--- /dev/null
+/*
+ * Copyright (c) 2006, 2007, 2008 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 "ipath_verbs.h"
+#include "ipath_kernel.h"
+
+/* cut down ridiculously long IB macro names */
+#define OP(x) IB_OPCODE_UC_##x
+
+/**
+ * ipath_make_uc_req - construct a request packet (SEND, RDMA write)
+ * @qp: a pointer to the QP
+ *
+ * Return 1 if constructed; otherwise, return 0.
+ */
+int ipath_make_uc_req(struct ipath_qp *qp)
+{
+ struct ipath_other_headers *ohdr;
+ struct ipath_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_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) {
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_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 |= IPATH_S_WAIT_DMA;
+ goto bail;
+ }
+ wqe = get_swqe_ptr(qp, qp->s_last);
+ ipath_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 = 1 << 22; /* Set M bit */
+
+ /* Get the next send request. */
+ wqe = get_swqe_ptr(qp, qp->s_cur);
+ qp->s_wqe = NULL;
+ switch (qp->s_state) {
+ default:
+ if (!(ib_ipath_state_ops[qp->state] &
+ IPATH_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.
+ */
+ qp->s_psn = wqe->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_len = len = wqe->length;
+ 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 |= 1 << 23;
+ 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 |= 1 << 23;
+ }
+ 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 |= 1 << 23;
+ 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 |= 1 << 23;
+ }
+ 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;
+ ipath_make_ruc_header(to_idev(qp->ibqp.device),
+ qp, ohdr, bth0 | (qp->s_state << 24),
+ qp->s_next_psn++ & IPATH_PSN_MASK);
+done:
+ ret = 1;
+ goto unlock;
+
+bail:
+ qp->s_flags &= ~IPATH_S_BUSY;
+unlock:
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ return ret;
+}
+
+/**
+ * ipath_uc_rcv - handle an incoming UC packet
+ * @dev: the device 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 ipath_qp_rcv() to process an incoming UC packet
+ * for the given QP.
+ * Called at interrupt level.
+ */
+void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
+ int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
+{
+ struct ipath_other_headers *ohdr;
+ int 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 header_in_data;
+
+ /* Validate the SLID. See Ch. 9.6.1.5 */
+ if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid))
+ goto done;
+
+ /* Check for GRH */
+ if (!has_grh) {
+ ohdr = &hdr->u.oth;
+ hdrsize = 8 + 12; /* LRH + BTH */
+ psn = be32_to_cpu(ohdr->bth[2]);
+ header_in_data = 0;
+ } else {
+ ohdr = &hdr->u.l.oth;
+ hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */
+ /*
+ * The header with GRH is 60 bytes and the
+ * core driver sets the eager header buffer
+ * size to 56 bytes so the last 4 bytes of
+ * the BTH header (PSN) is in the data buffer.
+ */
+ header_in_data = dev->dd->ipath_rcvhdrentsize == 16;
+ if (header_in_data) {
+ psn = be32_to_cpu(((__be32 *) data)[0]);
+ data += sizeof(__be32);
+ } else
+ psn = be32_to_cpu(ohdr->bth[2]);
+ }
+ /*
+ * The opcode is in the low byte when its in network order
+ * (top byte when in host order).
+ */
+ opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
+
+ memset(&wc, 0, sizeof wc);
+
+ /* Compare the PSN verses the expected PSN. */
+ if (unlikely(ipath_cmp24(psn, qp->r_psn) != 0)) {
+ /*
+ * Handle a sequence error.
+ * Silently drop any current message.
+ */
+ qp->r_psn = psn;
+ inv:
+ 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:
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ }
+
+ /* 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;
+ }
+
+ /* OK, process the packet. */
+ switch (opcode) {
+ case OP(SEND_FIRST):
+ case OP(SEND_ONLY):
+ case OP(SEND_ONLY_WITH_IMMEDIATE):
+ send_first:
+ if (qp->r_flags & IPATH_R_REUSE_SGE) {
+ qp->r_flags &= ~IPATH_R_REUSE_SGE;
+ qp->r_sge = qp->s_rdma_read_sge;
+ } else if (!ipath_get_rwqe(qp, 0)) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ /* Save the WQE so we can reuse it in case of an error. */
+ 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))) {
+ qp->r_flags |= IPATH_R_REUSE_SGE;
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ qp->r_rcv_len += pmtu;
+ if (unlikely(qp->r_rcv_len > qp->r_len)) {
+ qp->r_flags |= IPATH_R_REUSE_SGE;
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ ipath_copy_sge(&qp->r_sge, data, pmtu);
+ break;
+
+ case OP(SEND_LAST_WITH_IMMEDIATE):
+ send_last_imm:
+ if (header_in_data) {
+ wc.ex.imm_data = *(__be32 *) data;
+ data += sizeof(__be32);
+ } else {
+ /* Immediate data comes after BTH */
+ 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))) {
+ qp->r_flags |= IPATH_R_REUSE_SGE;
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ /* 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)) {
+ qp->r_flags |= IPATH_R_REUSE_SGE;
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ wc.opcode = IB_WC_RECV;
+ last_imm:
+ ipath_copy_sge(&qp->r_sge, data, tlen);
+ 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. */
+ ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
+ (ohdr->bth[0] &
+ cpu_to_be32(1 << 23)) != 0);
+ break;
+
+ case OP(RDMA_WRITE_FIRST):
+ case OP(RDMA_WRITE_ONLY):
+ case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
+ rdma_first:
+ /* RETH comes after BTH */
+ if (!header_in_data)
+ reth = &ohdr->u.rc.reth;
+ else {
+ reth = (struct ib_reth *)data;
+ data += sizeof(*reth);
+ }
+ hdrsize += sizeof(*reth);
+ qp->r_len = be32_to_cpu(reth->length);
+ qp->r_rcv_len = 0;
+ if (qp->r_len != 0) {
+ u32 rkey = be32_to_cpu(reth->rkey);
+ u64 vaddr = be64_to_cpu(reth->vaddr);
+ int ok;
+
+ /* Check rkey */
+ ok = ipath_rkey_ok(qp, &qp->r_sge, qp->r_len,
+ vaddr, rkey,
+ IB_ACCESS_REMOTE_WRITE);
+ if (unlikely(!ok)) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ } else {
+ qp->r_sge.sg_list = NULL;
+ 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 (unlikely(!(qp->qp_access_flags &
+ IB_ACCESS_REMOTE_WRITE))) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ 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))) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ qp->r_rcv_len += pmtu;
+ if (unlikely(qp->r_rcv_len > qp->r_len)) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ ipath_copy_sge(&qp->r_sge, data, pmtu);
+ break;
+
+ case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
+ rdma_last_imm:
+ if (header_in_data) {
+ wc.ex.imm_data = *(__be32 *) data;
+ data += sizeof(__be32);
+ } else {
+ /* Immediate data comes after BTH */
+ 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))) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ /* Don't count the CRC. */
+ tlen -= (hdrsize + pad + 4);
+ if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ if (qp->r_flags & IPATH_R_REUSE_SGE)
+ qp->r_flags &= ~IPATH_R_REUSE_SGE;
+ else if (!ipath_get_rwqe(qp, 1)) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ 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))) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ /* Don't count the CRC. */
+ tlen -= (hdrsize + pad + 4);
+ if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ ipath_copy_sge(&qp->r_sge, data, tlen);
+ break;
+
+ default:
+ /* Drop packet for unknown opcodes. */
+ dev->n_pkt_drops++;
+ goto done;
+ }
+ qp->r_psn++;
+ qp->r_state = opcode;
+done:
+ return;
+}
Code Review / kvmfornfv.git / blobdiff