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path: root/drivers/scsi/scsi_debug.c
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Diffstat (limited to 'drivers/scsi/scsi_debug.c')
-rw-r--r--drivers/scsi/scsi_debug.c137
1 files changed, 73 insertions, 64 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 01c0ffa3127..80b8b10edf4 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -169,7 +169,7 @@ static int scsi_debug_dix = DEF_DIX;
static int scsi_debug_dsense = DEF_D_SENSE;
static int scsi_debug_every_nth = DEF_EVERY_NTH;
static int scsi_debug_fake_rw = DEF_FAKE_RW;
-static int scsi_debug_guard = DEF_GUARD;
+static unsigned int scsi_debug_guard = DEF_GUARD;
static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED;
static int scsi_debug_max_luns = DEF_MAX_LUNS;
static int scsi_debug_max_queue = SCSI_DEBUG_CANQUEUE;
@@ -293,6 +293,20 @@ static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
0, 0, 0x0, 0x0};
+static void *fake_store(unsigned long long lba)
+{
+ lba = do_div(lba, sdebug_store_sectors);
+
+ return fake_storep + lba * scsi_debug_sector_size;
+}
+
+static struct sd_dif_tuple *dif_store(sector_t sector)
+{
+ sector = do_div(sector, sdebug_store_sectors);
+
+ return dif_storep + sector;
+}
+
static int sdebug_add_adapter(void);
static void sdebug_remove_adapter(void);
@@ -1731,25 +1745,22 @@ static int do_device_access(struct scsi_cmnd *scmd,
return ret;
}
-static u16 dif_compute_csum(const void *buf, int len)
+static __be16 dif_compute_csum(const void *buf, int len)
{
- u16 csum;
+ __be16 csum;
- switch (scsi_debug_guard) {
- case 1:
- csum = ip_compute_csum(buf, len);
- break;
- case 0:
+ if (scsi_debug_guard)
+ csum = (__force __be16)ip_compute_csum(buf, len);
+ else
csum = cpu_to_be16(crc_t10dif(buf, len));
- break;
- }
+
return csum;
}
static int dif_verify(struct sd_dif_tuple *sdt, const void *data,
sector_t sector, u32 ei_lba)
{
- u16 csum = dif_compute_csum(data, scsi_debug_sector_size);
+ __be16 csum = dif_compute_csum(data, scsi_debug_sector_size);
if (sdt->guard_tag != csum) {
pr_err("%s: GUARD check failed on sector %lu rcvd 0x%04x, data 0x%04x\n",
@@ -1775,59 +1786,71 @@ static int dif_verify(struct sd_dif_tuple *sdt, const void *data,
return 0;
}
-static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
- unsigned int sectors, u32 ei_lba)
+static void dif_copy_prot(struct scsi_cmnd *SCpnt, sector_t sector,
+ unsigned int sectors, bool read)
{
unsigned int i, resid;
struct scatterlist *psgl;
- struct sd_dif_tuple *sdt;
- sector_t sector;
- sector_t tmp_sec = start_sec;
void *paddr;
+ const void *dif_store_end = dif_storep + sdebug_store_sectors;
- start_sec = do_div(tmp_sec, sdebug_store_sectors);
+ /* Bytes of protection data to copy into sgl */
+ resid = sectors * sizeof(*dif_storep);
- sdt = dif_storep + start_sec;
+ scsi_for_each_prot_sg(SCpnt, psgl, scsi_prot_sg_count(SCpnt), i) {
+ int len = min(psgl->length, resid);
+ void *start = dif_store(sector);
+ int rest = 0;
- for (i = 0 ; i < sectors ; i++) {
- int ret;
+ if (dif_store_end < start + len)
+ rest = start + len - dif_store_end;
- if (sdt[i].app_tag == 0xffff)
- continue;
+ paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
- sector = start_sec + i;
+ if (read)
+ memcpy(paddr, start, len - rest);
+ else
+ memcpy(start, paddr, len - rest);
- ret = dif_verify(&sdt[i],
- fake_storep + sector * scsi_debug_sector_size,
- sector, ei_lba);
- if (ret) {
- dif_errors++;
- return ret;
+ if (rest) {
+ if (read)
+ memcpy(paddr + len - rest, dif_storep, rest);
+ else
+ memcpy(dif_storep, paddr + len - rest, rest);
}
- ei_lba++;
+ sector += len / sizeof(*dif_storep);
+ resid -= len;
+ kunmap_atomic(paddr);
}
+}
- /* Bytes of protection data to copy into sgl */
- resid = sectors * sizeof(*dif_storep);
- sector = start_sec;
+static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
+ unsigned int sectors, u32 ei_lba)
+{
+ unsigned int i;
+ struct sd_dif_tuple *sdt;
+ sector_t sector;
- scsi_for_each_prot_sg(SCpnt, psgl, scsi_prot_sg_count(SCpnt), i) {
- int len = min(psgl->length, resid);
+ for (i = 0; i < sectors; i++) {
+ int ret;
- paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
- memcpy(paddr, dif_storep + sector, len);
+ sector = start_sec + i;
+ sdt = dif_store(sector);
- sector += len / sizeof(*dif_storep);
- if (sector >= sdebug_store_sectors) {
- /* Force wrap */
- tmp_sec = sector;
- sector = do_div(tmp_sec, sdebug_store_sectors);
+ if (sdt->app_tag == cpu_to_be16(0xffff))
+ continue;
+
+ ret = dif_verify(sdt, fake_store(sector), sector, ei_lba);
+ if (ret) {
+ dif_errors++;
+ return ret;
}
- resid -= len;
- kunmap_atomic(paddr);
+
+ ei_lba++;
}
+ dif_copy_prot(SCpnt, start_sec, sectors, true);
dix_reads++;
return 0;
@@ -1910,15 +1933,12 @@ static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
{
int i, j, ret;
struct sd_dif_tuple *sdt;
- struct scatterlist *dsgl = scsi_sglist(SCpnt);
+ struct scatterlist *dsgl;
struct scatterlist *psgl = scsi_prot_sglist(SCpnt);
void *daddr, *paddr;
- sector_t tmp_sec = start_sec;
- sector_t sector;
+ sector_t sector = start_sec;
int ppage_offset;
- sector = do_div(tmp_sec, sdebug_store_sectors);
-
BUG_ON(scsi_sg_count(SCpnt) == 0);
BUG_ON(scsi_prot_sg_count(SCpnt) == 0);
@@ -1946,25 +1966,13 @@ static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
sdt = paddr + ppage_offset;
- ret = dif_verify(sdt, daddr + j, start_sec, ei_lba);
+ ret = dif_verify(sdt, daddr + j, sector, ei_lba);
if (ret) {
dump_sector(daddr + j, scsi_debug_sector_size);
goto out;
}
- /* Would be great to copy this in bigger
- * chunks. However, for the sake of
- * correctness we need to verify each sector
- * before writing it to "stable" storage
- */
- memcpy(dif_storep + sector, sdt, sizeof(*sdt));
-
sector++;
-
- if (sector == sdebug_store_sectors)
- sector = 0; /* Force wrap */
-
- start_sec++;
ei_lba++;
ppage_offset += sizeof(struct sd_dif_tuple);
}
@@ -1973,6 +1981,7 @@ static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
kunmap_atomic(daddr);
}
+ dif_copy_prot(SCpnt, start_sec, sectors, false);
dix_writes++;
return 0;
@@ -2742,7 +2751,7 @@ module_param_named(dix, scsi_debug_dix, int, S_IRUGO);
module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR);
module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR);
module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR);
-module_param_named(guard, scsi_debug_guard, int, S_IRUGO);
+module_param_named(guard, scsi_debug_guard, uint, S_IRUGO);
module_param_named(lbpu, scsi_debug_lbpu, int, S_IRUGO);
module_param_named(lbpws, scsi_debug_lbpws, int, S_IRUGO);
module_param_named(lbpws10, scsi_debug_lbpws10, int, S_IRUGO);
@@ -3172,7 +3181,7 @@ DRIVER_ATTR(dif, S_IRUGO, sdebug_dif_show, NULL);
static ssize_t sdebug_guard_show(struct device_driver *ddp, char *buf)
{
- return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_guard);
+ return scnprintf(buf, PAGE_SIZE, "%u\n", scsi_debug_guard);
}
DRIVER_ATTR(guard, S_IRUGO, sdebug_guard_show, NULL);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-07 20:17:35 +0000