[PATCH 5.15 020/136] scsi: qla2xxx: edif: Fix dropped IKE message

Greg Kroah-Hartman
2022-08-29T11:03:01Z

From: Quinn Tran <qutran@marvell.com>

[ Upstream commit c019cd656e717349ff22d0c41d6fbfc773f48c52 ]

This patch fixes IKE message being dropped due to error in processing Purex
IOCB and Continuation IOCBs.

Link: https://lore.kernel.org/r/20220713052045.10683-6-njavali@marvell.com
Fixes: fac2807946c1 ("scsi: qla2xxx: edif: Add extraction of auth_els from the wire")
Cc: stable@vger.kernel.org
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/qla2xxx/qla_isr.c | 54 +++++++++++++++-------------------
1 file changed, 24 insertions(+), 30 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index ecbc0a5ffb3f5..59f5918dca95f 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -3707,12 +3707,11 @@ void qla24xx_nvme_ls4_iocb(struct scsi_qla_host *vha,
* Return: 0 all iocbs has arrived, xx- all iocbs have not arrived.
*/
static int qla_chk_cont_iocb_avail(struct scsi_qla_host *vha,
- struct rsp_que *rsp, response_t *pkt)
+ struct rsp_que *rsp, response_t *pkt, u32 rsp_q_in)
{
- int start_pkt_ring_index, end_pkt_ring_index, n_ring_index;
- response_t *end_pkt;
+ int start_pkt_ring_index;
+ u32 iocb_cnt = 0;
int rc = 0;
- u32 rsp_q_in;

if (pkt->entry_count == 1)
return rc;
@@ -3723,34 +3722,18 @@ static int qla_chk_cont_iocb_avail(struct scsi_qla_host *vha,
else
start_pkt_ring_index = rsp->ring_index - 1;

- if ((start_pkt_ring_index + pkt->entry_count) >= rsp->length)
- end_pkt_ring_index = start_pkt_ring_index + pkt->entry_count -
- rsp->length - 1;
+ if (rsp_q_in < start_pkt_ring_index)
+ /* q in ptr is wrapped */
+ iocb_cnt = rsp->length - start_pkt_ring_index + rsp_q_in;
else
- end_pkt_ring_index = start_pkt_ring_index + pkt->entry_count - 1;
+ iocb_cnt = rsp_q_in - start_pkt_ring_index;

- end_pkt = rsp->ring + end_pkt_ring_index;
-
- /* next pkt = end_pkt + 1 */
- n_ring_index = end_pkt_ring_index + 1;
- if (n_ring_index >= rsp->length)
- n_ring_index = 0;
-
- rsp_q_in = rsp->qpair->use_shadow_reg ? *rsp->in_ptr :
- rd_reg_dword(rsp->rsp_q_in);
-
- /* rsp_q_in is either wrapped or pointing beyond endpkt */
- if ((rsp_q_in < start_pkt_ring_index && rsp_q_in < n_ring_index) ||
- rsp_q_in >= n_ring_index)
- /* all IOCBs arrived. */
- rc = 0;
- else
+ if (iocb_cnt < pkt->entry_count)
rc = -EIO;

- ql_dbg(ql_dbg_init + ql_dbg_verbose, vha, 0x5091,
- "%s - ring %p pkt %p end pkt %p entry count %#x rsp_q_in %d rc %d\n",
- __func__, rsp->ring, pkt, end_pkt, pkt->entry_count,
- rsp_q_in, rc);
+ ql_dbg(ql_dbg_init, vha, 0x5091,
+ "%s - ring %p pkt %p entry count %d iocb_cnt %d rsp_q_in %d rc %d\n",
+ __func__, rsp->ring, pkt, pkt->entry_count, iocb_cnt, rsp_q_in, rc);

return rc;
}
@@ -3767,7 +3750,7 @@ void qla24xx_process_response_queue(struct scsi_qla_host *vha,
struct qla_hw_data *ha = vha->hw;
struct purex_entry_24xx *purex_entry;
struct purex_item *pure_item;
- u16 rsp_in = 0;
+ u16 rsp_in = 0, cur_ring_index;
int follow_inptr, is_shadow_hba;

if (!ha->flags.fw_started)
@@ -3798,6 +3781,7 @@ void qla24xx_process_response_queue(struct scsi_qla_host *vha,
(!follow_inptr &&
rsp->ring_ptr->signature != RESPONSE_PROCESSED)) {
pkt = (struct sts_entry_24xx *)rsp->ring_ptr;
+ cur_ring_index = rsp->ring_index;

rsp->ring_index++;
if (rsp->ring_index == rsp->length) {
@@ -3918,7 +3902,17 @@ void qla24xx_process_response_queue(struct scsi_qla_host *vha,
break;

case ELS_AUTH_ELS:
- if (qla_chk_cont_iocb_avail(vha, rsp, (response_t *)pkt)) {
+ if (qla_chk_cont_iocb_avail(vha, rsp, (response_t *)pkt, rsp_in)) {
+ /*
+ * ring_ptr and ring_index were
+ * pre-incremented above. Reset them
+ * back to current. Wait for next
+ * interrupt with all IOCBs to arrive
+ * and re-process.
+ */
+ rsp->ring_ptr = (response_t *)pkt;
+ rsp->ring_index = cur_ring_index;
+
ql_dbg(ql_dbg_init, vha, 0x5091,
"Defer processing ELS opcode %#x...\n",
purex_entry->els_frame_payload[3]);
--
2.35.1