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Message-Id: <e9ad915633d1e7e02d4b9021761d325d4b130101.1570662004.git.lorenzo@kernel.org>
Date: Thu, 10 Oct 2019 01:18:33 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com, davem@...emloft.net,
thomas.petazzoni@...tlin.com, brouer@...hat.com,
ilias.apalodimas@...aro.org, matteo.croce@...hat.com,
mw@...ihalf.com
Subject: [PATCH v2 net-next 3/8] net: mvneta: rely on build_skb in mvneta_rx_swbm poll routine
Refactor mvneta_rx_swbm code introducing mvneta_swbm_rx_frame and
mvneta_swbm_add_rx_fragment routines. Rely on build_skb in oreder to
allocate skb since the previous patch introduced buffer recycling using
the page_pool API.
This patch fixes even an issue in the original driver where dma buffers
are accessed before dma sync
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
drivers/net/ethernet/marvell/mvneta.c | 198 ++++++++++++++------------
1 file changed, 104 insertions(+), 94 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 31cecc1ed848..79a6bac0192b 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -323,6 +323,11 @@
ETH_HLEN + ETH_FCS_LEN, \
cache_line_size())
+#define MVNETA_SKB_PAD (SKB_DATA_ALIGN(sizeof(struct skb_shared_info) + \
+ NET_SKB_PAD))
+#define MVNETA_SKB_SIZE(len) (SKB_DATA_ALIGN(len) + MVNETA_SKB_PAD)
+#define MVNETA_MAX_RX_BUF_SIZE (PAGE_SIZE - MVNETA_SKB_PAD)
+
#define IS_TSO_HEADER(txq, addr) \
((addr >= txq->tso_hdrs_phys) && \
(addr < txq->tso_hdrs_phys + txq->size * TSO_HEADER_SIZE))
@@ -646,7 +651,6 @@ static int txq_number = 8;
static int rxq_def;
static int rx_copybreak __read_mostly = 256;
-static int rx_header_size __read_mostly = 128;
/* HW BM need that each port be identify by a unique ID */
static int global_port_id;
@@ -1942,30 +1946,102 @@ int mvneta_rx_refill_queue(struct mvneta_port *pp, struct mvneta_rx_queue *rxq)
return i;
}
+static int
+mvneta_swbm_rx_frame(struct mvneta_port *pp,
+ struct mvneta_rx_desc *rx_desc,
+ struct mvneta_rx_queue *rxq,
+ struct page *page)
+{
+ unsigned char *data = page_address(page);
+ int data_len = -MVNETA_MH_SIZE, len;
+ struct net_device *dev = pp->dev;
+ enum dma_data_direction dma_dir;
+
+ if (MVNETA_SKB_SIZE(rx_desc->data_size) > PAGE_SIZE) {
+ len = MVNETA_MAX_RX_BUF_SIZE;
+ data_len += len;
+ } else {
+ len = rx_desc->data_size;
+ data_len += len - ETH_FCS_LEN;
+ }
+
+ dma_dir = page_pool_get_dma_dir(rxq->page_pool);
+ dma_sync_single_range_for_cpu(dev->dev.parent,
+ rx_desc->buf_phys_addr, 0,
+ len, dma_dir);
+
+ rxq->skb = build_skb(data, PAGE_SIZE);
+ if (unlikely(!rxq->skb)) {
+ netdev_err(dev,
+ "Can't allocate skb on queue %d\n",
+ rxq->id);
+ dev->stats.rx_dropped++;
+ rxq->skb_alloc_err++;
+ return -ENOMEM;
+ }
+ page_pool_release_page(rxq->page_pool, page);
+
+ skb_reserve(rxq->skb, MVNETA_MH_SIZE + NET_SKB_PAD);
+ skb_put(rxq->skb, data_len);
+ mvneta_rx_csum(pp, rx_desc->status, rxq->skb);
+
+ rxq->left_size = rx_desc->data_size - len;
+ rx_desc->buf_phys_addr = 0;
+
+ return 0;
+}
+
+static void
+mvneta_swbm_add_rx_fragment(struct mvneta_port *pp,
+ struct mvneta_rx_desc *rx_desc,
+ struct mvneta_rx_queue *rxq,
+ struct page *page)
+{
+ struct net_device *dev = pp->dev;
+ enum dma_data_direction dma_dir;
+ int data_len, len;
+
+ if (rxq->left_size > MVNETA_MAX_RX_BUF_SIZE) {
+ len = MVNETA_MAX_RX_BUF_SIZE;
+ data_len = len;
+ } else {
+ len = rxq->left_size;
+ data_len = len - ETH_FCS_LEN;
+ }
+ dma_dir = page_pool_get_dma_dir(rxq->page_pool);
+ dma_sync_single_range_for_cpu(dev->dev.parent,
+ rx_desc->buf_phys_addr, 0,
+ len, dma_dir);
+ if (data_len > 0) {
+ /* refill descriptor with new buffer later */
+ skb_add_rx_frag(rxq->skb,
+ skb_shinfo(rxq->skb)->nr_frags,
+ page, NET_SKB_PAD, data_len,
+ PAGE_SIZE);
+
+ page_pool_release_page(rxq->page_pool, page);
+ rx_desc->buf_phys_addr = 0;
+ }
+ rxq->left_size -= len;
+}
+
/* Main rx processing when using software buffer management */
static int mvneta_rx_swbm(struct napi_struct *napi,
struct mvneta_port *pp, int budget,
struct mvneta_rx_queue *rxq)
{
- struct net_device *dev = pp->dev;
- int rx_todo, rx_proc;
- int refill = 0;
- u32 rcvd_pkts = 0;
- u32 rcvd_bytes = 0;
+ int rcvd_pkts = 0, rcvd_bytes = 0;
+ int rx_pending, refill, done = 0;
/* Get number of received packets */
- rx_todo = mvneta_rxq_busy_desc_num_get(pp, rxq);
- rx_proc = 0;
+ rx_pending = mvneta_rxq_busy_desc_num_get(pp, rxq);
/* Fairness NAPI loop */
- while ((rcvd_pkts < budget) && (rx_proc < rx_todo)) {
+ while (done < budget && done < rx_pending) {
struct mvneta_rx_desc *rx_desc = mvneta_rxq_next_desc_get(rxq);
unsigned char *data;
struct page *page;
- dma_addr_t phys_addr;
- u32 rx_status, index;
- int rx_bytes, skb_size, copy_size;
- int frag_num, frag_size, frag_offset;
+ int index;
index = rx_desc - rxq->descs;
page = (struct page *)rxq->buf_virt_addr[index];
@@ -1973,98 +2049,33 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
/* Prefetch header */
prefetch(data);
- phys_addr = rx_desc->buf_phys_addr;
- rx_status = rx_desc->status;
- rx_proc++;
rxq->refill_num++;
+ done++;
+
+ if (rx_desc->status & MVNETA_RXD_FIRST_DESC) {
+ int err;
- if (rx_status & MVNETA_RXD_FIRST_DESC) {
/* Check errors only for FIRST descriptor */
- if (rx_status & MVNETA_RXD_ERR_SUMMARY) {
+ if (rx_desc->status & MVNETA_RXD_ERR_SUMMARY) {
mvneta_rx_error(pp, rx_desc);
- dev->stats.rx_errors++;
+ pp->dev->stats.rx_errors++;
/* leave the descriptor untouched */
continue;
}
- rx_bytes = rx_desc->data_size -
- (ETH_FCS_LEN + MVNETA_MH_SIZE);
- /* Allocate small skb for each new packet */
- skb_size = max(rx_copybreak, rx_header_size);
- rxq->skb = netdev_alloc_skb_ip_align(dev, skb_size);
- if (unlikely(!rxq->skb)) {
- netdev_err(dev,
- "Can't allocate skb on queue %d\n",
- rxq->id);
- dev->stats.rx_dropped++;
- rxq->skb_alloc_err++;
+ err = mvneta_swbm_rx_frame(pp, rx_desc, rxq, page);
+ if (err)
continue;
- }
- copy_size = min(skb_size, rx_bytes);
-
- /* Copy data from buffer to SKB, skip Marvell header */
- memcpy(rxq->skb->data, data + MVNETA_MH_SIZE,
- copy_size);
- skb_put(rxq->skb, copy_size);
- rxq->left_size = rx_bytes - copy_size;
-
- mvneta_rx_csum(pp, rx_status, rxq->skb);
- if (rxq->left_size == 0) {
- int size = copy_size + MVNETA_MH_SIZE;
-
- dma_sync_single_range_for_cpu(dev->dev.parent,
- phys_addr, 0,
- size,
- DMA_FROM_DEVICE);
-
- /* leave the descriptor and buffer untouched */
- } else {
- /* refill descriptor with new buffer later */
- rx_desc->buf_phys_addr = 0;
-
- frag_num = 0;
- frag_offset = copy_size + MVNETA_MH_SIZE;
- frag_size = min(rxq->left_size,
- (int)(PAGE_SIZE - frag_offset));
- skb_add_rx_frag(rxq->skb, frag_num, page,
- frag_offset, frag_size,
- PAGE_SIZE);
- page_pool_release_page(rxq->page_pool, page);
- rxq->left_size -= frag_size;
- }
} else {
- /* Middle or Last descriptor */
if (unlikely(!rxq->skb)) {
pr_debug("no skb for rx_status 0x%x\n",
- rx_status);
+ rx_desc->status);
continue;
}
- if (!rxq->left_size) {
- /* last descriptor has only FCS */
- /* and can be discarded */
- dma_sync_single_range_for_cpu(dev->dev.parent,
- phys_addr, 0,
- ETH_FCS_LEN,
- DMA_FROM_DEVICE);
- /* leave the descriptor and buffer untouched */
- } else {
- /* refill descriptor with new buffer later */
- rx_desc->buf_phys_addr = 0;
-
- frag_num = skb_shinfo(rxq->skb)->nr_frags;
- frag_offset = 0;
- frag_size = min(rxq->left_size,
- (int)(PAGE_SIZE - frag_offset));
- skb_add_rx_frag(rxq->skb, frag_num, page,
- frag_offset, frag_size,
- PAGE_SIZE);
-
- page_pool_release_page(rxq->page_pool, page);
- rxq->left_size -= frag_size;
- }
+ mvneta_swbm_add_rx_fragment(pp, rx_desc, rxq, page);
} /* Middle or Last descriptor */
- if (!(rx_status & MVNETA_RXD_LAST_DESC))
+ if (!(rx_desc->status & MVNETA_RXD_LAST_DESC))
/* no last descriptor this time */
continue;
@@ -2080,13 +2091,12 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
rcvd_bytes += rxq->skb->len;
/* Linux processing */
- rxq->skb->protocol = eth_type_trans(rxq->skb, dev);
+ rxq->skb->protocol = eth_type_trans(rxq->skb, pp->dev);
napi_gro_receive(napi, rxq->skb);
/* clean uncomplete skb pointer in queue */
rxq->skb = NULL;
- rxq->left_size = 0;
}
mvneta_update_stats(pp, rcvd_pkts, rcvd_bytes, false);
@@ -2095,7 +2105,7 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
refill = mvneta_rx_refill_queue(pp, rxq);
/* Update rxq management counters */
- mvneta_rxq_desc_num_update(pp, rxq, rx_proc, refill);
+ mvneta_rxq_desc_num_update(pp, rxq, done, refill);
return rcvd_pkts;
}
@@ -2946,7 +2956,7 @@ static void mvneta_rxq_hw_init(struct mvneta_port *pp,
/* Set Offset */
mvneta_rxq_offset_set(pp, rxq, 0);
mvneta_rxq_buf_size_set(pp, rxq, PAGE_SIZE < SZ_64K ?
- PAGE_SIZE :
+ MVNETA_MAX_RX_BUF_SIZE :
MVNETA_RX_BUF_SIZE(pp->pkt_size));
mvneta_rxq_bm_disable(pp, rxq);
mvneta_rxq_fill(pp, rxq, rxq->size);
@@ -4656,7 +4666,7 @@ static int mvneta_probe(struct platform_device *pdev)
SET_NETDEV_DEV(dev, &pdev->dev);
pp->id = global_port_id++;
- pp->rx_offset_correction = 0; /* not relevant for SW BM */
+ pp->rx_offset_correction = NET_SKB_PAD;
/* Obtain access to BM resources if enabled and already initialized */
bm_node = of_parse_phandle(dn, "buffer-manager", 0);
--
2.21.0
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