qeth: exploit source MAC address for inbound layer3 packets

OSA-devices operating in layer3 mode offer adding of the source MAC
address to the QDIO header of inbound packets. The qeth driver can
exploit this functionality to replace FAKELL-entries in the ethernet
header of received packets.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 9 insertions, 9 deletions

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index d5ccce1643e4..e0c45574b0c8 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -643,7 +643,6 @@ struct qeth_card_options {
         int macaddr_mode;
         int fake_broadcast;
         int add_hhlen;
-        int fake_ll;
         int layer2;
         enum qeth_large_send_types large_send;
         int performance_stats;
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index ef6c225227cb..89867bc43f7a 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1072,7 +1072,6 @@ static void qeth_set_intial_options(struct qeth_card *card)
         card->options.macaddr_mode = QETH_TR_MACADDR_NONCANONICAL;
         card->options.fake_broadcast = 0;
         card->options.add_hhlen = DEFAULT_ADD_HHLEN;
-        card->options.fake_ll = 0;
         card->options.performance_stats = 0;
         card->options.rx_sg_cb = QETH_RX_SG_CB;
 }
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index c0b30b25a5f1..cdd6ab9c894d 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1207,12 +1207,9 @@ static int qeth_l3_start_ipa_source_mac(struct qeth_card *card)
 
         QETH_DBF_TEXT(TRACE, 3, "stsrcmac");
 
-        if (!card->options.fake_ll)
-                return -EOPNOTSUPP;
-
         if (!qeth_is_supported(card, IPA_SOURCE_MAC)) {
                 dev_info(&card->gdev->dev,
-                        "Inbound source address not supported on %s\n",
+                        "Inbound source MAC-address not supported on %s\n",
                         QETH_CARD_IFNAME(card));
                 return -EOPNOTSUPP;
         }
@@ -1221,7 +1218,7 @@ static int qeth_l3_start_ipa_source_mac(struct qeth_card *card)
                                           IPA_CMD_ASS_START, 0);
         if (rc)
                 dev_warn(&card->gdev->dev,
-                        "Starting proxy ARP support for %s failed\n",
+                        "Starting source MAC-address support for %s failed\n",
                         QETH_CARD_IFNAME(card));
         return rc;
 }
@@ -1921,8 +1918,13 @@ static inline __u16 qeth_l3_rebuild_skb(struct qeth_card *card,
                         memcpy(tg_addr, card->dev->dev_addr,
                                 card->dev->addr_len);
                 }
-                card->dev->header_ops->create(skb, card->dev, prot, tg_addr,
-                                              "FAKELL", card->dev->addr_len);
+                if (hdr->hdr.l3.ext_flags & QETH_HDR_EXT_SRC_MAC_ADDR)
+                        card->dev->header_ops->create(skb, card->dev, prot,
+                                tg_addr, &hdr->hdr.l3.dest_addr[2],
+                                card->dev->addr_len);
+                else
+                        card->dev->header_ops->create(skb, card->dev, prot,
+                                tg_addr, "FAKELL", card->dev->addr_len);
         }
 
 #ifdef CONFIG_TR