From patchwork Tue Dec 22 00:11:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muneendra Kumar M X-Patchwork-Id: 11985981 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.2 required=3.0 tests=BAYES_00,DATE_IN_PAST_06_12, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D1E1C432C3 for ; Tue, 22 Dec 2020 07:07:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 09BB62313C for ; Tue, 22 Dec 2020 07:07:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726166AbgLVHG4 (ORCPT ); Tue, 22 Dec 2020 02:06:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56352 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726021AbgLVHGy (ORCPT ); Tue, 22 Dec 2020 02:06:54 -0500 Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 725B5C06179C for ; Mon, 21 Dec 2020 23:05:39 -0800 (PST) Received: by mail-pf1-x42b.google.com with SMTP id 11so7925325pfu.4 for ; Mon, 21 Dec 2020 23:05:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:from:to:cc:subject:date:message-id:in-reply-to :references; bh=/jszHKbLzcVNnvAr7iChXGiI5U4bXCIIDlhXe9bPC7k=; b=PAGY1FRVajafxMLaYouQfzODu6MD6sft9GrqSduQ4XQiAnmjyiQLRCX7xHGUOGpjs5 eQ+WiTZMfzhNNg//LSGixye+vhj1TDKvYISEsq0ozl2dlYEqu9c6YdeJCLfvl6cTw3h1 HErvFVpIo8V5/yjVkInWhb0Xx37lpya4+c9HY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :in-reply-to:references; bh=/jszHKbLzcVNnvAr7iChXGiI5U4bXCIIDlhXe9bPC7k=; b=Xk8wfT05nvejVHKu6M87vNEu4A6uGKt6C/l/S+Uk+DRyfyNobd6gpAuRiCyGcem/hQ zl62JGTxZriTuEX2iZrcFUv74t6/lP0MNRpzEUpL2vhAmJoosSedDYr5V+Kym2rRCdmu zD5DXWJALjm+p15ayi5ucpLHDsj83sTQYBZoMeBaqhS83iMLFko+f4wjNCbFBU7QCEy4 a6Nq8jOjMEi5hKC8XgaIHr5nxkyARZYP46iaaptSga/9v2WenUl8ZaLVxSNEgP/0lQgj XeaeqIPSfPiAonczFCN/tkIhq04FKt4Bri55Qi940xnSaRZF6cnnANAfEA8bADONmpS1 Z9TQ== MIME-Version: 1.0 X-Gm-Message-State: AOAM533g4caj6LextDlCNs2A9AiSwbt51bQi+DOarfXDqPdjJ+MCDnAf N7C4zOEQcXFJ2RaFPzSgfkhWzE0FMuEV+32CBmFH+lhHkuK67XGw55r0HoOfBFikN3XMUV3Hukl iEYM2WIfNr7o3 X-Google-Smtp-Source: ABdhPJw5IQ/AbCNo68Al4wzAcq/ykrVWoNAwIGdgYc256bVBFYPPyhuv3MFBNeh2SxFuk/AH/xkvPQ== X-Received: by 2002:a63:1860:: with SMTP id 32mr18822058pgy.390.1608620738690; Mon, 21 Dec 2020 23:05:38 -0800 (PST) Received: from localhost.localdomain ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id t9sm12466082pgh.41.2020.12.21.23.05.34 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 21 Dec 2020 23:05:38 -0800 (PST) From: Muneendra To: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, tj@kernel.org, linux-nvme@lists.infradead.org, hare@suse.de Cc: jsmart2021@gmail.com, emilne@redhat.com, mkumar@redhat.com, pbonzini@redhat.com, Gaurav Srivastava Subject: [PATCH v6 10/16] lpfc: vmid: Functions to manage vmids Date: Tue, 22 Dec 2020 05:41:52 +0530 Message-Id: <1608595918-21954-11-git-send-email-muneendra.kumar@broadcom.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1608595918-21954-1-git-send-email-muneendra.kumar@broadcom.com> References: <1608595918-21954-1-git-send-email-muneendra.kumar@broadcom.com> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Gaurav Srivastava This patch contains the routines to save, retrieve and remove the vmids from the data structure. A hash table is used to save the vmids and the corresponding UUIDs associated with the application/VMs. Reported-by: kernel test robot Signed-off-by: Gaurav Srivastava Signed-off-by: James Smart --- v6: Added Forward declarations and functions to static v5: Changed Return code to non-numeric/Symbol v4: No change v3: No change v2: Ported the patch on top of 5.10/scsi-queue --- drivers/scsi/lpfc/lpfc_scsi.c | 148 ++++++++++++++++++++++++++++++++++ 1 file changed, 148 insertions(+) diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index b79b6f03cdb6..53baee21e0f9 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -86,6 +87,14 @@ static void lpfc_release_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_io_buf *psb); static int lpfc_prot_group_type(struct lpfc_hba *phba, struct scsi_cmnd *sc); +static int +lpfc_put_vmid_in_hashtable(struct lpfc_vport *vport, u32 hash, + struct lpfc_vmid *vmp); +static void lpfc_vmid_update_entry(struct lpfc_vport *vport, struct scsi_cmnd + *cmd, struct lpfc_vmid *vmp, + union lpfc_vmid_io_tag *tag); +static void lpfc_vmid_assign_cs_ctl(struct lpfc_vport *vport, + struct lpfc_vmid *vmid); static inline unsigned lpfc_cmd_blksize(struct scsi_cmnd *sc) @@ -5131,6 +5140,145 @@ void lpfc_poll_timeout(struct timer_list *t) } } +/* + * lpfc_get_vmid_from_hastable - search the UUID in the hash table + * @vport: The virtual port for which this call is being executed. + * @hash: calculated hash value + * @buf: uuid associated with the VE + * Returns the vmid entry associated with the UUID + * Make sure to acquire the appropriate lock before invoking this routine. + */ +struct lpfc_vmid *lpfc_get_vmid_from_hastable(struct lpfc_vport *vport, + u32 hash, u8 *buf) +{ + struct lpfc_vmid *vmp; + u16 count = 0; + + while (count < LPFC_VMID_HASH_SIZE) { + vmp = vport->hash_table[hash]; + if (vmp) { + if (strncmp(&vmp->host_vmid[0], buf, 16) == 0) + return vmp; + } else { + return NULL; + } + /* search the next available slot and continue till entry */ + /* is found */ + count++; + hash++; + + /* or the end is reached */ + if (hash == LPFC_VMID_HASH_SIZE) + hash = 0; + } + return NULL; +} + +/* + * lpfc_put_vmid_from_hastable - put the VMID in the hash table + * @vport: The virtual port for which this call is being executed. + * @hash - calculated hash value + * @vmp: Pointer to a VMID entry representing a VM sending IO + * + * This routine will insert the newly acquired vmid entity in the hash table. + * Make sure to acquire the appropriate lock before invoking this routine. + */ +static int +lpfc_put_vmid_in_hashtable(struct lpfc_vport *vport, u32 hash, + struct lpfc_vmid *vmp) +{ + int count = 0; + + while (count < LPFC_VMID_HASH_SIZE) { + if (!vport->hash_table[hash]) { + vport->hash_table[hash] = vmp; + vmp->hash_index = hash; + return FAILURE; + } + /* if the slot is already occupied, a collision has occurred. */ + /* Store in the next available slot */ + count++; + hash++; + /* table is full */ + if (hash == LPFC_VMID_HASH_SIZE) + hash = 0; + } + return 0; +} + +/* + * lpfc_vmid_hash_fn- creates a hash value of the UUID + * @uuid: uuid associated with the VE + * @len: length of the UUID + * Returns the calculated hash value + */ +int lpfc_vmid_hash_fn(char *vmid, int len) +{ + int c; + int hash = 0; + + if (len == 0) + return 0; + while (len--) { + c = *vmid++; + if (c >= 'A' && c <= 'Z') + c += 'a' - 'A'; + + hash = (hash + (c << LPFC_VMID_HASH_SHIFT) + + (c >> LPFC_VMID_HASH_SHIFT)) * 19; + } + + return hash & LPFC_VMID_HASH_MASK; +} + +/* + * lpfc_vmid_update_entry - update the vmid entry in the hash table + * @vport: The virtual port for which this call is being executed. + * @cmd: address of scsi cmmd descriptor + * @vmp: Pointer to a VMID entry representing a VM sending IO + * @tag: VMID tag + */ +static void lpfc_vmid_update_entry(struct lpfc_vport *vport, struct scsi_cmnd + *cmd, struct lpfc_vmid *vmp, + union lpfc_vmid_io_tag *tag) +{ + u64 *lta; + + if (vport->vmid_priority_tagging) + tag->cs_ctl_vmid = vmp->un.cs_ctl_vmid; + else + tag->app_id = vmp->un.app_id; + + if (cmd->sc_data_direction == DMA_TO_DEVICE) + vmp->io_wr_cnt++; + else + vmp->io_rd_cnt++; + + /* update the last access timestamp in the table */ + lta = per_cpu_ptr(vmp->last_io_time, raw_smp_processor_id()); + *lta = jiffies; +} + +static void lpfc_vmid_assign_cs_ctl(struct lpfc_vport *vport, + struct lpfc_vmid *vmid) +{ + u32 hash; + struct lpfc_vmid *pvmid; + + if (vport->port_type == LPFC_PHYSICAL_PORT) { + vmid->un.cs_ctl_vmid = lpfc_vmid_get_cs_ctl(vport); + } else { + hash = lpfc_vmid_hash_fn(vmid->host_vmid, vmid->vmid_len); + pvmid = + lpfc_get_vmid_from_hastable(vport->phba->pport, hash, + vmid->host_vmid); + if (!pvmid) + vmid->un.cs_ctl_vmid = pvmid->un.cs_ctl_vmid; + else + vmid->un.cs_ctl_vmid = lpfc_vmid_get_cs_ctl(vport); + } +} + /** * lpfc_queuecommand - scsi_host_template queuecommand entry point * @shost: kernel scsi host pointer.