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6700efdfc0
Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com> Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com> Cc: "Michael S. Tsirkin" <mst@mellanox.co.il> Cc: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1677 lines
44 KiB
C
1677 lines
44 KiB
C
/*
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* Copyright (c) 2006 QLogic, Inc. All rights reserved.
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* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "ipath_verbs.h"
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#include "ips_common.h"
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/* cut down ridiculously long IB macro names */
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#define OP(x) IB_OPCODE_RC_##x
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/**
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* ipath_init_restart- initialize the qp->s_sge after a restart
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* @qp: the QP who's SGE we're restarting
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* @wqe: the work queue to initialize the QP's SGE from
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*
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* The QP s_lock should be held.
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*/
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static void ipath_init_restart(struct ipath_qp *qp, struct ipath_swqe *wqe)
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{
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struct ipath_ibdev *dev;
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u32 len;
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len = ((qp->s_psn - wqe->psn) & IPS_PSN_MASK) *
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ib_mtu_enum_to_int(qp->path_mtu);
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qp->s_sge.sge = wqe->sg_list[0];
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qp->s_sge.sg_list = wqe->sg_list + 1;
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qp->s_sge.num_sge = wqe->wr.num_sge;
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ipath_skip_sge(&qp->s_sge, len);
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qp->s_len = wqe->length - len;
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dev = to_idev(qp->ibqp.device);
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spin_lock(&dev->pending_lock);
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if (list_empty(&qp->timerwait))
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list_add_tail(&qp->timerwait,
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&dev->pending[dev->pending_index]);
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spin_unlock(&dev->pending_lock);
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}
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/**
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* ipath_make_rc_ack - construct a response packet (ACK, NAK, or RDMA read)
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* @qp: a pointer to the QP
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* @ohdr: a pointer to the IB header being constructed
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* @pmtu: the path MTU
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*
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* Return bth0 if constructed; otherwise, return 0.
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* Note the QP s_lock must be held.
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*/
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u32 ipath_make_rc_ack(struct ipath_qp *qp,
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struct ipath_other_headers *ohdr,
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u32 pmtu)
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{
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struct ipath_sge_state *ss;
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u32 hwords;
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u32 len;
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u32 bth0;
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/* header size in 32-bit words LRH+BTH = (8+12)/4. */
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hwords = 5;
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/*
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* Send a response. Note that we are in the responder's
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* side of the QP context.
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*/
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switch (qp->s_ack_state) {
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case OP(RDMA_READ_REQUEST):
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ss = &qp->s_rdma_sge;
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len = qp->s_rdma_len;
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if (len > pmtu) {
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len = pmtu;
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qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST);
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} else
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qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY);
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qp->s_rdma_len -= len;
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bth0 = qp->s_ack_state << 24;
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ohdr->u.aeth = ipath_compute_aeth(qp);
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hwords++;
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break;
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case OP(RDMA_READ_RESPONSE_FIRST):
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qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE);
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/* FALLTHROUGH */
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case OP(RDMA_READ_RESPONSE_MIDDLE):
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ss = &qp->s_rdma_sge;
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len = qp->s_rdma_len;
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if (len > pmtu)
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len = pmtu;
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else {
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ohdr->u.aeth = ipath_compute_aeth(qp);
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hwords++;
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qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
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}
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qp->s_rdma_len -= len;
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bth0 = qp->s_ack_state << 24;
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break;
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case OP(RDMA_READ_RESPONSE_LAST):
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case OP(RDMA_READ_RESPONSE_ONLY):
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/*
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* We have to prevent new requests from changing
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* the r_sge state while a ipath_verbs_send()
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* is in progress.
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* Changing r_state allows the receiver
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* to continue processing new packets.
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* We do it here now instead of above so
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* that we are sure the packet was sent before
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* changing the state.
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*/
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qp->r_state = OP(RDMA_READ_RESPONSE_LAST);
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qp->s_ack_state = OP(ACKNOWLEDGE);
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return 0;
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case OP(COMPARE_SWAP):
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case OP(FETCH_ADD):
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ss = NULL;
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len = 0;
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qp->r_state = OP(SEND_LAST);
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qp->s_ack_state = OP(ACKNOWLEDGE);
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bth0 = IB_OPCODE_ATOMIC_ACKNOWLEDGE << 24;
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ohdr->u.at.aeth = ipath_compute_aeth(qp);
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ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->s_ack_atomic);
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hwords += sizeof(ohdr->u.at) / 4;
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break;
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default:
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/* Send a regular ACK. */
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ss = NULL;
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len = 0;
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qp->s_ack_state = OP(ACKNOWLEDGE);
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bth0 = qp->s_ack_state << 24;
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ohdr->u.aeth = ipath_compute_aeth(qp);
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hwords++;
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}
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qp->s_hdrwords = hwords;
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qp->s_cur_sge = ss;
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qp->s_cur_size = len;
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return bth0;
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}
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/**
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* ipath_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC)
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* @qp: a pointer to the QP
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* @ohdr: a pointer to the IB header being constructed
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* @pmtu: the path MTU
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* @bth0p: pointer to the BTH opcode word
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* @bth2p: pointer to the BTH PSN word
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*
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* Return 1 if constructed; otherwise, return 0.
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* Note the QP s_lock must be held.
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*/
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int ipath_make_rc_req(struct ipath_qp *qp,
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struct ipath_other_headers *ohdr,
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u32 pmtu, u32 *bth0p, u32 *bth2p)
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{
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struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
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struct ipath_sge_state *ss;
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struct ipath_swqe *wqe;
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u32 hwords;
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u32 len;
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u32 bth0;
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u32 bth2;
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char newreq;
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if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) ||
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qp->s_rnr_timeout)
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goto done;
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/* header size in 32-bit words LRH+BTH = (8+12)/4. */
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hwords = 5;
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bth0 = 0;
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/* Send a request. */
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wqe = get_swqe_ptr(qp, qp->s_cur);
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switch (qp->s_state) {
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default:
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/*
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* Resend an old request or start a new one.
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*
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* We keep track of the current SWQE so that
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* we don't reset the "furthest progress" state
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* if we need to back up.
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*/
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newreq = 0;
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if (qp->s_cur == qp->s_tail) {
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/* Check if send work queue is empty. */
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if (qp->s_tail == qp->s_head)
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goto done;
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qp->s_psn = wqe->psn = qp->s_next_psn;
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newreq = 1;
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}
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/*
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* Note that we have to be careful not to modify the
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* original work request since we may need to resend
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* it.
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*/
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qp->s_sge.sge = wqe->sg_list[0];
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qp->s_sge.sg_list = wqe->sg_list + 1;
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qp->s_sge.num_sge = wqe->wr.num_sge;
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qp->s_len = len = wqe->length;
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ss = &qp->s_sge;
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bth2 = 0;
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switch (wqe->wr.opcode) {
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case IB_WR_SEND:
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case IB_WR_SEND_WITH_IMM:
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/* If no credit, return. */
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if (qp->s_lsn != (u32) -1 &&
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ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0)
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goto done;
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wqe->lpsn = wqe->psn;
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if (len > pmtu) {
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wqe->lpsn += (len - 1) / pmtu;
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qp->s_state = OP(SEND_FIRST);
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len = pmtu;
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break;
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}
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if (wqe->wr.opcode == IB_WR_SEND)
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qp->s_state = OP(SEND_ONLY);
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else {
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qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE);
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/* Immediate data comes after the BTH */
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ohdr->u.imm_data = wqe->wr.imm_data;
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hwords += 1;
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}
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if (wqe->wr.send_flags & IB_SEND_SOLICITED)
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bth0 |= 1 << 23;
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bth2 = 1 << 31; /* Request ACK. */
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if (++qp->s_cur == qp->s_size)
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qp->s_cur = 0;
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break;
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case IB_WR_RDMA_WRITE:
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if (newreq && qp->s_lsn != (u32) -1)
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qp->s_lsn++;
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/* FALLTHROUGH */
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case IB_WR_RDMA_WRITE_WITH_IMM:
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/* If no credit, return. */
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if (qp->s_lsn != (u32) -1 &&
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ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0)
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goto done;
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ohdr->u.rc.reth.vaddr =
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cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
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ohdr->u.rc.reth.rkey =
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cpu_to_be32(wqe->wr.wr.rdma.rkey);
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ohdr->u.rc.reth.length = cpu_to_be32(len);
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hwords += sizeof(struct ib_reth) / 4;
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wqe->lpsn = wqe->psn;
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if (len > pmtu) {
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wqe->lpsn += (len - 1) / pmtu;
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qp->s_state = OP(RDMA_WRITE_FIRST);
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len = pmtu;
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break;
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}
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if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
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qp->s_state = OP(RDMA_WRITE_ONLY);
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else {
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qp->s_state =
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OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
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/* Immediate data comes after RETH */
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ohdr->u.rc.imm_data = wqe->wr.imm_data;
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hwords += 1;
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if (wqe->wr.send_flags & IB_SEND_SOLICITED)
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bth0 |= 1 << 23;
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}
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bth2 = 1 << 31; /* Request ACK. */
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if (++qp->s_cur == qp->s_size)
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qp->s_cur = 0;
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break;
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case IB_WR_RDMA_READ:
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ohdr->u.rc.reth.vaddr =
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cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
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ohdr->u.rc.reth.rkey =
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cpu_to_be32(wqe->wr.wr.rdma.rkey);
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ohdr->u.rc.reth.length = cpu_to_be32(len);
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qp->s_state = OP(RDMA_READ_REQUEST);
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hwords += sizeof(ohdr->u.rc.reth) / 4;
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if (newreq) {
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if (qp->s_lsn != (u32) -1)
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qp->s_lsn++;
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/*
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* Adjust s_next_psn to count the
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* expected number of responses.
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*/
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if (len > pmtu)
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qp->s_next_psn += (len - 1) / pmtu;
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wqe->lpsn = qp->s_next_psn++;
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}
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ss = NULL;
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len = 0;
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if (++qp->s_cur == qp->s_size)
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qp->s_cur = 0;
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break;
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case IB_WR_ATOMIC_CMP_AND_SWP:
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case IB_WR_ATOMIC_FETCH_AND_ADD:
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if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP)
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qp->s_state = OP(COMPARE_SWAP);
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else
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qp->s_state = OP(FETCH_ADD);
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ohdr->u.atomic_eth.vaddr = cpu_to_be64(
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wqe->wr.wr.atomic.remote_addr);
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ohdr->u.atomic_eth.rkey = cpu_to_be32(
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wqe->wr.wr.atomic.rkey);
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ohdr->u.atomic_eth.swap_data = cpu_to_be64(
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wqe->wr.wr.atomic.swap);
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ohdr->u.atomic_eth.compare_data = cpu_to_be64(
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wqe->wr.wr.atomic.compare_add);
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hwords += sizeof(struct ib_atomic_eth) / 4;
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if (newreq) {
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if (qp->s_lsn != (u32) -1)
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qp->s_lsn++;
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wqe->lpsn = wqe->psn;
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}
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if (++qp->s_cur == qp->s_size)
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qp->s_cur = 0;
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ss = NULL;
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len = 0;
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break;
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default:
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goto done;
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}
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if (newreq) {
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qp->s_tail++;
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if (qp->s_tail >= qp->s_size)
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qp->s_tail = 0;
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}
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bth2 |= qp->s_psn++ & IPS_PSN_MASK;
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if ((int)(qp->s_psn - qp->s_next_psn) > 0)
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qp->s_next_psn = qp->s_psn;
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spin_lock(&dev->pending_lock);
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if (list_empty(&qp->timerwait))
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list_add_tail(&qp->timerwait,
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&dev->pending[dev->pending_index]);
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spin_unlock(&dev->pending_lock);
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break;
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case OP(RDMA_READ_RESPONSE_FIRST):
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/*
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* This case can only happen if a send is restarted. See
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* ipath_restart_rc().
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*/
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ipath_init_restart(qp, wqe);
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/* FALLTHROUGH */
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case OP(SEND_FIRST):
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qp->s_state = OP(SEND_MIDDLE);
|
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/* FALLTHROUGH */
|
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case OP(SEND_MIDDLE):
|
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bth2 = qp->s_psn++ & IPS_PSN_MASK;
|
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if ((int)(qp->s_psn - qp->s_next_psn) > 0)
|
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qp->s_next_psn = qp->s_psn;
|
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ss = &qp->s_sge;
|
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len = qp->s_len;
|
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if (len > pmtu) {
|
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/*
|
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* Request an ACK every 1/2 MB to avoid retransmit
|
|
* timeouts.
|
|
*/
|
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if (((wqe->length - len) % (512 * 1024)) == 0)
|
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bth2 |= 1 << 31;
|
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len = pmtu;
|
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break;
|
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}
|
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if (wqe->wr.opcode == IB_WR_SEND)
|
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qp->s_state = OP(SEND_LAST);
|
|
else {
|
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qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
|
|
/* Immediate data comes after the BTH */
|
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ohdr->u.imm_data = wqe->wr.imm_data;
|
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hwords += 1;
|
|
}
|
|
if (wqe->wr.send_flags & IB_SEND_SOLICITED)
|
|
bth0 |= 1 << 23;
|
|
bth2 |= 1 << 31; /* Request ACK. */
|
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qp->s_cur++;
|
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if (qp->s_cur >= qp->s_size)
|
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qp->s_cur = 0;
|
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break;
|
|
|
|
case OP(RDMA_READ_RESPONSE_LAST):
|
|
/*
|
|
* This case can only happen if a RDMA write is restarted.
|
|
* See ipath_restart_rc().
|
|
*/
|
|
ipath_init_restart(qp, wqe);
|
|
/* FALLTHROUGH */
|
|
case OP(RDMA_WRITE_FIRST):
|
|
qp->s_state = OP(RDMA_WRITE_MIDDLE);
|
|
/* FALLTHROUGH */
|
|
case OP(RDMA_WRITE_MIDDLE):
|
|
bth2 = qp->s_psn++ & IPS_PSN_MASK;
|
|
if ((int)(qp->s_psn - qp->s_next_psn) > 0)
|
|
qp->s_next_psn = qp->s_psn;
|
|
ss = &qp->s_sge;
|
|
len = qp->s_len;
|
|
if (len > pmtu) {
|
|
/*
|
|
* Request an ACK every 1/2 MB to avoid retransmit
|
|
* timeouts.
|
|
*/
|
|
if (((wqe->length - len) % (512 * 1024)) == 0)
|
|
bth2 |= 1 << 31;
|
|
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.imm_data;
|
|
hwords += 1;
|
|
if (wqe->wr.send_flags & IB_SEND_SOLICITED)
|
|
bth0 |= 1 << 23;
|
|
}
|
|
bth2 |= 1 << 31; /* Request ACK. */
|
|
qp->s_cur++;
|
|
if (qp->s_cur >= qp->s_size)
|
|
qp->s_cur = 0;
|
|
break;
|
|
|
|
case OP(RDMA_READ_RESPONSE_MIDDLE):
|
|
/*
|
|
* This case can only happen if a RDMA read is restarted.
|
|
* See ipath_restart_rc().
|
|
*/
|
|
ipath_init_restart(qp, wqe);
|
|
len = ((qp->s_psn - wqe->psn) & IPS_PSN_MASK) * pmtu;
|
|
ohdr->u.rc.reth.vaddr =
|
|
cpu_to_be64(wqe->wr.wr.rdma.remote_addr + len);
|
|
ohdr->u.rc.reth.rkey =
|
|
cpu_to_be32(wqe->wr.wr.rdma.rkey);
|
|
ohdr->u.rc.reth.length = cpu_to_be32(qp->s_len);
|
|
qp->s_state = OP(RDMA_READ_REQUEST);
|
|
hwords += sizeof(ohdr->u.rc.reth) / 4;
|
|
bth2 = qp->s_psn++ & IPS_PSN_MASK;
|
|
if ((int)(qp->s_psn - qp->s_next_psn) > 0)
|
|
qp->s_next_psn = qp->s_psn;
|
|
ss = NULL;
|
|
len = 0;
|
|
qp->s_cur++;
|
|
if (qp->s_cur == qp->s_size)
|
|
qp->s_cur = 0;
|
|
break;
|
|
|
|
case OP(RDMA_READ_REQUEST):
|
|
case OP(COMPARE_SWAP):
|
|
case OP(FETCH_ADD):
|
|
/*
|
|
* We shouldn't start anything new until this request is
|
|
* finished. The ACK will handle rescheduling us. XXX The
|
|
* number of outstanding ones is negotiated at connection
|
|
* setup time (see pg. 258,289)? XXX Also, if we support
|
|
* multiple outstanding requests, we need to check the WQE
|
|
* IB_SEND_FENCE flag and not send a new request if a RDMA
|
|
* read or atomic is pending.
|
|
*/
|
|
goto done;
|
|
}
|
|
qp->s_len -= len;
|
|
qp->s_hdrwords = hwords;
|
|
qp->s_cur_sge = ss;
|
|
qp->s_cur_size = len;
|
|
*bth0p = bth0 | (qp->s_state << 24);
|
|
*bth2p = bth2;
|
|
return 1;
|
|
|
|
done:
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* send_rc_ack - Construct an ACK packet and send it
|
|
* @qp: a pointer to the QP
|
|
*
|
|
* This is called from ipath_rc_rcv() and only uses the receive
|
|
* side QP state.
|
|
* Note that RDMA reads are handled in the send side QP state and tasklet.
|
|
*/
|
|
static void send_rc_ack(struct ipath_qp *qp)
|
|
{
|
|
struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
|
|
u16 lrh0;
|
|
u32 bth0;
|
|
u32 hwords;
|
|
struct ipath_ib_header hdr;
|
|
struct ipath_other_headers *ohdr;
|
|
|
|
/* Construct the header. */
|
|
ohdr = &hdr.u.oth;
|
|
lrh0 = IPS_LRH_BTH;
|
|
/* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */
|
|
hwords = 6;
|
|
if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
|
|
hwords += ipath_make_grh(dev, &hdr.u.l.grh,
|
|
&qp->remote_ah_attr.grh,
|
|
hwords, 0);
|
|
ohdr = &hdr.u.l.oth;
|
|
lrh0 = IPS_LRH_GRH;
|
|
}
|
|
bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index);
|
|
ohdr->u.aeth = ipath_compute_aeth(qp);
|
|
if (qp->s_ack_state >= OP(COMPARE_SWAP)) {
|
|
bth0 |= IB_OPCODE_ATOMIC_ACKNOWLEDGE << 24;
|
|
ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->s_ack_atomic);
|
|
hwords += sizeof(ohdr->u.at.atomic_ack_eth) / 4;
|
|
} else
|
|
bth0 |= OP(ACKNOWLEDGE) << 24;
|
|
lrh0 |= qp->remote_ah_attr.sl << 4;
|
|
hdr.lrh[0] = cpu_to_be16(lrh0);
|
|
hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
|
|
hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC);
|
|
hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
|
|
ohdr->bth[0] = cpu_to_be32(bth0);
|
|
ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
|
|
ohdr->bth[2] = cpu_to_be32(qp->s_ack_psn & IPS_PSN_MASK);
|
|
|
|
/*
|
|
* If we can send the ACK, clear the ACK state.
|
|
*/
|
|
if (ipath_verbs_send(dev->dd, hwords, (u32 *) &hdr, 0, NULL) == 0) {
|
|
qp->s_ack_state = OP(ACKNOWLEDGE);
|
|
dev->n_rc_qacks++;
|
|
dev->n_unicast_xmit++;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* reset_psn - reset the QP state to send starting from PSN
|
|
* @qp: the QP
|
|
* @psn: the packet sequence number to restart at
|
|
*
|
|
* This is called from ipath_rc_rcv() to process an incoming RC ACK
|
|
* for the given QP.
|
|
* Called at interrupt level with the QP s_lock held.
|
|
*/
|
|
static void reset_psn(struct ipath_qp *qp, u32 psn)
|
|
{
|
|
u32 n = qp->s_last;
|
|
struct ipath_swqe *wqe = get_swqe_ptr(qp, n);
|
|
u32 opcode;
|
|
|
|
qp->s_cur = n;
|
|
|
|
/*
|
|
* If we are starting the request from the beginning,
|
|
* let the normal send code handle initialization.
|
|
*/
|
|
if (ipath_cmp24(psn, wqe->psn) <= 0) {
|
|
qp->s_state = OP(SEND_LAST);
|
|
goto done;
|
|
}
|
|
|
|
/* Find the work request opcode corresponding to the given PSN. */
|
|
opcode = wqe->wr.opcode;
|
|
for (;;) {
|
|
int diff;
|
|
|
|
if (++n == qp->s_size)
|
|
n = 0;
|
|
if (n == qp->s_tail)
|
|
break;
|
|
wqe = get_swqe_ptr(qp, n);
|
|
diff = ipath_cmp24(psn, wqe->psn);
|
|
if (diff < 0)
|
|
break;
|
|
qp->s_cur = n;
|
|
/*
|
|
* If we are starting the request from the beginning,
|
|
* let the normal send code handle initialization.
|
|
*/
|
|
if (diff == 0) {
|
|
qp->s_state = OP(SEND_LAST);
|
|
goto done;
|
|
}
|
|
opcode = wqe->wr.opcode;
|
|
}
|
|
|
|
/*
|
|
* Set the state to restart in the middle of a request.
|
|
* Don't change the s_sge, s_cur_sge, or s_cur_size.
|
|
* See ipath_do_rc_send().
|
|
*/
|
|
switch (opcode) {
|
|
case IB_WR_SEND:
|
|
case IB_WR_SEND_WITH_IMM:
|
|
qp->s_state = OP(RDMA_READ_RESPONSE_FIRST);
|
|
break;
|
|
|
|
case IB_WR_RDMA_WRITE:
|
|
case IB_WR_RDMA_WRITE_WITH_IMM:
|
|
qp->s_state = OP(RDMA_READ_RESPONSE_LAST);
|
|
break;
|
|
|
|
case IB_WR_RDMA_READ:
|
|
qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE);
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* This case shouldn't happen since its only
|
|
* one PSN per req.
|
|
*/
|
|
qp->s_state = OP(SEND_LAST);
|
|
}
|
|
done:
|
|
qp->s_psn = psn;
|
|
}
|
|
|
|
/**
|
|
* ipath_restart_rc - back up requester to resend the last un-ACKed request
|
|
* @qp: the QP to restart
|
|
* @psn: packet sequence number for the request
|
|
* @wc: the work completion request
|
|
*
|
|
* The QP s_lock should be held.
|
|
*/
|
|
void ipath_restart_rc(struct ipath_qp *qp, u32 psn, struct ib_wc *wc)
|
|
{
|
|
struct ipath_swqe *wqe = get_swqe_ptr(qp, qp->s_last);
|
|
struct ipath_ibdev *dev;
|
|
|
|
/*
|
|
* If there are no requests pending, we are done.
|
|
*/
|
|
if (ipath_cmp24(psn, qp->s_next_psn) >= 0 ||
|
|
qp->s_last == qp->s_tail)
|
|
goto done;
|
|
|
|
if (qp->s_retry == 0) {
|
|
wc->wr_id = wqe->wr.wr_id;
|
|
wc->status = IB_WC_RETRY_EXC_ERR;
|
|
wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
|
|
wc->vendor_err = 0;
|
|
wc->byte_len = 0;
|
|
wc->qp_num = qp->ibqp.qp_num;
|
|
wc->src_qp = qp->remote_qpn;
|
|
wc->pkey_index = 0;
|
|
wc->slid = qp->remote_ah_attr.dlid;
|
|
wc->sl = qp->remote_ah_attr.sl;
|
|
wc->dlid_path_bits = 0;
|
|
wc->port_num = 0;
|
|
ipath_sqerror_qp(qp, wc);
|
|
goto bail;
|
|
}
|
|
qp->s_retry--;
|
|
|
|
/*
|
|
* Remove the QP from the timeout queue.
|
|
* Note: it may already have been removed by ipath_ib_timer().
|
|
*/
|
|
dev = to_idev(qp->ibqp.device);
|
|
spin_lock(&dev->pending_lock);
|
|
if (!list_empty(&qp->timerwait))
|
|
list_del_init(&qp->timerwait);
|
|
spin_unlock(&dev->pending_lock);
|
|
|
|
if (wqe->wr.opcode == IB_WR_RDMA_READ)
|
|
dev->n_rc_resends++;
|
|
else
|
|
dev->n_rc_resends += (int)qp->s_psn - (int)psn;
|
|
|
|
reset_psn(qp, psn);
|
|
|
|
done:
|
|
tasklet_hi_schedule(&qp->s_task);
|
|
|
|
bail:
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* do_rc_ack - process an incoming RC ACK
|
|
* @qp: the QP the ACK came in on
|
|
* @psn: the packet sequence number of the ACK
|
|
* @opcode: the opcode of the request that resulted in the ACK
|
|
*
|
|
* This is called from ipath_rc_rcv_resp() to process an incoming RC ACK
|
|
* for the given QP.
|
|
* Called at interrupt level with the QP s_lock held.
|
|
* Returns 1 if OK, 0 if current operation should be aborted (NAK).
|
|
*/
|
|
static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode)
|
|
{
|
|
struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
|
|
struct ib_wc wc;
|
|
struct ipath_swqe *wqe;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Remove the QP from the timeout queue (or RNR timeout queue).
|
|
* If ipath_ib_timer() has already removed it,
|
|
* it's OK since we hold the QP s_lock and ipath_restart_rc()
|
|
* just won't find anything to restart if we ACK everything.
|
|
*/
|
|
spin_lock(&dev->pending_lock);
|
|
if (!list_empty(&qp->timerwait))
|
|
list_del_init(&qp->timerwait);
|
|
spin_unlock(&dev->pending_lock);
|
|
|
|
/*
|
|
* Note that NAKs implicitly ACK outstanding SEND and RDMA write
|
|
* requests and implicitly NAK RDMA read and atomic requests issued
|
|
* before the NAK'ed request. The MSN won't include the NAK'ed
|
|
* request but will include an ACK'ed request(s).
|
|
*/
|
|
wqe = get_swqe_ptr(qp, qp->s_last);
|
|
|
|
/* Nothing is pending to ACK/NAK. */
|
|
if (qp->s_last == qp->s_tail)
|
|
goto bail;
|
|
|
|
/*
|
|
* The MSN might be for a later WQE than the PSN indicates so
|
|
* only complete WQEs that the PSN finishes.
|
|
*/
|
|
while (ipath_cmp24(psn, wqe->lpsn) >= 0) {
|
|
/* If we are ACKing a WQE, the MSN should be >= the SSN. */
|
|
if (ipath_cmp24(aeth, wqe->ssn) < 0)
|
|
break;
|
|
/*
|
|
* If this request is a RDMA read or atomic, and the ACK is
|
|
* for a later operation, this ACK NAKs the RDMA read or
|
|
* atomic. In other words, only a RDMA_READ_LAST or ONLY
|
|
* can ACK a RDMA read and likewise for atomic ops. Note
|
|
* that the NAK case can only happen if relaxed ordering is
|
|
* used and requests are sent after an RDMA read or atomic
|
|
* is sent but before the response is received.
|
|
*/
|
|
if ((wqe->wr.opcode == IB_WR_RDMA_READ &&
|
|
opcode != OP(RDMA_READ_RESPONSE_LAST)) ||
|
|
((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
|
|
wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) &&
|
|
(opcode != OP(ATOMIC_ACKNOWLEDGE) ||
|
|
ipath_cmp24(wqe->psn, psn) != 0))) {
|
|
/*
|
|
* The last valid PSN seen is the previous
|
|
* request's.
|
|
*/
|
|
qp->s_last_psn = wqe->psn - 1;
|
|
/* Retry this request. */
|
|
ipath_restart_rc(qp, wqe->psn, &wc);
|
|
/*
|
|
* No need to process the ACK/NAK since we are
|
|
* restarting an earlier request.
|
|
*/
|
|
goto bail;
|
|
}
|
|
/* Post a send completion queue entry if requested. */
|
|
if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &qp->s_flags) ||
|
|
(wqe->wr.send_flags & IB_SEND_SIGNALED)) {
|
|
wc.wr_id = wqe->wr.wr_id;
|
|
wc.status = IB_WC_SUCCESS;
|
|
wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
|
|
wc.vendor_err = 0;
|
|
wc.byte_len = wqe->length;
|
|
wc.qp_num = qp->ibqp.qp_num;
|
|
wc.src_qp = qp->remote_qpn;
|
|
wc.pkey_index = 0;
|
|
wc.slid = qp->remote_ah_attr.dlid;
|
|
wc.sl = qp->remote_ah_attr.sl;
|
|
wc.dlid_path_bits = 0;
|
|
wc.port_num = 0;
|
|
ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0);
|
|
}
|
|
qp->s_retry = qp->s_retry_cnt;
|
|
/*
|
|
* If we are completing a request which is in the process of
|
|
* being resent, we can stop resending it since we know the
|
|
* responder has already seen it.
|
|
*/
|
|
if (qp->s_last == qp->s_cur) {
|
|
if (++qp->s_cur >= qp->s_size)
|
|
qp->s_cur = 0;
|
|
wqe = get_swqe_ptr(qp, qp->s_cur);
|
|
qp->s_state = OP(SEND_LAST);
|
|
qp->s_psn = wqe->psn;
|
|
}
|
|
if (++qp->s_last >= qp->s_size)
|
|
qp->s_last = 0;
|
|
wqe = get_swqe_ptr(qp, qp->s_last);
|
|
if (qp->s_last == qp->s_tail)
|
|
break;
|
|
}
|
|
|
|
switch (aeth >> 29) {
|
|
case 0: /* ACK */
|
|
dev->n_rc_acks++;
|
|
/* If this is a partial ACK, reset the retransmit timer. */
|
|
if (qp->s_last != qp->s_tail) {
|
|
spin_lock(&dev->pending_lock);
|
|
list_add_tail(&qp->timerwait,
|
|
&dev->pending[dev->pending_index]);
|
|
spin_unlock(&dev->pending_lock);
|
|
}
|
|
ipath_get_credit(qp, aeth);
|
|
qp->s_rnr_retry = qp->s_rnr_retry_cnt;
|
|
qp->s_retry = qp->s_retry_cnt;
|
|
qp->s_last_psn = psn;
|
|
ret = 1;
|
|
goto bail;
|
|
|
|
case 1: /* RNR NAK */
|
|
dev->n_rnr_naks++;
|
|
if (qp->s_rnr_retry == 0) {
|
|
if (qp->s_last == qp->s_tail)
|
|
goto bail;
|
|
|
|
wc.status = IB_WC_RNR_RETRY_EXC_ERR;
|
|
goto class_b;
|
|
}
|
|
if (qp->s_rnr_retry_cnt < 7)
|
|
qp->s_rnr_retry--;
|
|
if (qp->s_last == qp->s_tail)
|
|
goto bail;
|
|
|
|
/* The last valid PSN is the previous PSN. */
|
|
qp->s_last_psn = psn - 1;
|
|
|
|
dev->n_rc_resends += (int)qp->s_psn - (int)psn;
|
|
|
|
reset_psn(qp, psn);
|
|
|
|
qp->s_rnr_timeout =
|
|
ib_ipath_rnr_table[(aeth >> IPS_AETH_CREDIT_SHIFT) &
|
|
IPS_AETH_CREDIT_MASK];
|
|
ipath_insert_rnr_queue(qp);
|
|
goto bail;
|
|
|
|
case 3: /* NAK */
|
|
/* The last valid PSN seen is the previous request's. */
|
|
if (qp->s_last != qp->s_tail)
|
|
qp->s_last_psn = wqe->psn - 1;
|
|
switch ((aeth >> IPS_AETH_CREDIT_SHIFT) &
|
|
IPS_AETH_CREDIT_MASK) {
|
|
case 0: /* PSN sequence error */
|
|
dev->n_seq_naks++;
|
|
/*
|
|
* Back up to the responder's expected PSN. XXX
|
|
* Note that we might get a NAK in the middle of an
|
|
* RDMA READ response which terminates the RDMA
|
|
* READ.
|
|
*/
|
|
if (qp->s_last == qp->s_tail)
|
|
break;
|
|
|
|
if (ipath_cmp24(psn, wqe->psn) < 0)
|
|
break;
|
|
|
|
/* Retry the request. */
|
|
ipath_restart_rc(qp, psn, &wc);
|
|
break;
|
|
|
|
case 1: /* Invalid Request */
|
|
wc.status = IB_WC_REM_INV_REQ_ERR;
|
|
dev->n_other_naks++;
|
|
goto class_b;
|
|
|
|
case 2: /* Remote Access Error */
|
|
wc.status = IB_WC_REM_ACCESS_ERR;
|
|
dev->n_other_naks++;
|
|
goto class_b;
|
|
|
|
case 3: /* Remote Operation Error */
|
|
wc.status = IB_WC_REM_OP_ERR;
|
|
dev->n_other_naks++;
|
|
class_b:
|
|
wc.wr_id = wqe->wr.wr_id;
|
|
wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
|
|
wc.vendor_err = 0;
|
|
wc.byte_len = 0;
|
|
wc.qp_num = qp->ibqp.qp_num;
|
|
wc.src_qp = qp->remote_qpn;
|
|
wc.pkey_index = 0;
|
|
wc.slid = qp->remote_ah_attr.dlid;
|
|
wc.sl = qp->remote_ah_attr.sl;
|
|
wc.dlid_path_bits = 0;
|
|
wc.port_num = 0;
|
|
ipath_sqerror_qp(qp, &wc);
|
|
break;
|
|
|
|
default:
|
|
/* Ignore other reserved NAK error codes */
|
|
goto reserved;
|
|
}
|
|
qp->s_rnr_retry = qp->s_rnr_retry_cnt;
|
|
goto bail;
|
|
|
|
default: /* 2: reserved */
|
|
reserved:
|
|
/* Ignore reserved NAK codes. */
|
|
goto bail;
|
|
}
|
|
|
|
bail:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ipath_rc_rcv_resp - process an incoming RC response packet
|
|
* @dev: the device this packet came in on
|
|
* @ohdr: the other headers for this packet
|
|
* @data: the packet data
|
|
* @tlen: the packet length
|
|
* @qp: the QP for this packet
|
|
* @opcode: the opcode for this packet
|
|
* @psn: the packet sequence number for this packet
|
|
* @hdrsize: the header length
|
|
* @pmtu: the path MTU
|
|
* @header_in_data: true if part of the header data is in the data buffer
|
|
*
|
|
* This is called from ipath_rc_rcv() to process an incoming RC response
|
|
* packet for the given QP.
|
|
* Called at interrupt level.
|
|
*/
|
|
static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev,
|
|
struct ipath_other_headers *ohdr,
|
|
void *data, u32 tlen,
|
|
struct ipath_qp *qp,
|
|
u32 opcode,
|
|
u32 psn, u32 hdrsize, u32 pmtu,
|
|
int header_in_data)
|
|
{
|
|
unsigned long flags;
|
|
struct ib_wc wc;
|
|
int diff;
|
|
u32 pad;
|
|
u32 aeth;
|
|
|
|
spin_lock_irqsave(&qp->s_lock, flags);
|
|
|
|
/* Ignore invalid responses. */
|
|
if (ipath_cmp24(psn, qp->s_next_psn) >= 0)
|
|
goto ack_done;
|
|
|
|
/* Ignore duplicate responses. */
|
|
diff = ipath_cmp24(psn, qp->s_last_psn);
|
|
if (unlikely(diff <= 0)) {
|
|
/* Update credits for "ghost" ACKs */
|
|
if (diff == 0 && opcode == OP(ACKNOWLEDGE)) {
|
|
if (!header_in_data)
|
|
aeth = be32_to_cpu(ohdr->u.aeth);
|
|
else {
|
|
aeth = be32_to_cpu(((__be32 *) data)[0]);
|
|
data += sizeof(__be32);
|
|
}
|
|
if ((aeth >> 29) == 0)
|
|
ipath_get_credit(qp, aeth);
|
|
}
|
|
goto ack_done;
|
|
}
|
|
|
|
switch (opcode) {
|
|
case OP(ACKNOWLEDGE):
|
|
case OP(ATOMIC_ACKNOWLEDGE):
|
|
case OP(RDMA_READ_RESPONSE_FIRST):
|
|
if (!header_in_data)
|
|
aeth = be32_to_cpu(ohdr->u.aeth);
|
|
else {
|
|
aeth = be32_to_cpu(((__be32 *) data)[0]);
|
|
data += sizeof(__be32);
|
|
}
|
|
if (opcode == OP(ATOMIC_ACKNOWLEDGE))
|
|
*(u64 *) qp->s_sge.sge.vaddr = *(u64 *) data;
|
|
if (!do_rc_ack(qp, aeth, psn, opcode) ||
|
|
opcode != OP(RDMA_READ_RESPONSE_FIRST))
|
|
goto ack_done;
|
|
hdrsize += 4;
|
|
/*
|
|
* do_rc_ack() has already checked the PSN so skip
|
|
* the sequence check.
|
|
*/
|
|
goto rdma_read;
|
|
|
|
case OP(RDMA_READ_RESPONSE_MIDDLE):
|
|
/* no AETH, no ACK */
|
|
if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) {
|
|
dev->n_rdma_seq++;
|
|
ipath_restart_rc(qp, qp->s_last_psn + 1, &wc);
|
|
goto ack_done;
|
|
}
|
|
rdma_read:
|
|
if (unlikely(qp->s_state != OP(RDMA_READ_REQUEST)))
|
|
goto ack_done;
|
|
if (unlikely(tlen != (hdrsize + pmtu + 4)))
|
|
goto ack_done;
|
|
if (unlikely(pmtu >= qp->s_len))
|
|
goto ack_done;
|
|
/* We got a response so update the timeout. */
|
|
if (unlikely(qp->s_last == qp->s_tail ||
|
|
get_swqe_ptr(qp, qp->s_last)->wr.opcode !=
|
|
IB_WR_RDMA_READ))
|
|
goto ack_done;
|
|
spin_lock(&dev->pending_lock);
|
|
if (qp->s_rnr_timeout == 0 && !list_empty(&qp->timerwait))
|
|
list_move_tail(&qp->timerwait,
|
|
&dev->pending[dev->pending_index]);
|
|
spin_unlock(&dev->pending_lock);
|
|
/*
|
|
* Update the RDMA receive state but do the copy w/o
|
|
* holding the locks and blocking interrupts.
|
|
* XXX Yet another place that affects relaxed RDMA order
|
|
* since we don't want s_sge modified.
|
|
*/
|
|
qp->s_len -= pmtu;
|
|
qp->s_last_psn = psn;
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
ipath_copy_sge(&qp->s_sge, data, pmtu);
|
|
goto bail;
|
|
|
|
case OP(RDMA_READ_RESPONSE_LAST):
|
|
/* ACKs READ req. */
|
|
if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) {
|
|
dev->n_rdma_seq++;
|
|
ipath_restart_rc(qp, qp->s_last_psn + 1, &wc);
|
|
goto ack_done;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case OP(RDMA_READ_RESPONSE_ONLY):
|
|
if (unlikely(qp->s_state != OP(RDMA_READ_REQUEST)))
|
|
goto ack_done;
|
|
/*
|
|
* Get the number of bytes the message was padded by.
|
|
*/
|
|
pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
|
|
/*
|
|
* Check that the data size is >= 1 && <= pmtu.
|
|
* Remember to account for the AETH header (4) and
|
|
* ICRC (4).
|
|
*/
|
|
if (unlikely(tlen <= (hdrsize + pad + 8))) {
|
|
/* XXX Need to generate an error CQ entry. */
|
|
goto ack_done;
|
|
}
|
|
tlen -= hdrsize + pad + 8;
|
|
if (unlikely(tlen != qp->s_len)) {
|
|
/* XXX Need to generate an error CQ entry. */
|
|
goto ack_done;
|
|
}
|
|
if (!header_in_data)
|
|
aeth = be32_to_cpu(ohdr->u.aeth);
|
|
else {
|
|
aeth = be32_to_cpu(((__be32 *) data)[0]);
|
|
data += sizeof(__be32);
|
|
}
|
|
ipath_copy_sge(&qp->s_sge, data, tlen);
|
|
if (do_rc_ack(qp, aeth, psn, OP(RDMA_READ_RESPONSE_LAST))) {
|
|
/*
|
|
* Change the state so we contimue
|
|
* processing new requests and wake up the
|
|
* tasklet if there are posted sends.
|
|
*/
|
|
qp->s_state = OP(SEND_LAST);
|
|
if (qp->s_tail != qp->s_head)
|
|
tasklet_hi_schedule(&qp->s_task);
|
|
}
|
|
goto ack_done;
|
|
}
|
|
|
|
ack_done:
|
|
spin_unlock_irqrestore(&qp->s_lock, flags);
|
|
bail:
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* ipath_rc_rcv_error - process an incoming duplicate or error RC packet
|
|
* @dev: the device this packet came in on
|
|
* @ohdr: the other headers for this packet
|
|
* @data: the packet data
|
|
* @qp: the QP for this packet
|
|
* @opcode: the opcode for this packet
|
|
* @psn: the packet sequence number for this packet
|
|
* @diff: the difference between the PSN and the expected PSN
|
|
* @header_in_data: true if part of the header data is in the data buffer
|
|
*
|
|
* This is called from ipath_rc_rcv() to process an unexpected
|
|
* incoming RC packet for the given QP.
|
|
* Called at interrupt level.
|
|
* Return 1 if no more processing is needed; otherwise return 0 to
|
|
* schedule a response to be sent and the s_lock unlocked.
|
|
*/
|
|
static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
|
|
struct ipath_other_headers *ohdr,
|
|
void *data,
|
|
struct ipath_qp *qp,
|
|
u32 opcode,
|
|
u32 psn,
|
|
int diff,
|
|
int header_in_data)
|
|
{
|
|
struct ib_reth *reth;
|
|
|
|
if (diff > 0) {
|
|
/*
|
|
* Packet sequence error.
|
|
* A NAK will ACK earlier sends and RDMA writes.
|
|
* Don't queue the NAK if a RDMA read, atomic, or
|
|
* NAK is pending though.
|
|
*/
|
|
spin_lock(&qp->s_lock);
|
|
if ((qp->s_ack_state >= OP(RDMA_READ_REQUEST) &&
|
|
qp->s_ack_state != IB_OPCODE_ACKNOWLEDGE) ||
|
|
qp->s_nak_state != 0) {
|
|
spin_unlock(&qp->s_lock);
|
|
goto done;
|
|
}
|
|
qp->s_ack_state = OP(SEND_ONLY);
|
|
qp->s_nak_state = IB_NAK_PSN_ERROR;
|
|
/* Use the expected PSN. */
|
|
qp->s_ack_psn = qp->r_psn;
|
|
goto resched;
|
|
}
|
|
|
|
/*
|
|
* Handle a duplicate request. Don't re-execute SEND, RDMA
|
|
* write or atomic op. Don't NAK errors, just silently drop
|
|
* the duplicate request. Note that r_sge, r_len, and
|
|
* r_rcv_len may be in use so don't modify them.
|
|
*
|
|
* We are supposed to ACK the earliest duplicate PSN but we
|
|
* can coalesce an outstanding duplicate ACK. We have to
|
|
* send the earliest so that RDMA reads can be restarted at
|
|
* the requester's expected PSN.
|
|
*/
|
|
spin_lock(&qp->s_lock);
|
|
if (qp->s_ack_state != IB_OPCODE_ACKNOWLEDGE &&
|
|
ipath_cmp24(psn, qp->s_ack_psn) >= 0) {
|
|
if (qp->s_ack_state < IB_OPCODE_RDMA_READ_REQUEST)
|
|
qp->s_ack_psn = psn;
|
|
spin_unlock(&qp->s_lock);
|
|
goto done;
|
|
}
|
|
switch (opcode) {
|
|
case OP(RDMA_READ_REQUEST):
|
|
/*
|
|
* We have to be careful to not change s_rdma_sge
|
|
* while ipath_do_rc_send() is using it and not
|
|
* holding the s_lock.
|
|
*/
|
|
if (qp->s_ack_state != OP(ACKNOWLEDGE) &&
|
|
qp->s_ack_state >= IB_OPCODE_RDMA_READ_REQUEST) {
|
|
spin_unlock(&qp->s_lock);
|
|
dev->n_rdma_dup_busy++;
|
|
goto done;
|
|
}
|
|
/* RETH comes after BTH */
|
|
if (!header_in_data)
|
|
reth = &ohdr->u.rc.reth;
|
|
else {
|
|
reth = (struct ib_reth *)data;
|
|
data += sizeof(*reth);
|
|
}
|
|
qp->s_rdma_len = be32_to_cpu(reth->length);
|
|
if (qp->s_rdma_len != 0) {
|
|
u32 rkey = be32_to_cpu(reth->rkey);
|
|
u64 vaddr = be64_to_cpu(reth->vaddr);
|
|
int ok;
|
|
|
|
/*
|
|
* Address range must be a subset of the original
|
|
* request and start on pmtu boundaries.
|
|
*/
|
|
ok = ipath_rkey_ok(dev, &qp->s_rdma_sge,
|
|
qp->s_rdma_len, vaddr, rkey,
|
|
IB_ACCESS_REMOTE_READ);
|
|
if (unlikely(!ok))
|
|
goto done;
|
|
} else {
|
|
qp->s_rdma_sge.sg_list = NULL;
|
|
qp->s_rdma_sge.num_sge = 0;
|
|
qp->s_rdma_sge.sge.mr = NULL;
|
|
qp->s_rdma_sge.sge.vaddr = NULL;
|
|
qp->s_rdma_sge.sge.length = 0;
|
|
qp->s_rdma_sge.sge.sge_length = 0;
|
|
}
|
|
break;
|
|
|
|
case OP(COMPARE_SWAP):
|
|
case OP(FETCH_ADD):
|
|
/*
|
|
* Check for the PSN of the last atomic operation
|
|
* performed and resend the result if found.
|
|
*/
|
|
if ((psn & IPS_PSN_MASK) != qp->r_atomic_psn) {
|
|
spin_unlock(&qp->s_lock);
|
|
goto done;
|
|
}
|
|
qp->s_ack_atomic = qp->r_atomic_data;
|
|
break;
|
|
}
|
|
qp->s_ack_state = opcode;
|
|
qp->s_nak_state = 0;
|
|
qp->s_ack_psn = psn;
|
|
resched:
|
|
return 0;
|
|
|
|
done:
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* ipath_rc_rcv - process an incoming RC packet
|
|
* @dev: the device this packet came in on
|
|
* @hdr: the header of this packet
|
|
* @has_grh: true if the header has a GRH
|
|
* @data: the packet data
|
|
* @tlen: the packet length
|
|
* @qp: the QP for this packet
|
|
*
|
|
* This is called from ipath_qp_rcv() to process an incoming RC packet
|
|
* for the given QP.
|
|
* Called at interrupt level.
|
|
*/
|
|
void ipath_rc_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;
|
|
u32 opcode;
|
|
u32 hdrsize;
|
|
u32 psn;
|
|
u32 pad;
|
|
unsigned long flags;
|
|
struct ib_wc wc;
|
|
u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
|
|
int diff;
|
|
struct ib_reth *reth;
|
|
int header_in_data;
|
|
|
|
/* 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 =
|
|
ipath_layer_get_rcvhdrentsize(dev->dd) == 16;
|
|
if (header_in_data) {
|
|
psn = be32_to_cpu(((__be32 *) data)[0]);
|
|
data += sizeof(__be32);
|
|
} else
|
|
psn = be32_to_cpu(ohdr->bth[2]);
|
|
}
|
|
|
|
/*
|
|
* Process responses (ACKs) before anything else. Note that the
|
|
* packet sequence number will be for something in the send work
|
|
* queue rather than the expected receive packet sequence number.
|
|
* In other words, this QP is the requester.
|
|
*/
|
|
opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
|
|
if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
|
|
opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
|
|
ipath_rc_rcv_resp(dev, ohdr, data, tlen, qp, opcode, psn,
|
|
hdrsize, pmtu, header_in_data);
|
|
goto bail;
|
|
}
|
|
|
|
spin_lock_irqsave(&qp->r_rq.lock, flags);
|
|
|
|
/* Compute 24 bits worth of difference. */
|
|
diff = ipath_cmp24(psn, qp->r_psn);
|
|
if (unlikely(diff)) {
|
|
if (ipath_rc_rcv_error(dev, ohdr, data, qp, opcode,
|
|
psn, diff, header_in_data))
|
|
goto done;
|
|
goto resched;
|
|
}
|
|
|
|
/* 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;
|
|
nack_inv:
|
|
/*
|
|
* A NAK will ACK earlier sends and RDMA writes. Don't queue the
|
|
* NAK if a RDMA read, atomic, or NAK is pending though.
|
|
*/
|
|
spin_lock(&qp->s_lock);
|
|
if (qp->s_ack_state >= OP(RDMA_READ_REQUEST) &&
|
|
qp->s_ack_state != IB_OPCODE_ACKNOWLEDGE) {
|
|
spin_unlock(&qp->s_lock);
|
|
goto done;
|
|
}
|
|
/* XXX Flush WQEs */
|
|
qp->state = IB_QPS_ERR;
|
|
qp->s_ack_state = OP(SEND_ONLY);
|
|
qp->s_nak_state = IB_NAK_INVALID_REQUEST;
|
|
qp->s_ack_psn = qp->r_psn;
|
|
goto resched;
|
|
|
|
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 nack_inv;
|
|
|
|
case OP(RDMA_READ_REQUEST):
|
|
case OP(COMPARE_SWAP):
|
|
case OP(FETCH_ADD):
|
|
/*
|
|
* Drop all new requests until a response has been sent. A
|
|
* new request then ACKs the RDMA response we sent. Relaxed
|
|
* ordering would allow new requests to be processed but we
|
|
* would need to keep a queue of rwqe's for all that are in
|
|
* progress. Note that we can't RNR NAK this request since
|
|
* the RDMA READ or atomic response is already queued to be
|
|
* sent (unless we implement a response send queue).
|
|
*/
|
|
goto done;
|
|
|
|
default:
|
|
if (opcode == OP(SEND_MIDDLE) ||
|
|
opcode == OP(SEND_LAST) ||
|
|
opcode == OP(SEND_LAST_WITH_IMMEDIATE) ||
|
|
opcode == OP(RDMA_WRITE_MIDDLE) ||
|
|
opcode == OP(RDMA_WRITE_LAST) ||
|
|
opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
|
|
goto nack_inv;
|
|
break;
|
|
}
|
|
|
|
wc.imm_data = 0;
|
|
wc.wc_flags = 0;
|
|
|
|
/* OK, process the packet. */
|
|
switch (opcode) {
|
|
case OP(SEND_FIRST):
|
|
if (!ipath_get_rwqe(qp, 0)) {
|
|
rnr_nak:
|
|
/*
|
|
* A RNR NAK will ACK earlier sends and RDMA writes.
|
|
* Don't queue the NAK if a RDMA read or atomic
|
|
* is pending though.
|
|
*/
|
|
spin_lock(&qp->s_lock);
|
|
if (qp->s_ack_state >=
|
|
OP(RDMA_READ_REQUEST) &&
|
|
qp->s_ack_state != IB_OPCODE_ACKNOWLEDGE) {
|
|
spin_unlock(&qp->s_lock);
|
|
goto done;
|
|
}
|
|
qp->s_ack_state = OP(SEND_ONLY);
|
|
qp->s_nak_state = IB_RNR_NAK | qp->s_min_rnr_timer;
|
|
qp->s_ack_psn = qp->r_psn;
|
|
goto resched;
|
|
}
|
|
qp->r_rcv_len = 0;
|
|
/* FALLTHROUGH */
|
|
case OP(SEND_MIDDLE):
|
|
case OP(RDMA_WRITE_MIDDLE):
|
|
send_middle:
|
|
/* Check for invalid length PMTU or posted rwqe len. */
|
|
if (unlikely(tlen != (hdrsize + pmtu + 4)))
|
|
goto nack_inv;
|
|
qp->r_rcv_len += pmtu;
|
|
if (unlikely(qp->r_rcv_len > qp->r_len))
|
|
goto nack_inv;
|
|
ipath_copy_sge(&qp->r_sge, data, pmtu);
|
|
break;
|
|
|
|
case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
|
|
/* consume RWQE */
|
|
if (!ipath_get_rwqe(qp, 1))
|
|
goto rnr_nak;
|
|
goto send_last_imm;
|
|
|
|
case OP(SEND_ONLY):
|
|
case OP(SEND_ONLY_WITH_IMMEDIATE):
|
|
if (!ipath_get_rwqe(qp, 0))
|
|
goto rnr_nak;
|
|
qp->r_rcv_len = 0;
|
|
if (opcode == OP(SEND_ONLY))
|
|
goto send_last;
|
|
/* FALLTHROUGH */
|
|
case OP(SEND_LAST_WITH_IMMEDIATE):
|
|
send_last_imm:
|
|
if (header_in_data) {
|
|
wc.imm_data = *(__be32 *) data;
|
|
data += sizeof(__be32);
|
|
} else {
|
|
/* Immediate data comes after BTH */
|
|
wc.imm_data = ohdr->u.imm_data;
|
|
}
|
|
hdrsize += 4;
|
|
wc.wc_flags = IB_WC_WITH_IMM;
|
|
/* FALLTHROUGH */
|
|
case OP(SEND_LAST):
|
|
case OP(RDMA_WRITE_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 nack_inv;
|
|
/* 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 nack_inv;
|
|
ipath_copy_sge(&qp->r_sge, data, tlen);
|
|
atomic_inc(&qp->msn);
|
|
if (opcode == OP(RDMA_WRITE_LAST) ||
|
|
opcode == OP(RDMA_WRITE_ONLY))
|
|
break;
|
|
wc.wr_id = qp->r_wr_id;
|
|
wc.status = IB_WC_SUCCESS;
|
|
wc.opcode = IB_WC_RECV;
|
|
wc.vendor_err = 0;
|
|
wc.qp_num = qp->ibqp.qp_num;
|
|
wc.src_qp = qp->remote_qpn;
|
|
wc.pkey_index = 0;
|
|
wc.slid = qp->remote_ah_attr.dlid;
|
|
wc.sl = qp->remote_ah_attr.sl;
|
|
wc.dlid_path_bits = 0;
|
|
wc.port_num = 0;
|
|
/* Signal completion event if the solicited bit is set. */
|
|
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
|
|
(ohdr->bth[0] &
|
|
__constant_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 */
|
|
/* 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 & NAK */
|
|
ok = ipath_rkey_ok(dev, &qp->r_sge,
|
|
qp->r_len, vaddr, rkey,
|
|
IB_ACCESS_REMOTE_WRITE);
|
|
if (unlikely(!ok)) {
|
|
nack_acc:
|
|
/*
|
|
* A NAK will ACK earlier sends and RDMA
|
|
* writes. Don't queue the NAK if a RDMA
|
|
* read, atomic, or NAK is pending though.
|
|
*/
|
|
spin_lock(&qp->s_lock);
|
|
if (qp->s_ack_state >=
|
|
OP(RDMA_READ_REQUEST) &&
|
|
qp->s_ack_state !=
|
|
IB_OPCODE_ACKNOWLEDGE) {
|
|
spin_unlock(&qp->s_lock);
|
|
goto done;
|
|
}
|
|
/* XXX Flush WQEs */
|
|
qp->state = IB_QPS_ERR;
|
|
qp->s_ack_state = OP(RDMA_WRITE_ONLY);
|
|
qp->s_nak_state =
|
|
IB_NAK_REMOTE_ACCESS_ERROR;
|
|
qp->s_ack_psn = qp->r_psn;
|
|
goto resched;
|
|
}
|
|
} 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)))
|
|
goto nack_acc;
|
|
if (opcode == OP(RDMA_WRITE_FIRST))
|
|
goto send_middle;
|
|
else if (opcode == OP(RDMA_WRITE_ONLY))
|
|
goto send_last;
|
|
if (!ipath_get_rwqe(qp, 1))
|
|
goto rnr_nak;
|
|
goto send_last_imm;
|
|
|
|
case OP(RDMA_READ_REQUEST):
|
|
/* RETH comes after BTH */
|
|
if (!header_in_data)
|
|
reth = &ohdr->u.rc.reth;
|
|
else {
|
|
reth = (struct ib_reth *)data;
|
|
data += sizeof(*reth);
|
|
}
|
|
spin_lock(&qp->s_lock);
|
|
if (qp->s_ack_state != OP(ACKNOWLEDGE) &&
|
|
qp->s_ack_state >= IB_OPCODE_RDMA_READ_REQUEST) {
|
|
spin_unlock(&qp->s_lock);
|
|
goto done;
|
|
}
|
|
qp->s_rdma_len = be32_to_cpu(reth->length);
|
|
if (qp->s_rdma_len != 0) {
|
|
u32 rkey = be32_to_cpu(reth->rkey);
|
|
u64 vaddr = be64_to_cpu(reth->vaddr);
|
|
int ok;
|
|
|
|
/* Check rkey & NAK */
|
|
ok = ipath_rkey_ok(dev, &qp->s_rdma_sge,
|
|
qp->s_rdma_len, vaddr, rkey,
|
|
IB_ACCESS_REMOTE_READ);
|
|
if (unlikely(!ok)) {
|
|
spin_unlock(&qp->s_lock);
|
|
goto nack_acc;
|
|
}
|
|
/*
|
|
* Update the next expected PSN. We add 1 later
|
|
* below, so only add the remainder here.
|
|
*/
|
|
if (qp->s_rdma_len > pmtu)
|
|
qp->r_psn += (qp->s_rdma_len - 1) / pmtu;
|
|
} else {
|
|
qp->s_rdma_sge.sg_list = NULL;
|
|
qp->s_rdma_sge.num_sge = 0;
|
|
qp->s_rdma_sge.sge.mr = NULL;
|
|
qp->s_rdma_sge.sge.vaddr = NULL;
|
|
qp->s_rdma_sge.sge.length = 0;
|
|
qp->s_rdma_sge.sge.sge_length = 0;
|
|
}
|
|
if (unlikely(!(qp->qp_access_flags &
|
|
IB_ACCESS_REMOTE_READ)))
|
|
goto nack_acc;
|
|
/*
|
|
* We need to increment the MSN here instead of when we
|
|
* finish sending the result since a duplicate request would
|
|
* increment it more than once.
|
|
*/
|
|
atomic_inc(&qp->msn);
|
|
qp->s_ack_state = opcode;
|
|
qp->s_nak_state = 0;
|
|
qp->s_ack_psn = psn;
|
|
qp->r_psn++;
|
|
qp->r_state = opcode;
|
|
goto rdmadone;
|
|
|
|
case OP(COMPARE_SWAP):
|
|
case OP(FETCH_ADD): {
|
|
struct ib_atomic_eth *ateth;
|
|
u64 vaddr;
|
|
u64 sdata;
|
|
u32 rkey;
|
|
|
|
if (!header_in_data)
|
|
ateth = &ohdr->u.atomic_eth;
|
|
else {
|
|
ateth = (struct ib_atomic_eth *)data;
|
|
data += sizeof(*ateth);
|
|
}
|
|
vaddr = be64_to_cpu(ateth->vaddr);
|
|
if (unlikely(vaddr & (sizeof(u64) - 1)))
|
|
goto nack_inv;
|
|
rkey = be32_to_cpu(ateth->rkey);
|
|
/* Check rkey & NAK */
|
|
if (unlikely(!ipath_rkey_ok(dev, &qp->r_sge,
|
|
sizeof(u64), vaddr, rkey,
|
|
IB_ACCESS_REMOTE_ATOMIC)))
|
|
goto nack_acc;
|
|
if (unlikely(!(qp->qp_access_flags &
|
|
IB_ACCESS_REMOTE_ATOMIC)))
|
|
goto nack_acc;
|
|
/* Perform atomic OP and save result. */
|
|
sdata = be64_to_cpu(ateth->swap_data);
|
|
spin_lock(&dev->pending_lock);
|
|
qp->r_atomic_data = *(u64 *) qp->r_sge.sge.vaddr;
|
|
if (opcode == OP(FETCH_ADD))
|
|
*(u64 *) qp->r_sge.sge.vaddr =
|
|
qp->r_atomic_data + sdata;
|
|
else if (qp->r_atomic_data ==
|
|
be64_to_cpu(ateth->compare_data))
|
|
*(u64 *) qp->r_sge.sge.vaddr = sdata;
|
|
spin_unlock(&dev->pending_lock);
|
|
atomic_inc(&qp->msn);
|
|
qp->r_atomic_psn = psn & IPS_PSN_MASK;
|
|
psn |= 1 << 31;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
/* Drop packet for unknown opcodes. */
|
|
goto done;
|
|
}
|
|
qp->r_psn++;
|
|
qp->r_state = opcode;
|
|
/* Send an ACK if requested or required. */
|
|
if (psn & (1 << 31)) {
|
|
/*
|
|
* Coalesce ACKs unless there is a RDMA READ or
|
|
* ATOMIC pending.
|
|
*/
|
|
spin_lock(&qp->s_lock);
|
|
if (qp->s_ack_state == OP(ACKNOWLEDGE) ||
|
|
qp->s_ack_state < IB_OPCODE_RDMA_READ_REQUEST) {
|
|
qp->s_ack_state = opcode;
|
|
qp->s_nak_state = 0;
|
|
qp->s_ack_psn = psn;
|
|
qp->s_ack_atomic = qp->r_atomic_data;
|
|
goto resched;
|
|
}
|
|
spin_unlock(&qp->s_lock);
|
|
}
|
|
done:
|
|
spin_unlock_irqrestore(&qp->r_rq.lock, flags);
|
|
goto bail;
|
|
|
|
resched:
|
|
/*
|
|
* Try to send ACK right away but not if ipath_do_rc_send() is
|
|
* active.
|
|
*/
|
|
if (qp->s_hdrwords == 0 &&
|
|
(qp->s_ack_state < IB_OPCODE_RDMA_READ_REQUEST ||
|
|
qp->s_ack_state >= IB_OPCODE_COMPARE_SWAP))
|
|
send_rc_ack(qp);
|
|
|
|
rdmadone:
|
|
spin_unlock(&qp->s_lock);
|
|
spin_unlock_irqrestore(&qp->r_rq.lock, flags);
|
|
|
|
/* Call ipath_do_rc_send() in another thread. */
|
|
tasklet_hi_schedule(&qp->s_task);
|
|
|
|
bail:
|
|
return;
|
|
}
|