pch_gbe: don't re-set RX_FIFO_ERR flag in napi_poll

If we were in RX_FIFO_ERR state and entered pch_gbe_napi_poll(), we'll
anyway clean some rx space and thus can continue to receive more packets.
Currently, we re-set the RX_FIFO_ERR in situations when we've exhausted our
budget for RX cleaning or cleaned some TX packets. Removing it gives us
+20%-40% speed increase and a lot less of RX_FIFO_ERRors reported.

Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 13 deletions

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index d5190bf94ba0..4ffad780c7ac 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -2419,7 +2419,6 @@ static int pch_gbe_napi_poll(struct napi_struct *napi, int budget)
         int work_done = 0;
         bool poll_end_flag = false;
         bool cleaned = false;
-        u32 int_en;
 
         pr_debug("budget : %d\n", budget);
 
@@ -2436,19 +2435,13 @@ static int pch_gbe_napi_poll(struct napi_struct *napi, int budget)
 
         if (poll_end_flag) {
                 napi_complete(napi);
-                if (adapter->rx_stop_flag) {
-                        adapter->rx_stop_flag = false;
-                        pch_gbe_start_receive(&adapter->hw);
-                }
                 pch_gbe_irq_enable(adapter);
-        } else
-                if (adapter->rx_stop_flag) {
-                        adapter->rx_stop_flag = false;
-                        pch_gbe_start_receive(&adapter->hw);
-                        int_en = ioread32(&adapter->hw.reg->INT_EN);
-                        iowrite32((int_en | PCH_GBE_INT_RX_FIFO_ERR),
-                                &adapter->hw.reg->INT_EN);
-                }
+        }
+
+        if (adapter->rx_stop_flag) {
+                adapter->rx_stop_flag = false;
+                pch_gbe_start_receive(&adapter->hw);
+        }
 
         pr_debug("poll_end_flag : %d  work_done : %d  budget : %d\n",
                  poll_end_flag, work_done, budget);