vxge: fix pktgen hangs (don't abuse skb->cb[])

This patch fixes a case in the transmit completion code which was resulting
in pktgen hanging at the end of a run.  The cause is due to the fact that
the ->cb[] area of an skb cannot be used in a network driver's transmit
path, as that area belongs to the network protocol.  Pktgen hangs, as it
sends out the same packet multiple times, and vxge's use of this area of
the skb for a temporary list can only add the packet to the temporary list
once (while it may be on the queue many times).  The fix is to remove this
abuse of skb->cb[].  Instead, skb pointers are placed into a temporary
stack array, and then free outside of the tx lock.  This retains the smp
optimization of doing dev_kfree_skb() outside of the tx lock.

Signed-off-by: Benjamin LaHaise <ben.lahaise@neterion.com>
Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/net/vxge/vxge-traffic.c b/drivers/net/vxge/vxge-traffic.c
index 370f55cbbad7..c249cd25a5d0 100644
--- a/drivers/net/vxge/vxge-traffic.c
+++ b/drivers/net/vxge/vxge-traffic.c
@@ -2508,7 +2508,8 @@ enum vxge_hw_status vxge_hw_vpath_poll_rx(struct __vxge_hw_ring *ring)
  * See also: vxge_hw_vpath_poll_tx().
  */
 enum vxge_hw_status vxge_hw_vpath_poll_tx(struct __vxge_hw_fifo *fifo,
-                                        void **skb_ptr)
+                                        struct sk_buff ***skb_ptr, int nr_skb,
+                                        int *more)
 {
         enum vxge_hw_fifo_tcode t_code;
         void *first_txdlh;
@@ -2520,8 +2521,8 @@ enum vxge_hw_status vxge_hw_vpath_poll_tx(struct __vxge_hw_fifo *fifo,
         status = vxge_hw_fifo_txdl_next_completed(fifo,
                                 &first_txdlh, &t_code);
         if (status == VXGE_HW_OK)
-                if (fifo->callback(fifo, first_txdlh,
-                        t_code, channel->userdata, skb_ptr) != VXGE_HW_OK)
+                if (fifo->callback(fifo, first_txdlh, t_code,
+                        channel->userdata, skb_ptr, nr_skb, more) != VXGE_HW_OK)
                         status = VXGE_HW_COMPLETIONS_REMAIN;
 
         return status;