/** * rvt_clear_mr_refs - Drop help mr refs * @qp: rvt qp data structure * @clr_sends: If shoudl clear send side or not */ static void rvt_clear_mr_refs(struct rvt_qp *qp, int clr_sends) { unsigned n; if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) rvt_put_ss(&qp->s_rdma_read_sge); rvt_put_ss(&qp->r_sge); if (clr_sends) { while (qp->s_last != qp->s_head) { struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_last); unsigned i; for (i = 0; i < wqe->wr.num_sge; i++) { struct rvt_sge *sge = &wqe->sg_list[i]; rvt_put_mr(sge->mr); } if (qp->ibqp.qp_type == IB_QPT_UD || qp->ibqp.qp_type == IB_QPT_SMI || qp->ibqp.qp_type == IB_QPT_GSI) atomic_dec(&ibah_to_rvtah( wqe->ud_wr.ah)->refcount); if (++qp->s_last >= qp->s_size) qp->s_last = 0; smp_wmb(); /* see qp_set_savail */ } if (qp->s_rdma_mr) { rvt_put_mr(qp->s_rdma_mr); qp->s_rdma_mr = NULL; } } if (qp->ibqp.qp_type != IB_QPT_RC) return; for (n = 0; n < ARRAY_SIZE(qp->s_ack_queue); n++) { struct rvt_ack_entry *e = &qp->s_ack_queue[n]; if (e->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST && e->rdma_sge.mr) { rvt_put_mr(e->rdma_sge.mr); e->rdma_sge.mr = NULL; } } }
/** * hfi1_uc_rcv - handle an incoming UC packet * @ibp: the port the packet came in on * @hdr: the header of the packet * @rcv_flags: flags relevant to rcv processing * @data: the packet data * @tlen: the length of the packet * @qp: the QP for this packet. * * This is called from qp_rcv() to process an incoming UC packet * for the given QP. * Called at interrupt level. */ void hfi1_uc_rcv(struct hfi1_packet *packet) { struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd); void *data = packet->payload; u32 tlen = packet->tlen; struct rvt_qp *qp = packet->qp; struct ib_other_headers *ohdr = packet->ohdr; u32 opcode = packet->opcode; u32 hdrsize = packet->hlen; u32 psn; u32 pad = packet->pad; struct ib_wc wc; u32 pmtu = qp->pmtu; struct ib_reth *reth; int ret; u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2); if (hfi1_ruc_check_hdr(ibp, packet)) return; process_ecn(qp, packet, true); psn = ib_bth_get_psn(ohdr); /* Compare the PSN verses the expected PSN. */ if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) { /* * Handle a sequence error. * Silently drop any current message. */ qp->r_psn = psn; inv: if (qp->r_state == OP(SEND_FIRST) || qp->r_state == OP(SEND_MIDDLE)) { set_bit(RVT_R_REWIND_SGE, &qp->r_aflags); qp->r_sge.num_sge = 0; } else { rvt_put_ss(&qp->r_sge); } qp->r_state = OP(SEND_LAST); switch (opcode) { case OP(SEND_FIRST): case OP(SEND_ONLY): case OP(SEND_ONLY_WITH_IMMEDIATE): goto send_first; case OP(RDMA_WRITE_FIRST): case OP(RDMA_WRITE_ONLY): case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): goto rdma_first; default: goto drop; } } /* Check for opcode sequence errors. */ switch (qp->r_state) { case OP(SEND_FIRST): case OP(SEND_MIDDLE): if (opcode == OP(SEND_MIDDLE) || opcode == OP(SEND_LAST) || opcode == OP(SEND_LAST_WITH_IMMEDIATE)) break; goto inv; case OP(RDMA_WRITE_FIRST): case OP(RDMA_WRITE_MIDDLE): if (opcode == OP(RDMA_WRITE_MIDDLE) || opcode == OP(RDMA_WRITE_LAST) || opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) break; goto inv; default: if (opcode == OP(SEND_FIRST) || opcode == OP(SEND_ONLY) || opcode == OP(SEND_ONLY_WITH_IMMEDIATE) || opcode == OP(RDMA_WRITE_FIRST) || opcode == OP(RDMA_WRITE_ONLY) || opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) break; goto inv; } if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST)) rvt_comm_est(qp); /* OK, process the packet. */ switch (opcode) { case OP(SEND_FIRST): case OP(SEND_ONLY): case OP(SEND_ONLY_WITH_IMMEDIATE): send_first: if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) { qp->r_sge = qp->s_rdma_read_sge; } else { ret = hfi1_rvt_get_rwqe(qp, 0); if (ret < 0) goto op_err; if (!ret) goto drop; /* * qp->s_rdma_read_sge will be the owner * of the mr references. */ qp->s_rdma_read_sge = qp->r_sge; } qp->r_rcv_len = 0; if (opcode == OP(SEND_ONLY)) goto no_immediate_data; else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE)) goto send_last_imm; /* FALLTHROUGH */ case OP(SEND_MIDDLE): /* Check for invalid length PMTU or posted rwqe len. */ /* * There will be no padding for 9B packet but 16B packets * will come in with some padding since we always add * CRC and LT bytes which will need to be flit aligned */ if (unlikely(tlen != (hdrsize + pmtu + extra_bytes))) goto rewind; qp->r_rcv_len += pmtu; if (unlikely(qp->r_rcv_len > qp->r_len)) goto rewind; hfi1_copy_sge(&qp->r_sge, data, pmtu, false, false); break; case OP(SEND_LAST_WITH_IMMEDIATE): send_last_imm: wc.ex.imm_data = ohdr->u.imm_data; wc.wc_flags = IB_WC_WITH_IMM; goto send_last; case OP(SEND_LAST): no_immediate_data: wc.ex.imm_data = 0; wc.wc_flags = 0; send_last: /* Check for invalid length. */ /* LAST len should be >= 1 */ if (unlikely(tlen < (hdrsize + extra_bytes))) goto rewind; /* Don't count the CRC. */ tlen -= (hdrsize + extra_bytes); wc.byte_len = tlen + qp->r_rcv_len; if (unlikely(wc.byte_len > qp->r_len)) goto rewind; wc.opcode = IB_WC_RECV; hfi1_copy_sge(&qp->r_sge, data, tlen, false, false); rvt_put_ss(&qp->s_rdma_read_sge); last_imm: wc.wr_id = qp->r_wr_id; wc.status = IB_WC_SUCCESS; wc.qp = &qp->ibqp; wc.src_qp = qp->remote_qpn; wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX; /* * It seems that IB mandates the presence of an SL in a * work completion only for the UD transport (see section * 11.4.2 of IBTA Vol. 1). * * However, the way the SL is chosen below is consistent * with the way that IB/qib works and is trying avoid * introducing incompatibilities. * * See also OPA Vol. 1, section 9.7.6, and table 9-17. */ wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); /* zero fields that are N/A */ wc.vendor_err = 0; wc.pkey_index = 0; wc.dlid_path_bits = 0; wc.port_num = 0; /* Signal completion event if the solicited bit is set. */ rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, ib_bth_is_solicited(ohdr)); break; case OP(RDMA_WRITE_FIRST): case OP(RDMA_WRITE_ONLY): case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */ rdma_first: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) { goto drop; } reth = &ohdr->u.rc.reth; qp->r_len = be32_to_cpu(reth->length); qp->r_rcv_len = 0; qp->r_sge.sg_list = NULL; if (qp->r_len != 0) { u32 rkey = be32_to_cpu(reth->rkey); u64 vaddr = be64_to_cpu(reth->vaddr); int ok; /* Check rkey */ ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr, rkey, IB_ACCESS_REMOTE_WRITE); if (unlikely(!ok)) goto drop; qp->r_sge.num_sge = 1; } else { qp->r_sge.num_sge = 0; qp->r_sge.sge.mr = NULL; qp->r_sge.sge.vaddr = NULL; qp->r_sge.sge.length = 0; qp->r_sge.sge.sge_length = 0; } if (opcode == OP(RDMA_WRITE_ONLY)) { goto rdma_last; } else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) { wc.ex.imm_data = ohdr->u.rc.imm_data; goto rdma_last_imm; } /* FALLTHROUGH */ case OP(RDMA_WRITE_MIDDLE): /* Check for invalid length PMTU or posted rwqe len. */ if (unlikely(tlen != (hdrsize + pmtu + 4))) goto drop; qp->r_rcv_len += pmtu; if (unlikely(qp->r_rcv_len > qp->r_len)) goto drop; hfi1_copy_sge(&qp->r_sge, data, pmtu, true, false); break; case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): wc.ex.imm_data = ohdr->u.imm_data; rdma_last_imm: wc.wc_flags = IB_WC_WITH_IMM; /* Check for invalid length. */ /* LAST len should be >= 1 */ if (unlikely(tlen < (hdrsize + pad + 4))) goto drop; /* Don't count the CRC. */ tlen -= (hdrsize + extra_bytes); if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) goto drop; if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) { rvt_put_ss(&qp->s_rdma_read_sge); } else { ret = hfi1_rvt_get_rwqe(qp, 1); if (ret < 0) goto op_err; if (!ret) goto drop; } wc.byte_len = qp->r_len; wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; hfi1_copy_sge(&qp->r_sge, data, tlen, true, false); rvt_put_ss(&qp->r_sge); goto last_imm; case OP(RDMA_WRITE_LAST): rdma_last: /* Check for invalid length. */ /* LAST len should be >= 1 */ if (unlikely(tlen < (hdrsize + pad + 4))) goto drop; /* Don't count the CRC. */ tlen -= (hdrsize + extra_bytes); if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) goto drop; hfi1_copy_sge(&qp->r_sge, data, tlen, true, false); rvt_put_ss(&qp->r_sge); break; default: /* Drop packet for unknown opcodes. */ goto drop; } qp->r_psn++; qp->r_state = opcode; return; rewind: set_bit(RVT_R_REWIND_SGE, &qp->r_aflags); qp->r_sge.num_sge = 0; drop: ibp->rvp.n_pkt_drops++; return; op_err: rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); }