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linux_dsm_epyc7002/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
Luo Jiaxing 31f2760e41 net: stmmac: set get_rx_header_len() as void for it didn't have any error code to return 
We found the following warning when using W=1 to build kernel:

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:3634:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
int ret, coe = priv->hw->rx_csum;

When digging stmmac_get_rx_header_len(), dwmac4_get_rx_header_len() and
dwxgmac2_get_rx_header_len() return 0 only, without any error code to
report. Therefore, it's better to define get_rx_header_len() as void.

Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-11 14:37:34 -07:00

380 lines
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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
* stmmac XGMAC support.
*/
#include <linux/stmmac.h>
#include "common.h"
#include "dwxgmac2.h"
static int dwxgmac2_get_tx_status(void *data, struct stmmac_extra_stats *x,
struct dma_desc *p, void __iomem *ioaddr)
{
unsigned int tdes3 = le32_to_cpu(p->des3);
int ret = tx_done;
if (unlikely(tdes3 & XGMAC_TDES3_OWN))
return tx_dma_own;
if (likely(!(tdes3 & XGMAC_TDES3_LD)))
return tx_not_ls;
return ret;
}
static int dwxgmac2_get_rx_status(void *data, struct stmmac_extra_stats *x,
struct dma_desc *p)
{
unsigned int rdes3 = le32_to_cpu(p->des3);
if (unlikely(rdes3 & XGMAC_RDES3_OWN))
return dma_own;
if (unlikely(rdes3 & XGMAC_RDES3_CTXT))
return discard_frame;
if (likely(!(rdes3 & XGMAC_RDES3_LD)))
return rx_not_ls;
if (unlikely((rdes3 & XGMAC_RDES3_ES) && (rdes3 & XGMAC_RDES3_LD)))
return discard_frame;
return good_frame;
}
static int dwxgmac2_get_tx_len(struct dma_desc *p)
{
return (le32_to_cpu(p->des2) & XGMAC_TDES2_B1L);
}
static int dwxgmac2_get_tx_owner(struct dma_desc *p)
{
return (le32_to_cpu(p->des3) & XGMAC_TDES3_OWN) > 0;
}
static void dwxgmac2_set_tx_owner(struct dma_desc *p)
{
p->des3 |= cpu_to_le32(XGMAC_TDES3_OWN);
}
static void dwxgmac2_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
{
p->des3 |= cpu_to_le32(XGMAC_RDES3_OWN);
if (!disable_rx_ic)
p->des3 |= cpu_to_le32(XGMAC_RDES3_IOC);
}
static int dwxgmac2_get_tx_ls(struct dma_desc *p)
{
return (le32_to_cpu(p->des3) & XGMAC_RDES3_LD) > 0;
}
static int dwxgmac2_get_rx_frame_len(struct dma_desc *p, int rx_coe)
{
return (le32_to_cpu(p->des3) & XGMAC_RDES3_PL);
}
static void dwxgmac2_enable_tx_timestamp(struct dma_desc *p)
{
p->des2 |= cpu_to_le32(XGMAC_TDES2_TTSE);
}
static int dwxgmac2_get_tx_timestamp_status(struct dma_desc *p)
{
return 0; /* Not supported */
}
static inline void dwxgmac2_get_timestamp(void *desc, u32 ats, u64 *ts)
{
struct dma_desc *p = (struct dma_desc *)desc;
u64 ns = 0;
ns += le32_to_cpu(p->des1) * 1000000000ULL;
ns += le32_to_cpu(p->des0);
*ts = ns;
}
static int dwxgmac2_rx_check_timestamp(void *desc)
{
struct dma_desc *p = (struct dma_desc *)desc;
unsigned int rdes3 = le32_to_cpu(p->des3);
bool desc_valid, ts_valid;
dma_rmb();
desc_valid = !(rdes3 & XGMAC_RDES3_OWN) && (rdes3 & XGMAC_RDES3_CTXT);
ts_valid = !(rdes3 & XGMAC_RDES3_TSD) && (rdes3 & XGMAC_RDES3_TSA);
if (likely(desc_valid && ts_valid)) {
if ((p->des0 == 0xffffffff) && (p->des1 == 0xffffffff))
return -EINVAL;
return 0;
}
return -EINVAL;
}
static int dwxgmac2_get_rx_timestamp_status(void *desc, void *next_desc,
u32 ats)
{
struct dma_desc *p = (struct dma_desc *)desc;
unsigned int rdes3 = le32_to_cpu(p->des3);
int ret = -EBUSY;
if (likely(rdes3 & XGMAC_RDES3_CDA))
ret = dwxgmac2_rx_check_timestamp(next_desc);
return !ret;
}
static void dwxgmac2_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
int mode, int end, int bfsize)
{
dwxgmac2_set_rx_owner(p, disable_rx_ic);
}
static void dwxgmac2_init_tx_desc(struct dma_desc *p, int mode, int end)
{
p->des0 = 0;
p->des1 = 0;
p->des2 = 0;
p->des3 = 0;
}
static void dwxgmac2_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
bool csum_flag, int mode, bool tx_own,
bool ls, unsigned int tot_pkt_len)
{
unsigned int tdes3 = le32_to_cpu(p->des3);
p->des2 |= cpu_to_le32(len & XGMAC_TDES2_B1L);
tdes3 |= tot_pkt_len & XGMAC_TDES3_FL;
if (is_fs)
tdes3 |= XGMAC_TDES3_FD;
else
tdes3 &= ~XGMAC_TDES3_FD;
if (csum_flag)
tdes3 |= 0x3 << XGMAC_TDES3_CIC_SHIFT;
else
tdes3 &= ~XGMAC_TDES3_CIC;
if (ls)
tdes3 |= XGMAC_TDES3_LD;
else
tdes3 &= ~XGMAC_TDES3_LD;
/* Finally set the OWN bit. Later the DMA will start! */
if (tx_own)
tdes3 |= XGMAC_TDES3_OWN;
if (is_fs && tx_own)
/* When the own bit, for the first frame, has to be set, all
* descriptors for the same frame has to be set before, to
* avoid race condition.
*/
dma_wmb();
p->des3 = cpu_to_le32(tdes3);
}
static void dwxgmac2_prepare_tso_tx_desc(struct dma_desc *p, int is_fs,
int len1, int len2, bool tx_own,
bool ls, unsigned int tcphdrlen,
unsigned int tcppayloadlen)
{
unsigned int tdes3 = le32_to_cpu(p->des3);
if (len1)
p->des2 |= cpu_to_le32(len1 & XGMAC_TDES2_B1L);
if (len2)
p->des2 |= cpu_to_le32((len2 << XGMAC_TDES2_B2L_SHIFT) &
XGMAC_TDES2_B2L);
if (is_fs) {
tdes3 |= XGMAC_TDES3_FD | XGMAC_TDES3_TSE;
tdes3 |= (tcphdrlen << XGMAC_TDES3_THL_SHIFT) &
XGMAC_TDES3_THL;
tdes3 |= tcppayloadlen & XGMAC_TDES3_TPL;
} else {
tdes3 &= ~XGMAC_TDES3_FD;
}
if (ls)
tdes3 |= XGMAC_TDES3_LD;
else
tdes3 &= ~XGMAC_TDES3_LD;
/* Finally set the OWN bit. Later the DMA will start! */
if (tx_own)
tdes3 |= XGMAC_TDES3_OWN;
if (is_fs && tx_own)
/* When the own bit, for the first frame, has to be set, all
* descriptors for the same frame has to be set before, to
* avoid race condition.
*/
dma_wmb();
p->des3 = cpu_to_le32(tdes3);
}
static void dwxgmac2_release_tx_desc(struct dma_desc *p, int mode)
{
p->des0 = 0;
p->des1 = 0;
p->des2 = 0;
p->des3 = 0;
}
static void dwxgmac2_set_tx_ic(struct dma_desc *p)
{
p->des2 |= cpu_to_le32(XGMAC_TDES2_IOC);
}
static void dwxgmac2_set_mss(struct dma_desc *p, unsigned int mss)
{
p->des0 = 0;
p->des1 = 0;
p->des2 = cpu_to_le32(mss);
p->des3 = cpu_to_le32(XGMAC_TDES3_CTXT | XGMAC_TDES3_TCMSSV);
}
static void dwxgmac2_get_addr(struct dma_desc *p, unsigned int *addr)
{
*addr = le32_to_cpu(p->des0);
}
static void dwxgmac2_set_addr(struct dma_desc *p, dma_addr_t addr)
{
p->des0 = cpu_to_le32(lower_32_bits(addr));
p->des1 = cpu_to_le32(upper_32_bits(addr));
}
static void dwxgmac2_clear(struct dma_desc *p)
{
p->des0 = 0;
p->des1 = 0;
p->des2 = 0;
p->des3 = 0;
}
static int dwxgmac2_get_rx_hash(struct dma_desc *p, u32 *hash,
enum pkt_hash_types *type)
{
unsigned int rdes3 = le32_to_cpu(p->des3);
u32 ptype;
if (rdes3 & XGMAC_RDES3_RSV) {
ptype = (rdes3 & XGMAC_RDES3_L34T) >> XGMAC_RDES3_L34T_SHIFT;
switch (ptype) {
case XGMAC_L34T_IP4TCP:
case XGMAC_L34T_IP4UDP:
case XGMAC_L34T_IP6TCP:
case XGMAC_L34T_IP6UDP:
*type = PKT_HASH_TYPE_L4;
break;
default:
*type = PKT_HASH_TYPE_L3;
break;
}
*hash = le32_to_cpu(p->des1);
return 0;
}
return -EINVAL;
}
static void dwxgmac2_get_rx_header_len(struct dma_desc *p, unsigned int *len)
{
if (le32_to_cpu(p->des3) & XGMAC_RDES3_L34T)
*len = le32_to_cpu(p->des2) & XGMAC_RDES2_HL;
}
static void dwxgmac2_set_sec_addr(struct dma_desc *p, dma_addr_t addr)
{
p->des2 = cpu_to_le32(lower_32_bits(addr));
p->des3 = cpu_to_le32(upper_32_bits(addr));
}
static void dwxgmac2_set_sarc(struct dma_desc *p, u32 sarc_type)
{
sarc_type <<= XGMAC_TDES3_SAIC_SHIFT;
p->des3 |= cpu_to_le32(sarc_type & XGMAC_TDES3_SAIC);
}
static void dwxgmac2_set_vlan_tag(struct dma_desc *p, u16 tag, u16 inner_tag,
u32 inner_type)
{
p->des0 = 0;
p->des1 = 0;
p->des2 = 0;
p->des3 = 0;
/* Inner VLAN */
if (inner_type) {
u32 des = inner_tag << XGMAC_TDES2_IVT_SHIFT;
des &= XGMAC_TDES2_IVT;
p->des2 = cpu_to_le32(des);
des = inner_type << XGMAC_TDES3_IVTIR_SHIFT;
des &= XGMAC_TDES3_IVTIR;
p->des3 = cpu_to_le32(des | XGMAC_TDES3_IVLTV);
}
/* Outer VLAN */
p->des3 |= cpu_to_le32(tag & XGMAC_TDES3_VT);
p->des3 |= cpu_to_le32(XGMAC_TDES3_VLTV);
p->des3 |= cpu_to_le32(XGMAC_TDES3_CTXT);
}
static void dwxgmac2_set_vlan(struct dma_desc *p, u32 type)
{
type <<= XGMAC_TDES2_VTIR_SHIFT;
p->des2 |= cpu_to_le32(type & XGMAC_TDES2_VTIR);
}
static void dwxgmac2_set_tbs(struct dma_edesc *p, u32 sec, u32 nsec)
{
p->des4 = cpu_to_le32((sec & XGMAC_TDES0_LT) | XGMAC_TDES0_LTV);
p->des5 = cpu_to_le32(nsec & XGMAC_TDES1_LT);
p->des6 = 0;
p->des7 = 0;
}
const struct stmmac_desc_ops dwxgmac210_desc_ops = {
.tx_status = dwxgmac2_get_tx_status,
.rx_status = dwxgmac2_get_rx_status,
.get_tx_len = dwxgmac2_get_tx_len,
.get_tx_owner = dwxgmac2_get_tx_owner,
.set_tx_owner = dwxgmac2_set_tx_owner,
.set_rx_owner = dwxgmac2_set_rx_owner,
.get_tx_ls = dwxgmac2_get_tx_ls,
.get_rx_frame_len = dwxgmac2_get_rx_frame_len,
.enable_tx_timestamp = dwxgmac2_enable_tx_timestamp,
.get_tx_timestamp_status = dwxgmac2_get_tx_timestamp_status,
.get_rx_timestamp_status = dwxgmac2_get_rx_timestamp_status,
.get_timestamp = dwxgmac2_get_timestamp,
.set_tx_ic = dwxgmac2_set_tx_ic,
.prepare_tx_desc = dwxgmac2_prepare_tx_desc,
.prepare_tso_tx_desc = dwxgmac2_prepare_tso_tx_desc,
.release_tx_desc = dwxgmac2_release_tx_desc,
.init_rx_desc = dwxgmac2_init_rx_desc,
.init_tx_desc = dwxgmac2_init_tx_desc,
.set_mss = dwxgmac2_set_mss,
.get_addr = dwxgmac2_get_addr,
.set_addr = dwxgmac2_set_addr,
.clear = dwxgmac2_clear,
.get_rx_hash = dwxgmac2_get_rx_hash,
.get_rx_header_len = dwxgmac2_get_rx_header_len,
.set_sec_addr = dwxgmac2_set_sec_addr,
.set_sarc = dwxgmac2_set_sarc,
.set_vlan_tag = dwxgmac2_set_vlan_tag,
.set_vlan = dwxgmac2_set_vlan,
.set_tbs = dwxgmac2_set_tbs,
};
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