Skip to content

Commit

Permalink
net: stmmac: fix dma physical address of descriptor when display ring
Browse files Browse the repository at this point in the history 
[ Upstream commit bfaf91c ]

Driver uses dma_alloc_coherent to allocate dma memory for descriptors,
dma_alloc_coherent will return both the virtual address and physical
address. AFAIK, virt_to_phys could not convert virtual address to
physical address, for which memory is allocated by dma_alloc_coherent.

dwmac4_display_ring() function is broken for various descriptor, it only
support normal descriptor(struct dma_desc) now, this patch also extends to
support all descriptor types.

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
  • Loading branch information
@gregkh
Joakim Zhang authored and gregkh committed Mar 30, 2021
1 parent ba5ec41 commit 61f976d
Show file tree
Hide file tree
Showing 5 changed files with 94 additions and 34 deletions.
50 changes: 42 additions & 8 deletions drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -402,19 +402,53 @@ static void dwmac4_rd_set_tx_ic(struct dma_desc *p)
p->des2 |= cpu_to_le32(TDES2_INTERRUPT_ON_COMPLETION);
}

static void dwmac4_display_ring(void *head, unsigned int size, bool rx)
static void dwmac4_display_ring(void *head, unsigned int size, bool rx,
dma_addr_t dma_rx_phy, unsigned int desc_size)
{
struct dma_desc *p = (struct dma_desc *)head;
dma_addr_t dma_addr;
int i;

pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");

for (i = 0; i < size; i++) {
pr_info("%03d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
i, (unsigned int)virt_to_phys(p),
le32_to_cpu(p->des0), le32_to_cpu(p->des1),
le32_to_cpu(p->des2), le32_to_cpu(p->des3));
p++;
if (desc_size == sizeof(struct dma_desc)) {
struct dma_desc *p = (struct dma_desc *)head;

for (i = 0; i < size; i++) {
dma_addr = dma_rx_phy + i * sizeof(*p);
pr_info("%03d [%pad]: 0x%x 0x%x 0x%x 0x%x\n",
i, &dma_addr,
le32_to_cpu(p->des0), le32_to_cpu(p->des1),
le32_to_cpu(p->des2), le32_to_cpu(p->des3));
p++;
}
} else if (desc_size == sizeof(struct dma_extended_desc)) {
struct dma_extended_desc *extp = (struct dma_extended_desc *)head;

for (i = 0; i < size; i++) {
dma_addr = dma_rx_phy + i * sizeof(*extp);
pr_info("%03d [%pad]: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
i, &dma_addr,
le32_to_cpu(extp->basic.des0), le32_to_cpu(extp->basic.des1),
le32_to_cpu(extp->basic.des2), le32_to_cpu(extp->basic.des3),
le32_to_cpu(extp->des4), le32_to_cpu(extp->des5),
le32_to_cpu(extp->des6), le32_to_cpu(extp->des7));
extp++;
}
} else if (desc_size == sizeof(struct dma_edesc)) {
struct dma_edesc *ep = (struct dma_edesc *)head;

for (i = 0; i < size; i++) {
dma_addr = dma_rx_phy + i * sizeof(*ep);
pr_info("%03d [%pad]: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
i, &dma_addr,
le32_to_cpu(ep->des4), le32_to_cpu(ep->des5),
le32_to_cpu(ep->des6), le32_to_cpu(ep->des7),
le32_to_cpu(ep->basic.des0), le32_to_cpu(ep->basic.des1),
le32_to_cpu(ep->basic.des2), le32_to_cpu(ep->basic.des3));
ep++;
}
} else {
pr_err("unsupported descriptor!");
}
}

Expand Down
9 changes: 6 additions & 3 deletions drivers/net/ethernet/stmicro/stmmac/enh_desc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -417,19 +417,22 @@ static int enh_desc_get_rx_timestamp_status(void *desc, void *next_desc,
}
}

static void enh_desc_display_ring(void *head, unsigned int size, bool rx)
static void enh_desc_display_ring(void *head, unsigned int size, bool rx,
dma_addr_t dma_rx_phy, unsigned int desc_size)
{
struct dma_extended_desc *ep = (struct dma_extended_desc *)head;
dma_addr_t dma_addr;
int i;

pr_info("Extended %s descriptor ring:\n", rx ? "RX" : "TX");

for (i = 0; i < size; i++) {
u64 x;
dma_addr = dma_rx_phy + i * sizeof(*ep);

x = *(u64 *)ep;
pr_info("%03d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
i, (unsigned int)virt_to_phys(ep),
pr_info("%03d [%pad]: 0x%x 0x%x 0x%x 0x%x\n",
i, &dma_addr,
(unsigned int)x, (unsigned int)(x >> 32),
ep->basic.des2, ep->basic.des3);
ep++;
Expand Down
3 changes: 2 additions & 1 deletion drivers/net/ethernet/stmicro/stmmac/hwif.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,8 @@ struct stmmac_desc_ops {
/* get rx timestamp status */
int (*get_rx_timestamp_status)(void *desc, void *next_desc, u32 ats);
/* Display ring */
void (*display_ring)(void *head, unsigned int size, bool rx);
void (*display_ring)(void *head, unsigned int size, bool rx,
dma_addr_t dma_rx_phy, unsigned int desc_size);
/* set MSS via context descriptor */
void (*set_mss)(struct dma_desc *p, unsigned int mss);
/* get descriptor skbuff address */
Expand Down
9 changes: 6 additions & 3 deletions drivers/net/ethernet/stmicro/stmmac/norm_desc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -269,19 +269,22 @@ static int ndesc_get_rx_timestamp_status(void *desc, void *next_desc, u32 ats)
return 1;
}

static void ndesc_display_ring(void *head, unsigned int size, bool rx)
static void ndesc_display_ring(void *head, unsigned int size, bool rx,
dma_addr_t dma_rx_phy, unsigned int desc_size)
{
struct dma_desc *p = (struct dma_desc *)head;
dma_addr_t dma_addr;
int i;

pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");

for (i = 0; i < size; i++) {
u64 x;
dma_addr = dma_rx_phy + i * sizeof(*p);

x = *(u64 *)p;
pr_info("%03d [0x%x]: 0x%x 0x%x 0x%x 0x%x",
i, (unsigned int)virt_to_phys(p),
pr_info("%03d [%pad]: 0x%x 0x%x 0x%x 0x%x",
i, &dma_addr,
(unsigned int)x, (unsigned int)(x >> 32),
p->des2, p->des3);
p++;
Expand Down
57 changes: 38 additions & 19 deletions drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1133,6 +1133,7 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
static void stmmac_display_rx_rings(struct stmmac_priv *priv)
{
u32 rx_cnt = priv->plat->rx_queues_to_use;
unsigned int desc_size;
void *head_rx;
u32 queue;

Expand All @@ -1142,19 +1143,24 @@ static void stmmac_display_rx_rings(struct stmmac_priv *priv)

pr_info("\tRX Queue %u rings\n", queue);

if (priv->extend_desc)
if (priv->extend_desc) {
head_rx = (void *)rx_q->dma_erx;
else
desc_size = sizeof(struct dma_extended_desc);
} else {
head_rx = (void *)rx_q->dma_rx;
desc_size = sizeof(struct dma_desc);
}

/* Display RX ring */
stmmac_display_ring(priv, head_rx, priv->dma_rx_size, true);
stmmac_display_ring(priv, head_rx, priv->dma_rx_size, true,
rx_q->dma_rx_phy, desc_size);
}
}

static void stmmac_display_tx_rings(struct stmmac_priv *priv)
{
u32 tx_cnt = priv->plat->tx_queues_to_use;
unsigned int desc_size;
void *head_tx;
u32 queue;

Expand All @@ -1164,14 +1170,19 @@ static void stmmac_display_tx_rings(struct stmmac_priv *priv)

pr_info("\tTX Queue %d rings\n", queue);

if (priv->extend_desc)
if (priv->extend_desc) {
head_tx = (void *)tx_q->dma_etx;
else if (tx_q->tbs & STMMAC_TBS_AVAIL)
desc_size = sizeof(struct dma_extended_desc);
} else if (tx_q->tbs & STMMAC_TBS_AVAIL) {
head_tx = (void *)tx_q->dma_entx;
else
desc_size = sizeof(struct dma_edesc);
} else {
head_tx = (void *)tx_q->dma_tx;
desc_size = sizeof(struct dma_desc);
}

stmmac_display_ring(priv, head_tx, priv->dma_tx_size, false);
stmmac_display_ring(priv, head_tx, priv->dma_tx_size, false,
tx_q->dma_tx_phy, desc_size);
}
}

Expand Down Expand Up @@ -3740,18 +3751,23 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
unsigned int count = 0, error = 0, len = 0;
int status = 0, coe = priv->hw->rx_csum;
unsigned int next_entry = rx_q->cur_rx;
unsigned int desc_size;
struct sk_buff *skb = NULL;

if (netif_msg_rx_status(priv)) {
void *rx_head;

netdev_dbg(priv->dev, "%s: descriptor ring:\n", __func__);
if (priv->extend_desc)
if (priv->extend_desc) {
rx_head = (void *)rx_q->dma_erx;
else
desc_size = sizeof(struct dma_extended_desc);
} else {
rx_head = (void *)rx_q->dma_rx;
desc_size = sizeof(struct dma_desc);
}

stmmac_display_ring(priv, rx_head, priv->dma_rx_size, true);
stmmac_display_ring(priv, rx_head, priv->dma_rx_size, true,
rx_q->dma_rx_phy, desc_size);
}
while (count < limit) {
unsigned int buf1_len = 0, buf2_len = 0;
Expand Down Expand Up @@ -4319,24 +4335,27 @@ static int stmmac_set_mac_address(struct net_device *ndev, void *addr)
static struct dentry *stmmac_fs_dir;

static void sysfs_display_ring(void *head, int size, int extend_desc,
struct seq_file *seq)
struct seq_file *seq, dma_addr_t dma_phy_addr)
{
int i;
struct dma_extended_desc *ep = (struct dma_extended_desc *)head;
struct dma_desc *p = (struct dma_desc *)head;
dma_addr_t dma_addr;

for (i = 0; i < size; i++) {
if (extend_desc) {
seq_printf(seq, "%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
i, (unsigned int)virt_to_phys(ep),
dma_addr = dma_phy_addr + i * sizeof(*ep);
seq_printf(seq, "%d [%pad]: 0x%x 0x%x 0x%x 0x%x\n",
i, &dma_addr,
le32_to_cpu(ep->basic.des0),
le32_to_cpu(ep->basic.des1),
le32_to_cpu(ep->basic.des2),
le32_to_cpu(ep->basic.des3));
ep++;
} else {
seq_printf(seq, "%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
i, (unsigned int)virt_to_phys(p),
dma_addr = dma_phy_addr + i * sizeof(*p);
seq_printf(seq, "%d [%pad]: 0x%x 0x%x 0x%x 0x%x\n",
i, &dma_addr,
le32_to_cpu(p->des0), le32_to_cpu(p->des1),
le32_to_cpu(p->des2), le32_to_cpu(p->des3));
p++;
Expand Down Expand Up @@ -4364,11 +4383,11 @@ static int stmmac_rings_status_show(struct seq_file *seq, void *v)
if (priv->extend_desc) {
seq_printf(seq, "Extended descriptor ring:\n");
sysfs_display_ring((void *)rx_q->dma_erx,
priv->dma_rx_size, 1, seq);
priv->dma_rx_size, 1, seq, rx_q->dma_rx_phy);
} else {
seq_printf(seq, "Descriptor ring:\n");
sysfs_display_ring((void *)rx_q->dma_rx,
priv->dma_rx_size, 0, seq);
priv->dma_rx_size, 0, seq, rx_q->dma_rx_phy);
}
}

Expand All @@ -4380,11 +4399,11 @@ static int stmmac_rings_status_show(struct seq_file *seq, void *v)
if (priv->extend_desc) {
seq_printf(seq, "Extended descriptor ring:\n");
sysfs_display_ring((void *)tx_q->dma_etx,
priv->dma_tx_size, 1, seq);
priv->dma_tx_size, 1, seq, tx_q->dma_tx_phy);
} else if (!(tx_q->tbs & STMMAC_TBS_AVAIL)) {
seq_printf(seq, "Descriptor ring:\n");
sysfs_display_ring((void *)tx_q->dma_tx,
priv->dma_tx_size, 0, seq);
priv->dma_tx_size, 0, seq, tx_q->dma_tx_phy);
}
}

Expand Down

0 comments on commit 61f976d

Please sign in to comment.