Merge branch 'net-ethernet-ti-am65-cpsw-fixes-to-multi-queue-rx-feature'

Roger Quadros says:

====================
net: ethernet: ti: am65-cpsw: Fixes to multi queue RX feature

On J7 platforms, setting up multiple RX flows was failing
as the RX free descriptor ring 0 is shared among all flows
and we did not allocate enough elements in the RX free descriptor
ring 0 to accommodate for all RX flows. Patch 1 fixes this.

The second patch fixes a warning if there was any error in
am65_cpsw_nuss_init_rx_chns() and am65_cpsw_nuss_cleanup_rx_chns()
was called after that.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
====================

Link: https://patch.msgid.link/20241101-am65-cpsw-multi-rx-j7-fix-v3-0-338fdd6a55da@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

2 files changed, 37 insertions, 44 deletions

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 0520e9f4bea7..ba6db61dd227 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -337,9 +337,9 @@ static int am65_cpsw_nuss_rx_push(struct am65_cpsw_common *common,
 	struct am65_cpsw_rx_chn *rx_chn = &common->rx_chns;
 	struct cppi5_host_desc_t *desc_rx;
 	struct device *dev = common->dev;
+	struct am65_cpsw_swdata *swdata;
 	dma_addr_t desc_dma;
 	dma_addr_t buf_dma;
-	void *swdata;
 
 	desc_rx = k3_cppi_desc_pool_alloc(rx_chn->desc_pool);
 	if (!desc_rx) {
@@ -363,7 +363,8 @@ static int am65_cpsw_nuss_rx_push(struct am65_cpsw_common *common,
 	cppi5_hdesc_attach_buf(desc_rx, buf_dma, AM65_CPSW_MAX_PACKET_SIZE,
 			       buf_dma, AM65_CPSW_MAX_PACKET_SIZE);
 	swdata = cppi5_hdesc_get_swdata(desc_rx);
-	*((void **)swdata) = page_address(page);
+	swdata->page = page;
+	swdata->flow_id = flow_idx;
 
 	return k3_udma_glue_push_rx_chn(rx_chn->rx_chn, flow_idx,
 					desc_rx, desc_dma);
@@ -519,36 +520,31 @@ static enum am65_cpsw_tx_buf_type am65_cpsw_nuss_buf_type(struct am65_cpsw_tx_ch
 
 static inline void am65_cpsw_put_page(struct am65_cpsw_rx_flow *flow,
 				      struct page *page,
-				      bool allow_direct,
-				      int desc_idx)
+				      bool allow_direct)
 {
 	page_pool_put_full_page(flow->page_pool, page, allow_direct);
-	flow->pages[desc_idx] = NULL;
 }
 
 static void am65_cpsw_nuss_rx_cleanup(void *data, dma_addr_t desc_dma)
 {
-	struct am65_cpsw_rx_flow *flow = data;
+	struct am65_cpsw_rx_chn *rx_chn = data;
 	struct cppi5_host_desc_t *desc_rx;
-	struct am65_cpsw_rx_chn *rx_chn;
+	struct am65_cpsw_swdata *swdata;
 	dma_addr_t buf_dma;
+	struct page *page;
 	u32 buf_dma_len;
-	void *page_addr;
-	void **swdata;
-	int desc_idx;
+	u32 flow_id;
 
-	rx_chn = &flow->common->rx_chns;
 	desc_rx = k3_cppi_desc_pool_dma2virt(rx_chn->desc_pool, desc_dma);
 	swdata = cppi5_hdesc_get_swdata(desc_rx);
-	page_addr = *swdata;
+	page = swdata->page;
+	flow_id = swdata->flow_id;
 	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);
 	dma_unmap_single(rx_chn->dma_dev, buf_dma, buf_dma_len, DMA_FROM_DEVICE);
 	k3_cppi_desc_pool_free(rx_chn->desc_pool, desc_rx);
 
-	desc_idx = am65_cpsw_nuss_desc_idx(rx_chn->desc_pool, desc_rx,
-					   rx_chn->dsize_log2);
-	am65_cpsw_put_page(flow, virt_to_page(page_addr), false, desc_idx);
+	am65_cpsw_put_page(&rx_chn->flows[flow_id], page, false);
 }
 
 static void am65_cpsw_nuss_xmit_free(struct am65_cpsw_tx_chn *tx_chn,
@@ -703,14 +699,13 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
 				ret = -ENOMEM;
 				goto fail_rx;
 			}
-			flow->pages[i] = page;
 
 			ret = am65_cpsw_nuss_rx_push(common, page, flow_idx);
 			if (ret < 0) {
 				dev_err(common->dev,
 					"cannot submit page to rx channel flow %d, error %d\n",
 					flow_idx, ret);
-				am65_cpsw_put_page(flow, page, false, i);
+				am65_cpsw_put_page(flow, page, false);
 				goto fail_rx;
 			}
 		}
@@ -764,8 +759,8 @@ fail_tx:
 
 fail_rx:
 	for (i = 0; i < common->rx_ch_num_flows; i++)
-		k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, i, &rx_chn->flows[i],
-					  am65_cpsw_nuss_rx_cleanup, 0);
+		k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, i, rx_chn,
+					  am65_cpsw_nuss_rx_cleanup, !!i);
 
 	am65_cpsw_destroy_xdp_rxqs(common);
 
@@ -817,11 +812,11 @@ static int am65_cpsw_nuss_common_stop(struct am65_cpsw_common *common)
 			dev_err(common->dev, "rx teardown timeout\n");
 	}
 
-	for (i = 0; i < common->rx_ch_num_flows; i++) {
+	for (i = common->rx_ch_num_flows - 1; i >= 0; i--) {
 		napi_disable(&rx_chn->flows[i].napi_rx);
 		hrtimer_cancel(&rx_chn->flows[i].rx_hrtimer);
-		k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, i, &rx_chn->flows[i],
-					  am65_cpsw_nuss_rx_cleanup, 0);
+		k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, i, rx_chn,
+					  am65_cpsw_nuss_rx_cleanup, !!i);
 	}
 
 	k3_udma_glue_disable_rx_chn(rx_chn->rx_chn);
@@ -1028,7 +1023,7 @@ pool_free:
 static int am65_cpsw_run_xdp(struct am65_cpsw_rx_flow *flow,
 			     struct am65_cpsw_port *port,
 			     struct xdp_buff *xdp,
-			     int desc_idx, int cpu, int *len)
+			     int cpu, int *len)
 {
 	struct am65_cpsw_common *common = flow->common;
 	struct am65_cpsw_ndev_priv *ndev_priv;
@@ -1101,7 +1096,7 @@ drop:
 	}
 
 	page = virt_to_head_page(xdp->data);
-	am65_cpsw_put_page(flow, page, true, desc_idx);
+	am65_cpsw_put_page(flow, page, true);
 
 out:
 	return ret;
@@ -1150,16 +1145,16 @@ static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_rx_flow *flow,
 	struct am65_cpsw_ndev_stats *stats;
 	struct cppi5_host_desc_t *desc_rx;
 	struct device *dev = common->dev;
+	struct am65_cpsw_swdata *swdata;
 	struct page *page, *new_page;
 	dma_addr_t desc_dma, buf_dma;
 	struct am65_cpsw_port *port;
-	int headroom, desc_idx, ret;
 	struct net_device *ndev;
 	u32 flow_idx = flow->id;
 	struct sk_buff *skb;
 	struct xdp_buff	xdp;
+	int headroom, ret;
 	void *page_addr;
-	void **swdata;
 	u32 *psdata;
 
 	*xdp_state = AM65_CPSW_XDP_PASS;
@@ -1182,8 +1177,8 @@ static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_rx_flow *flow,
 		__func__, flow_idx, &desc_dma);
 
 	swdata = cppi5_hdesc_get_swdata(desc_rx);
-	page_addr = *swdata;
-	page = virt_to_page(page_addr);
+	page = swdata->page;
+	page_addr = page_address(page);
 	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);
 	pkt_len = cppi5_hdesc_get_pktlen(desc_rx);
@@ -1199,9 +1194,6 @@ static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_rx_flow *flow,
 
 	k3_cppi_desc_pool_free(rx_chn->desc_pool, desc_rx);
 
-	desc_idx = am65_cpsw_nuss_desc_idx(rx_chn->desc_pool, desc_rx,
-					   rx_chn->dsize_log2);
-
 	skb = am65_cpsw_build_skb(page_addr, ndev,
 				  AM65_CPSW_MAX_PACKET_SIZE);
 	if (unlikely(!skb)) {
@@ -1213,7 +1205,7 @@ static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_rx_flow *flow,
 		xdp_init_buff(&xdp, PAGE_SIZE, &port->xdp_rxq[flow->id]);
 		xdp_prepare_buff(&xdp, page_addr, AM65_CPSW_HEADROOM,
 				 pkt_len, false);
-		*xdp_state = am65_cpsw_run_xdp(flow, port, &xdp, desc_idx,
+		*xdp_state = am65_cpsw_run_xdp(flow, port, &xdp,
 					       cpu, &pkt_len);
 		if (*xdp_state != AM65_CPSW_XDP_PASS)
 			goto allocate;
@@ -1247,10 +1239,8 @@ allocate:
 		return -ENOMEM;
 	}
 
-	flow->pages[desc_idx] = new_page;
-
 	if (netif_dormant(ndev)) {
-		am65_cpsw_put_page(flow, new_page, true, desc_idx);
+		am65_cpsw_put_page(flow, new_page, true);
 		ndev->stats.rx_dropped++;
 		return 0;
 	}
@@ -1258,7 +1248,7 @@ allocate:
 requeue:
 	ret = am65_cpsw_nuss_rx_push(common, new_page, flow_idx);
 	if (WARN_ON(ret < 0)) {
-		am65_cpsw_put_page(flow, new_page, true, desc_idx);
+		am65_cpsw_put_page(flow, new_page, true);
 		ndev->stats.rx_errors++;
 		ndev->stats.rx_dropped++;
 	}
@@ -2402,10 +2392,6 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
 	for (i = 0; i < common->rx_ch_num_flows; i++) {
 		flow = &rx_chn->flows[i];
 		flow->page_pool = NULL;
-		flow->pages = devm_kcalloc(dev, AM65_CPSW_MAX_RX_DESC,
-					   sizeof(*flow->pages), GFP_KERNEL);
-		if (!flow->pages)
-			return -ENOMEM;
 	}
 
 	rx_chn->rx_chn = k3_udma_glue_request_rx_chn(dev, "rx", &rx_cfg);
@@ -2455,10 +2441,12 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
 		flow = &rx_chn->flows[i];
 		flow->id = i;
 		flow->common = common;
+		flow->irq = -EINVAL;
 
 		rx_flow_cfg.ring_rxfdq0_id = fdqring_id;
 		rx_flow_cfg.rx_cfg.size = max_desc_num;
-		rx_flow_cfg.rxfdq_cfg.size = max_desc_num;
+		/* share same FDQ for all flows */
+		rx_flow_cfg.rxfdq_cfg.size = max_desc_num * rx_cfg.flow_id_num;
 		rx_flow_cfg.rxfdq_cfg.mode = common->pdata.fdqring_mode;
 
 		ret = k3_udma_glue_rx_flow_init(rx_chn->rx_chn,
@@ -2496,6 +2484,7 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
 		if (ret) {
 			dev_err(dev, "failure requesting rx %d irq %u, %d\n",
 				i, flow->irq, ret);
+			flow->irq = -EINVAL;
 			goto err;
 		}
 	}
@@ -3349,8 +3338,8 @@ static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common)
 
 	for (i = 0; i < common->rx_ch_num_flows; i++)
 		k3_udma_glue_reset_rx_chn(rx_chan->rx_chn, i,
-					  &rx_chan->flows[i],
-					  am65_cpsw_nuss_rx_cleanup, 0);
+					  rx_chan,
+					  am65_cpsw_nuss_rx_cleanup, !!i);
 
 	k3_udma_glue_disable_rx_chn(rx_chan->rx_chn);
 
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.h b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
index dc8d544230dc..92a27ba4c601 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.h
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
@@ -101,10 +101,14 @@ struct am65_cpsw_rx_flow {
 	struct hrtimer rx_hrtimer;
 	unsigned long rx_pace_timeout;
 	struct page_pool *page_pool;
-	struct page **pages;
 	char name[32];
 };
 
+struct am65_cpsw_swdata {
+	u32 flow_id;
+	struct page *page;
+};
+
 struct am65_cpsw_rx_chn {
 	struct device *dev;
 	struct device *dma_dev;