net: Use queue aware tests throughout.

This effectively "flips the switch" by making the core networking
and multiqueue-aware drivers use the new TX multiqueue structures.

Non-multiqueue drivers need no changes.  The interfaces they use such
as netif_stop_queue() degenerate into an operation on TX queue zero.
So everything "just works" for them.

Code that really wants to do "X" to all TX queues now invokes a
routine that does so, such as netif_tx_wake_all_queues(),
netif_tx_stop_all_queues(), etc.

pktgen and netpoll required a little bit more surgery than the others.

In particular the pktgen changes, whilst functional, could be largely
improved.  The initial check in pktgen_xmit() will sometimes check the
wrong queue, which is mostly harmless.  The thing to do is probably to
invoke fill_packet() earlier.

The bulk of the netpoll changes is to make the code operate solely on
the TX queue indicated by by the SKB queue mapping.

Setting of the SKB queue mapping is entirely confined inside of
net/core/dev.c:dev_pick_tx().  If we end up needing any kind of
special semantics (drops, for example) it will be implemented here.

Finally, we now have a "real_num_tx_queues" which is where the driver
indicates how many TX queues are actually active.

With IGB changes from Jeff Kirsher.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 29 deletions

diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 5f0fcb04afff..9dae40ccf048 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -545,63 +545,53 @@ static struct pci_driver s2io_driver = {
 /* netqueue manipulation helper functions */
 static inline void s2io_stop_all_tx_queue(struct s2io_nic *sp)
 {
-        int i;
-        if (sp->config.multiq) {
-                for (i = 0; i < sp->config.tx_fifo_num; i++)
-                        netif_stop_subqueue(sp->dev, i);
-        } else {
+        if (!sp->config.multiq) {
+                int i;
+
                 for (i = 0; i < sp->config.tx_fifo_num; i++)
                         sp->mac_control.fifos[i].queue_state = FIFO_QUEUE_STOP;
-                netif_stop_queue(sp->dev);
         }
+        netif_tx_stop_all_queues(sp->dev);
 }
 
 static inline void s2io_stop_tx_queue(struct s2io_nic *sp, int fifo_no)
 {
-        if (sp->config.multiq)
-                netif_stop_subqueue(sp->dev, fifo_no);
-        else {
+        if (!sp->config.multiq)
                 sp->mac_control.fifos[fifo_no].queue_state =
                         FIFO_QUEUE_STOP;
-                netif_stop_queue(sp->dev);
-        }
+
+        netif_tx_stop_all_queues(sp->dev);
 }
 
 static inline void s2io_start_all_tx_queue(struct s2io_nic *sp)
 {
-        int i;
-        if (sp->config.multiq) {
-                for (i = 0; i < sp->config.tx_fifo_num; i++)
-                        netif_start_subqueue(sp->dev, i);
-        } else {
+        if (!sp->config.multiq) {
+                int i;
+
                 for (i = 0; i < sp->config.tx_fifo_num; i++)
                         sp->mac_control.fifos[i].queue_state = FIFO_QUEUE_START;
-                netif_start_queue(sp->dev);
         }
+        netif_tx_start_all_queues(sp->dev);
 }
 
 static inline void s2io_start_tx_queue(struct s2io_nic *sp, int fifo_no)
 {
-        if (sp->config.multiq)
-                netif_start_subqueue(sp->dev, fifo_no);
-        else {
+        if (!sp->config.multiq)
                 sp->mac_control.fifos[fifo_no].queue_state =
                         FIFO_QUEUE_START;
-                netif_start_queue(sp->dev);
-        }
+
+        netif_tx_start_all_queues(sp->dev);
 }
 
 static inline void s2io_wake_all_tx_queue(struct s2io_nic *sp)
 {
-        int i;
-        if (sp->config.multiq) {
-                for (i = 0; i < sp->config.tx_fifo_num; i++)
-                        netif_wake_subqueue(sp->dev, i);
-        } else {
+        if (!sp->config.multiq) {
+                int i;
+
                 for (i = 0; i < sp->config.tx_fifo_num; i++)
                         sp->mac_control.fifos[i].queue_state = FIFO_QUEUE_START;
-                netif_wake_queue(sp->dev);
         }
+        netif_tx_wake_all_queues(sp->dev);
 }
 
 static inline void s2io_wake_tx_queue(
@@ -8691,5 +8681,5 @@ static void s2io_io_resume(struct pci_dev *pdev)
         }
 
         netif_device_attach(netdev);
-        netif_wake_queue(netdev);
+        netif_tx_wake_all_queues(netdev);
 }