--- /dev/null
+/**********************************************************************
+ * Author: Cavium Networks
+ *
+ * Contact: support@caviumnetworks.com
+ * This file is part of the OCTEON SDK
+ *
+ * Copyright (c) 2003-2010 Cavium Networks
+ *
+ * This file 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.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ * NONINFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * or visit http://www.gnu.org/licenses/.
+ *
+ * This file may also be available under a different license from Cavium.
+ * Contact Cavium Networks for more information
+**********************************************************************/
+#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 <linux/atomic.h>
+
+#include <asm/octeon/octeon.h>
+
+#include "ethernet-defines.h"
+#include "ethernet-mem.h"
+#include "ethernet-rx.h"
+#include "octeon-ethernet.h"
+#include "ethernet-util.h"
+
+#include <asm/octeon/cvmx-helper.h>
+#include <asm/octeon/cvmx-wqe.h>
+#include <asm/octeon/cvmx-fau.h>
+#include <asm/octeon/cvmx-pow.h>
+#include <asm/octeon/cvmx-pip.h>
+#include <asm/octeon/cvmx-scratch.h>
+
+#include <asm/octeon/cvmx-gmxx-defs.h>
+
+static struct napi_struct cvm_oct_napi;
+
+/**
+ * cvm_oct_do_interrupt - interrupt handler.
+ *
+ * The interrupt occurs whenever the POW has packets in our group.
+ *
+ */
+static irqreturn_t cvm_oct_do_interrupt(int cpl, void *dev_id)
+{
+ /* Disable the IRQ and start napi_poll. */
+ disable_irq_nosync(OCTEON_IRQ_WORKQ0 + pow_receive_group);
+ napi_schedule(&cvm_oct_napi);
+
+ 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(cvmx_wqe_t *work)
+{
+ if ((work->word2.snoip.err_code == 10) && (work->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 (USE_10MBPS_PREAMBLE_WORKAROUND
+ && ((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(work->ipprt);
+ int index = cvmx_helper_get_interface_index_num(work->ipprt);
+ 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) {
+
+ uint8_t *ptr =
+ cvmx_phys_to_ptr(work->packet_ptr.s.addr);
+ int i = 0;
+
+ while (i < work->len - 1) {
+ if (*ptr != 0x55)
+ break;
+ ptr++;
+ i++;
+ }
+
+ if (*ptr == 0xd5) {
+ /*
+ printk_ratelimited("Port %d received 0xd5 preamble\n",
+ work->ipprt);
+ */
+ work->packet_ptr.s.addr += i + 1;
+ work->len -= i + 5;
+ } else if ((*ptr & 0xf) == 0xd) {
+ /*
+ printk_ratelimited("Port %d received 0x?d preamble\n",
+ work->ipprt);
+ */
+ work->packet_ptr.s.addr += i;
+ work->len -= i + 4;
+ for (i = 0; i < work->len; i++) {
+ *ptr =
+ ((*ptr & 0xf0) >> 4) |
+ ((*(ptr + 1) & 0xf) << 4);
+ ptr++;
+ }
+ } else {
+ printk_ratelimited("Port %d unknown preamble, packet dropped\n",
+ work->ipprt);
+ /*
+ cvmx_helper_dump_packet(work);
+ */
+ cvm_oct_free_work(work);
+ return 1;
+ }
+ }
+ } else {
+ printk_ratelimited("Port %d receive error code %d, packet dropped\n",
+ work->ipprt, work->word2.snoip.err_code);
+ cvm_oct_free_work(work);
+ return 1;
+ }
+
+ return 0;
+}
+
+/**
+ * cvm_oct_napi_poll - the NAPI poll function.
+ * @napi: The NAPI instance, or null if called from cvm_oct_poll_controller
+ * @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)
+{
+ const int coreid = cvmx_get_core_num();
+ uint64_t old_group_mask;
+ uint64_t 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) */
+ 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) | 1 << pow_receive_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;
+ cvmx_wqe_t *work;
+
+ 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 == NULL) {
+ union cvmx_pow_wq_int wq_int;
+
+ wq_int.u64 = 0;
+ wq_int.s.iq_dis = 1 << pow_receive_group;
+ wq_int.s.wq_int = 1 << pow_receive_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 = USE_SKBUFFS_IN_HW && work->word2.s.bufs == 1;
+ if (likely(skb_in_hw)) {
+ skb = *pskb;
+ prefetch(&skb->head);
+ prefetch(&skb->len);
+ }
+ prefetch(cvm_oct_device[work->ipprt]);
+
+ /* 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->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->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)) {
+ uint8_t *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;
+ }
+ memcpy(skb_put(skb, work->len), ptr, work->len);
+ /* No packet buffers to free */
+ } else {
+ int segments = work->word2.s.bufs;
+ union cvmx_buf_ptr segment_ptr =
+ work->packet_ptr;
+ int len = work->len;
+
+ while (segments--) {
+ union cvmx_buf_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;
+ */
+ int 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 */
+ memcpy(skb_put(skb, segment_size),
+ cvmx_phys_to_ptr(segment_ptr.s.addr),
+ segment_size);
+ len -= segment_size;
+ segment_ptr = next_ptr;
+ }
+ }
+ packet_not_copied = 0;
+ }
+
+ if (likely((work->ipprt < TOTAL_NUMBER_OF_PORTS) &&
+ cvm_oct_device[work->ipprt])) {
+ struct net_device *dev = cvm_oct_device[work->ipprt];
+ struct octeon_ethernet *priv = netdev_priv(dev);
+
+ /*
+ * 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 (work->ipprt >= CVMX_PIP_NUM_INPUT_PORTS) {
+#ifdef CONFIG_64BIT
+ atomic64_add(1,
+ (atomic64_t *)&priv->stats.rx_packets);
+ atomic64_add(skb->len,
+ (atomic64_t *)&priv->stats.rx_bytes);
+#else
+ atomic_add(1,
+ (atomic_t *)&priv->stats.rx_packets);
+ atomic_add(skb->len,
+ (atomic_t *)&priv->stats.rx_bytes);
+#endif
+ }
+ netif_receive_skb(skb);
+ } else {
+ /* Drop any packet received for a device that isn't up */
+ /*
+ printk_ratelimited("%s: Device not up, packet dropped\n",
+ dev->name);
+ */
+#ifdef CONFIG_64BIT
+ atomic64_add(1,
+ (atomic64_t *)&priv->stats.rx_dropped);
+#else
+ atomic_add(1,
+ (atomic_t *)&priv->stats.rx_dropped);
+#endif
+ 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",
+ work->ipprt);
+ dev_kfree_skb_irq(skb);
+ }
+ /*
+ * Check to see if the skbuff and work share the same
+ * packet buffer.
+ */
+ if (USE_SKBUFFS_IN_HW && 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,
+ DONT_WRITEBACK(1));
+ } else {
+ cvm_oct_free_work(work);
+ }
+ }
+ /* Restore the original POW group mask */
+ 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);
+
+ if (rx_count < budget && napi != NULL) {
+ /* No more work */
+ napi_complete(napi);
+ enable_irq(OCTEON_IRQ_WORKQ0 + pow_receive_group);
+ }
+ 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)
+{
+ cvm_oct_napi_poll(NULL, 16);
+}
+#endif
+
+void cvm_oct_rx_initialize(void)
+{
+ int i;
+ struct net_device *dev_for_napi = NULL;
+ union cvmx_pow_wq_int_thrx int_thr;
+ union cvmx_pow_wq_int_pc int_pc;
+
+ for (i = 0; i < TOTAL_NUMBER_OF_PORTS; i++) {
+ if (cvm_oct_device[i]) {
+ dev_for_napi = cvm_oct_device[i];
+ break;
+ }
+ }
+
+ if (NULL == dev_for_napi)
+ panic("No net_devices were allocated.");
+
+ netif_napi_add(dev_for_napi, &cvm_oct_napi, cvm_oct_napi_poll,
+ rx_napi_weight);
+ napi_enable(&cvm_oct_napi);
+
+ /* Register an IRQ handler to receive POW interrupts */
+ i = request_irq(OCTEON_IRQ_WORKQ0 + pow_receive_group,
+ cvm_oct_do_interrupt, 0, "Ethernet", cvm_oct_device);
+
+ if (i)
+ panic("Could not acquire Ethernet IRQ %d\n",
+ OCTEON_IRQ_WORKQ0 + pow_receive_group);
+
+ disable_irq_nosync(OCTEON_IRQ_WORKQ0 + pow_receive_group);
+
+ int_thr.u64 = 0;
+ int_thr.s.tc_en = 1;
+ int_thr.s.tc_thr = 1;
+ /* Enable POW interrupt when our port has at least one packet */
+ cvmx_write_csr(CVMX_POW_WQ_INT_THRX(pow_receive_group), 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(&cvm_oct_napi);
+}
+
+void cvm_oct_rx_shutdown(void)
+{
+ netif_napi_del(&cvm_oct_napi);
+}
Code Review / kvmfornfv.git / blobdiff