Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / llc / llc_output.c

diff --git a/kernel/net/llc/llc_output.c b/kernel/net/llc/llc_output.c
new file mode 100644 (file)
index 0000000..94425e4
--- /dev/null
+++ b/kernel/net/llc/llc_output.c
@@ -0,0 +1,79 @@
+/*
+ * llc_output.c - LLC minimal output path
+ *
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ *              2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * This program can be redistributed or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation.
+ * This program is distributed without any warranty or implied warranty
+ * of merchantability or fitness for a particular purpose.
+ *
+ * See the GNU General Public License version 2 for more details.
+ */
+
+#include <linux/if_arp.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/export.h>
+#include <net/llc.h>
+#include <net/llc_pdu.h>
+
+/**
+ *     llc_mac_hdr_init - fills MAC header fields
+ *     @skb: Address of the frame to initialize its MAC header
+ *     @sa: The MAC source address
+ *     @da: The MAC destination address
+ *
+ *     Fills MAC header fields, depending on MAC type. Returns 0, If MAC type
+ *     is a valid type and initialization completes correctly 1, otherwise.
+ */
+int llc_mac_hdr_init(struct sk_buff *skb,
+                    const unsigned char *sa, const unsigned char *da)
+{
+       int rc = -EINVAL;
+
+       switch (skb->dev->type) {
+       case ARPHRD_ETHER:
+       case ARPHRD_LOOPBACK:
+               rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa,
+                                    skb->len);
+               if (rc > 0)
+                       rc = 0;
+               break;
+       default:
+               break;
+       }
+       return rc;
+}
+
+/**
+ *     llc_build_and_send_ui_pkt - unitdata request interface for upper layers
+ *     @sap: sap to use
+ *     @skb: packet to send
+ *     @dmac: destination mac address
+ *     @dsap: destination sap
+ *
+ *     Upper layers calls this function when upper layer wants to send data
+ *     using connection-less mode communication (UI pdu).
+ *
+ *     Accept data frame from network layer to be sent using connection-
+ *     less mode communication; timeout/retries handled by network layer;
+ *     package primitive as an event and send to SAP event handler
+ */
+int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
+                             unsigned char *dmac, unsigned char dsap)
+{
+       int rc;
+       llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap,
+                           dsap, LLC_PDU_CMD);
+       llc_pdu_init_as_ui_cmd(skb);
+       rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
+       if (likely(!rc))
+               rc = dev_queue_xmit(skb);
+       return rc;
+}
+
+EXPORT_SYMBOL(llc_mac_hdr_init);
+EXPORT_SYMBOL(llc_build_and_send_ui_pkt);