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authorFlorian Fainelli <f.fainelli@gmail.com>2017-01-03 16:34:49 -0800
committerDavid S. Miller <davem@davemloft.net>2017-01-04 13:33:29 -0500
commit38e5a85562a6cd911fc26d951d576551a688574c (patch)
treea7413917257142a43be1d3c58cdef4e7e2112bdd /drivers
parentbb7da333d0a9f3bddc08f84187b7579a3f68fd24 (diff)
downloadlinux-38e5a85562a6cd911fc26d951d576551a688574c.tar.bz2
net: systemport: Pad packet before inserting TSB
Inserting the TSB means adding an extra 8 bytes in front the of packet that is going to be used as metadata information by the TDMA engine, but stripped off, so it does not really help with the packet padding. For some odd packet sizes that fall below the 60 bytes payload (e.g: ARP) we can end-up padding them after the TSB insertion, thus making them 64 bytes, but with the TDMA stripping off the first 8 bytes, they could still be smaller than 64 bytes which is required to ingress the switch. Fix this by swapping the padding and TSB insertion, guaranteeing that the packets have the right sizes. Fixes: 80105befdb4b ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/broadcom/bcmsysport.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index e67908b5edfe..7e8cf213fd81 100644
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -1012,15 +1012,6 @@ static netdev_tx_t bcm_sysport_xmit(struct sk_buff *skb,
goto out;
}
- /* Insert TSB and checksum infos */
- if (priv->tsb_en) {
- skb = bcm_sysport_insert_tsb(skb, dev);
- if (!skb) {
- ret = NETDEV_TX_OK;
- goto out;
- }
- }
-
/* The Ethernet switch we are interfaced with needs packets to be at
* least 64 bytes (including FCS) otherwise they will be discarded when
* they enter the switch port logic. When Broadcom tags are enabled, we
@@ -1033,6 +1024,15 @@ static netdev_tx_t bcm_sysport_xmit(struct sk_buff *skb,
goto out;
}
+ /* Insert TSB and checksum infos */
+ if (priv->tsb_en) {
+ skb = bcm_sysport_insert_tsb(skb, dev);
+ if (!skb) {
+ ret = NETDEV_TX_OK;
+ goto out;
+ }
+ }
+
skb_len = skb->len;
mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);