[PATCH net-next 00/15] net: stmmac: clean up descriptor handling part 1

[PATCH net-next 00/15] net: stmmac: clean up descriptor handling part 1

[Russell King (Oracle)]

Hi,

Part 1 of cleaning up the stmmac descriptor handling. Rearrange the
struct stmmac_tx_info to pack better, and introduce helpers for
duplicated code handing the transmit and receive descriptors. Remove
unnecessary struct members that are only transitorily used.

 drivers/net/ethernet/stmicro/stmmac/stmmac.h      |   8 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 458 +++++++++-------------
 2 files changed, 194 insertions(+), 272 deletions(-)

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

[PATCH net-next 01/15] net: stmmac: rearrange stmmac_tx_info members to pack better

[Russell King (Oracle)]

Rearrange the struct stmmac_tx_info members to pack better, essentially
by sorting by type size:

xsk_meta	embeds only a pointer - 32 or 64 bit
buf		dma address, 32 or 64 bit
len		normally 32 bit
buf_type	dependent on arch
map_as_page	normally 8 bit
last_segment	normally 8 bit
is_jumbo	normally 8 bit

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index bba9bb9c95bf..b096a9e090e3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -47,13 +47,13 @@ enum stmmac_txbuf_type {
 };
 
 struct stmmac_tx_info {
+	struct xsk_tx_metadata_compl xsk_meta;
 	dma_addr_t buf;
-	bool map_as_page;
 	unsigned len;
+	enum stmmac_txbuf_type buf_type;
+	bool map_as_page;
 	bool last_segment;
 	bool is_jumbo;
-	enum stmmac_txbuf_type buf_type;
-	struct xsk_tx_metadata_compl xsk_meta;
 };
 
 #define STMMAC_TBS_AVAIL	BIT(0)
-- 
2.47.3

[PATCH net-next 02/15] net: stmmac: helpers for filling tx_q->tx_skbuff_dma

[Russell King (Oracle)]

Add helpers to fill in the transmit queue metadata to ensure that all
entries are initialised when preparing to transmit. This avoids clean
up code running into surprises.

For example, stmmac_clean_desc3() (which calls clean_desc3() in
chain_mode.c or ring_mode.c) looks at the .last_segment, and in the
latter case, .is_jumbo members.

stmmac_tso_xmit() was also a problem. If the metadata is not fully
cleared when cleaning dirty entries (or, in the case of resume,
freeing all entries) then .last_segment may be left set, which then
causes:

        stmmac_prepare_tso_tx_desc(priv, first, 1, proto_hdr_len, 0, 1,
                                   tx_q->tx_skbuff_dma[first_entry].last_segment+,
                                   hdr / 4, (skb->len - proto_hdr_len));

to mark the

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 96 +++++++++++--------
 1 file changed, 54 insertions(+), 42 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 11150bddd872..0dcf4a31e314 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1925,6 +1925,34 @@ static int init_dma_rx_desc_rings(struct net_device *dev,
 	return ret;
 }
 
+static void stmmac_set_tx_dma_entry(struct stmmac_tx_queue *tx_q,
+				    unsigned int entry,
+				    enum stmmac_txbuf_type type,
+				    dma_addr_t addr, size_t len,
+				    bool map_as_page)
+{
+	tx_q->tx_skbuff_dma[entry].buf = addr;
+	tx_q->tx_skbuff_dma[entry].len = len;
+	tx_q->tx_skbuff_dma[entry].buf_type = type;
+	tx_q->tx_skbuff_dma[entry].map_as_page = map_as_page;
+	tx_q->tx_skbuff_dma[entry].last_segment = false;
+	tx_q->tx_skbuff_dma[entry].is_jumbo = false;
+}
+
+static void stmmac_set_tx_skb_dma_entry(struct stmmac_tx_queue *tx_q,
+					unsigned int entry, dma_addr_t addr,
+					size_t len, bool map_as_page)
+{
+	stmmac_set_tx_dma_entry(tx_q, entry, STMMAC_TXBUF_T_SKB, addr, len,
+				map_as_page);
+}
+
+static void stmmac_set_tx_dma_last_segment(struct stmmac_tx_queue *tx_q,
+					   unsigned int entry)
+{
+	tx_q->tx_skbuff_dma[entry].last_segment = true;
+}
+
 /**
  * __init_dma_tx_desc_rings - init the TX descriptor ring (per queue)
  * @priv: driver private structure
@@ -1970,11 +1998,8 @@ static int __init_dma_tx_desc_rings(struct stmmac_priv *priv,
 			p = tx_q->dma_tx + i;
 
 		stmmac_clear_desc(priv, p);
+		stmmac_set_tx_skb_dma_entry(tx_q, i, 0, 0, false);
 
-		tx_q->tx_skbuff_dma[i].buf = 0;
-		tx_q->tx_skbuff_dma[i].map_as_page = false;
-		tx_q->tx_skbuff_dma[i].len = 0;
-		tx_q->tx_skbuff_dma[i].last_segment = false;
 		tx_q->tx_skbuff[i] = NULL;
 	}
 
@@ -2695,19 +2720,15 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
 		meta = xsk_buff_get_metadata(pool, xdp_desc.addr);
 		xsk_buff_raw_dma_sync_for_device(pool, dma_addr, xdp_desc.len);
 
-		tx_q->tx_skbuff_dma[entry].buf_type = STMMAC_TXBUF_T_XSK_TX;
-
 		/* To return XDP buffer to XSK pool, we simple call
 		 * xsk_tx_completed(), so we don't need to fill up
 		 * 'buf' and 'xdpf'.
 		 */
-		tx_q->tx_skbuff_dma[entry].buf = 0;
-		tx_q->xdpf[entry] = NULL;
+		stmmac_set_tx_dma_entry(tx_q, entry, STMMAC_TXBUF_T_XSK_TX,
+					0, xdp_desc.len, false);
+		stmmac_set_tx_dma_last_segment(tx_q, entry);
 
-		tx_q->tx_skbuff_dma[entry].map_as_page = false;
-		tx_q->tx_skbuff_dma[entry].len = xdp_desc.len;
-		tx_q->tx_skbuff_dma[entry].last_segment = true;
-		tx_q->tx_skbuff_dma[entry].is_jumbo = false;
+		tx_q->xdpf[entry] = NULL;
 
 		stmmac_set_desc_addr(priv, tx_desc, dma_addr);
 
@@ -2882,6 +2903,9 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue,
 			tx_q->tx_skbuff_dma[entry].map_as_page = false;
 		}
 
+		/* This looks at tx_q->tx_skbuff_dma[tx_q->dirty_tx].is_jumbo
+		 * and tx_q->tx_skbuff_dma[tx_q->dirty_tx].last_segment
+		 */
 		stmmac_clean_desc3(priv, tx_q, p);
 
 		tx_q->tx_skbuff_dma[entry].last_segment = false;
@@ -4471,10 +4495,8 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 	 * this DMA buffer right after the DMA engine completely finishes the
 	 * full buffer transmission.
 	 */
-	tx_q->tx_skbuff_dma[tx_q->cur_tx].buf = des;
-	tx_q->tx_skbuff_dma[tx_q->cur_tx].len = skb_headlen(skb);
-	tx_q->tx_skbuff_dma[tx_q->cur_tx].map_as_page = false;
-	tx_q->tx_skbuff_dma[tx_q->cur_tx].buf_type = STMMAC_TXBUF_T_SKB;
+	stmmac_set_tx_skb_dma_entry(tx_q, tx_q->cur_tx, des, skb_headlen(skb),
+				    false);
 
 	/* Prepare fragments */
 	for (i = 0; i < nfrags; i++) {
@@ -4489,17 +4511,14 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 		stmmac_tso_allocator(priv, des, skb_frag_size(frag),
 				     (i == nfrags - 1), queue);
 
-		tx_q->tx_skbuff_dma[tx_q->cur_tx].buf = des;
-		tx_q->tx_skbuff_dma[tx_q->cur_tx].len = skb_frag_size(frag);
-		tx_q->tx_skbuff_dma[tx_q->cur_tx].map_as_page = true;
-		tx_q->tx_skbuff_dma[tx_q->cur_tx].buf_type = STMMAC_TXBUF_T_SKB;
+		stmmac_set_tx_skb_dma_entry(tx_q, tx_q->cur_tx, des,
+					    skb_frag_size(frag), true);
 	}
 
-	tx_q->tx_skbuff_dma[tx_q->cur_tx].last_segment = true;
+	stmmac_set_tx_dma_last_segment(tx_q, tx_q->cur_tx);
 
 	/* Only the last descriptor gets to point to the skb. */
 	tx_q->tx_skbuff[tx_q->cur_tx] = skb;
-	tx_q->tx_skbuff_dma[tx_q->cur_tx].buf_type = STMMAC_TXBUF_T_SKB;
 
 	/* Manage tx mitigation */
 	tx_packets = CIRC_CNT(tx_q->cur_tx + 1, first_tx,
@@ -4758,23 +4777,18 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 		if (dma_mapping_error(priv->device, des))
 			goto dma_map_err; /* should reuse desc w/o issues */
 
-		tx_q->tx_skbuff_dma[entry].buf = des;
-
+		stmmac_set_tx_skb_dma_entry(tx_q, entry, des, len, true);
 		stmmac_set_desc_addr(priv, desc, des);
 
-		tx_q->tx_skbuff_dma[entry].map_as_page = true;
-		tx_q->tx_skbuff_dma[entry].len = len;
-		tx_q->tx_skbuff_dma[entry].last_segment = last_segment;
-		tx_q->tx_skbuff_dma[entry].buf_type = STMMAC_TXBUF_T_SKB;
-
 		/* Prepare the descriptor and set the own bit too */
 		stmmac_prepare_tx_desc(priv, desc, 0, len, csum_insertion,
 				priv->mode, 1, last_segment, skb->len);
 	}
 
+	stmmac_set_tx_dma_last_segment(tx_q, entry);
+
 	/* Only the last descriptor gets to point to the skb. */
 	tx_q->tx_skbuff[entry] = skb;
-	tx_q->tx_skbuff_dma[entry].buf_type = STMMAC_TXBUF_T_SKB;
 
 	/* According to the coalesce parameter the IC bit for the latest
 	 * segment is reset and the timer re-started to clean the tx status.
@@ -4853,14 +4867,13 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 		if (dma_mapping_error(priv->device, des))
 			goto dma_map_err;
 
-		tx_q->tx_skbuff_dma[first_entry].buf = des;
-		tx_q->tx_skbuff_dma[first_entry].buf_type = STMMAC_TXBUF_T_SKB;
-		tx_q->tx_skbuff_dma[first_entry].map_as_page = false;
+		stmmac_set_tx_skb_dma_entry(tx_q, first_entry, des, nopaged_len,
+					    false);
 
 		stmmac_set_desc_addr(priv, first, des);
 
-		tx_q->tx_skbuff_dma[first_entry].len = nopaged_len;
-		tx_q->tx_skbuff_dma[first_entry].last_segment = last_segment;
+		if (last_segment)
+			stmmac_set_tx_dma_last_segment(tx_q, first_entry);
 
 		if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
 			     priv->hwts_tx_en)) {
@@ -5062,6 +5075,7 @@ static int stmmac_xdp_xmit_xdpf(struct stmmac_priv *priv, int queue,
 	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
 	bool csum = !priv->plat->tx_queues_cfg[queue].coe_unsupported;
 	unsigned int entry = tx_q->cur_tx;
+	enum stmmac_txbuf_type buf_type;
 	struct dma_desc *tx_desc;
 	dma_addr_t dma_addr;
 	bool set_ic;
@@ -5089,7 +5103,7 @@ static int stmmac_xdp_xmit_xdpf(struct stmmac_priv *priv, int queue,
 		if (dma_mapping_error(priv->device, dma_addr))
 			return STMMAC_XDP_CONSUMED;
 
-		tx_q->tx_skbuff_dma[entry].buf_type = STMMAC_TXBUF_T_XDP_NDO;
+		buf_type = STMMAC_TXBUF_T_XDP_NDO;
 	} else {
 		struct page *page = virt_to_page(xdpf->data);
 
@@ -5098,14 +5112,12 @@ static int stmmac_xdp_xmit_xdpf(struct stmmac_priv *priv, int queue,
 		dma_sync_single_for_device(priv->device, dma_addr,
 					   xdpf->len, DMA_BIDIRECTIONAL);
 
-		tx_q->tx_skbuff_dma[entry].buf_type = STMMAC_TXBUF_T_XDP_TX;
+		buf_type = STMMAC_TXBUF_T_XDP_TX;
 	}
 
-	tx_q->tx_skbuff_dma[entry].buf = dma_addr;
-	tx_q->tx_skbuff_dma[entry].map_as_page = false;
-	tx_q->tx_skbuff_dma[entry].len = xdpf->len;
-	tx_q->tx_skbuff_dma[entry].last_segment = true;
-	tx_q->tx_skbuff_dma[entry].is_jumbo = false;
+	stmmac_set_tx_dma_entry(tx_q, entry, buf_type, dma_addr, xdpf->len,
+				false);
+	stmmac_set_tx_dma_last_segment(tx_q, entry);
 
 	tx_q->xdpf[entry] = xdpf;
 
-- 
2.47.3

Re: [PATCH net-next 02/15] net: stmmac: helpers for filling tx_q->tx_skbuff_dma

[Andrew Lunn]

On Wed, Mar 11, 2026 at 09:52:14AM +0000, Russell King (Oracle) wrote:
> Add helpers to fill in the transmit queue metadata to ensure that all
> entries are initialised when preparing to transmit. This avoids clean
> up code running into surprises.
> 
> For example, stmmac_clean_desc3() (which calls clean_desc3() in
> chain_mode.c or ring_mode.c) looks at the .last_segment, and in the
> latter case, .is_jumbo members.
> 
> stmmac_tso_xmit() was also a problem. If the metadata is not fully
> cleared when cleaning dirty entries (or, in the case of resume,
> freeing all entries) then .last_segment may be left set, which then
> causes:
> 
>         stmmac_prepare_tso_tx_desc(priv, first, 1, proto_hdr_len, 0, 1,
>                                    tx_q->tx_skbuff_dma[first_entry].last_segment+,
>                                    hdr / 4, (skb->len - proto_hdr_len));
> 
> to mark the

That sentence appear to be unfinished.

	Andrew

Re: [PATCH net-next 02/15] net: stmmac: helpers for filling tx_q->tx_skbuff_dma

[Russell King (Oracle)]

On Wed, Mar 11, 2026 at 03:57:13PM +0100, Andrew Lunn wrote:
> On Wed, Mar 11, 2026 at 09:52:14AM +0000, Russell King (Oracle) wrote:
> > Add helpers to fill in the transmit queue metadata to ensure that all
> > entries are initialised when preparing to transmit. This avoids clean
> > up code running into surprises.
> > 
> > For example, stmmac_clean_desc3() (which calls clean_desc3() in
> > chain_mode.c or ring_mode.c) looks at the .last_segment, and in the
> > latter case, .is_jumbo members.
> > 
> > stmmac_tso_xmit() was also a problem. If the metadata is not fully
> > cleared when cleaning dirty entries (or, in the case of resume,
> > freeing all entries) then .last_segment may be left set, which then
> > causes:
> > 
> >         stmmac_prepare_tso_tx_desc(priv, first, 1, proto_hdr_len, 0, 1,
> >                                    tx_q->tx_skbuff_dma[first_entry].last_segment+,
> >                                    hdr / 4, (skb->len - proto_hdr_len));
> > 
> > to mark the
> 
> That sentence appear to be unfinished.

Hmm, it's also not relevant anymore because we fixed that problem in a
different way.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

Re: [PATCH net-next 02/15] net: stmmac: helpers for filling tx_q->tx_skbuff_dma

[Russell King (Oracle)]

On Wed, Mar 11, 2026 at 09:52:14AM +0000, Russell King (Oracle) wrote:
> +static void stmmac_set_tx_dma_entry(struct stmmac_tx_queue *tx_q,
> +				    unsigned int entry,
> +				    enum stmmac_txbuf_type type,
> +				    dma_addr_t addr, size_t len,
> +				    bool map_as_page)
> +{
...
> +	tx_q->tx_skbuff_dma[entry].buf_type = type;
...
> +}
> +
> +static void stmmac_set_tx_skb_dma_entry(struct stmmac_tx_queue *tx_q,
> +					unsigned int entry, dma_addr_t addr,
> +					size_t len, bool map_as_page)
> +{
> +	stmmac_set_tx_dma_entry(tx_q, entry, STMMAC_TXBUF_T_SKB, addr, len,
> +				map_as_page);
> +}

...

> @@ -4471,10 +4495,8 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
>  	 * this DMA buffer right after the DMA engine completely finishes the
>  	 * full buffer transmission.
>  	 */
> -	tx_q->tx_skbuff_dma[tx_q->cur_tx].buf = des;
> -	tx_q->tx_skbuff_dma[tx_q->cur_tx].len = skb_headlen(skb);
> -	tx_q->tx_skbuff_dma[tx_q->cur_tx].map_as_page = false;
> -	tx_q->tx_skbuff_dma[tx_q->cur_tx].buf_type = STMMAC_TXBUF_T_SKB;
> +	stmmac_set_tx_skb_dma_entry(tx_q, tx_q->cur_tx, des, skb_headlen(skb),
> +				    false);

when nfrags is zero, tx_q->tx_skbuff_dma[tx_q->cur_tx].buf_type is set
here.

>  
>  	/* Prepare fragments */
>  	for (i = 0; i < nfrags; i++) {
> @@ -4489,17 +4511,14 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
>  		stmmac_tso_allocator(priv, des, skb_frag_size(frag),
>  				     (i == nfrags - 1), queue);
>  
> -		tx_q->tx_skbuff_dma[tx_q->cur_tx].buf = des;
> -		tx_q->tx_skbuff_dma[tx_q->cur_tx].len = skb_frag_size(frag);
> -		tx_q->tx_skbuff_dma[tx_q->cur_tx].map_as_page = true;
> -		tx_q->tx_skbuff_dma[tx_q->cur_tx].buf_type = STMMAC_TXBUF_T_SKB;
> +		stmmac_set_tx_skb_dma_entry(tx_q, tx_q->cur_tx, des,
> +					    skb_frag_size(frag), true);
>  	}

... and tx_q->cur_tx is not incremented because the loop is not
executed.

>  
> -	tx_q->tx_skbuff_dma[tx_q->cur_tx].last_segment = true;
> +	stmmac_set_tx_dma_last_segment(tx_q, tx_q->cur_tx);
>  
>  	/* Only the last descriptor gets to point to the skb. */
>  	tx_q->tx_skbuff[tx_q->cur_tx] = skb;
> -	tx_q->tx_skbuff_dma[tx_q->cur_tx].buf_type = STMMAC_TXBUF_T_SKB;

Thus this assignment of tx_q->tx_skbuff_dma[tx_q->cur_tx].buf_type is
redundant. As the loop doesn't execute any code in the nfrags=0 case,
there is no call to stmmac_tso_allocator(), and thus tx_q->cur_tx will
be the same as when the previous stmmac_set_tx_skb_dma_entry() was
called.

Therefore, the AI review is incorrect.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

[PATCH net-next 03/15] net: stmmac: clean up stmmac_clear_rx_descriptors()

[Russell King (Oracle)]

The two paths calling stmmac_init_rx_desc() are identical apart from
the way the pointer to the descriptor is fetched. Split this out.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c  | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 0dcf4a31e314..765b168df50d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1514,20 +1514,20 @@ static void stmmac_clear_rx_descriptors(struct stmmac_priv *priv,
 					u32 queue)
 {
 	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];
+	struct dma_desc *desc;
 	int i;
 
 	/* Clear the RX descriptors */
-	for (i = 0; i < dma_conf->dma_rx_size; i++)
+	for (i = 0; i < dma_conf->dma_rx_size; i++) {
 		if (priv->extend_desc)
-			stmmac_init_rx_desc(priv, &rx_q->dma_erx[i].basic,
-					priv->use_riwt, priv->mode,
-					(i == dma_conf->dma_rx_size - 1),
-					dma_conf->dma_buf_sz);
+			desc = &rx_q->dma_erx[i].basic;
 		else
-			stmmac_init_rx_desc(priv, &rx_q->dma_rx[i],
-					priv->use_riwt, priv->mode,
-					(i == dma_conf->dma_rx_size - 1),
-					dma_conf->dma_buf_sz);
+			desc = &rx_q->dma_rx[i];
+
+		stmmac_init_rx_desc(priv, desc, priv->use_riwt, priv->mode,
+				    (i == dma_conf->dma_rx_size - 1),
+				    dma_conf->dma_buf_sz);
+	}
 }
 
 /**
-- 
2.47.3

[PATCH net-next 04/15] net: stmmac: add helper to get hardware receive descriptor

[Russell King (Oracle)]

Provide a helper to get a hardware receive descriptor that takes
account of whether extended format is being used, but returning the
base struct dma_desc pointer. This avoids multiple instances where
this is open coded.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 76 +++++++------------
 1 file changed, 26 insertions(+), 50 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 765b168df50d..a3dfd3501604 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -362,6 +362,16 @@ static inline u32 stmmac_tx_avail(struct stmmac_priv *priv, u32 queue)
 			  priv->dma_conf.dma_tx_size);
 }
 
+static struct dma_desc *stmmac_get_rx_desc(struct stmmac_priv *priv,
+					   struct stmmac_rx_queue *rx_q,
+					   unsigned int index)
+{
+	if (priv->extend_desc)
+		return &rx_q->dma_erx[index].basic;
+	else
+		return &rx_q->dma_rx[index];
+}
+
 /**
  * stmmac_rx_dirty - Get RX queue dirty
  * @priv: driver private structure
@@ -1421,13 +1431,11 @@ static void stmmac_display_rx_rings(struct stmmac_priv *priv,
 
 		pr_info("\tRX Queue %u rings\n", queue);
 
-		if (priv->extend_desc) {
-			head_rx = (void *)rx_q->dma_erx;
+		head_rx = stmmac_get_rx_desc(priv, rx_q, 0);
+		if (priv->extend_desc)
 			desc_size = sizeof(struct dma_extended_desc);
-		} else {
-			head_rx = (void *)rx_q->dma_rx;
+		else
 			desc_size = sizeof(struct dma_desc);
-		}
 
 		/* Display RX ring */
 		stmmac_display_ring(priv, head_rx, dma_conf->dma_rx_size, true,
@@ -1519,10 +1527,7 @@ static void stmmac_clear_rx_descriptors(struct stmmac_priv *priv,
 
 	/* Clear the RX descriptors */
 	for (i = 0; i < dma_conf->dma_rx_size; i++) {
-		if (priv->extend_desc)
-			desc = &rx_q->dma_erx[i].basic;
-		else
-			desc = &rx_q->dma_rx[i];
+		desc = stmmac_get_rx_desc(priv, rx_q, i);
 
 		stmmac_init_rx_desc(priv, desc, priv->use_riwt, priv->mode,
 				    (i == dma_conf->dma_rx_size - 1),
@@ -1731,10 +1736,7 @@ static int stmmac_alloc_rx_buffers(struct stmmac_priv *priv,
 		struct dma_desc *p;
 		int ret;
 
-		if (priv->extend_desc)
-			p = &((rx_q->dma_erx + i)->basic);
-		else
-			p = rx_q->dma_rx + i;
+		p = stmmac_get_rx_desc(priv, rx_q, i);
 
 		ret = stmmac_init_rx_buffers(priv, dma_conf, p, i, flags,
 					     queue);
@@ -1789,10 +1791,7 @@ static int stmmac_alloc_rx_buffers_zc(struct stmmac_priv *priv,
 		dma_addr_t dma_addr;
 		struct dma_desc *p;
 
-		if (priv->extend_desc)
-			p = (struct dma_desc *)(rx_q->dma_erx + i);
-		else
-			p = rx_q->dma_rx + i;
+		p = stmmac_get_rx_desc(priv, rx_q, i);
 
 		buf = &rx_q->buf_pool[i];
 
@@ -4954,10 +4953,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
 		struct dma_desc *p;
 		bool use_rx_wd;
 
-		if (priv->extend_desc)
-			p = (struct dma_desc *)(rx_q->dma_erx + entry);
-		else
-			p = rx_q->dma_rx + entry;
+		p = stmmac_get_rx_desc(priv, rx_q, entry);
 
 		if (!buf->page) {
 			buf->page = page_pool_alloc_pages(rx_q->page_pool, gfp);
@@ -5355,10 +5351,7 @@ static bool stmmac_rx_refill_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
 			}
 		}
 
-		if (priv->extend_desc)
-			rx_desc = (struct dma_desc *)(rx_q->dma_erx + entry);
-		else
-			rx_desc = rx_q->dma_rx + entry;
+		rx_desc = stmmac_get_rx_desc(priv, rx_q, entry);
 
 		dma_addr = xsk_buff_xdp_get_dma(buf->xdp);
 		stmmac_set_desc_addr(priv, rx_desc, dma_addr);
@@ -5416,14 +5409,12 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue)
 	int status = 0;
 
 	if (netif_msg_rx_status(priv)) {
-		void *rx_head;
+		void *rx_head = stmmac_get_rx_desc(priv, rx_q, 0);
 
 		netdev_dbg(priv->dev, "%s: descriptor ring:\n", __func__);
 		if (priv->extend_desc) {
-			rx_head = (void *)rx_q->dma_erx;
 			desc_size = sizeof(struct dma_extended_desc);
 		} else {
-			rx_head = (void *)rx_q->dma_rx;
 			desc_size = sizeof(struct dma_desc);
 		}
 
@@ -5461,10 +5452,7 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue)
 			dirty = 0;
 		}
 
-		if (priv->extend_desc)
-			p = (struct dma_desc *)(rx_q->dma_erx + entry);
-		else
-			p = rx_q->dma_rx + entry;
+		p = stmmac_get_rx_desc(priv, rx_q, entry);
 
 		/* read the status of the incoming frame */
 		status = stmmac_rx_status(priv, &priv->xstats, p);
@@ -5477,10 +5465,7 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue)
 						priv->dma_conf.dma_rx_size);
 		next_entry = rx_q->cur_rx;
 
-		if (priv->extend_desc)
-			np = (struct dma_desc *)(rx_q->dma_erx + next_entry);
-		else
-			np = rx_q->dma_rx + next_entry;
+		np = stmmac_get_rx_desc(priv, rx_q, next_entry);
 
 		prefetch(np);
 
@@ -5616,16 +5601,13 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 	limit = min(priv->dma_conf.dma_rx_size - 1, (unsigned int)limit);
 
 	if (netif_msg_rx_status(priv)) {
-		void *rx_head;
+		void *rx_head = stmmac_get_rx_desc(priv, rx_q, 0);
 
 		netdev_dbg(priv->dev, "%s: descriptor ring:\n", __func__);
-		if (priv->extend_desc) {
-			rx_head = (void *)rx_q->dma_erx;
+		if (priv->extend_desc)
 			desc_size = sizeof(struct dma_extended_desc);
-		} else {
-			rx_head = (void *)rx_q->dma_rx;
+		else
 			desc_size = sizeof(struct dma_desc);
-		}
 
 		stmmac_display_ring(priv, rx_head, priv->dma_conf.dma_rx_size, true,
 				    rx_q->dma_rx_phy, desc_size);
@@ -5658,10 +5640,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 		entry = next_entry;
 		buf = &rx_q->buf_pool[entry];
 
-		if (priv->extend_desc)
-			p = (struct dma_desc *)(rx_q->dma_erx + entry);
-		else
-			p = rx_q->dma_rx + entry;
+		p = stmmac_get_rx_desc(priv, rx_q, entry);
 
 		/* read the status of the incoming frame */
 		status = stmmac_rx_status(priv, &priv->xstats, p);
@@ -5673,10 +5652,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 						priv->dma_conf.dma_rx_size);
 		next_entry = rx_q->cur_rx;
 
-		if (priv->extend_desc)
-			np = (struct dma_desc *)(rx_q->dma_erx + next_entry);
-		else
-			np = rx_q->dma_rx + next_entry;
+		np = stmmac_get_rx_desc(priv, rx_q, next_entry);
 
 		prefetch(np);
 
-- 
2.47.3

[PATCH net-next 05/15] net: stmmac: add helper to get size of a receive descriptor

[Russell King (Oracle)]

Add and use a helper to get the size of the hardware receive
descriptor.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 24 +++++++++----------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index a3dfd3501604..dca62e7b259a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -362,6 +362,14 @@ static inline u32 stmmac_tx_avail(struct stmmac_priv *priv, u32 queue)
 			  priv->dma_conf.dma_tx_size);
 }
 
+static size_t stmmac_get_rx_desc_size(struct stmmac_priv *priv)
+{
+	if (priv->extend_desc)
+		return sizeof(struct dma_extended_desc);
+	else
+		return sizeof(struct dma_desc);
+}
+
 static struct dma_desc *stmmac_get_rx_desc(struct stmmac_priv *priv,
 					   struct stmmac_rx_queue *rx_q,
 					   unsigned int index)
@@ -1432,10 +1440,7 @@ static void stmmac_display_rx_rings(struct stmmac_priv *priv,
 		pr_info("\tRX Queue %u rings\n", queue);
 
 		head_rx = stmmac_get_rx_desc(priv, rx_q, 0);
-		if (priv->extend_desc)
-			desc_size = sizeof(struct dma_extended_desc);
-		else
-			desc_size = sizeof(struct dma_desc);
+		desc_size = stmmac_get_rx_desc_size(priv);
 
 		/* Display RX ring */
 		stmmac_display_ring(priv, head_rx, dma_conf->dma_rx_size, true,
@@ -5412,11 +5417,7 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue)
 		void *rx_head = stmmac_get_rx_desc(priv, rx_q, 0);
 
 		netdev_dbg(priv->dev, "%s: descriptor ring:\n", __func__);
-		if (priv->extend_desc) {
-			desc_size = sizeof(struct dma_extended_desc);
-		} else {
-			desc_size = sizeof(struct dma_desc);
-		}
+		desc_size = stmmac_get_rx_desc_size(priv);
 
 		stmmac_display_ring(priv, rx_head, priv->dma_conf.dma_rx_size, true,
 				    rx_q->dma_rx_phy, desc_size);
@@ -5604,10 +5605,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 		void *rx_head = stmmac_get_rx_desc(priv, rx_q, 0);
 
 		netdev_dbg(priv->dev, "%s: descriptor ring:\n", __func__);
-		if (priv->extend_desc)
-			desc_size = sizeof(struct dma_extended_desc);
-		else
-			desc_size = sizeof(struct dma_desc);
+		desc_size = stmmac_get_rx_desc_size(priv);
 
 		stmmac_display_ring(priv, rx_head, priv->dma_conf.dma_rx_size, true,
 				    rx_q->dma_rx_phy, desc_size);
-- 
2.47.3

[PATCH net-next 06/15] net: stmmac: add helper to set receive tail pointer

[Russell King (Oracle)]

Setting the queue receive tail pointer follows a common pattern:
calculate the DMA address, and then call stmmac_set_rx_tail_ptr().
The only difference between all the call sites is the index used.

Factor this out into a static function, and add a comment about why
it only uses the normal descriptor size.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 40 +++++++++----------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index dca62e7b259a..8823f8f5b053 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -380,6 +380,18 @@ static struct dma_desc *stmmac_get_rx_desc(struct stmmac_priv *priv,
 		return &rx_q->dma_rx[index];
 }
 
+static void stmmac_set_queue_rx_tail_ptr(struct stmmac_priv *priv,
+					 struct stmmac_rx_queue *rx_q,
+					 unsigned int chan, unsigned int index)
+{
+	/* This only needs to deal with normal descriptors as enhanced
+	 * descriptiors are only supported with dwmac1000 (<v4.0) which
+	 * does not implement .set_rx_tail_ptr
+	 */
+	rx_q->rx_tail_addr = rx_q->dma_rx_phy + index * sizeof(struct dma_desc);
+	stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_q->rx_tail_addr, chan);
+}
+
 /**
  * stmmac_rx_dirty - Get RX queue dirty
  * @priv: driver private structure
@@ -3302,11 +3314,8 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 		stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
 				    rx_q->dma_rx_phy, chan);
 
-		rx_q->rx_tail_addr = rx_q->dma_rx_phy +
-				     (rx_q->buf_alloc_num *
-				      sizeof(struct dma_desc));
-		stmmac_set_rx_tail_ptr(priv, priv->ioaddr,
-				       rx_q->rx_tail_addr, chan);
+		stmmac_set_queue_rx_tail_ptr(priv, rx_q, chan,
+					     rx_q->buf_alloc_num);
 	}
 
 	/* DMA TX Channel Configuration */
@@ -4999,9 +5008,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
 		entry = STMMAC_GET_ENTRY(entry, priv->dma_conf.dma_rx_size);
 	}
 	rx_q->dirty_rx = entry;
-	rx_q->rx_tail_addr = rx_q->dma_rx_phy +
-			    (rx_q->dirty_rx * sizeof(struct dma_desc));
-	stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_q->rx_tail_addr, queue);
+	stmmac_set_queue_rx_tail_ptr(priv, rx_q, queue, rx_q->dirty_rx);
 	/* Wake up Rx DMA from the suspend state if required */
 	stmmac_enable_dma_reception(priv, priv->ioaddr, queue);
 }
@@ -5381,9 +5388,7 @@ static bool stmmac_rx_refill_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
 
 	if (rx_desc) {
 		rx_q->dirty_rx = entry;
-		rx_q->rx_tail_addr = rx_q->dma_rx_phy +
-				     (rx_q->dirty_rx * sizeof(struct dma_desc));
-		stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_q->rx_tail_addr, queue);
+		stmmac_set_queue_rx_tail_ptr(priv, rx_q, queue, rx_q->dirty_rx);
 	}
 
 	return ret;
@@ -6951,10 +6956,8 @@ void stmmac_enable_rx_queue(struct stmmac_priv *priv, u32 queue)
 	stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
 			    rx_q->dma_rx_phy, rx_q->queue_index);
 
-	rx_q->rx_tail_addr = rx_q->dma_rx_phy + (rx_q->buf_alloc_num *
-			     sizeof(struct dma_desc));
-	stmmac_set_rx_tail_ptr(priv, priv->ioaddr,
-			       rx_q->rx_tail_addr, rx_q->queue_index);
+	stmmac_set_queue_rx_tail_ptr(priv, rx_q, rx_q->queue_index,
+				     rx_q->buf_alloc_num);
 
 	if (rx_q->xsk_pool && rx_q->buf_alloc_num) {
 		buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
@@ -7105,11 +7108,8 @@ int stmmac_xdp_open(struct net_device *dev)
 		stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
 				    rx_q->dma_rx_phy, chan);
 
-		rx_q->rx_tail_addr = rx_q->dma_rx_phy +
-				     (rx_q->buf_alloc_num *
-				      sizeof(struct dma_desc));
-		stmmac_set_rx_tail_ptr(priv, priv->ioaddr,
-				       rx_q->rx_tail_addr, chan);
+		stmmac_set_queue_rx_tail_ptr(priv, rx_q, chan,
+					     rx_q->buf_alloc_num);
 
 		if (rx_q->xsk_pool && rx_q->buf_alloc_num) {
 			buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
-- 
2.47.3

[PATCH net-next 07/15] net: stmmac: remove rx_tail_addr

[Russell King (Oracle)]

There is only one place where rx_q->rx_tail_addr is used - the new
stmmac_set_queue_rx_tail_ptr(). Make this a local variable and remove
it from struct stmmac_rx_queue.

This commit does not change the semantics - the hardware relies upon
the descriptor ring not crossing a 4GiB boundary as the high address
bits are programmed into a separate register via stmmac_init_rx_chan().
Hence, truncating the DMA address to 32-bit is fine as the register it
will be programmed into is 32-bit, and the high bits are handled
elsewhere.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h      | 1 -
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 +++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index b096a9e090e3..d1f8383d1c04 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -131,7 +131,6 @@ struct stmmac_rx_queue {
 	unsigned int buf_alloc_num;
 	unsigned int napi_skb_frag_size;
 	dma_addr_t dma_rx_phy;
-	u32 rx_tail_addr;
 	unsigned int state_saved;
 	struct {
 		struct sk_buff *skb;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8823f8f5b053..1d40168ec68d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -388,8 +388,9 @@ static void stmmac_set_queue_rx_tail_ptr(struct stmmac_priv *priv,
 	 * descriptiors are only supported with dwmac1000 (<v4.0) which
 	 * does not implement .set_rx_tail_ptr
 	 */
-	rx_q->rx_tail_addr = rx_q->dma_rx_phy + index * sizeof(struct dma_desc);
-	stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_q->rx_tail_addr, chan);
+	u32 rx_tail_addr = rx_q->dma_rx_phy + index * sizeof(struct dma_desc);
+
+	stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_tail_addr, chan);
 }
 
 /**
-- 
2.47.3

[PATCH net-next 08/15] net: stmmac: use consistent tests for receive buffer size

[Russell King (Oracle)]

Two out of the three sites that set the receive buffer size (via
stmmac_set_dma_bfsize()) check for rx_q->xsk_pool &&
rx_q->buf_alloc_num. One uses just rx_q->xsk_pool.

Discussing with Yoong Siang Song, the conclusion is that
stmmac_dma_operation_mode() is missing the rx_q->buf_alloc_num
check. Add this check.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 1d40168ec68d..787b02c2607a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2612,7 +2612,7 @@ static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 		stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan,
 				rxfifosz, qmode);
 
-		if (rx_q->xsk_pool) {
+		if (rx_q->xsk_pool && rx_q->buf_alloc_num) {
 			buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
 			stmmac_set_dma_bfsize(priv, priv->ioaddr,
 					      buf_size,
-- 
2.47.3

[PATCH net-next 09/15] net: stmmac: add helper to set receive buffer size

[Russell King (Oracle)]

There are three sites that configure the hardware for the receive
buffer size using the same logic to determine the buffer size.
Add a helper so there is only one copy of this code.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 54 ++++++++-----------
 1 file changed, 21 insertions(+), 33 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 787b02c2607a..47b536c15c0e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -393,6 +393,24 @@ static void stmmac_set_queue_rx_tail_ptr(struct stmmac_priv *priv,
 	stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_tail_addr, chan);
 }
 
+static void stmmac_set_queue_rx_buf_size(struct stmmac_priv *priv,
+					 struct stmmac_rx_queue *rx_q,
+					 unsigned int chan)
+{
+	u32 buf_size;
+
+	if (rx_q->xsk_pool && rx_q->buf_alloc_num) {
+		buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
+		stmmac_set_dma_bfsize(priv, priv->ioaddr,
+				      buf_size,
+				      rx_q->queue_index);
+	} else {
+		stmmac_set_dma_bfsize(priv, priv->ioaddr,
+				      priv->dma_conf.dma_buf_sz,
+				      rx_q->queue_index);
+	}
+}
+
 /**
  * stmmac_rx_dirty - Get RX queue dirty
  * @priv: driver private structure
@@ -2605,23 +2623,13 @@ static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 	/* configure all channels */
 	for (chan = 0; chan < rx_channels_count; chan++) {
 		struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[chan];
-		u32 buf_size;
 
 		qmode = priv->plat->rx_queues_cfg[chan].mode_to_use;
 
 		stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan,
 				rxfifosz, qmode);
 
-		if (rx_q->xsk_pool && rx_q->buf_alloc_num) {
-			buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
-			stmmac_set_dma_bfsize(priv, priv->ioaddr,
-					      buf_size,
-					      chan);
-		} else {
-			stmmac_set_dma_bfsize(priv, priv->ioaddr,
-					      priv->dma_conf.dma_buf_sz,
-					      chan);
-		}
+		stmmac_set_queue_rx_buf_size(priv, rx_q, chan);
 	}
 
 	for (chan = 0; chan < tx_channels_count; chan++) {
@@ -6935,7 +6943,6 @@ void stmmac_enable_rx_queue(struct stmmac_priv *priv, u32 queue)
 	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];
 	struct stmmac_channel *ch = &priv->channel[queue];
 	unsigned long flags;
-	u32 buf_size;
 	int ret;
 
 	ret = __alloc_dma_rx_desc_resources(priv, &priv->dma_conf, queue);
@@ -6960,16 +6967,7 @@ void stmmac_enable_rx_queue(struct stmmac_priv *priv, u32 queue)
 	stmmac_set_queue_rx_tail_ptr(priv, rx_q, rx_q->queue_index,
 				     rx_q->buf_alloc_num);
 
-	if (rx_q->xsk_pool && rx_q->buf_alloc_num) {
-		buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
-		stmmac_set_dma_bfsize(priv, priv->ioaddr,
-				      buf_size,
-				      rx_q->queue_index);
-	} else {
-		stmmac_set_dma_bfsize(priv, priv->ioaddr,
-				      priv->dma_conf.dma_buf_sz,
-				      rx_q->queue_index);
-	}
+	stmmac_set_queue_rx_buf_size(priv, rx_q, rx_q->queue_index);
 
 	stmmac_start_rx_dma(priv, queue);
 
@@ -7072,7 +7070,6 @@ int stmmac_xdp_open(struct net_device *dev)
 	u8 dma_csr_ch = max(rx_cnt, tx_cnt);
 	struct stmmac_rx_queue *rx_q;
 	struct stmmac_tx_queue *tx_q;
-	u32 buf_size;
 	bool sph_en;
 	u8 chan;
 	int ret;
@@ -7112,16 +7109,7 @@ int stmmac_xdp_open(struct net_device *dev)
 		stmmac_set_queue_rx_tail_ptr(priv, rx_q, chan,
 					     rx_q->buf_alloc_num);
 
-		if (rx_q->xsk_pool && rx_q->buf_alloc_num) {
-			buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
-			stmmac_set_dma_bfsize(priv, priv->ioaddr,
-					      buf_size,
-					      rx_q->queue_index);
-		} else {
-			stmmac_set_dma_bfsize(priv, priv->ioaddr,
-					      priv->dma_conf.dma_buf_sz,
-					      rx_q->queue_index);
-		}
+		stmmac_set_queue_rx_buf_size(priv, rx_q, chan);
 
 		stmmac_enable_sph(priv, priv->ioaddr, sph_en, chan);
 	}
-- 
2.47.3

[PATCH net-next 10/15] net: stmmac: simplify stmmac_set_queue_rx_buf_size()

[Russell King (Oracle)]

Clean up the new stmmac_set_queue_rx_buf_size() to simplify the code.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 47b536c15c0e..032ef9fba8b4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -399,16 +399,12 @@ static void stmmac_set_queue_rx_buf_size(struct stmmac_priv *priv,
 {
 	u32 buf_size;
 
-	if (rx_q->xsk_pool && rx_q->buf_alloc_num) {
+	if (rx_q->xsk_pool && rx_q->buf_alloc_num)
 		buf_size = xsk_pool_get_rx_frame_size(rx_q->xsk_pool);
-		stmmac_set_dma_bfsize(priv, priv->ioaddr,
-				      buf_size,
-				      rx_q->queue_index);
-	} else {
-		stmmac_set_dma_bfsize(priv, priv->ioaddr,
-				      priv->dma_conf.dma_buf_sz,
-				      rx_q->queue_index);
-	}
+	else
+		buf_size = priv->dma_conf.dma_buf_sz;
+
+	stmmac_set_dma_bfsize(priv, priv->ioaddr, buf_size, rx_q->queue_index);
 }
 
 /**
-- 
2.47.3

[PATCH net-next 11/15] net: stmmac: add helper to get hardware transmit descriptor

[Russell King (Oracle)]

Provide a helper to get the hardware transmit descriptor that takes
account of whether extended format and TBS are being used, returning
the base struct dma_desc pointer. This avoids multiple instances where
these tests are open coded.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 87 ++++++-------------
 1 file changed, 25 insertions(+), 62 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 032ef9fba8b4..76e4dcf8f697 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -362,6 +362,18 @@ static inline u32 stmmac_tx_avail(struct stmmac_priv *priv, u32 queue)
 			  priv->dma_conf.dma_tx_size);
 }
 
+static struct dma_desc *stmmac_get_tx_desc(struct stmmac_priv *priv,
+					   struct stmmac_tx_queue *tx_q,
+					   unsigned int index)
+{
+	if (priv->extend_desc)
+		return &tx_q->dma_etx[index].basic;
+	else if (tx_q->tbs & STMMAC_TBS_AVAIL)
+		return &tx_q->dma_entx[index].basic;
+	else
+		return &tx_q->dma_tx[index];
+}
+
 static size_t stmmac_get_rx_desc_size(struct stmmac_priv *priv)
 {
 	if (priv->extend_desc)
@@ -1489,16 +1501,14 @@ static void stmmac_display_tx_rings(struct stmmac_priv *priv,
 
 		pr_info("\tTX Queue %d rings\n", queue);
 
-		if (priv->extend_desc) {
-			head_tx = (void *)tx_q->dma_etx;
+		if (priv->extend_desc)
 			desc_size = sizeof(struct dma_extended_desc);
-		} else if (tx_q->tbs & STMMAC_TBS_AVAIL) {
-			head_tx = (void *)tx_q->dma_entx;
+		else if (tx_q->tbs & STMMAC_TBS_AVAIL)
 			desc_size = sizeof(struct dma_edesc);
-		} else {
-			head_tx = (void *)tx_q->dma_tx;
+		else
 			desc_size = sizeof(struct dma_desc);
-		}
+
+		head_tx = stmmac_get_tx_desc(priv, tx_q, 0);
 
 		stmmac_display_ring(priv, head_tx, dma_conf->dma_tx_size, false,
 				    tx_q->dma_tx_phy, desc_size);
@@ -1587,13 +1597,7 @@ static void stmmac_clear_tx_descriptors(struct stmmac_priv *priv,
 		int last = (i == (dma_conf->dma_tx_size - 1));
 		struct dma_desc *p;
 
-		if (priv->extend_desc)
-			p = &tx_q->dma_etx[i].basic;
-		else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-			p = &tx_q->dma_entx[i].basic;
-		else
-			p = &tx_q->dma_tx[i];
-
+		p = stmmac_get_tx_desc(priv, tx_q, i);
 		stmmac_init_tx_desc(priv, p, priv->mode, last);
 	}
 }
@@ -2021,13 +2025,7 @@ static int __init_dma_tx_desc_rings(struct stmmac_priv *priv,
 	for (i = 0; i < dma_conf->dma_tx_size; i++) {
 		struct dma_desc *p;
 
-		if (priv->extend_desc)
-			p = &((tx_q->dma_etx + i)->basic);
-		else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-			p = &((tx_q->dma_entx + i)->basic);
-		else
-			p = tx_q->dma_tx + i;
-
+		p = stmmac_get_tx_desc(priv, tx_q, i);
 		stmmac_clear_desc(priv, p);
 		stmmac_set_tx_skb_dma_entry(tx_q, i, 0, 0, false);
 
@@ -2730,13 +2728,7 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
 			continue;
 		}
 
-		if (likely(priv->extend_desc))
-			tx_desc = (struct dma_desc *)(tx_q->dma_etx + entry);
-		else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-			tx_desc = &tx_q->dma_entx[entry].basic;
-		else
-			tx_desc = tx_q->dma_tx + entry;
-
+		tx_desc = stmmac_get_tx_desc(priv, tx_q, entry);
 		dma_addr = xsk_buff_raw_get_dma(pool, xdp_desc.addr);
 		meta = xsk_buff_get_metadata(pool, xdp_desc.addr);
 		xsk_buff_raw_dma_sync_for_device(pool, dma_addr, xdp_desc.len);
@@ -2863,13 +2855,7 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue,
 			skb = NULL;
 		}
 
-		if (priv->extend_desc)
-			p = (struct dma_desc *)(tx_q->dma_etx + entry);
-		else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-			p = &tx_q->dma_entx[entry].basic;
-		else
-			p = tx_q->dma_tx + entry;
-
+		p = stmmac_get_tx_desc(priv, tx_q, entry);
 		status = stmmac_tx_status(priv,	&priv->xstats, p, priv->ioaddr);
 		/* Check if the descriptor is owned by the DMA */
 		if (unlikely(status & tx_dma_own))
@@ -4752,13 +4738,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 		csum_insertion = !csum_insertion;
 	}
 
-	if (likely(priv->extend_desc))
-		desc = (struct dma_desc *)(tx_q->dma_etx + entry);
-	else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-		desc = &tx_q->dma_entx[entry].basic;
-	else
-		desc = tx_q->dma_tx + entry;
-
+	desc = stmmac_get_tx_desc(priv, tx_q, entry);
 	first = desc;
 
 	if (has_vlan)
@@ -4783,12 +4763,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 		entry = STMMAC_GET_ENTRY(entry, priv->dma_conf.dma_tx_size);
 		WARN_ON(tx_q->tx_skbuff[entry]);
 
-		if (likely(priv->extend_desc))
-			desc = (struct dma_desc *)(tx_q->dma_etx + entry);
-		else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-			desc = &tx_q->dma_entx[entry].basic;
-		else
-			desc = tx_q->dma_tx + entry;
+		desc = stmmac_get_tx_desc(priv, tx_q, entry);
 
 		des = skb_frag_dma_map(priv->device, frag, 0, len,
 				       DMA_TO_DEVICE);
@@ -4829,13 +4804,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 		set_ic = false;
 
 	if (set_ic) {
-		if (likely(priv->extend_desc))
-			desc = &tx_q->dma_etx[entry].basic;
-		else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-			desc = &tx_q->dma_entx[entry].basic;
-		else
-			desc = &tx_q->dma_tx[entry];
-
+		desc = stmmac_get_tx_desc(priv, tx_q, entry);
 		tx_q->tx_count_frames = 0;
 		stmmac_set_tx_ic(priv, desc);
 	}
@@ -5103,13 +5072,7 @@ static int stmmac_xdp_xmit_xdpf(struct stmmac_priv *priv, int queue,
 		return STMMAC_XDP_CONSUMED;
 	}
 
-	if (likely(priv->extend_desc))
-		tx_desc = (struct dma_desc *)(tx_q->dma_etx + entry);
-	else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-		tx_desc = &tx_q->dma_entx[entry].basic;
-	else
-		tx_desc = tx_q->dma_tx + entry;
-
+	tx_desc = stmmac_get_tx_desc(priv, tx_q, entry);
 	if (dma_map) {
 		dma_addr = dma_map_single(priv->device, xdpf->data,
 					  xdpf->len, DMA_TO_DEVICE);
-- 
2.47.3

[PATCH net-next 12/15] net: stmmac: add helper to get size of a transmit descriptor

[Russell King (Oracle)]

Add and use a helper to get the size of the hardware transmit
descriptor.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 40 +++++++------------
 1 file changed, 15 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 76e4dcf8f697..da1726b887f3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -362,6 +362,17 @@ static inline u32 stmmac_tx_avail(struct stmmac_priv *priv, u32 queue)
 			  priv->dma_conf.dma_tx_size);
 }
 
+static size_t stmmac_get_tx_desc_size(struct stmmac_priv *priv,
+				      struct stmmac_tx_queue *tx_q)
+{
+	if (priv->extend_desc)
+		return sizeof(struct dma_extended_desc);
+	else if (tx_q->tbs & STMMAC_TBS_AVAIL)
+		return sizeof(struct dma_edesc);
+	else
+		return sizeof(struct dma_desc);
+}
+
 static struct dma_desc *stmmac_get_tx_desc(struct stmmac_priv *priv,
 					   struct stmmac_tx_queue *tx_q,
 					   unsigned int index)
@@ -1501,14 +1512,8 @@ static void stmmac_display_tx_rings(struct stmmac_priv *priv,
 
 		pr_info("\tTX Queue %d rings\n", queue);
 
-		if (priv->extend_desc)
-			desc_size = sizeof(struct dma_extended_desc);
-		else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-			desc_size = sizeof(struct dma_edesc);
-		else
-			desc_size = sizeof(struct dma_desc);
-
 		head_tx = stmmac_get_tx_desc(priv, tx_q, 0);
+		desc_size = stmmac_get_tx_desc_size(priv, tx_q);
 
 		stmmac_display_ring(priv, head_tx, dma_conf->dma_tx_size, false,
 				    tx_q->dma_tx_phy, desc_size);
@@ -2186,17 +2191,14 @@ static void __free_dma_tx_desc_resources(struct stmmac_priv *priv,
 	dma_free_tx_skbufs(priv, dma_conf, queue);
 
 	if (priv->extend_desc) {
-		size = sizeof(struct dma_extended_desc);
 		addr = tx_q->dma_etx;
 	} else if (tx_q->tbs & STMMAC_TBS_AVAIL) {
-		size = sizeof(struct dma_edesc);
 		addr = tx_q->dma_entx;
 	} else {
-		size = sizeof(struct dma_desc);
 		addr = tx_q->dma_tx;
 	}
 
-	size *= dma_conf->dma_tx_size;
+	size = stmmac_get_tx_desc_size(priv, tx_q) * dma_conf->dma_tx_size;
 
 	dma_free_coherent(priv->device, size, addr, tx_q->dma_tx_phy);
 
@@ -2358,14 +2360,7 @@ static int __alloc_dma_tx_desc_resources(struct stmmac_priv *priv,
 	if (!tx_q->tx_skbuff)
 		return -ENOMEM;
 
-	if (priv->extend_desc)
-		size = sizeof(struct dma_extended_desc);
-	else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-		size = sizeof(struct dma_edesc);
-	else
-		size = sizeof(struct dma_desc);
-
-	size *= dma_conf->dma_tx_size;
+	size = stmmac_get_tx_desc_size(priv, tx_q) * dma_conf->dma_tx_size;
 
 	addr = dma_alloc_coherent(priv->device, size,
 				  &tx_q->dma_tx_phy, GFP_KERNEL);
@@ -4333,12 +4328,7 @@ static void stmmac_flush_tx_descriptors(struct stmmac_priv *priv, int queue)
 	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
 	int desc_size;
 
-	if (likely(priv->extend_desc))
-		desc_size = sizeof(struct dma_extended_desc);
-	else if (tx_q->tbs & STMMAC_TBS_AVAIL)
-		desc_size = sizeof(struct dma_edesc);
-	else
-		desc_size = sizeof(struct dma_desc);
+	desc_size = stmmac_get_tx_desc_size(priv, tx_q);
 
 	/* The own bit must be the latest setting done when prepare the
 	 * descriptor and then barrier is needed to make sure that
-- 
2.47.3

[PATCH net-next 13/15] net: stmmac: add helper to set transmit tail pointer

[Russell King (Oracle)]

Setting the queue transmit tail pointer follows a common pattern:
calculate the DMA address, and then call stmmac_set_tx_tail_ptr().
The only difference between all the call sites is the index used.

Factor this out into a static function.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 30 ++++++++++---------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index da1726b887f3..4521469c5e1d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -385,6 +385,18 @@ static struct dma_desc *stmmac_get_tx_desc(struct stmmac_priv *priv,
 		return &tx_q->dma_tx[index];
 }
 
+static void stmmac_set_queue_tx_tail_ptr(struct stmmac_priv *priv,
+					 struct stmmac_tx_queue *tx_q,
+					 unsigned int chan, unsigned int index)
+{
+	int desc_size;
+
+	desc_size = stmmac_get_tx_desc_size(priv, tx_q);
+
+	tx_q->tx_tail_addr = tx_q->dma_tx_phy + index * desc_size;
+	stmmac_set_tx_tail_ptr(priv, priv->ioaddr, tx_q->tx_tail_addr, chan);
+}
+
 static size_t stmmac_get_rx_desc_size(struct stmmac_priv *priv)
 {
 	if (priv->extend_desc)
@@ -3311,9 +3323,7 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 		stmmac_init_tx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
 				    tx_q->dma_tx_phy, chan);
 
-		tx_q->tx_tail_addr = tx_q->dma_tx_phy;
-		stmmac_set_tx_tail_ptr(priv, priv->ioaddr,
-				       tx_q->tx_tail_addr, chan);
+		stmmac_set_queue_tx_tail_ptr(priv, tx_q, chan, 0);
 	}
 
 	return ret;
@@ -4326,9 +4336,6 @@ static void stmmac_tso_allocator(struct stmmac_priv *priv, dma_addr_t des,
 static void stmmac_flush_tx_descriptors(struct stmmac_priv *priv, int queue)
 {
 	struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
-	int desc_size;
-
-	desc_size = stmmac_get_tx_desc_size(priv, tx_q);
 
 	/* The own bit must be the latest setting done when prepare the
 	 * descriptor and then barrier is needed to make sure that
@@ -4336,8 +4343,7 @@ static void stmmac_flush_tx_descriptors(struct stmmac_priv *priv, int queue)
 	 */
 	wmb();
 
-	tx_q->tx_tail_addr = tx_q->dma_tx_phy + (tx_q->cur_tx * desc_size);
-	stmmac_set_tx_tail_ptr(priv, priv->ioaddr, tx_q->tx_tail_addr, queue);
+	stmmac_set_queue_tx_tail_ptr(priv, tx_q, queue, tx_q->cur_tx);
 }
 
 /**
@@ -6967,9 +6973,7 @@ void stmmac_enable_tx_queue(struct stmmac_priv *priv, u32 queue)
 	if (tx_q->tbs & STMMAC_TBS_AVAIL)
 		stmmac_enable_tbs(priv, priv->ioaddr, 1, tx_q->queue_index);
 
-	tx_q->tx_tail_addr = tx_q->dma_tx_phy;
-	stmmac_set_tx_tail_ptr(priv, priv->ioaddr,
-			       tx_q->tx_tail_addr, tx_q->queue_index);
+	stmmac_set_queue_tx_tail_ptr(priv, tx_q, tx_q->queue_index, 0);
 
 	stmmac_start_tx_dma(priv, queue);
 
@@ -7070,9 +7074,7 @@ int stmmac_xdp_open(struct net_device *dev)
 		stmmac_init_tx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
 				    tx_q->dma_tx_phy, chan);
 
-		tx_q->tx_tail_addr = tx_q->dma_tx_phy;
-		stmmac_set_tx_tail_ptr(priv, priv->ioaddr,
-				       tx_q->tx_tail_addr, chan);
+		stmmac_set_queue_tx_tail_ptr(priv, tx_q, chan, 0);
 
 		hrtimer_setup(&tx_q->txtimer, stmmac_tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	}
-- 
2.47.3

[PATCH net-next 14/15] net: stmmac: remove tx_tail_addr

[Russell King (Oracle)]

There is only one place where tx_q->tx_tail_addr is used - the new
stmmac_set_queue_tx_tail_ptr(). Make this a local variable and remove
it from struct stmmac_tx_queue.

This commit does not change the semantics - the hardware relies upon
the descriptor ring not crossing a 4GiB boundary as the high address
bits are programmed into a separate register via stmmac_init_tx_chan().
Hence, truncating the DMA address to 32-bit is fine as the register it
will be programmed into is 32-bit, and the high bits are handled
elsewhere.

Also change the type of desc_size to size_t, as this variable is
initialised from sizeof().

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h      | 1 -
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 7 ++++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index d1f8383d1c04..7cc5967aecd7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -79,7 +79,6 @@ struct stmmac_tx_queue {
 	unsigned int cur_tx;
 	unsigned int dirty_tx;
 	dma_addr_t dma_tx_phy;
-	dma_addr_t tx_tail_addr;
 	u32 mss;
 };
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 4521469c5e1d..55b79e9e637f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -389,12 +389,13 @@ static void stmmac_set_queue_tx_tail_ptr(struct stmmac_priv *priv,
 					 struct stmmac_tx_queue *tx_q,
 					 unsigned int chan, unsigned int index)
 {
-	int desc_size;
+	size_t desc_size;
+	u32 tx_tail_addr;
 
 	desc_size = stmmac_get_tx_desc_size(priv, tx_q);
 
-	tx_q->tx_tail_addr = tx_q->dma_tx_phy + index * desc_size;
-	stmmac_set_tx_tail_ptr(priv, priv->ioaddr, tx_q->tx_tail_addr, chan);
+	tx_tail_addr = tx_q->dma_tx_phy + index * desc_size;
+	stmmac_set_tx_tail_ptr(priv, priv->ioaddr, tx_tail_addr, chan);
 }
 
 static size_t stmmac_get_rx_desc_size(struct stmmac_priv *priv)
-- 
2.47.3

[PATCH net-next 15/15] net: stmmac: use queue rather than ->queue_index

[Russell King (Oracle)]

We use a lot of ->queue_index where we already have the queue / channel
index (which are actually the same index), which has been used to get
the queue struct. Since queue and queue_index are identical in
priv->(tx|rx)_queue[queue]->queue_index there is no point using the
queue_index where we already have queue.

Use queue rather than queue_index.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 25 ++++++++-----------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 55b79e9e637f..8393cbd0875e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -440,7 +440,7 @@ static void stmmac_set_queue_rx_buf_size(struct stmmac_priv *priv,
 	else
 		buf_size = priv->dma_conf.dma_buf_sz;
 
-	stmmac_set_dma_bfsize(priv, priv->ioaddr, buf_size, rx_q->queue_index);
+	stmmac_set_dma_bfsize(priv, priv->ioaddr, buf_size, chan);
 }
 
 /**
@@ -1902,7 +1902,7 @@ static int __init_dma_rx_desc_rings(struct stmmac_priv *priv,
 						   NULL));
 		netdev_info(priv->dev,
 			    "Register MEM_TYPE_XSK_BUFF_POOL RxQ-%d\n",
-			    rx_q->queue_index);
+			    queue);
 		xsk_pool_set_rxq_info(rx_q->xsk_pool, &rx_q->xdp_rxq);
 	} else {
 		WARN_ON(xdp_rxq_info_reg_mem_model(&rx_q->xdp_rxq,
@@ -1910,7 +1910,7 @@ static int __init_dma_rx_desc_rings(struct stmmac_priv *priv,
 						   rx_q->page_pool));
 		netdev_info(priv->dev,
 			    "Register MEM_TYPE_PAGE_POOL RxQ-%d\n",
-			    rx_q->queue_index);
+			    queue);
 	}
 
 	if (rx_q->xsk_pool) {
@@ -2310,9 +2310,7 @@ static int __alloc_dma_rx_desc_resources(struct stmmac_priv *priv,
 	else
 		napi_id = ch->rx_napi.napi_id;
 
-	ret = xdp_rxq_info_reg(&rx_q->xdp_rxq, priv->dev,
-			       rx_q->queue_index,
-			       napi_id);
+	ret = xdp_rxq_info_reg(&rx_q->xdp_rxq, priv->dev, queue, napi_id);
 	if (ret) {
 		netdev_err(priv->dev, "Failed to register xdp rxq info\n");
 		return -EINVAL;
@@ -3340,7 +3338,7 @@ static void stmmac_tx_timer_arm(struct stmmac_priv *priv, u32 queue)
 	if (!tx_coal_timer)
 		return;
 
-	ch = &priv->channel[tx_q->queue_index];
+	ch = &priv->channel[queue];
 	napi = tx_q->xsk_pool ? &ch->rxtx_napi : &ch->tx_napi;
 
 	/* Arm timer only if napi is not already scheduled.
@@ -6918,12 +6916,11 @@ void stmmac_enable_rx_queue(struct stmmac_priv *priv, u32 queue)
 	stmmac_clear_rx_descriptors(priv, &priv->dma_conf, queue);
 
 	stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
-			    rx_q->dma_rx_phy, rx_q->queue_index);
+			    rx_q->dma_rx_phy, queue);
 
-	stmmac_set_queue_rx_tail_ptr(priv, rx_q, rx_q->queue_index,
-				     rx_q->buf_alloc_num);
+	stmmac_set_queue_rx_tail_ptr(priv, rx_q, queue, rx_q->buf_alloc_num);
 
-	stmmac_set_queue_rx_buf_size(priv, rx_q, rx_q->queue_index);
+	stmmac_set_queue_rx_buf_size(priv, rx_q, queue);
 
 	stmmac_start_rx_dma(priv, queue);
 
@@ -6969,12 +6966,12 @@ void stmmac_enable_tx_queue(struct stmmac_priv *priv, u32 queue)
 	stmmac_clear_tx_descriptors(priv, &priv->dma_conf, queue);
 
 	stmmac_init_tx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
-			    tx_q->dma_tx_phy, tx_q->queue_index);
+			    tx_q->dma_tx_phy, queue);
 
 	if (tx_q->tbs & STMMAC_TBS_AVAIL)
-		stmmac_enable_tbs(priv, priv->ioaddr, 1, tx_q->queue_index);
+		stmmac_enable_tbs(priv, priv->ioaddr, 1, queue);
 
-	stmmac_set_queue_tx_tail_ptr(priv, tx_q, tx_q->queue_index, 0);
+	stmmac_set_queue_tx_tail_ptr(priv, tx_q, queue, 0);
 
 	stmmac_start_tx_dma(priv, queue);
 
-- 
2.47.3