Patchwork [2/4] qeth: exploit source MAC address for inbound layer3 packets

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Submitter frank.blaschka@de.ibm.com
Date Dec. 11, 2008, 1:23 p.m.
Message ID <20081211132419.230735000@de.ibm.com>
Download mbox | patch
Permalink /patch/13429/
State Changes Requested
Delegated to: David Miller
Headers show

Comments

frank.blaschka@de.ibm.com - Dec. 11, 2008, 1:23 p.m.
From: Ursula Braun <ursula.braun@de.ibm.com>

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>
---

 drivers/s390/net/qeth_core.h      |    1 -
 drivers/s390/net/qeth_core_main.c |    1 -
 drivers/s390/net/qeth_l3_main.c   |   16 +++++++++-------
 3 files changed, 9 insertions(+), 9 deletions(-)

Patch

diff -urpN linux-2.6/drivers/s390/net/qeth_core.h linux-2.6-patched/drivers/s390/net/qeth_core.h
--- linux-2.6/drivers/s390/net/qeth_core.h	2008-12-11 11:23:10.000000000 +0100
+++ linux-2.6-patched/drivers/s390/net/qeth_core.h	2008-12-11 11:27:12.000000000 +0100
@@ -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 -urpN linux-2.6/drivers/s390/net/qeth_core_main.c linux-2.6-patched/drivers/s390/net/qeth_core_main.c
--- linux-2.6/drivers/s390/net/qeth_core_main.c	2008-12-11 11:27:12.000000000 +0100
+++ linux-2.6-patched/drivers/s390/net/qeth_core_main.c	2008-12-11 11:27:12.000000000 +0100
@@ -1072,7 +1072,6 @@  static void qeth_set_intial_options(stru
 	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 -urpN linux-2.6/drivers/s390/net/qeth_l3_main.c linux-2.6-patched/drivers/s390/net/qeth_l3_main.c
--- linux-2.6/drivers/s390/net/qeth_l3_main.c	2008-12-11 11:23:10.000000000 +0100
+++ linux-2.6-patched/drivers/s390/net/qeth_l3_main.c	2008-12-11 11:27:12.000000000 +0100
@@ -1207,12 +1207,9 @@  static int qeth_l3_start_ipa_source_mac(
 
 	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(
 					  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(
 			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