[netdevice] Add netdev argument to link-layer push and pull handlers

In order to construct outgoing link-layer frames or parse incoming
ones properly, some protocols (such as 802.11) need more state than is
available in the existing variables passed to the link-layer protocol
handlers. To remedy this, add struct net_device *netdev as the first
argument to each of these functions, so that more information can be
fetched from the link layer-private part of the network device.

Updated all three call sites (netdevice.c, efi_snp.c, pxe_undi.c) and
both implementations (ethernet.c, ipoib.c) of ll_protocol to use the
new argument.

Signed-off-by: Michael Brown <mcb30@etherboot.org>

src/arch/i386/interface/pxe/pxe_undi.c

@@ -270,7 +270,7 @@ PXENV_EXIT_t pxenv_undi_transmit ( struct s_PXENV_UNDI_TRANSMIT
 		}
 
 		/* Add link-layer header */
-		if ( ( rc = ll_protocol->push ( iobuf, ll_dest,
+		if ( ( rc = ll_protocol->push ( pxe_netdev, iobuf, ll_dest,
 						pxe_netdev->ll_addr,
 						net_protocol->net_proto ))!=0){
 			free_iob ( iobuf );
@@ -630,8 +630,8 @@ PXENV_EXIT_t pxenv_undi_isr ( struct s_PXENV_UNDI_ISR *undi_isr ) {
 
 		/* Strip link-layer header */
 		ll_protocol = pxe_netdev->ll_protocol;
-		if ( ( rc = ll_protocol->pull ( iobuf, &ll_dest, &ll_source,
-						&net_proto ) ) != 0 ) {
+		if ( ( rc = ll_protocol->pull ( pxe_netdev, iobuf, &ll_dest,
+						&ll_source, &net_proto )) !=0){
 			/* Assume unknown net_proto and no ll_source */
 			net_proto = 0;
 			ll_source = NULL;

src/drivers/net/ipoib.c

@@ -238,13 +238,15 @@ ipoib_cache_peer ( const struct ib_gid *gid, unsigned long qpn ) {
 /**
  * Add IPoIB link-layer header
  *
+ * @v netdev		Network device
  * @v iobuf		I/O buffer
  * @v ll_dest		Link-layer destination address
  * @v ll_source		Source link-layer address
  * @v net_proto		Network-layer protocol, in network-byte order
  * @ret rc		Return status code
  */
-static int ipoib_push ( struct io_buffer *iobuf, const void *ll_dest,
+static int ipoib_push ( struct net_device *netdev __unused,
+			struct io_buffer *iobuf, const void *ll_dest,
 			const void *ll_source __unused, uint16_t net_proto ) {
 	struct ipoib_hdr *ipoib_hdr =
 		iob_push ( iobuf, sizeof ( *ipoib_hdr ) );
@@ -268,13 +270,15 @@ static int ipoib_push ( struct io_buffer *iobuf, const void *ll_dest,
 /**
  * Remove IPoIB link-layer header
  *
+ * @v netdev		Network device
  * @v iobuf		I/O buffer
  * @ret ll_dest		Link-layer destination address
  * @ret ll_source	Source link-layer address
  * @ret net_proto	Network-layer protocol, in network-byte order
  * @ret rc		Return status code
  */
-static int ipoib_pull ( struct io_buffer *iobuf, const void **ll_dest,
+static int ipoib_pull ( struct net_device *netdev __unused,
+			struct io_buffer *iobuf, const void **ll_dest,
 			const void **ll_source, uint16_t *net_proto ) {
 	struct ipoib_hdr *ipoib_hdr = iobuf->data;
 	struct ipoib_peer *dest;

src/include/gpxe/netdevice.h

@@ -88,25 +88,29 @@ struct ll_protocol {
 	/**
 	 * Add link-layer header
 	 *
+	 * @v netdev		Network device
 	 * @v iobuf		I/O buffer
 	 * @v ll_dest		Link-layer destination address
 	 * @v ll_source		Source link-layer address
 	 * @v net_proto		Network-layer protocol, in network-byte order
 	 * @ret rc		Return status code
 	 */
-	int ( * push ) ( struct io_buffer *iobuf, const void *ll_dest,
-			 const void *ll_source, uint16_t net_proto );
+	int ( * push ) ( struct net_device *netdev, struct io_buffer *iobuf,
+			 const void *ll_dest, const void *ll_source,
+			 uint16_t net_proto );
 	/**
 	 * Remove link-layer header
 	 *
+	 * @v netdev		Network device
 	 * @v iobuf		I/O buffer
 	 * @ret ll_dest		Link-layer destination address
 	 * @ret ll_source	Source link-layer address
 	 * @ret net_proto	Network-layer protocol, in network-byte order
 	 * @ret rc		Return status code
 	 */
-	int ( * pull ) ( struct io_buffer *iobuf, const void **ll_dest,
-			 const void **ll_source, uint16_t *net_proto );
+	int ( * pull ) ( struct net_device *netdev, struct io_buffer *iobuf,
+			 const void **ll_dest, const void **ll_source,
+			 uint16_t *net_proto );
 	/**
 	 * Transcribe link-layer address
 	 *

src/interface/efi/efi_snp.c

@@ -594,7 +594,8 @@ efi_snp_transmit ( EFI_SIMPLE_NETWORK_PROTOCOL *snp,
 	/* Create link-layer header, if specified */
 	if ( ll_header_len ) {
 		iob_pull ( iobuf, ll_header_len );
-		if ( ( rc = ll_protocol->push ( iobuf, ll_dest, ll_src,
+		if ( ( rc = ll_protocol->push ( snpdev->netdev,
+						iobuf, ll_dest, ll_src,
 						htons ( *net_proto ) )) != 0 ){
 			DBGC ( snpdev, "SNPDEV %p TX could not construct "
 			       "header: %s\n", snpdev, strerror ( rc ) );
@@ -672,8 +673,8 @@ efi_snp_receive ( EFI_SIMPLE_NETWORK_PROTOCOL *snp,
 	*len = iob_len ( iobuf );
 
 	/* Attempt to decode link-layer header */
-	if ( ( rc = ll_protocol->pull ( iobuf, &iob_ll_dest, &iob_ll_src,
-					&iob_net_proto ) ) != 0 ) {
+	if ( ( rc = ll_protocol->pull ( snpdev->netdev, iobuf, &iob_ll_dest,
+					&iob_ll_src, &iob_net_proto ) ) != 0 ){
 		DBGC ( snpdev, "SNPDEV %p could not parse header: %s\n",
 		       snpdev, strerror ( rc ) );
 		efirc = RC_TO_EFIRC ( rc );

src/net/ethernet.c

@@ -43,13 +43,15 @@ static uint8_t eth_broadcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 /**
  * Add Ethernet link-layer header
  *
+ * @v netdev		Network device
  * @v iobuf		I/O buffer
  * @v ll_dest		Link-layer destination address
  * @v ll_source		Source link-layer address
  * @v net_proto		Network-layer protocol, in network-byte order
  * @ret rc		Return status code
  */
-static int eth_push ( struct io_buffer *iobuf, const void *ll_dest,
+static int eth_push ( struct net_device *netdev __unused,
+		      struct io_buffer *iobuf, const void *ll_dest,
 		      const void *ll_source, uint16_t net_proto ) {
 	struct ethhdr *ethhdr = iob_push ( iobuf, sizeof ( *ethhdr ) );
 
@@ -64,13 +66,15 @@ static int eth_push ( struct io_buffer *iobuf, const void *ll_dest,
 /**
  * Remove Ethernet link-layer header
  *
+ * @v netdev		Network device
  * @v iobuf		I/O buffer
  * @ret ll_dest		Link-layer destination address
  * @ret ll_source	Source link-layer address
  * @ret net_proto	Network-layer protocol, in network-byte order
  * @ret rc		Return status code
  */
-static int eth_pull ( struct io_buffer *iobuf, const void **ll_dest,
+static int eth_pull ( struct net_device *netdev __unused, 
+		      struct io_buffer *iobuf, const void **ll_dest,
 		      const void **ll_source, uint16_t *net_proto ) {
 	struct ethhdr *ethhdr = iobuf->data;
 

src/net/netdevice.c

@@ -509,7 +509,7 @@ int net_tx ( struct io_buffer *iobuf, struct net_device *netdev,
 	netdev_poll ( netdev );
 
 	/* Add link-layer header */
-	if ( ( rc = ll_protocol->push ( iobuf, ll_dest, netdev->ll_addr,
+	if ( ( rc = ll_protocol->push ( netdev, iobuf, ll_dest, netdev->ll_addr,
 					net_protocol->net_proto ) ) != 0 ) {
 		free_iob ( iobuf );
 		return rc;
@@ -581,8 +581,8 @@ static void net_step ( struct process *process __unused ) {
 
 			/* Remove link-layer header */
 			ll_protocol = netdev->ll_protocol;
-			if ( ( rc = ll_protocol->pull ( iobuf, &ll_dest,
-							&ll_source,
+			if ( ( rc = ll_protocol->pull ( netdev, iobuf,
+							&ll_dest, &ll_source,
 							&net_proto ) ) != 0 ) {
 				free_iob ( iobuf );
 				continue;