From patchwork Thu Mar 4 05:27:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muneendra Kumar X-Patchwork-Id: 394053 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=unavailable 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 E379DC43331 for ; Thu, 4 Mar 2021 12:30:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CA8E064F39 for ; Thu, 4 Mar 2021 12:30:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240656AbhCDM3j (ORCPT ); Thu, 4 Mar 2021 07:29:39 -0500 Received: from relay.smtp-ext.broadcom.com ([192.19.221.30]:40566 "EHLO relay.smtp-ext.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240628AbhCDM3F (ORCPT ); Thu, 4 Mar 2021 07:29:05 -0500 Received: from localhost.localdomain (unknown [10.157.2.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by relay.smtp-ext.broadcom.com (Postfix) with ESMTPS id 514E222591; Thu, 4 Mar 2021 04:20:00 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 relay.smtp-ext.broadcom.com 514E222591 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=broadcom.com; s=dkimrelay; t=1614860400; bh=ioo9ZoDD07YFWG80mkLyfdUCx7HBVgKQBewcx0HE3uc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nx3+XJYPGeIBZpM6gn8ctkea07PU9AeIxWeqWSwXTCHSwd7oYjGGu6AnCZXHQ02x8 YL9nzJagvJ3bUKPoyL+hJwnLF2FnBj2ufG//dY4bx3fjtBRRWIlEoNpzWnvVF0hjwc cOVw6UDzIzhc/y0tHijjXZ77UKd2XdG/RA6PTeVs= 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, Gaurav Srivastava Subject: [PATCH v8 10/16] lpfc: vmid: Functions to manage vmids Date: Thu, 4 Mar 2021 10:57:20 +0530 Message-Id: <1614835646-16217-11-git-send-email-muneendra.kumar@broadcom.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1614835646-16217-1-git-send-email-muneendra.kumar@broadcom.com> References: <1614835646-16217-1-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. Signed-off-by: Gaurav Srivastava Signed-off-by: James Smart --- v8: Added correct return value and error codes v7: No change 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 e96e767faa2a..b71602878559 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 0; + } + /* 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 -ENOMEM; +} + +/* + * lpfc_vmid_hash_fn - creates a hash value of the UUID + * @vmid: uuid associated with the VE + * @len: length of the vmid string + * Returns the calculated hash value + */ +int lpfc_vmid_hash_fn(const 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.