From: Gaurav Srivastava <gaurav.srivastava@xxxxxxxxxxxx>
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 <lkp@xxxxxxxxx>
Signed-off-by: Gaurav Srivastava <gaurav.srivastava@xxxxxxxxxxxx>
Signed-off-by: James Smart <jsmart2021@xxxxxxxxx>
---
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 <asm/unaligned.h>
#include <linux/t10-pi.h>
#include <linux/crc-t10dif.h>
+#include <linux/blk-cgroup.h>
#include <net/checksum.h>
#include <scsi/scsi.h>
@@ -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.
--
2.26.2
--
This electronic communication and the information and any files transmitted
with it, or attached to it, are confidential and are intended solely for
the use of the individual or entity to whom it is addressed and may contain
information that is confidential, legally privileged, protected by privacy
laws, or otherwise restricted from disclosure to anyone else. If you are
not the intended recipient or the person responsible for delivering the
e-mail to the intended recipient, you are hereby notified that any use,
copying, distributing, dissemination, forwarding, printing, or copying of
this e-mail is strictly prohibited. If you received this e-mail in error,
please return the e-mail to the sender, delete it from your computer, and
destroy any printed copy of it.
Attachment:
smime.p7s
Description: S/MIME Cryptographic Signature
