From: James Smart jsmart2021@gmail.com
[ Upstream commit 39c4f1a965a9244c3ba60695e8ff8da065ec6ac4 ]
The driver is occasionally seeing the following SLI Port error, requiring reset and reinit:
Port Status Event: ... error 1=0x52004a01, error 2=0x218
The failure means an RQ timeout. That is, the adapter had received asynchronous receive frames, ran out of buffer slots to place the frames, and the driver did not replenish the buffer slots before a timeout occurred. The driver should not be so slow in replenishing buffers that a timeout can occur.
When the driver received all the frames of a sequence, it allocates an IOCB to put the frames in. In a situation where there was no IOCB available for the frame of a sequence, the RQ buffer corresponding to the first frame of the sequence was not returned to the FW. Eventually, with enough traffic encountering the situation, the timeout occurred.
Fix by releasing the buffer back to firmware whenever there is no IOCB for the first frame.
[mkp: typo]
Link: https://lore.kernel.org/r/20200128002312.16346-2-jsmart2021@gmail.com Signed-off-by: Dick Kennedy dick.kennedy@broadcom.com Signed-off-by: James Smart jsmart2021@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/lpfc/lpfc_sli.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 7a94c2d352390..97c0d79a2601f 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -15445,6 +15445,10 @@ lpfc_prep_seq(struct lpfc_vport *vport, struct hbq_dmabuf *seq_dmabuf) list_add_tail(&iocbq->list, &first_iocbq->list); } } + /* Free the sequence's header buffer */ + if (!first_iocbq) + lpfc_in_buf_free(vport->phba, &seq_dmabuf->dbuf); + return first_iocbq; }