[PATCH net-next v4 2/3] net: ti: icssg-prueth: introduce and use prueth_swdata struct for SWDATA

From: Meghana Malladi
Date: Wed Mar 05 2025 - 05:15:53 EST

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In reply to: Meghana Malladi: "[PATCH net-next v4 1/3] net: ti: icssg-prueth: Use page_pool API for RX buffer allocation"
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From: Roger Quadros <rogerq@xxxxxxxxxx>

We have different cases for SWDATA (skb, page, cmd, etc)
so it is better to have a dedicated data structure for that.
We can embed the type field inside the struct and use it
to interpret the data in completion handlers.

Signed-off-by: Roger Quadros <rogerq@xxxxxxxxxx>
Signed-off-by: MD Danish Anwar <danishanwar@xxxxxx>
Signed-off-by: Meghana Malladi <m-malladi@xxxxxx>
---
Changes from v3 (v4-v3):
- remove SWDATA size information from commit message
- Fix handling of packets for non-skb type inside emac_tx_complete_packets()
- Remove incrementing budget for incorrect swdata type
- use PRUETH_SWDATA_CMD in emac_send_command_sr1()
All the above changes are suggested by Roger Quadros <rogerq@xxxxxxxxxx> and
Dan Carpenter <dan.carpenter@xxxxxxxxxx>

drivers/net/ethernet/ti/icssg/icssg_common.c | 52 +++++++++++--------
drivers/net/ethernet/ti/icssg/icssg_prueth.c | 3 ++
drivers/net/ethernet/ti/icssg/icssg_prueth.h | 16 ++++++
.../net/ethernet/ti/icssg/icssg_prueth_sr1.c | 9 ++--
4 files changed, 54 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c
index acbb79ad8b0c..fee1204db367 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_common.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_common.c
@@ -136,12 +136,12 @@ int emac_tx_complete_packets(struct prueth_emac *emac, int chn,
struct net_device *ndev = emac->ndev;
struct cppi5_host_desc_t *desc_tx;
struct netdev_queue *netif_txq;
+ struct prueth_swdata *swdata;
struct prueth_tx_chn *tx_chn;
unsigned int total_bytes = 0;
struct sk_buff *skb;
dma_addr_t desc_dma;
int res, num_tx = 0;
- void **swdata;

tx_chn = &emac->tx_chns[chn];

@@ -161,16 +161,11 @@ int emac_tx_complete_packets(struct prueth_emac *emac, int chn,
desc_tx = k3_cppi_desc_pool_dma2virt(tx_chn->desc_pool,
desc_dma);
swdata = cppi5_hdesc_get_swdata(desc_tx);
-
- /* was this command's TX complete? */
- if (emac->is_sr1 && *(swdata) == emac->cmd_data) {
- prueth_xmit_free(tx_chn, desc_tx);
- continue;
- }
-
- skb = *(swdata);
prueth_xmit_free(tx_chn, desc_tx);
+ if (swdata->type != PRUETH_SWDATA_SKB)
+ continue;

+ skb = swdata->data.skb;
ndev = skb->dev;
ndev->stats.tx_packets++;
ndev->stats.tx_bytes += skb->len;
@@ -472,9 +467,9 @@ int prueth_dma_rx_push_mapped(struct prueth_emac *emac,
{
struct net_device *ndev = emac->ndev;
struct cppi5_host_desc_t *desc_rx;
+ struct prueth_swdata *swdata;
dma_addr_t desc_dma;
dma_addr_t buf_dma;
- void **swdata;

buf_dma = page_pool_get_dma_addr(page) + PRUETH_HEADROOM;
desc_rx = k3_cppi_desc_pool_alloc(rx_chn->desc_pool);
@@ -490,7 +485,8 @@ int prueth_dma_rx_push_mapped(struct prueth_emac *emac,
cppi5_hdesc_attach_buf(desc_rx, buf_dma, buf_len, buf_dma, buf_len);

swdata = cppi5_hdesc_get_swdata(desc_rx);
- *swdata = page;
+ swdata->type = PRUETH_SWDATA_PAGE;
+ swdata->data.page = page;

return k3_udma_glue_push_rx_chn(rx_chn->rx_chn, PRUETH_RX_FLOW_DATA,
desc_rx, desc_dma);
@@ -539,11 +535,11 @@ static int emac_rx_packet(struct prueth_emac *emac, u32 flow_id)
u32 buf_dma_len, pkt_len, port_id = 0;
struct net_device *ndev = emac->ndev;
struct cppi5_host_desc_t *desc_rx;
+ struct prueth_swdata *swdata;
dma_addr_t desc_dma, buf_dma;
struct page *page, *new_page;
struct page_pool *pool;
struct sk_buff *skb;
- void **swdata;
u32 *psdata;
void *pa;
int ret;
@@ -561,7 +557,13 @@ static int emac_rx_packet(struct prueth_emac *emac, u32 flow_id)

desc_rx = k3_cppi_desc_pool_dma2virt(rx_chn->desc_pool, desc_dma);
swdata = cppi5_hdesc_get_swdata(desc_rx);
- page = *swdata;
+ if (swdata->type != PRUETH_SWDATA_PAGE) {
+ netdev_err(ndev, "rx_pkt: invalid swdata->type %d\n", swdata->type);
+ k3_cppi_desc_pool_free(rx_chn->desc_pool, desc_rx);
+ return 0;
+ }
+
+ page = swdata->data.page;
page_pool_dma_sync_for_cpu(pool, page, 0, PAGE_SIZE);
cppi5_hdesc_get_obuf(desc_rx, &buf_dma, &buf_dma_len);
k3_udma_glue_rx_cppi5_to_dma_addr(rx_chn->rx_chn, &buf_dma);
@@ -626,15 +628,18 @@ static void prueth_rx_cleanup(void *data, dma_addr_t desc_dma)
{
struct prueth_rx_chn *rx_chn = data;
struct cppi5_host_desc_t *desc_rx;
+ struct prueth_swdata *swdata;
struct page_pool *pool;
struct page *page;
- void **swdata;

pool = rx_chn->pg_pool;
desc_rx = k3_cppi_desc_pool_dma2virt(rx_chn->desc_pool, desc_dma);
swdata = cppi5_hdesc_get_swdata(desc_rx);
- page = *swdata;
- page_pool_recycle_direct(pool, page);
+ if (swdata->type == PRUETH_SWDATA_PAGE) {
+ page = swdata->data.page;
+ page_pool_recycle_direct(pool, page);
+ }
+
k3_cppi_desc_pool_free(rx_chn->desc_pool, desc_rx);
}

@@ -671,13 +676,13 @@ enum netdev_tx icssg_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev
struct prueth_emac *emac = netdev_priv(ndev);
struct prueth *prueth = emac->prueth;
struct netdev_queue *netif_txq;
+ struct prueth_swdata *swdata;
struct prueth_tx_chn *tx_chn;
dma_addr_t desc_dma, buf_dma;
u32 pkt_len, dst_tag_id;
int i, ret = 0, q_idx;
bool in_tx_ts = 0;
int tx_ts_cookie;
- void **swdata;
u32 *epib;

pkt_len = skb_headlen(skb);
@@ -739,7 +744,8 @@ enum netdev_tx icssg_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev
k3_udma_glue_tx_dma_to_cppi5_addr(tx_chn->tx_chn, &buf_dma);
cppi5_hdesc_attach_buf(first_desc, buf_dma, pkt_len, buf_dma, pkt_len);
swdata = cppi5_hdesc_get_swdata(first_desc);
- *swdata = skb;
+ swdata->type = PRUETH_SWDATA_SKB;
+ swdata->data.skb = skb;

/* Handle the case where skb is fragmented in pages */
cur_desc = first_desc;
@@ -842,15 +848,17 @@ static void prueth_tx_cleanup(void *data, dma_addr_t desc_dma)
{
struct prueth_tx_chn *tx_chn = data;
struct cppi5_host_desc_t *desc_tx;
+ struct prueth_swdata *swdata;
struct sk_buff *skb;
- void **swdata;

desc_tx = k3_cppi_desc_pool_dma2virt(tx_chn->desc_pool, desc_dma);
swdata = cppi5_hdesc_get_swdata(desc_tx);
- skb = *(swdata);
- prueth_xmit_free(tx_chn, desc_tx);
+ if (swdata->type == PRUETH_SWDATA_SKB) {
+ skb = swdata->data.skb;
+ dev_kfree_skb_any(skb);
+ }

- dev_kfree_skb_any(skb);
+ prueth_xmit_free(tx_chn, desc_tx);
}

irqreturn_t prueth_rx_irq(int irq, void *dev_id)
diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
index 00ed97860547..3ff8c322f9d9 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
@@ -1522,6 +1522,9 @@ static int prueth_probe(struct platform_device *pdev)

np = dev->of_node;

+ BUILD_BUG_ON_MSG((sizeof(struct prueth_swdata) > PRUETH_NAV_SW_DATA_SIZE),
+ "insufficient SW_DATA size");
+
prueth = devm_kzalloc(dev, sizeof(*prueth), GFP_KERNEL);
if (!prueth)
return -ENOMEM;
diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.h b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
index c7b906de18af..3bbabd007129 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth.h
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
@@ -136,6 +136,22 @@ struct prueth_rx_chn {
struct page_pool *pg_pool;
};

+enum prueth_swdata_type {
+ PRUETH_SWDATA_INVALID = 0,
+ PRUETH_SWDATA_SKB,
+ PRUETH_SWDATA_PAGE,
+ PRUETH_SWDATA_CMD,
+};
+
+struct prueth_swdata {
+ enum prueth_swdata_type type;
+ union prueth_data {
+ struct sk_buff *skb;
+ struct page *page;
+ u32 cmd;
+ } data;
+};
+
/* There are 4 Tx DMA channels, but the highest priority is CH3 (thread 3)
* and lower three are lower priority channels or threads.
*/
diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
index 8f5719a98614..ff5f41bf499e 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
@@ -84,7 +84,7 @@ static int emac_send_command_sr1(struct prueth_emac *emac, u32 cmd)
__le32 *data = emac->cmd_data;
dma_addr_t desc_dma, buf_dma;
struct prueth_tx_chn *tx_chn;
- void **swdata;
+ struct prueth_swdata *swdata;
int ret = 0;
u32 *epib;

@@ -122,7 +122,8 @@ static int emac_send_command_sr1(struct prueth_emac *emac, u32 cmd)

cppi5_hdesc_attach_buf(first_desc, buf_dma, pkt_len, buf_dma, pkt_len);
swdata = cppi5_hdesc_get_swdata(first_desc);
- *swdata = data;
+ swdata->type = PRUETH_SWDATA_CMD;
+ swdata->data.cmd = le32_to_cpu(data[0]);

cppi5_hdesc_set_pktlen(first_desc, pkt_len);
desc_dma = k3_cppi_desc_pool_virt2dma(tx_chn->desc_pool, first_desc);
@@ -275,9 +276,9 @@ static struct page *prueth_process_rx_mgm(struct prueth_emac *emac,
struct net_device *ndev = emac->ndev;
struct cppi5_host_desc_t *desc_rx;
struct page *page, *new_page;
+ struct prueth_swdata *swdata;
dma_addr_t desc_dma, buf_dma;
u32 buf_dma_len;
- void **swdata;
int ret;

ret = k3_udma_glue_pop_rx_chn(rx_chn->rx_chn, flow_id, &desc_dma);
@@ -299,7 +300,7 @@ static struct page *prueth_process_rx_mgm(struct prueth_emac *emac,
}

swdata = cppi5_hdesc_get_swdata(desc_rx);
- page = *swdata;
+ page = swdata->data.page;
cppi5_hdesc_get_obuf(desc_rx, &buf_dma, &buf_dma_len);

dma_unmap_single(rx_chn->dma_dev, buf_dma, buf_dma_len, DMA_FROM_DEVICE);
--
2.43.0

Next message: Meghana Malladi: "[PATCH net-next v4 0/3] net: ti: icssg-prueth: Add native mode XDP support"
Previous message: Mathis Foerst: "[PATCH v3 0/6] MT9M114 driver bugfix and improvements"
In reply to: Meghana Malladi: "[PATCH net-next v4 1/3] net: ti: icssg-prueth: Use page_pool API for RX buffer allocation"
Next in thread: Meghana Malladi: "[PATCH net-next v4 3/3] net: ti: icssg-prueth: Add XDP support"
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