svn commit: r207337 - head/sys/dev/e1000

[Jack F Vogel]

Author: jfv
Date: Wed Apr 28 19:22:52 2010
New Revision: 207337
URL: http://svn.freebsd.org/changeset/base/207337

Log:
  Address the LOD that some are seeing, put the RX lock
  back in rxeof (I could see little point in taking it out),
  and now release it before the stack entry.
  
  Also, make it so the 82574 does not configure for multiqueue
  when its not used in the stack.

Modified:
  head/sys/dev/e1000/if_em.c

Modified: head/sys/dev/e1000/if_em.c
==============================================================================
--- head/sys/dev/e1000/if_em.c	Wed Apr 28 18:55:46 2010	(r207336)
+++ head/sys/dev/e1000/if_em.c	Wed Apr 28 19:22:52 2010	(r207337)
@@ -347,8 +347,13 @@ static int em_debug_sbp = FALSE;
 TUNABLE_INT("hw.em.sbp", &em_debug_sbp);
 
 /* Local controls for MSI/MSIX */
+#ifdef EM_MULTIQUEUE
 static int em_enable_msix = TRUE;
 static int em_msix_queues = 2; /* for 82574, can be 1 or 2 */
+#else
+static int em_enable_msix = FALSE;
+static int em_msix_queues = 0; /* disable */
+#endif
 TUNABLE_INT("hw.em.enable_msix", &em_enable_msix);
 TUNABLE_INT("hw.em.msix_queues", &em_msix_queues);
 
@@ -1371,9 +1376,7 @@ em_poll(struct ifnet *ifp, enum poll_cmd
 	}
 	EM_CORE_UNLOCK(adapter);
 
-	EM_RX_LOCK(rxr);
 	rx_done = em_rxeof(rxr, count);
-	EM_RX_UNLOCK(rxr);
 
 	EM_TX_LOCK(txr);
 	em_txeof(txr);
@@ -1449,9 +1452,7 @@ em_handle_que(void *context, int pending
 
 
 	if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
-		EM_RX_LOCK(rxr);
 		more_rx = em_rxeof(rxr, adapter->rx_process_limit);
-		EM_RX_UNLOCK(rxr);
 
 		EM_TX_LOCK(txr);
 		em_txeof(txr);
@@ -1511,10 +1512,8 @@ em_msix_rx(void *arg)
 	struct adapter	*adapter = rxr->adapter;
 	bool		more;
 
-	EM_RX_LOCK(rxr);
 	++rxr->rx_irq;
 	more = em_rxeof(rxr, adapter->rx_process_limit);
-	EM_RX_UNLOCK(rxr);
 	if (more)
 		taskqueue_enqueue(rxr->tq, &rxr->rx_task);
 	else
@@ -1553,9 +1552,7 @@ em_handle_rx(void *context, int pending)
 	struct adapter	*adapter = rxr->adapter;
         bool            more;
 
-	EM_RX_LOCK(rxr);
 	more = em_rxeof(rxr, adapter->rx_process_limit);
-	EM_RX_UNLOCK(rxr);
 	if (more)
 		taskqueue_enqueue(rxr->tq, &rxr->rx_task);
 	else
@@ -4100,7 +4097,7 @@ em_rxeof(struct rx_ring *rxr, int count)
 	bool			eop;
 	struct e1000_rx_desc	*cur;
 
-	EM_RX_LOCK_ASSERT(rxr);
+	EM_RX_LOCK(rxr);
 
 	for (i = rxr->next_to_check, processed = 0; count != 0;) {
 
@@ -4194,8 +4191,13 @@ skip:
 			i = 0;
 
 		/* Send to the stack */
-		if (sendmp != NULL)
+		if (sendmp != NULL) {
+			rxr->next_to_check = i;
+			EM_RX_UNLOCK(rxr);
 			(*ifp->if_input)(ifp, sendmp);
+			EM_RX_LOCK(rxr);
+			i = rxr->next_to_check;
+		}
 
 		/* Only refresh mbufs every 8 descriptors */
 		if (processed == 8) {
@@ -4211,6 +4213,7 @@ skip:
 	}
 
 	rxr->next_to_check = i;
+	EM_RX_UNLOCK(rxr);
 
 #ifdef DEVICE_POLLING
 	return (rxdone);