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[97.99.248.255]) by smtp.googlemail.com with ESMTPSA id v32sm3994677ooj.45.2022.01.27.13.38.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Jan 2022 13:38:23 -0800 (PST) From: Bob Pearson To: jgg@nvidia.com, zyjzyj2000@gmail.com, linux-rdma@vger.kernel.org Cc: Bob Pearson Subject: [RFC PATCH v9 26/26] RDMA/rxe: Replace mr by rkey in responder resources Date: Thu, 27 Jan 2022 15:37:55 -0600 Message-Id: <20220127213755.31697-27-rpearsonhpe@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220127213755.31697-1-rpearsonhpe@gmail.com> References: <20220127213755.31697-1-rpearsonhpe@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Currently rxe saves a copy of MR in responder resources for RDMA reads. Since the responder resources are never freed just over written if more are needed this MR may not have a reference freed until the QP is destroyed. This patch uses the rkey instead of the MR and on subsequent packets of a multipacket read reply message it looks up the MR from the rkey for each packet. This makes it possible for a user to deregister an MR or unbind a MW on the fly and get correct behaviour. Signed-off-by: Bob Pearson --- drivers/infiniband/sw/rxe/rxe_qp.c | 10 +-- drivers/infiniband/sw/rxe/rxe_resp.c | 123 ++++++++++++++++++-------- drivers/infiniband/sw/rxe/rxe_verbs.h | 1 - 3 files changed, 87 insertions(+), 47 deletions(-) diff --git a/drivers/infiniband/sw/rxe/rxe_qp.c b/drivers/infiniband/sw/rxe/rxe_qp.c index 742073ce0709..c595a140e893 100644 --- a/drivers/infiniband/sw/rxe/rxe_qp.c +++ b/drivers/infiniband/sw/rxe/rxe_qp.c @@ -135,12 +135,8 @@ static void free_rd_atomic_resources(struct rxe_qp *qp) void free_rd_atomic_resource(struct rxe_qp *qp, struct resp_res *res) { - if (res->type == RXE_ATOMIC_MASK) { + if (res->type == RXE_ATOMIC_MASK) kfree_skb(res->atomic.skb); - } else if (res->type == RXE_READ_MASK) { - if (res->read.mr) - rxe_drop_ref(res->read.mr); - } res->type = 0; } @@ -825,10 +821,8 @@ static void rxe_qp_do_cleanup(struct work_struct *work) if (qp->pd) rxe_drop_ref(qp->pd); - if (qp->resp.mr) { + if (qp->resp.mr) rxe_drop_ref(qp->resp.mr); - qp->resp.mr = NULL; - } if (qp_type(qp) == IB_QPT_RC) sk_dst_reset(qp->sk->sk); diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c index f589f4dde35c..c776289842e5 100644 --- a/drivers/infiniband/sw/rxe/rxe_resp.c +++ b/drivers/infiniband/sw/rxe/rxe_resp.c @@ -641,6 +641,78 @@ static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp, return skb; } +static struct resp_res *rxe_prepare_read_res(struct rxe_qp *qp, + struct rxe_pkt_info *pkt) +{ + struct resp_res *res; + u32 pkts; + + res = &qp->resp.resources[qp->resp.res_head]; + rxe_advance_resp_resource(qp); + free_rd_atomic_resource(qp, res); + + res->type = RXE_READ_MASK; + res->replay = 0; + res->read.va = qp->resp.va + qp->resp.offset; + res->read.va_org = qp->resp.va + qp->resp.offset; + res->read.resid = qp->resp.resid; + res->read.length = qp->resp.resid; + res->read.rkey = qp->resp.rkey; + + pkts = max_t(u32, (reth_len(pkt) + qp->mtu - 1)/qp->mtu, 1); + res->first_psn = pkt->psn; + res->cur_psn = pkt->psn; + res->last_psn = (pkt->psn + pkts - 1) & BTH_PSN_MASK; + + res->state = rdatm_res_state_new; + + return res; +} + +/** + * rxe_recheck_mr - revalidate MR from rkey and get a reference + * @qp: the qp + * @rkey: the rkey + * + * This code allows the MR to be invalidated or deregistered or + * the MW if one was used to be invalidated or deallocated. + * It is assumed that the access permissions if originally good + * are OK and the mappings to be unchanged. + * + * Return: mr on success else NULL + */ +static struct rxe_mr *rxe_recheck_mr(struct rxe_qp *qp, u32 rkey) +{ + struct rxe_dev *rxe = to_rdev(qp->ibqp.device); + struct rxe_mr *mr; + struct rxe_mw *mw; + + if (rkey_is_mw(rkey)) { + mw = rxe_pool_get_index(&rxe->mw_pool, rkey >> 8); + if (!mw || mw->rkey != rkey) + return NULL; + + if (mw->state != RXE_MW_STATE_VALID) { + rxe_drop_ref(mw); + return NULL; + } + + mr = mw->mr; + rxe_drop_ref(mw); + } else { + mr = rxe_pool_get_index(&rxe->mr_pool, rkey >> 8); + if (!mr || mr->rkey != rkey) + return NULL; + } + + if (mr->state != RXE_MR_STATE_VALID) { + rxe_drop_ref(mr); + return NULL; + } + + return mr; +} + /* RDMA read response. If res is not NULL, then we have a current RDMA request * being processed or replayed. */ @@ -655,53 +727,26 @@ static enum resp_states read_reply(struct rxe_qp *qp, int opcode; int err; struct resp_res *res = qp->resp.res; + struct rxe_mr *mr; if (!res) { - /* This is the first time we process that request. Get a - * resource - */ - res = &qp->resp.resources[qp->resp.res_head]; - - free_rd_atomic_resource(qp, res); - rxe_advance_resp_resource(qp); - - res->type = RXE_READ_MASK; - res->replay = 0; - - res->read.va = qp->resp.va + - qp->resp.offset; - res->read.va_org = qp->resp.va + - qp->resp.offset; - - res->first_psn = req_pkt->psn; - - if (reth_len(req_pkt)) { - res->last_psn = (req_pkt->psn + - (reth_len(req_pkt) + mtu - 1) / - mtu - 1) & BTH_PSN_MASK; - } else { - res->last_psn = res->first_psn; - } - res->cur_psn = req_pkt->psn; - - res->read.resid = qp->resp.resid; - res->read.length = qp->resp.resid; - res->read.rkey = qp->resp.rkey; - - /* note res inherits the reference to mr from qp */ - res->read.mr = qp->resp.mr; - qp->resp.mr = NULL; - - qp->resp.res = res; - res->state = rdatm_res_state_new; + res = rxe_prepare_read_res(qp, req_pkt); + qp->resp.res = res; } if (res->state == rdatm_res_state_new) { + mr = qp->resp.mr; + qp->resp.mr = NULL; + if (res->read.resid <= mtu) opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY; else opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST; } else { + mr = rxe_recheck_mr(qp, res->read.rkey); + if (!mr) + return RESPST_ERR_RKEY_VIOLATION; + if (res->read.resid > mtu) opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE; else @@ -717,10 +762,12 @@ static enum resp_states read_reply(struct rxe_qp *qp, if (!skb) return RESPST_ERR_RNR; - err = rxe_mr_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt), + err = rxe_mr_copy(mr, res->read.va, payload_addr(&ack_pkt), payload, RXE_FROM_MR_OBJ); if (err) pr_err("Failed copying memory\n"); + if (mr) + rxe_drop_ref(mr); if (bth_pad(&ack_pkt)) { u8 *pad = payload_addr(&ack_pkt) + payload; diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/sw/rxe/rxe_verbs.h index d70d44392c32..81996e5af079 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.h +++ b/drivers/infiniband/sw/rxe/rxe_verbs.h @@ -157,7 +157,6 @@ struct resp_res { struct sk_buff *skb; } atomic; struct { - struct rxe_mr *mr; u64 va_org; u32 rkey; u32 length;