US007715410B2

(12) Unlted States Patent (10) Patent N0.: US 7,715,410 B2 Nemirovsky et a1. 45 Date of Patent: *Ma y 11 a 2010

(54) QUEUEING SYSTEM FOR PROCESSORS IN (52) US. Cl...... 370/395.7; 370/412; 710/52; PACKET ROUTING OPERATIONS 710/310; 711/154; 711/170 (58) Field of Classi?cation Search ...... None (75) Inventors: Mario Nemirovsky, Saratoga, CA (US); See application ?le for complete search history. Enric Mus0ll, San Jose, CA (US); . Stephen Melvin, San Francisco, CA (56) References Clted (US); Narendra Sankar, Santa Clara, U.S. PATENT DOCUMENTS CA (Us); Nandakumar samPath’ Santa 4,200,927 A 4/1980 Hughes et a1. Clara, CA (Us); Adolfo Nemlrovskys 4,707,784 A 11/1987 Ryan et a1. San Jose, CA (US) 4,942,518 A 7/1990 Weatherford et a1. (73) Assignee: MIPS Technologies, Inc., Sunnyvale, (Continued) CA (Us) FOREIGN PATENT DOCUMENTS ( * ) Notice: Subject to any disclaimer, the term of this JP 07'273773 10/1995 patent is extended or adjusted under 35 (Continued) U.S.C. 154 (b ) b y 127 d ays . OTHER PUBLICATIONS This patent is subject to a terminal dis- U.S. Appl. No. 09/591,510, ?led Jun. 12, 2000, Gelinas et a1. claimer. (Continued). (21) APP1- NOJ 11/277,293 Primary ExamineriGregory B Sefcheck _ (74) Attorney, Agent, or FirmiSterne, Kessler, Goldstein &

USFlled: 2006/0159104 Mar.Prior 23, A1 Publication J 1.20 Data2006 FOX

u ’ In a data-packet processor, a con?gurable queuing system for Related US Application Data packet accounting during processing has a plurality of queues _ _ _ _ arranged in one or more clusters, an identi?cation mechanism (63) Commuanon of aPPhCatlOn NO- 09/ 737,375, ?led on for creating a packet identi?er for arriving packets, insertion Dec- 14, 2000, HOW Pat- N0~ 7,058,064 logic for inserting packet identi?ers into queues and for deter (60) Provisional application No. 60/181,364, ?led on Feb. mining into which queue to insert a packet identi?er’ and 8 2000 selection logic for selecting packet identi?ers from queues to ’ initiate processing of identi?ed packets, doWnloading of (51) Int_ CL completed packets, or for requeuing of the selected packet H04L 12/56 (2006.01) identi?ers G06F 13/00 (2006.01) G06F 12/00 (2006.01) 21 Claims, 53 Drawing Sheets

Network/Switching Fabric Interface

f 209 Paging Local Packet Memory A Memory Management 8 (LPM) Unit ‘a ‘J PMMU “\w ‘E a 211\ 1, ~.\_ Queueing g . System 0 (Q5) U 107 \ I System Interface Unit (SIU) |-4 9-) I To system 105 " SRAM CAM Stream Processing Uni (SPU) 229 227 US 7,715,410 B2 Page 2

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