1 /* 2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved. 3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/spinlock.h> 35 #include <rdma/ib_smi.h> 36 37 #include "qib.h" 38 #include "qib_mad.h" 39 40 /* 41 * Switch to alternate path. 42 * The QP s_lock should be held and interrupts disabled. 43 */ 44 void qib_migrate_qp(struct rvt_qp *qp) 45 { 46 struct ib_event ev; 47 48 qp->s_mig_state = IB_MIG_MIGRATED; 49 qp->remote_ah_attr = qp->alt_ah_attr; 50 qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr); 51 qp->s_pkey_index = qp->s_alt_pkey_index; 52 53 ev.device = qp->ibqp.device; 54 ev.element.qp = &qp->ibqp; 55 ev.event = IB_EVENT_PATH_MIG; 56 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); 57 } 58 59 static __be64 get_sguid(struct qib_ibport *ibp, unsigned index) 60 { 61 if (!index) { 62 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 63 64 return ppd->guid; 65 } 66 return ibp->guids[index - 1]; 67 } 68 69 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) 70 { 71 return (gid->global.interface_id == id && 72 (gid->global.subnet_prefix == gid_prefix || 73 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); 74 } 75 76 /* 77 * 78 * This should be called with the QP r_lock held. 79 * 80 * The s_lock will be acquired around the qib_migrate_qp() call. 81 */ 82 int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr, 83 int has_grh, struct rvt_qp *qp, u32 bth0) 84 { 85 __be64 guid; 86 unsigned long flags; 87 88 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { 89 if (!has_grh) { 90 if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) & 91 IB_AH_GRH) 92 goto err; 93 } else { 94 const struct ib_global_route *grh; 95 96 if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) & 97 IB_AH_GRH)) 98 goto err; 99 grh = rdma_ah_read_grh(&qp->alt_ah_attr); 100 guid = get_sguid(ibp, grh->sgid_index); 101 if (!gid_ok(&hdr->u.l.grh.dgid, 102 ibp->rvp.gid_prefix, guid)) 103 goto err; 104 if (!gid_ok(&hdr->u.l.grh.sgid, 105 grh->dgid.global.subnet_prefix, 106 grh->dgid.global.interface_id)) 107 goto err; 108 } 109 if (!qib_pkey_ok((u16)bth0, 110 qib_get_pkey(ibp, qp->s_alt_pkey_index))) { 111 qib_bad_pkey(ibp, 112 (u16)bth0, 113 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 114 0, qp->ibqp.qp_num, 115 hdr->lrh[3], hdr->lrh[1]); 116 goto err; 117 } 118 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ 119 if ((be16_to_cpu(hdr->lrh[3]) != 120 rdma_ah_get_dlid(&qp->alt_ah_attr)) || 121 ppd_from_ibp(ibp)->port != 122 rdma_ah_get_port_num(&qp->alt_ah_attr)) 123 goto err; 124 spin_lock_irqsave(&qp->s_lock, flags); 125 qib_migrate_qp(qp); 126 spin_unlock_irqrestore(&qp->s_lock, flags); 127 } else { 128 if (!has_grh) { 129 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & 130 IB_AH_GRH) 131 goto err; 132 } else { 133 const struct ib_global_route *grh; 134 135 if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & 136 IB_AH_GRH)) 137 goto err; 138 grh = rdma_ah_read_grh(&qp->remote_ah_attr); 139 guid = get_sguid(ibp, grh->sgid_index); 140 if (!gid_ok(&hdr->u.l.grh.dgid, 141 ibp->rvp.gid_prefix, guid)) 142 goto err; 143 if (!gid_ok(&hdr->u.l.grh.sgid, 144 grh->dgid.global.subnet_prefix, 145 grh->dgid.global.interface_id)) 146 goto err; 147 } 148 if (!qib_pkey_ok((u16)bth0, 149 qib_get_pkey(ibp, qp->s_pkey_index))) { 150 qib_bad_pkey(ibp, 151 (u16)bth0, 152 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 153 0, qp->ibqp.qp_num, 154 hdr->lrh[3], hdr->lrh[1]); 155 goto err; 156 } 157 /* Validate the SLID. See Ch. 9.6.1.5 */ 158 if (be16_to_cpu(hdr->lrh[3]) != 159 rdma_ah_get_dlid(&qp->remote_ah_attr) || 160 ppd_from_ibp(ibp)->port != qp->port_num) 161 goto err; 162 if (qp->s_mig_state == IB_MIG_REARM && 163 !(bth0 & IB_BTH_MIG_REQ)) 164 qp->s_mig_state = IB_MIG_ARMED; 165 } 166 167 return 0; 168 169 err: 170 return 1; 171 } 172 173 /** 174 * qib_make_grh - construct a GRH header 175 * @ibp: a pointer to the IB port 176 * @hdr: a pointer to the GRH header being constructed 177 * @grh: the global route address to send to 178 * @hwords: the number of 32 bit words of header being sent 179 * @nwords: the number of 32 bit words of data being sent 180 * 181 * Return the size of the header in 32 bit words. 182 */ 183 u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr, 184 const struct ib_global_route *grh, u32 hwords, u32 nwords) 185 { 186 hdr->version_tclass_flow = 187 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | 188 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | 189 (grh->flow_label << IB_GRH_FLOW_SHIFT)); 190 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); 191 /* next_hdr is defined by C8-7 in ch. 8.4.1 */ 192 hdr->next_hdr = IB_GRH_NEXT_HDR; 193 hdr->hop_limit = grh->hop_limit; 194 /* The SGID is 32-bit aligned. */ 195 hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix; 196 if (!grh->sgid_index) 197 hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid; 198 else if (grh->sgid_index < QIB_GUIDS_PER_PORT) 199 hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1]; 200 hdr->dgid = grh->dgid; 201 202 /* GRH header size in 32-bit words. */ 203 return sizeof(struct ib_grh) / sizeof(u32); 204 } 205 206 void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, 207 u32 bth0, u32 bth2) 208 { 209 struct qib_qp_priv *priv = qp->priv; 210 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 211 u16 lrh0; 212 u32 nwords; 213 u32 extra_bytes; 214 215 /* Construct the header. */ 216 extra_bytes = -qp->s_cur_size & 3; 217 nwords = (qp->s_cur_size + extra_bytes) >> 2; 218 lrh0 = QIB_LRH_BTH; 219 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { 220 qp->s_hdrwords += 221 qib_make_grh(ibp, &priv->s_hdr->u.l.grh, 222 rdma_ah_read_grh(&qp->remote_ah_attr), 223 qp->s_hdrwords, nwords); 224 lrh0 = QIB_LRH_GRH; 225 } 226 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 | 227 rdma_ah_get_sl(&qp->remote_ah_attr) << 4; 228 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); 229 priv->s_hdr->lrh[1] = 230 cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr)); 231 priv->s_hdr->lrh[2] = 232 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 233 priv->s_hdr->lrh[3] = 234 cpu_to_be16(ppd_from_ibp(ibp)->lid | 235 rdma_ah_get_path_bits(&qp->remote_ah_attr)); 236 bth0 |= qib_get_pkey(ibp, qp->s_pkey_index); 237 bth0 |= extra_bytes << 20; 238 if (qp->s_mig_state == IB_MIG_MIGRATED) 239 bth0 |= IB_BTH_MIG_REQ; 240 ohdr->bth[0] = cpu_to_be32(bth0); 241 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); 242 ohdr->bth[2] = cpu_to_be32(bth2); 243 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 244 } 245 246 void _qib_do_send(struct work_struct *work) 247 { 248 struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv, 249 s_work); 250 struct rvt_qp *qp = priv->owner; 251 252 qib_do_send(qp); 253 } 254 255 /** 256 * qib_do_send - perform a send on a QP 257 * @qp: pointer to the QP 258 * 259 * Process entries in the send work queue until credit or queue is 260 * exhausted. Only allow one CPU to send a packet per QP (tasklet). 261 * Otherwise, two threads could send packets out of order. 262 */ 263 void qib_do_send(struct rvt_qp *qp) 264 { 265 struct qib_qp_priv *priv = qp->priv; 266 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 267 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 268 int (*make_req)(struct rvt_qp *qp, unsigned long *flags); 269 unsigned long flags; 270 271 if ((qp->ibqp.qp_type == IB_QPT_RC || 272 qp->ibqp.qp_type == IB_QPT_UC) && 273 (rdma_ah_get_dlid(&qp->remote_ah_attr) & 274 ~((1 << ppd->lmc) - 1)) == ppd->lid) { 275 rvt_ruc_loopback(qp); 276 return; 277 } 278 279 if (qp->ibqp.qp_type == IB_QPT_RC) 280 make_req = qib_make_rc_req; 281 else if (qp->ibqp.qp_type == IB_QPT_UC) 282 make_req = qib_make_uc_req; 283 else 284 make_req = qib_make_ud_req; 285 286 spin_lock_irqsave(&qp->s_lock, flags); 287 288 /* Return if we are already busy processing a work request. */ 289 if (!qib_send_ok(qp)) { 290 spin_unlock_irqrestore(&qp->s_lock, flags); 291 return; 292 } 293 294 qp->s_flags |= RVT_S_BUSY; 295 296 do { 297 /* Check for a constructed packet to be sent. */ 298 if (qp->s_hdrwords != 0) { 299 spin_unlock_irqrestore(&qp->s_lock, flags); 300 /* 301 * If the packet cannot be sent now, return and 302 * the send tasklet will be woken up later. 303 */ 304 if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords, 305 qp->s_cur_sge, qp->s_cur_size)) 306 return; 307 /* Record that s_hdr is empty. */ 308 qp->s_hdrwords = 0; 309 spin_lock_irqsave(&qp->s_lock, flags); 310 } 311 } while (make_req(qp, &flags)); 312 313 spin_unlock_irqrestore(&qp->s_lock, flags); 314 } 315