mlx4_en: multiqueue support
By default the driver opens 8 TX queues (defined by MLX4_EN_NUM_TX_RINGS).
If the driver is configured to support Per Priority Flow Control, we open
8 additional TX rings.
dev->real_num_tx_queues is always set to be MLX4_EN_NUM_TX_RINGS.
The mlx4_en_select_queue() function uses standard hashing (skb_tx_hash)
in case that PPFC is not supported or the skb contain a vlan tag,
otherwise the queue is selected according to vlan priority.
Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/mlx4/en_tx.c b/drivers/net/mlx4/en_tx.c
index 95703f9..3719d1a 100644
--- a/drivers/net/mlx4/en_tx.c
+++ b/drivers/net/mlx4/en_tx.c
@@ -297,34 +297,6 @@
return cnt;
}
-void mlx4_en_set_prio_map(struct mlx4_en_priv *priv, u16 *prio_map, u32 ring_num)
-{
- int block = 8 / ring_num;
- int extra = 8 - (block * ring_num);
- int num = 0;
- u16 ring = 1;
- int prio;
-
- if (ring_num == 1) {
- for (prio = 0; prio < 8; prio++)
- prio_map[prio] = 0;
- return;
- }
-
- for (prio = 0; prio < 8; prio++) {
- if (extra && (num == block + 1)) {
- ring++;
- num = 0;
- extra--;
- } else if (!extra && (num == block)) {
- ring++;
- num = 0;
- }
- prio_map[prio] = ring;
- en_dbg(DRV, priv, " prio:%d --> ring:%d\n", prio, ring);
- num++;
- }
-}
static void mlx4_en_process_tx_cq(struct net_device *dev, struct mlx4_en_cq *cq)
{
@@ -386,18 +358,8 @@
if (unlikely(ring->blocked)) {
if ((u32) (ring->prod - ring->cons) <=
ring->size - HEADROOM - MAX_DESC_TXBBS) {
-
- /* TODO: support multiqueue netdevs. Currently, we block
- * when *any* ring is full. Note that:
- * - 2 Tx rings can unblock at the same time and call
- * netif_wake_queue(), which is OK since this
- * operation is idempotent.
- * - We might wake the queue just after another ring
- * stopped it. This is no big deal because the next
- * transmission on that ring would stop the queue.
- */
ring->blocked = 0;
- netif_wake_queue(dev);
+ netif_tx_wake_queue(netdev_get_tx_queue(dev, cq->ring));
priv->port_stats.wake_queue++;
}
}
@@ -616,21 +578,20 @@
tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f;
}
-static int get_vlan_info(struct mlx4_en_priv *priv, struct sk_buff *skb,
- u16 *vlan_tag)
+u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb)
{
- int tx_ind;
+ struct mlx4_en_priv *priv = netdev_priv(dev);
+ u16 vlan_tag = 0;
- /* Obtain VLAN information if present */
- if (priv->vlgrp && vlan_tx_tag_present(skb)) {
- *vlan_tag = vlan_tx_tag_get(skb);
- /* Set the Tx ring to use according to vlan priority */
- tx_ind = priv->tx_prio_map[*vlan_tag >> 13];
- } else {
- *vlan_tag = 0;
- tx_ind = 0;
+ /* If we support per priority flow control and the packet contains
+ * a vlan tag, send the packet to the TX ring assigned to that priority
+ */
+ if (priv->prof->rx_ppp && priv->vlgrp && vlan_tx_tag_present(skb)) {
+ vlan_tag = vlan_tx_tag_get(skb);
+ return MLX4_EN_NUM_TX_RINGS + (vlan_tag >> 13);
}
- return tx_ind;
+
+ return skb_tx_hash(dev, skb);
}
int mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
@@ -650,7 +611,7 @@
dma_addr_t dma;
u32 index;
__be32 op_own;
- u16 vlan_tag;
+ u16 vlan_tag = 0;
int i;
int lso_header_size;
void *fragptr;
@@ -673,15 +634,16 @@
return NETDEV_TX_OK;
}
- tx_ind = get_vlan_info(priv, skb, &vlan_tag);
+ tx_ind = skb->queue_mapping;
ring = &priv->tx_ring[tx_ind];
+ if (priv->vlgrp && vlan_tx_tag_present(skb))
+ vlan_tag = vlan_tx_tag_get(skb);
/* Check available TXBBs And 2K spare for prefetch */
if (unlikely(((int)(ring->prod - ring->cons)) >
ring->size - HEADROOM - MAX_DESC_TXBBS)) {
- /* every full Tx ring stops queue.
- * TODO: implement multi-queue support (per-queue stop) */
- netif_stop_queue(dev);
+ /* every full Tx ring stops queue */
+ netif_tx_stop_queue(netdev_get_tx_queue(dev, tx_ind));
ring->blocked = 1;
priv->port_stats.queue_stopped++;