brcm63xx: fix ethernet breakage in 3.18

Linux commit d75b1ade567ffab ("net: less interrupt masking in NAPI")
chose the samantics of the napi poll return value, which caused napi to
not resume interrups/polling anymore.

Fix the return value to restore expected behaviour.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44576 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/brcm63xx/patches-3.14/426-bcm63xx_enet-fix-napi-poll-return-value.patch b/target/linux/brcm63xx/patches-3.14/426-bcm63xx_enet-fix-napi-poll-return-value.patch
new file mode 100644 (file)
index 0000000..af34c23
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.14/426-bcm63xx_enet-fix-napi-poll-return-value.patch
@@ -0,0 +1,27 @@
+From d150ac8f353cb1ab59288829db006300120c9daf Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Sat, 28 Feb 2015 20:23:13 +0100
+Subject: [PATCH] bcm63xx_enet: fix napi poll return value
+
+Commit d75b1ade567ffab ("net: less interrupt masking in NAPI") changed
+the way how napi treated a returnvalue < budget, which causes hangs when
+there there was tx_work_done, but rx_work_done is less than budget.
+
+To fix this, return budget instead of rx_done to ensure repolling.
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ drivers/net/ethernet/broadcom/bcm63xx_enet.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
++++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+@@ -508,7 +508,7 @@ static int bcm_enet_poll(struct napi_str
+ 
+       if (rx_work_done >= budget || tx_work_done > 0) {
+               /* rx/tx queue is not yet empty/clean */
+-              return rx_work_done;
++              return budget;
+       }
+ 
+       /* no more packet in rx/tx queue, remove device from poll

diff --git a/target/linux/brcm63xx/patches-3.18/426-bcm63xx_enet-fix-napi-poll-return-value.patch b/target/linux/brcm63xx/patches-3.18/426-bcm63xx_enet-fix-napi-poll-return-value.patch
new file mode 100644 (file)
index 0000000..af34c23
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.18/426-bcm63xx_enet-fix-napi-poll-return-value.patch
@@ -0,0 +1,27 @@
+From d150ac8f353cb1ab59288829db006300120c9daf Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Sat, 28 Feb 2015 20:23:13 +0100
+Subject: [PATCH] bcm63xx_enet: fix napi poll return value
+
+Commit d75b1ade567ffab ("net: less interrupt masking in NAPI") changed
+the way how napi treated a returnvalue < budget, which causes hangs when
+there there was tx_work_done, but rx_work_done is less than budget.
+
+To fix this, return budget instead of rx_done to ensure repolling.
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ drivers/net/ethernet/broadcom/bcm63xx_enet.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
++++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+@@ -508,7 +508,7 @@ static int bcm_enet_poll(struct napi_str
+ 
+       if (rx_work_done >= budget || tx_work_done > 0) {
+               /* rx/tx queue is not yet empty/clean */
+-              return rx_work_done;
++              return budget;
+       }
+ 
+       /* no more packet in rx/tx queue, remove device from poll