ucc_geth: NAPI-related bug fixes

Based partly on the gianfar driver, this patch fixes several
bugs which were causing NAPI to be completely unusable.
* An IRQ is still needed in NAPI, to kick off NAPI task,
  and for Tx processing.  Request the IRQ.
* If rx_work_limit = 0 we are not complete.
* While running Rx NAPI processing we must mask Rx events,
  including Rx busy.
* ucc_geth_rx function does not need a lock.
  Could lead to deadlock in NAPI case.
* There's no need to loop reading ucce multiple times in the ISR,
  so while adding the call to schedule NAPI which was not there,
  simplify the event processing into if-else format.
* Rx Busy now kicks off NAPI processing, while still
  being counted as an error.

Signed-off-by: Michael Reiss <michael.f.reiss@freescale.com>
Signed-off-by: Michael Barkowski <michael.barkowski@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/ucc_geth.h b/drivers/net/ucc_geth.h
index 6e97c20b92aa..7cf3dbc9fd4c 100644
--- a/drivers/net/ucc_geth.h
+++ b/drivers/net/ucc_geth.h
@@ -205,6 +205,9 @@ struct ucc_geth {
 #define UCCE_OTHER       (UCCE_SCAR | UCCE_GRA  | UCCE_CBPR | UCCE_BSY  |\
                         UCCE_RXC  | UCCE_TXC  | UCCE_TXE)
 
+#define UCCE_RX_EVENTS                                                  (UCCE_RXF | UCCE_BSY)
+#define UCCE_TX_EVENTS                                                  (UCCE_TXB | UCCE_TXE)
+
 /* UCC GETH UPSMR (Protocol Specific Mode Register) */
 #define UPSMR_ECM                               0x04000000      /* Enable CAM
                                                                    Miss or