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27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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34 * lnet/klnds/qswlnd/qswlnd.h
36 * Basic library routines.
42 #include <qsnet/kernel.h>
43 #undef printf /* nasty QSW #define */
44 #include <linux/module.h>
46 #include <elan/epcomms.h>
48 #include <linux/kernel.h>
50 #include <linux/string.h>
51 #include <linux/stat.h>
52 #include <linux/errno.h>
53 #include <linux/buffer_head.h> /* wait_on_buffer */
54 #include <linux/unistd.h>
56 #include <linux/uio.h>
58 #include <asm/system.h>
59 #include <asm/uaccess.h>
62 #include <linux/file.h>
63 #include <linux/stat.h>
64 #include <linux/list.h>
65 #include <linux/sysctl.h>
67 #define DEBUG_SUBSYSTEM S_LND
69 #include <libcfs/libcfs.h>
70 #include <lnet/lnet.h>
71 #include <lnet/lib-lnet.h>
72 #include <lnet/lnet-sysctl.h>
75 #define KQSW_SMALLMSG (4<<10) /* small/large ep receiver breakpoint */
76 #define KQSW_RESCHED 100 /* # busy loops that forces scheduler to yield */
78 #define KQSW_CKSUM 0 /* enable checksumming (protocol incompatible) */
84 #define KQSW_TX_BUFFER_SIZE (offsetof(kqswnal_msg_t, \
85 kqm_u.immediate.kqim_payload[*kqswnal_tunables.kqn_tx_maxcontig]))
86 /* The pre-allocated tx buffer (hdr + small payload) */
88 #define KQSW_NTXMSGPAGES (btopr(KQSW_TX_BUFFER_SIZE) + 1 + btopr(LNET_MAX_PAYLOAD) + 1)
89 /* Reserve elan address space for pre-allocated and pre-mapped transmit
90 * buffer and a full payload too. Extra pages allow for page alignment */
92 #define KQSW_NRXMSGPAGES_SMALL (btopr(KQSW_SMALLMSG))
93 /* receive hdr/payload always contiguous and page aligned */
94 #define KQSW_NRXMSGBYTES_SMALL (KQSW_NRXMSGPAGES_SMALL * PAGE_SIZE)
96 #define KQSW_NRXMSGPAGES_LARGE (btopr(sizeof(lnet_msg_t) + LNET_MAX_PAYLOAD))
97 /* receive hdr/payload always contiguous and page aligned */
98 #define KQSW_NRXMSGBYTES_LARGE (KQSW_NRXMSGPAGES_LARGE * PAGE_SIZE)
99 /* biggest complete packet we can receive (or transmit) */
102 /* Remote memory descriptor */
105 __u32 kqrmd_nfrag; /* # frags */
106 EP_NMD kqrmd_frag[0]; /* actual frags */
107 } kqswnal_remotemd_t;
112 lnet_hdr_t kqim_hdr; /* LNET header */
113 char kqim_payload[0]; /* piggy-backed payload */
114 } WIRE_ATTR kqswnal_immediate_msg_t;
119 lnet_hdr_t kqrm_hdr; /* LNET header */
120 kqswnal_remotemd_t kqrm_rmd; /* peer's buffer */
121 } WIRE_ATTR kqswnal_rdma_msg_t;
125 __u32 kqm_magic; /* I'm a qswlnd message */
126 __u16 kqm_version; /* this is my version number */
127 __u16 kqm_type; /* msg type */
129 __u32 kqm_cksum; /* crc32 checksum */
130 __u32 kqm_nob; /* original msg length */
133 kqswnal_immediate_msg_t immediate;
134 kqswnal_rdma_msg_t rdma;
136 } WIRE_ATTR kqswnal_msg_t;
138 #if KQSW_CKSUM /* enable checksums ? */
139 # include <linux/crc32.h>
140 static inline __u32 kqswnal_csum(__u32 crc, unsigned char const *p, size_t len)
143 return crc32_le(crc, p, len);
146 crc = ((crc + 0x100) & ~0xff) | ((crc + *p++) & 0xff) ;
150 # define QSWLND_PROTO_VERSION 0xbeef
152 # define QSWLND_PROTO_VERSION 1
155 #define QSWLND_MSG_IMMEDIATE 0
156 #define QSWLND_MSG_RDMA 1
159 EP_STATUSBLK ep_statusblk;
171 } kqswnal_rpc_reply_t;
173 typedef struct kqswnal_rx
175 cfs_list_t krx_list; /* enqueue -> thread */
176 struct kqswnal_rx *krx_alloclist;/* stack in kqn_rxds */
177 EP_RCVR *krx_eprx; /* port to post receives to */
178 EP_RXD *krx_rxd; /* receive descriptor (for repost) */
179 EP_NMD krx_elanbuffer;/* contiguous Elan buffer */
180 int krx_npages; /* # pages in receive buffer */
181 int krx_nob; /* Number Of Bytes received into buffer */
182 int krx_rpc_reply_needed:1; /* peer waiting for EKC RPC reply */
183 int krx_state; /* what this RX is doing */
184 cfs_atomic_t krx_refcount; /* how to tell when rpc is done */
186 __u32 krx_cksum; /* checksum */
188 kqswnal_rpc_reply_t krx_rpc_reply; /* rpc reply status block */
189 lnet_kiov_t krx_kiov[KQSW_NRXMSGPAGES_LARGE];/* buffer frags */
192 #define KRX_POSTED 1 /* receiving */
193 #define KRX_PARSE 2 /* ready to be parsed */
194 #define KRX_COMPLETING 3 /* waiting to be completed */
197 typedef struct kqswnal_tx
199 cfs_list_t ktx_list; /* enqueue idle/active */
200 cfs_list_t ktx_schedlist; /* enqueue on scheduler */
201 struct kqswnal_tx *ktx_alloclist; /* stack in kqn_txds */
202 unsigned int ktx_state:7; /* What I'm doing */
203 unsigned int ktx_firsttmpfrag:1; /* ktx_frags[0] is in my ebuffer ? 0 : 1 */
204 __u32 ktx_basepage; /* page offset in reserved elan tx vaddrs for mapping pages */
205 int ktx_npages; /* pages reserved for mapping messages */
206 int ktx_nmappedpages; /* # pages mapped for current message */
207 int ktx_port; /* destination ep port */
208 lnet_nid_t ktx_nid; /* destination node */
209 void *ktx_args[3]; /* completion passthru */
210 char *ktx_buffer; /* pre-allocated contiguous buffer for hdr + small payloads */
211 cfs_time_t ktx_launchtime; /* when (in jiffies) the
212 * transmit was launched */
213 int ktx_status; /* completion status */
215 __u32 ktx_cksum; /* optimized GET payload checksum */
217 /* debug/info fields */
218 pid_t ktx_launcher; /* pid of launching process */
220 int ktx_nfrag; /* # message frags */
221 int ktx_rail; /* preferred rail */
222 EP_NMD ktx_ebuffer; /* elan mapping of ktx_buffer */
223 EP_NMD ktx_frags[EP_MAXFRAG];/* elan mapping of msg frags */
226 #define KTX_IDLE 0 /* on kqn_idletxds */
227 #define KTX_SENDING 1 /* normal send */
228 #define KTX_GETTING 2 /* sending optimised get */
229 #define KTX_PUTTING 3 /* sending optimised put */
230 #define KTX_RDMA_FETCH 4 /* handling optimised put */
231 #define KTX_RDMA_STORE 5 /* handling optimised get */
235 int *kqn_tx_maxcontig; /* maximum payload to defrag */
236 int *kqn_ntxmsgs; /* # normal tx msgs */
237 int *kqn_credits; /* # concurrent sends */
238 int *kqn_peercredits; /* # concurrent sends to 1 peer */
239 int *kqn_nrxmsgs_large; /* # 'large' rx msgs */
240 int *kqn_ep_envelopes_large; /* # 'large' rx ep envelopes */
241 int *kqn_nrxmsgs_small; /* # 'small' rx msgs */
242 int *kqn_ep_envelopes_small; /* # 'small' rx ep envelopes */
243 int *kqn_optimized_puts; /* optimized PUTs? */
244 int *kqn_optimized_gets; /* optimized GETs? */
246 int *kqn_inject_csum_error; /* # csum errors to inject */
249 #if defined(CONFIG_SYSCTL) && !CFS_SYSFS_MODULE_PARM
250 cfs_sysctl_table_header_t *kqn_sysctl; /* sysctl interface */
252 } kqswnal_tunables_t;
256 char kqn_init; /* what's been initialised */
257 char kqn_shuttingdown;/* I'm trying to shut down */
258 cfs_atomic_t kqn_nthreads; /* # threads running */
259 lnet_ni_t *kqn_ni; /* _the_ instance of me */
261 kqswnal_rx_t *kqn_rxds; /* stack of all the receive descriptors */
262 kqswnal_tx_t *kqn_txds; /* stack of all the transmit descriptors */
264 cfs_list_t kqn_idletxds; /* transmit descriptors free to use */
265 cfs_list_t kqn_activetxds; /* transmit descriptors being used */
266 cfs_spinlock_t kqn_idletxd_lock; /* serialise idle txd access */
267 cfs_atomic_t kqn_pending_txs;/* # transmits being prepped */
269 cfs_spinlock_t kqn_sched_lock; /* serialise packet schedulers */
270 cfs_waitq_t kqn_sched_waitq;/* scheduler blocks here */
272 cfs_list_t kqn_readyrxds; /* rxds full of data */
273 cfs_list_t kqn_donetxds; /* completed transmits */
274 cfs_list_t kqn_delayedtxds;/* delayed transmits */
276 EP_SYS *kqn_ep; /* elan system */
277 EP_NMH *kqn_ep_tx_nmh; /* elan reserved tx vaddrs */
278 EP_NMH *kqn_ep_rx_nmh; /* elan reserved rx vaddrs */
279 EP_XMTR *kqn_eptx; /* elan transmitter */
280 EP_RCVR *kqn_eprx_small; /* elan receiver (small messages) */
281 EP_RCVR *kqn_eprx_large; /* elan receiver (large messages) */
283 int kqn_nnodes; /* this cluster's size */
284 int kqn_elanid; /* this nodes's elan ID */
286 EP_STATUSBLK kqn_rpc_success;/* preset RPC reply status blocks */
287 EP_STATUSBLK kqn_rpc_failed;
288 EP_STATUSBLK kqn_rpc_version;/* reply to future version query */
289 EP_STATUSBLK kqn_rpc_magic; /* reply to future version query */
293 #define KQN_INIT_NOTHING 0 /* MUST BE ZERO so zeroed state is initialised OK */
294 #define KQN_INIT_DATA 1
295 #define KQN_INIT_ALL 2
297 extern kqswnal_tunables_t kqswnal_tunables;
298 extern kqswnal_data_t kqswnal_data;
300 extern int kqswnal_thread_start (int (*fn)(void *arg), void *arg);
301 extern void kqswnal_rxhandler(EP_RXD *rxd);
302 extern int kqswnal_scheduler (void *);
303 extern void kqswnal_rx_done (kqswnal_rx_t *krx);
305 static inline lnet_nid_t
306 kqswnal_elanid2nid (int elanid)
308 return LNET_MKNID(LNET_NIDNET(kqswnal_data.kqn_ni->ni_nid), elanid);
312 kqswnal_nid2elanid (lnet_nid_t nid)
314 __u32 elanid = LNET_NIDADDR(nid);
316 /* not in this cluster? */
317 return (elanid >= kqswnal_data.kqn_nnodes) ? -1 : elanid;
320 static inline lnet_nid_t
321 kqswnal_rx_nid(kqswnal_rx_t *krx)
323 return (kqswnal_elanid2nid(ep_rxd_node(krx->krx_rxd)));
327 kqswnal_pages_spanned (void *base, int nob)
329 unsigned long first_page = ((unsigned long)base) >> PAGE_SHIFT;
330 unsigned long last_page = (((unsigned long)base) + (nob - 1)) >> PAGE_SHIFT;
332 LASSERT (last_page >= first_page); /* can't wrap address space */
333 return (last_page - first_page + 1);
336 static inline void kqswnal_rx_decref (kqswnal_rx_t *krx)
338 LASSERT (cfs_atomic_read (&krx->krx_refcount) > 0);
339 if (cfs_atomic_dec_and_test (&krx->krx_refcount))
340 kqswnal_rx_done(krx);
343 int kqswnal_startup (lnet_ni_t *ni);
344 void kqswnal_shutdown (lnet_ni_t *ni);
345 int kqswnal_ctl (lnet_ni_t *ni, unsigned int cmd, void *arg);
346 int kqswnal_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg);
347 int kqswnal_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg,
348 int delayed, unsigned int niov,
349 struct iovec *iov, lnet_kiov_t *kiov,
350 unsigned int offset, unsigned int mlen, unsigned int rlen);
352 int kqswnal_tunables_init(void);
353 void kqswnal_tunables_fini(void);
355 #endif /* _QSWNAL_H */