From patchwork Fri May 7 00:02:22 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ralph Campbell X-Patchwork-Id: 97544 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o470UFmq016682 for ; Fri, 7 May 2010 00:31:32 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752809Ab0EGACX (ORCPT ); Thu, 6 May 2010 20:02:23 -0400 Received: from vpn.pathscale.com ([198.186.3.75]:51952 "HELO mx.mv.qlogic.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with SMTP id S1752785Ab0EGACW (ORCPT ); Thu, 6 May 2010 20:02:22 -0400 Received: from chromite.mv.qlogic.com (chromite.mv.qlogic.com [10.29.2.82]) by mx.mv.qlogic.com (Postfix) with ESMTP id 1F1FB949C01A; Thu, 6 May 2010 17:02:22 -0700 (PDT) Received: from chromite.mv.qlogic.com (localhost.localdomain [127.0.0.1]) by chromite.mv.qlogic.com (Postfix) with ESMTP id 198B0142961; Thu, 6 May 2010 17:02:22 -0700 (PDT) From: Ralph Campbell Subject: [PATCH v3 40/52] IB/qib: Add qib_uc.c To: Roland Dreier Cc: linux-rdma@vger.kernel.org Date: Thu, 06 May 2010 17:02:22 -0700 Message-ID: <20100507000221.3441.98195.stgit@chromite.mv.qlogic.com> In-Reply-To: <20100506235849.3441.85930.stgit@chromite.mv.qlogic.com> References: <20100506235849.3441.85930.stgit@chromite.mv.qlogic.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Fri, 07 May 2010 00:31:33 +0000 (UTC) diff --git a/drivers/infiniband/hw/qib/qib_uc.c b/drivers/infiniband/hw/qib/qib_uc.c new file mode 100644 index 0000000..6c7fe78 --- /dev/null +++ b/drivers/infiniband/hw/qib/qib_uc.c @@ -0,0 +1,555 @@ +/* + * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation. + * All rights reserved. + * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include "qib.h" + +/* cut down ridiculously long IB macro names */ +#define OP(x) IB_OPCODE_UC_##x + +/** + * qib_make_uc_req - construct a request packet (SEND, RDMA write) + * @qp: a pointer to the QP + * + * Return 1 if constructed; otherwise, return 0. + */ +int qib_make_uc_req(struct qib_qp *qp) +{ + struct qib_other_headers *ohdr; + struct qib_swqe *wqe; + unsigned long flags; + u32 hwords; + u32 bth0; + u32 len; + u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); + int ret = 0; + + spin_lock_irqsave(&qp->s_lock, flags); + + if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_SEND_OK)) { + if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND)) + goto bail; + /* We are in the error state, flush the work request. */ + if (qp->s_last == qp->s_head) + goto bail; + /* If DMAs are in progress, we can't flush immediately. */ + if (atomic_read(&qp->s_dma_busy)) { + qp->s_flags |= QIB_S_WAIT_DMA; + goto bail; + } + wqe = get_swqe_ptr(qp, qp->s_last); + qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); + goto done; + } + + ohdr = &qp->s_hdr.u.oth; + if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) + ohdr = &qp->s_hdr.u.l.oth; + + /* header size in 32-bit words LRH+BTH = (8+12)/4. */ + hwords = 5; + bth0 = 0; + + /* Get the next send request. */ + wqe = get_swqe_ptr(qp, qp->s_cur); + qp->s_wqe = NULL; + switch (qp->s_state) { + default: + if (!(ib_qib_state_ops[qp->state] & + QIB_PROCESS_NEXT_SEND_OK)) + goto bail; + /* Check if send work queue is empty. */ + if (qp->s_cur == qp->s_head) + goto bail; + /* + * Start a new request. + */ + wqe->psn = qp->s_next_psn; + qp->s_psn = qp->s_next_psn; + qp->s_sge.sge = wqe->sg_list[0]; + qp->s_sge.sg_list = wqe->sg_list + 1; + qp->s_sge.num_sge = wqe->wr.num_sge; + qp->s_sge.total_len = wqe->length; + len = wqe->length; + qp->s_len = len; + switch (wqe->wr.opcode) { + case IB_WR_SEND: + case IB_WR_SEND_WITH_IMM: + if (len > pmtu) { + qp->s_state = OP(SEND_FIRST); + len = pmtu; + break; + } + if (wqe->wr.opcode == IB_WR_SEND) + qp->s_state = OP(SEND_ONLY); + else { + qp->s_state = + OP(SEND_ONLY_WITH_IMMEDIATE); + /* Immediate data comes after the BTH */ + ohdr->u.imm_data = wqe->wr.ex.imm_data; + hwords += 1; + } + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + qp->s_wqe = wqe; + if (++qp->s_cur >= qp->s_size) + qp->s_cur = 0; + break; + + case IB_WR_RDMA_WRITE: + case IB_WR_RDMA_WRITE_WITH_IMM: + ohdr->u.rc.reth.vaddr = + cpu_to_be64(wqe->wr.wr.rdma.remote_addr); + ohdr->u.rc.reth.rkey = + cpu_to_be32(wqe->wr.wr.rdma.rkey); + ohdr->u.rc.reth.length = cpu_to_be32(len); + hwords += sizeof(struct ib_reth) / 4; + if (len > pmtu) { + qp->s_state = OP(RDMA_WRITE_FIRST); + len = pmtu; + break; + } + if (wqe->wr.opcode == IB_WR_RDMA_WRITE) + qp->s_state = OP(RDMA_WRITE_ONLY); + else { + qp->s_state = + OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); + /* Immediate data comes after the RETH */ + ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; + hwords += 1; + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + } + qp->s_wqe = wqe; + if (++qp->s_cur >= qp->s_size) + qp->s_cur = 0; + break; + + default: + goto bail; + } + break; + + case OP(SEND_FIRST): + qp->s_state = OP(SEND_MIDDLE); + /* FALLTHROUGH */ + case OP(SEND_MIDDLE): + len = qp->s_len; + if (len > pmtu) { + len = pmtu; + break; + } + if (wqe->wr.opcode == IB_WR_SEND) + qp->s_state = OP(SEND_LAST); + else { + qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); + /* Immediate data comes after the BTH */ + ohdr->u.imm_data = wqe->wr.ex.imm_data; + hwords += 1; + } + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + qp->s_wqe = wqe; + if (++qp->s_cur >= qp->s_size) + qp->s_cur = 0; + break; + + case OP(RDMA_WRITE_FIRST): + qp->s_state = OP(RDMA_WRITE_MIDDLE); + /* FALLTHROUGH */ + case OP(RDMA_WRITE_MIDDLE): + len = qp->s_len; + if (len > pmtu) { + len = pmtu; + break; + } + if (wqe->wr.opcode == IB_WR_RDMA_WRITE) + qp->s_state = OP(RDMA_WRITE_LAST); + else { + qp->s_state = + OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); + /* Immediate data comes after the BTH */ + ohdr->u.imm_data = wqe->wr.ex.imm_data; + hwords += 1; + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + } + qp->s_wqe = wqe; + if (++qp->s_cur >= qp->s_size) + qp->s_cur = 0; + break; + } + qp->s_len -= len; + qp->s_hdrwords = hwords; + qp->s_cur_sge = &qp->s_sge; + qp->s_cur_size = len; + qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), + qp->s_next_psn++ & QIB_PSN_MASK); +done: + ret = 1; + goto unlock; + +bail: + qp->s_flags &= ~QIB_S_BUSY; +unlock: + spin_unlock_irqrestore(&qp->s_lock, flags); + return ret; +} + +/** + * qib_uc_rcv - handle an incoming UC packet + * @ibp: the port the packet came in on + * @hdr: the header of the packet + * @has_grh: true if the packet has a GRH + * @data: the packet data + * @tlen: the length of the packet + * @qp: the QP for this packet. + * + * This is called from qib_qp_rcv() to process an incoming UC packet + * for the given QP. + * Called at interrupt level. + */ +void qib_uc_rcv(struct qib_ibport *ibp, struct qib_ib_header *hdr, + int has_grh, void *data, u32 tlen, struct qib_qp *qp) +{ + struct qib_other_headers *ohdr; + unsigned long flags; + u32 opcode; + u32 hdrsize; + u32 psn; + u32 pad; + struct ib_wc wc; + u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); + struct ib_reth *reth; + int ret; + + /* Check for GRH */ + if (!has_grh) { + ohdr = &hdr->u.oth; + hdrsize = 8 + 12; /* LRH + BTH */ + } else { + ohdr = &hdr->u.l.oth; + hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ + } + + opcode = be32_to_cpu(ohdr->bth[0]); + spin_lock_irqsave(&qp->s_lock, flags); + if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode)) + goto sunlock; + spin_unlock_irqrestore(&qp->s_lock, flags); + + psn = be32_to_cpu(ohdr->bth[2]); + opcode >>= 24; + memset(&wc, 0, sizeof wc); + + /* Prevent simultaneous processing after APM on different CPUs */ + spin_lock(&qp->r_lock); + + /* Compare the PSN verses the expected PSN. */ + if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) { + /* + * Handle a sequence error. + * Silently drop any current message. + */ + qp->r_psn = psn; +inv: + if (qp->r_state == OP(SEND_FIRST) || + qp->r_state == OP(SEND_MIDDLE)) { + set_bit(QIB_R_REWIND_SGE, &qp->r_aflags); + qp->r_sge.num_sge = 0; + } else + while (qp->r_sge.num_sge) { + atomic_dec(&qp->r_sge.sge.mr->refcount); + if (--qp->r_sge.num_sge) + qp->r_sge.sge = *qp->r_sge.sg_list++; + } + qp->r_state = OP(SEND_LAST); + switch (opcode) { + case OP(SEND_FIRST): + case OP(SEND_ONLY): + case OP(SEND_ONLY_WITH_IMMEDIATE): + goto send_first; + + case OP(RDMA_WRITE_FIRST): + case OP(RDMA_WRITE_ONLY): + case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): + goto rdma_first; + + default: + goto drop; + } + } + + /* Check for opcode sequence errors. */ + switch (qp->r_state) { + case OP(SEND_FIRST): + case OP(SEND_MIDDLE): + if (opcode == OP(SEND_MIDDLE) || + opcode == OP(SEND_LAST) || + opcode == OP(SEND_LAST_WITH_IMMEDIATE)) + break; + goto inv; + + case OP(RDMA_WRITE_FIRST): + case OP(RDMA_WRITE_MIDDLE): + if (opcode == OP(RDMA_WRITE_MIDDLE) || + opcode == OP(RDMA_WRITE_LAST) || + opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) + break; + goto inv; + + default: + if (opcode == OP(SEND_FIRST) || + opcode == OP(SEND_ONLY) || + opcode == OP(SEND_ONLY_WITH_IMMEDIATE) || + opcode == OP(RDMA_WRITE_FIRST) || + opcode == OP(RDMA_WRITE_ONLY) || + opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) + break; + goto inv; + } + + if (qp->state == IB_QPS_RTR && !(qp->r_flags & QIB_R_COMM_EST)) { + qp->r_flags |= QIB_R_COMM_EST; + if (qp->ibqp.event_handler) { + struct ib_event ev; + + ev.device = qp->ibqp.device; + ev.element.qp = &qp->ibqp; + ev.event = IB_EVENT_COMM_EST; + qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); + } + } + + /* OK, process the packet. */ + switch (opcode) { + case OP(SEND_FIRST): + case OP(SEND_ONLY): + case OP(SEND_ONLY_WITH_IMMEDIATE): +send_first: + if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags)) + qp->r_sge = qp->s_rdma_read_sge; + else { + ret = qib_get_rwqe(qp, 0); + if (ret < 0) + goto op_err; + if (!ret) + goto drop; + /* + * qp->s_rdma_read_sge will be the owner + * of the mr references. + */ + qp->s_rdma_read_sge = qp->r_sge; + } + qp->r_rcv_len = 0; + if (opcode == OP(SEND_ONLY)) + goto send_last; + else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE)) + goto send_last_imm; + /* FALLTHROUGH */ + case OP(SEND_MIDDLE): + /* Check for invalid length PMTU or posted rwqe len. */ + if (unlikely(tlen != (hdrsize + pmtu + 4))) + goto rewind; + qp->r_rcv_len += pmtu; + if (unlikely(qp->r_rcv_len > qp->r_len)) + goto rewind; + qib_copy_sge(&qp->r_sge, data, pmtu, 0); + break; + + case OP(SEND_LAST_WITH_IMMEDIATE): +send_last_imm: + wc.ex.imm_data = ohdr->u.imm_data; + hdrsize += 4; + wc.wc_flags = IB_WC_WITH_IMM; + /* FALLTHROUGH */ + case OP(SEND_LAST): +send_last: + /* Get the number of bytes the message was padded by. */ + pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; + /* Check for invalid length. */ + /* XXX LAST len should be >= 1 */ + if (unlikely(tlen < (hdrsize + pad + 4))) + goto rewind; + /* Don't count the CRC. */ + tlen -= (hdrsize + pad + 4); + wc.byte_len = tlen + qp->r_rcv_len; + if (unlikely(wc.byte_len > qp->r_len)) + goto rewind; + wc.opcode = IB_WC_RECV; +last_imm: + qib_copy_sge(&qp->r_sge, data, tlen, 0); + while (qp->s_rdma_read_sge.num_sge) { + atomic_dec(&qp->s_rdma_read_sge.sge.mr->refcount); + if (--qp->s_rdma_read_sge.num_sge) + qp->s_rdma_read_sge.sge = + *qp->s_rdma_read_sge.sg_list++; + } + wc.wr_id = qp->r_wr_id; + wc.status = IB_WC_SUCCESS; + wc.qp = &qp->ibqp; + wc.src_qp = qp->remote_qpn; + wc.slid = qp->remote_ah_attr.dlid; + wc.sl = qp->remote_ah_attr.sl; + /* Signal completion event if the solicited bit is set. */ + qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, + (ohdr->bth[0] & + cpu_to_be32(IB_BTH_SOLICITED)) != 0); + break; + + case OP(RDMA_WRITE_FIRST): + case OP(RDMA_WRITE_ONLY): + case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */ +rdma_first: + if (unlikely(!(qp->qp_access_flags & + IB_ACCESS_REMOTE_WRITE))) { + goto drop; + } + reth = &ohdr->u.rc.reth; + hdrsize += sizeof(*reth); + qp->r_len = be32_to_cpu(reth->length); + qp->r_rcv_len = 0; + qp->r_sge.sg_list = NULL; + if (qp->r_len != 0) { + u32 rkey = be32_to_cpu(reth->rkey); + u64 vaddr = be64_to_cpu(reth->vaddr); + int ok; + + /* Check rkey */ + ok = qib_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, + vaddr, rkey, IB_ACCESS_REMOTE_WRITE); + if (unlikely(!ok)) + goto drop; + qp->r_sge.num_sge = 1; + } else { + qp->r_sge.num_sge = 0; + qp->r_sge.sge.mr = NULL; + qp->r_sge.sge.vaddr = NULL; + qp->r_sge.sge.length = 0; + qp->r_sge.sge.sge_length = 0; + } + if (opcode == OP(RDMA_WRITE_ONLY)) + goto rdma_last; + else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) + goto rdma_last_imm; + /* FALLTHROUGH */ + case OP(RDMA_WRITE_MIDDLE): + /* Check for invalid length PMTU or posted rwqe len. */ + if (unlikely(tlen != (hdrsize + pmtu + 4))) + goto drop; + qp->r_rcv_len += pmtu; + if (unlikely(qp->r_rcv_len > qp->r_len)) + goto drop; + qib_copy_sge(&qp->r_sge, data, pmtu, 1); + break; + + case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): +rdma_last_imm: + wc.ex.imm_data = ohdr->u.imm_data; + hdrsize += 4; + wc.wc_flags = IB_WC_WITH_IMM; + + /* Get the number of bytes the message was padded by. */ + pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; + /* Check for invalid length. */ + /* XXX LAST len should be >= 1 */ + if (unlikely(tlen < (hdrsize + pad + 4))) + goto drop; + /* Don't count the CRC. */ + tlen -= (hdrsize + pad + 4); + if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) + goto drop; + if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags)) + while (qp->s_rdma_read_sge.num_sge) { + atomic_dec(&qp->s_rdma_read_sge.sge.mr-> + refcount); + if (--qp->s_rdma_read_sge.num_sge) + qp->s_rdma_read_sge.sge = + *qp->s_rdma_read_sge.sg_list++; + } + else { + ret = qib_get_rwqe(qp, 1); + if (ret < 0) + goto op_err; + if (!ret) + goto drop; + } + wc.byte_len = qp->r_len; + wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; + goto last_imm; + + case OP(RDMA_WRITE_LAST): +rdma_last: + /* Get the number of bytes the message was padded by. */ + pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; + /* Check for invalid length. */ + /* XXX LAST len should be >= 1 */ + if (unlikely(tlen < (hdrsize + pad + 4))) + goto drop; + /* Don't count the CRC. */ + tlen -= (hdrsize + pad + 4); + if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) + goto drop; + qib_copy_sge(&qp->r_sge, data, tlen, 1); + while (qp->r_sge.num_sge) { + atomic_dec(&qp->r_sge.sge.mr->refcount); + if (--qp->r_sge.num_sge) + qp->r_sge.sge = *qp->r_sge.sg_list++; + } + break; + + default: + /* Drop packet for unknown opcodes. */ + goto drop; + } + qp->r_psn++; + qp->r_state = opcode; + spin_unlock(&qp->r_lock); + return; + +rewind: + set_bit(QIB_R_REWIND_SGE, &qp->r_aflags); + qp->r_sge.num_sge = 0; +drop: + ibp->n_pkt_drops++; + spin_unlock(&qp->r_lock); + return; + +op_err: + qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); + spin_unlock(&qp->r_lock); + return; + +sunlock: + spin_unlock_irqrestore(&qp->s_lock, flags); +}