Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932212AbWEMABn (ORCPT ); Fri, 12 May 2006 20:01:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932284AbWELX5T (ORCPT ); Fri, 12 May 2006 19:57:19 -0400 Received: from mx.pathscale.com ([64.160.42.68]:56233 "EHLO mx.pathscale.com") by vger.kernel.org with ESMTP id S932212AbWELXoe (ORCPT ); Fri, 12 May 2006 19:44:34 -0400 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [PATCH 20 of 53] ipath - more sharing between RC and UC code X-Mercurial-Node: 201654fe19625588a57447ab783dc291a9b9ec4d Message-Id: <201654fe19625588a574.1147477385@eng-12.pathscale.com> In-Reply-To: Date: Fri, 12 May 2006 16:43:05 -0700 From: "Bryan O'Sullivan" To: rdreier@cisco.com Cc: openib-general@openib.org, linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 47331 Lines: 1563 Share more common code between RC and UC protocols. Signed-off-by: Bryan O'Sullivan diff -r 947e92f4b370 -r 201654fe1962 drivers/infiniband/hw/ipath/ipath_qp.c --- a/drivers/infiniband/hw/ipath/ipath_qp.c Fri May 12 15:55:28 2006 -0700 +++ b/drivers/infiniband/hw/ipath/ipath_qp.c Fri May 12 15:55:28 2006 -0700 @@ -718,9 +718,7 @@ struct ib_qp *ipath_create_qp(struct ib_ spin_lock_init(&qp->r_rq.lock); atomic_set(&qp->refcount, 0); init_waitqueue_head(&qp->wait); - tasklet_init(&qp->s_task, - init_attr->qp_type == IB_QPT_RC ? - ipath_do_rc_send : ipath_do_uc_send, + tasklet_init(&qp->s_task, ipath_do_ruc_send, (unsigned long)qp); INIT_LIST_HEAD(&qp->piowait); INIT_LIST_HEAD(&qp->timerwait); @@ -905,9 +903,9 @@ void ipath_get_credit(struct ipath_qp *q * as many packets as we like. Otherwise, we have to * honor the credit field. */ - if (credit == IPS_AETH_CREDIT_INVAL) { + if (credit == IPS_AETH_CREDIT_INVAL) qp->s_lsn = (u32) -1; - } else if (qp->s_lsn != (u32) -1) { + else if (qp->s_lsn != (u32) -1) { /* Compute new LSN (i.e., MSN + credit) */ credit = (aeth + credit_table[credit]) & IPS_MSN_MASK; if (ipath_cmp24(credit, qp->s_lsn) > 0) diff -r 947e92f4b370 -r 201654fe1962 drivers/infiniband/hw/ipath/ipath_rc.c --- a/drivers/infiniband/hw/ipath/ipath_rc.c Fri May 12 15:55:28 2006 -0700 +++ b/drivers/infiniband/hw/ipath/ipath_rc.c Fri May 12 15:55:28 2006 -0700 @@ -72,9 +72,9 @@ static void ipath_init_restart(struct ip * Return bth0 if constructed; otherwise, return 0. * Note the QP s_lock must be held. */ -static inline u32 ipath_make_rc_ack(struct ipath_qp *qp, - struct ipath_other_headers *ohdr, - u32 pmtu) +u32 ipath_make_rc_ack(struct ipath_qp *qp, + struct ipath_other_headers *ohdr, + u32 pmtu) { struct ipath_sge_state *ss; u32 hwords; @@ -95,8 +95,7 @@ static inline u32 ipath_make_rc_ack(stru if (len > pmtu) { len = pmtu; qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); - } - else + } else qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); qp->s_rdma_len -= len; bth0 = qp->s_ack_state << 24; @@ -135,7 +134,8 @@ static inline u32 ipath_make_rc_ack(stru */ qp->r_state = OP(RDMA_READ_RESPONSE_LAST); qp->s_ack_state = OP(ACKNOWLEDGE); - return 0; + bth0 = 0; + goto bail; case OP(COMPARE_SWAP): case OP(FETCH_ADD): @@ -143,7 +143,7 @@ static inline u32 ipath_make_rc_ack(stru len = 0; qp->r_state = OP(SEND_LAST); qp->s_ack_state = OP(ACKNOWLEDGE); - bth0 = IB_OPCODE_ATOMIC_ACKNOWLEDGE << 24; + bth0 = OP(ATOMIC_ACKNOWLEDGE) << 24; ohdr->u.at.aeth = ipath_compute_aeth(qp); ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->s_ack_atomic); hwords += sizeof(ohdr->u.at) / 4; @@ -162,6 +162,7 @@ static inline u32 ipath_make_rc_ack(stru qp->s_cur_sge = ss; qp->s_cur_size = len; +bail: return bth0; } @@ -176,9 +177,9 @@ static inline u32 ipath_make_rc_ack(stru * Return 1 if constructed; otherwise, return 0. * Note the QP s_lock must be held. */ -static inline int ipath_make_rc_req(struct ipath_qp *qp, - struct ipath_other_headers *ohdr, - u32 pmtu, u32 *bth0p, u32 *bth2p) +int ipath_make_rc_req(struct ipath_qp *qp, + struct ipath_other_headers *ohdr, + u32 pmtu, u32 *bth0p, u32 *bth2p) { struct ipath_ibdev *dev = to_idev(qp->ibqp.device); struct ipath_sge_state *ss; @@ -257,7 +258,7 @@ static inline int ipath_make_rc_req(stru break; case IB_WR_RDMA_WRITE: - if (newreq) + if (newreq && qp->s_lsn != (u32) -1) qp->s_lsn++; /* FALLTHROUGH */ case IB_WR_RDMA_WRITE_WITH_IMM: @@ -283,8 +284,7 @@ static inline int ipath_make_rc_req(stru else { qp->s_state = OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); - /* Immediate data comes - * after RETH */ + /* Immediate data comes after RETH */ ohdr->u.rc.imm_data = wqe->wr.imm_data; hwords += 1; if (wqe->wr.send_flags & IB_SEND_SOLICITED) @@ -304,7 +304,8 @@ static inline int ipath_make_rc_req(stru qp->s_state = OP(RDMA_READ_REQUEST); hwords += sizeof(ohdr->u.rc.reth) / 4; if (newreq) { - qp->s_lsn++; + if (qp->s_lsn != (u32) -1) + qp->s_lsn++; /* * Adjust s_next_psn to count the * expected number of responses. @@ -335,7 +336,8 @@ static inline int ipath_make_rc_req(stru wqe->wr.wr.atomic.compare_add); hwords += sizeof(struct ib_atomic_eth) / 4; if (newreq) { - qp->s_lsn++; + if (qp->s_lsn != (u32) -1) + qp->s_lsn++; wqe->lpsn = wqe->psn; } if (++qp->s_cur == qp->s_size) @@ -355,6 +357,11 @@ static inline int ipath_make_rc_req(stru bth2 |= qp->s_psn++ & IPS_PSN_MASK; if ((int)(qp->s_psn - qp->s_next_psn) > 0) qp->s_next_psn = qp->s_psn; + /* + * Put the QP on the pending list so lost ACKs will cause + * a retry. More than one request can be pending so the + * QP may already be on the dev->pending list. + */ spin_lock(&dev->pending_lock); if (list_empty(&qp->timerwait)) list_add_tail(&qp->timerwait, @@ -364,8 +371,8 @@ static inline int ipath_make_rc_req(stru case OP(RDMA_READ_RESPONSE_FIRST): /* - * This case can only happen if a send is restarted. See - * ipath_restart_rc(). + * This case can only happen if a send is restarted. + * See ipath_restart_rc(). */ ipath_init_restart(qp, wqe); /* FALLTHROUGH */ @@ -496,176 +503,48 @@ done: return 0; } -static inline void ipath_make_rc_grh(struct ipath_qp *qp, - struct ib_global_route *grh, - u32 nwords) -{ - struct ipath_ibdev *dev = to_idev(qp->ibqp.device); - - /* GRH header size in 32-bit words. */ - qp->s_hdrwords += 10; - qp->s_hdr.u.l.grh.version_tclass_flow = - cpu_to_be32((6 << 28) | - (grh->traffic_class << 20) | - grh->flow_label); - qp->s_hdr.u.l.grh.paylen = - cpu_to_be16(((qp->s_hdrwords - 12) + nwords + - SIZE_OF_CRC) << 2); - /* next_hdr is defined by C8-7 in ch. 8.4.1 */ - qp->s_hdr.u.l.grh.next_hdr = 0x1B; - qp->s_hdr.u.l.grh.hop_limit = grh->hop_limit; - /* The SGID is 32-bit aligned. */ - qp->s_hdr.u.l.grh.sgid.global.subnet_prefix = dev->gid_prefix; - qp->s_hdr.u.l.grh.sgid.global.interface_id = - ipath_layer_get_guid(dev->dd); - qp->s_hdr.u.l.grh.dgid = grh->dgid; -} - /** - * ipath_do_rc_send - perform a send on an RC QP - * @data: contains a pointer to the QP + * send_rc_ack - Construct an ACK packet and send it + * @qp: a pointer to the QP * - * Process entries in the send work queue until credit or queue is - * exhausted. Only allow one CPU to send a packet per QP (tasklet). - * Otherwise, after we drop the QP s_lock, two threads could send - * packets out of order. + * 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. */ -void ipath_do_rc_send(unsigned long data) -{ - struct ipath_qp *qp = (struct ipath_qp *)data; - struct ipath_ibdev *dev = to_idev(qp->ibqp.device); - unsigned long flags; - u16 lrh0; - u32 nwords; - u32 extra_bytes; - u32 bth0; - u32 bth2; - u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); - struct ipath_other_headers *ohdr; - - if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags)) - goto bail; - - if (unlikely(qp->remote_ah_attr.dlid == - ipath_layer_get_lid(dev->dd))) { - struct ib_wc wc; - - /* - * Pass in an uninitialized ib_wc to be consistent with - * other places where ipath_ruc_loopback() is called. - */ - ipath_ruc_loopback(qp, &wc); - goto clear; - } - - ohdr = &qp->s_hdr.u.oth; - if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) - ohdr = &qp->s_hdr.u.l.oth; - -again: - /* Check for a constructed packet to be sent. */ - if (qp->s_hdrwords != 0) { - /* - * If no PIO bufs are available, return. An interrupt will - * call ipath_ib_piobufavail() when one is available. - */ - _VERBS_INFO("h %u %p\n", qp->s_hdrwords, &qp->s_hdr); - _VERBS_INFO("d %u %p %u %p %u %u %u %u\n", qp->s_cur_size, - qp->s_cur_sge->sg_list, - qp->s_cur_sge->num_sge, - qp->s_cur_sge->sge.vaddr, - qp->s_cur_sge->sge.sge_length, - qp->s_cur_sge->sge.length, - qp->s_cur_sge->sge.m, - qp->s_cur_sge->sge.n); - if (ipath_verbs_send(dev->dd, qp->s_hdrwords, - (u32 *) &qp->s_hdr, qp->s_cur_size, - qp->s_cur_sge)) { - ipath_no_bufs_available(qp, dev); - goto bail; - } - dev->n_unicast_xmit++; - /* Record that we sent the packet and s_hdr is empty. */ - qp->s_hdrwords = 0; - } - - /* - * The lock is needed to synchronize between setting - * qp->s_ack_state, resend timer, and post_send(). - */ - spin_lock_irqsave(&qp->s_lock, flags); - - /* Sending responses has higher priority over sending requests. */ - if (qp->s_ack_state != OP(ACKNOWLEDGE) && - (bth0 = ipath_make_rc_ack(qp, ohdr, pmtu)) != 0) - bth2 = qp->s_ack_psn++ & IPS_PSN_MASK; - else if (!ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2)) - goto done; - - spin_unlock_irqrestore(&qp->s_lock, flags); - - /* Construct the header. */ - extra_bytes = (4 - qp->s_cur_size) & 3; - nwords = (qp->s_cur_size + extra_bytes) >> 2; - lrh0 = IPS_LRH_BTH; - if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { - ipath_make_rc_grh(qp, &qp->remote_ah_attr.grh, nwords); - lrh0 = IPS_LRH_GRH; - } - lrh0 |= qp->remote_ah_attr.sl << 4; - qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); - qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); - qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + - SIZE_OF_CRC); - qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd)); - bth0 |= ipath_layer_get_pkey(dev->dd, qp->s_pkey_index); - bth0 |= extra_bytes << 20; - ohdr->bth[0] = cpu_to_be32(bth0); - ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); - ohdr->bth[2] = cpu_to_be32(bth2); - - /* Check for more work to do. */ - goto again; - -done: - spin_unlock_irqrestore(&qp->s_lock, flags); -clear: - clear_bit(IPATH_S_BUSY, &qp->s_flags); -bail: - return; -} - 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 = &qp->s_hdr.u.oth; + ohdr = &hdr.u.oth; lrh0 = IPS_LRH_BTH; /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */ - qp->s_hdrwords = 6; + hwords = 6; if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { - ipath_make_rc_grh(qp, &qp->remote_ah_attr.grh, 0); - ohdr = &qp->s_hdr.u.l.oth; + 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; + bth0 |= OP(ATOMIC_ACKNOWLEDGE) << 24; ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->s_ack_atomic); - qp->s_hdrwords += sizeof(ohdr->u.at.atomic_ack_eth) / 4; - } - else + hwords += sizeof(ohdr->u.at.atomic_ack_eth) / 4; + } else bth0 |= OP(ACKNOWLEDGE) << 24; lrh0 |= qp->remote_ah_attr.sl << 4; - qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); - qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); - qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + SIZE_OF_CRC); - qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd)); + 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); @@ -673,12 +552,93 @@ static void send_rc_ack(struct ipath_qp /* * If we can send the ACK, clear the ACK state. */ - if (ipath_verbs_send(dev->dd, qp->s_hdrwords, (u32 *) &qp->s_hdr, - 0, NULL) == 0) { + if (ipath_verbs_send(dev->dd, hwords, (u32 *) &hdr, 0, NULL) == 0) { qp->s_ack_state = OP(ACKNOWLEDGE); + dev->n_unicast_xmit++; + } else 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; } /** @@ -693,7 +653,6 @@ void ipath_restart_rc(struct ipath_qp *q { struct ipath_swqe *wqe = get_swqe_ptr(qp, qp->s_last); struct ipath_ibdev *dev; - u32 n; /* * If there are no requests pending, we are done. @@ -735,130 +694,13 @@ void ipath_restart_rc(struct ipath_qp *q else dev->n_rc_resends += (int)qp->s_psn - (int)psn; - /* - * If we are starting the request from the beginning, let the normal - * send code handle initialization. - */ - qp->s_cur = qp->s_last; - if (ipath_cmp24(psn, wqe->psn) <= 0) { - qp->s_state = OP(SEND_LAST); - qp->s_psn = wqe->psn; - } else { - n = qp->s_cur; - for (;;) { - if (++n == qp->s_size) - n = 0; - if (n == qp->s_tail) { - if (ipath_cmp24(psn, qp->s_next_psn) >= 0) { - qp->s_cur = n; - wqe = get_swqe_ptr(qp, n); - } - break; - } - wqe = get_swqe_ptr(qp, n); - if (ipath_cmp24(psn, wqe->psn) < 0) - break; - qp->s_cur = n; - } - qp->s_psn = psn; - - /* - * Reset 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 (wqe->wr.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); - } - } + reset_psn(qp, psn); done: tasklet_hi_schedule(&qp->s_task); bail: return; -} - -/** - * 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) -{ - struct ipath_swqe *wqe; - u32 n; - - n = qp->s_cur; - wqe = get_swqe_ptr(qp, n); - for (;;) { - if (++n == qp->s_size) - n = 0; - if (n == qp->s_tail) { - if (ipath_cmp24(psn, qp->s_next_psn) >= 0) { - qp->s_cur = n; - wqe = get_swqe_ptr(qp, n); - } - break; - } - wqe = get_swqe_ptr(qp, n); - if (ipath_cmp24(psn, wqe->psn) < 0) - break; - qp->s_cur = n; - } - qp->s_psn = psn; - - /* - * 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 (wqe->wr.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); - } } /** @@ -867,7 +709,7 @@ static void reset_psn(struct ipath_qp *q * @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() to process an incoming RC 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). @@ -1011,17 +853,7 @@ static int do_rc_ack(struct ipath_qp *qp dev->n_rc_resends += (int)qp->s_psn - (int)psn; - /* - * If we are starting the request from the beginning, let - * the normal send code handle initialization. - */ - qp->s_cur = qp->s_last; - wqe = get_swqe_ptr(qp, qp->s_cur); - if (ipath_cmp24(psn, wqe->psn) <= 0) { - qp->s_state = OP(SEND_LAST); - qp->s_psn = wqe->psn; - } else - reset_psn(qp, psn); + reset_psn(qp, psn); qp->s_rnr_timeout = ib_ipath_rnr_table[(aeth >> IPS_AETH_CREDIT_SHIFT) & @@ -1182,32 +1014,33 @@ static inline void ipath_rc_rcv_resp(str 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; + 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. */ @@ -1230,18 +1063,12 @@ static inline void ipath_rc_rcv_resp(str * ICRC (4). */ if (unlikely(tlen <= (hdrsize + pad + 8))) { - /* - * XXX Need to generate an error CQ - * entry. - */ + /* 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. - */ + /* XXX Need to generate an error CQ entry. */ goto ack_done; } if (!header_in_data) @@ -1254,9 +1081,12 @@ static inline void ipath_rc_rcv_resp(str if (do_rc_ack(qp, aeth, psn, OP(RDMA_READ_RESPONSE_LAST))) { /* * Change the state so we contimue - * processing new requests. + * 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; } @@ -1295,6 +1125,8 @@ static inline int ipath_rc_rcv_error(str { struct ib_reth *reth; + spin_lock(&qp->s_lock); + if (diff > 0) { /* * Packet sequence error. @@ -1302,13 +1134,10 @@ static inline int ipath_rc_rcv_error(str * 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); + qp->s_ack_state != OP(ACKNOWLEDGE)) || + qp->s_nak_state != 0) goto done; - } qp->s_ack_state = OP(SEND_ONLY); qp->s_nak_state = IB_NAK_PSN_ERROR; /* Use the expected PSN. */ @@ -1327,12 +1156,10 @@ static inline int ipath_rc_rcv_error(str * 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 && + if (qp->s_ack_state != OP(ACKNOWLEDGE) && ipath_cmp24(psn, qp->s_ack_psn) >= 0) { - if (qp->s_ack_state < IB_OPCODE_RDMA_READ_REQUEST) + if (qp->s_ack_state < OP(RDMA_READ_REQUEST)) qp->s_ack_psn = psn; - spin_unlock(&qp->s_lock); goto done; } switch (opcode) { @@ -1343,8 +1170,7 @@ static inline int ipath_rc_rcv_error(str * 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); + qp->s_ack_state >= OP(RDMA_READ_REQUEST)) { dev->n_rdma_dup_busy++; goto done; } @@ -1383,13 +1209,11 @@ static inline int ipath_rc_rcv_error(str case OP(COMPARE_SWAP): case OP(FETCH_ADD): /* - * Check for the PSN of the last atomic operations + * 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); + if ((psn & IPS_PSN_MASK) != qp->r_atomic_psn) goto done; - } qp->s_ack_atomic = qp->r_atomic_data; break; } @@ -1400,6 +1224,7 @@ resched: return 0; done: + spin_unlock(&qp->s_lock); return 1; } @@ -1453,11 +1278,6 @@ void ipath_rc_rcv(struct ipath_ibdev *de } 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; /* * Process responses (ACKs) before anything else. Note that the @@ -1465,6 +1285,7 @@ void ipath_rc_rcv(struct ipath_ibdev *de * 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, @@ -1492,22 +1313,23 @@ void ipath_rc_rcv(struct ipath_ibdev *de 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; + /* + * 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 != OP(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): @@ -1556,9 +1378,8 @@ void ipath_rc_rcv(struct ipath_ibdev *de * is pending though. */ spin_lock(&qp->s_lock); - if (qp->s_ack_state >= - OP(RDMA_READ_REQUEST) && - qp->s_ack_state != IB_OPCODE_ACKNOWLEDGE) { + if (qp->s_ack_state >= OP(RDMA_READ_REQUEST) && + qp->s_ack_state != OP(ACKNOWLEDGE)) { spin_unlock(&qp->s_lock); goto done; } @@ -1674,10 +1495,10 @@ void ipath_rc_rcv(struct ipath_ibdev *de * read, atomic, or NAK is pending though. */ spin_lock(&qp->s_lock); + nack_acc1: if (qp->s_ack_state >= OP(RDMA_READ_REQUEST) && - qp->s_ack_state != - IB_OPCODE_ACKNOWLEDGE) { + qp->s_ack_state != OP(ACKNOWLEDGE)) { spin_unlock(&qp->s_lock); goto done; } @@ -1715,9 +1536,16 @@ void ipath_rc_rcv(struct ipath_ibdev *de reth = (struct ib_reth *)data; data += sizeof(*reth); } + if (unlikely(!(qp->qp_access_flags & + IB_ACCESS_REMOTE_READ))) + goto nack_acc; + /* + * Ignore request if we already have an + * 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 >= OP(RDMA_READ_REQUEST)) { spin_unlock(&qp->s_lock); goto done; } @@ -1731,10 +1559,8 @@ void ipath_rc_rcv(struct ipath_ibdev *de 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; - } + if (unlikely(!ok)) + goto nack_acc1; /* * Update the next expected PSN. We add 1 later * below, so only add the remainder here. @@ -1749,9 +1575,6 @@ void ipath_rc_rcv(struct ipath_ibdev *de 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 @@ -1821,7 +1644,7 @@ void ipath_rc_rcv(struct ipath_ibdev *de */ 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 < OP(RDMA_READ_REQUEST)) { qp->s_ack_state = opcode; qp->s_nak_state = 0; qp->s_ack_psn = psn; @@ -1843,6 +1666,8 @@ resched: (qp->s_ack_state < IB_OPCODE_RDMA_READ_REQUEST || qp->s_ack_state >= IB_OPCODE_COMPARE_SWAP)) send_rc_ack(qp); + else + dev->n_rc_qacks++; rdmadone: spin_unlock(&qp->s_lock); diff -r 947e92f4b370 -r 201654fe1962 drivers/infiniband/hw/ipath/ipath_ruc.c --- a/drivers/infiniband/hw/ipath/ipath_ruc.c Fri May 12 15:55:28 2006 -0700 +++ b/drivers/infiniband/hw/ipath/ipath_ruc.c Fri May 12 15:55:28 2006 -0700 @@ -31,6 +31,7 @@ */ #include "ipath_verbs.h" +#include "ips_common.h" /* * Convert the AETH RNR timeout code into the number of milliseconds. @@ -187,7 +188,6 @@ bail: /** * ipath_ruc_loopback - handle UC and RC lookback requests * @sqp: the loopback QP - * @wc: the work completion entry * * This is called from ipath_do_uc_send() or ipath_do_rc_send() to * forward a WQE addressed to the same HCA. @@ -196,13 +196,14 @@ bail: * receive interrupts since this is a connected protocol and all packets * will pass through here. */ -void ipath_ruc_loopback(struct ipath_qp *sqp, struct ib_wc *wc) +static void ipath_ruc_loopback(struct ipath_qp *sqp) { struct ipath_ibdev *dev = to_idev(sqp->ibqp.device); struct ipath_qp *qp; struct ipath_swqe *wqe; struct ipath_sge *sge; unsigned long flags; + struct ib_wc wc; u64 sdata; qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn); @@ -233,8 +234,8 @@ again: wqe = get_swqe_ptr(sqp, sqp->s_last); spin_unlock_irqrestore(&sqp->s_lock, flags); - wc->wc_flags = 0; - wc->imm_data = 0; + wc.wc_flags = 0; + wc.imm_data = 0; sqp->s_sge.sge = wqe->sg_list[0]; sqp->s_sge.sg_list = wqe->sg_list + 1; @@ -242,8 +243,8 @@ again: sqp->s_len = wqe->length; switch (wqe->wr.opcode) { case IB_WR_SEND_WITH_IMM: - wc->wc_flags = IB_WC_WITH_IMM; - wc->imm_data = wqe->wr.imm_data; + wc.wc_flags = IB_WC_WITH_IMM; + wc.imm_data = wqe->wr.imm_data; /* FALLTHROUGH */ case IB_WR_SEND: spin_lock_irqsave(&qp->r_rq.lock, flags); @@ -254,7 +255,7 @@ again: if (qp->ibqp.qp_type == IB_QPT_UC) goto send_comp; if (sqp->s_rnr_retry == 0) { - wc->status = IB_WC_RNR_RETRY_EXC_ERR; + wc.status = IB_WC_RNR_RETRY_EXC_ERR; goto err; } if (sqp->s_rnr_retry_cnt < 7) @@ -269,8 +270,8 @@ again: break; case IB_WR_RDMA_WRITE_WITH_IMM: - wc->wc_flags = IB_WC_WITH_IMM; - wc->imm_data = wqe->wr.imm_data; + wc.wc_flags = IB_WC_WITH_IMM; + wc.imm_data = wqe->wr.imm_data; spin_lock_irqsave(&qp->r_rq.lock, flags); if (!ipath_get_rwqe(qp, 1)) goto rnr_nak; @@ -284,20 +285,20 @@ again: wqe->wr.wr.rdma.rkey, IB_ACCESS_REMOTE_WRITE))) { acc_err: - wc->status = IB_WC_REM_ACCESS_ERR; + wc.status = IB_WC_REM_ACCESS_ERR; err: - 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 = sqp->ibqp.qp_num; - wc->src_qp = sqp->remote_qpn; - wc->pkey_index = 0; - wc->slid = sqp->remote_ah_attr.dlid; - wc->sl = sqp->remote_ah_attr.sl; - wc->dlid_path_bits = 0; - wc->port_num = 0; - ipath_sqerror_qp(sqp, wc); + 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 = sqp->ibqp.qp_num; + wc.src_qp = sqp->remote_qpn; + wc.pkey_index = 0; + wc.slid = sqp->remote_ah_attr.dlid; + wc.sl = sqp->remote_ah_attr.sl; + wc.dlid_path_bits = 0; + wc.port_num = 0; + ipath_sqerror_qp(sqp, &wc); goto done; } break; @@ -373,22 +374,22 @@ again: goto send_comp; if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) - wc->opcode = IB_WC_RECV_RDMA_WITH_IMM; + wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; else - wc->opcode = IB_WC_RECV; - wc->wr_id = qp->r_wr_id; - wc->status = IB_WC_SUCCESS; - wc->vendor_err = 0; - wc->byte_len = wqe->length; - wc->qp_num = qp->ibqp.qp_num; - wc->src_qp = qp->remote_qpn; + wc.opcode = IB_WC_RECV; + wc.wr_id = qp->r_wr_id; + wc.status = IB_WC_SUCCESS; + wc.vendor_err = 0; + wc.byte_len = wqe->length; + wc.qp_num = qp->ibqp.qp_num; + wc.src_qp = qp->remote_qpn; /* XXX do we know which pkey matched? Only needed for GSI. */ - wc->pkey_index = 0; - wc->slid = qp->remote_ah_attr.dlid; - wc->sl = qp->remote_ah_attr.sl; - wc->dlid_path_bits = 0; + wc.pkey_index = 0; + wc.slid = qp->remote_ah_attr.dlid; + wc.sl = qp->remote_ah_attr.sl; + wc.dlid_path_bits = 0; /* Signal completion event if the solicited bit is set. */ - ipath_cq_enter(to_icq(qp->ibqp.recv_cq), wc, + ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, wqe->wr.send_flags & IB_SEND_SOLICITED); send_comp: @@ -396,19 +397,19 @@ send_comp: if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &sqp->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 = sqp->ibqp.qp_num; - wc->src_qp = 0; - wc->pkey_index = 0; - wc->slid = 0; - wc->sl = 0; - wc->dlid_path_bits = 0; - wc->port_num = 0; - ipath_cq_enter(to_icq(sqp->ibqp.send_cq), wc, 0); + 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 = sqp->ibqp.qp_num; + wc.src_qp = 0; + wc.pkey_index = 0; + wc.slid = 0; + wc.sl = 0; + wc.dlid_path_bits = 0; + wc.port_num = 0; + ipath_cq_enter(to_icq(sqp->ibqp.send_cq), &wc, 0); } /* Update s_last now that we are finished with the SWQE */ @@ -454,11 +455,11 @@ void ipath_no_bufs_available(struct ipat } /** - * ipath_post_rc_send - post RC and UC sends + * ipath_post_ruc_send - post RC and UC sends * @qp: the QP to post on * @wr: the work request to send */ -int ipath_post_rc_send(struct ipath_qp *qp, struct ib_send_wr *wr) +int ipath_post_ruc_send(struct ipath_qp *qp, struct ib_send_wr *wr) { struct ipath_swqe *wqe; unsigned long flags; @@ -533,13 +534,149 @@ int ipath_post_rc_send(struct ipath_qp * qp->s_head = next; spin_unlock_irqrestore(&qp->s_lock, flags); - if (qp->ibqp.qp_type == IB_QPT_UC) - ipath_do_uc_send((unsigned long) qp); - else - ipath_do_rc_send((unsigned long) qp); + ipath_do_ruc_send((unsigned long) qp); ret = 0; bail: return ret; } + +/** + * ipath_make_grh - construct a GRH header + * @dev: a pointer to the ipath device + * @hdr: a pointer to the GRH header being constructed + * @grh: the global route address to send to + * @hwords: the number of 32 bit words of header being sent + * @nwords: the number of 32 bit words of data being sent + * + * Return the size of the header in 32 bit words. + */ +u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr, + struct ib_global_route *grh, u32 hwords, u32 nwords) +{ + hdr->version_tclass_flow = + cpu_to_be32((6 << 28) | + (grh->traffic_class << 20) | + grh->flow_label); + hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); + /* next_hdr is defined by C8-7 in ch. 8.4.1 */ + hdr->next_hdr = 0x1B; + hdr->hop_limit = grh->hop_limit; + /* The SGID is 32-bit aligned. */ + hdr->sgid.global.subnet_prefix = dev->gid_prefix; + hdr->sgid.global.interface_id = ipath_layer_get_guid(dev->dd); + hdr->dgid = grh->dgid; + + /* GRH header size in 32-bit words. */ + return sizeof(struct ib_grh) / sizeof(u32); +} + +/** + * ipath_do_ruc_send - perform a send on an RC or UC QP + * @data: contains a pointer to the QP + * + * Process entries in the send work queue until credit or queue is + * exhausted. Only allow one CPU to send a packet per QP (tasklet). + * Otherwise, after we drop the QP s_lock, two threads could send + * packets out of order. + */ +void ipath_do_ruc_send(unsigned long data) +{ + struct ipath_qp *qp = (struct ipath_qp *)data; + struct ipath_ibdev *dev = to_idev(qp->ibqp.device); + unsigned long flags; + u16 lrh0; + u32 nwords; + u32 extra_bytes; + u32 bth0; + u32 bth2; + u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); + struct ipath_other_headers *ohdr; + + if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags)) + goto bail; + + if (unlikely(qp->remote_ah_attr.dlid == + ipath_layer_get_lid(dev->dd))) { + ipath_ruc_loopback(qp); + goto clear; + } + + ohdr = &qp->s_hdr.u.oth; + if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) + ohdr = &qp->s_hdr.u.l.oth; + +again: + /* Check for a constructed packet to be sent. */ + if (qp->s_hdrwords != 0) { + /* + * If no PIO bufs are available, return. An interrupt will + * call ipath_ib_piobufavail() when one is available. + */ + if (ipath_verbs_send(dev->dd, qp->s_hdrwords, + (u32 *) &qp->s_hdr, qp->s_cur_size, + qp->s_cur_sge)) { + ipath_no_bufs_available(qp, dev); + goto bail; + } + dev->n_unicast_xmit++; + /* Record that we sent the packet and s_hdr is empty. */ + qp->s_hdrwords = 0; + } + + /* + * The lock is needed to synchronize between setting + * qp->s_ack_state, resend timer, and post_send(). + */ + spin_lock_irqsave(&qp->s_lock, flags); + + /* Sending responses has higher priority over sending requests. */ + if (qp->s_ack_state != IB_OPCODE_RC_ACKNOWLEDGE && + (bth0 = ipath_make_rc_ack(qp, ohdr, pmtu)) != 0) + bth2 = qp->s_ack_psn++ & IPS_PSN_MASK; + else if (!((qp->ibqp.qp_type == IB_QPT_RC) ? + ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2) : + ipath_make_uc_req(qp, ohdr, pmtu, &bth0, &bth2))) { + /* + * Clear the busy bit before unlocking to avoid races with + * adding new work queue items and then failing to process + * them. + */ + clear_bit(IPATH_S_BUSY, &qp->s_flags); + spin_unlock_irqrestore(&qp->s_lock, flags); + goto bail; + } + + spin_unlock_irqrestore(&qp->s_lock, flags); + + /* Construct the header. */ + extra_bytes = (4 - qp->s_cur_size) & 3; + nwords = (qp->s_cur_size + extra_bytes) >> 2; + lrh0 = IPS_LRH_BTH; + if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { + qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh, + &qp->remote_ah_attr.grh, + qp->s_hdrwords, nwords); + lrh0 = IPS_LRH_GRH; + } + lrh0 |= qp->remote_ah_attr.sl << 4; + qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); + qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); + qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + + SIZE_OF_CRC); + qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd)); + bth0 |= ipath_layer_get_pkey(dev->dd, qp->s_pkey_index); + bth0 |= extra_bytes << 20; + ohdr->bth[0] = cpu_to_be32(bth0); + ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); + ohdr->bth[2] = cpu_to_be32(bth2); + + /* Check for more work to do. */ + goto again; + +clear: + clear_bit(IPATH_S_BUSY, &qp->s_flags); +bail: + return; +} diff -r 947e92f4b370 -r 201654fe1962 drivers/infiniband/hw/ipath/ipath_uc.c --- a/drivers/infiniband/hw/ipath/ipath_uc.c Fri May 12 15:55:28 2006 -0700 +++ b/drivers/infiniband/hw/ipath/ipath_uc.c Fri May 12 15:55:28 2006 -0700 @@ -61,90 +61,40 @@ static void complete_last_send(struct ip } /** - * ipath_do_uc_send - do a send on a UC queue - * @data: contains a pointer to the QP to send on - * - * Process entries in the send work queue until the queue is exhausted. - * Only allow one CPU to send a packet per QP (tasklet). - * Otherwise, after we drop the QP lock, two threads could send - * packets out of order. - * This is similar to ipath_do_rc_send() below except we don't have - * timeouts or resends. + * ipath_make_uc_req - construct a request packet (SEND, RDMA write) + * @qp: a pointer to the QP + * @ohdr: a pointer to the IB header being constructed + * @pmtu: the path MTU + * @bth0p: pointer to the BTH opcode word + * @bth2p: pointer to the BTH PSN word + * + * Return 1 if constructed; otherwise, return 0. + * Note the QP s_lock must be held and interrupts disabled. */ -void ipath_do_uc_send(unsigned long data) +int ipath_make_uc_req(struct ipath_qp *qp, + struct ipath_other_headers *ohdr, + u32 pmtu, u32 *bth0p, u32 *bth2p) { - struct ipath_qp *qp = (struct ipath_qp *)data; - struct ipath_ibdev *dev = to_idev(qp->ibqp.device); struct ipath_swqe *wqe; - unsigned long flags; - u16 lrh0; u32 hwords; - u32 nwords; - u32 extra_bytes; u32 bth0; - u32 bth2; - u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); u32 len; - struct ipath_other_headers *ohdr; struct ib_wc wc; - if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags)) - goto bail; - - if (unlikely(qp->remote_ah_attr.dlid == - ipath_layer_get_lid(dev->dd))) { - /* Pass in an uninitialized ib_wc to save stack space. */ - ipath_ruc_loopback(qp, &wc); - clear_bit(IPATH_S_BUSY, &qp->s_flags); - goto bail; - } - - ohdr = &qp->s_hdr.u.oth; - if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) - ohdr = &qp->s_hdr.u.l.oth; - -again: - /* Check for a constructed packet to be sent. */ - if (qp->s_hdrwords != 0) { - /* - * If no PIO bufs are available, return. - * An interrupt will call ipath_ib_piobufavail() - * when one is available. - */ - if (ipath_verbs_send(dev->dd, qp->s_hdrwords, - (u32 *) &qp->s_hdr, - qp->s_cur_size, - qp->s_cur_sge)) { - ipath_no_bufs_available(qp, dev); - goto bail; - } - dev->n_unicast_xmit++; - /* Record that we sent the packet and s_hdr is empty. */ - qp->s_hdrwords = 0; - } - - lrh0 = IPS_LRH_BTH; + if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) + goto done; + /* header size in 32-bit words LRH+BTH = (8+12)/4. */ hwords = 5; - - /* - * The lock is needed to synchronize between - * setting qp->s_ack_state and post_send(). - */ - spin_lock_irqsave(&qp->s_lock, flags); - - if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) - goto done; - - bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index); - - /* Send a request. */ + bth0 = 0; + + /* Get the next send request. */ wqe = get_swqe_ptr(qp, qp->s_last); switch (qp->s_state) { default: /* - * Signal the completion of the last send (if there is - * one). + * Signal the completion of the last send + * (if there is one). */ if (qp->s_last != qp->s_tail) complete_last_send(qp, wqe, &wc); @@ -257,61 +207,16 @@ again: } break; } - bth2 = qp->s_next_psn++ & IPS_PSN_MASK; qp->s_len -= len; - bth0 |= qp->s_state << 24; - - spin_unlock_irqrestore(&qp->s_lock, flags); - - /* Construct the header. */ - extra_bytes = (4 - len) & 3; - nwords = (len + extra_bytes) >> 2; - if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { - /* Header size in 32-bit words. */ - hwords += 10; - lrh0 = IPS_LRH_GRH; - qp->s_hdr.u.l.grh.version_tclass_flow = - cpu_to_be32((6 << 28) | - (qp->remote_ah_attr.grh.traffic_class - << 20) | - qp->remote_ah_attr.grh.flow_label); - qp->s_hdr.u.l.grh.paylen = - cpu_to_be16(((hwords - 12) + nwords + - SIZE_OF_CRC) << 2); - /* next_hdr is defined by C8-7 in ch. 8.4.1 */ - qp->s_hdr.u.l.grh.next_hdr = 0x1B; - qp->s_hdr.u.l.grh.hop_limit = - qp->remote_ah_attr.grh.hop_limit; - /* The SGID is 32-bit aligned. */ - qp->s_hdr.u.l.grh.sgid.global.subnet_prefix = - dev->gid_prefix; - qp->s_hdr.u.l.grh.sgid.global.interface_id = - ipath_layer_get_guid(dev->dd); - qp->s_hdr.u.l.grh.dgid = qp->remote_ah_attr.grh.dgid; - } qp->s_hdrwords = hwords; qp->s_cur_sge = &qp->s_sge; qp->s_cur_size = len; - lrh0 |= qp->remote_ah_attr.sl << 4; - qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); - /* DEST LID */ - qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); - qp->s_hdr.lrh[2] = cpu_to_be16(hwords + nwords + SIZE_OF_CRC); - qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd)); - bth0 |= extra_bytes << 20; - ohdr->bth[0] = cpu_to_be32(bth0); - ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); - ohdr->bth[2] = cpu_to_be32(bth2); - - /* Check for more work to do. */ - goto again; + *bth0p = bth0 | (qp->s_state << 24); + *bth2p = qp->s_next_psn++ & IPS_PSN_MASK; + return 1; done: - spin_unlock_irqrestore(&qp->s_lock, flags); - clear_bit(IPATH_S_BUSY, &qp->s_flags); - -bail: - return; + return 0; } /** @@ -535,12 +440,13 @@ void ipath_uc_rcv(struct ipath_ibdev *de if (qp->r_len != 0) { u32 rkey = be32_to_cpu(reth->rkey); u64 vaddr = be64_to_cpu(reth->vaddr); + int ok; /* Check rkey */ - if (unlikely(!ipath_rkey_ok( - dev, &qp->r_sge, qp->r_len, - vaddr, rkey, - IB_ACCESS_REMOTE_WRITE))) { + ok = ipath_rkey_ok(dev, &qp->r_sge, qp->r_len, + vaddr, rkey, + IB_ACCESS_REMOTE_WRITE); + if (unlikely(!ok)) { dev->n_pkt_drops++; goto done; } @@ -558,8 +464,7 @@ void ipath_uc_rcv(struct ipath_ibdev *de } if (opcode == OP(RDMA_WRITE_ONLY)) goto rdma_last; - else if (opcode == - OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) + else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) goto rdma_last_imm; /* FALLTHROUGH */ case OP(RDMA_WRITE_MIDDLE): @@ -592,9 +497,9 @@ void ipath_uc_rcv(struct ipath_ibdev *de dev->n_pkt_drops++; goto done; } - if (qp->r_reuse_sge) { + if (qp->r_reuse_sge) qp->r_reuse_sge = 0; - } else if (!ipath_get_rwqe(qp, 1)) { + else if (!ipath_get_rwqe(qp, 1)) { dev->n_pkt_drops++; goto done; } diff -r 947e92f4b370 -r 201654fe1962 drivers/infiniband/hw/ipath/ipath_verbs.c --- a/drivers/infiniband/hw/ipath/ipath_verbs.c Fri May 12 15:55:28 2006 -0700 +++ b/drivers/infiniband/hw/ipath/ipath_verbs.c Fri May 12 15:55:28 2006 -0700 @@ -246,7 +246,7 @@ static int ipath_post_send(struct ib_qp switch (qp->ibqp.qp_type) { case IB_QPT_UC: case IB_QPT_RC: - err = ipath_post_rc_send(qp, wr); + err = ipath_post_ruc_send(qp, wr); break; case IB_QPT_SMI: diff -r 947e92f4b370 -r 201654fe1962 drivers/infiniband/hw/ipath/ipath_verbs.h --- a/drivers/infiniband/hw/ipath/ipath_verbs.h Fri May 12 15:55:28 2006 -0700 +++ b/drivers/infiniband/hw/ipath/ipath_verbs.h Fri May 12 15:55:28 2006 -0700 @@ -585,10 +585,6 @@ void ipath_sqerror_qp(struct ipath_qp *q void ipath_get_credit(struct ipath_qp *qp, u32 aeth); -void ipath_do_rc_send(unsigned long data); - -void ipath_do_uc_send(unsigned long data); - void ipath_cq_enter(struct ipath_cq *cq, struct ib_wc *entry, int sig); int ipath_rkey_ok(struct ipath_ibdev *dev, struct ipath_sge_state *ss, @@ -601,7 +597,7 @@ void ipath_copy_sge(struct ipath_sge_sta void ipath_skip_sge(struct ipath_sge_state *ss, u32 length); -int ipath_post_rc_send(struct ipath_qp *qp, struct ib_send_wr *wr); +int ipath_post_ruc_send(struct ipath_qp *qp, struct ib_send_wr *wr); void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, int has_grh, void *data, u32 tlen, struct ipath_qp *qp); @@ -683,7 +679,19 @@ void ipath_insert_rnr_queue(struct ipath int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only); -void ipath_ruc_loopback(struct ipath_qp *sqp, struct ib_wc *wc); +u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr, + struct ib_global_route *grh, u32 hwords, u32 nwords); + +void ipath_do_ruc_send(unsigned long data); + +u32 ipath_make_rc_ack(struct ipath_qp *qp, struct ipath_other_headers *ohdr, + u32 pmtu); + +int ipath_make_rc_req(struct ipath_qp *qp, struct ipath_other_headers *ohdr, + u32 pmtu, u32 *bth0p, u32 *bth2p); + +int ipath_make_uc_req(struct ipath_qp *qp, struct ipath_other_headers *ohdr, + u32 pmtu, u32 *bth0p, u32 *bth2p); extern const enum ib_wc_opcode ib_ipath_wc_opcode[]; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/