From patchwork Tue Sep 19 14:41:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Gu X-Patchwork-Id: 13391554 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D63C3AC0E for ; Tue, 19 Sep 2023 14:43:24 +0000 (UTC) Received: from out30-111.freemail.mail.aliyun.com (out30-111.freemail.mail.aliyun.com [115.124.30.111]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9A409E47; Tue, 19 Sep 2023 07:43:12 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R111e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045176;MF=guwen@linux.alibaba.com;NM=1;PH=DS;RN=13;SR=0;TI=SMTPD_---0VsRsS-6_1695134585; Received: from localhost(mailfrom:guwen@linux.alibaba.com fp:SMTPD_---0VsRsS-6_1695134585) by smtp.aliyun-inc.com; Tue, 19 Sep 2023 22:43:06 +0800 From: Wen Gu To: kgraul@linux.ibm.com, wenjia@linux.ibm.com, jaka@linux.ibm.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: alibuda@linux.alibaba.com, tonylu@linux.alibaba.com, guwen@linux.alibaba.com, linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next 15/18] net/smc: add operations for DMB attach and detach Date: Tue, 19 Sep 2023 22:41:59 +0800 Message-Id: <1695134522-126655-16-git-send-email-guwen@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1695134522-126655-1-git-send-email-guwen@linux.alibaba.com> References: <1695134522-126655-1-git-send-email-guwen@linux.alibaba.com> X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: X-Patchwork-Delegate: kuba@kernel.org This patch extends smcd_ops, adding two more semantic for SMC-D DMB: - attach_dmb: Attach an already registered DMB to a specific buf_desc, so that we can refer to the DMB through this buf_desc. - detach_dmb: Reverse operation of attach_dmb. detach the DMB from the buf_desc. This interface extension is to prepare for the avoidance of memory copy from sndbuf to RMB with SMC-D device whose DMBs has ISM_ATTR_DMB_MAP attribute. Signed-off-by: Wen Gu --- include/net/smc.h | 2 ++ net/smc/smc_ism.c | 31 +++++++++++++++++++++++++++++++ net/smc/smc_ism.h | 2 ++ 3 files changed, 35 insertions(+) diff --git a/include/net/smc.h b/include/net/smc.h index 6930c8a..04dbaa4 100644 --- a/include/net/smc.h +++ b/include/net/smc.h @@ -72,6 +72,8 @@ struct smcd_ops { int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb, void *client); int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb); + int (*attach_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb); + int (*detach_dmb)(struct smcd_dev *dev, u64 token); int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id); int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id); int (*set_vlan_required)(struct smcd_dev *dev); diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c index 14e018c..0c20745 100644 --- a/net/smc/smc_ism.c +++ b/net/smc/smc_ism.c @@ -244,6 +244,37 @@ int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len, return rc; } +int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token, + struct smc_buf_desc *dmb_desc) +{ + struct smcd_dmb dmb; + int rc = 0; + + memset(&dmb, 0, sizeof(dmb)); + dmb.dmb_tok = token; + + if (!dev->ops->attach_dmb) + return -EINVAL; + + rc = dev->ops->attach_dmb(dev, &dmb); + if (!rc) { + dmb_desc->sba_idx = dmb.sba_idx; + dmb_desc->token = dmb.dmb_tok; + dmb_desc->cpu_addr = dmb.cpu_addr; + dmb_desc->dma_addr = dmb.dma_addr; + dmb_desc->len = dmb.dmb_len; + } + return rc; +} + +int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token) +{ + if (!dev->ops->detach_dmb) + return -EINVAL; + + return dev->ops->detach_dmb(dev, token); +} + static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd, struct sk_buff *skb, struct netlink_callback *cb) diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h index cef212c..f30aae4 100644 --- a/net/smc/smc_ism.h +++ b/net/smc/smc_ism.h @@ -45,6 +45,8 @@ int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size, struct smc_buf_desc *dmb_desc); int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc); bool smc_ism_dmb_mappable(struct smcd_dev *smcd); +int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token, struct smc_buf_desc *dmb_desc); +int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token); int smc_ism_signal_shutdown(struct smc_link_group *lgr); void smc_ism_get_system_eid(u8 **eid); u16 smc_ism_get_chid(struct smcd_dev *dev);