bna: TX Queue Depth Fix

sk_buff unmap_array grows greater than 65536 (x2) with Tx ring of 65536.
Reducing TXQ depth and safe(max) acking of Tx events to 32768 (same as Rx).
Add defines for TX and RX queue depths.

Signed-off-by: Gurunatha Karaje <gkaraje@brocade.com>
Signed-off-by: Rasesh Mody <rmody@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 8 insertions, 4 deletions

diff --git a/drivers/net/ethernet/brocade/bna/bnad.h b/drivers/net/ethernet/brocade/bna/bnad.h
index 0c9d736a15de..6c42c1441679 100644
--- a/drivers/net/ethernet/brocade/bna/bnad.h
+++ b/drivers/net/ethernet/brocade/bna/bnad.h
@@ -86,6 +86,10 @@ struct bnad_rx_ctrl {
 #define BNAD_MAX_Q_DEPTH                0x10000
 #define BNAD_MIN_Q_DEPTH                0x200
 
+#define BNAD_MAX_RXQ_DEPTH              (BNAD_MAX_Q_DEPTH / bnad_rxqs_per_cq)
+/* keeping MAX TX and RX Q depth equal */
+#define BNAD_MAX_TXQ_DEPTH              BNAD_MAX_RXQ_DEPTH
+
 #define BNAD_JUMBO_MTU                  9000
 
 #define BNAD_NETIF_WAKE_THRESHOLD       8
diff --git a/drivers/net/ethernet/brocade/bna/bnad_ethtool.c b/drivers/net/ethernet/brocade/bna/bnad_ethtool.c
index 96ff7001a1a2..48422244397c 100644
--- a/drivers/net/ethernet/brocade/bna/bnad_ethtool.c
+++ b/drivers/net/ethernet/brocade/bna/bnad_ethtool.c
@@ -418,10 +418,10 @@ bnad_get_ringparam(struct net_device *netdev,
 {
         struct bnad *bnad = netdev_priv(netdev);
 
-        ringparam->rx_max_pending = BNAD_MAX_Q_DEPTH / bnad_rxqs_per_cq;
+        ringparam->rx_max_pending = BNAD_MAX_RXQ_DEPTH;
         ringparam->rx_mini_max_pending = 0;
         ringparam->rx_jumbo_max_pending = 0;
-        ringparam->tx_max_pending = BNAD_MAX_Q_DEPTH;
+        ringparam->tx_max_pending = BNAD_MAX_TXQ_DEPTH;
 
         ringparam->rx_pending = bnad->rxq_depth;
         ringparam->rx_mini_max_pending = 0;
@@ -445,13 +445,13 @@ bnad_set_ringparam(struct net_device *netdev,
         }
 
         if (ringparam->rx_pending < BNAD_MIN_Q_DEPTH ||
-            ringparam->rx_pending > BNAD_MAX_Q_DEPTH / bnad_rxqs_per_cq ||
+            ringparam->rx_pending > BNAD_MAX_RXQ_DEPTH ||
             !BNA_POWER_OF_2(ringparam->rx_pending)) {
                 mutex_unlock(&bnad->conf_mutex);
                 return -EINVAL;
         }
         if (ringparam->tx_pending < BNAD_MIN_Q_DEPTH ||
-            ringparam->tx_pending > BNAD_MAX_Q_DEPTH ||
+            ringparam->tx_pending > BNAD_MAX_TXQ_DEPTH ||
             !BNA_POWER_OF_2(ringparam->tx_pending)) {
                 mutex_unlock(&bnad->conf_mutex);
                 return -EINVAL;