8139cp: Fix TSO/scatter-gather descriptor setup

When sending a TSO frame in multiple buffers, we were neglecting to set
the first descriptor up in TSO mode.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index cbca0de..75a8cee 100644 (file)
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -790,7 +790,7 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
                          entry, skb->len);
        } else {
                struct cp_desc *txd;
-               u32 first_len, first_eor;
+               u32 first_len, first_eor, ctrl;
                dma_addr_t first_mapping;
                int frag, first_entry = entry;
                const struct iphdr *ip = ip_hdr(skb);
@@ -810,7 +810,6 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
                for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
                        const skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag];
                        u32 len;
-                       u32 ctrl;
                        dma_addr_t mapping;
 
                        entry = NEXT_TX(entry);
@@ -858,20 +857,19 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
                txd->addr = cpu_to_le64(first_mapping);
                wmb();
 
-               if (skb->ip_summed == CHECKSUM_PARTIAL) {
+               ctrl = first_eor | first_len | FirstFrag | DescOwn;
+               if (mss)
+                       ctrl |= LargeSend | ((mss & MSSMask) << MSSShift);
+               else if (skb->ip_summed == CHECKSUM_PARTIAL) {
                        if (ip->protocol == IPPROTO_TCP)
-                               txd->opts1 = cpu_to_le32(first_eor | first_len |
-                                                        FirstFrag | DescOwn |
-                                                        IPCS | TCPCS);
+                               ctrl |= IPCS | TCPCS;
                        else if (ip->protocol == IPPROTO_UDP)
-                               txd->opts1 = cpu_to_le32(first_eor | first_len |
-                                                        FirstFrag | DescOwn |
-                                                        IPCS | UDPCS);
+                               ctrl |= IPCS | UDPCS;
                        else
                                BUG();
-               } else
-                       txd->opts1 = cpu_to_le32(first_eor | first_len |
-                                                FirstFrag | DescOwn);
+               }
+
+               txd->opts1 = cpu_to_le32(ctrl);
                wmb();
 
                netif_dbg(cp, tx_queued, cp->dev, "tx queued, slots %d-%d, skblen %d\n",