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Date: Sat, 16 Jul 2022 09:34:27 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: nbd@....name, john@...ozen.org, sean.wang@...iatek.com,
Mark-MC.Lee@...iatek.com, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, matthias.bgg@...il.com,
linux-mediatek@...ts.infradead.org, ilias.apalodimas@...aro.org,
lorenzo.bianconi@...hat.com, jbrouer@...hat.com
Subject: [PATCH v3 net-next 1/5] net: ethernet: mtk_eth_soc: rely on page_pool for single page buffers
Rely on page_pool allocator for single page buffers in order to keep
them dma mapped and add skb recycling support.
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
drivers/net/ethernet/mediatek/Kconfig | 1 +
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 185 +++++++++++++++-----
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 10 ++
3 files changed, 156 insertions(+), 40 deletions(-)
diff --git a/drivers/net/ethernet/mediatek/Kconfig b/drivers/net/ethernet/mediatek/Kconfig
index da4ec235d146..d2422c7b31b0 100644
--- a/drivers/net/ethernet/mediatek/Kconfig
+++ b/drivers/net/ethernet/mediatek/Kconfig
@@ -17,6 +17,7 @@ config NET_MEDIATEK_SOC
select PINCTRL
select PHYLINK
select DIMLIB
+ select PAGE_POOL
help
This driver supports the gigabit ethernet MACs in the
MediaTek SoC family.
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 6beb3d4873a3..9a92d602ebd5 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1432,6 +1432,68 @@ static void mtk_update_rx_cpu_idx(struct mtk_eth *eth)
}
}
+static struct page_pool *mtk_create_page_pool(struct mtk_eth *eth,
+ struct xdp_rxq_info *xdp_q,
+ int id, int size)
+{
+ struct page_pool_params pp_params = {
+ .order = 0,
+ .flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV,
+ .pool_size = size,
+ .nid = NUMA_NO_NODE,
+ .dev = eth->dma_dev,
+ .dma_dir = DMA_FROM_DEVICE,
+ .offset = MTK_PP_HEADROOM,
+ .max_len = MTK_PP_MAX_BUF_SIZE,
+ };
+ struct page_pool *pp;
+ int err;
+
+ pp = page_pool_create(&pp_params);
+ if (IS_ERR(pp))
+ return pp;
+
+ err = __xdp_rxq_info_reg(xdp_q, ð->dummy_dev, eth->rx_napi.napi_id,
+ id, PAGE_SIZE);
+ if (err < 0)
+ goto err_free_pp;
+
+ err = xdp_rxq_info_reg_mem_model(xdp_q, MEM_TYPE_PAGE_POOL, pp);
+ if (err)
+ goto err_unregister_rxq;
+
+ return pp;
+
+err_unregister_rxq:
+ xdp_rxq_info_unreg(xdp_q);
+err_free_pp:
+ page_pool_destroy(pp);
+
+ return ERR_PTR(err);
+}
+
+static void *mtk_page_pool_get_buff(struct page_pool *pp, dma_addr_t *dma_addr,
+ gfp_t gfp_mask)
+{
+ struct page *page;
+
+ page = page_pool_alloc_pages(pp, gfp_mask | __GFP_NOWARN);
+ if (!page)
+ return NULL;
+
+ *dma_addr = page_pool_get_dma_addr(page) + MTK_PP_HEADROOM;
+ return page_address(page);
+}
+
+static void mtk_rx_put_buff(struct mtk_rx_ring *ring, void *data, bool napi)
+{
+ if (ring->page_pool)
+ page_pool_put_full_page(ring->page_pool,
+ virt_to_head_page(data), napi);
+ else
+ skb_free_frag(data);
+}
+
static int mtk_poll_rx(struct napi_struct *napi, int budget,
struct mtk_eth *eth)
{
@@ -1445,9 +1507,9 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
while (done < budget) {
unsigned int pktlen, *rxdcsum;
+ u32 hash, reason, reserve_len;
struct net_device *netdev;
dma_addr_t dma_addr;
- u32 hash, reason;
int mac = 0;
ring = mtk_get_rx_ring(eth);
@@ -1478,36 +1540,54 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
goto release_desc;
/* alloc new buffer */
- if (ring->frag_size <= PAGE_SIZE)
- new_data = napi_alloc_frag(ring->frag_size);
- else
- new_data = mtk_max_lro_buf_alloc(GFP_ATOMIC);
- if (unlikely(!new_data)) {
- netdev->stats.rx_dropped++;
- goto release_desc;
- }
- dma_addr = dma_map_single(eth->dma_dev,
- new_data + NET_SKB_PAD +
- eth->ip_align,
- ring->buf_size,
- DMA_FROM_DEVICE);
- if (unlikely(dma_mapping_error(eth->dma_dev, dma_addr))) {
- skb_free_frag(new_data);
- netdev->stats.rx_dropped++;
- goto release_desc;
- }
+ if (ring->page_pool) {
+ new_data = mtk_page_pool_get_buff(ring->page_pool,
+ &dma_addr,
+ GFP_ATOMIC);
+ if (unlikely(!new_data)) {
+ netdev->stats.rx_dropped++;
+ goto release_desc;
+ }
+ } else {
+ if (ring->frag_size <= PAGE_SIZE)
+ new_data = napi_alloc_frag(ring->frag_size);
+ else
+ new_data = mtk_max_lro_buf_alloc(GFP_ATOMIC);
+
+ if (unlikely(!new_data)) {
+ netdev->stats.rx_dropped++;
+ goto release_desc;
+ }
- dma_unmap_single(eth->dma_dev, trxd.rxd1,
- ring->buf_size, DMA_FROM_DEVICE);
+ dma_addr = dma_map_single(eth->dma_dev,
+ new_data + NET_SKB_PAD + eth->ip_align,
+ ring->buf_size, DMA_FROM_DEVICE);
+ if (unlikely(dma_mapping_error(eth->dma_dev,
+ dma_addr))) {
+ skb_free_frag(new_data);
+ netdev->stats.rx_dropped++;
+ goto release_desc;
+ }
+
+ dma_unmap_single(eth->dma_dev, trxd.rxd1,
+ ring->buf_size, DMA_FROM_DEVICE);
+ }
/* receive data */
skb = build_skb(data, ring->frag_size);
if (unlikely(!skb)) {
- skb_free_frag(data);
+ mtk_rx_put_buff(ring, data, true);
netdev->stats.rx_dropped++;
goto skip_rx;
}
- skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
+
+ if (ring->page_pool) {
+ reserve_len = MTK_PP_HEADROOM;
+ skb_mark_for_recycle(skb);
+ } else {
+ reserve_len = NET_SKB_PAD + NET_IP_ALIGN;
+ }
+ skb_reserve(skb, reserve_len);
pktlen = RX_DMA_GET_PLEN0(trxd.rxd2);
skb->dev = netdev;
@@ -1561,7 +1641,6 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
skip_rx:
ring->data[idx] = new_data;
rxd->rxd1 = (unsigned int)dma_addr;
-
release_desc:
if (MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628))
rxd->rxd2 = RX_DMA_LSO;
@@ -1569,7 +1648,6 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
rxd->rxd2 = RX_DMA_PREP_PLEN0(ring->buf_size);
ring->calc_idx = idx;
-
done++;
}
@@ -1933,13 +2011,15 @@ static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag)
if (!ring->data)
return -ENOMEM;
- for (i = 0; i < rx_dma_size; i++) {
- if (ring->frag_size <= PAGE_SIZE)
- ring->data[i] = netdev_alloc_frag(ring->frag_size);
- else
- ring->data[i] = mtk_max_lro_buf_alloc(GFP_KERNEL);
- if (!ring->data[i])
- return -ENOMEM;
+ if (!eth->hwlro) {
+ struct page_pool *pp;
+
+ pp = mtk_create_page_pool(eth, &ring->xdp_q, ring_no,
+ rx_dma_size);
+ if (IS_ERR(pp))
+ return PTR_ERR(pp);
+
+ ring->page_pool = pp;
}
ring->dma = dma_alloc_coherent(eth->dma_dev,
@@ -1950,16 +2030,33 @@ static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag)
for (i = 0; i < rx_dma_size; i++) {
struct mtk_rx_dma_v2 *rxd;
-
- dma_addr_t dma_addr = dma_map_single(eth->dma_dev,
- ring->data[i] + NET_SKB_PAD + eth->ip_align,
- ring->buf_size,
- DMA_FROM_DEVICE);
- if (unlikely(dma_mapping_error(eth->dma_dev, dma_addr)))
- return -ENOMEM;
+ dma_addr_t dma_addr;
+ void *data;
rxd = ring->dma + i * eth->soc->txrx.rxd_size;
+ if (ring->page_pool) {
+ data = mtk_page_pool_get_buff(ring->page_pool,
+ &dma_addr, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+ } else {
+ if (ring->frag_size <= PAGE_SIZE)
+ data = netdev_alloc_frag(ring->frag_size);
+ else
+ data = mtk_max_lro_buf_alloc(GFP_KERNEL);
+
+ if (!data)
+ return -ENOMEM;
+
+ dma_addr = dma_map_single(eth->dma_dev,
+ data + NET_SKB_PAD + eth->ip_align,
+ ring->buf_size, DMA_FROM_DEVICE);
+ if (unlikely(dma_mapping_error(eth->dma_dev,
+ dma_addr)))
+ return -ENOMEM;
+ }
rxd->rxd1 = (unsigned int)dma_addr;
+ ring->data[i] = data;
if (MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628))
rxd->rxd2 = RX_DMA_LSO;
@@ -1975,6 +2072,7 @@ static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag)
rxd->rxd8 = 0;
}
}
+
ring->dma_size = rx_dma_size;
ring->calc_idx_update = false;
ring->calc_idx = rx_dma_size - 1;
@@ -2026,7 +2124,7 @@ static void mtk_rx_clean(struct mtk_eth *eth, struct mtk_rx_ring *ring)
dma_unmap_single(eth->dma_dev, rxd->rxd1,
ring->buf_size, DMA_FROM_DEVICE);
- skb_free_frag(ring->data[i]);
+ mtk_rx_put_buff(ring, ring->data[i], false);
}
kfree(ring->data);
ring->data = NULL;
@@ -2038,6 +2136,13 @@ static void mtk_rx_clean(struct mtk_eth *eth, struct mtk_rx_ring *ring)
ring->dma, ring->phys);
ring->dma = NULL;
}
+
+ if (ring->page_pool) {
+ if (xdp_rxq_info_is_reg(&ring->xdp_q))
+ xdp_rxq_info_unreg(&ring->xdp_q);
+ page_pool_destroy(ring->page_pool);
+ ring->page_pool = NULL;
+ }
}
static int mtk_hwlro_rx_init(struct mtk_eth *eth)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 0a632896451a..26c019319055 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -18,6 +18,8 @@
#include <linux/rhashtable.h>
#include <linux/dim.h>
#include <linux/bitfield.h>
+#include <net/page_pool.h>
+#include <linux/bpf_trace.h>
#include "mtk_ppe.h"
#define MTK_QDMA_PAGE_SIZE 2048
@@ -49,6 +51,11 @@
#define MTK_HW_FEATURES_MT7628 (NETIF_F_SG | NETIF_F_RXCSUM)
#define NEXT_DESP_IDX(X, Y) (((X) + 1) & ((Y) - 1))
+#define MTK_PP_HEADROOM XDP_PACKET_HEADROOM
+#define MTK_PP_PAD (MTK_PP_HEADROOM + \
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
+#define MTK_PP_MAX_BUF_SIZE (PAGE_SIZE - MTK_PP_PAD)
+
#define MTK_QRX_OFFSET 0x10
#define MTK_MAX_RX_RING_NUM 4
@@ -745,6 +752,9 @@ struct mtk_rx_ring {
bool calc_idx_update;
u16 calc_idx;
u32 crx_idx_reg;
+ /* page_pool */
+ struct page_pool *page_pool;
+ struct xdp_rxq_info xdp_q;
};
enum mkt_eth_capabilities {
--
2.36.1
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