package/openpowerlink: avoid kernel header issue with musl

The Virtual Ethernet driver doesn't build when the musl libc is used on the
system. As stated in the musl wiki [1], the userspace and kernel headers are
mixed leading to a "clash" with the definitions provided by musl.

Remove netinet/if_ether.h userspace header and replace ETHER_ADDR_LEN by
ETH_ALEN [2] and ETHERMTU by ETH_DATA_LEN [3] in veth-linuxuser.c.

Fixes:
http://autobuild.buildroot.org/results/2ca/2ca04bb046263e479e7597867b56469893d3c11d/

Upsteam status: pending
https://github.com/OpenAutomationTechnologies/openPOWERLINK_V2/pull/120

[Rebase on v2.2.2]
[1] http://wiki.musl-libc.org/wiki/FAQ#Q:_why_am_i_getting_.22error:_redefinition_of_struct_ethhdr.2Ftcphdr.2Fetc.22_.3F
[2] https://git.musl-libc.org/cgit/musl/tree/include/net/ethernet.h?h=v1.1.14#n35
[3] https://git.musl-libc.org/cgit/musl/tree/include/net/ethernet.h?h=v1.1.14#n48

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/openpowerlink/0006-veth-avoid-kernel-header-issue-with-musl.patch

@@ -0,0 +1,91 @@
+From 42a95209c5650662b86d222678ec14e7edfae156 Mon Sep 17 00:00:00 2001
+From: Romain Naour <romain.naour@gmail.com>
+Date: Wed, 25 May 2016 13:26:49 +0200
+Subject: [PATCH] veth: avoid kernel header issue with musl
+
+The Virtual Ethernet driver doesn't build when the musl libc is used on the
+system. As stated in the musl wiki [1], the userspace and kernel headers are
+mixed leading to a "clash" with the definitions provided by musl.
+
+Remove netinet/if_ether.h userspace header and replace ETHER_ADDR_LEN by
+ETH_ALEN [2] and ETHERMTU by ETH_DATA_LEN [3] in veth-linuxuser.c.
+
+Fixes:
+http://autobuild.buildroot.org/results/2ca/2ca04bb046263e479e7597867b56469893d3c11d/build-end.log
+
+Upsteam status: pending
+https://github.com/OpenAutomationTechnologies/openPOWERLINK_V2/pull/120
+
+[Rebase on v2.2.2]
+[1] http://wiki.musl-libc.org/wiki/FAQ#Q:_why_am_i_getting_.22error:_redefinition_of_struct_ethhdr.2Ftcphdr.2Fetc.22_.3F
+[2] https://git.musl-libc.org/cgit/musl/tree/include/net/ethernet.h?h=v1.1.14#n35
+[3] https://git.musl-libc.org/cgit/musl/tree/include/net/ethernet.h?h=v1.1.14#n48
+
+Signed-off-by: Romain Naour <romain.naour@gmail.com>
+---
+ stack/src/kernel/veth/veth-linuxuser.c | 13 ++++++-------
+ 1 file changed, 6 insertions(+), 7 deletions(-)
+
+diff --git a/stack/src/kernel/veth/veth-linuxuser.c b/stack/src/kernel/veth/veth-linuxuser.c
+index 2a0bdd0..2bfaa87 100644
+--- a/stack/src/kernel/veth/veth-linuxuser.c
++++ b/stack/src/kernel/veth/veth-linuxuser.c
+@@ -61,7 +61,6 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ #include <arpa/inet.h>
+ #include <linux/if.h>
+ #include <linux/if_tun.h>
+-#include <netinet/if_ether.h>
+ 
+ //============================================================================//
+ //            G L O B A L   D E F I N I T I O N S                             //
+@@ -248,7 +247,7 @@ static void getMacAdrs(UINT8* pMac_p)
+ 
+     close(sock);
+ 
+-    OPLK_MEMCPY(pMac_p, &ifr.ifr_hwaddr.sa_data[0], ETHER_ADDR_LEN);
++    OPLK_MEMCPY(pMac_p, &ifr.ifr_hwaddr.sa_data[0], ETH_ALEN);
+ }
+ 
+ //------------------------------------------------------------------------------
+@@ -272,9 +271,9 @@ static tOplkError veth_receiveFrame(tFrameInfo* pFrameInfo_p,
+ 
+     // replace the MAC address of the POWERLINK Ethernet interface with virtual
+     // Ethernet MAC address before forwarding it into the virtual Ethernet interface
+-    if (OPLK_MEMCMP(pFrameInfo_p->pFrame->aDstMac, vethInstance_l.macAdrs, ETHER_ADDR_LEN) == 0)
++    if (OPLK_MEMCMP(pFrameInfo_p->pFrame->aDstMac, vethInstance_l.macAdrs, ETH_ALEN) == 0)
+     {
+-        OPLK_MEMCPY(pFrameInfo_p->pFrame->aDstMac, vethInstance_l.tapMacAdrs, ETHER_ADDR_LEN);
++        OPLK_MEMCPY(pFrameInfo_p->pFrame->aDstMac, vethInstance_l.tapMacAdrs, ETH_ALEN);
+     }
+ 
+     nwrite = write(vethInstance_l.fd, pFrameInfo_p->pFrame, pFrameInfo_p->frameSize);
+@@ -302,7 +301,7 @@ to be used as a thread which does a blocking read in a while loop.
+ //------------------------------------------------------------------------------
+ static void* vethRecvThread(void* pArg_p)
+ {
+-    UINT8               buffer[ETHERMTU];
++    UINT8               buffer[ETH_DATA_LEN];
+     UINT                nread;
+     tFrameInfo          frameInfo;
+     tOplkError          ret = kErrorOk;
+@@ -331,7 +330,7 @@ static void* vethRecvThread(void* pArg_p)
+                 break;
+ 
+             default:    // data from tun/tap ready for read
+-                nread = read(pInstance->fd, buffer, ETHERMTU);
++                nread = read(pInstance->fd, buffer, ETH_DATA_LEN);
+                 if (nread > 0)
+                 {
+                     DEBUG_LVL_VETH_TRACE("VETH:Read %d bytes from the tap interface\n", nread);
+@@ -340,7 +339,7 @@ static void* vethRecvThread(void* pArg_p)
+                     DEBUG_LVL_VETH_TRACE("DST MAC: %02X:%02X:%02x:%02X:%02X:%02x\n",
+                                           buffer[0], buffer[1], buffer[2], buffer[3], buffer[4], buffer[5]);
+                     // replace src MAC address with MAC address of virtual Ethernet interface
+-                    OPLK_MEMCPY(&buffer[6], pInstance->macAdrs, ETHER_ADDR_LEN);
++                    OPLK_MEMCPY(&buffer[6], pInstance->macAdrs, ETH_ALEN);
+ 
+                     frameInfo.pFrame = (tPlkFrame *)buffer;
+                     frameInfo.frameSize = nread;
+-- 
+2.5.5
+