diff options
Diffstat (limited to 'target/linux/lantiq/patches-5.10/0704-v5.17-net-lantiq_xrx200-add-ingress-SG-DMA-support.patch')
| -rw-r--r-- | target/linux/lantiq/patches-5.10/0704-v5.17-net-lantiq_xrx200-add-ingress-SG-DMA-support.patch | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/target/linux/lantiq/patches-5.10/0704-v5.17-net-lantiq_xrx200-add-ingress-SG-DMA-support.patch b/target/linux/lantiq/patches-5.10/0704-v5.17-net-lantiq_xrx200-add-ingress-SG-DMA-support.patch deleted file mode 100644 index f2c36952fc..0000000000 --- a/target/linux/lantiq/patches-5.10/0704-v5.17-net-lantiq_xrx200-add-ingress-SG-DMA-support.patch +++ /dev/null @@ -1,104 +0,0 @@ -From c3e6b2c35b34214c58c1e90d65dab5f5393608e7 Mon Sep 17 00:00:00 2001 -From: Aleksander Jan Bajkowski <olek2@wp.pl> -Date: Mon, 3 Jan 2022 20:43:16 +0100 -Subject: [PATCH] net: lantiq_xrx200: add ingress SG DMA support - -This patch adds support for scatter gather DMA. DMA in PMAC splits -the packet into several buffers when the MTU on the CPU port is -less than the MTU of the switch. The first buffer starts at an -offset of NET_IP_ALIGN. In subsequent buffers, dma ignores the -offset. Thanks to this patch, the user can still connect to the -device in such a situation. For normal configurations, the patch -has no effect on performance. - -Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl> -Signed-off-by: David S. Miller <davem@davemloft.net> ---- - drivers/net/ethernet/lantiq_xrx200.c | 47 +++++++++++++++++++++++----- - 1 file changed, 40 insertions(+), 7 deletions(-) - ---- a/drivers/net/ethernet/lantiq_xrx200.c -+++ b/drivers/net/ethernet/lantiq_xrx200.c -@@ -26,6 +26,9 @@ - #define XRX200_DMA_RX 0 - #define XRX200_DMA_TX 1 - -+#define XRX200_DMA_PACKET_COMPLETE 0 -+#define XRX200_DMA_PACKET_IN_PROGRESS 1 -+ - /* cpu port mac */ - #define PMAC_RX_IPG 0x0024 - #define PMAC_RX_IPG_MASK 0xf -@@ -61,6 +64,9 @@ struct xrx200_chan { - struct ltq_dma_channel dma; - struct sk_buff *skb[LTQ_DESC_NUM]; - -+ struct sk_buff *skb_head; -+ struct sk_buff *skb_tail; -+ - struct xrx200_priv *priv; - }; - -@@ -204,7 +210,8 @@ static int xrx200_hw_receive(struct xrx2 - struct xrx200_priv *priv = ch->priv; - struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc]; - struct sk_buff *skb = ch->skb[ch->dma.desc]; -- int len = (desc->ctl & LTQ_DMA_SIZE_MASK); -+ u32 ctl = desc->ctl; -+ int len = (ctl & LTQ_DMA_SIZE_MASK); - struct net_device *net_dev = priv->net_dev; - int ret; - -@@ -220,12 +227,36 @@ static int xrx200_hw_receive(struct xrx2 - } - - skb_put(skb, len); -- skb->protocol = eth_type_trans(skb, net_dev); -- netif_receive_skb(skb); -- net_dev->stats.rx_packets++; -- net_dev->stats.rx_bytes += len; - -- return 0; -+ /* add buffers to skb via skb->frag_list */ -+ if (ctl & LTQ_DMA_SOP) { -+ ch->skb_head = skb; -+ ch->skb_tail = skb; -+ } else if (ch->skb_head) { -+ if (ch->skb_head == ch->skb_tail) -+ skb_shinfo(ch->skb_tail)->frag_list = skb; -+ else -+ ch->skb_tail->next = skb; -+ ch->skb_tail = skb; -+ skb_reserve(ch->skb_tail, -NET_IP_ALIGN); -+ ch->skb_head->len += skb->len; -+ ch->skb_head->data_len += skb->len; -+ ch->skb_head->truesize += skb->truesize; -+ } -+ -+ if (ctl & LTQ_DMA_EOP) { -+ ch->skb_head->protocol = eth_type_trans(ch->skb_head, net_dev); -+ netif_receive_skb(ch->skb_head); -+ net_dev->stats.rx_packets++; -+ net_dev->stats.rx_bytes += ch->skb_head->len; -+ ch->skb_head = NULL; -+ ch->skb_tail = NULL; -+ ret = XRX200_DMA_PACKET_COMPLETE; -+ } else { -+ ret = XRX200_DMA_PACKET_IN_PROGRESS; -+ } -+ -+ return ret; - } - - static int xrx200_poll_rx(struct napi_struct *napi, int budget) -@@ -240,7 +271,9 @@ static int xrx200_poll_rx(struct napi_st - - if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) { - ret = xrx200_hw_receive(ch); -- if (ret) -+ if (ret == XRX200_DMA_PACKET_IN_PROGRESS) -+ continue; -+ if (ret != XRX200_DMA_PACKET_COMPLETE) - return ret; - rx++; - } else { |