From patchwork Mon Sep 23 06:29:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Honggang LI X-Patchwork-Id: 11156079 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B5ACA76 for ; Mon, 23 Sep 2019 06:30:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 946E320882 for ; Mon, 23 Sep 2019 06:30:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403860AbfIWGaS (ORCPT ); Mon, 23 Sep 2019 02:30:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42214 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387519AbfIWGaS (ORCPT ); Mon, 23 Sep 2019 02:30:18 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 6EC5B18C427A; Mon, 23 Sep 2019 06:30:18 +0000 (UTC) Received: from dhcp-128-227.nay.redhat.com (unknown [10.66.128.227]) by smtp.corp.redhat.com (Postfix) with ESMTP id 814B019C58; Mon, 23 Sep 2019 06:30:16 +0000 (UTC) From: Honggang LI To: bvanassche@acm.org, dledford@redhat.com, jgg@ziepe.ca Cc: linux-rdma@vger.kernel.org, Honggang Li Subject: [patch v4 1/2] RDMA/srp: Add parse function for maximum initiator to target IU size Date: Mon, 23 Sep 2019 14:29:39 +0800 Message-Id: <20190923062940.12330-1-honli@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.62]); Mon, 23 Sep 2019 06:30:18 +0000 (UTC) Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Honggang Li According to SRP specifications 'srp-r16a' and 'srp2r06', IOControllerProfile attributes for SRP target port include the maximum initiator to target IU size. SRP connection daemons, such as srp_daemon, can get the value from subnet manager. The SRP connection daemon can pass this value to kernel. This patch add parse function for it. Upstream commit [1] enables the kernel parameter, 'use_imm_data', by default. [1] also use (8 * 1024) as the default value for kernel parameter 'max_imm_data'. With those default values, the maximum initiator to target IU size will be 8260. In case the SRPT modules, which include the in-tree 'ib_srpt.ko' module, do not support SRP-2 'immediate data' feature, the default maximum initiator to target IU size is significantly smaller than 8260. For 'ib_srpt.ko' module, which built from source before [2], the default maximum initiator to target IU is 2116. [1] introduces a regression issue for old srp target with default kernel parameters, as the connection will be reject because of too large maximum initiator to target IU size. [1] commit 882981f4a411 ("RDMA/srp: Add support for immediate data") [2] commit 5dabcd0456d7 ("RDMA/srpt: Add support for immediate data") Reviewed-by: Bart Van Assche Signed-off-by: Honggang Li --- Documentation/ABI/stable/sysfs-driver-ib_srp | 2 ++ drivers/infiniband/ulp/srp/ib_srp.c | 10 ++++++++++ drivers/infiniband/ulp/srp/ib_srp.h | 1 + 3 files changed, 13 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-driver-ib_srp b/Documentation/ABI/stable/sysfs-driver-ib_srp index 7049a2b50359..84972a57caae 100644 --- a/Documentation/ABI/stable/sysfs-driver-ib_srp +++ b/Documentation/ABI/stable/sysfs-driver-ib_srp @@ -67,6 +67,8 @@ Description: Interface for making ib_srp connect to a new target. initiator is allowed to queue per SCSI host. The default value for this parameter is 62. The lowest supported value is 2. + * max_it_iu_size, a decimal number specifying the maximum + initiator to target information unit length. What: /sys/class/infiniband_srp/srp--/ibdev Date: January 2, 2006 diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index b5960351bec0..b829dab0df77 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -3411,6 +3411,7 @@ enum { SRP_OPT_IP_SRC = 1 << 15, SRP_OPT_IP_DEST = 1 << 16, SRP_OPT_TARGET_CAN_QUEUE= 1 << 17, + SRP_OPT_MAX_IT_IU_SIZE = 1 << 18, }; static unsigned int srp_opt_mandatory[] = { @@ -3443,6 +3444,7 @@ static const match_table_t srp_opt_tokens = { { SRP_OPT_QUEUE_SIZE, "queue_size=%d" }, { SRP_OPT_IP_SRC, "src=%s" }, { SRP_OPT_IP_DEST, "dest=%s" }, + { SRP_OPT_MAX_IT_IU_SIZE, "max_it_iu_size=%d" }, { SRP_OPT_ERR, NULL } }; @@ -3736,6 +3738,14 @@ static int srp_parse_options(struct net *net, const char *buf, target->tl_retry_count = token; break; + case SRP_OPT_MAX_IT_IU_SIZE: + if (match_int(args, &token) || token < 0) { + pr_warn("bad maximum initiator to target IU size '%s'\n", p); + goto out; + } + target->max_it_iu_size = token; + break; + default: pr_warn("unknown parameter or missing value '%s' in target creation request\n", p); diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h index b2861cd2087a..105b2bc6aa2f 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.h +++ b/drivers/infiniband/ulp/srp/ib_srp.h @@ -209,6 +209,7 @@ struct srp_target_port { u32 ch_count; u32 lkey; enum srp_target_state state; + uint32_t max_it_iu_size; unsigned int cmd_sg_cnt; unsigned int indirect_size; bool allow_ext_sg; From patchwork Mon Sep 23 06:29:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Honggang LI X-Patchwork-Id: 11156081 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1658B76 for ; Mon, 23 Sep 2019 06:30:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F0E7120640 for ; Mon, 23 Sep 2019 06:30:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393210AbfIWGaV (ORCPT ); Mon, 23 Sep 2019 02:30:21 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48334 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387519AbfIWGaV (ORCPT ); Mon, 23 Sep 2019 02:30:21 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A8F33308FC20; Mon, 23 Sep 2019 06:30:20 +0000 (UTC) Received: from dhcp-128-227.nay.redhat.com (unknown [10.66.128.227]) by smtp.corp.redhat.com (Postfix) with ESMTP id DFF7319C78; Mon, 23 Sep 2019 06:30:18 +0000 (UTC) From: Honggang LI To: bvanassche@acm.org, dledford@redhat.com, jgg@ziepe.ca Cc: linux-rdma@vger.kernel.org, Honggang Li Subject: [patch v4 2/2] RDMA/srp: calculate max_it_iu_size if remote max_it_iu length available Date: Mon, 23 Sep 2019 14:29:40 +0800 Message-Id: <20190923062940.12330-2-honli@redhat.com> In-Reply-To: <20190923062940.12330-1-honli@redhat.com> References: <20190923062940.12330-1-honli@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Mon, 23 Sep 2019 06:30:20 +0000 (UTC) Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Honggang Li The default maximum immediate size is too big for old srp clients, which do not support immediate data. According to the SRP and SRP-2 specifications, the IOControllerProfile attributes for SRP target ports contains the maximum initiator to target iu length. The maximum initiator to target iu length can be retrieved from the subnet manager, such as opensm and opafm. We should calculate the max_it_iu_size instead of the default value, when remote maximum initiator to target iu length available. Reviewed-by: Bart Van Assche Signed-off-by: Honggang Li --- drivers/infiniband/ulp/srp/ib_srp.c | 28 ++++++++++++++++++++-------- 1 file changed, 20 insertions(+), 8 deletions(-) diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index b829dab0df77..b3bf5d552de9 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -139,7 +139,7 @@ MODULE_PARM_DESC(use_imm_data, static unsigned int srp_max_imm_data = 8 * 1024; module_param_named(max_imm_data, srp_max_imm_data, uint, 0644); -MODULE_PARM_DESC(max_imm_data, "Maximum immediate data size."); +MODULE_PARM_DESC(max_imm_data, "Maximum immediate data size if max_it_iu_size has not been specified."); static unsigned ch_count; module_param(ch_count, uint, 0444); @@ -1362,15 +1362,23 @@ static void srp_terminate_io(struct srp_rport *rport) } /* Calculate maximum initiator to target information unit length. */ -static uint32_t srp_max_it_iu_len(int cmd_sg_cnt, bool use_imm_data) +static uint32_t srp_max_it_iu_len(int cmd_sg_cnt, bool use_imm_data, + uint32_t max_it_iu_size) { uint32_t max_iu_len = sizeof(struct srp_cmd) + SRP_MAX_ADD_CDB_LEN + sizeof(struct srp_indirect_buf) + cmd_sg_cnt * sizeof(struct srp_direct_buf); - if (use_imm_data) - max_iu_len = max(max_iu_len, SRP_IMM_DATA_OFFSET + - srp_max_imm_data); + if (use_imm_data) { + if (max_it_iu_size == 0) { + max_iu_len = max(max_iu_len, + SRP_IMM_DATA_OFFSET + srp_max_imm_data); + } else { + max_iu_len = max_it_iu_size; + } + } + + pr_debug("max_iu_len = %d\n", max_iu_len); return max_iu_len; } @@ -1389,7 +1397,8 @@ static int srp_rport_reconnect(struct srp_rport *rport) struct srp_target_port *target = rport->lld_data; struct srp_rdma_ch *ch; uint32_t max_iu_len = srp_max_it_iu_len(target->cmd_sg_cnt, - srp_use_imm_data); + srp_use_imm_data, + target->max_it_iu_size); int i, j, ret = 0; bool multich = false; @@ -2538,7 +2547,8 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id, ch->req_lim = be32_to_cpu(lrsp->req_lim_delta); ch->use_imm_data = lrsp->rsp_flags & SRP_LOGIN_RSP_IMMED_SUPP; ch->max_it_iu_len = srp_max_it_iu_len(target->cmd_sg_cnt, - ch->use_imm_data); + ch->use_imm_data, + target->max_it_iu_size); WARN_ON_ONCE(ch->max_it_iu_len > be32_to_cpu(lrsp->max_it_iu_len)); @@ -3897,7 +3907,9 @@ static ssize_t srp_create_target(struct device *dev, target->mr_per_cmd = mr_per_cmd; target->indirect_size = target->sg_tablesize * sizeof (struct srp_direct_buf); - max_iu_len = srp_max_it_iu_len(target->cmd_sg_cnt, srp_use_imm_data); + max_iu_len = srp_max_it_iu_len(target->cmd_sg_cnt, + srp_use_imm_data, + target->max_it_iu_size); INIT_WORK(&target->tl_err_work, srp_tl_err_work); INIT_WORK(&target->remove_work, srp_remove_work);