1 files changed, 279 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfd3/rings.c b/drivers/net/ethernet/netronome/nfp/nfd3/rings.c
new file mode 100644
index 000000000000..a03190c9313c
--- /dev/null
+++ b/drivers/net/ethernet/netronome/nfp/nfd3/rings.c
@@ -0,0 +1,279 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2015-2019 Netronome Systems, Inc. */
+
+#include <linux/seq_file.h>
+
+#include "../nfp_net.h"
+#include "../nfp_net_dp.h"
+#include "../nfp_net_xsk.h"
+#include "nfd3.h"
+
+static void nfp_nfd3_xsk_tx_bufs_free(struct nfp_net_tx_ring *tx_ring)
+{
+	struct nfp_nfd3_tx_buf *txbuf;
+	unsigned int idx;
+
+	while (tx_ring->rd_p != tx_ring->wr_p) {
+		idx = D_IDX(tx_ring, tx_ring->rd_p);
+		txbuf = &tx_ring->txbufs[idx];
+
+		txbuf->real_len = 0;
+
+		tx_ring->qcp_rd_p++;
+		tx_ring->rd_p++;
+
+		if (tx_ring->r_vec->xsk_pool) {
+			if (txbuf->is_xsk_tx)
+				nfp_nfd3_xsk_tx_free(txbuf);
+
+			xsk_tx_completed(tx_ring->r_vec->xsk_pool, 1);
+		}
+	}
+}
+
+/**
+ * nfp_nfd3_tx_ring_reset() - Free any untransmitted buffers and reset pointers
+ * @dp:		NFP Net data path struct
+ * @tx_ring:	TX ring structure
+ *
+ * Assumes that the device is stopped, must be idempotent.
+ */
+static void
+nfp_nfd3_tx_ring_reset(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
+{
+	struct netdev_queue *nd_q;
+	const skb_frag_t *frag;
+
+	while (!tx_ring->is_xdp && tx_ring->rd_p != tx_ring->wr_p) {
+		struct nfp_nfd3_tx_buf *tx_buf;
+		struct sk_buff *skb;
+		int idx, nr_frags;
+
+		idx = D_IDX(tx_ring, tx_ring->rd_p);
+		tx_buf = &tx_ring->txbufs[idx];
+
+		skb = tx_ring->txbufs[idx].skb;
+		nr_frags = skb_shinfo(skb)->nr_frags;
+
+		if (tx_buf->fidx == -1) {
+			/* unmap head */
+			dma_unmap_single(dp->dev, tx_buf->dma_addr,
+					 skb_headlen(skb), DMA_TO_DEVICE);
+		} else {
+			/* unmap fragment */
+			frag = &skb_shinfo(skb)->frags[tx_buf->fidx];
+			dma_unmap_page(dp->dev, tx_buf->dma_addr,
+				       skb_frag_size(frag), DMA_TO_DEVICE);
+		}
+
+		/* check for last gather fragment */
+		if (tx_buf->fidx == nr_frags - 1)
+			dev_kfree_skb_any(skb);
+
+		tx_buf->dma_addr = 0;
+		tx_buf->skb = NULL;
+		tx_buf->fidx = -2;
+
+		tx_ring->qcp_rd_p++;
+		tx_ring->rd_p++;
+	}
+
+	if (tx_ring->is_xdp)
+		nfp_nfd3_xsk_tx_bufs_free(tx_ring);
+
+	memset(tx_ring->txds, 0, tx_ring->size);
+	tx_ring->wr_p = 0;
+	tx_ring->rd_p = 0;
+	tx_ring->qcp_rd_p = 0;
+	tx_ring->wr_ptr_add = 0;
+
+	if (tx_ring->is_xdp || !dp->netdev)
+		return;
+
+	nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
+	netdev_tx_reset_queue(nd_q);
+}
+
+/**
+ * nfp_nfd3_tx_ring_free() - Free resources allocated to a TX ring
+ * @tx_ring:   TX ring to free
+ */
+static void nfp_nfd3_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
+{
+	struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
+	struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
+
+	kvfree(tx_ring->txbufs);
+
+	if (tx_ring->txds)
+		dma_free_coherent(dp->dev, tx_ring->size,
+				  tx_ring->txds, tx_ring->dma);
+
+	tx_ring->cnt = 0;
+	tx_ring->txbufs = NULL;
+	tx_ring->txds = NULL;
+	tx_ring->dma = 0;
+	tx_ring->size = 0;
+}
+
+/**
+ * nfp_nfd3_tx_ring_alloc() - Allocate resource for a TX ring
+ * @dp:        NFP Net data path struct
+ * @tx_ring:   TX Ring structure to allocate
+ *
+ * Return: 0 on success, negative errno otherwise.
+ */
+static int
+nfp_nfd3_tx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
+{
+	struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
+
+	tx_ring->cnt = dp->txd_cnt;
+
+	tx_ring->size = array_size(tx_ring->cnt, sizeof(*tx_ring->txds));
+	tx_ring->txds = dma_alloc_coherent(dp->dev, tx_ring->size,
+					   &tx_ring->dma,
+					   GFP_KERNEL | __GFP_NOWARN);
+	if (!tx_ring->txds) {
+		netdev_warn(dp->netdev, "failed to allocate TX descriptor ring memory, requested descriptor count: %d, consider lowering descriptor count\n",
+			    tx_ring->cnt);
+		goto err_alloc;
+	}
+
+	tx_ring->txbufs = kvcalloc(tx_ring->cnt, sizeof(*tx_ring->txbufs),
+				   GFP_KERNEL);
+	if (!tx_ring->txbufs)
+		goto err_alloc;
+
+	if (!tx_ring->is_xdp && dp->netdev)
+		netif_set_xps_queue(dp->netdev, &r_vec->affinity_mask,
+				    tx_ring->idx);
+
+	return 0;
+
+err_alloc:
+	nfp_nfd3_tx_ring_free(tx_ring);
+	return -ENOMEM;
+}
+
+static void
+nfp_nfd3_tx_ring_bufs_free(struct nfp_net_dp *dp,
+			   struct nfp_net_tx_ring *tx_ring)
+{
+	unsigned int i;
+
+	if (!tx_ring->is_xdp)
+		return;
+
+	for (i = 0; i < tx_ring->cnt; i++) {
+		if (!tx_ring->txbufs[i].frag)
+			return;
+
+		nfp_net_dma_unmap_rx(dp, tx_ring->txbufs[i].dma_addr);
+		__free_page(virt_to_page(tx_ring->txbufs[i].frag));
+	}
+}
+
+static int
+nfp_nfd3_tx_ring_bufs_alloc(struct nfp_net_dp *dp,
+			    struct nfp_net_tx_ring *tx_ring)
+{
+	struct nfp_nfd3_tx_buf *txbufs = tx_ring->txbufs;
+	unsigned int i;
+
+	if (!tx_ring->is_xdp)
+		return 0;
+
+	for (i = 0; i < tx_ring->cnt; i++) {
+		txbufs[i].frag = nfp_net_rx_alloc_one(dp, &txbufs[i].dma_addr);
+		if (!txbufs[i].frag) {
+			nfp_nfd3_tx_ring_bufs_free(dp, tx_ring);
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
+
+static void
+nfp_nfd3_print_tx_descs(struct seq_file *file,
+			struct nfp_net_r_vector *r_vec,
+			struct nfp_net_tx_ring *tx_ring,
+			u32 d_rd_p, u32 d_wr_p)
+{
+	struct nfp_nfd3_tx_desc *txd;
+	u32 txd_cnt = tx_ring->cnt;
+	int i;
+
+	for (i = 0; i < txd_cnt; i++) {
+		struct xdp_buff *xdp;
+		struct sk_buff *skb;
+
+		txd = &tx_ring->txds[i];
+		seq_printf(file, "%04d: 0x%08x 0x%08x 0x%08x 0x%08x", i,
+			   txd->vals[0], txd->vals[1],
+			   txd->vals[2], txd->vals[3]);
+
+		if (!tx_ring->is_xdp) {
+			skb = READ_ONCE(tx_ring->txbufs[i].skb);
+			if (skb)
+				seq_printf(file, " skb->head=%p skb->data=%p",
+					   skb->head, skb->data);
+		} else {
+			xdp = READ_ONCE(tx_ring->txbufs[i].xdp);
+			if (xdp)
+				seq_printf(file, " xdp->data=%p", xdp->data);
+		}
+
+		if (tx_ring->txbufs[i].dma_addr)
+			seq_printf(file, " dma_addr=%pad",
+				   &tx_ring->txbufs[i].dma_addr);
+
+		if (i == tx_ring->rd_p % txd_cnt)
+			seq_puts(file, " H_RD");
+		if (i == tx_ring->wr_p % txd_cnt)
+			seq_puts(file, " H_WR");
+		if (i == d_rd_p % txd_cnt)
+			seq_puts(file, " D_RD");
+		if (i == d_wr_p % txd_cnt)
+			seq_puts(file, " D_WR");
+
+		seq_putc(file, '\n');
+	}
+}
+
+#define NFP_NFD3_CFG_CTRL_SUPPORTED					\
+	(NFP_NET_CFG_CTRL_ENABLE | NFP_NET_CFG_CTRL_PROMISC |		\
+	 NFP_NET_CFG_CTRL_L2BC | NFP_NET_CFG_CTRL_L2MC |		\
+	 NFP_NET_CFG_CTRL_RXCSUM | NFP_NET_CFG_CTRL_TXCSUM |		\
+	 NFP_NET_CFG_CTRL_RXVLAN | NFP_NET_CFG_CTRL_TXVLAN |		\
+	 NFP_NET_CFG_CTRL_RXVLAN_V2 | NFP_NET_CFG_CTRL_RXQINQ |		\
+	 NFP_NET_CFG_CTRL_TXVLAN_V2 |					\
+	 NFP_NET_CFG_CTRL_GATHER | NFP_NET_CFG_CTRL_LSO |		\
+	 NFP_NET_CFG_CTRL_CTAG_FILTER | NFP_NET_CFG_CTRL_CMSG_DATA |	\
+	 NFP_NET_CFG_CTRL_RINGCFG | NFP_NET_CFG_CTRL_RSS |		\
+	 NFP_NET_CFG_CTRL_IRQMOD | NFP_NET_CFG_CTRL_TXRWB |		\
+	 NFP_NET_CFG_CTRL_VEPA |					\
+	 NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE |		\
+	 NFP_NET_CFG_CTRL_BPF | NFP_NET_CFG_CTRL_LSO2 |			\
+	 NFP_NET_CFG_CTRL_RSS2 | NFP_NET_CFG_CTRL_CSUM_COMPLETE |	\
+	 NFP_NET_CFG_CTRL_LIVE_ADDR)
+
+const struct nfp_dp_ops nfp_nfd3_ops = {
+	.version		= NFP_NFD_VER_NFD3,
+	.tx_min_desc_per_pkt	= 1,
+	.cap_mask		= NFP_NFD3_CFG_CTRL_SUPPORTED,
+	.dma_mask		= DMA_BIT_MASK(40),
+	.poll			= nfp_nfd3_poll,
+	.xsk_poll		= nfp_nfd3_xsk_poll,
+	.ctrl_poll		= nfp_nfd3_ctrl_poll,
+	.xmit			= nfp_nfd3_tx,
+	.ctrl_tx_one		= nfp_nfd3_ctrl_tx_one,
+	.rx_ring_fill_freelist	= nfp_nfd3_rx_ring_fill_freelist,
+	.tx_ring_alloc		= nfp_nfd3_tx_ring_alloc,
+	.tx_ring_reset		= nfp_nfd3_tx_ring_reset,
+	.tx_ring_free		= nfp_nfd3_tx_ring_free,
+	.tx_ring_bufs_alloc	= nfp_nfd3_tx_ring_bufs_alloc,
+	.tx_ring_bufs_free	= nfp_nfd3_tx_ring_bufs_free,
+	.print_tx_descs		= nfp_nfd3_print_tx_descs
+};