net: ethernet: sun: niu set correct packet size in skb

[ Upstream commit 14224923c3600bae2ac4dcae3bf0c3d4dc2812be ]

Currently, skb->len and skb->data_len are set to the page size, not
the packet size. This causes the frame check sequence to not be
located at the "end" of the packet resulting in ethernet frame check
errors. The driver does work currently, but stricter kernel facing
networking solutions like OpenVSwitch will drop these packets as
invalid.

These changes set the packet size correctly so that these errors no
longer occur. The length does not include the frame check sequence, so
that subtraction was removed.

Tested on Oracle/SUN Multithreaded 10-Gigabit Ethernet Network
Controller [108e:abcd] and validated in wireshark.

Signed-off-by: Rob Taglang <rob@taglang.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index 8dd545fed30d2aa62f2dd6940ac44f8b33a951f3..6c94af263be8b246dd74e298eb0e16fd9db3c914 100644 (file)
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -3443,7 +3443,7 @@ static int niu_process_rx_pkt(struct napi_struct *napi, struct niu *np,
 
                len = (val & RCR_ENTRY_L2_LEN) >>
                        RCR_ENTRY_L2_LEN_SHIFT;
-               len -= ETH_FCS_LEN;
+               append_size = len + ETH_HLEN + ETH_FCS_LEN;
 
                addr = (val & RCR_ENTRY_PKT_BUF_ADDR) <<
                        RCR_ENTRY_PKT_BUF_ADDR_SHIFT;
@@ -3453,7 +3453,6 @@ static int niu_process_rx_pkt(struct napi_struct *napi, struct niu *np,
                                         RCR_ENTRY_PKTBUFSZ_SHIFT];
 
                off = addr & ~PAGE_MASK;
-               append_size = rcr_size;
                if (num_rcr == 1) {
                        int ptype;
 
@@ -3466,7 +3465,7 @@ static int niu_process_rx_pkt(struct napi_struct *napi, struct niu *np,
                        else
                                skb_checksum_none_assert(skb);
                } else if (!(val & RCR_ENTRY_MULTI))
-                       append_size = len - skb->len;
+                       append_size = append_size - skb->len;
 
                niu_rx_skb_append(skb, page, off, append_size, rcr_size);
                if ((page->index + rp->rbr_block_size) - rcr_size == addr) {