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net: mctp: Use hashtable for binds

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Ensure that a specific EID (remote or local) bind will match in
preference to a MCTP_ADDR_ANY bind.

This adds infrastructure for binding a socket to receive messages from a
specific remote peer address, a future commit will expose an API for
this.

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Link: https://patch.msgid.link/20250710-mctp-bind-v4-5-8ec2f6460c56@codeconstruct.com.au
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Matt Johnston
2025-07-10 16:55:58 +08:00
committed by Paolo Abeni
parent 4ec4b7fc04
commit 1aeed732f4
3 changed files with 87 additions and 25 deletions
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20
include/net/netns/mctp.h
View File

@@ -6,19 +6,25 @@
#ifndef __NETNS_MCTP_H__
#define __NETNS_MCTP_H__
#include <linux/hash.h>
#include <linux/hashtable.h>
#include <linux/mutex.h>
#include <linux/types.h>
#define MCTP_BINDS_BITS 7
struct netns_mctp {
/* Only updated under RTNL, entries freed via RCU */
struct list_head routes;
/* Bound sockets: list of sockets bound by type.
* This list is updated from non-atomic contexts (under bind_lock),
* and read (under rcu) in packet rx
/* Bound sockets: hash table of sockets, keyed by
* (type, src_eid, dest_eid).
* Specific src_eid/dest_eid entries also have an entry for
* MCTP_ADDR_ANY. This list is updated from non-atomic contexts
* (under bind_lock), and read (under rcu) in packet rx.
*/
struct mutex bind_lock;
struct hlist_head binds;
DECLARE_HASHTABLE(binds, MCTP_BINDS_BITS);
/* tag allocations. This list is read and updated from atomic contexts,
* but elements are free()ed after a RCU grace-period
@@ -34,4 +40,10 @@ struct netns_mctp {
struct list_head neighbours;
};
static inline u32 mctp_bind_hash(u8 type, u8 local_addr, u8 peer_addr)
{
return hash_32(type | (u32)local_addr << 8 | (u32)peer_addr << 16,
MCTP_BINDS_BITS);
}
#endif /* __NETNS_MCTP_H__ */