On 07/09/2015 08:01 PM, Rafał Miłecki wrote:
Hello again.
After fixing user space <-> brcmfmac communication for using valid MACs:
[PATCH] brcmfmac: set wiphy's addresses to provide valid MACs
i started testing multiple interfaces.
It seems there are many bugs in brcmfmac :(
Well, you are using the device outside its capability, because brcmfmac
does not properly announce interface combinations. I will submit patches
for that.
So after running 3 AP interfaces and switching my STA device between them I
started seeing WARNINGs triggered by brcmf_netdev_wait_pend8021x. It was
brcmf_cfg80211_del_key that was calling above function.
The problem is that brcmf_netdev_start_xmit increases interfaces's
pend_8021x_cnt on every transmission of ETH_P_PAE but brcmf_txfinalize fails
(from time to time?) do decrease it.
There is a bug in brcmf_txfinalize that stops it from finding an interface for
the received TX transmission success. I added some debugging to brcmfmac as you
can see below and this is what I got:
[ 39.394022] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c72c1dc0 on ifidx:0
[ 39.413251] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c72c1dc0 on ifidx:2
[ 39.421887] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c725a7c0 on ifidx:1
[ 39.431720] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c6a78a00 on ifidx:0
[ 39.442829] brcmfmac: [brcmf_txfinalize] Finalized ETH_P_PAE skb:c725a7c0 but got invalid ifidx:1
[ 39.451773] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c726ee80 on ifidx:2
[ 39.460384] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c725a7c0 on ifidx:1
[ 39.536224] brcmfmac: [brcmf_txfinalize] Finalized ETH_P_PAE skb:c725a7c0 but got invalid ifidx:1
[ 51.884737] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c714cd00 on ifidx:1
[ 51.895577] brcmfmac: [brcmf_txfinalize] Finalized ETH_P_PAE skb:c714cd00 but got invalid ifidx:1
[ 51.904592] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c707de80 on ifidx:2
[ 51.913195] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c7011e80 on ifidx:0
[ 51.922900] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c725a280 on ifidx:1
[ 51.933988] brcmfmac: [brcmf_txfinalize] Finalized ETH_P_PAE skb:c725a280 but got invalid ifidx:1
[ 51.942979] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c714cd00 on ifidx:2
[ 51.951602] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c707de80 on ifidx:0
[ 55.228402] brcmfmac: [brcmf_netdev_wait_pend8021x] WARNING pend_8021x_cnt:4
[ 55.278395] brcmfmac: [brcmf_netdev_wait_pend8021x] WARNING pend_8021x_cnt:4
[ 55.328394] brcmfmac: [brcmf_netdev_wait_pend8021x] WARNING pend_8021x_cnt:4
[ 55.336211] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c7070b80 on ifidx:2
[ 55.347075] brcmfmac: [brcmf_txfinalize] Finalized ETH_P_PAE skb:c7070b80 and decreased pend_8021x_cnt for ifidx:2 but got negative count -1!
[ 55.387991] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c6a78a00 on ifidx:1
[ 55.396601] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c7070b80 on ifidx:0
[ 55.406245] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c707d400 on ifidx:2
[ 55.417257] brcmfmac: [brcmf_txfinalize] Finalized ETH_P_PAE skb:c6a78a00 but got invalid ifidx:1
[ 55.426144] brcmfmac: [brcmf_txfinalize] Finalized ETH_P_PAE skb:c707d400 and decreased pend_8021x_cnt for ifidx:2 but got negative count -1!
[ 55.439019] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c714cd00 on ifidx:1
[ 55.447611] brcmfmac: [brcmf_netdev_start_xmit] Transmitting ETH_P_PAE skb:c72c2580 on ifidx:0
[ 55.498397] brcmfmac: [brcmf_netdev_wait_pend8021x] WARNING pend_8021x_cnt:6
[ 55.504785] brcmfmac: [brcmf_txfinalize] Finalized ETH_P_PAE skb:c714cd00 but got invalid ifidx:1
As you can see brcmf_txfinalize fails to find interface for ifidx:1. Why is
that? It seems that drvr->iflist is an array indexed by bssidx, but
brcmf_txfinalize uses ifidx to access it. Obviously ifidx != bssidx.
This also results in decreasing pend_8021x_cnt for wrong interfaces and some
negative values.
Will you fix this?
I have some patches reworking the driver using drvr->iflist. One of the
fixes involves calling brcmf_txfinalize with brcmf_if instance. I need
to do more testing on those patches before submitting them. If you are
willing to give them a try as well I can provide them.
Regards,
Arend
---
drivers/net/wireless/brcm80211/brcmfmac/core.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/core.c b/drivers/net/wireless/brcm80211/brcmfmac/core.c
index 5663870..e521ce5 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/core.c
@@ -238,8 +238,10 @@ static netdev_tx_t brcmf_netdev_start_xmit(struct sk_buff *skb,
goto done;
}
- if (eh->h_proto == htons(ETH_P_PAE))
+ if (eh->h_proto == htons(ETH_P_PAE)) {
+ pr_info("[%s] Transmitting ETH_P_PAE skb:%p on ifidx:%d\n", __FUNCTION__, skb, ifp->ifidx);
atomic_inc(&ifp->pend_8021x_cnt);
+ }
ret = brcmf_fws_process_skb(ifp, skb);
@@ -543,6 +545,8 @@ void brcmf_rx_frame(struct device *dev, struct sk_buff *skb)
brcmf_netif_rx(ifp, skb);
}
+static int brcmf_get_pend_8021x_cnt(struct brcmf_if *ifp);
+
void brcmf_txfinalize(struct brcmf_pub *drvr, struct sk_buff *txp, u8 ifidx,
bool success)
{
@@ -551,14 +555,24 @@ void brcmf_txfinalize(struct brcmf_pub *drvr, struct sk_buff *txp, u8 ifidx,
u16 type;
ifp = drvr->iflist[ifidx];
- if (!ifp)
+ if (!ifp) {
+ eh = (struct ethhdr *)(txp->data);
+ type = ntohs(eh->h_proto);
+
+ if (type == ETH_P_PAE) {
+ pr_warn("[%s] Finalized ETH_P_PAE skb:%p but got invalid ifidx:%d\n", __FUNCTION__, txp, ifidx);
+ }
+
goto done;
+ }
eh = (struct ethhdr *)(txp->data);
type = ntohs(eh->h_proto);
if (type == ETH_P_PAE) {
atomic_dec(&ifp->pend_8021x_cnt);
+ if (brcmf_get_pend_8021x_cnt(ifp) < 0)
+ pr_warn("[%s] Finalized ETH_P_PAE skb:%p and decreased pend_8021x_cnt for ifidx:%d but got negative count %d!\n", __FUNCTION__, txp, ifidx, brcmf_get_pend_8021x_cnt(ifp));
if (waitqueue_active(&ifp->pend_8021x_wait))
wake_up(&ifp->pend_8021x_wait);
}
@@ -1140,8 +1154,8 @@ int brcmf_netdev_wait_pend8021x(struct brcmf_if *ifp)
err = wait_event_timeout(ifp->pend_8021x_wait,
!brcmf_get_pend_8021x_cnt(ifp),
msecs_to_jiffies(MAX_WAIT_FOR_8021X_TX));
-
- WARN_ON(!err);
+ if (!err)
+ pr_err("[%s] WARNING pend_8021x_cnt:%d\n", __FUNCTION__, brcmf_get_pend_8021x_cnt(ifp));
return !err;
}
--
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