From patchwork Fri Oct 6 21:42:42 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bart Van Assche X-Patchwork-Id: 9990487 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 6F5326020F for ; Fri, 6 Oct 2017 21:43:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 61BA028E17 for ; Fri, 6 Oct 2017 21:43:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 56E8228E20; Fri, 6 Oct 2017 21:43:45 +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 D6EF028E21 for ; Fri, 6 Oct 2017 21:43:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752892AbdJFVnk (ORCPT ); Fri, 6 Oct 2017 17:43:40 -0400 Received: from esa4.hgst.iphmx.com ([216.71.154.42]:41532 "EHLO esa4.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752878AbdJFVnj (ORCPT ); Fri, 6 Oct 2017 17:43:39 -0400 X-IronPort-AV: E=Sophos;i="5.42,486,1500912000"; d="scan'208";a="56490321" Received: from sjappemgw12.hgst.com (HELO sjappemgw11.hgst.com) ([199.255.44.66]) by ob1.hgst.iphmx.com with ESMTP; 07 Oct 2017 05:43:39 +0800 Received: from thinkpad-bart.sdcorp.global.sandisk.com (HELO thinkpad-bart.int.fusionio.com) ([10.11.172.152]) by sjappemgw11.hgst.com with ESMTP; 06 Oct 2017 14:42:43 -0700 From: Bart Van Assche To: Doug Ledford Cc: linux-rdma@vger.kernel.org, Bart Van Assche Subject: [PATCH 6/7] IB/srp: Cache global rkey Date: Fri, 6 Oct 2017 14:42:42 -0700 Message-Id: <20171006214243.11296-7-bart.vanassche@wdc.com> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171006214243.11296-1-bart.vanassche@wdc.com> References: <20171006214243.11296-1-bart.vanassche@wdc.com> 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 This is a micro-optimization for the hot path. Signed-off-by: Bart Van Assche --- drivers/infiniband/ulp/srp/ib_srp.c | 27 ++++++++++++++------------- drivers/infiniband/ulp/srp/ib_srp.h | 3 ++- 2 files changed, 16 insertions(+), 14 deletions(-) diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index 96750ad253c4..463c3ed440eb 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -1292,7 +1292,6 @@ static int srp_map_finish_fmr(struct srp_map_state *state, { struct srp_target_port *target = ch->target; struct srp_device *dev = target->srp_host->srp_dev; - struct ib_pd *pd = target->pd; struct ib_pool_fmr *fmr; u64 io_addr = 0; @@ -1308,9 +1307,9 @@ static int srp_map_finish_fmr(struct srp_map_state *state, if (state->npages == 0) return 0; - if (state->npages == 1 && (pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)) { + if (state->npages == 1 && target->global_rkey) { srp_map_desc(state, state->base_dma_addr, state->dma_len, - pd->unsafe_global_rkey); + target->global_rkey); goto reset_state; } @@ -1350,7 +1349,6 @@ static int srp_map_finish_fr(struct srp_map_state *state, { struct srp_target_port *target = ch->target; struct srp_device *dev = target->srp_host->srp_dev; - struct ib_pd *pd = target->pd; struct ib_send_wr *bad_wr; struct ib_reg_wr wr; struct srp_fr_desc *desc; @@ -1366,12 +1364,12 @@ static int srp_map_finish_fr(struct srp_map_state *state, WARN_ON_ONCE(!dev->use_fast_reg); - if (sg_nents == 1 && (pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)) { + if (sg_nents == 1 && target->global_rkey) { unsigned int sg_offset = sg_offset_p ? *sg_offset_p : 0; srp_map_desc(state, sg_dma_address(state->sg) + sg_offset, sg_dma_len(state->sg) - sg_offset, - pd->unsafe_global_rkey); + target->global_rkey); if (sg_offset_p) *sg_offset_p = 0; return 1; @@ -1533,7 +1531,7 @@ static int srp_map_sg_dma(struct srp_map_state *state, struct srp_rdma_ch *ch, for_each_sg(scat, sg, count, i) { srp_map_desc(state, ib_sg_dma_address(dev->dev, sg), ib_sg_dma_len(dev->dev, sg), - target->pd->unsafe_global_rkey); + target->global_rkey); } return 0; @@ -1631,7 +1629,6 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch, struct srp_request *req) { struct srp_target_port *target = ch->target; - struct ib_pd *pd = target->pd; struct scatterlist *scat; struct srp_cmd *cmd = req->cmd->buf; int len, nents, count, ret; @@ -1667,7 +1664,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch, fmt = SRP_DATA_DESC_DIRECT; len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); - if (count == 1 && (pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)) { + if (count == 1 && target->global_rkey) { /* * The midlayer only generated a single gather/scatter * entry, or DMA mapping coalesced everything to a @@ -1677,7 +1674,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch, struct srp_direct_buf *buf = (void *) cmd->add_data; buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); - buf->key = cpu_to_be32(pd->unsafe_global_rkey); + buf->key = cpu_to_be32(target->global_rkey); buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); req->nmdesc = 0; @@ -1748,14 +1745,14 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch, memcpy(indirect_hdr->desc_list, req->indirect_desc, count * sizeof (struct srp_direct_buf)); - if (!(pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)) { + if (!target->global_rkey) { ret = srp_map_idb(ch, req, state.gen.next, state.gen.end, idb_len, &idb_rkey); if (ret < 0) goto unmap; req->nmdesc++; } else { - idb_rkey = cpu_to_be32(pd->unsafe_global_rkey); + idb_rkey = cpu_to_be32(target->global_rkey); } indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr); @@ -3331,8 +3328,8 @@ static ssize_t srp_create_target(struct device *dev, target->io_class = SRP_REV16A_IB_IO_CLASS; target->scsi_host = target_host; target->srp_host = host; - target->pd = host->srp_dev->pd; target->lkey = host->srp_dev->pd->local_dma_lkey; + target->global_rkey = host->srp_dev->global_rkey; target->cmd_sg_cnt = cmd_sg_entries; target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries; target->allow_ext_sg = allow_ext_sg; @@ -3651,6 +3648,10 @@ static void srp_add_one(struct ib_device *device) if (IS_ERR(srp_dev->pd)) goto free_dev; + if (flags & IB_PD_UNSAFE_GLOBAL_RKEY) { + srp_dev->global_rkey = srp_dev->pd->unsafe_global_rkey; + WARN_ON_ONCE(srp_dev->global_rkey == 0); + } for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) { host = srp_add_port(srp_dev, p); diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h index ab9077b81d5a..a814f5ef16f9 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.h +++ b/drivers/infiniband/ulp/srp/ib_srp.h @@ -90,6 +90,7 @@ struct srp_device { struct list_head dev_list; struct ib_device *dev; struct ib_pd *pd; + u32 global_rkey; u64 mr_page_mask; int mr_page_size; int mr_max_size; @@ -179,7 +180,7 @@ struct srp_target_port { spinlock_t lock; /* read only in the hot path */ - struct ib_pd *pd; + u32 global_rkey; struct srp_rdma_ch *ch; u32 ch_count; u32 lkey;