mvebu: Add BQL patch for mvneta driver.

This adds the patch submitted to upstream that adds BQL to the mvneta
driver: https://patchwork.kernel.org/patch/9328413/. Helps latency under
load when the physical link is saturated.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>

diff --git a/target/linux/mvebu/patches-4.4/147-net-mvneta-add-BQL-support.patch b/target/linux/mvebu/patches-4.4/147-net-mvneta-add-BQL-support.patch
new file mode 100644 (file)
index 0000000..7bd2593
--- /dev/null
+++ b/target/linux/mvebu/patches-4.4/147-net-mvneta-add-BQL-support.patch
@@ -0,0 +1,83 @@
+--- a/drivers/net/ethernet/marvell/mvneta.c
++++ b/drivers/net/ethernet/marvell/mvneta.c
+@@ -1695,8 +1695,10 @@ static struct mvneta_tx_queue *mvneta_tx
+ 
+ /* Free tx queue skbuffs */
+ static void mvneta_txq_bufs_free(struct mvneta_port *pp,
+-                               struct mvneta_tx_queue *txq, int num)
++                               struct mvneta_tx_queue *txq, int num,
++                               struct netdev_queue *nq)
+ {
++      unsigned int bytes_compl = 0, pkts_compl = 0;
+       int i;
+ 
+       for (i = 0; i < num; i++) {
+@@ -1704,6 +1706,11 @@ static void mvneta_txq_bufs_free(struct
+                       txq->txq_get_index;
+               struct sk_buff *skb = txq->tx_skb[txq->txq_get_index];
+ 
++              if (skb) {
++                      bytes_compl += skb->len;
++                      pkts_compl++;
++              }
++
+               mvneta_txq_inc_get(txq);
+ 
+               if (!IS_TSO_HEADER(txq, tx_desc->buf_phys_addr))
+@@ -1714,6 +1721,8 @@ static void mvneta_txq_bufs_free(struct
+                       continue;
+               dev_kfree_skb_any(skb);
+       }
++
++      netdev_tx_completed_queue(nq, pkts_compl, bytes_compl);
+ }
+ 
+ /* Handle end of transmission */
+@@ -1727,7 +1736,7 @@ static void mvneta_txq_done(struct mvnet
+       if (!tx_done)
+               return;
+ 
+-      mvneta_txq_bufs_free(pp, txq, tx_done);
++      mvneta_txq_bufs_free(pp, txq, tx_done, nq);
+ 
+       txq->count -= tx_done;
+ 
+@@ -2334,6 +2343,8 @@ out:
+               struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
+               struct netdev_queue *nq = netdev_get_tx_queue(dev, txq_id);
+ 
++              netdev_tx_sent_queue(nq, len);
++
+               txq->count += frags;
+               mvneta_txq_pend_desc_add(pp, txq, frags);
+ 
+@@ -2358,9 +2369,10 @@ static void mvneta_txq_done_force(struct
+                                 struct mvneta_tx_queue *txq)
+ 
+ {
++      struct netdev_queue *nq = netdev_get_tx_queue(pp->dev, txq->id);
+       int tx_done = txq->count;
+ 
+-      mvneta_txq_bufs_free(pp, txq, tx_done);
++      mvneta_txq_bufs_free(pp, txq, tx_done, nq);
+ 
+       /* reset txq */
+       txq->count = 0;
+@@ -2841,6 +2853,8 @@ static int mvneta_txq_init(struct mvneta
+ static void mvneta_txq_deinit(struct mvneta_port *pp,
+                             struct mvneta_tx_queue *txq)
+ {
++      struct netdev_queue *nq = netdev_get_tx_queue(pp->dev, txq->id);
++
+       kfree(txq->tx_skb);
+ 
+       if (txq->tso_hdrs)
+@@ -2852,6 +2866,8 @@ static void mvneta_txq_deinit(struct mvn
+                                 txq->size * MVNETA_DESC_ALIGNED_SIZE,
+                                 txq->descs, txq->descs_phys);
+ 
++      netdev_tx_reset_queue(nq);
++
+       txq->descs             = NULL;
+       txq->last_desc         = 0;
+       txq->next_desc_to_proc = 0;