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scsi: qla2xxx: Add boundary checks for exchanges to be offloaded 

Max boundary for exchange off load is 32k exchanges. If a system
is unable to allocate large memory buffer to support this feature,
then driver will reduce the number of exchanges down to a value
system can support.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Quinn Tran 2017-12-28 12:33:12 -08:00 committed by Martin K. Petersen
parent 3407fc373d
commit d1e3635a5e
2 changed files with 33 additions and 9 deletions
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3
drivers/scsi/qla2xxx/qla_def.h
View File

@ -288,6 +288,8 @@ struct name_list_extended {
#define ATIO_ENTRY_CNT_24XX 4096 /* Number of ATIO entries. */
#define RESPONSE_ENTRY_CNT_FX00 256 /* Number of response entries.*/
#define FW_DEF_EXCHANGES_CNT 2048
#define FW_MAX_EXCHANGES_CNT (32 * 1024)
#define REDUCE_EXCHANGES_CNT (8 * 1024)
struct req_que;
struct qla_tgt_sess;
@ -3506,6 +3508,7 @@ struct qla_hw_data {
uint32_t using_lr_setting:1;
} flags;
uint16_t max_exchg;
uint16_t long_range_distance; /* 32G & above */
#define LR_DISTANCE_5K 1
#define LR_DISTANCE_10K 0

39
drivers/scsi/qla2xxx/qla_os.c
View File

@ -2789,6 +2789,7 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
ha->init_cb_size = sizeof(init_cb_t);
ha->link_data_rate = PORT_SPEED_UNKNOWN;
ha->optrom_size = OPTROM_SIZE_2300;
ha->max_exchg = FW_MAX_EXCHANGES_CNT;
/* Assign ISP specific operations. */
if (IS_QLA2100(ha)) {
@ -4230,6 +4231,9 @@ qla2x00_number_of_exch(scsi_qla_host_t *vha, u32 *ret_cnt, u16 max_cnt)
u32 temp;
*ret_cnt = FW_DEF_EXCHANGES_CNT;
if (max_cnt > vha->hw->max_exchg)
max_cnt = vha->hw->max_exchg;
if (qla_ini_mode_enabled(vha)) {
if (ql2xiniexchg > max_cnt)
ql2xiniexchg = max_cnt;
@ -4259,8 +4263,8 @@ int
qla2x00_set_exchoffld_buffer(scsi_qla_host_t *vha)
{
int rval;
u16 size, max_cnt;
u32 temp;
u16 size, max_cnt;
u32 actual_cnt, totsz;
struct qla_hw_data *ha = vha->hw;
if (!ha->flags.exchoffld_enabled)
@ -4277,16 +4281,19 @@ qla2x00_set_exchoffld_buffer(scsi_qla_host_t *vha)
return rval;
}
qla2x00_number_of_exch(vha, &temp, max_cnt);
temp *= size;
qla2x00_number_of_exch(vha, &actual_cnt, max_cnt);
ql_log(ql_log_info, vha, 0xd014,
"Actual exchange offload count: %d.\n", actual_cnt);
if (temp != ha->exchoffld_size) {
totsz = actual_cnt * size;
if (totsz != ha->exchoffld_size) {
qla2x00_free_exchoffld_buffer(ha);
ha->exchoffld_size = temp;
ha->exchoffld_size = totsz;
ql_log(ql_log_info, vha, 0xd016,
"Exchange offload: max_count=%d, buffers=0x%x, total=%d.\n",
max_cnt, size, temp);
"Exchange offload: max_count=%d, actual count=%d entry sz=0x%x, total sz=0x%x\n",
max_cnt, actual_cnt, size, totsz);
ql_log(ql_log_info, vha, 0xd017,
"Exchange Buffers requested size = 0x%x\n",
@ -4297,7 +4304,21 @@ qla2x00_set_exchoffld_buffer(scsi_qla_host_t *vha)
ha->exchoffld_size, &ha->exchoffld_buf_dma, GFP_KERNEL);
if (!ha->exchoffld_buf) {
ql_log_pci(ql_log_fatal, ha->pdev, 0xd013,
"Failed to allocate memory for exchoffld_buf_dma.\n");
"Failed to allocate memory for Exchange Offload.\n");
if (ha->max_exchg >
(FW_DEF_EXCHANGES_CNT + REDUCE_EXCHANGES_CNT)) {
ha->max_exchg -= REDUCE_EXCHANGES_CNT;
} else if (ha->max_exchg >
(FW_DEF_EXCHANGES_CNT + 512)) {
ha->max_exchg -= 512;
} else {
ha->flags.exchoffld_enabled = 0;
ql_log_pci(ql_log_fatal, ha->pdev, 0xd013,
"Disabling Exchange offload due to lack of memory\n");
}
ha->exchoffld_size = 0;
return -ENOMEM;
}
}