1 files changed, 0 insertions, 538 deletions

diff --git a/drivers/staging/octeon/ethernet-rx.c b/drivers/staging/octeon/ethernet-rx.c
deleted file mode 100644
index 2c16230f993c..000000000000
--- a/drivers/staging/octeon/ethernet-rx.c
+++ /dev/null
@@ -1,538 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * This file is based on code from OCTEON SDK by Cavium Networks.
- *
- * Copyright (c) 2003-2010 Cavium Networks
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/cache.h>
-#include <linux/cpumask.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/ip.h>
-#include <linux/string.h>
-#include <linux/prefetch.h>
-#include <linux/ratelimit.h>
-#include <linux/smp.h>
-#include <linux/interrupt.h>
-#include <net/dst.h>
-#ifdef CONFIG_XFRM
-#include <linux/xfrm.h>
-#include <net/xfrm.h>
-#endif /* CONFIG_XFRM */
-
-#include "octeon-ethernet.h"
-#include "ethernet-defines.h"
-#include "ethernet-mem.h"
-#include "ethernet-rx.h"
-#include "ethernet-util.h"
-
-static atomic_t oct_rx_ready = ATOMIC_INIT(0);
-
-static struct oct_rx_group {
-	int irq;
-	int group;
-	struct napi_struct napi;
-} oct_rx_group[16];
-
-/**
- * cvm_oct_do_interrupt - interrupt handler.
- * @irq: Interrupt number.
- * @napi_id: Cookie to identify the NAPI instance.
- *
- * The interrupt occurs whenever the POW has packets in our group.
- *
- */
-static irqreturn_t cvm_oct_do_interrupt(int irq, void *napi_id)
-{
-	/* Disable the IRQ and start napi_poll. */
-	disable_irq_nosync(irq);
-	napi_schedule(napi_id);
-
-	return IRQ_HANDLED;
-}
-
-/**
- * cvm_oct_check_rcv_error - process receive errors
- * @work: Work queue entry pointing to the packet.
- *
- * Returns Non-zero if the packet can be dropped, zero otherwise.
- */
-static inline int cvm_oct_check_rcv_error(struct cvmx_wqe *work)
-{
-	int port;
-
-	if (octeon_has_feature(OCTEON_FEATURE_PKND))
-		port = work->word0.pip.cn68xx.pknd;
-	else
-		port = work->word1.cn38xx.ipprt;
-
-	if ((work->word2.snoip.err_code == 10) && (work->word1.len <= 64)) {
-		/*
-		 * Ignore length errors on min size packets. Some
-		 * equipment incorrectly pads packets to 64+4FCS
-		 * instead of 60+4FCS.  Note these packets still get
-		 * counted as frame errors.
-		 */
-	} else if (work->word2.snoip.err_code == 5 ||
-		   work->word2.snoip.err_code == 7) {
-		/*
-		 * We received a packet with either an alignment error
-		 * or a FCS error. This may be signalling that we are
-		 * running 10Mbps with GMXX_RXX_FRM_CTL[PRE_CHK]
-		 * off. If this is the case we need to parse the
-		 * packet to determine if we can remove a non spec
-		 * preamble and generate a correct packet.
-		 */
-		int interface = cvmx_helper_get_interface_num(port);
-		int index = cvmx_helper_get_interface_index_num(port);
-		union cvmx_gmxx_rxx_frm_ctl gmxx_rxx_frm_ctl;
-
-		gmxx_rxx_frm_ctl.u64 =
-		    cvmx_read_csr(CVMX_GMXX_RXX_FRM_CTL(index, interface));
-		if (gmxx_rxx_frm_ctl.s.pre_chk == 0) {
-			u8 *ptr =
-			    cvmx_phys_to_ptr(work->packet_ptr.s.addr);
-			int i = 0;
-
-			while (i < work->word1.len - 1) {
-				if (*ptr != 0x55)
-					break;
-				ptr++;
-				i++;
-			}
-
-			if (*ptr == 0xd5) {
-				/* Port received 0xd5 preamble */
-				work->packet_ptr.s.addr += i + 1;
-				work->word1.len -= i + 5;
-			} else if ((*ptr & 0xf) == 0xd) {
-				/* Port received 0xd preamble */
-				work->packet_ptr.s.addr += i;
-				work->word1.len -= i + 4;
-				for (i = 0; i < work->word1.len; i++) {
-					*ptr =
-					    ((*ptr & 0xf0) >> 4) |
-					    ((*(ptr + 1) & 0xf) << 4);
-					ptr++;
-				}
-			} else {
-				printk_ratelimited("Port %d unknown preamble, packet dropped\n",
-						   port);
-				cvm_oct_free_work(work);
-				return 1;
-			}
-		}
-	} else {
-		printk_ratelimited("Port %d receive error code %d, packet dropped\n",
-				   port, work->word2.snoip.err_code);
-		cvm_oct_free_work(work);
-		return 1;
-	}
-
-	return 0;
-}
-
-static void copy_segments_to_skb(struct cvmx_wqe *work, struct sk_buff *skb)
-{
-	int segments = work->word2.s.bufs;
-	union cvmx_buf_ptr segment_ptr = work->packet_ptr;
-	int len = work->word1.len;
-	int segment_size;
-
-	while (segments--) {
-		union cvmx_buf_ptr next_ptr;
-
-		next_ptr = *(union cvmx_buf_ptr *)
-			cvmx_phys_to_ptr(segment_ptr.s.addr - 8);
-
-		/*
-		 * Octeon Errata PKI-100: The segment size is wrong.
-		 *
-		 * Until it is fixed, calculate the segment size based on
-		 * the packet pool buffer size.
-		 * When it is fixed, the following line should be replaced
-		 * with this one:
-		 * int segment_size = segment_ptr.s.size;
-		 */
-		segment_size =
-			CVMX_FPA_PACKET_POOL_SIZE -
-			(segment_ptr.s.addr -
-			 (((segment_ptr.s.addr >> 7) -
-			   segment_ptr.s.back) << 7));
-
-		/* Don't copy more than what is left in the packet */
-		if (segment_size > len)
-			segment_size = len;
-
-		/* Copy the data into the packet */
-		skb_put_data(skb, cvmx_phys_to_ptr(segment_ptr.s.addr),
-			     segment_size);
-		len -= segment_size;
-		segment_ptr = next_ptr;
-	}
-}
-
-static int cvm_oct_poll(struct oct_rx_group *rx_group, int budget)
-{
-	const int	coreid = cvmx_get_core_num();
-	u64	old_group_mask;
-	u64	old_scratch;
-	int		rx_count = 0;
-	int		did_work_request = 0;
-	int		packet_not_copied;
-
-	/* Prefetch cvm_oct_device since we know we need it soon */
-	prefetch(cvm_oct_device);
-
-	if (USE_ASYNC_IOBDMA) {
-		/* Save scratch in case userspace is using it */
-		CVMX_SYNCIOBDMA;
-		old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
-	}
-
-	/* Only allow work for our group (and preserve priorities) */
-	if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
-		old_group_mask = cvmx_read_csr(CVMX_SSO_PPX_GRP_MSK(coreid));
-		cvmx_write_csr(CVMX_SSO_PPX_GRP_MSK(coreid),
-			       BIT(rx_group->group));
-		cvmx_read_csr(CVMX_SSO_PPX_GRP_MSK(coreid)); /* Flush */
-	} else {
-		old_group_mask = cvmx_read_csr(CVMX_POW_PP_GRP_MSKX(coreid));
-		cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(coreid),
-			       (old_group_mask & ~0xFFFFull) |
-			       BIT(rx_group->group));
-	}
-
-	if (USE_ASYNC_IOBDMA) {
-		cvmx_pow_work_request_async(CVMX_SCR_SCRATCH, CVMX_POW_NO_WAIT);
-		did_work_request = 1;
-	}
-
-	while (rx_count < budget) {
-		struct sk_buff *skb = NULL;
-		struct sk_buff **pskb = NULL;
-		int skb_in_hw;
-		struct cvmx_wqe *work;
-		int port;
-
-		if (USE_ASYNC_IOBDMA && did_work_request)
-			work = cvmx_pow_work_response_async(CVMX_SCR_SCRATCH);
-		else
-			work = cvmx_pow_work_request_sync(CVMX_POW_NO_WAIT);
-
-		prefetch(work);
-		did_work_request = 0;
-		if (!work) {
-			if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
-				cvmx_write_csr(CVMX_SSO_WQ_IQ_DIS,
-					       BIT(rx_group->group));
-				cvmx_write_csr(CVMX_SSO_WQ_INT,
-					       BIT(rx_group->group));
-			} else {
-				union cvmx_pow_wq_int wq_int;
-
-				wq_int.u64 = 0;
-				wq_int.s.iq_dis = BIT(rx_group->group);
-				wq_int.s.wq_int = BIT(rx_group->group);
-				cvmx_write_csr(CVMX_POW_WQ_INT, wq_int.u64);
-			}
-			break;
-		}
-		pskb = (struct sk_buff **)
-			(cvm_oct_get_buffer_ptr(work->packet_ptr) -
-			sizeof(void *));
-		prefetch(pskb);
-
-		if (USE_ASYNC_IOBDMA && rx_count < (budget - 1)) {
-			cvmx_pow_work_request_async_nocheck(CVMX_SCR_SCRATCH,
-							    CVMX_POW_NO_WAIT);
-			did_work_request = 1;
-		}
-		rx_count++;
-
-		skb_in_hw = work->word2.s.bufs == 1;
-		if (likely(skb_in_hw)) {
-			skb = *pskb;
-			prefetch(&skb->head);
-			prefetch(&skb->len);
-		}
-
-		if (octeon_has_feature(OCTEON_FEATURE_PKND))
-			port = work->word0.pip.cn68xx.pknd;
-		else
-			port = work->word1.cn38xx.ipprt;
-
-		prefetch(cvm_oct_device[port]);
-
-		/* Immediately throw away all packets with receive errors */
-		if (unlikely(work->word2.snoip.rcv_error)) {
-			if (cvm_oct_check_rcv_error(work))
-				continue;
-		}
-
-		/*
-		 * We can only use the zero copy path if skbuffs are
-		 * in the FPA pool and the packet fits in a single
-		 * buffer.
-		 */
-		if (likely(skb_in_hw)) {
-			skb->data = skb->head + work->packet_ptr.s.addr -
-				cvmx_ptr_to_phys(skb->head);
-			prefetch(skb->data);
-			skb->len = work->word1.len;
-			skb_set_tail_pointer(skb, skb->len);
-			packet_not_copied = 1;
-		} else {
-			/*
-			 * We have to copy the packet. First allocate
-			 * an skbuff for it.
-			 */
-			skb = dev_alloc_skb(work->word1.len);
-			if (!skb) {
-				cvm_oct_free_work(work);
-				continue;
-			}
-
-			/*
-			 * Check if we've received a packet that was
-			 * entirely stored in the work entry.
-			 */
-			if (unlikely(work->word2.s.bufs == 0)) {
-				u8 *ptr = work->packet_data;
-
-				if (likely(!work->word2.s.not_IP)) {
-					/*
-					 * The beginning of the packet
-					 * moves for IP packets.
-					 */
-					if (work->word2.s.is_v6)
-						ptr += 2;
-					else
-						ptr += 6;
-				}
-				skb_put_data(skb, ptr, work->word1.len);
-				/* No packet buffers to free */
-			} else {
-				copy_segments_to_skb(work, skb);
-			}
-			packet_not_copied = 0;
-		}
-		if (likely((port < TOTAL_NUMBER_OF_PORTS) &&
-			   cvm_oct_device[port])) {
-			struct net_device *dev = cvm_oct_device[port];
-
-			/*
-			 * Only accept packets for devices that are
-			 * currently up.
-			 */
-			if (likely(dev->flags & IFF_UP)) {
-				skb->protocol = eth_type_trans(skb, dev);
-				skb->dev = dev;
-
-				if (unlikely(work->word2.s.not_IP ||
-					     work->word2.s.IP_exc ||
-					     work->word2.s.L4_error ||
-					     !work->word2.s.tcp_or_udp))
-					skb->ip_summed = CHECKSUM_NONE;
-				else
-					skb->ip_summed = CHECKSUM_UNNECESSARY;
-
-				/* Increment RX stats for virtual ports */
-				if (port >= CVMX_PIP_NUM_INPUT_PORTS) {
-					dev->stats.rx_packets++;
-					dev->stats.rx_bytes += skb->len;
-				}
-				netif_receive_skb(skb);
-			} else {
-				/*
-				 * Drop any packet received for a device that
-				 * isn't up.
-				 */
-				dev->stats.rx_dropped++;
-				dev_kfree_skb_irq(skb);
-			}
-		} else {
-			/*
-			 * Drop any packet received for a device that
-			 * doesn't exist.
-			 */
-			printk_ratelimited("Port %d not controlled by Linux, packet dropped\n",
-					   port);
-			dev_kfree_skb_irq(skb);
-		}
-		/*
-		 * Check to see if the skbuff and work share the same
-		 * packet buffer.
-		 */
-		if (likely(packet_not_copied)) {
-			/*
-			 * This buffer needs to be replaced, increment
-			 * the number of buffers we need to free by
-			 * one.
-			 */
-			cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
-					      1);
-
-			cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
-		} else {
-			cvm_oct_free_work(work);
-		}
-	}
-	/* Restore the original POW group mask */
-	if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
-		cvmx_write_csr(CVMX_SSO_PPX_GRP_MSK(coreid), old_group_mask);
-		cvmx_read_csr(CVMX_SSO_PPX_GRP_MSK(coreid)); /* Flush */
-	} else {
-		cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(coreid), old_group_mask);
-	}
-
-	if (USE_ASYNC_IOBDMA) {
-		/* Restore the scratch area */
-		cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
-	}
-	cvm_oct_rx_refill_pool(0);
-
-	return rx_count;
-}
-
-/**
- * cvm_oct_napi_poll - the NAPI poll function.
- * @napi: The NAPI instance.
- * @budget: Maximum number of packets to receive.
- *
- * Returns the number of packets processed.
- */
-static int cvm_oct_napi_poll(struct napi_struct *napi, int budget)
-{
-	struct oct_rx_group *rx_group = container_of(napi, struct oct_rx_group,
-						     napi);
-	int rx_count;
-
-	rx_count = cvm_oct_poll(rx_group, budget);
-
-	if (rx_count < budget) {
-		/* No more work */
-		napi_complete_done(napi, rx_count);
-		enable_irq(rx_group->irq);
-	}
-	return rx_count;
-}
-
-#ifdef CONFIG_NET_POLL_CONTROLLER
-/**
- * cvm_oct_poll_controller - poll for receive packets
- * device.
- *
- * @dev:    Device to poll. Unused
- */
-void cvm_oct_poll_controller(struct net_device *dev)
-{
-	int i;
-
-	if (!atomic_read(&oct_rx_ready))
-		return;
-
-	for (i = 0; i < ARRAY_SIZE(oct_rx_group); i++) {
-		if (!(pow_receive_groups & BIT(i)))
-			continue;
-
-		cvm_oct_poll(&oct_rx_group[i], 16);
-	}
-}
-#endif
-
-void cvm_oct_rx_initialize(void)
-{
-	int i;
-	struct net_device *dev_for_napi = NULL;
-
-	for (i = 0; i < TOTAL_NUMBER_OF_PORTS; i++) {
-		if (cvm_oct_device[i]) {
-			dev_for_napi = cvm_oct_device[i];
-			break;
-		}
-	}
-
-	if (!dev_for_napi)
-		panic("No net_devices were allocated.");
-
-	for (i = 0; i < ARRAY_SIZE(oct_rx_group); i++) {
-		int ret;
-
-		if (!(pow_receive_groups & BIT(i)))
-			continue;
-
-		netif_napi_add(dev_for_napi, &oct_rx_group[i].napi,
-			       cvm_oct_napi_poll, rx_napi_weight);
-		napi_enable(&oct_rx_group[i].napi);
-
-		oct_rx_group[i].irq = OCTEON_IRQ_WORKQ0 + i;
-		oct_rx_group[i].group = i;
-
-		/* Register an IRQ handler to receive POW interrupts */
-		ret = request_irq(oct_rx_group[i].irq, cvm_oct_do_interrupt, 0,
-				  "Ethernet", &oct_rx_group[i].napi);
-		if (ret)
-			panic("Could not acquire Ethernet IRQ %d\n",
-			      oct_rx_group[i].irq);
-
-		disable_irq_nosync(oct_rx_group[i].irq);
-
-		/* Enable POW interrupt when our port has at least one packet */
-		if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
-			union cvmx_sso_wq_int_thrx int_thr;
-			union cvmx_pow_wq_int_pc int_pc;
-
-			int_thr.u64 = 0;
-			int_thr.s.tc_en = 1;
-			int_thr.s.tc_thr = 1;
-			cvmx_write_csr(CVMX_SSO_WQ_INT_THRX(i), int_thr.u64);
-
-			int_pc.u64 = 0;
-			int_pc.s.pc_thr = 5;
-			cvmx_write_csr(CVMX_SSO_WQ_INT_PC, int_pc.u64);
-		} else {
-			union cvmx_pow_wq_int_thrx int_thr;
-			union cvmx_pow_wq_int_pc int_pc;
-
-			int_thr.u64 = 0;
-			int_thr.s.tc_en = 1;
-			int_thr.s.tc_thr = 1;
-			cvmx_write_csr(CVMX_POW_WQ_INT_THRX(i), int_thr.u64);
-
-			int_pc.u64 = 0;
-			int_pc.s.pc_thr = 5;
-			cvmx_write_csr(CVMX_POW_WQ_INT_PC, int_pc.u64);
-		}
-
-		/* Schedule NAPI now. This will indirectly enable the
-		 * interrupt.
-		 */
-		napi_schedule(&oct_rx_group[i].napi);
-	}
-	atomic_inc(&oct_rx_ready);
-}
-
-void cvm_oct_rx_shutdown(void)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(oct_rx_group); i++) {
-		if (!(pow_receive_groups & BIT(i)))
-			continue;
-
-		/* Disable POW interrupt */
-		if (OCTEON_IS_MODEL(OCTEON_CN68XX))
-			cvmx_write_csr(CVMX_SSO_WQ_INT_THRX(i), 0);
-		else
-			cvmx_write_csr(CVMX_POW_WQ_INT_THRX(i), 0);
-
-		/* Free the interrupt handler */
-		free_irq(oct_rx_group[i].irq, cvm_oct_device);
-
-		netif_napi_del(&oct_rx_group[i].napi);
-	}
-}