qlge: bugfix: Increase filter on inbound csum.

Chip does not do UDP checksum when fragmentation occurs.

Signed-off-by: Ron Mercer <ron.mercer@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 12 deletions

diff --git a/drivers/net/qlge/qlge_main.c b/drivers/net/qlge/qlge_main.c
index 8ea72dc60f79..87787b1ecab2 100644
--- a/drivers/net/qlge/qlge_main.c
+++ b/drivers/net/qlge/qlge_main.c
@@ -1436,18 +1436,32 @@ static void ql_process_mac_rx_intr(struct ql_adapter *qdev,
         if (ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_P) {
                 QPRINTK(qdev, RX_STATUS, DEBUG, "Promiscuous Packet.\n");
         }
-        if (ib_mac_rsp->flags1 & (IB_MAC_IOCB_RSP_IE | IB_MAC_IOCB_RSP_TE)) {
-                QPRINTK(qdev, RX_STATUS, ERR,
-                        "Bad checksum for this %s packet.\n",
-                        ((ib_mac_rsp->
-                          flags2 & IB_MAC_IOCB_RSP_T) ? "TCP" : "UDP"));
-                skb->ip_summed = CHECKSUM_NONE;
-        } else if (qdev->rx_csum &&
-                   ((ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_T) ||
-                    ((ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_U) &&
-                     !(ib_mac_rsp->flags1 & IB_MAC_IOCB_RSP_NU)))) {
-                QPRINTK(qdev, RX_STATUS, DEBUG, "RX checksum done!\n");
-                skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+        skb->protocol = eth_type_trans(skb, ndev);
+        skb->ip_summed = CHECKSUM_NONE;
+
+        /* If rx checksum is on, and there are no
+         * csum or frame errors.
+         */
+        if (qdev->rx_csum &&
+                !(ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_ERR_MASK) &&
+                !(ib_mac_rsp->flags1 & IB_MAC_CSUM_ERR_MASK)) {
+                /* TCP frame. */
+                if (ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_T) {
+                        QPRINTK(qdev, RX_STATUS, DEBUG,
+                                        "TCP checksum done!\n");
+                        skb->ip_summed = CHECKSUM_UNNECESSARY;
+                } else if ((ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_U) &&
+                                (ib_mac_rsp->flags3 & IB_MAC_IOCB_RSP_V4)) {
+                /* Unfragmented ipv4 UDP frame. */
+                        struct iphdr *iph = (struct iphdr *) skb->data;
+                        if (!(iph->frag_off &
+                                cpu_to_be16(IP_MF|IP_OFFSET))) {
+                                skb->ip_summed = CHECKSUM_UNNECESSARY;
+                                QPRINTK(qdev, RX_STATUS, DEBUG,
+                                                "TCP checksum done!\n");
+                        }
+                }
         }
         qdev->stats.rx_packets++;
         qdev->stats.rx_bytes += skb->len;