* Ingo Molnar <[email protected]> wrote:
> > but this one should be inactive (not plugged into the network).
> > Should i try to get a debug print out of the actual 'weight' and
> > 'work' integers, and of the n->poll function address?
>
> ok, i've added such a patch.
>
> looking at the dev.c code - can napi_struct->weight be zero
> legitimately? If yes then the 0 gets passed to the driver and the
> driver would return 1 - violating the assertion.
update:
[ 186.635916] WARNING: at net/core/dev.c:2166 net_rx_action()
[ 186.641351] [<c060d9f5>] net_rx_action+0x145/0x1b0
[ 186.646191] [<c011d752>] __do_softirq+0x42/0x90
[ 186.650784] [<c011d7c6>] do_softirq+0x26/0x30
[ 186.655202] [<c011db48>] local_bh_enable+0x48/0xa0
[ 186.660055] [<c06023e0>] lock_sock_nested+0xa0/0xc0
[ 186.664995] [<c065da16>] tcp_recvmsg+0x16/0xbc0
[ 186.669588] [<c013e94b>] __generic_file_aio_write_nolock+0x27b/0x520
[ 186.676001] [<c0601d75>] sock_common_recvmsg+0x45/0x70
[ 186.681202] [<c05ff5df>] sock_aio_read+0x11f/0x140
[ 186.686054] [<c015c086>] do_sync_read+0xc6/0x110
[ 186.690735] [<c012b9b0>] autoremove_wake_function+0x0/0x40
[ 186.696280] [<c060dcfc>] net_tx_action+0x3c/0xe0
[ 186.700961] [<c015c9c2>] vfs_read+0x132/0x140
[ 186.705378] [<c015cd41>] sys_read+0x41/0x70
[ 186.709625] [<c0102b66>] sysenter_past_esp+0x5f/0x89
[ 186.714651] =======================
[ 186.718210] work: 65, weight: 64
[ 186.721414] ->poll: (nv_napi_poll+0x0/0x760)
so nv_napi_poll() returned with 65. How is that possible? Ah ...:
(rx_processed_cnt++ < limit)) {
that should be:
(++rx_processed_cnt < limit)) {
right? Find the fix below.
Ingo
-------------------->
Subject: forcedeth: fix the NAPI poll function
From: Ingo Molnar <[email protected]>
fix the forcedeth NAPI poll function to not emit this warning:
[ 186.635916] WARNING: at net/core/dev.c:2166 net_rx_action()
[ 186.641351] [<c060d9f5>] net_rx_action+0x145/0x1b0
[ 186.646191] [<c011d752>] __do_softirq+0x42/0x90
[ 186.650784] [<c011d7c6>] do_softirq+0x26/0x30
[ 186.655202] [<c011db48>] local_bh_enable+0x48/0xa0
[ 186.660055] [<c06023e0>] lock_sock_nested+0xa0/0xc0
[ 186.664995] [<c065da16>] tcp_recvmsg+0x16/0xbc0
[ 186.669588] [<c013e94b>] __generic_file_aio_write_nolock+0x27b/0x520
[ 186.676001] [<c0601d75>] sock_common_recvmsg+0x45/0x70
[ 186.681202] [<c05ff5df>] sock_aio_read+0x11f/0x140
[ 186.686054] [<c015c086>] do_sync_read+0xc6/0x110
[ 186.690735] [<c012b9b0>] autoremove_wake_function+0x0/0x40
[ 186.696280] [<c060dcfc>] net_tx_action+0x3c/0xe0
[ 186.700961] [<c015c9c2>] vfs_read+0x132/0x140
[ 186.705378] [<c015cd41>] sys_read+0x41/0x70
[ 186.709625] [<c0102b66>] sysenter_past_esp+0x5f/0x89
[ 186.714651] =======================
Signed-off-by: Ingo Molnar <[email protected]>
---
drivers/net/forcedeth.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
Index: linux/drivers/net/forcedeth.c
===================================================================
--- linux.orig/drivers/net/forcedeth.c
+++ linux/drivers/net/forcedeth.c
@@ -2274,7 +2274,7 @@ static int nv_rx_process(struct net_devi
while((np->get_rx.orig != np->put_rx.orig) &&
!((flags = le32_to_cpu(np->get_rx.orig->flaglen)) & NV_RX_AVAIL) &&
- (rx_processed_cnt++ < limit)) {
+ (++rx_processed_cnt < limit)) {
dprintk(KERN_DEBUG "%s: nv_rx_process: flags 0x%x.\n",
dev->name, flags);
@@ -2412,7 +2412,7 @@ static int nv_rx_process_optimized(struc
while((np->get_rx.ex != np->put_rx.ex) &&
!((flags = le32_to_cpu(np->get_rx.ex->flaglen)) & NV_RX2_AVAIL) &&
- (rx_processed_cnt++ < limit)) {
+ (++rx_processed_cnt < limit)) {
dprintk(KERN_DEBUG "%s: nv_rx_process_optimized: flags 0x%x.\n",
dev->name, flags);
-
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