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Date: Thu, 26 Jun 2014 05:13:41 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Paul M Stillwell Jr <paul.m.stillwell.jr@...el.com>,
netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 02/14] i40e/i40evf: Big endian fixes for handling HMC
From: Paul M Stillwell Jr <paul.m.stillwell.jr@...el.com>
Fix HMC handling for big endian architectures.
Change-ID: Id8c46fc341815d47bfe0af8b819f0ab9a1e9e515
Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/i40e/i40e_lan_hmc.c | 247 ++++++++++++++++++-----
drivers/net/ethernet/intel/i40e/i40e_lan_hmc.h | 28 ++-
drivers/net/ethernet/intel/i40evf/i40e_lan_hmc.h | 28 ++-
3 files changed, 236 insertions(+), 67 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_lan_hmc.c b/drivers/net/ethernet/intel/i40e/i40e_lan_hmc.c
index 870ab1e..5a603a5 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_lan_hmc.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_lan_hmc.c
@@ -747,6 +747,194 @@ static struct i40e_context_ele i40e_hmc_rxq_ce_info[] = {
};
/**
+ * i40e_write_byte - replace HMC context byte
+ * @hmc_bits: pointer to the HMC memory
+ * @ce_info: a description of the struct to be read from
+ * @src: the struct to be read from
+ **/
+static void i40e_write_byte(u8 *hmc_bits,
+ struct i40e_context_ele *ce_info,
+ u8 *src)
+{
+ u8 src_byte, dest_byte, mask;
+ u8 *from, *dest;
+ u16 shift_width;
+
+ /* copy from the next struct field */
+ from = src + ce_info->offset;
+
+ /* prepare the bits and mask */
+ shift_width = ce_info->lsb % 8;
+ mask = ((u8)1 << ce_info->width) - 1;
+
+ src_byte = *from;
+ src_byte &= mask;
+
+ /* shift to correct alignment */
+ mask <<= shift_width;
+ src_byte <<= shift_width;
+
+ /* get the current bits from the target bit string */
+ dest = hmc_bits + (ce_info->lsb / 8);
+
+ memcpy(&dest_byte, dest, sizeof(dest_byte));
+
+ dest_byte &= ~mask; /* get the bits not changing */
+ dest_byte |= src_byte; /* add in the new bits */
+
+ /* put it all back */
+ memcpy(dest, &dest_byte, sizeof(dest_byte));
+}
+
+/**
+ * i40e_write_word - replace HMC context word
+ * @hmc_bits: pointer to the HMC memory
+ * @ce_info: a description of the struct to be read from
+ * @src: the struct to be read from
+ **/
+static void i40e_write_word(u8 *hmc_bits,
+ struct i40e_context_ele *ce_info,
+ u8 *src)
+{
+ u16 src_word, mask;
+ u8 *from, *dest;
+ u16 shift_width;
+ __le16 dest_word;
+
+ /* copy from the next struct field */
+ from = src + ce_info->offset;
+
+ /* prepare the bits and mask */
+ shift_width = ce_info->lsb % 8;
+ mask = ((u16)1 << ce_info->width) - 1;
+
+ /* don't swizzle the bits until after the mask because the mask bits
+ * will be in a different bit position on big endian machines
+ */
+ src_word = *(u16 *)from;
+ src_word &= mask;
+
+ /* shift to correct alignment */
+ mask <<= shift_width;
+ src_word <<= shift_width;
+
+ /* get the current bits from the target bit string */
+ dest = hmc_bits + (ce_info->lsb / 8);
+
+ memcpy(&dest_word, dest, sizeof(dest_word));
+
+ dest_word &= ~(cpu_to_le16(mask)); /* get the bits not changing */
+ dest_word |= cpu_to_le16(src_word); /* add in the new bits */
+
+ /* put it all back */
+ memcpy(dest, &dest_word, sizeof(dest_word));
+}
+
+/**
+ * i40e_write_dword - replace HMC context dword
+ * @hmc_bits: pointer to the HMC memory
+ * @ce_info: a description of the struct to be read from
+ * @src: the struct to be read from
+ **/
+static void i40e_write_dword(u8 *hmc_bits,
+ struct i40e_context_ele *ce_info,
+ u8 *src)
+{
+ u32 src_dword, mask;
+ u8 *from, *dest;
+ u16 shift_width;
+ __le32 dest_dword;
+
+ /* copy from the next struct field */
+ from = src + ce_info->offset;
+
+ /* prepare the bits and mask */
+ shift_width = ce_info->lsb % 8;
+
+ /* if the field width is exactly 32 on an x86 machine, then the shift
+ * operation will not work because the SHL instructions count is masked
+ * to 5 bits so the shift will do nothing
+ */
+ if (ce_info->width < 32)
+ mask = ((u32)1 << ce_info->width) - 1;
+ else
+ mask = -1;
+
+ /* don't swizzle the bits until after the mask because the mask bits
+ * will be in a different bit position on big endian machines
+ */
+ src_dword = *(u32 *)from;
+ src_dword &= mask;
+
+ /* shift to correct alignment */
+ mask <<= shift_width;
+ src_dword <<= shift_width;
+
+ /* get the current bits from the target bit string */
+ dest = hmc_bits + (ce_info->lsb / 8);
+
+ memcpy(&dest_dword, dest, sizeof(dest_dword));
+
+ dest_dword &= ~(cpu_to_le32(mask)); /* get the bits not changing */
+ dest_dword |= cpu_to_le32(src_dword); /* add in the new bits */
+
+ /* put it all back */
+ memcpy(dest, &dest_dword, sizeof(dest_dword));
+}
+
+/**
+ * i40e_write_qword - replace HMC context qword
+ * @hmc_bits: pointer to the HMC memory
+ * @ce_info: a description of the struct to be read from
+ * @src: the struct to be read from
+ **/
+static void i40e_write_qword(u8 *hmc_bits,
+ struct i40e_context_ele *ce_info,
+ u8 *src)
+{
+ u64 src_qword, mask;
+ u8 *from, *dest;
+ u16 shift_width;
+ __le64 dest_qword;
+
+ /* copy from the next struct field */
+ from = src + ce_info->offset;
+
+ /* prepare the bits and mask */
+ shift_width = ce_info->lsb % 8;
+
+ /* if the field width is exactly 64 on an x86 machine, then the shift
+ * operation will not work because the SHL instructions count is masked
+ * to 6 bits so the shift will do nothing
+ */
+ if (ce_info->width < 64)
+ mask = ((u64)1 << ce_info->width) - 1;
+ else
+ mask = -1;
+
+ /* don't swizzle the bits until after the mask because the mask bits
+ * will be in a different bit position on big endian machines
+ */
+ src_qword = *(u64 *)from;
+ src_qword &= mask;
+
+ /* shift to correct alignment */
+ mask <<= shift_width;
+ src_qword <<= shift_width;
+
+ /* get the current bits from the target bit string */
+ dest = hmc_bits + (ce_info->lsb / 8);
+
+ memcpy(&dest_qword, dest, sizeof(dest_qword));
+
+ dest_qword &= ~(cpu_to_le64(mask)); /* get the bits not changing */
+ dest_qword |= cpu_to_le64(src_qword); /* add in the new bits */
+
+ /* put it all back */
+ memcpy(dest, &dest_qword, sizeof(dest_qword));
+}
+
+/**
* i40e_clear_hmc_context - zero out the HMC context bits
* @hw: the hardware struct
* @context_bytes: pointer to the context bit array (DMA memory)
@@ -772,71 +960,28 @@ static i40e_status i40e_set_hmc_context(u8 *context_bytes,
struct i40e_context_ele *ce_info,
u8 *dest)
{
- u16 shift_width;
- u64 bitfield;
- u8 hi_byte;
- u8 hi_mask;
- u64 t_bits;
- u64 mask;
- u8 *p;
int f;
for (f = 0; ce_info[f].width != 0; f++) {
- /* clear out the field */
- bitfield = 0;
- /* copy from the next struct field */
- p = dest + ce_info[f].offset;
+ /* we have to deal with each element of the HMC using the
+ * correct size so that we are correct regardless of the
+ * endianness of the machine
+ */
switch (ce_info[f].size_of) {
case 1:
- bitfield = *p;
+ i40e_write_byte(context_bytes, &ce_info[f], dest);
break;
case 2:
- bitfield = cpu_to_le16(*(u16 *)p);
+ i40e_write_word(context_bytes, &ce_info[f], dest);
break;
case 4:
- bitfield = cpu_to_le32(*(u32 *)p);
+ i40e_write_dword(context_bytes, &ce_info[f], dest);
break;
case 8:
- bitfield = cpu_to_le64(*(u64 *)p);
+ i40e_write_qword(context_bytes, &ce_info[f], dest);
break;
}
-
- /* prepare the bits and mask */
- shift_width = ce_info[f].lsb % 8;
- mask = ((u64)1 << ce_info[f].width) - 1;
-
- /* save upper bytes for special case */
- hi_mask = (u8)((mask >> 56) & 0xff);
- hi_byte = (u8)((bitfield >> 56) & 0xff);
-
- /* shift to correct alignment */
- mask <<= shift_width;
- bitfield <<= shift_width;
-
- /* get the current bits from the target bit string */
- p = context_bytes + (ce_info[f].lsb / 8);
- memcpy(&t_bits, p, sizeof(u64));
-
- t_bits &= ~mask; /* get the bits not changing */
- t_bits |= bitfield; /* add in the new bits */
-
- /* put it all back */
- memcpy(p, &t_bits, sizeof(u64));
-
- /* deal with the special case if needed
- * example: 62 bit field that starts in bit 5 of first byte
- * will overlap 3 bits into byte 9
- */
- if ((shift_width + ce_info[f].width) > 64) {
- u8 byte;
-
- hi_mask >>= (8 - shift_width);
- hi_byte >>= (8 - shift_width);
- byte = p[8] & ~hi_mask; /* get the bits not changing */
- byte |= hi_byte; /* add in the new bits */
- p[8] = byte; /* put it back */
- }
}
return 0;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_lan_hmc.h b/drivers/net/ethernet/intel/i40e/i40e_lan_hmc.h
index eb65fe2..e74128d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_lan_hmc.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_lan_hmc.h
@@ -32,16 +32,22 @@ struct i40e_hw;
/* HMC element context information */
-/* Rx queue context data */
+/* Rx queue context data
+ *
+ * The sizes of the variables may be larger than needed due to crossing byte
+ * boundaries. If we do not have the width of the variable set to the correct
+ * size then we could end up shifting bits off the top of the variable when the
+ * variable is at the top of a byte and crosses over into the next byte.
+ */
struct i40e_hmc_obj_rxq {
u16 head;
- u8 cpuid;
+ u16 cpuid; /* bigger than needed, see above for reason */
u64 base;
u16 qlen;
#define I40E_RXQ_CTX_DBUFF_SHIFT 7
- u8 dbuff;
+ u16 dbuff; /* bigger than needed, see above for reason */
#define I40E_RXQ_CTX_HBUFF_SHIFT 6
- u8 hbuff;
+ u16 hbuff; /* bigger than needed, see above for reason */
u8 dtype;
u8 dsize;
u8 crcstrip;
@@ -50,16 +56,22 @@ struct i40e_hmc_obj_rxq {
u8 hsplit_0;
u8 hsplit_1;
u8 showiv;
- u16 rxmax;
+ u32 rxmax; /* bigger than needed, see above for reason */
u8 tphrdesc_ena;
u8 tphwdesc_ena;
u8 tphdata_ena;
u8 tphhead_ena;
- u8 lrxqthresh;
+ u16 lrxqthresh; /* bigger than needed, see above for reason */
u8 prefena; /* NOTE: normally must be set to 1 at init */
};
-/* Tx queue context data */
+/* Tx queue context data
+*
+* The sizes of the variables may be larger than needed due to crossing byte
+* boundaries. If we do not have the width of the variable set to the correct
+* size then we could end up shifting bits off the top of the variable when the
+* variable is at the top of a byte and crosses over into the next byte.
+*/
struct i40e_hmc_obj_txq {
u16 head;
u8 new_context;
@@ -69,7 +81,7 @@ struct i40e_hmc_obj_txq {
u8 fd_ena;
u8 alt_vlan_ena;
u16 thead_wb;
- u16 cpuid;
+ u8 cpuid;
u8 head_wb_ena;
u16 qlen;
u8 tphrdesc_ena;
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_lan_hmc.h b/drivers/net/ethernet/intel/i40evf/i40e_lan_hmc.h
index d6f7622..a5d7987 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_lan_hmc.h
+++ b/drivers/net/ethernet/intel/i40evf/i40e_lan_hmc.h
@@ -32,16 +32,22 @@ struct i40e_hw;
/* HMC element context information */
-/* Rx queue context data */
+/* Rx queue context data
+ *
+ * The sizes of the variables may be larger than needed due to crossing byte
+ * boundaries. If we do not have the width of the variable set to the correct
+ * size then we could end up shifting bits off the top of the variable when the
+ * variable is at the top of a byte and crosses over into the next byte.
+ */
struct i40e_hmc_obj_rxq {
u16 head;
- u8 cpuid;
+ u16 cpuid; /* bigger than needed, see above for reason */
u64 base;
u16 qlen;
#define I40E_RXQ_CTX_DBUFF_SHIFT 7
- u8 dbuff;
+ u16 dbuff; /* bigger than needed, see above for reason */
#define I40E_RXQ_CTX_HBUFF_SHIFT 6
- u8 hbuff;
+ u16 hbuff; /* bigger than needed, see above for reason */
u8 dtype;
u8 dsize;
u8 crcstrip;
@@ -50,16 +56,22 @@ struct i40e_hmc_obj_rxq {
u8 hsplit_0;
u8 hsplit_1;
u8 showiv;
- u16 rxmax;
+ u32 rxmax; /* bigger than needed, see above for reason */
u8 tphrdesc_ena;
u8 tphwdesc_ena;
u8 tphdata_ena;
u8 tphhead_ena;
- u8 lrxqthresh;
+ u16 lrxqthresh; /* bigger than needed, see above for reason */
u8 prefena; /* NOTE: normally must be set to 1 at init */
};
-/* Tx queue context data */
+/* Tx queue context data
+*
+* The sizes of the variables may be larger than needed due to crossing byte
+* boundaries. If we do not have the width of the variable set to the correct
+* size then we could end up shifting bits off the top of the variable when the
+* variable is at the top of a byte and crosses over into the next byte.
+*/
struct i40e_hmc_obj_txq {
u16 head;
u8 new_context;
@@ -69,7 +81,7 @@ struct i40e_hmc_obj_txq {
u8 fd_ena;
u8 alt_vlan_ena;
u16 thead_wb;
- u16 cpuid;
+ u8 cpuid;
u8 head_wb_ena;
u16 qlen;
u8 tphrdesc_ena;
--
1.9.3
--
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