qlcnic: Fix bug in Tx completion path

o Driver is using common tx_clean_lock for all Tx queues. This patch
  adds per queue tx_clean_lock.
o Driver is not updating sw_consumer while processing Tx completion
  when interface is going down. Fixed in this patch.

Signed-off-by: Shahed Shaikh <shahed.shaikh@qlogic.com>
Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 12 insertions, 7 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
index 4dfef81e3c45..ff80cd8f6d2b 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
@@ -579,6 +579,8 @@ struct qlcnic_host_tx_ring {
         dma_addr_t phys_addr;
         dma_addr_t hw_cons_phys_addr;
         struct netdev_queue *txq;
+        /* Lock to protect Tx descriptors cleanup */
+        spinlock_t tx_clean_lock;
 } ____cacheline_internodealigned_in_smp;
 
 /*
@@ -1095,7 +1097,6 @@ struct qlcnic_adapter {
         struct qlcnic_filter_hash rx_fhash;
         struct list_head vf_mc_list;
 
-        spinlock_t tx_clean_lock;
         spinlock_t mac_learn_lock;
         /* spinlock for catching rcv filters for eswitch traffic */
         spinlock_t rx_mac_learn_lock;
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_init.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_init.c
index e9c21e5d0ca9..c4262c23ed7c 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_init.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_init.c
@@ -134,6 +134,8 @@ void qlcnic_release_tx_buffers(struct qlcnic_adapter *adapter,
         struct qlcnic_skb_frag *buffrag;
         int i, j;
 
+        spin_lock(&tx_ring->tx_clean_lock);
+
         cmd_buf = tx_ring->cmd_buf_arr;
         for (i = 0; i < tx_ring->num_desc; i++) {
                 buffrag = cmd_buf->frag_array;
@@ -157,6 +159,8 @@ void qlcnic_release_tx_buffers(struct qlcnic_adapter *adapter,
                 }
                 cmd_buf++;
         }
+
+        spin_unlock(&tx_ring->tx_clean_lock);
 }
 
 void qlcnic_free_sw_resources(struct qlcnic_adapter *adapter)
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
index 136297631999..ad1531ae3aa8 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
@@ -782,7 +782,7 @@ static int qlcnic_process_cmd_ring(struct qlcnic_adapter *adapter,
         struct net_device *netdev = adapter->netdev;
         struct qlcnic_skb_frag *frag;
 
-        if (!spin_trylock(&adapter->tx_clean_lock))
+        if (!spin_trylock(&tx_ring->tx_clean_lock))
                 return 1;
 
         sw_consumer = tx_ring->sw_consumer;
@@ -811,8 +811,9 @@ static int qlcnic_process_cmd_ring(struct qlcnic_adapter *adapter,
                         break;
         }
 
+        tx_ring->sw_consumer = sw_consumer;
+
         if (count && netif_running(netdev)) {
-                tx_ring->sw_consumer = sw_consumer;
                 smp_mb();
                 if (netif_tx_queue_stopped(tx_ring->txq) &&
                     netif_carrier_ok(netdev)) {
@@ -838,7 +839,8 @@ static int qlcnic_process_cmd_ring(struct qlcnic_adapter *adapter,
          */
         hw_consumer = le32_to_cpu(*(tx_ring->hw_consumer));
         done = (sw_consumer == hw_consumer);
-        spin_unlock(&adapter->tx_clean_lock);
+
+        spin_unlock(&tx_ring->tx_clean_lock);
 
         return done;
 }
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index 2c8cac0c6a55..b8a245a79de3 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -1756,7 +1756,6 @@ void __qlcnic_down(struct qlcnic_adapter *adapter, struct net_device *netdev)
         if (qlcnic_sriov_vf_check(adapter))
                 qlcnic_sriov_cleanup_async_list(&adapter->ahw->sriov->bc);
         smp_mb();
-        spin_lock(&adapter->tx_clean_lock);
         netif_carrier_off(netdev);
         adapter->ahw->linkup = 0;
         netif_tx_disable(netdev);
@@ -1777,7 +1776,6 @@ void __qlcnic_down(struct qlcnic_adapter *adapter, struct net_device *netdev)
 
         for (ring = 0; ring < adapter->drv_tx_rings; ring++)
                 qlcnic_release_tx_buffers(adapter, &adapter->tx_ring[ring]);
-        spin_unlock(&adapter->tx_clean_lock);
 }
 
 /* Usage: During suspend and firmware recovery module */
@@ -2172,6 +2170,7 @@ int qlcnic_alloc_tx_rings(struct qlcnic_adapter *adapter,
                 }
                 memset(cmd_buf_arr, 0, TX_BUFF_RINGSIZE(tx_ring));
                 tx_ring->cmd_buf_arr = cmd_buf_arr;
+                spin_lock_init(&tx_ring->tx_clean_lock);
         }
 
         if (qlcnic_83xx_check(adapter) ||
@@ -2299,7 +2298,6 @@ qlcnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
         rwlock_init(&adapter->ahw->crb_lock);
         mutex_init(&adapter->ahw->mem_lock);
 
-        spin_lock_init(&adapter->tx_clean_lock);
         INIT_LIST_HEAD(&adapter->mac_list);
 
         qlcnic_register_dcb(adapter);