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https://github.com/xcat2/xNBA.git
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Michael Brown
9a35830d1f
Some Infiniband cards will not be as accommodating as the Arbel and Hermon cards in providing enough space for us to push a fake extra header at the start of the received packet. We must therefore make do with squeezing enough information to identify source and destination addresses into the two bytes of padding within a genuine IPoIB link-layer header.
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
#ifndef _GPXE_IPOIB_H
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#define _GPXE_IPOIB_H
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/** @file
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*
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* IP over Infiniband
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*/
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#include <gpxe/infiniband.h>
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/** IPoIB packet length */
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#define IPOIB_PKT_LEN 2048
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/** IPoIB MAC address length */
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#define IPOIB_ALEN 20
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/** An IPoIB MAC address */
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struct ipoib_mac {
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/** Queue pair number
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*
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* MSB must be zero; QPNs are only 24-bit.
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*/
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uint32_t qpn;
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/** Port GID */
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struct ib_gid gid;
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} __attribute__ (( packed ));
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/** IPoIB link-layer header length */
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#define IPOIB_HLEN 4
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/** IPoIB link-layer header */
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struct ipoib_hdr {
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/** Network-layer protocol */
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uint16_t proto;
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/** Reserved, must be zero */
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union {
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/** Reserved, must be zero */
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uint16_t reserved;
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/** Peer addresses
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*
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* We use these fields internally to represent the
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* peer addresses using a lookup key. There simply
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* isn't enough room in the IPoIB header to store
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* literal source or destination MAC addresses.
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*/
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struct {
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/** Destination address key */
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uint8_t dest;
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/** Source address key */
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uint8_t src;
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} __attribute__ (( packed )) peer;
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} __attribute__ (( packed )) u;
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} __attribute__ (( packed ));
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extern struct ll_protocol ipoib_protocol;
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extern const char * ipoib_ntoa ( const void *ll_addr );
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/**
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* Allocate IPoIB device
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*
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* @v priv_size Size of driver private data
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* @ret netdev Network device, or NULL
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*/
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static inline struct net_device * alloc_ipoibdev ( size_t priv_size ) {
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struct net_device *netdev;
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netdev = alloc_netdev ( priv_size );
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if ( netdev ) {
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netdev->ll_protocol = &ipoib_protocol;
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netdev->max_pkt_len = IPOIB_PKT_LEN;
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}
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return netdev;
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}
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extern void ipoib_link_state_changed ( struct ib_device *ibdev );
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extern int ipoib_probe ( struct ib_device *ibdev );
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extern void ipoib_remove ( struct ib_device *ibdev );
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#endif /* _GPXE_IPOIB_H */
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