Merge git://git.infradead.org/battery-2.6
[linux-2.6] / drivers / infiniband / hw / cxgb3 / iwch_cq.c
1 /*
2  * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 #include "iwch_provider.h"
33 #include "iwch.h"
34
35 /*
36  * Get one cq entry from cxio and map it to openib.
37  *
38  * Returns:
39  *      0                       EMPTY;
40  *      1                       cqe returned
41  *      -EAGAIN         caller must try again
42  *      any other -errno        fatal error
43  */
44 static int iwch_poll_cq_one(struct iwch_dev *rhp, struct iwch_cq *chp,
45                             struct ib_wc *wc)
46 {
47         struct iwch_qp *qhp = NULL;
48         struct t3_cqe cqe, *rd_cqe;
49         struct t3_wq *wq;
50         u32 credit = 0;
51         u8 cqe_flushed;
52         u64 cookie;
53         int ret = 1;
54
55         rd_cqe = cxio_next_cqe(&chp->cq);
56
57         if (!rd_cqe)
58                 return 0;
59
60         qhp = get_qhp(rhp, CQE_QPID(*rd_cqe));
61         if (!qhp)
62                 wq = NULL;
63         else {
64                 spin_lock(&qhp->lock);
65                 wq = &(qhp->wq);
66         }
67         ret = cxio_poll_cq(wq, &(chp->cq), &cqe, &cqe_flushed, &cookie,
68                                    &credit);
69         if (t3a_device(chp->rhp) && credit) {
70                 PDBG("%s updating %d cq credits on id %d\n", __func__,
71                      credit, chp->cq.cqid);
72                 cxio_hal_cq_op(&rhp->rdev, &chp->cq, CQ_CREDIT_UPDATE, credit);
73         }
74
75         if (ret) {
76                 ret = -EAGAIN;
77                 goto out;
78         }
79         ret = 1;
80
81         wc->wr_id = cookie;
82         wc->qp = &qhp->ibqp;
83         wc->vendor_err = CQE_STATUS(cqe);
84
85         PDBG("%s qpid 0x%x type %d opcode %d status 0x%x wrid hi 0x%x "
86              "lo 0x%x cookie 0x%llx\n", __func__,
87              CQE_QPID(cqe), CQE_TYPE(cqe),
88              CQE_OPCODE(cqe), CQE_STATUS(cqe), CQE_WRID_HI(cqe),
89              CQE_WRID_LOW(cqe), (unsigned long long) cookie);
90
91         if (CQE_TYPE(cqe) == 0) {
92                 if (!CQE_STATUS(cqe))
93                         wc->byte_len = CQE_LEN(cqe);
94                 else
95                         wc->byte_len = 0;
96                 wc->opcode = IB_WC_RECV;
97         } else {
98                 switch (CQE_OPCODE(cqe)) {
99                 case T3_RDMA_WRITE:
100                         wc->opcode = IB_WC_RDMA_WRITE;
101                         break;
102                 case T3_READ_REQ:
103                         wc->opcode = IB_WC_RDMA_READ;
104                         wc->byte_len = CQE_LEN(cqe);
105                         break;
106                 case T3_SEND:
107                 case T3_SEND_WITH_SE:
108                         wc->opcode = IB_WC_SEND;
109                         break;
110                 case T3_BIND_MW:
111                         wc->opcode = IB_WC_BIND_MW;
112                         break;
113
114                 /* these aren't supported yet */
115                 case T3_SEND_WITH_INV:
116                 case T3_SEND_WITH_SE_INV:
117                 case T3_LOCAL_INV:
118                 case T3_FAST_REGISTER:
119                 default:
120                         printk(KERN_ERR MOD "Unexpected opcode %d "
121                                "in the CQE received for QPID=0x%0x\n",
122                                CQE_OPCODE(cqe), CQE_QPID(cqe));
123                         ret = -EINVAL;
124                         goto out;
125                 }
126         }
127
128         if (cqe_flushed)
129                 wc->status = IB_WC_WR_FLUSH_ERR;
130         else {
131
132                 switch (CQE_STATUS(cqe)) {
133                 case TPT_ERR_SUCCESS:
134                         wc->status = IB_WC_SUCCESS;
135                         break;
136                 case TPT_ERR_STAG:
137                         wc->status = IB_WC_LOC_ACCESS_ERR;
138                         break;
139                 case TPT_ERR_PDID:
140                         wc->status = IB_WC_LOC_PROT_ERR;
141                         break;
142                 case TPT_ERR_QPID:
143                 case TPT_ERR_ACCESS:
144                         wc->status = IB_WC_LOC_ACCESS_ERR;
145                         break;
146                 case TPT_ERR_WRAP:
147                         wc->status = IB_WC_GENERAL_ERR;
148                         break;
149                 case TPT_ERR_BOUND:
150                         wc->status = IB_WC_LOC_LEN_ERR;
151                         break;
152                 case TPT_ERR_INVALIDATE_SHARED_MR:
153                 case TPT_ERR_INVALIDATE_MR_WITH_MW_BOUND:
154                         wc->status = IB_WC_MW_BIND_ERR;
155                         break;
156                 case TPT_ERR_CRC:
157                 case TPT_ERR_MARKER:
158                 case TPT_ERR_PDU_LEN_ERR:
159                 case TPT_ERR_OUT_OF_RQE:
160                 case TPT_ERR_DDP_VERSION:
161                 case TPT_ERR_RDMA_VERSION:
162                 case TPT_ERR_DDP_QUEUE_NUM:
163                 case TPT_ERR_MSN:
164                 case TPT_ERR_TBIT:
165                 case TPT_ERR_MO:
166                 case TPT_ERR_MSN_RANGE:
167                 case TPT_ERR_IRD_OVERFLOW:
168                 case TPT_ERR_OPCODE:
169                         wc->status = IB_WC_FATAL_ERR;
170                         break;
171                 case TPT_ERR_SWFLUSH:
172                         wc->status = IB_WC_WR_FLUSH_ERR;
173                         break;
174                 default:
175                         printk(KERN_ERR MOD "Unexpected cqe_status 0x%x for "
176                                "QPID=0x%0x\n", CQE_STATUS(cqe), CQE_QPID(cqe));
177                         ret = -EINVAL;
178                 }
179         }
180 out:
181         if (wq)
182                 spin_unlock(&qhp->lock);
183         return ret;
184 }
185
186 int iwch_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
187 {
188         struct iwch_dev *rhp;
189         struct iwch_cq *chp;
190         unsigned long flags;
191         int npolled;
192         int err = 0;
193
194         chp = to_iwch_cq(ibcq);
195         rhp = chp->rhp;
196
197         spin_lock_irqsave(&chp->lock, flags);
198         for (npolled = 0; npolled < num_entries; ++npolled) {
199 #ifdef DEBUG
200                 int i=0;
201 #endif
202
203                 /*
204                  * Because T3 can post CQEs that are _not_ associated
205                  * with a WR, we might have to poll again after removing
206                  * one of these.
207                  */
208                 do {
209                         err = iwch_poll_cq_one(rhp, chp, wc + npolled);
210 #ifdef DEBUG
211                         BUG_ON(++i > 1000);
212 #endif
213                 } while (err == -EAGAIN);
214                 if (err <= 0)
215                         break;
216         }
217         spin_unlock_irqrestore(&chp->lock, flags);
218
219         if (err < 0)
220                 return err;
221         else {
222                 return npolled;
223         }
224 }