[PATCH v4 1/3] scsi: 3w-9xxx: Use flexible array members to avoid struct padding

[PATCH v4 1/3] scsi: 3w-9xxx: Use flexible array members to avoid struct padding

[Samuel Holland]

In preparation for removing the "#pragma pack(1)" from the driver, fix
all instances where a trailing array member could be replaced by a
flexible array member. Since a flexible array member has zero size, it
introduces no padding, whether or not the struct is packed.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---

Changes since v3:
  - Consistently put sizeof(TW_Ioctl_Buf_Apache) before buffer_length.

---
 drivers/scsi/3w-9xxx.c | 16 ++++++++++------
 drivers/scsi/3w-9xxx.h |  4 ++--
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index 3337b1e80412..aad9b3b73e15 100644
--- a/drivers/scsi/3w-9xxx.c
+++ b/drivers/scsi/3w-9xxx.c
@@ -676,7 +676,9 @@ static long twa_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long
 	data_buffer_length_adjusted = (driver_command.buffer_length + 511) & ~511;
 
 	/* Now allocate ioctl buf memory */
-	cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, &dma_handle, GFP_KERNEL);
+	cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev,
+				      sizeof(TW_Ioctl_Buf_Apache) + data_buffer_length_adjusted,
+				      &dma_handle, GFP_KERNEL);
 	if (!cpu_addr) {
 		retval = TW_IOCTL_ERROR_OS_ENOMEM;
 		goto out2;
@@ -685,7 +687,7 @@ static long twa_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long
 	tw_ioctl = (TW_Ioctl_Buf_Apache *)cpu_addr;
 
 	/* Now copy down the entire ioctl */
-	if (copy_from_user(tw_ioctl, argp, driver_command.buffer_length + sizeof(TW_Ioctl_Buf_Apache) - 1))
+	if (copy_from_user(tw_ioctl, argp, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length))
 		goto out3;
 
 	/* See which ioctl we are doing */
@@ -867,11 +869,13 @@ static long twa_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long
 	}
 
 	/* Now copy the entire response to userspace */
-	if (copy_to_user(argp, tw_ioctl, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length - 1) == 0)
+	if (copy_to_user(argp, tw_ioctl, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length) == 0)
 		retval = 0;
 out3:
 	/* Now free ioctl buf memory */
-	dma_free_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, cpu_addr, dma_handle);
+	dma_free_coherent(&tw_dev->tw_pci_dev->dev,
+			  sizeof(TW_Ioctl_Buf_Apache) + data_buffer_length_adjusted,
+			  cpu_addr, dma_handle);
 out2:
 	mutex_unlock(&tw_dev->ioctl_lock);
 out:
@@ -1392,7 +1396,7 @@ static void twa_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_comm
 		newcommand->request_id__lunl =
 			cpu_to_le16(TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->request_id__lunl), request_id));
 		if (length) {
-			newcommand->sg_list[0].address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1);
+			newcommand->sg_list[0].address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache));
 			newcommand->sg_list[0].length = cpu_to_le32(length);
 		}
 		newcommand->sgl_entries__lunh =
@@ -1407,7 +1411,7 @@ static void twa_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_comm
 				sgl = (TW_SG_Entry *)((u32 *)oldcommand+oldcommand->size - (sizeof(TW_SG_Entry)/4) + pae);
 			else
 				sgl = (TW_SG_Entry *)((u32 *)oldcommand+TW_SGL_OUT(oldcommand->opcode__sgloffset));
-			sgl->address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1);
+			sgl->address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache));
 			sgl->length = cpu_to_le32(length);
 
 			oldcommand->size += pae;
diff --git a/drivers/scsi/3w-9xxx.h b/drivers/scsi/3w-9xxx.h
index d88cd3499bd5..e65dafda2e3e 100644
--- a/drivers/scsi/3w-9xxx.h
+++ b/drivers/scsi/3w-9xxx.h
@@ -588,7 +588,7 @@ typedef struct TAG_TW_Ioctl_Apache {
 	TW_Ioctl_Driver_Command driver_command;
         char padding[488];
 	TW_Command_Full firmware_command;
-	char data_buffer[1];
+	char data_buffer[];
 } TW_Ioctl_Buf_Apache;
 
 /* Lock structure for ioctl get/release lock */
@@ -604,7 +604,7 @@ typedef struct {
 	unsigned short	parameter_id;
 	unsigned short	parameter_size_bytes;
 	unsigned short  actual_parameter_size_bytes;
-	unsigned char	data[1];
+	unsigned char	data[];
 } TW_Param_Apache, *PTW_Param_Apache;
 
 /* Response queue */
-- 
2.26.2

[PATCH v4 2/3] scsi: 3w-9xxx: Reduce scope of structure packing

[Samuel Holland]

Currently, all command packet structs used by this driver are packed.
However, only one (TW_SG_Entry) actually needs to be packed, because it
uses 64-bit addresses at 32-bit alignment. To improve the quality of
generated code, stop packing all of the other command packet structs.
This requires adjusting the type of one misaligned "reserved" member.

After this change, pahole reports that only one type had its layout
change: the tw_compat_info member of TW_Device_Extension is now
naturally aligned.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---

Changes since v3: None.

---
 drivers/scsi/3w-9xxx.h | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/3w-9xxx.h b/drivers/scsi/3w-9xxx.h
index e65dafda2e3e..36b865eca67d 100644
--- a/drivers/scsi/3w-9xxx.h
+++ b/drivers/scsi/3w-9xxx.h
@@ -471,13 +471,17 @@ printk(KERN_WARNING "3w-9xxx: ERROR: (0x%02X:0x%04X): %s.\n",a,b,c); \
 #define TW_PADDING_LENGTH (sizeof(dma_addr_t) > 4 ? 8 : 0)
 #define TW_CPU_TO_SGL(x) (sizeof(dma_addr_t) > 4 ? cpu_to_le64(x) : cpu_to_le32(x))
 
-#pragma pack(1)
+#if IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT)
+typedef u64 twa_addr_t;
+#else
+typedef u32 twa_addr_t;
+#endif
 
 /* Scatter Gather List Entry */
 typedef struct TAG_TW_SG_Entry {
-	dma_addr_t address;
+	twa_addr_t address;
 	u32 length;
-} TW_SG_Entry;
+} __packed TW_SG_Entry;
 
 /* Command Packet */
 typedef struct TW_Command {
@@ -496,12 +500,12 @@ typedef struct TW_Command {
 		struct {
 			u32 lba;
 			TW_SG_Entry sgl[TW_ESCALADE_MAX_SGL_LENGTH];
-			dma_addr_t padding;
+			twa_addr_t padding;
 		} io;
 		struct {
 			TW_SG_Entry sgl[TW_ESCALADE_MAX_SGL_LENGTH];
 			u32 padding;
-			dma_addr_t padding2;
+			twa_addr_t padding2;
 		} param;
 	} byte8_offset;
 } TW_Command;
@@ -531,7 +535,7 @@ typedef struct TAG_TW_Command_Apache_Header {
 	unsigned char err_specific_desc[98];
 	struct {
 		unsigned char size_header;
-		unsigned short reserved;
+		unsigned char reserved[2];
 		unsigned char size_sense;
 	} header_desc;
 } TW_Command_Apache_Header;
@@ -631,8 +635,6 @@ typedef struct TAG_TW_Compatibility_Info
 	unsigned short fw_on_ctlr_build;
 } TW_Compatibility_Info;
 
-#pragma pack()
-
 typedef struct TAG_TW_Device_Extension {
 	u32                     __iomem *base_addr;
 	unsigned long	       	*generic_buffer_virt[TW_Q_LENGTH];
-- 
2.26.2

[PATCH v4 3/3] scsi: 3w-9xxx: Fix endianness issues in command packets

[Samuel Holland]

The controller expects all data it sends/receives to be little-endian.
Therefore, the packet struct definitions should use the __le16/32/64
types. Once those are correct, sparse reports several issues with the
driver code, which are fixed here as well.

The main issue observed was at the call to scsi_set_resid, where the
byteswapped parameter would eventually trigger the alignment check at
drivers/scsi/sd.c:2009. At that point, the kernel would continuously
complain about an "Unaligned partial completion", and no further I/O
could occur.

This gets the controller working on big endian powerpc64.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---

Changes since v3: None.

---
 drivers/scsi/3w-9xxx.c |  56 ++++++++++-----------
 drivers/scsi/3w-9xxx.h | 111 +++++++++++++++++++++--------------------
 2 files changed, 81 insertions(+), 86 deletions(-)

diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index aad9b3b73e15..593863317dc7 100644
--- a/drivers/scsi/3w-9xxx.c
+++ b/drivers/scsi/3w-9xxx.c
@@ -303,10 +303,10 @@ static int twa_aen_drain_queue(TW_Device_Extension *tw_dev, int no_check_reset)
 
 	/* Initialize sglist */
 	memset(&sglist, 0, sizeof(TW_SG_Entry));
-	sglist[0].length = TW_SECTOR_SIZE;
-	sglist[0].address = tw_dev->generic_buffer_phys[request_id];
+	sglist[0].length = cpu_to_le32(TW_SECTOR_SIZE);
+	sglist[0].address = TW_CPU_TO_SGL(tw_dev->generic_buffer_phys[request_id]);
 
-	if (sglist[0].address & TW_ALIGNMENT_9000_SGL) {
+	if (tw_dev->generic_buffer_phys[request_id] & TW_ALIGNMENT_9000_SGL) {
 		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1, "Found unaligned address during AEN drain");
 		goto out;
 	}
@@ -440,8 +440,8 @@ static int twa_aen_read_queue(TW_Device_Extension *tw_dev, int request_id)
 
 	/* Initialize sglist */
 	memset(&sglist, 0, sizeof(TW_SG_Entry));
-	sglist[0].length = TW_SECTOR_SIZE;
-	sglist[0].address = tw_dev->generic_buffer_phys[request_id];
+	sglist[0].length = cpu_to_le32(TW_SECTOR_SIZE);
+	sglist[0].address = TW_CPU_TO_SGL(tw_dev->generic_buffer_phys[request_id]);
 
 	/* Mark internal command */
 	tw_dev->srb[request_id] = NULL;
@@ -501,9 +501,8 @@ static void twa_aen_sync_time(TW_Device_Extension *tw_dev, int request_id)
            Sunday 12:00AM */
 	local_time = (ktime_get_real_seconds() - (sys_tz.tz_minuteswest * 60));
 	div_u64_rem(local_time - (3 * 86400), 604800, &schedulertime);
-	schedulertime = cpu_to_le32(schedulertime % 604800);
 
-	memcpy(param->data, &schedulertime, sizeof(u32));
+	memcpy(param->data, &(__le32){cpu_to_le32(schedulertime)}, sizeof(__le32));
 
 	/* Mark internal command */
 	tw_dev->srb[request_id] = NULL;
@@ -1004,19 +1003,13 @@ static int twa_fill_sense(TW_Device_Extension *tw_dev, int request_id, int copy_
 		if (print_host)
 			printk(KERN_WARNING "3w-9xxx: scsi%d: ERROR: (0x%02X:0x%04X): %s:%s.\n",
 			       tw_dev->host->host_no,
-			       TW_MESSAGE_SOURCE_CONTROLLER_ERROR,
-			       full_command_packet->header.status_block.error,
-			       error_str[0] == '\0' ?
-			       twa_string_lookup(twa_error_table,
-						 full_command_packet->header.status_block.error) : error_str,
+			       TW_MESSAGE_SOURCE_CONTROLLER_ERROR, error,
+			       error_str[0] ? error_str : twa_string_lookup(twa_error_table, error),
 			       full_command_packet->header.err_specific_desc);
 		else
 			printk(KERN_WARNING "3w-9xxx: ERROR: (0x%02X:0x%04X): %s:%s.\n",
-			       TW_MESSAGE_SOURCE_CONTROLLER_ERROR,
-			       full_command_packet->header.status_block.error,
-			       error_str[0] == '\0' ?
-			       twa_string_lookup(twa_error_table,
-						 full_command_packet->header.status_block.error) : error_str,
+			       TW_MESSAGE_SOURCE_CONTROLLER_ERROR, error,
+			       error_str[0] ? error_str : twa_string_lookup(twa_error_table, error),
 			       full_command_packet->header.err_specific_desc);
 	}
 
@@ -1133,12 +1126,11 @@ static int twa_initconnection(TW_Device_Extension *tw_dev, int message_credits,
 	tw_initconnect->opcode__reserved = TW_OPRES_IN(0, TW_OP_INIT_CONNECTION);
 	tw_initconnect->request_id = request_id;
 	tw_initconnect->message_credits = cpu_to_le16(message_credits);
-	tw_initconnect->features = set_features;
 
 	/* Turn on 64-bit sgl support if we need to */
-	tw_initconnect->features |= sizeof(dma_addr_t) > 4 ? 1 : 0;
+	set_features |= sizeof(dma_addr_t) > 4 ? 1 : 0;
 
-	tw_initconnect->features = cpu_to_le32(tw_initconnect->features);
+	tw_initconnect->features = cpu_to_le32(set_features);
 
 	if (set_features & TW_EXTENDED_INIT_CONNECT) {
 		tw_initconnect->size = TW_INIT_COMMAND_PACKET_SIZE_EXTENDED;
@@ -1351,8 +1343,10 @@ static irqreturn_t twa_interrupt(int irq, void *dev_instance)
 
 				/* Report residual bytes for single sgl */
 				if ((scsi_sg_count(cmd) <= 1) && (full_command_packet->command.newcommand.status == 0)) {
-					if (full_command_packet->command.newcommand.sg_list[0].length < scsi_bufflen(tw_dev->srb[request_id]))
-						scsi_set_resid(cmd, scsi_bufflen(cmd) - full_command_packet->command.newcommand.sg_list[0].length);
+					u32 length = le32_to_cpu(full_command_packet->command.newcommand.sg_list[0].length);
+
+					if (length < scsi_bufflen(cmd))
+						scsi_set_resid(cmd, scsi_bufflen(cmd) - length);
 				}
 
 				/* Now complete the io */
@@ -1394,13 +1388,13 @@ static void twa_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_comm
 	if (TW_OP_OUT(full_command_packet->command.newcommand.opcode__reserved) == TW_OP_EXECUTE_SCSI) {
 		newcommand = &full_command_packet->command.newcommand;
 		newcommand->request_id__lunl =
-			cpu_to_le16(TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->request_id__lunl), request_id));
+			TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->request_id__lunl), request_id);
 		if (length) {
 			newcommand->sg_list[0].address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache));
 			newcommand->sg_list[0].length = cpu_to_le32(length);
 		}
 		newcommand->sgl_entries__lunh =
-			cpu_to_le16(TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->sgl_entries__lunh), length ? 1 : 0));
+			TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->sgl_entries__lunh), length ? 1 : 0);
 	} else {
 		oldcommand = &full_command_packet->command.oldcommand;
 		oldcommand->request_id = request_id;
@@ -1841,10 +1835,10 @@ static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
 	if (srb) {
 		command_packet->unit = srb->device->id;
 		command_packet->request_id__lunl =
-			cpu_to_le16(TW_REQ_LUN_IN(srb->device->lun, request_id));
+			TW_REQ_LUN_IN(srb->device->lun, request_id);
 	} else {
 		command_packet->request_id__lunl =
-			cpu_to_le16(TW_REQ_LUN_IN(0, request_id));
+			TW_REQ_LUN_IN(0, request_id);
 		command_packet->unit = 0;
 	}
 
@@ -1876,19 +1870,19 @@ static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
 					}
 				}
 			}
-			command_packet->sgl_entries__lunh = cpu_to_le16(TW_REQ_LUN_IN((srb->device->lun >> 4), scsi_sg_count(tw_dev->srb[request_id])));
+			command_packet->sgl_entries__lunh = TW_REQ_LUN_IN((srb->device->lun >> 4), scsi_sg_count(tw_dev->srb[request_id]));
 		}
 	} else {
 		/* Internal cdb post */
 		for (i = 0; i < use_sg; i++) {
-			command_packet->sg_list[i].address = TW_CPU_TO_SGL(sglistarg[i].address);
-			command_packet->sg_list[i].length = cpu_to_le32(sglistarg[i].length);
+			command_packet->sg_list[i].address = sglistarg[i].address;
+			command_packet->sg_list[i].length = sglistarg[i].length;
 			if (command_packet->sg_list[i].address & TW_CPU_TO_SGL(TW_ALIGNMENT_9000_SGL)) {
 				TW_PRINTK(tw_dev->host, TW_DRIVER, 0x2f, "Found unaligned sgl address during internal post");
 				goto out;
 			}
 		}
-		command_packet->sgl_entries__lunh = cpu_to_le16(TW_REQ_LUN_IN(0, use_sg));
+		command_packet->sgl_entries__lunh = TW_REQ_LUN_IN(0, use_sg);
 	}
 
 	if (srb) {
@@ -2113,7 +2107,7 @@ static int twa_probe(struct pci_dev *pdev, const struct pci_device_id *dev_id)
 				     TW_PARAM_FWVER, TW_PARAM_FWVER_LENGTH),
 	       (char *)twa_get_param(tw_dev, 1, TW_VERSION_TABLE,
 				     TW_PARAM_BIOSVER, TW_PARAM_BIOSVER_LENGTH),
-	       le32_to_cpu(*(int *)twa_get_param(tw_dev, 2, TW_INFORMATION_TABLE,
+	       le32_to_cpu(*(__le32 *)twa_get_param(tw_dev, 2, TW_INFORMATION_TABLE,
 				     TW_PARAM_PORTCOUNT, TW_PARAM_PORTCOUNT_LENGTH)));
 
 	/* Try to enable MSI */
diff --git a/drivers/scsi/3w-9xxx.h b/drivers/scsi/3w-9xxx.h
index 36b865eca67d..f71ed3a64aaf 100644
--- a/drivers/scsi/3w-9xxx.h
+++ b/drivers/scsi/3w-9xxx.h
@@ -434,8 +434,8 @@ static twa_message_type twa_error_table[] = {
 #define TW_RESID_OUT(x) ((x >> 4) & 0xff)
 
 /* request_id: 12, lun: 4 */
-#define TW_REQ_LUN_IN(lun, request_id) (((lun << 12) & 0xf000) | (request_id & 0xfff))
-#define TW_LUN_OUT(lun) ((lun >> 12) & 0xf)
+#define TW_REQ_LUN_IN(lun, request_id) cpu_to_le16(((lun << 12) & 0xf000) | (request_id & 0xfff))
+#define TW_LUN_OUT(lun) ((le16_to_cpu(lun) >> 12) & 0xf)
 
 /* Macros */
 #define TW_CONTROL_REG_ADDR(x) (x->base_addr)
@@ -469,74 +469,75 @@ printk(KERN_WARNING "3w-9xxx: ERROR: (0x%02X:0x%04X): %s.\n",a,b,c); \
 #define TW_APACHE_MAX_SGL_LENGTH (sizeof(dma_addr_t) > 4 ? 72 : 109)
 #define TW_ESCALADE_MAX_SGL_LENGTH (sizeof(dma_addr_t) > 4 ? 41 : 62)
 #define TW_PADDING_LENGTH (sizeof(dma_addr_t) > 4 ? 8 : 0)
-#define TW_CPU_TO_SGL(x) (sizeof(dma_addr_t) > 4 ? cpu_to_le64(x) : cpu_to_le32(x))
 
 #if IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT)
-typedef u64 twa_addr_t;
+typedef __le64 twa_addr_t;
+#define TW_CPU_TO_SGL(x) cpu_to_le64(x)
 #else
-typedef u32 twa_addr_t;
+typedef __le32 twa_addr_t;
+#define TW_CPU_TO_SGL(x) cpu_to_le32(x)
 #endif
 
 /* Scatter Gather List Entry */
 typedef struct TAG_TW_SG_Entry {
-	twa_addr_t address;
-	u32 length;
+	twa_addr_t	address;
+	__le32		length;
 } __packed TW_SG_Entry;
 
 /* Command Packet */
 typedef struct TW_Command {
-	unsigned char opcode__sgloffset;
-	unsigned char size;
-	unsigned char request_id;
-	unsigned char unit__hostid;
+	u8	opcode__sgloffset;
+	u8	size;
+	u8	request_id;
+	u8	unit__hostid;
 	/* Second DWORD */
-	unsigned char status;
-	unsigned char flags;
+	u8	status;
+	u8	flags;
 	union {
-		unsigned short block_count;
-		unsigned short parameter_count;
+		__le16	block_count;
+		__le16	parameter_count;
 	} byte6_offset;
 	union {
 		struct {
-			u32 lba;
-			TW_SG_Entry sgl[TW_ESCALADE_MAX_SGL_LENGTH];
-			twa_addr_t padding;
+			__le32		lba;
+			TW_SG_Entry	sgl[TW_ESCALADE_MAX_SGL_LENGTH];
+			twa_addr_t	padding;
 		} io;
 		struct {
-			TW_SG_Entry sgl[TW_ESCALADE_MAX_SGL_LENGTH];
-			u32 padding;
-			twa_addr_t padding2;
+			TW_SG_Entry	sgl[TW_ESCALADE_MAX_SGL_LENGTH];
+			__le32		padding;
+			twa_addr_t	padding2;
 		} param;
 	} byte8_offset;
 } TW_Command;
 
 /* Command Packet for 9000+ controllers */
 typedef struct TAG_TW_Command_Apache {
-	unsigned char opcode__reserved;
-	unsigned char unit;
-	unsigned short request_id__lunl;
-	unsigned char status;
-	unsigned char sgl_offset;
-	unsigned short sgl_entries__lunh;
-	unsigned char cdb[16];
-	TW_SG_Entry sg_list[TW_APACHE_MAX_SGL_LENGTH];
-	unsigned char padding[TW_PADDING_LENGTH];
+	u8		opcode__reserved;
+	u8		unit;
+	__le16		request_id__lunl;
+	u8		status;
+	u8		sgl_offset;
+	__le16		sgl_entries__lunh;
+	u8		cdb[16];
+	TW_SG_Entry	sg_list[TW_APACHE_MAX_SGL_LENGTH];
+	u8		padding[TW_PADDING_LENGTH];
 } TW_Command_Apache;
 
 /* New command packet header */
 typedef struct TAG_TW_Command_Apache_Header {
 	unsigned char sense_data[TW_SENSE_DATA_LENGTH];
 	struct {
-		char reserved[4];
-		unsigned short error;
-		unsigned char padding;
-		unsigned char severity__reserved;
+		u8	reserved[4];
+		__le16	error;
+		u8	padding;
+		u8	severity__reserved;
 	} status_block;
 	unsigned char err_specific_desc[98];
 	struct {
-		unsigned char size_header;
-		unsigned char reserved[2];
-		unsigned char size_sense;
+		u8	size_header;
+		u8	reserved[2];
+		u8	size_sense;
 	} header_desc;
 } TW_Command_Apache_Header;
 
@@ -551,19 +552,19 @@ typedef struct TAG_TW_Command_Full {
 
 /* Initconnection structure */
 typedef struct TAG_TW_Initconnect {
-	unsigned char opcode__reserved;
-	unsigned char size;
-	unsigned char request_id;
-	unsigned char res2;
-	unsigned char status;
-	unsigned char flags;
-	unsigned short message_credits;
-	u32 features;
-	unsigned short fw_srl;
-	unsigned short fw_arch_id;
-	unsigned short fw_branch;
-	unsigned short fw_build;
-	u32 result;
+	u8	opcode__reserved;
+	u8	size;
+	u8	request_id;
+	u8	res2;
+	u8	status;
+	u8	flags;
+	__le16	message_credits;
+	__le32	features;
+	__le16	fw_srl;
+	__le16	fw_arch_id;
+	__le16	fw_branch;
+	__le16	fw_build;
+	__le32	result;
 } TW_Initconnect;
 
 /* Event info structure */
@@ -604,11 +605,11 @@ typedef struct TAG_TW_Lock {
 
 /* GetParam descriptor */
 typedef struct {
-	unsigned short	table_id;
-	unsigned short	parameter_id;
-	unsigned short	parameter_size_bytes;
-	unsigned short  actual_parameter_size_bytes;
-	unsigned char	data[];
+	__le16	table_id;
+	__le16	parameter_id;
+	__le16	parameter_size_bytes;
+	__le16  actual_parameter_size_bytes;
+	u8	data[];
 } TW_Param_Apache, *PTW_Param_Apache;
 
 /* Response queue */
-- 
2.26.2

Re: [PATCH v4 3/3] scsi: 3w-9xxx: Fix endianness issues in command packets

[Samuel Holland]

On 9/2/20 10:44 PM, Samuel Holland wrote:
> The controller expects all data it sends/receives to be little-endian.
> Therefore, the packet struct definitions should use the __le16/32/64
> types. Once those are correct, sparse reports several issues with the
> driver code, which are fixed here as well.
> 
> The main issue observed was at the call to scsi_set_resid, where the
> byteswapped parameter would eventually trigger the alignment check at
> drivers/scsi/sd.c:2009. At that point, the kernel would continuously
> complain about an "Unaligned partial completion", and no further I/O
> could occur.
> 
> This gets the controller working on big endian powerpc64.
> 
> Signed-off-by: Samuel Holland <samuel@sholland.org>

I believe I addressed all previous comments to this series in v4.
Is there anything preventing it from being merged? Do I need to resend it?

Regards,
Samuel