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[ipoib] Clarify new role of IPoIB peer cache as for MAC addresses only

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Now that path record lookups are handled entirely via
ib_resolve_path(), the only role of the IPoIB peer cache is as a
lookup table for MAC addresses.  Update the code structure and
comments to reflect this.
This commit is contained in:
Michael Brown 2009-07-07 13:54:39 +01:00
parent 06ad481904
commit 8aa2591c06
1 changed files with 21 additions and 39 deletions
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60
src/drivers/net/ipoib.c
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@ -100,8 +100,12 @@ static struct ipoib_mac ipoib_broadcast = {
/**
* IPoIB peer address
*
* This serves a similar role to the ARP cache for Ethernet. (ARP
* *is* used on IPoIB; we have two caches to maintain.)
* The IPoIB link-layer header is only four bytes long and so does not
* have sufficient room to store IPoIB MAC address(es). We therefore
* maintain a cache of MAC addresses identified by a single-byte key,
* and abuse the spare two bytes within the link-layer header to
* communicate these MAC addresses between the link-layer code and the
* netdevice driver.
*/
struct ipoib_peer {
/** Key */
@ -145,28 +149,6 @@ static struct ipoib_peer * ipoib_lookup_peer_by_key ( unsigned int key ) {
return NULL;
}
/**
* Look up cached peer by GID
*
* @v gid Peer GID
* @ret peer Peer cache entry, or NULL
*/
static struct ipoib_peer *
ipoib_lookup_peer_by_gid ( const struct ib_gid *gid ) {
struct ipoib_peer *peer;
unsigned int i;
for ( i = 0 ; i < IPOIB_NUM_CACHED_PEERS ; i++ ) {
peer = &ipoib_peer_cache[i];
if ( memcmp ( &peer->mac.gid, gid,
sizeof ( peer->mac.gid) ) == 0 ) {
return peer;
}
}
return NULL;
}
/**
* Store GID and QPN in peer cache
*
@ -174,16 +156,16 @@ ipoib_lookup_peer_by_gid ( const struct ib_gid *gid ) {
* @v qpn Peer QPN
* @ret peer Peer cache entry
*/
static struct ipoib_peer *
ipoib_cache_peer ( const struct ib_gid *gid, unsigned long qpn ) {
static struct ipoib_peer * ipoib_cache_peer ( const struct ipoib_mac *mac ) {
struct ipoib_peer *peer;
unsigned int key;
unsigned int i;
/* Look for existing cache entry */
peer = ipoib_lookup_peer_by_gid ( gid );
if ( peer ) {
assert ( peer->mac.qpn = ntohl ( qpn ) );
return peer;
for ( i = 0 ; i < IPOIB_NUM_CACHED_PEERS ; i++ ) {
peer = &ipoib_peer_cache[i];
if ( memcmp ( &peer->mac, mac, sizeof ( peer->mac ) ) == 0 )
return peer;
}
/* No entry found: create a new one */
@ -194,12 +176,9 @@ ipoib_cache_peer ( const struct ib_gid *gid, unsigned long qpn ) {
memset ( peer, 0, sizeof ( *peer ) );
peer->key = key;
peer->mac.qpn = htonl ( qpn );
memcpy ( &peer->mac.gid, gid, sizeof ( peer->mac.gid ) );
DBG ( "IPoIB peer %x has GID %08x:%08x:%08x:%08x and QPN %lx\n",
peer->key, htonl ( gid->u.dwords[0] ),
htonl ( gid->u.dwords[1] ), htonl ( gid->u.dwords[2] ),
htonl ( gid->u.dwords[3] ), qpn );
memcpy ( &peer->mac, mac, sizeof ( peer->mac ) );
DBG ( "IPoIB peer %x has MAC %s\n",
peer->key, ipoib_ntoa ( &peer->mac ) );
return peer;
}
@ -231,8 +210,8 @@ static int ipoib_push ( struct net_device *netdev __unused,
struct ipoib_peer *src;
/* Add link-layer addresses to cache */
dest = ipoib_cache_peer ( &dest_mac->gid, ntohl ( dest_mac->qpn ) );
src = ipoib_cache_peer ( &src_mac->gid, ntohl ( src_mac->qpn ) );
dest = ipoib_cache_peer ( dest_mac );
src = ipoib_cache_peer ( src_mac );
/* Build IPoIB header */
ipoib_hdr->proto = net_proto;
@ -497,6 +476,7 @@ static void ipoib_data_complete_recv ( struct ib_device *ibdev __unused,
struct ipoib_device *ipoib = ib_qp_get_ownerdata ( qp );
struct net_device *netdev = ipoib->netdev;
struct ipoib_hdr *ipoib_hdr;
struct ipoib_mac ll_src;
struct ipoib_peer *src;
if ( rc != 0 ) {
@ -516,7 +496,9 @@ static void ipoib_data_complete_recv ( struct ib_device *ibdev __unused,
/* Parse source address */
if ( av->gid_present ) {
src = ipoib_cache_peer ( &av->gid, av->qpn );
ll_src.qpn = htonl ( av->qpn );
memcpy ( &ll_src.gid, &av->gid, sizeof ( ll_src.gid ) );
src = ipoib_cache_peer ( &ll_src );
ipoib_hdr->u.peer.src = src->key;
}