tx_dropped++;
+	}
+	ind_bufp->index = 0;
+	if (atomic_sub_return(entries, &tx_scrq->used) <=
+	    (adapter->req_tx_entries_per_subcrq / 2) &&
+	    __netif_subqueue_stopped(adapter->netdev, queue_num)) {
+		netif_wake_subqueue(adapter->netdev, queue_num);
+		netdev_dbg(adapter->netdev, "Started queue %d\n",
+			   queue_num);
+	}
+}
+
+static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter,
+				 struct ibmvnic_sub_crq_queue *tx_scrq)
+{
+	struct ibmvnic_ind_xmit_queue *ind_bufp;
+	u64 dma_addr;
+	u64 entries;
+	u64 handle;
+	int rc;
+
+	ind_bufp = &tx_scrq->ind_buf;
+	dma_addr = (u64)ind_bufp->indir_dma;
+	entries = (u64)ind_bufp->index;
+	handle = tx_scrq->handle;
+
+	if (!entries)
+		return 0;
+	rc = send_subcrq_indirect(adapter, handle, dma_addr, entries);
+	if (rc)
+		ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq);
+	else
+		ind_bufp->index = 0;
+	return 0;
+}
+
 static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
 	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 	int queue_num = skb_get_queue_mapping(skb);
 	u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req;
 	struct device *dev = &adapter->vdev->dev;
+	struct ibmvnic_ind_xmit_queue *ind_bufp;
 	struct ibmvnic_tx_buff *tx_buff = NULL;
 	struct ibmvnic_sub_crq_queue *tx_scrq;
 	struct ibmvnic_tx_pool *tx_pool;
 	unsigned int tx_send_failed = 0;
+	netdev_tx_t ret = NETDEV_TX_OK;
 	unsigned int tx_map_failed = 0;
+	union sub_crq indir_arr[16];
 	unsigned int tx_dropped = 0;
 	unsigned int tx_packets = 0;
 	unsigned int tx_bytes = 0;
@@ -1529,8 +1627,10 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 	unsigned char *dst;
 	int index = 0;
 	u8 proto = 0;
-	u64 handle;
-	netdev_tx_t ret = NETDEV_TX_OK;
+
+	tx_scrq = adapter->tx_scrq[queue_num];
+	txq = netdev_get_tx_queue(netdev, queue_num);
+	ind_bufp = &tx_scrq->ind_buf;
 
 	if (test_bit(0, &adapter->resetting)) {
 		if (!netif_subqueue_stopped(netdev, skb))
@@ -1540,6 +1640,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 		tx_send_failed++;
 		tx_dropped++;
 		ret = NETDEV_TX_OK;
+		ibmvnic_tx_scrq_flush(adapter, tx_scrq);
 		goto out;
 	}
 
@@ -1547,6 +1648,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 		tx_dropped++;
 		tx_send_failed++;
 		ret = NETDEV_TX_OK;
+		ibmvnic_tx_scrq_flush(adapter, tx_scrq);
 		goto out;
 	}
 	if (skb_is_gso(skb))
@@ -1554,10 +1656,6 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 	else
 		tx_pool = &adapter->tx_pool[queue_num];
 
-	tx_scrq = adapter->tx_scrq[queue_num];
-	txq = netdev_get_tx_queue(netdev, skb_get_queue_mapping(skb));
-	handle = tx_scrq->handle;
-
 	index = tx_pool->free_map[tx_pool->consumer_index];
 
 	if (index == IBMVNIC_INVALID_MAP) {
@@ -1565,6 +1663,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 		tx_send_failed++;
 		tx_dropped++;
 		ret = NETDEV_TX_OK;
+		ibmvnic_tx_scrq_flush(adapter, tx_scrq);
 		goto out;
 	}
 
@@ -1600,11 +1699,8 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 
 	tx_buff = &tx_pool->tx_buff[index];
 	tx_buff->skb = skb;
-	tx_buff->data_dma[0] = data_dma_addr;
-	tx_buff->data_len[0] = skb->len;
 	tx_buff->index = index;
 	tx_buff->pool_index = queue_num;
-	tx_buff->last_frag = true;
 
 	memset(&tx_crq, 0, sizeof(tx_crq));
 	tx_crq.v1.first = IBMVNIC_CRQ_CMD;
@@ -1649,55 +1745,29 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 		tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
 		hdrs += 2;
 	}
-	/* determine if l2/3/4 headers are sent to firmware */
-	if ((*hdrs >> 7) & 1) {
-		build_hdr_descs_arr(tx_buff, &num_entries, *hdrs);
+
+	if ((*hdrs >> 7) & 1)
+		build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);
+
 	tx_crq.v1.n_crq_elem = num_entries;
 	tx_buff->num_entries = num_entries;
-		tx_buff->indir_arr[0] = tx_crq;
-		tx_buff->indir_dma = dma_map_single(dev, tx_buff->indir_arr,
-						    sizeof(tx_buff->indir_arr),
-						    DMA_TO_DEVICE);
-		if (dma_mapping_error(dev, tx_buff->indir_dma)) {
-			dev_kfree_skb_any(skb);
-			tx_buff->skb = NULL;
-			if (!firmware_has_feature(FW_FEATURE_CMO))
-				dev_err(dev, "tx: unable to map descriptor array\n");
-			tx_map_failed++;
-			tx_dropped++;
-			ret = NETDEV_TX_OK;
-			goto tx_err_out;
-		}
-		lpar_rc = send_subcrq_indirect(adapter, handle,
-					       (u64)tx_buff->indir_dma,
-					       (u64)num_entries);
-		dma_unmap_single(dev, tx_buff->indir_dma,
-				 sizeof(tx_buff->indir_arr), DMA_TO_DEVICE);
-	} else {
-		tx_buff->num_entries = num_entries;
-		lpar_rc = send_subcrq(adapter, handle,
-				      &tx_crq);
-	}
-	if (lpar_rc != H_SUCCESS) {
-		if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
-			dev_err_ratelimited(dev, "tx: send failed\n");
-		dev_kfree_skb_any(skb);
-		tx_buff->skb = NULL;
-
-		if (lpar_rc == H_CLOSED || adapter->failover_pending) {
-			/* Disable TX and report carrier off if queue is closed
-			 * or pending failover.
-			 * Firmware guarantees that a signal will be sent to the
-			 * driver, triggering a reset or some other action.
-			 */
-			netif_tx_stop_all_queues(netdev);
-			netif_carrier_off(netdev);
+	/* flush buffer if current entry can not fit */
+	if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) {
+		lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
+		if (lpar_rc != H_SUCCESS)
+			goto tx_flush_err;
 	}
 
-		tx_send_failed++;
-		tx_dropped++;
-		ret = NETDEV_TX_OK;
-		goto tx_err_out;
+	indir_arr[0] = tx_crq;
+	memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
+	       num_entries * sizeof(struct ibmvnic_generic_scrq));
+	ind_bufp->index += num_entries;
+	if (__netdev_tx_sent_queue(txq, skb->len,
+				   netdev_xmit_more() &&
+				   ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) {
+		lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
+		if (lpar_rc != H_SUCCESS)
+			goto tx_err;
 	}
 
 	if (atomic_add_return(num_entries, &tx_scrq->used)
@@ -1712,14 +1782,26 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 	ret = NETDEV_TX_OK;
 	goto out;
 
-tx_err_out:
-	/* roll back consumer index and map array*/
-	if (tx_pool->consumer_index == 0)
-		tx_pool->consumer_index =
-			tx_pool->num_buffers - 1;
-	else
-		tx_pool->consumer_index--;
-	tx_pool->free_map[tx_pool->consumer_index] = index;
+tx_flush_err:
+	dev_kfree_skb_any(skb);
+	tx_buff->skb = NULL;
+	tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
+				  tx_pool->num_buffers - 1 :
+				  tx_pool->consumer_index - 1;
+	tx_dropped++;
+tx_err:
+	if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
+		dev_err_ratelimited(dev, "tx: send failed\n");
+
+	if (lpar_rc == H_CLOSED || adapter->failover_pending) {
+		/* Disable TX and report carrier off if queue is closed
+		 * or pending failover.
+		 * Firmware guarantees that a signal will be sent to the
+		 * driver, triggering a reset or some other action.
+		 */
+		netif_tx_stop_all_queues(netdev);
+		netif_carrier_off(netdev);
+	}
 out:
 	netdev->stats.tx_dropped += tx_dropped;
 	netdev->stats.tx_bytes += tx_bytes;
@@ -2368,10 +2450,17 @@ static void remove_buff_from_pool(struct ibmvnic_adapter *adapter,
 
 static int ibmvnic_poll(struct napi_struct *napi, int budget)
 {
-	struct net_device *netdev = napi->dev;
-	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
-	int scrq_num = (int)(napi - adapter->napi);
-	int frames_processed = 0;
+	struct ibmvnic_sub_crq_queue *rx_scrq;
+	struct ibmvnic_adapter *adapter;
+	struct net_device *netdev;
+	int frames_processed;
+	int scrq_num;
+
+	netdev = napi->dev;
+	adapter = netdev_priv(netdev);
+	scrq_num = (int)(napi - adapter->napi);
+	frames_processed = 0;
+	rx_scrq = adapter->rx_scrq[scrq_num];
 
 restart_poll:
 	while (frames_processed < budget) {
@@ -2384,14 +2473,14 @@ static int ibmvnic_poll(struct napi_struct *napi, int budget)
 
 		if (unlikely(test_bit(0, &adapter->resetting) &&
 			     adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
-			enable_scrq_irq(adapter, adapter->rx_scrq[scrq_num]);
+			enable_scrq_irq(adapter, rx_scrq);
 			napi_complete_done(napi, frames_processed);
 			return frames_processed;
 		}
 
-		if (!pending_scrq(adapter, adapter->rx_scrq[scrq_num]))
+		if (!pending_scrq(adapter, rx_scrq))
 			break;
-		next = ibmvnic_next_scrq(adapter, adapter->rx_scrq[scrq_num]);
+		next = ibmvnic_next_scrq(adapter, rx_scrq);
 		rx_buff =
 		    (struct ibmvnic_rx_buff *)be64_to_cpu(next->
 							  rx_comp.correlator);
@@ -2448,18 +2537,23 @@ static int ibmvnic_poll(struct napi_struct *napi, int budget)
 		frames_processed++;
 	}
 
-	if (adapter->state != VNIC_CLOSING)
+	if (adapter->state != VNIC_CLOSING &&
+	    ((atomic_read(&adapter->rx_pool[scrq_num].available) <
+	      adapter->req_rx_add_entries_per_subcrq / 2) ||
+	      frames_processed < budget))
 		replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
-
 	if (frames_processed < budget) {
-		enable_scrq_irq(adapter, adapter->rx_scrq[scrq_num]);
-		napi_complete_done(napi, frames_processed);
-		if (pending_scrq(adapter, adapter->rx_scrq[scrq_num]) &&
-		    napi_reschedule(napi)) {
-			disable_scrq_irq(adapter, adapter->rx_scrq[scrq_num]);
+		if (napi_complete_done(napi, frames_processed)) {
+			enable_scrq_irq(adapter, rx_scrq);
+			if (pending_scrq(adapter, rx_scrq)) {
+				rmb();
+				if (napi_reschedule(napi)) {
+					disable_scrq_irq(adapter, rx_scrq);
 					goto restart_poll;
 				}
 			}
+		}
+	}
 	return frames_processed;
 }
 
@@ -2858,6 +2952,7 @@ static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
 	memset(scrq->msgs, 0, 4 * PAGE_SIZE);
 	atomic_set(&scrq->used, 0);
 	scrq->cur = 0;
+	scrq->ind_buf.index = 0;
 
 	rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
 			   4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
@@ -2909,6 +3004,11 @@ static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
 		}
 	}
 
+	dma_free_coherent(dev,
+			  IBMVNIC_IND_ARR_SZ,
+			  scrq->ind_buf.indir_arr,
+			  scrq->ind_buf.indir_dma);
+
 	dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
 			 DMA_BIDIRECTIONAL);
 	free_pages((unsigned long)scrq->msgs, 2);
@@ -2955,6 +3055,17 @@ static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
 
 	scrq->adapter = adapter;
 	scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs);
+	scrq->ind_buf.index = 0;
+
+	scrq->ind_buf.indir_arr =
+		dma_alloc_coherent(dev,
+				   IBMVNIC_IND_ARR_SZ,
+				   &scrq->ind_buf.indir_dma,
+				   GFP_KERNEL);
+
+	if (!scrq->ind_buf.indir_arr)
+		goto indir_failed;
+
 	spin_lock_init(&scrq->lock);
 
 	netdev_dbg(adapter->netdev,
@@ -2963,6 +3074,12 @@ static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
 
 	return scrq;
 
+indir_failed:
+	do {
+		rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
+					adapter->vdev->unit_address,
+					scrq->crq_num);
+	} while (rc == H_BUSY || rc == H_IS_LONG_BUSY(rc));
 reg_failed:
 	dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
 			 DMA_BIDIRECTIONAL);
@@ -3077,14 +3194,17 @@ static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
 	struct device *dev = &adapter->vdev->dev;
 	struct ibmvnic_tx_pool *tx_pool;
 	struct ibmvnic_tx_buff *txbuff;
+	struct netdev_queue *txq;
 	union sub_crq *next;
 	int index;
-	int i, j;
+	int i;
 
 restart_loop:
 	while (pending_scrq(adapter, scrq)) {
 		unsigned int pool = scrq->pool_index;
 		int num_entries = 0;
+		int total_bytes = 0;
+		int num_packets = 0;
 
 		next = ibmvnic_next_scrq(adapter, scrq);
 		for (i = 0; i < next->tx_comp.num_comps; i++) {
@@ -3102,21 +3222,16 @@ static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
 			}
 
 			txbuff = &tx_pool->tx_buff[index];
-
-			for (j = 0; j < IBMVNIC_MAX_FRAGS_PER_CRQ; j++) {
-				if (!txbuff->data_dma[j])
-					continue;
-
-				txbuff->data_dma[j] = 0;
-			}
-
-			if (txbuff->last_frag) {
-				dev_kfree_skb_any(txbuff->skb);
+			num_packets++;
+			num_entries += txbuff->num_entries;
+			if (txbuff->skb) {
+				total_bytes += txbuff->skb->len;
+				dev_consume_skb_irq(txbuff->skb);
 				txbuff->skb = NULL;
+			} else {
+				netdev_warn(adapter->netdev,
+					    "TX completion received with NULL socket buffer\n");
 			}
-
-			num_entries += txbuff->num_entries;
-
 			tx_pool->free_map[tx_pool->producer_index] = index;
 			tx_pool->producer_index =
 				(tx_pool->producer_index + 1) %
@@ -3125,6 +3240,9 @@ static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
 		/* remove tx_comp scrq*/
 		next->tx_comp.first = 0;
 
+		txq = netdev_get_tx_queue(adapter->netdev, scrq->pool_index);
+		netdev_tx_completed_queue(txq, num_packets, total_bytes);
+
 		if (atomic_sub_return(num_entries, &scrq->used) <=
 		    (adapter->req_tx_entries_per_subcrq / 2) &&
 		    __netif_subqueue_stopped(adapter->netdev,
@@ -3524,38 +3642,6 @@ static void print_subcrq_error(struct device *dev, int rc, const char *func)
 	}
 }
 
-static int send_subcrq(struct ibmvnic_adapter *adapter, u64 remote_handle,
-		       union sub_crq *sub_crq)
-{
-	unsigned int ua = adapter->vdev->unit_address;
-	struct device *dev = &adapter->vdev->dev;
-	u64 *u64_crq = (u64 *)sub_crq;
-	int rc;
-
-	netdev_dbg(adapter->netdev,
-		   "Sending sCRQ %016lx: %016lx %016lx %016lx %016lx\n",
-		   (unsigned long int)cpu_to_be64(remote_handle),
-		   (unsigned long int)cpu_to_be64(u64_crq[0]),
-		   (unsigned long int)cpu_to_be64(u64_crq[1]),
-		   (unsigned long int)cpu_to_be64(u64_crq[2]),
-		   (unsigned long int)cpu_to_be64(u64_crq[3]));
-
-	/* Make sure the hypervisor sees the complete request */
-	mb();
-
-	rc = plpar_hcall_norets(H_SEND_SUB_CRQ, ua,
-				cpu_to_be64(remote_handle),
-				cpu_to_be64(u64_crq[0]),
-				cpu_to_be64(u64_crq[1]),
-				cpu_to_be64(u64_crq[2]),
-				cpu_to_be64(u64_crq[3]));
-
-	if (rc)
-		print_subcrq_error(dev, rc, __func__);
-
-	return rc;
-}
-
 static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
 				u64 remote_handle, u64 ioba, u64 num_entries)
 {

drivers/net/ethernet/ibm/ibmvnic.h

@@ -31,6 +31,8 @@
 #define IBMVNIC_BUFFS_PER_POOL	100
 #define IBMVNIC_MAX_QUEUES	16
 #define IBMVNIC_MAX_QUEUE_SZ   4096
+#define IBMVNIC_MAX_IND_DESCS  128
+#define IBMVNIC_IND_ARR_SZ	(IBMVNIC_MAX_IND_DESCS * 32)
 
 #define IBMVNIC_TSO_BUF_SZ	65536
 #define IBMVNIC_TSO_BUFS	64
@@ -224,8 +226,6 @@ struct ibmvnic_tx_comp_desc {
 #define IBMVNIC_TCP_CHKSUM		0x20
 #define IBMVNIC_UDP_CHKSUM		0x08
 
-#define IBMVNIC_MAX_FRAGS_PER_CRQ 3
-
 struct ibmvnic_tx_desc {
 	u8 first;
 	u8 type;
@@ -861,6 +861,12 @@ union sub_crq {
 	struct ibmvnic_rx_buff_add_desc rx_add;
 };
 
+struct ibmvnic_ind_xmit_queue {
+	union sub_crq *indir_arr;
+	dma_addr_t indir_dma;
+	int index;
+};
+
 struct ibmvnic_sub_crq_queue {
 	union sub_crq *msgs;
 	int size, cur;
@@ -873,10 +879,11 @@ struct ibmvnic_sub_crq_queue {
 	spinlock_t lock;
 	struct sk_buff *rx_skb_top;
 	struct ibmvnic_adapter *adapter;
+	struct ibmvnic_ind_xmit_queue ind_buf;
 	atomic_t used;
 	char name[32];
 	u64 handle;
-};
+} ____cacheline_aligned;
 
 struct ibmvnic_long_term_buff {
 	unsigned char *buff;
@@ -887,14 +894,8 @@ struct ibmvnic_long_term_buff {
 
 struct ibmvnic_tx_buff {
 	struct sk_buff *skb;
-	dma_addr_t data_dma[IBMVNIC_MAX_FRAGS_PER_CRQ];
-	unsigned int data_len[IBMVNIC_MAX_FRAGS_PER_CRQ];
 	int index;
 	int pool_index;
-	bool last_frag;
-	union sub_crq indir_arr[6];
-	u8 hdr_data[140];
-	dma_addr_t indir_dma;
 	int num_entries;
 };
 
@@ -906,7 +907,7 @@ struct ibmvnic_tx_pool {
 	struct ibmvnic_long_term_buff long_term_buff;
 	int num_buffers;
 	int buf_size;
-};
+} ____cacheline_aligned;
 
 struct ibmvnic_rx_buff {
 	struct sk_buff *skb;
@@ -927,7 +928,7 @@ struct ibmvnic_rx_pool {
 	int next_alloc;
 	int active;
 	struct ibmvnic_long_term_buff long_term_buff;
-};
+} ____cacheline_aligned;
 
 struct ibmvnic_vpd {
 	unsigned char *buff;
@@ -1014,8 +1015,8 @@ struct ibmvnic_adapter {
 	atomic_t running_cap_crqs;
 	bool wait_capability;
 
-	struct ibmvnic_sub_crq_queue **tx_scrq;
-	struct ibmvnic_sub_crq_queue **rx_scrq;
+	struct ibmvnic_sub_crq_queue **tx_scrq ____cacheline_aligned;
+	struct ibmvnic_sub_crq_queue **rx_scrq ____cacheline_aligned;
 
 	/* rx structs */
 	struct napi_struct *napi;