1 files changed, 408 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/ef100_tx.c b/drivers/net/ethernet/sfc/ef100_tx.c
new file mode 100644
index 000000000000..a09546e43408
--- /dev/null
+++ b/drivers/net/ethernet/sfc/ef100_tx.c
@@ -0,0 +1,408 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/****************************************************************************
+ * Driver for Solarflare network controllers and boards
+ * Copyright 2018 Solarflare Communications Inc.
+ * Copyright 2019-2020 Xilinx Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation, incorporated herein by reference.
+ */
+
+#include <net/ip6_checksum.h>
+
+#include "net_driver.h"
+#include "tx_common.h"
+#include "nic_common.h"
+#include "mcdi_functions.h"
+#include "ef100_regs.h"
+#include "io.h"
+#include "ef100_tx.h"
+#include "ef100_nic.h"
+
+int ef100_tx_probe(struct efx_tx_queue *tx_queue)
+{
+	/* Allocate an extra descriptor for the QMDA status completion entry */
+	return efx_nic_alloc_buffer(tx_queue->efx, &tx_queue->txd.buf,
+				    (tx_queue->ptr_mask + 2) *
+				    sizeof(efx_oword_t),
+				    GFP_KERNEL);
+	return 0;
+}
+
+void ef100_tx_init(struct efx_tx_queue *tx_queue)
+{
+	/* must be the inverse of lookup in efx_get_tx_channel */
+	tx_queue->core_txq =
+		netdev_get_tx_queue(tx_queue->efx->net_dev,
+				    tx_queue->channel->channel -
+				    tx_queue->efx->tx_channel_offset);
+
+	if (efx_mcdi_tx_init(tx_queue, false))
+		netdev_WARN(tx_queue->efx->net_dev,
+			    "failed to initialise TXQ %d\n", tx_queue->queue);
+}
+
+static bool ef100_tx_can_tso(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
+{
+	struct efx_nic *efx = tx_queue->efx;
+	struct ef100_nic_data *nic_data;
+	struct efx_tx_buffer *buffer;
+	struct tcphdr *tcphdr;
+	struct iphdr *iphdr;
+	size_t header_len;
+	u32 mss;
+
+	nic_data = efx->nic_data;
+
+	if (!skb_is_gso_tcp(skb))
+		return false;
+	if (!(efx->net_dev->features & NETIF_F_TSO))
+		return false;
+
+	mss = skb_shinfo(skb)->gso_size;
+	if (unlikely(mss < 4)) {
+		WARN_ONCE(1, "MSS of %u is too small for TSO\n", mss);
+		return false;
+	}
+
+	header_len = efx_tx_tso_header_length(skb);
+	if (header_len > nic_data->tso_max_hdr_len)
+		return false;
+
+	if (skb_shinfo(skb)->gso_segs > nic_data->tso_max_payload_num_segs) {
+		/* net_dev->gso_max_segs should've caught this */
+		WARN_ON_ONCE(1);
+		return false;
+	}
+
+	if (skb->data_len / mss > nic_data->tso_max_frames)
+		return false;
+
+	/* net_dev->gso_max_size should've caught this */
+	if (WARN_ON_ONCE(skb->data_len > nic_data->tso_max_payload_len))
+		return false;
+
+	/* Reserve an empty buffer for the TSO V3 descriptor.
+	 * Convey the length of the header since we already know it.
+	 */
+	buffer = efx_tx_queue_get_insert_buffer(tx_queue);
+	buffer->flags = EFX_TX_BUF_TSO_V3 | EFX_TX_BUF_CONT;
+	buffer->len = header_len;
+	buffer->unmap_len = 0;
+	buffer->skb = skb;
+	++tx_queue->insert_count;
+
+	/* Adjust the TCP checksum to exclude the total length, since we set
+	 * ED_INNER_IP_LEN in the descriptor.
+	 */
+	tcphdr = tcp_hdr(skb);
+	if (skb_is_gso_v6(skb)) {
+		tcphdr->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+						 &ipv6_hdr(skb)->daddr,
+						 0, IPPROTO_TCP, 0);
+	} else {
+		iphdr = ip_hdr(skb);
+		tcphdr->check = ~csum_tcpudp_magic(iphdr->saddr, iphdr->daddr,
+						   0, IPPROTO_TCP, 0);
+	}
+	return true;
+}
+
+static efx_oword_t *ef100_tx_desc(struct efx_tx_queue *tx_queue, unsigned int index)
+{
+	if (likely(tx_queue->txd.buf.addr))
+		return ((efx_oword_t *)tx_queue->txd.buf.addr) + index;
+	else
+		return NULL;
+}
+
+void ef100_notify_tx_desc(struct efx_tx_queue *tx_queue)
+{
+	unsigned int write_ptr;
+	efx_dword_t reg;
+
+	if (unlikely(tx_queue->notify_count == tx_queue->write_count))
+		return;
+
+	write_ptr = tx_queue->write_count & tx_queue->ptr_mask;
+	/* The write pointer goes into the high word */
+	EFX_POPULATE_DWORD_1(reg, ERF_GZ_TX_RING_PIDX, write_ptr);
+	efx_writed_page(tx_queue->efx, &reg,
+			ER_GZ_TX_RING_DOORBELL, tx_queue->queue);
+	tx_queue->notify_count = tx_queue->write_count;
+	tx_queue->xmit_more_available = false;
+}
+
+static void ef100_tx_push_buffers(struct efx_tx_queue *tx_queue)
+{
+	ef100_notify_tx_desc(tx_queue);
+	++tx_queue->pushes;
+}
+
+static void ef100_set_tx_csum_partial(const struct sk_buff *skb,
+				      struct efx_tx_buffer *buffer, efx_oword_t *txd)
+{
+	efx_oword_t csum;
+	int csum_start;
+
+	if (!skb || skb->ip_summed != CHECKSUM_PARTIAL)
+		return;
+
+	/* skb->csum_start has the offset from head, but we need the offset
+	 * from data.
+	 */
+	csum_start = skb_checksum_start_offset(skb);
+	EFX_POPULATE_OWORD_3(csum,
+			     ESF_GZ_TX_SEND_CSO_PARTIAL_EN, 1,
+			     ESF_GZ_TX_SEND_CSO_PARTIAL_START_W,
+			     csum_start >> 1,
+			     ESF_GZ_TX_SEND_CSO_PARTIAL_CSUM_W,
+			     skb->csum_offset >> 1);
+	EFX_OR_OWORD(*txd, *txd, csum);
+}
+
+static void ef100_set_tx_hw_vlan(const struct sk_buff *skb, efx_oword_t *txd)
+{
+	u16 vlan_tci = skb_vlan_tag_get(skb);
+	efx_oword_t vlan;
+
+	EFX_POPULATE_OWORD_2(vlan,
+			     ESF_GZ_TX_SEND_VLAN_INSERT_EN, 1,
+			     ESF_GZ_TX_SEND_VLAN_INSERT_TCI, vlan_tci);
+	EFX_OR_OWORD(*txd, *txd, vlan);
+}
+
+static void ef100_make_send_desc(struct efx_nic *efx,
+				 const struct sk_buff *skb,
+				 struct efx_tx_buffer *buffer, efx_oword_t *txd,
+				 unsigned int segment_count)
+{
+	/* TX send descriptor */
+	EFX_POPULATE_OWORD_3(*txd,
+			     ESF_GZ_TX_SEND_NUM_SEGS, segment_count,
+			     ESF_GZ_TX_SEND_LEN, buffer->len,
+			     ESF_GZ_TX_SEND_ADDR, buffer->dma_addr);
+
+	if (likely(efx->net_dev->features & NETIF_F_HW_CSUM))
+		ef100_set_tx_csum_partial(skb, buffer, txd);
+	if (efx->net_dev->features & NETIF_F_HW_VLAN_CTAG_TX &&
+	    skb && skb_vlan_tag_present(skb))
+		ef100_set_tx_hw_vlan(skb, txd);
+}
+
+static void ef100_make_tso_desc(struct efx_nic *efx,
+				const struct sk_buff *skb,
+				struct efx_tx_buffer *buffer, efx_oword_t *txd,
+				unsigned int segment_count)
+{
+	u32 mangleid = (efx->net_dev->features & NETIF_F_TSO_MANGLEID) ||
+		skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID ?
+		ESE_GZ_TX_DESC_IP4_ID_NO_OP :
+		ESE_GZ_TX_DESC_IP4_ID_INC_MOD16;
+	u16 vlan_enable =  efx->net_dev->features & NETIF_F_HW_VLAN_CTAG_TX ?
+		skb_vlan_tag_present(skb) : 0;
+	unsigned int len, ip_offset, tcp_offset, payload_segs;
+	u16 vlan_tci = skb_vlan_tag_get(skb);
+	u32 mss = skb_shinfo(skb)->gso_size;
+
+	len = skb->len - buffer->len;
+	/* We use 1 for the TSO descriptor and 1 for the header */
+	payload_segs = segment_count - 2;
+	ip_offset =  skb_network_offset(skb);
+	tcp_offset = skb_transport_offset(skb);
+
+	EFX_POPULATE_OWORD_13(*txd,
+			      ESF_GZ_TX_DESC_TYPE, ESE_GZ_TX_DESC_TYPE_TSO,
+			      ESF_GZ_TX_TSO_MSS, mss,
+			      ESF_GZ_TX_TSO_HDR_NUM_SEGS, 1,
+			      ESF_GZ_TX_TSO_PAYLOAD_NUM_SEGS, payload_segs,
+			      ESF_GZ_TX_TSO_HDR_LEN_W, buffer->len >> 1,
+			      ESF_GZ_TX_TSO_PAYLOAD_LEN, len,
+			      ESF_GZ_TX_TSO_CSO_INNER_L4, 1,
+			      ESF_GZ_TX_TSO_INNER_L3_OFF_W, ip_offset >> 1,
+			      ESF_GZ_TX_TSO_INNER_L4_OFF_W, tcp_offset >> 1,
+			      ESF_GZ_TX_TSO_ED_INNER_IP4_ID, mangleid,
+			      ESF_GZ_TX_TSO_ED_INNER_IP_LEN, 1,
+			      ESF_GZ_TX_TSO_VLAN_INSERT_EN, vlan_enable,
+			      ESF_GZ_TX_TSO_VLAN_INSERT_TCI, vlan_tci
+		);
+}
+
+static void ef100_tx_make_descriptors(struct efx_tx_queue *tx_queue,
+				      const struct sk_buff *skb,
+				      unsigned int segment_count)
+{
+	unsigned int old_write_count = tx_queue->write_count;
+	unsigned int new_write_count = old_write_count;
+	struct efx_tx_buffer *buffer;
+	unsigned int next_desc_type;
+	unsigned int write_ptr;
+	efx_oword_t *txd;
+	unsigned int nr_descs = tx_queue->insert_count - old_write_count;
+
+	if (unlikely(nr_descs == 0))
+		return;
+
+	if (segment_count)
+		next_desc_type = ESE_GZ_TX_DESC_TYPE_TSO;
+	else
+		next_desc_type = ESE_GZ_TX_DESC_TYPE_SEND;
+
+	/* if it's a raw write (such as XDP) then always SEND single frames */
+	if (!skb)
+		nr_descs = 1;
+
+	do {
+		write_ptr = new_write_count & tx_queue->ptr_mask;
+		buffer = &tx_queue->buffer[write_ptr];
+		txd = ef100_tx_desc(tx_queue, write_ptr);
+		++new_write_count;
+
+		/* Create TX descriptor ring entry */
+		tx_queue->packet_write_count = new_write_count;
+
+		switch (next_desc_type) {
+		case ESE_GZ_TX_DESC_TYPE_SEND:
+			ef100_make_send_desc(tx_queue->efx, skb,
+					     buffer, txd, nr_descs);
+			break;
+		case ESE_GZ_TX_DESC_TYPE_TSO:
+			/* TX TSO descriptor */
+			WARN_ON_ONCE(!(buffer->flags & EFX_TX_BUF_TSO_V3));
+			ef100_make_tso_desc(tx_queue->efx, skb,
+					    buffer, txd, nr_descs);
+			break;
+		default:
+			/* TX segment descriptor */
+			EFX_POPULATE_OWORD_3(*txd,
+					     ESF_GZ_TX_DESC_TYPE, ESE_GZ_TX_DESC_TYPE_SEG,
+					     ESF_GZ_TX_SEG_LEN, buffer->len,
+					     ESF_GZ_TX_SEG_ADDR, buffer->dma_addr);
+		}
+		/* if it's a raw write (such as XDP) then always SEND */
+		next_desc_type = skb ? ESE_GZ_TX_DESC_TYPE_SEG :
+				       ESE_GZ_TX_DESC_TYPE_SEND;
+
+	} while (new_write_count != tx_queue->insert_count);
+
+	wmb(); /* Ensure descriptors are written before they are fetched */
+
+	tx_queue->write_count = new_write_count;
+
+	/* The write_count above must be updated before reading
+	 * channel->holdoff_doorbell to avoid a race with the
+	 * completion path, so ensure these operations are not
+	 * re-ordered.  This also flushes the update of write_count
+	 * back into the cache.
+	 */
+	smp_mb();
+}
+
+void ef100_tx_write(struct efx_tx_queue *tx_queue)
+{
+	ef100_tx_make_descriptors(tx_queue, NULL, 0);
+	ef100_tx_push_buffers(tx_queue);
+}
+
+void ef100_ev_tx(struct efx_channel *channel, const efx_qword_t *p_event)
+{
+	unsigned int tx_done =
+		EFX_QWORD_FIELD(*p_event, ESF_GZ_EV_TXCMPL_NUM_DESC);
+	unsigned int qlabel =
+		EFX_QWORD_FIELD(*p_event, ESF_GZ_EV_TXCMPL_Q_LABEL);
+	struct efx_tx_queue *tx_queue =
+		efx_channel_get_tx_queue(channel, qlabel);
+	unsigned int tx_index = (tx_queue->read_count + tx_done - 1) &
+				tx_queue->ptr_mask;
+
+	efx_xmit_done(tx_queue, tx_index);
+}
+
+/* Add a socket buffer to a TX queue
+ *
+ * You must hold netif_tx_lock() to call this function.
+ *
+ * Returns 0 on success, error code otherwise. In case of an error this
+ * function will free the SKB.
+ */
+int ef100_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
+{
+	unsigned int old_insert_count = tx_queue->insert_count;
+	struct efx_nic *efx = tx_queue->efx;
+	bool xmit_more = netdev_xmit_more();
+	unsigned int fill_level;
+	unsigned int segments;
+	int rc;
+
+	if (!tx_queue->buffer || !tx_queue->ptr_mask) {
+		netif_stop_queue(efx->net_dev);
+		dev_kfree_skb_any(skb);
+		return -ENODEV;
+	}
+
+	segments = skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 0;
+	if (segments == 1)
+		segments = 0;	/* Don't use TSO/GSO for a single segment. */
+	if (segments && !ef100_tx_can_tso(tx_queue, skb)) {
+		rc = efx_tx_tso_fallback(tx_queue, skb);
+		tx_queue->tso_fallbacks++;
+		if (rc)
+			goto err;
+		else
+			return 0;
+	}
+
+	/* Map for DMA and create descriptors */
+	rc = efx_tx_map_data(tx_queue, skb, segments);
+	if (rc)
+		goto err;
+	ef100_tx_make_descriptors(tx_queue, skb, segments);
+
+	fill_level = efx_channel_tx_fill_level(tx_queue->channel);
+	if (fill_level > efx->txq_stop_thresh) {
+		netif_tx_stop_queue(tx_queue->core_txq);
+		/* Re-read after a memory barrier in case we've raced with
+		 * the completion path. Otherwise there's a danger we'll never
+		 * restart the queue if all completions have just happened.
+		 */
+		smp_mb();
+		fill_level = efx_channel_tx_fill_level(tx_queue->channel);
+		if (fill_level < efx->txq_stop_thresh)
+			netif_tx_start_queue(tx_queue->core_txq);
+	}
+
+	if (__netdev_tx_sent_queue(tx_queue->core_txq, skb->len, xmit_more))
+		tx_queue->xmit_more_available = false; /* push doorbell */
+	else if (tx_queue->write_count - tx_queue->notify_count > 255)
+		/* Ensure we never push more than 256 packets at once */
+		tx_queue->xmit_more_available = false; /* push */
+	else
+		tx_queue->xmit_more_available = true; /* don't push yet */
+
+	if (!tx_queue->xmit_more_available)
+		ef100_tx_push_buffers(tx_queue);
+
+	if (segments) {
+		tx_queue->tso_bursts++;
+		tx_queue->tso_packets += segments;
+		tx_queue->tx_packets  += segments;
+	} else {
+		tx_queue->tx_packets++;
+	}
+	return 0;
+
+err:
+	efx_enqueue_unwind(tx_queue, old_insert_count);
+	if (!IS_ERR_OR_NULL(skb))
+		dev_kfree_skb_any(skb);
+
+	/* If we're not expecting another transmit and we had something to push
+	 * on this queue then we need to push here to get the previous packets
+	 * out.  We only enter this branch from before the 'Update BQL' section
+	 * above, so xmit_more_available still refers to the old state.
+	 */
+	if (tx_queue->xmit_more_available && !xmit_more)
+		ef100_tx_push_buffers(tx_queue);
+	return rc;
+}