[RFC PATCH v4 5/5] scsi: hisi_sas: Add support for DIX feature for v3 hw as experimental
From: John Garry
Date: Thu Dec 06 2018 - 08:33:40 EST
From: Xiang Chen <chenxiang66@xxxxxxxxxxxxx>
This patchset adds support for DIX to v3 hw driver.
As discussed in the following thread, DIX seems to be in conflict with
SCSI MQ, so this is why we mark the support for this driver as
experimental:
https://marc.info/?l=linux-scsi&m=154392687627603&w=2,
As for cause of the issue, we cannot confirm.
As for DIX support itself, we build upon support for DIF, most
significantly is adding new DMA map and unmap paths.
Signed-off-by: Xiang Chen <chenxiang66@xxxxxxxxxxxxx>
Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
---
drivers/scsi/hisi_sas/hisi_sas.h | 17 ++++++
drivers/scsi/hisi_sas/hisi_sas_main.c | 97 ++++++++++++++++++++++++++++++----
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 83 +++++++++++++++++++++++++++--
3 files changed, 182 insertions(+), 15 deletions(-)
diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 5c780fe..acac923 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -55,6 +55,11 @@
#define hisi_sas_sge_addr_mem(slot) hisi_sas_sge_addr(slot->buf)
#define hisi_sas_sge_addr_dma(slot) hisi_sas_sge_addr(slot->buf_dma)
+#define hisi_sas_sge_dif_addr(buf) \
+ (buf + offsetof(struct hisi_sas_slot_dif_buf_table, sge_dif_page))
+#define hisi_sas_sge_dif_addr_mem(slot) hisi_sas_sge_dif_addr(slot->buf)
+#define hisi_sas_sge_dif_addr_dma(slot) hisi_sas_sge_dif_addr(slot->buf_dma)
+
#define HISI_SAS_MAX_SSP_RESP_SZ (sizeof(struct ssp_frame_hdr) + 1024)
#define HISI_SAS_MAX_SMP_RESP_SZ 1028
#define HISI_SAS_MAX_STP_RESP_SZ 28
@@ -197,6 +202,7 @@ struct hisi_sas_slot {
struct sas_task *task;
struct hisi_sas_port *port;
u64 n_elem;
+ u64 n_elem_dif;
int dlvry_queue;
int dlvry_queue_slot;
int cmplt_queue;
@@ -269,6 +275,7 @@ struct hisi_hba {
struct device *dev;
bool enable_dif;
+ bool enable_dix_experimental;
void __iomem *regs;
void __iomem *sgpio_regs;
@@ -424,6 +431,11 @@ struct hisi_sas_sge_page {
struct hisi_sas_sge sge[HISI_SAS_SGE_PAGE_CNT];
} __aligned(16);
+#define HISI_SAS_SGE_DIF_PAGE_CNT SG_CHUNK_SIZE
+struct hisi_sas_sge_dif_page {
+ struct hisi_sas_sge sge[HISI_SAS_SGE_DIF_PAGE_CNT];
+} __aligned(16);
+
struct hisi_sas_command_table_ssp {
struct ssp_frame_hdr hdr;
union {
@@ -454,6 +466,11 @@ struct hisi_sas_slot_buf_table {
struct hisi_sas_sge_page sge_page;
};
+struct hisi_sas_slot_dif_buf_table {
+ struct hisi_sas_slot_buf_table slot_buf;
+ struct hisi_sas_sge_dif_page sge_dif_page;
+};
+
extern struct scsi_transport_template *hisi_sas_stt;
extern void hisi_sas_stop_phys(struct hisi_hba *hisi_hba);
extern int hisi_sas_alloc(struct hisi_hba *hisi_hba, struct Scsi_Host *shost);
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index eed7fc5..48b2b52 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -252,14 +252,21 @@ void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba, struct sas_task *task,
task->lldd_task = NULL;
- if (!sas_protocol_ata(task->task_proto))
+ if (!sas_protocol_ata(task->task_proto)) {
+ struct sas_ssp_task *ssp_task = &task->ssp_task;
+ struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;
+
if (slot->n_elem)
dma_unmap_sg(dev, task->scatter,
task->num_scatter,
task->data_dir);
+ if (slot->n_elem_dif)
+ dma_unmap_sg(dev, scsi_prot_sglist(scsi_cmnd),
+ scsi_prot_sg_count(scsi_cmnd),
+ task->data_dir);
+ }
}
-
spin_lock_irqsave(&dq->lock, flags);
list_del_init(&slot->entry);
spin_unlock_irqrestore(&dq->lock, flags);
@@ -380,6 +387,59 @@ static int hisi_sas_dma_map(struct hisi_hba *hisi_hba,
return rc;
}
+static void hisi_sas_dif_dma_unmap(struct hisi_hba *hisi_hba,
+ struct sas_task *task, int n_elem_dif)
+{
+ struct device *dev = hisi_hba->dev;
+
+ if (n_elem_dif) {
+ struct sas_ssp_task *ssp_task = &task->ssp_task;
+ struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;
+
+ dma_unmap_sg(dev, scsi_prot_sglist(scsi_cmnd),
+ scsi_prot_sg_count(scsi_cmnd),
+ task->data_dir);
+ }
+}
+
+static int hisi_sas_dif_dma_map(struct hisi_hba *hisi_hba,
+ int *n_elem_dif, struct sas_task *task)
+{
+ struct device *dev = hisi_hba->dev;
+ struct sas_ssp_task *ssp_task;
+ struct scsi_cmnd *scsi_cmnd;
+ int rc;
+
+ if (task->num_scatter) {
+ ssp_task = &task->ssp_task;
+ scsi_cmnd = ssp_task->cmd;
+
+ if (scsi_prot_sg_count(scsi_cmnd)) {
+ *n_elem_dif = dma_map_sg(dev,
+ scsi_prot_sglist(scsi_cmnd),
+ scsi_prot_sg_count(scsi_cmnd),
+ task->data_dir);
+
+ if (!*n_elem_dif)
+ return -ENOMEM;
+
+ if (*n_elem_dif > HISI_SAS_SGE_DIF_PAGE_CNT) {
+ dev_err(dev, "task prep: n_elem_dif(%d) too large\n",
+ *n_elem_dif);
+ rc = -EINVAL;
+ goto err_out_dif_dma_unmap;
+ }
+ }
+ }
+
+ return 0;
+
+err_out_dif_dma_unmap:
+ dma_unmap_sg(dev, scsi_prot_sglist(scsi_cmnd),
+ scsi_prot_sg_count(scsi_cmnd), task->data_dir);
+ return rc;
+}
+
static int hisi_sas_task_prep(struct sas_task *task,
struct hisi_sas_dq **dq_pointer,
bool is_tmf, struct hisi_sas_tmf_task *tmf,
@@ -394,7 +454,7 @@ static int hisi_sas_task_prep(struct sas_task *task,
struct asd_sas_port *sas_port = device->port;
struct device *dev = hisi_hba->dev;
int dlvry_queue_slot, dlvry_queue, rc, slot_idx;
- int n_elem = 0, n_elem_req = 0, n_elem_resp = 0;
+ int n_elem = 0, n_elem_dif = 0, n_elem_req = 0, n_elem_resp = 0;
struct hisi_sas_dq *dq;
unsigned long flags;
int wr_q_index;
@@ -427,6 +487,12 @@ static int hisi_sas_task_prep(struct sas_task *task,
if (rc < 0)
goto prep_out;
+ if (!sas_protocol_ata(task->task_proto)) {
+ rc = hisi_sas_dif_dma_map(hisi_hba, &n_elem_dif, task);
+ if (rc < 0)
+ goto err_out_dma_unmap;
+ }
+
if (hisi_hba->hw->slot_index_alloc)
rc = hisi_hba->hw->slot_index_alloc(hisi_hba, device);
else {
@@ -445,7 +511,7 @@ static int hisi_sas_task_prep(struct sas_task *task,
rc = hisi_sas_slot_index_alloc(hisi_hba, scsi_cmnd);
}
if (rc < 0)
- goto err_out_dma_unmap;
+ goto err_out_dif_dma_unmap;
slot_idx = rc;
slot = &hisi_hba->slot_info[slot_idx];
@@ -466,6 +532,7 @@ static int hisi_sas_task_prep(struct sas_task *task,
dlvry_queue_slot = wr_q_index;
slot->n_elem = n_elem;
+ slot->n_elem_dif = n_elem_dif;
slot->dlvry_queue = dlvry_queue;
slot->dlvry_queue_slot = dlvry_queue_slot;
cmd_hdr_base = hisi_hba->cmd_hdr[dlvry_queue];
@@ -509,6 +576,9 @@ static int hisi_sas_task_prep(struct sas_task *task,
err_out_tag:
hisi_sas_slot_index_free(hisi_hba, slot_idx);
+err_out_dif_dma_unmap:
+ if (!sas_protocol_ata(task->task_proto))
+ hisi_sas_dif_dma_unmap(hisi_hba, task, n_elem_dif);
err_out_dma_unmap:
hisi_sas_dma_unmap(hisi_hba, task, n_elem,
n_elem_req, n_elem_resp);
@@ -2144,19 +2214,24 @@ int hisi_sas_alloc(struct hisi_hba *hisi_hba, struct Scsi_Host *shost)
/* roundup to avoid overly large block size */
max_command_entries_ru = roundup(max_command_entries, 64);
- sz_slot_buf_ru = roundup(sizeof(struct hisi_sas_slot_buf_table), 64);
+ if (hisi_hba->enable_dix_experimental)
+ sz_slot_buf_ru = sizeof(struct hisi_sas_slot_dif_buf_table);
+ else
+ sz_slot_buf_ru = sizeof(struct hisi_sas_slot_buf_table);
+ sz_slot_buf_ru = roundup(sz_slot_buf_ru, 64);
s = lcm(max_command_entries_ru, sz_slot_buf_ru);
blk_cnt = (max_command_entries_ru * sz_slot_buf_ru) / s;
slots_per_blk = s / sz_slot_buf_ru;
+
for (i = 0; i < blk_cnt; i++) {
- struct hisi_sas_slot_buf_table *buf;
- dma_addr_t buf_dma;
int slot_index = i * slots_per_blk;
+ dma_addr_t buf_dma;
+ void *buf;
- buf = dmam_alloc_coherent(dev, s, &buf_dma, GFP_KERNEL);
+ buf = dmam_alloc_coherent(dev, s, &buf_dma,
+ GFP_KERNEL | __GFP_ZERO);
if (!buf)
goto err_out;
- memset(buf, 0, s);
for (j = 0; j < slots_per_blk; j++, slot_index++) {
struct hisi_sas_slot *slot;
@@ -2166,8 +2241,8 @@ int hisi_sas_alloc(struct hisi_hba *hisi_hba, struct Scsi_Host *shost)
slot->buf_dma = buf_dma;
slot->idx = slot_index;
- buf++;
- buf_dma += sizeof(*buf);
+ buf += sz_slot_buf_ru;
+ buf_dma += sz_slot_buf_ru;
}
}
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index c707bb1..e15d87f 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -405,6 +405,10 @@ struct hisi_sas_err_record_v3 {
module_param(enable_dif, bool, 0444);
MODULE_PARM_DESC(enable_dif, "DIF enable (0-1)");
+static bool enable_dix_experimental;
+module_param(enable_dix_experimental, bool, 0444);
+MODULE_PARM_DESC(enable_dix_experimental, "DIX enable (experimental) (0-1)");
+
static u32 hisi_sas_read32(struct hisi_hba *hisi_hba, u32 off)
{
void __iomem *regs = hisi_hba->regs + off;
@@ -968,7 +972,34 @@ static void prep_prd_sge_v3_hw(struct hisi_hba *hisi_hba,
hdr->prd_table_addr = cpu_to_le64(hisi_sas_sge_addr_dma(slot));
- hdr->sg_len = cpu_to_le32(n_elem << CMD_HDR_DATA_SGL_LEN_OFF);
+ hdr->sg_len |= cpu_to_le32(n_elem << CMD_HDR_DATA_SGL_LEN_OFF);
+}
+
+static void prep_prd_sge_dif_v3_hw(struct hisi_hba *hisi_hba,
+ struct hisi_sas_slot *slot,
+ struct hisi_sas_cmd_hdr *hdr,
+ struct scatterlist *scatter,
+ int n_elem)
+{
+ struct hisi_sas_sge_dif_page *sge_dif_page;
+ struct scatterlist *sg;
+ int i;
+
+ sge_dif_page = hisi_sas_sge_dif_addr_mem(slot);
+
+ for_each_sg(scatter, sg, n_elem, i) {
+ struct hisi_sas_sge *entry = &sge_dif_page->sge[i];
+
+ entry->addr = cpu_to_le64(sg_dma_address(sg));
+ entry->page_ctrl_0 = entry->page_ctrl_1 = 0;
+ entry->data_len = cpu_to_le32(sg_dma_len(sg));
+ entry->data_off = 0;
+ }
+
+ hdr->dif_prd_table_addr = cpu_to_le64(
+ hisi_sas_sge_dif_addr_dma(slot));
+
+ hdr->sg_len |= cpu_to_le32(n_elem << CMD_HDR_DIF_SGL_LEN_OFF);
}
static void fill_prot_v3_hw(struct scsi_cmnd *scsi_cmnd,
@@ -985,6 +1016,10 @@ static void fill_prot_v3_hw(struct scsi_cmnd *scsi_cmnd,
lbrt_chk_val = (u32)scsi_get_lba(scsi_cmnd);
switch (prot_op) {
+ case SCSI_PROT_READ_INSERT:
+ prot->dw0 |= T10_INSRT_EN_MSK;
+ prot->lbrtgv = lbrt_chk_val;
+ break;
case SCSI_PROT_READ_STRIP:
prot->dw0 |= (T10_RMV_EN_MSK | T10_CHK_EN_MSK);
prot->lbrtcv = lbrt_chk_val;
@@ -993,10 +1028,30 @@ static void fill_prot_v3_hw(struct scsi_cmnd *scsi_cmnd,
else if (prot_type == SCSI_PROT_DIF_TYPE3)
prot->dw4 |= (0xfc << 16);
break;
+ case SCSI_PROT_READ_PASS:
+ prot->dw0 |= T10_CHK_EN_MSK;
+ prot->lbrtcv = lbrt_chk_val;
+ if (prot_type == SCSI_PROT_DIF_TYPE1)
+ prot->dw4 |= (0xc << 16);
+ else if (prot_type == SCSI_PROT_DIF_TYPE3)
+ prot->dw4 |= (0xfc << 16);
+ break;
case SCSI_PROT_WRITE_INSERT:
prot->dw0 |= T10_INSRT_EN_MSK;
prot->lbrtgv = lbrt_chk_val;
break;
+ case SCSI_PROT_WRITE_STRIP:
+ prot->dw0 |= (T10_RMV_EN_MSK | T10_CHK_EN_MSK);
+ prot->lbrtcv = lbrt_chk_val;
+ break;
+ case SCSI_PROT_WRITE_PASS:
+ prot->dw0 |= T10_CHK_EN_MSK;
+ prot->lbrtcv = lbrt_chk_val;
+ if (prot_type == SCSI_PROT_DIF_TYPE1)
+ prot->dw4 |= (0xc << 16);
+ else if (prot_type == SCSI_PROT_DIF_TYPE3)
+ prot->dw4 |= (0xfc << 16);
+ break;
default:
WARN_ONCE(1, "prot_op(0x%x) is not valid\n", prot_op);
break;
@@ -1071,9 +1126,15 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
hdr->dw2 = cpu_to_le32(dw2);
hdr->transfer_tags = cpu_to_le32(slot->idx);
- if (has_data)
+ if (has_data) {
prep_prd_sge_v3_hw(hisi_hba, slot, hdr, task->scatter,
- slot->n_elem);
+ slot->n_elem);
+
+ if (scsi_prot_sg_count(scsi_cmnd))
+ prep_prd_sge_dif_v3_hw(hisi_hba, slot, hdr,
+ scsi_prot_sglist(scsi_cmnd),
+ slot->n_elem_dif);
+ }
hdr->cmd_table_addr = cpu_to_le64(hisi_sas_cmd_hdr_addr_dma(slot));
hdr->sts_buffer_addr = cpu_to_le64(hisi_sas_status_buf_addr_dma(slot));
@@ -1115,7 +1176,10 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
memcpy(buf_cmd_prot, &prot,
sizeof(struct hisi_sas_protect_iu_v3_hw));
- if (prot_op == SCSI_PROT_WRITE_INSERT) {
+ if ((prot_op == SCSI_PROT_WRITE_INSERT) ||
+ (prot_op == SCSI_PROT_READ_INSERT) ||
+ (prot_op == SCSI_PROT_WRITE_PASS) ||
+ (prot_op == SCSI_PROT_READ_PASS)) {
unsigned int interval = scsi_prot_interval(scsi_cmnd);
unsigned int ilog2_interval = ilog2(interval);
@@ -2336,6 +2400,7 @@ static ssize_t intr_coal_count_v3_hw_store(struct device *dev,
.bios_param = sas_bios_param,
.this_id = -1,
.sg_tablesize = HISI_SAS_SGE_PAGE_CNT,
+ .sg_prot_tablesize = HISI_SAS_SGE_PAGE_CNT,
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
.eh_device_reset_handler = sas_eh_device_reset_handler,
@@ -2396,6 +2461,7 @@ static ssize_t intr_coal_count_v3_hw_store(struct device *dev,
hisi_hba->shost = shost;
SHOST_TO_SAS_HA(shost) = &hisi_hba->sha;
hisi_hba->enable_dif = enable_dif;
+ hisi_hba->enable_dix_experimental = enable_dix_experimental;
timer_setup(&hisi_hba->timer, NULL, 0);
@@ -2516,6 +2582,15 @@ static ssize_t intr_coal_count_v3_hw_store(struct device *dev,
SHOST_DIF_TYPE3_PROTECTION;
}
+ if (hisi_hba->enable_dix_experimental) {
+ dev_warn(dev, "Registering for DIX type 1/2/3 protection as experimental.\n");
+ prot |= SHOST_DIX_TYPE1_PROTECTION |
+ SHOST_DIX_TYPE2_PROTECTION |
+ SHOST_DIX_TYPE3_PROTECTION;
+ scsi_host_set_guard(hisi_hba->shost,
+ SHOST_DIX_GUARD_CRC);
+ }
+
scsi_host_set_prot(hisi_hba->shost, prot);
scsi_scan_host(shost);
--
1.9.1