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be2iscsi: Fix WRB leak in login/logout path 

Login/Logout loop was hanging after few hours. /var/log/message showed
that alloc_wrb_handle() function was not able to allocate any new WRB.

Sep 11 11:25:22 Jhelum10 kernel: connection32513:0: Could not send nopout
Sep 11 11:25:22 Jhelum10 kernel: scsi host10: BM_4989 : Alloc of WRB_HANDLE
Failed for the CID : 384
Sep 11 11:25:22 Jhelum10 kernel: connection32513:0: Could not allocate pdu for
mgmt task.

Driver allocates WRB to pass login negotiated parameters information to FW
in beiscsi_offload_connection(). This allocated WRB was not freed so there
was WRB_Leak happening.

Put WRB used for posting the login-negotiated parameters back in pool.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@avagotech.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Jitendra Bhivare 2016-01-20 14:11:00 +05:30 committed by Martin K. Petersen
parent 9c4f8b0173
commit cb564c6b44
1 changed files with 49 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
drivers/scsi/be2iscsi/be_main.c
View File

@ -1180,6 +1180,22 @@ free_io_sgl_handle(struct beiscsi_hba *phba, struct sgl_handle *psgl_handle)
phba->io_sgl_free_index++;
}
static inline struct wrb_handle *
beiscsi_get_wrb_handle(struct hwi_wrb_context *pwrb_context,
unsigned int wrbs_per_cxn)
{
struct wrb_handle *pwrb_handle;
pwrb_handle = pwrb_context->pwrb_handle_base[pwrb_context->alloc_index];
pwrb_context->wrb_handles_available--;
if (pwrb_context->alloc_index == (wrbs_per_cxn - 1))
pwrb_context->alloc_index = 0;
else
pwrb_context->alloc_index++;
return pwrb_handle;
}
/**
* alloc_wrb_handle - To allocate a wrb handle
* @phba: The hba pointer
@ -1189,30 +1205,30 @@ free_io_sgl_handle(struct beiscsi_hba *phba, struct sgl_handle *psgl_handle)
* This happens under session_lock until submission to chip
*/
struct wrb_handle *alloc_wrb_handle(struct beiscsi_hba *phba, unsigned int cid,
struct hwi_wrb_context **pcontext)
struct hwi_wrb_context **pcontext)
{
struct hwi_wrb_context *pwrb_context;
struct hwi_controller *phwi_ctrlr;
struct wrb_handle *pwrb_handle;
uint16_t cri_index = BE_GET_CRI_FROM_CID(cid);
phwi_ctrlr = phba->phwi_ctrlr;
pwrb_context = &phwi_ctrlr->wrb_context[cri_index];
if (pwrb_context->wrb_handles_available >= 2) {
pwrb_handle = pwrb_context->pwrb_handle_base[
pwrb_context->alloc_index];
pwrb_context->wrb_handles_available--;
if (pwrb_context->alloc_index ==
(phba->params.wrbs_per_cxn - 1))
pwrb_context->alloc_index = 0;
else
pwrb_context->alloc_index++;
/* return the context address */
*pcontext = pwrb_context;
return beiscsi_get_wrb_handle(pwrb_context, phba->params.wrbs_per_cxn);
}
/* Return the context address */
*pcontext = pwrb_context;
} else
pwrb_handle = NULL;
return pwrb_handle;
static inline void
beiscsi_put_wrb_handle(struct hwi_wrb_context *pwrb_context,
struct wrb_handle *pwrb_handle,
unsigned int wrbs_per_cxn)
{
pwrb_context->pwrb_handle_base[pwrb_context->free_index] = pwrb_handle;
pwrb_context->wrb_handles_available++;
if (pwrb_context->free_index == (wrbs_per_cxn - 1))
pwrb_context->free_index = 0;
else
pwrb_context->free_index++;
}
/**
@ -1227,13 +1243,9 @@ static void
free_wrb_handle(struct beiscsi_hba *phba, struct hwi_wrb_context *pwrb_context,
struct wrb_handle *pwrb_handle)
{
pwrb_context->pwrb_handle_base[pwrb_context->free_index] = pwrb_handle;
pwrb_context->wrb_handles_available++;
if (pwrb_context->free_index == (phba->params.wrbs_per_cxn - 1))
pwrb_context->free_index = 0;
else
pwrb_context->free_index++;
beiscsi_put_wrb_handle(pwrb_context,
pwrb_handle,
phba->params.wrbs_per_cxn);
beiscsi_log(phba, KERN_INFO,
BEISCSI_LOG_IO | BEISCSI_LOG_CONFIG,
"BM_%d : FREE WRB: pwrb_handle=%p free_index=0x%x"
@ -4711,6 +4723,20 @@ beiscsi_offload_connection(struct beiscsi_conn *beiscsi_conn,
doorbell |= 1 << DB_DEF_PDU_NUM_POSTED_SHIFT;
iowrite32(doorbell, phba->db_va +
beiscsi_conn->doorbell_offset);
/*
* There is no completion for CONTEXT_UPDATE. The completion of next
* WRB posted guarantees FW's processing and DMA'ing of it.
* Use beiscsi_put_wrb_handle to put it back in the pool which makes
* sure zero'ing or reuse of the WRB only after wrbs_per_cxn.
*/
beiscsi_put_wrb_handle(pwrb_context, pwrb_handle,
phba->params.wrbs_per_cxn);
beiscsi_log(phba, KERN_INFO,
BEISCSI_LOG_IO | BEISCSI_LOG_CONFIG,
"BM_%d : put CONTEXT_UPDATE pwrb_handle=%p free_index=0x%x wrb_handles_available=%d\n",
pwrb_handle, pwrb_context->free_index,
pwrb_context->wrb_handles_available);
}
static void beiscsi_parse_pdu(struct iscsi_conn *conn, itt_t itt,