Memory window access mechanism

• US 7,565,504 B2
• Filed: 03/27/2003
• Issued: 07/21/2009
• Est. Priority Date: 03/27/2003
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Garcia, David J., Culley, Paul R., Hilland, Jeffrey R.
• Primary Examiner(s): Thai; Tuan V
• Assistant Examiner(s): SAVLA, ARPAN P
• Application Number:
  US10/401,234
• Publication Number:
  US 20040193908A1
• Time in Patent Office: 2,308 Days
• Field of Search: 711/153, 711/154, 711/163, 711/164, 709/213, 709/215, 709/226
• US Class Current: 711/163
• CPC Class Codes: G06F 12/145 the protection being virtual, e.g. for virtual blocks or segments before a translation mechanism
• CPC Class Codes: G06F 12/1458 by checking the subject access rights

Abstract

The disclosed embodiments may relate to memory window access, which may include a memory window and protection domain associated with a process. The memory window access setting or bit may also allow a plurality of memory windows to be associated with a protection domain for a process. The memory window access setting or bit may allow access to the memory window to be for the queue pairs in a certain protection domain or a designated queue pair.

Claims

1. A memory window access mechanism, comprising:

a protection domain;

a memory window associated with the protection domain;

a plurality of queue pairs, each of the plurality of queue pairs being associated with the protection domain;

an attribute associated with the memory window that enables access to the memory window only by a single one of the plurality of queue pairs; and

a context associated with the single one of the plurality of queue pairs, wherein the context includes information relating to a protection domain, access rights, send queue information, receive queue information, completion queue information, or information about a local port connected to the queue pair and/or remote port connected to the queue pair, or a combination thereof,

wherein the attribute can be disabled such that access to the memory window can only be granted by validating that the protection domain associated with the memory window matches against the context, and wherein if the matching between the context and the protection domain is not validated the access to the memory window is terminated.

2. The memory window access mechanism set forth in claim 1 wherein the attribute is defined in a translation and protection table (“

TPT”

).

3. The memory window access mechanism set forth in claim 2, wherein the attribute includes an identifying value associated with the single one of the plurality of queue pairs.

4. The memory window access mechanism set forth in claim 1, wherein the attribute comprises a bit that defines whether to allow access to the memory window by the plurality of queue pairs or only by the single one of the plurality of queue pairs.

5. The memory window access mechanism set forth in claim 1, wherein a verb defines the single one of the plurality of queue pairs.

6. The memory window access mechanism set forth in claim 1, wherein access to the memory window is permitted if a requesting device corresponding only to the single one of the plurality of queue pairs issues a request to access the memory window.

7. The memory window access mechanism set forth in claim 1, wherein access to the memory window is permitted if a requesting queue pair corresponding only to the single one of the plurality of queue pairs issues a request to access the memory window.

8. A computer network, comprising:

a plurality of computer systems;

at least one input/output device;

a switch network that connects the plurality of computer systems and the at least one input/output device for communication; and

wherein the plurality of computer systems and the at least one input/output device comprises a memory window access mechanism, the memory window access mechanism comprising;

a protection domain;

a memory window associated with the protection domain;

a plurality of queue pairs, each of the plurality of queue pairs being associated with the protection domain;

an attribute associated with the memory window that enables access to the memory window only by a single one of the plurality of queue pairs; and

a context associated with the single one of the plurality of queue pairs, wherein the context includes information relating to a protection domain, access rights, send queue information, receive queue information, completion queue information, or information about a local port connected to the queue pair and/or remote port connected to the queue pair, or a combination thereof,

wherein the attribute can be disabled such that access to the memory window can only be granted by validating that the protection domain associated with the memory window matches against the context, and wherein if the matching between the context and the protection domain is not validated the access to the memory window is terminated.

9. The computer network set forth in claim 8 wherein the attribute is defined in a translation and protection table (“

TPT”

).

10. The computer network set forth in claim 9, wherein the attribute includes an identifying value associated with the single one of the plurality of queue pairs.

11. The computer network set forth in claim 8, wherein the attribute comprises a bit that defines whether to allow access to the memory window from only the single one of the plurality of queue pairs or the plurality of queue pairs.

12. The computer network set forth in claim 8, wherein a verb defines the single one of the plurality of queue pairs.

13. The computer network set forth in claim 8, wherein access to the memory window is permitted if a requesting device corresponding only to the single one of the plurality of queue pairs issues a request to access the memory window.

14. The computer network set forth in claim 8, wherein access to the memory window is permitted if a requesting queue pair corresponding only to the single one of the plurality of queue pairs issues a request to access the memory window.

15. A method for providing access to a memory window, the method comprising the acts of:

creating a protection domain;

defining a plurality of queue pairs, each of the plurality of queue pairs being associated with the protection domain;

binding a memory window associated with the protection domain, the memory window having an attribute that enables access thereto only by a single one of the plurality of queue pairs;

setting the attribute to enable access to the memory window only by the single one of the plurality of queue pairs;

validating that the protection domain associated with the memory window matches against a context associated with the single one of the plurality of queue pairs if the setting of the attribute is not enabled, wherein the context includes information relating to a protection domain, access rights, send queue information, receive queue information, completion queue information, or information about a local port connected to the queue pair and/or remote port connected to the queue pair, or a combination thereof; and

terminating access to the memory window if both the setting of the attribute is not enabled and the matching between the protection domain and the context associated with the queue pair cannot be validated.

16. The method set forth in claim 15, comprising defining the attribute in a translation and protection table (“

TPT”

).

17. The method set forth in claim 15, comprising defining a value associated with the single one of the plurality of queue pairs.

18. The method set forth in claim 15, comprising defining a bit that defines whether to allow access to the memory window from only the single one of the plurality of queue pairs or the plurality of queue pairs.

19. The method set forth in claim 15, comprising defining the single one of the plurality of queue pairs with a verb.

20. The method set forth in claim 15, comprising permitting access to the memory window if a requesting device corresponding only to the single one of the plurality of queue pairs issues a request to access the memory window.

21. The method set forth in claim 15, comprising permitting access to the memory window if a requesting queue pair corresponding only to the single one of the plurality of queue pairs issues a request to access the memory window.