/********************************************************************** * Author: Cavium Networks * * Contact: support@caviumnetworks.com * This file is part of the OCTEON SDK * * Copyright (c) 2003-2007 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_XFRM #include #include #endif /* CONFIG_XFRM */ #include #include #include "ethernet-defines.h" #include "octeon-ethernet.h" #include "ethernet-mem.h" #include "ethernet-util.h" #include "cvmx-helper.h" #include "cvmx-wqe.h" #include "cvmx-fau.h" #include "cvmx-pow.h" #include "cvmx-pip.h" #include "cvmx-scratch.h" #include "cvmx-gmxx-defs.h" struct cvm_tasklet_wrapper { struct tasklet_struct t; }; /* * Aligning the tasklet_struct on cachline boundries seems to decrease * throughput even though in theory it would reduce contantion on the * cache lines containing the locks. */ static struct cvm_tasklet_wrapper cvm_oct_tasklet[NR_CPUS]; /** * Interrupt handler. The interrupt occurs whenever the POW * transitions from 0->1 packets in our group. * * @cpl: * @dev_id: * @regs: * Returns */ irqreturn_t cvm_oct_do_interrupt(int cpl, void *dev_id) { /* Acknowledge the interrupt */ if (INTERRUPT_LIMIT) cvmx_write_csr(CVMX_POW_WQ_INT, 1 << pow_receive_group); else cvmx_write_csr(CVMX_POW_WQ_INT, 0x10001 << pow_receive_group); preempt_disable(); tasklet_schedule(&cvm_oct_tasklet[smp_processor_id()].t); preempt_enable(); return IRQ_HANDLED; } #ifdef CONFIG_NET_POLL_CONTROLLER /** * This is called when the kernel needs to manually poll the * device. For Octeon, this is simply calling the interrupt * handler. We actually poll all the devices, not just the * one supplied. * * @dev: Device to poll. Unused */ void cvm_oct_poll_controller(struct net_device *dev) { preempt_disable(); tasklet_schedule(&cvm_oct_tasklet[smp_processor_id()].t); preempt_enable(); } #endif /** * This is called on receive errors, and determines if the packet * can be dropped early-on in cvm_oct_tasklet_rx(). * * @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) { /* DEBUGPRINT("Port %d received 0xd5 preamble\n", work->ipprt); */ work->packet_ptr.s.addr += i + 1; work->len -= i + 5; } else if ((*ptr & 0xf) == 0xd) { /* DEBUGPRINT("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 { DEBUGPRINT("Port %d unknown preamble, packet " "dropped\n", work->ipprt); /* cvmx_helper_dump_packet(work); */ cvm_oct_free_work(work); return 1; } } } else { DEBUGPRINT("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; } /** * Tasklet function that is scheduled on a core when an interrupt occurs. * * @unused: */ void cvm_oct_tasklet_rx(unsigned long unused) { const int coreid = cvmx_get_core_num(); uint64_t old_group_mask; uint64_t old_scratch; int rx_count = 0; int number_to_free; int num_freed; 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); while (1) { struct sk_buff *skb = NULL; int skb_in_hw; cvmx_wqe_t *work; if (USE_ASYNC_IOBDMA) { work = cvmx_pow_work_response_async(CVMX_SCR_SCRATCH); } else { if ((INTERRUPT_LIMIT == 0) || likely(rx_count < MAX_RX_PACKETS)) work = cvmx_pow_work_request_sync (CVMX_POW_NO_WAIT); else work = NULL; } prefetch(work); if (work == NULL) break; /* * Limit each core to processing MAX_RX_PACKETS * packets without a break. This way the RX can't * starve the TX task. */ if (USE_ASYNC_IOBDMA) { if ((INTERRUPT_LIMIT == 0) || likely(rx_count < MAX_RX_PACKETS)) cvmx_pow_work_request_async_nocheck (CVMX_SCR_SCRATCH, CVMX_POW_NO_WAIT); else { cvmx_scratch_write64(CVMX_SCR_SCRATCH, 0x8000000000000000ull); cvmx_pow_tag_sw_null_nocheck(); } } skb_in_hw = USE_SKBUFFS_IN_HW && work->word2.s.bufs == 1; if (likely(skb_in_hw)) { skb = *(struct sk_buff **)(cvm_oct_get_buffer_ptr(work->packet_ptr) - sizeof(void *)); prefetch(&skb->head); prefetch(&skb->len); } prefetch(cvm_oct_device[work->ipprt]); rx_count++; /* 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)) { /* * This calculation was changed in case the * skb header is using a different address * aliasing type than the buffer. It doesn't * make any differnece now, but the new one is * more correct. */ 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) { DEBUGPRINT("Port %d failed to allocate " "skbuff, packet dropped\n", work->ipprt); cvm_oct_free_work(work); continue; } /* * Check if we've received a packet that was * entirely stored in the work entry. This is * untested. */ 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); /* Reduce the amount of bytes left to copy */ 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)) 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. */ /* DEBUGPRINT("%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. */ DEBUGPRINT("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); } if (USE_SKBUFFS_IN_HW) { /* Refill the packet buffer pool */ number_to_free = cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0); if (number_to_free > 0) { cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -number_to_free); num_freed = cvm_oct_mem_fill_fpa(CVMX_FPA_PACKET_POOL, CVMX_FPA_PACKET_POOL_SIZE, number_to_free); if (num_freed != number_to_free) { cvmx_fau_atomic_add32 (FAU_NUM_PACKET_BUFFERS_TO_FREE, number_to_free - num_freed); } } } } void cvm_oct_rx_initialize(void) { int i; /* Initialize all of the tasklets */ for (i = 0; i < NR_CPUS; i++) tasklet_init(&cvm_oct_tasklet[i].t, cvm_oct_tasklet_rx, 0); } void cvm_oct_rx_shutdown(void) { int i; /* Shutdown all of the tasklets */ for (i = 0; i < NR_CPUS; i++) tasklet_kill(&cvm_oct_tasklet[i].t); }