From patchwork Sun Jan 14 22:36:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bernard Metzler X-Patchwork-Id: 10162883 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C7AA260390 for ; Sun, 14 Jan 2018 22:36:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B5C6A2887E for ; Sun, 14 Jan 2018 22:36:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A9782288F9; Sun, 14 Jan 2018 22:36:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 582AF2887E for ; Sun, 14 Jan 2018 22:36:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753136AbeANWgf (ORCPT ); Sun, 14 Jan 2018 17:36:35 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:41552 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752637AbeANWga (ORCPT ); Sun, 14 Jan 2018 17:36:30 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w0EMYJe2002823 for ; Sun, 14 Jan 2018 17:36:30 -0500 Received: from e06smtp12.uk.ibm.com (e06smtp12.uk.ibm.com [195.75.94.108]) by mx0b-001b2d01.pphosted.com with ESMTP id 2fg0aw3mfx-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Sun, 14 Jan 2018 17:36:29 -0500 Received: from localhost by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Sun, 14 Jan 2018 22:36:26 -0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w0EMaQ4n10813562; Sun, 14 Jan 2018 22:36:26 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B4B8311C04C; Sun, 14 Jan 2018 22:30:12 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 822DF11C04A; Sun, 14 Jan 2018 22:30:12 +0000 (GMT) Received: from zac27.zurich.ibm.com (unknown [9.4.233.128]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Sun, 14 Jan 2018 22:30:12 +0000 (GMT) From: Bernard Metzler To: linux-rdma@vger.kernel.org Cc: Bernard Metzler Subject: [PATCH v3 10/13] SoftiWarp receive path Date: Sun, 14 Jan 2018 17:36:00 -0500 X-Mailer: git-send-email 2.13.6 In-Reply-To: <20180114223603.19961-1-bmt@zurich.ibm.com> References: <20180114223603.19961-1-bmt@zurich.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18011422-0008-0000-0000-000004C1A533 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18011422-0009-0000-0000-00001E5508ED Message-Id: <20180114223603.19961-11-bmt@zurich.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2018-01-14_14:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=4 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1801140321 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Bernard Metzler --- drivers/infiniband/sw/siw/siw_qp_rx.c | 1531 +++++++++++++++++++++++++++++++++ 1 file changed, 1531 insertions(+) create mode 100644 drivers/infiniband/sw/siw/siw_qp_rx.c diff --git a/drivers/infiniband/sw/siw/siw_qp_rx.c b/drivers/infiniband/sw/siw/siw_qp_rx.c new file mode 100644 index 000000000000..9af148a23624 --- /dev/null +++ b/drivers/infiniband/sw/siw/siw_qp_rx.c @@ -0,0 +1,1531 @@ +/* + * Software iWARP device driver + * + * Authors: Bernard Metzler + * Fredy Neeser + * + * Copyright (c) 2008-2017, IBM Corporation + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * - Neither the name of IBM nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "siw.h" +#include "siw_obj.h" +#include "siw_cm.h" + +/* + * ---------------------------- + * DDP reassembly for Softiwarp + * ---------------------------- + * For the ordering of transmitted DDP segments, the relevant iWARP ordering + * rules are as follows: + * + * - RDMAP (RFC 5040): Section 7.5, Rule 17: + * "RDMA Read Response Message processing at the Remote Peer (reading + * the specified Tagged Buffer) MUST be started only after the RDMA + * Read Request Message has been Delivered by the DDP layer (thus, + * all previous RDMA Messages have been properly submitted for + * ordered Placement)." + * + * - DDP (RFC 5041): Section 5.3: + * "At the Data Source, DDP: + * o MUST transmit DDP Messages in the order they were submitted to + * the DDP layer, + * o SHOULD transmit DDP Segments within a DDP Message in increasing + * MO order for Untagged DDP Messages, and in increasing TO order + * for Tagged DDP Messages." + * + * Combining these rules implies that, although RDMAP does not provide + * ordering between operations that are generated from the two ends of an + * RDMAP stream, DDP *must not* transmit an RDMA Read Response Message before + * it has finished transmitting SQ operations that were already submitted + * to the DDP layer. It follows that an iWARP transmitter must fully + * serialize RDMAP messages belonging to the same QP. + * + * Given that a TCP socket receives DDP segments in peer transmit order, + * we obtain the following ordering of received DDP segments: + * + * (i) the received DDP segments of RDMAP messages for the same QP + * cannot be interleaved + * (ii) the received DDP segments of a single RDMAP message *should* + * arrive in order. + * + * The Softiwarp transmitter obeys rule #2 in DDP Section 5.3. + * With this property, the "should" becomes a "must" in (ii) above, + * which simplifies DDP reassembly considerably. + * The Softiwarp receiver currently relies on this property + * and reports an error if DDP segments of the same RDMAP message + * do not arrive in sequence. + */ + +static inline int siw_crc_rxhdr(struct siw_iwarp_rx *ctx) +{ + crypto_shash_init(ctx->mpa_crc_hd); + + return siw_crc_array(ctx->mpa_crc_hd, (u8 *)&ctx->hdr, + ctx->fpdu_part_rcvd); +} + +/* + * siw_rx_umem() + * + * Receive data of @len into target referenced by @rctx. + * This function does not check if umem is within bounds requested by + * @len and @t_off. @umem_ends indicates if routine should + * not update chunk position pointers after the point it is + * currently receiving + * + * @rctx: Receive Context + * @umem: siw representation of target memory + * @dest_addr: 1, if rctx chunk pointer should not be updated after len. + */ +static int siw_rx_umem(struct siw_iwarp_rx *rctx, struct siw_umem *umem, + u64 dest_addr, int len) +{ + void *dest; + int pg_off = dest_addr & ~PAGE_MASK, + copied = 0, + bytes, + rv; + + while (len) { + struct page *p = siw_get_upage(umem, dest_addr); + + if (unlikely(!p)) { + pr_warn("siw: %s: [QP %d]: bogus addr: %p, %p\n", + __func__, RX_QPID(rctx), + (void *)dest_addr, (void *)umem->fp_addr); + /* siw internal error */ + rctx->skb_copied += copied; + rctx->skb_new -= copied; + copied = -EFAULT; + + goto out; + } + + bytes = min(len, (int)PAGE_SIZE - pg_off); + dest = kmap_atomic(p); + + siw_dbg_qp(rx_qp(rctx), "page %p, bytes=%u\n", p, bytes); + + rv = skb_copy_bits(rctx->skb, rctx->skb_offset, dest + pg_off, + bytes); + if (likely(!rv)) { + if (rctx->mpa_crc_hd) + rv = siw_crc_page(rctx->mpa_crc_hd, p, pg_off, + bytes); + + rctx->skb_offset += bytes; + copied += bytes; + len -= bytes; + dest_addr += bytes; + pg_off = 0; + } + kunmap_atomic(dest); + + if (unlikely(rv)) { + rctx->skb_copied += copied; + rctx->skb_new -= copied; + copied = -EFAULT; + + pr_warn("siw: [QP %d]: %s, len %d, page %p, rv %d\n", + RX_QPID(rctx), __func__, len, p, rv); + + goto out; + } + } + /* + * store chunk position for resume + */ + rctx->skb_copied += copied; + rctx->skb_new -= copied; +out: + return copied; +} + +static inline int siw_rx_kva(struct siw_iwarp_rx *rctx, void *kva, int len) +{ + int rv; + + siw_dbg_qp(rx_qp(rctx), "kva %p, bytes=%u\n", kva, len); + + rv = skb_copy_bits(rctx->skb, rctx->skb_offset, kva, len); + if (likely(!rv)) { + rctx->skb_offset += len; + rctx->skb_copied += len; + rctx->skb_new -= len; + if (rctx->mpa_crc_hd) { + rv = siw_crc_array(rctx->mpa_crc_hd, kva, len); + if (rv) + goto error; + } + return len; + } + pr_warn("siw: [QP %d]: %s, len %d, kva %p, rv %d\n", + RX_QPID(rctx), __func__, len, kva, rv); +error: + return rv; +} + +static int siw_rx_pbl(struct siw_iwarp_rx *rctx, struct siw_mr *mr, + u64 addr, int len) +{ + struct siw_pbl *pbl = mr->pbl; + u64 offset = addr - mr->mem.va; + int copied = 0; + + while (len) { + int bytes; + u64 buf_addr = siw_pbl_get_buffer(pbl, offset, &bytes, + &rctx->pbl_idx); + if (!buf_addr) + break; + + bytes = min(bytes, len); + if (siw_rx_kva(rctx, (void *)buf_addr, bytes) == bytes) { + copied += bytes; + offset += bytes; + len -= bytes; + } else + break; + } + return copied; +} + +/* + * siw_rresp_check_ntoh() + * + * Check incoming RRESP fragment header against expected + * header values and update expected values for potential next + * fragment. + * + * NOTE: This function must be called only if a RRESP DDP segment + * starts but not for fragmented consecutive pieces of an + * already started DDP segement. + */ +static inline int siw_rresp_check_ntoh(struct siw_iwarp_rx *rctx) +{ + struct iwarp_rdma_rresp *rresp = &rctx->hdr.rresp; + struct siw_wqe *wqe = &rctx->wqe_active; + enum ddp_ecode ecode; + + u32 sink_stag = be32_to_cpu(rresp->sink_stag); + u64 sink_to = be64_to_cpu(rresp->sink_to); + + if (rctx->first_ddp_seg) { + rctx->ddp_stag = wqe->sqe.sge[0].lkey; + rctx->ddp_to = wqe->sqe.sge[0].laddr; + rctx->pbl_idx = 0; + } + /* Below checks extend beyond the smeantics of DDP, and + * into RDMAP: + * We check if the read response matches exactly the + * read request which was send to the remote peer to + * trigger this read response. RFC5040/5041 do not + * always have a proper error code for the detected + * error cases. We choose 'base or bounds error' for + * cases where the inbound STag is valid, but offset + * or length do not match our response receive state. + */ + if (unlikely(rctx->ddp_stag != sink_stag)) { + pr_warn("siw: [QP %d]: rresp stag: %08x != %08x\n", + RX_QPID(rctx), sink_stag, rctx->ddp_stag); + ecode = DDP_ECODE_T_INVALID_STAG; + goto error; + } + if (unlikely(rctx->ddp_to != sink_to)) { + pr_warn("siw: [QP %d]: rresp off: %016llx != %016llx\n", + RX_QPID(rctx), (unsigned long long)sink_to, + (unsigned long long)rctx->ddp_to); + ecode = DDP_ECODE_T_BASE_BOUNDS; + goto error; + } + if (unlikely(!rctx->more_ddp_segs && + (wqe->processed + rctx->fpdu_part_rem != wqe->bytes))) { + pr_warn("siw: [QP %d]: rresp len: %d != %d\n", + RX_QPID(rctx), wqe->processed + rctx->fpdu_part_rem, + wqe->bytes); + ecode = DDP_ECODE_T_BASE_BOUNDS; + goto error; + } + return 0; +error: + siw_init_terminate(rx_qp(rctx), TERM_ERROR_LAYER_DDP, + DDP_ETYPE_TAGGED_BUF, ecode, 0); + return -EINVAL; +} + +/* + * siw_write_check_ntoh() + * + * Check incoming WRITE fragment header against expected + * header values and update expected values for potential next + * fragment + * + * NOTE: This function must be called only if a WRITE DDP segment + * starts but not for fragmented consecutive pieces of an + * already started DDP segement. + */ +static inline int siw_write_check_ntoh(struct siw_iwarp_rx *rctx) +{ + struct iwarp_rdma_write *write = &rctx->hdr.rwrite; + enum ddp_ecode ecode; + + u32 sink_stag = be32_to_cpu(write->sink_stag); + u64 sink_to = be64_to_cpu(write->sink_to); + + if (rctx->first_ddp_seg) { + rctx->ddp_stag = sink_stag; + rctx->ddp_to = sink_to; + rctx->pbl_idx = 0; + } else { + if (unlikely(rctx->ddp_stag != sink_stag)) { + pr_warn("siw: [QP %d]: write stag: %08x != %08x\n", + RX_QPID(rctx), sink_stag, rctx->ddp_stag); + ecode = DDP_ECODE_T_INVALID_STAG; + goto error; + } + if (unlikely(rctx->ddp_to != sink_to)) { + pr_warn("siw: [QP %d]: write off: %016llx != %016llx\n", + RX_QPID(rctx), (unsigned long long)sink_to, + (unsigned long long)rctx->ddp_to); + ecode = DDP_ECODE_T_BASE_BOUNDS; + goto error; + } + } + return 0; +error: + siw_init_terminate(rx_qp(rctx), TERM_ERROR_LAYER_DDP, + DDP_ETYPE_TAGGED_BUF, ecode, 0); + return -EINVAL; +} + +/* + * siw_send_check_ntoh() + * + * Check incoming SEND fragment header against expected + * header values and update expected MSN if no next + * fragment expected + * + * NOTE: This function must be called only if a SEND DDP segment + * starts but not for fragmented consecutive pieces of an + * already started DDP segement. + */ +static inline int siw_send_check_ntoh(struct siw_iwarp_rx *rctx) +{ + struct iwarp_send_inv *send = &rctx->hdr.send_inv; + struct siw_wqe *wqe = &rctx->wqe_active; + enum ddp_ecode ecode; + + u32 ddp_msn = be32_to_cpu(send->ddp_msn); + u32 ddp_mo = be32_to_cpu(send->ddp_mo); + u32 ddp_qn = be32_to_cpu(send->ddp_qn); + + if (unlikely(ddp_qn != RDMAP_UNTAGGED_QN_SEND)) { + pr_warn("siw: [QP %d]: invalid ddp qn %d for send\n", + RX_QPID(rctx), ddp_qn); + ecode = DDP_ECODE_UT_INVALID_QN; + goto error; + } + if (unlikely(ddp_msn != rctx->ddp_msn[RDMAP_UNTAGGED_QN_SEND])) { + pr_warn("siw: [QP %d]: send msn: %u != %u\n", + RX_QPID(rctx), ddp_msn, + rctx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]); + ecode = DDP_ECODE_UT_INVALID_MSN_RANGE; + goto error; + } + if (unlikely(ddp_mo != wqe->processed)) { + pr_warn("siw: [QP %d], send mo: %u != %u\n", + RX_QPID(rctx), ddp_mo, wqe->processed); + ecode = DDP_ECODE_UT_INVALID_MO; + goto error; + } + if (rctx->first_ddp_seg) { + /* initialize user memory write position */ + rctx->sge_idx = 0; + rctx->sge_off = 0; + rctx->pbl_idx = 0; + + /* only valid for SEND_INV and SEND_SE_INV operations */ + rctx->inval_stag = be32_to_cpu(send->inval_stag); + } + if (unlikely(wqe->bytes < wqe->processed + rctx->fpdu_part_rem)) { + siw_dbg_qp(rx_qp(rctx), "receive space short: %d - %d < %d\n", + wqe->bytes, wqe->processed, rctx->fpdu_part_rem); + wqe->wc_status = SIW_WC_LOC_LEN_ERR; + ecode = DDP_ECODE_UT_INVALID_MSN_NOBUF; + goto error; + } + return 0; +error: + siw_init_terminate(rx_qp(rctx), TERM_ERROR_LAYER_DDP, + DDP_ETYPE_UNTAGGED_BUF, ecode, 0); + return -EINVAL; +} + +static struct siw_wqe *siw_rqe_get(struct siw_qp *qp) +{ + struct siw_rqe *rqe; + struct siw_srq *srq = qp->srq; + struct siw_wqe *wqe = NULL; + bool is_srq = false; + unsigned long flags; + + if (srq) { + is_srq = true; + spin_lock_irqsave(&srq->lock, flags); + rqe = &srq->recvq[srq->rq_get % srq->num_rqe]; + } else { + rqe = &qp->recvq[qp->rq_get % qp->attrs.rq_size]; + } + if (likely(rqe->flags == SIW_WQE_VALID)) { + int num_sge = rqe->num_sge; + + if (likely(num_sge <= SIW_MAX_SGE)) { + int i = 0; + + wqe = rx_wqe(qp); + rx_type(wqe) = SIW_OP_RECEIVE; + wqe->wr_status = SIW_WR_INPROGRESS; + wqe->bytes = 0; + wqe->processed = 0; + + wqe->rqe.id = rqe->id; + wqe->rqe.num_sge = num_sge; + + while (i < num_sge) { + wqe->rqe.sge[i].laddr = rqe->sge[i].laddr; + wqe->rqe.sge[i].lkey = rqe->sge[i].lkey; + wqe->rqe.sge[i].length = rqe->sge[i].length; + wqe->bytes += wqe->rqe.sge[i].length; + wqe->mem[i] = NULL; + i++; + } + /* can be re-used by appl */ + smp_store_mb(rqe->flags, 0); + } else { + siw_dbg_qp(qp, "too many sge's: %d\n", rqe->num_sge); + goto out_unlock; + } + if (!is_srq) { + qp->rq_get++; + } else { + if (srq->armed) { + /* Test SRQ limit */ + u32 off = (srq->rq_get + srq->limit) % + srq->num_rqe; + struct siw_rqe *rqe2 = &srq->recvq[off]; + + if (!(rqe2->flags & SIW_WQE_VALID)) { + srq->armed = 0; + siw_srq_event(srq, + IB_EVENT_SRQ_LIMIT_REACHED); + } + } + srq->rq_get++; + } + } +out_unlock: + if (is_srq) + spin_unlock_irqrestore(&srq->lock, flags); + + return wqe; +} + +/* + * siw_proc_send: + * + * Process one incoming SEND and place data into memory referenced by + * receive wqe. + * + * Function supports partially received sends (suspending/resuming + * current receive wqe processing) + * + * return value: + * 0: reached the end of a DDP segment + * -EAGAIN: to be called again to finish the DDP segment + */ +int siw_proc_send(struct siw_qp *qp, struct siw_iwarp_rx *rctx) +{ + struct siw_wqe *wqe; + struct siw_sge *sge; + u32 data_bytes, /* all data bytes available */ + rcvd_bytes; /* sum of data bytes rcvd */ + int rv = 0; + + if (rctx->first_ddp_seg) { + wqe = siw_rqe_get(qp); + if (unlikely(!wqe)) { + siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, + DDP_ETYPE_UNTAGGED_BUF, + DDP_ECODE_UT_INVALID_MSN_NOBUF, 0); + return -ENOENT; + } + } else { + wqe = rx_wqe(qp); + } + if (rctx->state == SIW_GET_DATA_START) { + rv = siw_send_check_ntoh(rctx); + if (unlikely(rv)) { + siw_qp_event(qp, IB_EVENT_QP_FATAL); + return rv; + } + if (!rctx->fpdu_part_rem) /* zero length SEND */ + return 0; + } + data_bytes = min(rctx->fpdu_part_rem, rctx->skb_new); + rcvd_bytes = 0; + + /* A zero length SEND will skip below loop */ + while (data_bytes) { + struct siw_pd *pd; + struct siw_mr *mr; + struct siw_mem **mem; + u32 sge_bytes; /* data bytes avail for SGE */ + + sge = &wqe->rqe.sge[rctx->sge_idx]; + + if (!sge->length) { + /* just skip empty sge's */ + rctx->sge_idx++; + rctx->sge_off = 0; + rctx->pbl_idx = 0; + continue; + } + sge_bytes = min(data_bytes, sge->length - rctx->sge_off); + mem = &wqe->mem[rctx->sge_idx]; + + /* + * check with QP's PD if no SRQ present, SRQ's PD otherwise + */ + pd = qp->srq == NULL ? qp->pd : qp->srq->pd; + + rv = siw_check_sge(pd, sge, mem, SIW_MEM_LWRITE, rctx->sge_off, + sge_bytes); + if (unlikely(rv)) { + siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, + DDP_ETYPE_CATASTROPHIC, + DDP_ECODE_CATASTROPHIC, 0); + + siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR); + break; + } + mr = siw_mem2mr(*mem); + if (mr->mem_obj == NULL) + rv = siw_rx_kva(rctx, + (void *)(sge->laddr + rctx->sge_off), + sge_bytes); + else if (!mr->mem.is_pbl) + rv = siw_rx_umem(rctx, mr->umem, + sge->laddr + rctx->sge_off, sge_bytes); + else + rv = siw_rx_pbl(rctx, mr, + sge->laddr + rctx->sge_off, sge_bytes); + + if (unlikely(rv != sge_bytes)) { + wqe->processed += rcvd_bytes; + + siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, + DDP_ETYPE_CATASTROPHIC, + DDP_ECODE_CATASTROPHIC, 0); + return -EINVAL; + } + rctx->sge_off += rv; + + if (rctx->sge_off == sge->length) { + rctx->sge_idx++; + rctx->sge_off = 0; + rctx->pbl_idx = 0; + } + data_bytes -= rv; + rcvd_bytes += rv; + + rctx->fpdu_part_rem -= rv; + rctx->fpdu_part_rcvd += rv; + } + wqe->processed += rcvd_bytes; + + if (!rctx->fpdu_part_rem) + return 0; + + return (rv < 0) ? rv : -EAGAIN; +} + +/* + * siw_proc_write: + * + * Place incoming WRITE after referencing and checking target buffer + + * Function supports partially received WRITEs (suspending/resuming + * current receive processing) + * + * return value: + * 0: reached the end of a DDP segment + * -EAGAIN: to be called again to finish the DDP segment + */ +int siw_proc_write(struct siw_qp *qp, struct siw_iwarp_rx *rctx) +{ + struct siw_device *dev = qp->hdr.sdev; + struct siw_mem *mem; + struct siw_mr *mr; + int bytes, + rv; + + if (rctx->state == SIW_GET_DATA_START) { + + if (!rctx->fpdu_part_rem) /* zero length WRITE */ + return 0; + + rv = siw_write_check_ntoh(rctx); + if (unlikely(rv)) { + siw_qp_event(qp, IB_EVENT_QP_FATAL); + return rv; + } + } + bytes = min(rctx->fpdu_part_rem, rctx->skb_new); + + if (rctx->first_ddp_seg) { + rx_mem(qp) = siw_mem_id2obj(dev, rctx->ddp_stag >> 8); + rx_wqe(qp)->wr_status = SIW_WR_INPROGRESS; + rx_type(rx_wqe(qp)) = SIW_OP_WRITE; + } + if (unlikely(!rx_mem(qp))) { + siw_dbg_qp(qp, "sink stag not found/invalid, stag 0x%08x\n", + rctx->ddp_stag); + + siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, + DDP_ETYPE_TAGGED_BUF, + DDP_ECODE_T_INVALID_STAG, 0); + return -EINVAL; + } + mem = rx_mem(qp); + /* + * Rtag not checked against mem's tag again because + * hdr check guarantees same tag as before if fragmented + */ + rv = siw_check_mem(qp->pd, mem, rctx->ddp_to + rctx->fpdu_part_rcvd, + SIW_MEM_RWRITE, bytes); + if (unlikely(rv)) { + siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, + DDP_ETYPE_TAGGED_BUF, + siw_tagged_error(-rv), 0); + + siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR); + + return -EINVAL; + } + + mr = siw_mem2mr(mem); + if (mr->mem_obj == NULL) + rv = siw_rx_kva(rctx, + (void *)(rctx->ddp_to + rctx->fpdu_part_rcvd), + bytes); + else if (!mr->mem.is_pbl) + rv = siw_rx_umem(rctx, mr->umem, + rctx->ddp_to + rctx->fpdu_part_rcvd, bytes); + else + rv = siw_rx_pbl(rctx, mr, + rctx->ddp_to + rctx->fpdu_part_rcvd, bytes); + + if (unlikely(rv != bytes)) { + siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, + DDP_ETYPE_CATASTROPHIC, + DDP_ECODE_CATASTROPHIC, 0); + return -EINVAL; + } + rctx->fpdu_part_rem -= rv; + rctx->fpdu_part_rcvd += rv; + + if (!rctx->fpdu_part_rem) { + rctx->ddp_to += rctx->fpdu_part_rcvd; + return 0; + } + return -EAGAIN; +} + +/* + * Inbound RREQ's cannot carry user data. + */ +int siw_proc_rreq(struct siw_qp *qp, struct siw_iwarp_rx *rctx) +{ + if (!rctx->fpdu_part_rem) + return 0; + + pr_warn("siw: [QP %d]: rreq with mpa len %d\n", QP_ID(qp), + be16_to_cpu(rctx->hdr.ctrl.mpa_len)); + + return -EPROTO; +} + +/* + * siw_init_rresp: + * + * Process inbound RDMA READ REQ. Produce a pseudo READ RESPONSE WQE. + * Put it at the tail of the IRQ, if there is another WQE currently in + * transmit processing. If not, make it the current WQE to be processed + * and schedule transmit processing. + * + * Can be called from softirq context and from process + * context (RREAD socket loopback case!) + * + * return value: + * 0: success, + * failure code otherwise + */ + +static int siw_init_rresp(struct siw_qp *qp, struct siw_iwarp_rx *rctx) +{ + struct siw_wqe *tx_work = tx_wqe(qp); + struct siw_sqe *resp; + + uint64_t raddr = be64_to_cpu(rctx->hdr.rreq.sink_to), + laddr = be64_to_cpu(rctx->hdr.rreq.source_to); + uint32_t length = be32_to_cpu(rctx->hdr.rreq.read_size), + lkey = be32_to_cpu(rctx->hdr.rreq.source_stag), + rkey = be32_to_cpu(rctx->hdr.rreq.sink_stag), + msn = be32_to_cpu(rctx->hdr.rreq.ddp_msn); + + int run_sq = 1, rv = 0; + unsigned long flags; + + if (unlikely(msn != rctx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ])) { + siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, + DDP_ETYPE_UNTAGGED_BUF, + DDP_ECODE_UT_INVALID_MSN_RANGE, 0); + return -EPROTO; + } + spin_lock_irqsave(&qp->sq_lock, flags); + + if (tx_work->wr_status == SIW_WR_IDLE) { + /* + * immediately schedule READ response w/o + * consuming IRQ entry: IRQ must be empty. + */ + tx_work->processed = 0; + tx_work->mem[0] = NULL; + tx_work->wr_status = SIW_WR_QUEUED; + resp = &tx_work->sqe; + } else { + resp = irq_alloc_free(qp); + run_sq = 0; + } + if (likely(resp)) { + resp->opcode = SIW_OP_READ_RESPONSE; + + resp->sge[0].length = length; + resp->sge[0].laddr = laddr; + resp->sge[0].lkey = lkey; + + /* Keep aside message sequence number for potential + * error reporting during Read Response generation. + */ + resp->sge[1].length = msn; + + resp->raddr = raddr; + resp->rkey = rkey; + resp->num_sge = length ? 1 : 0; + + /* RRESP now valid as current TX wqe or placed into IRQ */ + smp_store_mb(resp->flags, SIW_WQE_VALID); + } else { + pr_warn("siw: [QP %d]: irq %d exceeded %d\n", + QP_ID(qp), qp->irq_put % qp->attrs.irq_size, + qp->attrs.irq_size); + + siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP, + RDMAP_ETYPE_REMOTE_OPERATION, + RDMAP_ECODE_CATASTROPHIC_STREAM, 0); + rv = -EPROTO; + } + + spin_unlock_irqrestore(&qp->sq_lock, flags); + + if (run_sq) + rv = siw_sq_start(qp); + + return rv; +} + +/* + * Only called at start of Read.Resonse processing. + * Transfer pending Read from tip of ORQ into currrent rx wqe, + * but keep ORQ entry valid until Read.Response processing done. + * No Queue locking needed. + */ +static int siw_orqe_start_rx(struct siw_qp *qp) +{ + struct siw_sqe *orqe; + struct siw_wqe *wqe = NULL; + + /* make sure ORQ indices are current */ + smp_mb(); + + orqe = orq_get_current(qp); + if (READ_ONCE(orqe->flags) & SIW_WQE_VALID) { + wqe = rx_wqe(qp); + wqe->sqe.id = orqe->id; + wqe->sqe.opcode = orqe->opcode; + wqe->sqe.sge[0].laddr = orqe->sge[0].laddr; + wqe->sqe.sge[0].lkey = orqe->sge[0].lkey; + wqe->sqe.sge[0].length = orqe->sge[0].length; + wqe->sqe.flags = orqe->flags; + wqe->sqe.num_sge = 1; + wqe->bytes = orqe->sge[0].length; + wqe->processed = 0; + wqe->mem[0] = NULL; + /* make sure WQE is completely written before valid */ + smp_wmb(); + wqe->wr_status = SIW_WR_INPROGRESS; + + return 0; + } + return -EPROTO; +} + +/* + * siw_proc_rresp: + * + * Place incoming RRESP data into memory referenced by RREQ WQE + * which is at the tip of the ORQ + * + * Function supports partially received RRESP's (suspending/resuming + * current receive processing) + */ +int siw_proc_rresp(struct siw_qp *qp, struct siw_iwarp_rx *rctx) +{ + struct siw_wqe *wqe = rx_wqe(qp); + struct siw_mem **mem; + struct siw_sge *sge; + struct siw_mr *mr; + int bytes, rv; + + if (rctx->first_ddp_seg) { + if (unlikely(wqe->wr_status != SIW_WR_IDLE)) { + pr_warn("siw: [QP %d]: proc rresp: status %d, op %d\n", + QP_ID(qp), wqe->wr_status, wqe->sqe.opcode); + rv = -EPROTO; + goto error_term; + } + /* + * fetch pending RREQ from orq + */ + rv = siw_orqe_start_rx(qp); + if (rv) { + pr_warn("siw: [QP %d]: orq empty at idx %d\n", + QP_ID(qp), qp->orq_get % qp->attrs.orq_size); + goto error_term; + } + rv = siw_rresp_check_ntoh(rctx); + if (unlikely(rv)) { + siw_qp_event(qp, IB_EVENT_QP_FATAL); + return rv; + } + } else { + if (unlikely(wqe->wr_status != SIW_WR_INPROGRESS)) { + pr_warn("siw: [QP %d]: resume rresp: status %d\n", + QP_ID(qp), wqe->wr_status); + rv = -EPROTO; + goto error_term; + } + } + if (!rctx->fpdu_part_rem) /* zero length RRESPONSE */ + return 0; + + sge = wqe->sqe.sge; /* there is only one */ + mem = &wqe->mem[0]; + + if (!(*mem)) { + /* + * check target memory which resolves memory on first fragment + */ + rv = siw_check_sge(qp->pd, sge, mem, SIW_MEM_LWRITE, 0, + wqe->bytes); + if (rv) { + siw_dbg_qp(qp, "target mem check: %d\n", rv); + wqe->wc_status = SIW_WC_LOC_PROT_ERR; + + siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, + DDP_ETYPE_TAGGED_BUF, + siw_tagged_error(-rv), 0); + + siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR); + + return -EINVAL; + } + } + bytes = min(rctx->fpdu_part_rem, rctx->skb_new); + + mr = siw_mem2mr(*mem); + if (mr->mem_obj == NULL) + rv = siw_rx_kva(rctx, (void *)(sge->laddr + wqe->processed), + bytes); + else if (!mr->mem.is_pbl) + rv = siw_rx_umem(rctx, mr->umem, sge->laddr + wqe->processed, + bytes); + else + rv = siw_rx_pbl(rctx, mr, sge->laddr + wqe->processed, + bytes); + if (rv != bytes) { + wqe->wc_status = SIW_WC_GENERAL_ERR; + rv = -EINVAL; + goto error_term; + } + rctx->fpdu_part_rem -= rv; + rctx->fpdu_part_rcvd += rv; + wqe->processed += rv; + + if (!rctx->fpdu_part_rem) { + rctx->ddp_to += rctx->fpdu_part_rcvd; + return 0; + } + return -EAGAIN; + +error_term: + siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, DDP_ETYPE_CATASTROPHIC, + DDP_ECODE_CATASTROPHIC, 0); + return rv; +} + +int siw_proc_terminate(struct siw_qp *qp, struct siw_iwarp_rx *rctx) +{ + struct sk_buff *skb = rctx->skb; + struct iwarp_terminate *term = &rctx->hdr.terminate; + union iwarp_hdr term_info; + u8 *infop = (u8 *)&term_info; + enum rdma_opcode op; + u16 to_copy = sizeof(struct iwarp_ctrl); + + pr_info("siw: [QP %d]: got TERMINATE. layer %d, type %d, code %d\n", + QP_ID(qp), __rdmap_term_layer(term), __rdmap_term_etype(term), + __rdmap_term_ecode(term)); + + if (be32_to_cpu(term->ddp_qn) != RDMAP_UNTAGGED_QN_TERMINATE || + be32_to_cpu(term->ddp_msn) != + qp->rx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] || + be32_to_cpu(term->ddp_mo) != 0) { + pr_warn("siw: [QP %d]: received malformed TERM\n", QP_ID(qp)); + pr_warn(" [QN x%08x, MSN x%08x, MO x%08x]\n", + be32_to_cpu(term->ddp_qn), be32_to_cpu(term->ddp_msn), + be32_to_cpu(term->ddp_mo)); + return -ECONNRESET; + } + /* + * Receive remaining pieces of TERM if indicated + */ + if (!term->flag_m) + return -ECONNRESET; + + /* Do not take the effort to reassemble a network fragmented + * TERM message + */ + if (rctx->skb_new < sizeof(struct iwarp_ctrl_tagged)) + return -ECONNRESET; + + memset(infop, 0, sizeof(term_info)); + + skb_copy_bits(skb, rctx->skb_offset, infop, to_copy); + + op = __rdmap_opcode(&term_info.ctrl); + if (op >= RDMAP_TERMINATE) + goto out; + + infop += to_copy; + rctx->skb_offset += to_copy; + rctx->skb_new -= to_copy; + rctx->skb_copied += to_copy; + rctx->fpdu_part_rcvd += to_copy; + rctx->fpdu_part_rem -= to_copy; + + to_copy = iwarp_pktinfo[op].hdr_len - to_copy; + + /* Again, no network fragmented TERM's */ + if (to_copy + MPA_CRC_SIZE > rctx->skb_new) + return -ECONNRESET; + + skb_copy_bits(skb, rctx->skb_offset, infop, to_copy); + + if (term->flag_m) { + /* Adjust len to packet hdr print function */ + u32 mpa_len = be16_to_cpu(term_info.ctrl.mpa_len); + + mpa_len += iwarp_pktinfo[op].hdr_len - MPA_HDR_SIZE; + term_info.ctrl.mpa_len = cpu_to_be16(mpa_len); + } + if (term->flag_r) { + if (term->flag_m) + siw_print_hdr(&term_info, QP_ID(qp), + "TERMINATE reports RDMAP HDR (len valid): "); + else + siw_print_hdr(&term_info, QP_ID(qp), + "TERMINATE reports RDMAP HDR (len invalid): "); + } else if (term->flag_d) { + if (term->flag_m) + siw_print_hdr(&term_info, QP_ID(qp), + "TERMINATE reports DDP HDR (len valid): "); + else + siw_print_hdr(&term_info, QP_ID(qp), + "TERMINATE reports DDP HDR (len invalid): "); + } +out: + rctx->skb_new -= to_copy; + rctx->skb_offset += to_copy; + rctx->skb_copied += to_copy; + rctx->fpdu_part_rcvd += to_copy; + rctx->fpdu_part_rem -= to_copy; + + return -ECONNRESET; +} + +static int siw_get_trailer(struct siw_qp *qp, struct siw_iwarp_rx *rctx) +{ + struct sk_buff *skb = rctx->skb; + u8 *tbuf = (u8 *)&rctx->trailer.crc - rctx->pad; + int avail; + + avail = min(rctx->skb_new, rctx->fpdu_part_rem); + + siw_dbg_qp(qp, "expected %d, available %d, pad %d, skb_new %d\n", + rctx->fpdu_part_rem, avail, rctx->pad, rctx->skb_new); + + skb_copy_bits(skb, rctx->skb_offset, + tbuf + rctx->fpdu_part_rcvd, avail); + + rctx->fpdu_part_rcvd += avail; + rctx->fpdu_part_rem -= avail; + + rctx->skb_new -= avail; + rctx->skb_offset += avail; + rctx->skb_copied += avail; + + if (!rctx->fpdu_part_rem) { + __be32 crc_in, crc_own = 0; + /* + * check crc if required + */ + if (!rctx->mpa_crc_hd) + return 0; + + if (rctx->pad && siw_crc_array(rctx->mpa_crc_hd, + tbuf, rctx->pad) != 0) + return -EINVAL; + + crypto_shash_final(rctx->mpa_crc_hd, (u8 *)&crc_own); + + /* + * CRC32 is computed, transmitted and received directly in NBO, + * so there's never a reason to convert byte order. + */ + crc_in = rctx->trailer.crc; + + if (unlikely(crc_in != crc_own)) { + pr_warn("SIW: crc error. in: %08x, computed %08x\n", + crc_in, crc_own); + + siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, + LLP_ETYPE_MPA, + LLP_ECODE_RECEIVED_CRC, 0); + return -EINVAL; + } + return 0; + } + return -EAGAIN; +} + +#define MIN_DDP_HDR sizeof(struct iwarp_ctrl_tagged) + +static int siw_get_hdr(struct siw_iwarp_rx *rctx) +{ + struct sk_buff *skb = rctx->skb; + struct iwarp_ctrl *c_hdr = &rctx->hdr.ctrl; + u8 opcode; + + int bytes; + + if (rctx->fpdu_part_rcvd < MIN_DDP_HDR) { + /* + * copy a mimimum sized (tagged) DDP frame control part + */ + bytes = min_t(int, rctx->skb_new, MIN_DDP_HDR + - rctx->fpdu_part_rcvd); + + skb_copy_bits(skb, rctx->skb_offset, + (char *)c_hdr + rctx->fpdu_part_rcvd, bytes); + + rctx->fpdu_part_rcvd += bytes; + + rctx->skb_new -= bytes; + rctx->skb_offset += bytes; + rctx->skb_copied += bytes; + + if (rctx->fpdu_part_rcvd < MIN_DDP_HDR) + return -EAGAIN; + + if (unlikely(__ddp_version(c_hdr) != DDP_VERSION)) { + enum ddp_etype etype; + enum ddp_ecode ecode; + + pr_warn("SIW: received ddp version unsupported %d\n", + __ddp_version(c_hdr)); + + if (c_hdr->ddp_rdmap_ctrl & DDP_FLAG_TAGGED) { + etype = DDP_ETYPE_TAGGED_BUF; + ecode = DDP_ECODE_T_VERSION; + } else { + etype = DDP_ETYPE_UNTAGGED_BUF; + ecode = DDP_ECODE_UT_VERSION; + } + siw_init_terminate(rx_qp(rctx), TERM_ERROR_LAYER_DDP, + etype, ecode, 0); + return -EINVAL; + } + if (unlikely(__rdmap_version(c_hdr) != RDMAP_VERSION)) { + pr_warn("SIW: received rdmap version unsupported %d\n", + __rdmap_version(c_hdr)); + + siw_init_terminate(rx_qp(rctx), TERM_ERROR_LAYER_RDMAP, + RDMAP_ETYPE_REMOTE_OPERATION, + RDMAP_ECODE_VERSION, 0); + return -EINVAL; + } + opcode = __rdmap_opcode(c_hdr); + + if (opcode > RDMAP_TERMINATE) { + pr_warn("SIW: received unknown packet type %d\n", + opcode); + + siw_init_terminate(rx_qp(rctx), TERM_ERROR_LAYER_RDMAP, + RDMAP_ETYPE_REMOTE_OPERATION, + RDMAP_ECODE_OPCODE, 0); + return -EINVAL; + } + siw_dbg_qp(rx_qp(rctx), "new header, opcode %d\n", opcode); + } else { + opcode = __rdmap_opcode(c_hdr); + } + + /* + * Figure out len of current hdr: variable length of + * iwarp hdr may force us to copy hdr information in + * two steps. Only tagged DDP messages are already + * completely received. + */ + if (iwarp_pktinfo[opcode].hdr_len > sizeof(struct iwarp_ctrl_tagged)) { + bytes = iwarp_pktinfo[opcode].hdr_len - MIN_DDP_HDR; + + if (rctx->skb_new < bytes) + return -EAGAIN; + + skb_copy_bits(skb, rctx->skb_offset, + (char *)c_hdr + rctx->fpdu_part_rcvd, bytes); + + rctx->fpdu_part_rcvd += bytes; + + rctx->skb_new -= bytes; + rctx->skb_offset += bytes; + rctx->skb_copied += bytes; + } + /* + * DDP/RDMAP header receive completed. Check if the current + * DDP segment starts a new RDMAP message or continues a previously + * started RDMAP message. + * + * Note well from the comments on DDP reassembly: + * - Support for unordered reception of DDP segments + * (or FPDUs) from different RDMAP messages is not needed. + * - Unordered reception of DDP segments of the same + * RDMAP message is not supported. It is probably not + * needed with most peers. + */ + siw_dprint_hdr(&rctx->hdr, RX_QPID(rctx), "HDR received"); + + if (rctx->more_ddp_segs) { + rctx->first_ddp_seg = 0; + if (rctx->prev_rdmap_opcode != opcode) { + pr_warn("SIW: packet intersection: %d : %d\n", + rctx->prev_rdmap_opcode, opcode); + return -EPROTO; + } + } else { + rctx->prev_rdmap_opcode = opcode; + rctx->first_ddp_seg = 1; + } + rctx->more_ddp_segs = + c_hdr->ddp_rdmap_ctrl & DDP_FLAG_LAST ? 0 : 1; + + return 0; +} + +static inline int siw_fpdu_payload_len(struct siw_iwarp_rx *rctx) +{ + return be16_to_cpu(rctx->hdr.ctrl.mpa_len) - rctx->fpdu_part_rcvd + + MPA_HDR_SIZE; +} + +static inline int siw_fpdu_trailer_len(struct siw_iwarp_rx *rctx) +{ + int mpa_len = be16_to_cpu(rctx->hdr.ctrl.mpa_len) + MPA_HDR_SIZE; + + return MPA_CRC_SIZE + (-mpa_len & 0x3); +} + +static int siw_check_tx_fence(struct siw_qp *qp) +{ + struct siw_wqe *tx_waiting = tx_wqe(qp); + struct siw_sqe *rreq; + int resume_tx = 0, rv = 0; + unsigned long flags; + + spin_lock_irqsave(&qp->orq_lock, flags); + + rreq = orq_get_current(qp); + + /* free current orq entry */ + smp_store_mb(rreq->flags, 0); + + if (qp->tx_ctx.orq_fence) { + if (unlikely(tx_waiting->wr_status != SIW_WR_QUEUED)) { + pr_warn("SIW: [QP %d]: fence resume: bad status %d\n", + QP_ID(qp), tx_waiting->wr_status); + rv = -EPROTO; + goto out; + } + /* resume SQ processing */ + if (tx_waiting->sqe.opcode == SIW_OP_READ || + tx_waiting->sqe.opcode == SIW_OP_READ_LOCAL_INV) { + + rreq = orq_get_tail(qp); + if (unlikely(!rreq)) { + pr_warn("SIW: [QP %d]: no orqe\n", QP_ID(qp)); + rv = -EPROTO; + goto out; + } + siw_read_to_orq(rreq, &tx_waiting->sqe); + + qp->orq_put++; + qp->tx_ctx.orq_fence = 0; + resume_tx = 1; + + } else if (siw_orq_empty(qp)) { + qp->tx_ctx.orq_fence = 0; + resume_tx = 1; + } else { + pr_warn("SIW: [QP %d]: fence resume: orq idx: %d:%d\n", + QP_ID(qp), qp->orq_get, qp->orq_put); + rv = -EPROTO; + } + } + qp->orq_get++; +out: + spin_unlock_irqrestore(&qp->orq_lock, flags); + + if (resume_tx) + rv = siw_sq_start(qp); + + return rv; +} + +/* + * siw_rdmap_complete() + * + * Complete processing of an RDMA message after receiving all + * DDP segmens or ABort processing after encountering error case. + * + * o SENDs + RRESPs will need for completion, + * o RREQs need for READ RESPONSE initialization + * o WRITEs need memory dereferencing + * + * TODO: Failed WRITEs need local error to be surfaced. + */ +static inline int +siw_rdmap_complete(struct siw_qp *qp, int error) +{ + struct siw_iwarp_rx *rctx = &qp->rx_ctx; + struct siw_wqe *wqe = rx_wqe(qp); + enum siw_wc_status wc_status = wqe->wc_status; + + u8 opcode = __rdmap_opcode(&rctx->hdr.ctrl); + int rv = 0; + + switch (opcode) { + + case RDMAP_SEND_SE: + case RDMAP_SEND_SE_INVAL: + wqe->rqe.flags |= SIW_WQE_SOLICITED; + case RDMAP_SEND: + case RDMAP_SEND_INVAL: + if (wqe->wr_status == SIW_WR_IDLE) + break; + + rctx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]++; + + if (error != 0 && wc_status == SIW_WC_SUCCESS) + wc_status = SIW_WC_GENERAL_ERR; + /* + * Handle STag invalidation request + */ + if (wc_status == SIW_WC_SUCCESS && + (opcode == RDMAP_SEND_INVAL || + opcode == RDMAP_SEND_SE_INVAL)) { + rv = siw_invalidate_stag(qp->pd, rctx->inval_stag); + if (rv) { + siw_init_terminate(qp, + TERM_ERROR_LAYER_RDMAP, + rv == -EACCES ? + RDMAP_ETYPE_REMOTE_PROTECTION : + RDMAP_ETYPE_REMOTE_OPERATION, + RDMAP_ECODE_CANNOT_INVALIDATE, 0); + + wc_status = SIW_WC_REM_INV_REQ_ERR; + } + } + rv = siw_rqe_complete(qp, &wqe->rqe, wqe->processed, + wc_status); + siw_wqe_put_mem(wqe, SIW_OP_RECEIVE); + + break; + + case RDMAP_RDMA_READ_RESP: + if (wqe->wr_status == SIW_WR_IDLE) + break; + + if (error != 0) { + if (rctx->state == SIW_GET_HDR || error == -ENODATA) + /* eventual RREQ in ORQ left untouched */ + break; + + if (wc_status == SIW_WC_SUCCESS) + wc_status = SIW_WC_GENERAL_ERR; + } else if (qp->kernel_verbs && + rx_type(wqe) == SIW_OP_READ_LOCAL_INV) { + /* + * Handle any STag invalidation request + */ + rv = siw_invalidate_stag(qp->pd, wqe->sqe.sge[0].lkey); + if (rv) { + siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP, + RDMAP_ETYPE_CATASTROPHIC, + RDMAP_ECODE_UNSPECIFIED, 0); + + if (wc_status == SIW_WC_SUCCESS) { + wc_status = SIW_WC_GENERAL_ERR; + error = rv; + } + } + } + /* + * All errors turn the wqe into signalled. + */ + if ((wqe->sqe.flags & SIW_WQE_SIGNALLED) || error != 0) + rv = siw_sqe_complete(qp, &wqe->sqe, wqe->processed, + wc_status); + siw_wqe_put_mem(wqe, SIW_OP_READ); + + if (!error) + rv = siw_check_tx_fence(qp); + break; + + case RDMAP_RDMA_READ_REQ: + if (!error) { + rv = siw_init_rresp(qp, rctx); + rctx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ]++; + } + break; + + case RDMAP_RDMA_WRITE: + if (wqe->wr_status == SIW_WR_IDLE) + break; + + /* + * Free References from memory object if + * attached to receive context (inbound WRITE). + * While a zero-length WRITE is allowed, + * no memory reference got created. + */ + if (rx_mem(qp)) { + siw_mem_put(rx_mem(qp)); + rx_mem(qp) = NULL; + } + break; + + default: + break; + } + wqe->wr_status = SIW_WR_IDLE; + + return rv; +} + +/* + * siw_tcp_rx_data() + * + * Main routine to consume inbound TCP payload + * + * @rd_desc: read descriptor + * @skb: socket buffer + * @off: offset in skb + * @len: skb->len - offset : payload in skb + */ +int siw_tcp_rx_data(read_descriptor_t *rd_desc, struct sk_buff *skb, + unsigned int off, size_t len) +{ + struct siw_qp *qp = rd_desc->arg.data; + struct siw_iwarp_rx *rctx = &qp->rx_ctx; + int rv; + + rctx->skb = skb; + rctx->skb_new = skb->len - off; + rctx->skb_offset = off; + rctx->skb_copied = 0; + + siw_dbg_qp(qp, "new data, len %d\n", rctx->skb_new); + + while (rctx->skb_new) { + int run_completion = 1; + + if (unlikely(rctx->rx_suspend)) { + /* Do not process any more data */ + rctx->skb_copied += rctx->skb_new; + break; + } + switch (rctx->state) { + + case SIW_GET_HDR: + rv = siw_get_hdr(rctx); + if (!rv) { + if (rctx->mpa_crc_hd && + siw_crc_rxhdr(rctx) != 0) { + rv = -EINVAL; + break; + } + rctx->fpdu_part_rem = + siw_fpdu_payload_len(rctx); + + if (rctx->fpdu_part_rem) + rctx->pad = -rctx->fpdu_part_rem & 0x3; + else + rctx->pad = 0; + + rctx->state = SIW_GET_DATA_START; + rctx->fpdu_part_rcvd = 0; + } + break; + + case SIW_GET_DATA_MORE: + /* + * Another data fragment of the same DDP segment. + * Setting first_ddp_seg = 0 avoids repeating + * initializations that shall occur only once per + * DDP segment. + */ + rctx->first_ddp_seg = 0; + /* Fall through */ + + case SIW_GET_DATA_START: + /* + * Headers will be checked by the opcode-specific + * data receive function below. + */ + rv = siw_rx_data(qp, rctx); + if (!rv) { + rctx->fpdu_part_rem = + siw_fpdu_trailer_len(rctx); + rctx->fpdu_part_rcvd = 0; + rctx->state = SIW_GET_TRAILER; + } else { + if (unlikely(rv == -ECONNRESET)) + run_completion = 0; + else + rctx->state = SIW_GET_DATA_MORE; + } + break; + + case SIW_GET_TRAILER: + /* + * read CRC + any padding + */ + rv = siw_get_trailer(qp, rctx); + if (likely(!rv)) { + /* + * FPDU completed. + * complete RDMAP message if last fragment + */ + rctx->state = SIW_GET_HDR; + rctx->fpdu_part_rcvd = 0; + + if (!(rctx->hdr.ctrl.ddp_rdmap_ctrl + & DDP_FLAG_LAST)) + /* more frags */ + break; + + rv = siw_rdmap_complete(qp, 0); + run_completion = 0; + } + break; + + default: + pr_warn("QP[%d]: RX out of state\n", QP_ID(qp)); + rv = -EPROTO; + run_completion = 0; + } + + if (unlikely(rv != 0 && rv != -EAGAIN)) { + if (rctx->state > SIW_GET_HDR && run_completion) + siw_rdmap_complete(qp, rv); + + siw_dbg_qp(qp, "rx error %d, rx state %d\n", + rv, rctx->state); + + siw_qp_cm_drop(qp, 1); + + break; + } + if (rv) { + siw_dbg_qp(qp, "fpdu fragment, state %d, missing %d\n", + rctx->state, rctx->fpdu_part_rem); + break; + } + } + return rctx->skb_copied; +}