From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Metcalf Subject: [PATCH v6] tilegx network driver: initial support Date: Sun, 20 May 2012 00:42:03 -0400 Message-ID: <201205201636.q4KGaoA3003845@farm-0027.internal.tilera.com> References: <201205011759.q41HxR21020043@farm-0012.internal.tilera.com> <20120503.014156.149171097979026872.davem@davemloft.net> <201205031936.q43Ja9Xb031644@lab-41.internal.tilera.com> <20120504.024216.1730395431103337434.davem@davemloft.net> <201205091452.q49EqcO7005975@farm-0027.internal.tilera.com> <1336744445.2874.57.camel@bwh-desktop.uk.solarflarecom.com> Mime-Version: 1.0 Content-Type: text/plain To: Ben Hutchings , David Miller , , , Return-path: In-Reply-To: <1336744445.2874.57.camel@bwh-desktop.uk.solarflarecom.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org This change adds support for the tilegx network driver based on the GXIO IORPC support in the tilegx software stack, using the on-chip mPIPE packet processing engine. Signed-off-by: Chris Metcalf --- drivers/net/ethernet/tile/Kconfig | 1 + drivers/net/ethernet/tile/Makefile | 4 +- drivers/net/ethernet/tile/tilegx.c | 1888 ++++++++++++++++++++++++++++++++++++ 3 files changed, 1891 insertions(+), 2 deletions(-) create mode 100644 drivers/net/ethernet/tile/tilegx.c diff --git a/drivers/net/ethernet/tile/Kconfig b/drivers/net/ethernet/tile/Kconfig index 2d9218f..9184b61 100644 --- a/drivers/net/ethernet/tile/Kconfig +++ b/drivers/net/ethernet/tile/Kconfig @@ -7,6 +7,7 @@ config TILE_NET depends on TILE default y select CRC32 + select TILE_GXIO_MPIPE if TILEGX ---help--- This is a standard Linux network device driver for the on-chip Tilera Gigabit Ethernet and XAUI interfaces. diff --git a/drivers/net/ethernet/tile/Makefile b/drivers/net/ethernet/tile/Makefile index f634f14..0ef9eef 100644 --- a/drivers/net/ethernet/tile/Makefile +++ b/drivers/net/ethernet/tile/Makefile @@ -4,7 +4,7 @@ obj-$(CONFIG_TILE_NET) += tile_net.o ifdef CONFIG_TILEGX -tile_net-objs := tilegx.o mpipe.o iorpc_mpipe.o dma_queue.o +tile_net-y := tilegx.o else -tile_net-objs := tilepro.o +tile_net-y := tilepro.o endif diff --git a/drivers/net/ethernet/tile/tilegx.c b/drivers/net/ethernet/tile/tilegx.c new file mode 100644 index 0000000..ab0d03e --- /dev/null +++ b/drivers/net/ethernet/tile/tilegx.c @@ -0,0 +1,1888 @@ +/* + * Copyright 2012 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#include +#include +#include +#include +#include /* printk() */ +#include /* kmalloc() */ +#include /* error codes */ +#include /* size_t */ +#include +#include +#include +#include /* struct device, and other headers */ +#include /* eth_type_trans */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + + +/* Default transmit lockup timeout period, in jiffies. */ +#define TILE_NET_TIMEOUT (5 * HZ) + +/* The maximum number of distinct channels (idesc.channel is 5 bits). */ +#define TILE_NET_CHANNELS 32 + +/* Maximum number of idescs to handle per "poll". */ +#define TILE_NET_BATCH 128 + +/* Maximum number of packets to handle per "poll". */ +#define TILE_NET_WEIGHT 64 + +/* Number of entries in each iqueue. */ +#define IQUEUE_ENTRIES 512 + +/* Number of entries in each equeue. */ +#define EQUEUE_ENTRIES 2048 + +/* Total header bytes per equeue slot. Must be big enough for 2 bytes + * of NET_IP_ALIGN alignment, plus 14 bytes (?) of L2 header, plus up to + * 60 bytes of actual TCP header. We round up to align to cache lines. + */ +#define HEADER_BYTES 128 + +/* Maximum completions per cpu per device (must be a power of two). + * ISSUE: What is the right number here? If this is too small, then + * egress might block waiting for free space in a completions array. + * ISSUE: At the least, allocate these only for initialized echannels. + */ +#define TILE_NET_MAX_COMPS 64 + +#define MAX_FRAGS (MAX_SKB_FRAGS + 1) + +MODULE_AUTHOR("Tilera Corporation"); +MODULE_LICENSE("GPL"); + +/* A "packet fragment" (a chunk of memory). */ +struct frag { + void *buf; + size_t length; +}; + +/* A single completion. */ +struct tile_net_comp { + /* The "complete_count" when the completion will be complete. */ + s64 when; + /* The buffer to be freed when the completion is complete. */ + struct sk_buff *skb; +}; + +/* The completions for a given cpu and device. */ +struct tile_net_comps { + /* The completions. */ + struct tile_net_comp comp_queue[TILE_NET_MAX_COMPS]; + /* The number of completions used. */ + unsigned long comp_next; + /* The number of completions freed. */ + unsigned long comp_last; +}; + +/* Info for a specific cpu. */ +struct tile_net_info { + /* The NAPI struct. */ + struct napi_struct napi; + /* Packet queue. */ + gxio_mpipe_iqueue_t iqueue; + /* Our cpu. */ + int my_cpu; + /* True if iqueue is valid. */ + bool has_iqueue; + /* NAPI flags. */ + bool napi_added; + bool napi_enabled; + /* Number of small sk_buffs which must still be provided. */ + unsigned int num_needed_small_buffers; + /* Number of large sk_buffs which must still be provided. */ + unsigned int num_needed_large_buffers; + /* A timer for handling egress completions. */ + struct timer_list egress_timer; + /* True if "egress_timer" is scheduled. */ + bool egress_timer_scheduled; + /* Comps for each egress channel. */ + struct tile_net_comps *comps_for_echannel[TILE_NET_CHANNELS]; +}; + +/* Info for egress on a particular egress channel. */ +struct tile_net_egress { + /* The "equeue". */ + gxio_mpipe_equeue_t *equeue; + /* The headers for TSO. */ + unsigned char *headers; +}; + +/* Info for a specific device. */ +struct tile_net_priv { + /* Our network device. */ + struct net_device *dev; + /* The primary link. */ + gxio_mpipe_link_t link; + /* The primary channel, if open, else -1. */ + int channel; + /* The "loopify" egress link, if needed. */ + gxio_mpipe_link_t loopify_link; + /* The "loopify" egress channel, if open, else -1. */ + int loopify_channel; + /* The egress channel (channel or loopify_channel). */ + int echannel; + /* Total stats. */ + struct net_device_stats stats; +}; + +/* Egress info, indexed by "priv->echannel" (lazily created as needed). */ +static struct tile_net_egress egress_for_echannel[TILE_NET_CHANNELS]; + +/* Devices currently associated with each channel. + * NOTE: The array entry can become NULL after ifconfig down, but + * we do not free the underlying net_device structures, so it is + * safe to use a pointer after reading it from this array. + */ +static struct net_device *tile_net_devs_for_channel[TILE_NET_CHANNELS]; + +/* A mutex for "tile_net_devs_for_channel". */ +static DEFINE_MUTEX(tile_net_devs_for_channel_mutex); + +/* The per-cpu info. */ +static DEFINE_PER_CPU(struct tile_net_info, per_cpu_info); + +/* The "context" for all devices. */ +static gxio_mpipe_context_t context; + +/* The small/large "buffer stacks". */ +static int small_buffer_stack = -1; +static int large_buffer_stack = -1; + +/* The buckets. */ +static int first_bucket = -1; +static int num_buckets = 1; + +/* The ingress irq. */ +static int ingress_irq = -1; + +/* Text value of tile_net.cpus if passed as a module parameter. */ +static char *network_cpus_string; + +/* The actual cpus in "network_cpus". */ +static struct cpumask network_cpus_map; + +/* If "loopify=LINK" was specified, this is "LINK". */ +static char *loopify_link_name; + +/* If "tile_net.custom" was specified, this is non-NULL. */ +static char *custom_str; + +/* The "tile_net.cpus" argument specifies the cpus that are dedicated + * to handle ingress packets. + * + * The parameter should be in the form "tile_net.cpus=m-n[,x-y]", where + * m, n, x, y are integer numbers that represent the cpus that can be + * neither a dedicated cpu nor a dataplane cpu. + */ +static bool network_cpus_init(void) +{ + char buf[1024]; + int rc; + + if (network_cpus_string == NULL) + return false; + + rc = cpulist_parse_crop(network_cpus_string, &network_cpus_map); + if (rc != 0) { + pr_warn("tile_net.cpus=%s: malformed cpu list\n", + network_cpus_string); + return false; + } + + /* Remove dedicated cpus. */ + cpumask_and(&network_cpus_map, &network_cpus_map, cpu_possible_mask); + + if (cpumask_empty(&network_cpus_map)) { + pr_warn("Ignoring empty tile_net.cpus='%s'.\n", + network_cpus_string); + return false; + } + + cpulist_scnprintf(buf, sizeof(buf), &network_cpus_map); + pr_info("Linux network CPUs: %s\n", buf); + return true; +} + +module_param_named(cpus, network_cpus_string, charp, 0444); +MODULE_PARM_DESC(cpus, "cpulist of cores that handle network interrupts"); + +/* The "tile_net.loopify=LINK" argument causes the named device to + * actually use "loop0" for ingress, and "loop1" for egress. This + * allows an app to sit between the actual link and linux, passing + * (some) packets along to linux, and forwarding (some) packets sent + * out by linux. + */ +module_param_named(loopify, loopify_link_name, charp, 0444); +MODULE_PARM_DESC(loopify, "name the device to use loop0/1 for ingress/egress"); + +/* The "tile_net.custom" argument causes us to ignore the "conventional" + * classifier metadata, in particular, the "l2_offset". + */ +module_param_named(custom, custom_str, charp, 0444); +MODULE_PARM_DESC(custom, "indicates a (heavily) customized classifier"); + +/* Atomically update a statistics field. + * Note that on TILE-Gx, this operation is fire-and-forget on the + * issuing core (single-cycle dispatch) and takes only a few cycles + * longer than a regular store when the request reaches the home cache. + * No expensive bus management overhead is required. + */ +static void tile_net_stats_add(unsigned long value, unsigned long *field) +{ + BUILD_BUG_ON(sizeof(atomic_long_t) != sizeof(unsigned long)); + atomic_long_add(value, (atomic_long_t *)field); +} + +/* Allocate and push a buffer. */ +static bool tile_net_provide_buffer(bool small) +{ + int stack = small ? small_buffer_stack : large_buffer_stack; + + /* Buffers must be aligned. */ + const unsigned long align = 128; + + /* Note that "dev_alloc_skb()" adds NET_SKB_PAD more bytes, + * and also "reserves" that many bytes. + */ + int len = sizeof(struct sk_buff **) + align + (small ? 128 : 1664); + + /* Allocate (or fail). */ + struct sk_buff *skb = dev_alloc_skb(len); + if (skb == NULL) + return false; + + /* Make room for a back-pointer to 'skb'. */ + skb_reserve(skb, sizeof(struct sk_buff **)); + + /* Make sure we are aligned. */ + skb_reserve(skb, -(long)skb->data & (align - 1)); + + /* Save a back-pointer to 'skb'. */ + *(struct sk_buff **)(skb->data - sizeof(struct sk_buff **)) = skb; + + /* Make sure "skb" and the back-pointer have been flushed. */ + wmb(); + + gxio_mpipe_push_buffer(&context, stack, + (void *)va_to_tile_io_addr(skb->data)); + + return true; +} + +static void tile_net_pop_all_buffers(int stack) +{ + void *va; + while ((va = gxio_mpipe_pop_buffer(&context, stack)) != NULL) { + struct sk_buff **skb_ptr = va - sizeof(*skb_ptr); + struct sk_buff *skb = *skb_ptr; + dev_kfree_skb_irq(skb); + } +} + +/* Provide linux buffers to mPIPE. */ +static void tile_net_provide_needed_buffers(struct tile_net_info *info) +{ + while (info->num_needed_small_buffers != 0) { + if (!tile_net_provide_buffer(true)) + goto oops; + info->num_needed_small_buffers--; + } + + while (info->num_needed_large_buffers != 0) { + if (!tile_net_provide_buffer(false)) + goto oops; + info->num_needed_large_buffers--; + } + + return; + +oops: + /* Add a description to the page allocation failure dump. */ + pr_notice("Tile %d still needs some buffers\n", info->my_cpu); +} + +/* Handle a packet. Return true if "processed", false if "filtered". */ +static bool tile_net_handle_packet(struct tile_net_info *info, + gxio_mpipe_idesc_t *idesc) +{ + struct net_device *dev = tile_net_devs_for_channel[idesc->channel]; + uint8_t l2_offset; + void *va; + void *buf; + unsigned long len; + int filter = 0; + + /* Drop packets for which no buffer was available. + * NOTE: This happens under heavy load. + */ + if (idesc->be) { + gxio_mpipe_iqueue_consume(&info->iqueue, idesc); + if (net_ratelimit()) + pr_info("Dropping packet (insufficient buffers).\n"); + return false; + } + + /* Get the "l2_offset", if allowed. */ + l2_offset = custom_str ? 0 : gxio_mpipe_idesc_get_l2_offset(idesc); + + /* Get the raw buffer VA (includes "headroom"). */ + va = tile_io_addr_to_va((unsigned long)(long)idesc->va); + + /* Get the actual packet start/length. */ + buf = va + l2_offset; + len = idesc->l2_size - l2_offset; + + /* Point "va" at the raw buffer. */ + va -= NET_IP_ALIGN; + + if (dev != NULL) { + /* ISSUE: Is this needed? */ + dev->last_rx = jiffies; + } + + if (dev == NULL || !(dev->flags & IFF_UP)) { + /* Filter packets received before we're up. */ + filter = 1; + } else if (!(dev->flags & IFF_PROMISC)) { + /* ISSUE: "eth_type_trans()" implies that "IFF_PROMISC" + * is set for "all silly devices", however, it appears + * to NOT be set for us, so this code here DOES run. + */ + if (!is_multicast_ether_addr(buf)) { + /* Filter packets not for our address. */ + const u8 *mine = dev->dev_addr; + filter = compare_ether_addr(mine, buf); + } + } + + if (filter) { + + /* ISSUE: Update "drop" statistics? */ + + gxio_mpipe_iqueue_drop(&info->iqueue, idesc); + + } else { + + struct tile_net_priv *priv = netdev_priv(dev); + + /* Acquire the associated "skb". */ + struct sk_buff **skb_ptr = va - sizeof(*skb_ptr); + struct sk_buff *skb = *skb_ptr; + + /* Paranoia. */ + if (skb->data != va) { + /* Panic here since there's a reasonable chance + * that corrupt buffers means generic memory + * corruption, with unpredictable system effects. + */ + panic("Corrupt linux buffer! " + "buf=%p, skb=%p, skb->data=%p", + buf, skb, skb->data); + } + + /* Skip headroom, and any custom header. */ + skb_reserve(skb, NET_IP_ALIGN + l2_offset); + + /* Encode the actual packet length. */ + skb_put(skb, len); + + /* NOTE: This call also sets "skb->dev = dev". + * ISSUE: The classifier provides us with "eth_type" + * (aka "eth->h_proto"), which is basically the value + * returned by "eth_type_trans()". + * Note that "eth_type_trans()" computes "skb->pkt_type", + * which would be useful for the "filter" check above, + * if we had a (modifiable) "skb" to work with. + */ + skb->protocol = eth_type_trans(skb, dev); + + /* Acknowledge "good" hardware checksums. */ + if (idesc->cs && idesc->csum_seed_val == 0xFFFF) + skb->ip_summed = CHECKSUM_UNNECESSARY; + + netif_receive_skb(skb); + + /* Update stats. */ + tile_net_stats_add(1, &priv->stats.rx_packets); + tile_net_stats_add(len, &priv->stats.rx_bytes); + + /* Need a new buffer. */ + if (idesc->size == GXIO_MPIPE_BUFFER_SIZE_128) + info->num_needed_small_buffers++; + else + info->num_needed_large_buffers++; + } + + gxio_mpipe_iqueue_consume(&info->iqueue, idesc); + + return !filter; +} + +/* Handle some packets for the current CPU. + * + * This function handles up to TILE_NET_BATCH idescs per call. + * + * ISSUE: Since we do not provide new buffers until this function is + * complete, we must initially provide enough buffers for each network + * cpu to fill its iqueue and also its batched idescs. + * + * ISSUE: The "rotting packet" race condition occurs if a packet + * arrives after the queue appears to be empty, and before the + * hypervisor interrupt is re-enabled. + */ +static int tile_net_poll(struct napi_struct *napi, int budget) +{ + struct tile_net_info *info = &__get_cpu_var(per_cpu_info); + unsigned int work = 0; + gxio_mpipe_idesc_t *idesc; + int i, n; + + /* Process packets. */ + while ((n = gxio_mpipe_iqueue_try_peek(&info->iqueue, &idesc)) > 0) { + for (i = 0; i < n; i++) { + if (i == TILE_NET_BATCH) + goto done; + if (tile_net_handle_packet(info, idesc + i)) { + if (++work >= budget) + goto done; + } + } + } + + /* There are no packets left. */ + napi_complete(&info->napi); + + /* Re-enable hypervisor interrupts. */ + gxio_mpipe_enable_notif_ring_interrupt(&context, info->iqueue.ring); + + /* HACK: Avoid the "rotting packet" problem. */ + if (gxio_mpipe_iqueue_try_peek(&info->iqueue, &idesc) > 0) + napi_schedule(&info->napi); + + /* ISSUE: Handle completions? */ + +done: + tile_net_provide_needed_buffers(info); + + return work; +} + +/* Handle an ingress interrupt on the current cpu. */ +static irqreturn_t tile_net_handle_ingress_irq(int irq, void *unused) +{ + struct tile_net_info *info = &__get_cpu_var(per_cpu_info); + napi_schedule(&info->napi); + return IRQ_HANDLED; +} + +/* Free some completions. This must be called with interrupts blocked. */ +static void tile_net_free_comps(gxio_mpipe_equeue_t *equeue, + struct tile_net_comps *comps, + int limit, bool force_update) +{ + int n = 0; + while (comps->comp_last < comps->comp_next) { + unsigned int cid = comps->comp_last % TILE_NET_MAX_COMPS; + struct tile_net_comp *comp = &comps->comp_queue[cid]; + if (!gxio_mpipe_equeue_is_complete(equeue, comp->when, + force_update || n == 0)) + return; + dev_kfree_skb_irq(comp->skb); + comps->comp_last++; + if (++n == limit) + return; + } +} + +/* Add a completion. This must be called with interrupts blocked. + * + * FIXME: We should probably have stopped the queue earlier rather + * than having to wait here. + */ +static void add_comp(gxio_mpipe_equeue_t *equeue, + struct tile_net_comps *comps, + uint64_t when, struct sk_buff *skb) +{ + int cid; + + /* Wait for a free completion entry, if needed. */ + while (comps->comp_next - comps->comp_last >= TILE_NET_MAX_COMPS - 1) + tile_net_free_comps(equeue, comps, 32, false); + + /* Update the completions array. */ + cid = comps->comp_next % TILE_NET_MAX_COMPS; + comps->comp_queue[cid].when = when; + comps->comp_queue[cid].skb = skb; + comps->comp_next++; +} + +/* Make sure the egress timer is scheduled. + * + * Note that we use "schedule if not scheduled" logic instead of the more + * obvious "reschedule" logic, because "reschedule" is fairly expensive. + */ +static void tile_net_schedule_egress_timer(struct tile_net_info *info) +{ + if (!info->egress_timer_scheduled) { + mod_timer_pinned(&info->egress_timer, jiffies + 1); + info->egress_timer_scheduled = true; + } +} + +/* The "function" for "info->egress_timer". + * + * This timer will reschedule itself as long as there are any pending + * completions expected for this tile. + */ +static void tile_net_handle_egress_timer(unsigned long arg) +{ + struct tile_net_info *info = (struct tile_net_info *)arg; + unsigned long irqflags; + bool pending = false; + int i; + + local_irq_save(irqflags); + + /* The timer is no longer scheduled. */ + info->egress_timer_scheduled = false; + + /* Free all possible comps for this tile. */ + for (i = 0; i < TILE_NET_CHANNELS; i++) { + struct tile_net_egress *egress = &egress_for_echannel[i]; + struct tile_net_comps *comps = info->comps_for_echannel[i]; + if (comps->comp_last >= comps->comp_next) + continue; + tile_net_free_comps(egress->equeue, comps, -1, true); + pending = pending || (comps->comp_last < comps->comp_next); + } + + /* Reschedule timer if needed. */ + if (pending) + tile_net_schedule_egress_timer(info); + + local_irq_restore(irqflags); +} + +/* Prepare each CPU. */ +static void tile_net_prepare_cpu(void *unused) +{ + struct tile_net_info *info = &__get_cpu_var(per_cpu_info); + int my_cpu = smp_processor_id(); + + info->has_iqueue = false; + + info->my_cpu = my_cpu; + + /* Initialize the egress timer. */ + init_timer(&info->egress_timer); + info->egress_timer.data = (long)info; + info->egress_timer.function = tile_net_handle_egress_timer; +} + +/* Helper function for "tile_net_update()". */ +static void tile_net_update_cpu(void *arg) +{ + struct net_device *dev = arg; + struct tile_net_info *info = &__get_cpu_var(per_cpu_info); + + if (info->has_iqueue) { + if (dev != NULL) { + if (!info->napi_added) { + netif_napi_add(dev, &info->napi, + tile_net_poll, TILE_NET_WEIGHT); + info->napi_added = true; + } + if (!info->napi_enabled) { + napi_enable(&info->napi); + info->napi_enabled = true; + } + enable_percpu_irq(ingress_irq, 0); + } else { + disable_percpu_irq(ingress_irq); + if (info->napi_enabled) { + napi_disable(&info->napi); + info->napi_enabled = false; + } + /* FIXME: Drain the iqueue. */ + } + } +} + +/* Helper function for tile_net_open() and tile_net_stop(). + * Always called under tile_net_devs_for_channel_mutex. + */ +static int tile_net_update(struct net_device *dev) +{ + bool saw_channel = false; + int channel; + int rc; + int cpu; + + /* This is too big to fit on the stack. */ + static gxio_mpipe_rules_t rules; + + gxio_mpipe_rules_init(&rules, &context); + + for (channel = 0; channel < TILE_NET_CHANNELS; channel++) { + if (tile_net_devs_for_channel[channel] == NULL) + continue; + if (!saw_channel) { + saw_channel = true; + gxio_mpipe_rules_begin(&rules, first_bucket, + num_buckets, NULL); + gxio_mpipe_rules_set_headroom(&rules, NET_IP_ALIGN); + } + gxio_mpipe_rules_add_channel(&rules, channel); + } + + /* NOTE: This can fail if there is no classifier. + * ISSUE: Can anything else cause it to fail? + */ + rc = gxio_mpipe_rules_commit(&rules); + if (rc != 0) { + netdev_warn(dev, "gxio_mpipe_rules_commit failed: %d\n", rc); + return -EIO; + } + + /* Update all cpus, sequentially (to protect "netif_napi_add()"). */ + for_each_online_cpu(cpu) + smp_call_function_single(cpu, tile_net_update_cpu, + (saw_channel ? dev : NULL), 1); + + /* HACK: Allow packets to flow in the simulator. */ + if (saw_channel) + sim_enable_mpipe_links(0, -1); + + return 0; +} + +/* The first time any tilegx network device is opened, we initialize + * the global mpipe state. If this step fails, we fail to open the + * device, but if it succeeds, we never need to do it again, and since + * tile_net can't be unloaded, we never undo it. + * + * Note that some resources in this path (buffer stack indices, + * bindings from init_buffer_stack, etc.) are hypervisor resources + * that are freed simply via gxio_mpipe_destroy(). + */ +static int tile_net_init_mpipe(struct net_device *dev) +{ + gxio_mpipe_buffer_size_enum_t small_buf_size = + GXIO_MPIPE_BUFFER_SIZE_128; + gxio_mpipe_buffer_size_enum_t large_buf_size = + GXIO_MPIPE_BUFFER_SIZE_1664; + size_t stack_bytes; + pte_t pte = { 0 }; + void *small = NULL; + void *large = NULL; + int i, num_buffers, rc; + int network_cpus_count, cpu; + int ring, group, next_ring; + size_t comps_size = 0; + size_t notif_ring_size = 0; + + if (!hash_default) { + netdev_err(dev, "Networking requires hash_default!\n"); + return -EIO; + } + + rc = gxio_mpipe_init(&context, 0); + if (rc != 0) { + netdev_err(dev, "gxio_mpipe_init failed: %d\n", rc); + return -EIO; + } + + network_cpus_count = cpus_weight(network_cpus_map); + + num_buffers = + network_cpus_count * (IQUEUE_ENTRIES + TILE_NET_BATCH); + + /* Compute stack bytes; we round up to 64KB and then use + * alloc_pages() so we get the required 64KB alignment as well. + */ + stack_bytes = ALIGN(gxio_mpipe_calc_buffer_stack_bytes(num_buffers), + 64 * 1024); + + /* Allocate two buffer stack indices. */ + rc = gxio_mpipe_alloc_buffer_stacks(&context, 2, 0, 0); + if (rc < 0) { + netdev_err(dev, "gxio_mpipe_alloc_buffer_stacks failed: %d\n", + rc); + goto fail; + } + small_buffer_stack = rc; + large_buffer_stack = rc + 1; + + /* Allocate the small memory stack. */ + small = alloc_pages_exact(stack_bytes, GFP_KERNEL); + if (small == NULL) { + netdev_err(dev, + "Could not alloc %zd bytes for buffer stacks\n", + stack_bytes); + rc = -ENOMEM; + goto fail; + } + rc = gxio_mpipe_init_buffer_stack(&context, small_buffer_stack, + small_buf_size, + small, stack_bytes, 0); + if (rc != 0) { + netdev_err(dev, "gxio_mpipe_init_buffer_stack: %d\n", rc); + goto fail; + } + + /* Allocate the large buffer stack. */ + large = alloc_pages_exact(stack_bytes, GFP_KERNEL); + if (large == NULL) { + netdev_err(dev, + "Could not alloc %zd bytes for buffer stacks\n", + stack_bytes); + rc = -ENOMEM; + goto fail; + } + rc = gxio_mpipe_init_buffer_stack(&context, large_buffer_stack, + large_buf_size, + large, stack_bytes, 0); + if (rc != 0) { + netdev_err(dev, "gxio_mpipe_init_buffer_stack failed: %d\n", + rc); + goto fail; + } + + /* Register all the client memory in mpipe TLBs. */ + pte = pte_set_home(pte, PAGE_HOME_HASH); + rc = gxio_mpipe_register_client_memory(&context, small_buffer_stack, + pte, 0); + if (rc != 0) { + netdev_err(dev, + "gxio_mpipe_register_buffer_memory failed: %d\n", + rc); + goto fail; + } + rc = gxio_mpipe_register_client_memory(&context, large_buffer_stack, + pte, 0); + if (rc != 0) { + netdev_err(dev, + "gxio_mpipe_register_buffer_memory failed: %d\n", + rc); + goto fail; + } + + /* Provide initial buffers. */ + rc = -ENOMEM; + for (i = 0; i < num_buffers; i++) { + if (!tile_net_provide_buffer(true)) { + netdev_err(dev, "Cannot allocate initial sk_bufs!\n"); + goto fail_pop; + } + } + for (i = 0; i < num_buffers; i++) { + if (!tile_net_provide_buffer(false)) { + netdev_err(dev, "Cannot allocate initial sk_bufs!\n"); + goto fail_pop; + } + } + + /* Allocate one NotifRing for each network cpu. */ + rc = gxio_mpipe_alloc_notif_rings(&context, network_cpus_count, + 0, 0); + if (rc < 0) { + netdev_err(dev, "gxio_mpipe_alloc_notif_rings failed %d\n", + rc); + goto fail_pop; + } + + /* Init NotifRings. */ + ring = rc; + next_ring = rc; + + /* ISSUE: This is more than strictly necessary. */ + comps_size = TILE_NET_CHANNELS * sizeof(struct tile_net_comps); + + notif_ring_size = IQUEUE_ENTRIES * sizeof(gxio_mpipe_idesc_t); + + for_each_online_cpu(cpu) { + + int order; + struct page *page; + void *addr; + + struct tile_net_info *info = &per_cpu(per_cpu_info, cpu); + + /* Allocate the "comps". */ + order = get_order(comps_size); + page = homecache_alloc_pages(GFP_KERNEL, order, cpu); + if (page == NULL) { + netdev_err(dev, + "Failed to alloc %zd bytes comps memory\n", + comps_size); + rc = -ENOMEM; + goto fail_pop; + } + + addr = pfn_to_kaddr(page_to_pfn(page)); + memset(addr, 0, comps_size); + for (i = 0; i < TILE_NET_CHANNELS; i++) + info->comps_for_echannel[i] = + addr + i * sizeof(struct tile_net_comps); + + /* Only network cpus can receive packets. */ + if (!cpu_isset(cpu, network_cpus_map)) + continue; + + /* Allocate the actual idescs array. */ + order = get_order(notif_ring_size); + page = homecache_alloc_pages(GFP_KERNEL, order, cpu); + if (page == NULL) { + netdev_err(dev, + "Failed to alloc %zd bytes iqueue memory\n", + notif_ring_size); + rc = -ENOMEM; + goto fail_pop; + } + addr = pfn_to_kaddr(page_to_pfn(page)); + rc = gxio_mpipe_iqueue_init(&info->iqueue, &context, next_ring, + addr, notif_ring_size, 0); + if (rc != 0) { + netdev_err(dev, + "gxio_mpipe_iqueue_init failed: %d\n", rc); + goto fail_pop; + } + + info->has_iqueue = true; + + next_ring++; + } + + /* Allocate one NotifGroup. */ + rc = gxio_mpipe_alloc_notif_groups(&context, 1, 0, 0); + if (rc < 0) { + netdev_err(dev, "gxio_mpipe_alloc_notif_groups failed: %d\n", + rc); + goto fail_pop; + } + group = rc; + + if (network_cpus_count > 4) + num_buckets = 256; + else if (network_cpus_count > 1) + num_buckets = 16; + + /* Allocate some buckets. */ + rc = gxio_mpipe_alloc_buckets(&context, num_buckets, 0, 0); + if (rc < 0) { + netdev_err(dev, "gxio_mpipe_alloc_buckets failed: %d\n", rc); + goto fail_pop; + } + first_bucket = rc; + + /* Init group and buckets. */ + rc = gxio_mpipe_init_notif_group_and_buckets( + &context, group, ring, network_cpus_count, + first_bucket, num_buckets, + GXIO_MPIPE_BUCKET_STICKY_FLOW_LOCALITY); + + if (rc != 0) { + netdev_err( + dev, + "gxio_mpipe_init_notif_group_and_buckets failed: %d\n", + rc); + goto fail_pop; + } + + /* Create an irq and register it. Note that "ingress_irq" being + * initialized is how we know not to call this function again. + */ + rc = create_irq(); + if (rc < 0) { + netdev_err(dev, "create_irq failed: %d\n", rc); + goto fail_pop; + + } + ingress_irq = rc; + tile_irq_activate(ingress_irq, TILE_IRQ_PERCPU); + rc = request_irq(ingress_irq, tile_net_handle_ingress_irq, + 0, NULL, NULL); + if (rc != 0) { + netdev_err(dev, "request_irq failed: %d\n", rc); + destroy_irq(ingress_irq); + ingress_irq = -1; + goto fail_pop; + } + + for_each_online_cpu(cpu) { + struct tile_net_info *info = &per_cpu(per_cpu_info, cpu); + if (info->has_iqueue) { + gxio_mpipe_request_notif_ring_interrupt( + &context, cpu_x(cpu), cpu_y(cpu), + 1, ingress_irq, info->iqueue.ring); + } + } + + return 0; + +fail_pop: + /* Do cleanups that require the mpipe context first. */ + tile_net_pop_all_buffers(small_buffer_stack); + tile_net_pop_all_buffers(large_buffer_stack); + +fail: + /* Destroy mpipe context so the hardware no longer owns any memory. */ + gxio_mpipe_destroy(&context); + + for_each_online_cpu(cpu) { + struct tile_net_info *info = &per_cpu(per_cpu_info, cpu); + free_pages((unsigned long)(info->comps_for_echannel[0]), + get_order(comps_size)); + info->comps_for_echannel[0] = NULL; + free_pages((unsigned long)(info->iqueue.idescs), + get_order(notif_ring_size)); + info->iqueue.idescs = NULL; + } + + if (small) + free_pages_exact(small, stack_bytes); + if (large) + free_pages_exact(large, stack_bytes); + + large_buffer_stack = -1; + small_buffer_stack = -1; + first_bucket = -1; + + return rc; +} + +/* Create persistent egress info for a given egress channel. + * + * Note that this may be shared between, say, "gbe0" and "xgbe0". + * + * ISSUE: Defer header allocation until TSO is actually needed? + */ +static int tile_net_init_egress(struct net_device *dev, int echannel) +{ + struct page *headers_page, *edescs_page, *equeue_page; + gxio_mpipe_edesc_t *edescs; + gxio_mpipe_equeue_t *equeue; + unsigned char *headers; + int headers_order, edescs_order, equeue_order; + size_t edescs_size; + int edma; + int rc = -ENOMEM; + + /* Only initialize once. */ + if (egress_for_echannel[echannel].equeue != NULL) + return 0; + + /* Allocate memory for the "headers". */ + headers_order = get_order(EQUEUE_ENTRIES * HEADER_BYTES); + headers_page = alloc_pages(GFP_KERNEL, headers_order); + if (headers_page == NULL) { + netdev_warn(dev, + "Could not alloc %zd bytes for TSO headers.\n", + PAGE_SIZE << headers_order); + goto fail; + } + headers = pfn_to_kaddr(page_to_pfn(headers_page)); + + /* Allocate memory for the "edescs". */ + edescs_size = EQUEUE_ENTRIES * sizeof(*edescs); + edescs_order = get_order(edescs_size); + edescs_page = alloc_pages(GFP_KERNEL, edescs_order); + if (edescs_page == NULL) { + netdev_warn(dev, + "Could not alloc %zd bytes for eDMA ring.\n", + edescs_size); + goto fail_headers; + } + edescs = pfn_to_kaddr(page_to_pfn(edescs_page)); + + /* Allocate memory for the "equeue". */ + equeue_order = get_order(sizeof(*equeue)); + equeue_page = alloc_pages(GFP_KERNEL, equeue_order); + if (equeue_page == NULL) { + netdev_warn(dev, + "Could not alloc %zd bytes for equeue info.\n", + PAGE_SIZE << equeue_order); + goto fail_edescs; + } + equeue = pfn_to_kaddr(page_to_pfn(equeue_page)); + + /* Allocate an edma ring. Note that in practice this can't + * fail, which is good, because we will leak an edma ring if so. + */ + rc = gxio_mpipe_alloc_edma_rings(&context, 1, 0, 0); + if (rc < 0) { + netdev_warn(dev, "gxio_mpipe_alloc_edma_rings failed: %d\n", + rc); + goto fail_equeue; + } + edma = rc; + + /* Initialize the equeue. */ + rc = gxio_mpipe_equeue_init(equeue, &context, edma, echannel, + edescs, edescs_size, 0); + if (rc != 0) { + netdev_err(dev, "gxio_mpipe_equeue_init failed: %d\n", rc); + goto fail_equeue; + } + + /* Done. */ + egress_for_echannel[echannel].equeue = equeue; + egress_for_echannel[echannel].headers = headers; + return 0; + +fail_equeue: + __free_pages(equeue_page, equeue_order); + +fail_edescs: + __free_pages(edescs_page, edescs_order); + +fail_headers: + __free_pages(headers_page, headers_order); + +fail: + return rc; +} + +/* Return channel number for a newly-opened link. */ +static int tile_net_link_open(struct net_device *dev, gxio_mpipe_link_t *link, + const char *link_name) +{ + int rc = gxio_mpipe_link_open(link, &context, link_name, 0); + if (rc < 0) { + netdev_err(dev, "Failed to open '%s'\n", link_name); + return rc; + } + rc = gxio_mpipe_link_channel(link); + if (rc < 0 || rc >= TILE_NET_CHANNELS) { + netdev_err(dev, "gxio_mpipe_link_channel bad value: %d\n", rc); + gxio_mpipe_link_close(link); + return -EINVAL; + } + return rc; +} + +/* Help the kernel activate the given network interface. */ +static int tile_net_open(struct net_device *dev) +{ + struct tile_net_priv *priv = netdev_priv(dev); + int rc; + + mutex_lock(&tile_net_devs_for_channel_mutex); + + /* Do one-time initialization the first time any device is opened. */ + if (ingress_irq < 0) { + rc = tile_net_init_mpipe(dev); + if (rc != 0) + goto fail; + } + + /* Determine if this is the "loopify" device. */ + if (unlikely((loopify_link_name != NULL) && + !strcmp(dev->name, loopify_link_name))) { + rc = tile_net_link_open(dev, &priv->link, "loop0"); + if (rc < 0) + goto fail; + priv->channel = rc; + rc = tile_net_link_open(dev, &priv->loopify_link, "loop1"); + if (rc < 0) + goto fail; + priv->loopify_channel = rc; + priv->echannel = rc; + } else { + rc = tile_net_link_open(dev, &priv->link, dev->name); + if (rc < 0) + goto fail; + priv->channel = rc; + priv->echannel = rc; + } + + /* Initialize egress info (if needed). Once ever, per echannel. */ + rc = tile_net_init_egress(dev, priv->echannel); + if (rc != 0) + goto fail; + + tile_net_devs_for_channel[priv->channel] = dev; + + rc = tile_net_update(dev); + if (rc != 0) + goto fail; + + mutex_unlock(&tile_net_devs_for_channel_mutex); + + /* Start our transmit queue. */ + netif_start_queue(dev); + + netif_carrier_on(dev); + + return 0; + +fail: + if (priv->loopify_channel >= 0) { + if (gxio_mpipe_link_close(&priv->loopify_link) != 0) + netdev_warn(dev, "Failed to close loopify link!\n"); + priv->loopify_channel = -1; + } + if (priv->channel >= 0) { + if (gxio_mpipe_link_close(&priv->link) != 0) + netdev_warn(dev, "Failed to close link!\n"); + priv->channel = -1; + } + + priv->echannel = -1; + + tile_net_devs_for_channel[priv->channel] = NULL; + + mutex_unlock(&tile_net_devs_for_channel_mutex); + + /* Don't return raw gxio error codes to generic Linux. */ + return (rc > -512) ? rc : -EIO; +} + +/* Help the kernel deactivate the given network interface. */ +static int tile_net_stop(struct net_device *dev) +{ + struct tile_net_priv *priv = netdev_priv(dev); + + /* Stop our transmit queue. */ + netif_stop_queue(dev); + + mutex_lock(&tile_net_devs_for_channel_mutex); + + tile_net_devs_for_channel[priv->channel] = NULL; + + (void)tile_net_update(dev); + + if (priv->loopify_channel >= 0) { + if (gxio_mpipe_link_close(&priv->loopify_link) != 0) + netdev_warn(dev, "Failed to close loopify link!\n"); + priv->loopify_channel = -1; + } + + if (priv->channel >= 0) { + if (gxio_mpipe_link_close(&priv->link) != 0) + netdev_warn(dev, "Failed to close link!\n"); + priv->channel = -1; + } + + priv->echannel = -1; + + mutex_unlock(&tile_net_devs_for_channel_mutex); + + return 0; +} + +/* Determine the VA for a fragment. */ +static inline void *tile_net_frag_buf(skb_frag_t *f) +{ + unsigned long pfn = page_to_pfn(skb_frag_page(f)); + return pfn_to_kaddr(pfn) + f->page_offset; +} + +/* Used for paranoia to make sure we handle no ill-formed packets. */ +#define TSO_DROP_IF(cond) \ + do { if (WARN_ON(cond)) return NETDEV_TX_OK; } while (0) + + +/* This function takes "skb", consisting of a header template and a + * (presumably) huge payload, and egresses it as one or more segments + * (aka packets), each consisting of a (possibly modified) copy of the + * header plus a piece of the payload, via "tcp segmentation offload". + * + * Usually, "data" will contain the header template, of size "sh_len", + * and "sh->frags" will contain "skb->data_len" bytes of payload, and + * there will be "sh->gso_segs" segments. + * + * Sometimes, if "sendfile()" requires copying, we will be called with + * "data" containing the header and payload, with "frags" being empty. + * + * Sometimes, for example when using NFS over TCP, a single segment can + * span 3 fragments. This requires special care below. + * + * See "emulate_large_send_offload()" for some reference code, which + * does not handle checksumming. + */ +static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev) +{ + struct tile_net_priv *priv = netdev_priv(dev); + + struct tile_net_info *info = &__get_cpu_var(per_cpu_info); + + struct tile_net_egress *egress = &egress_for_echannel[priv->echannel]; + gxio_mpipe_equeue_t *equeue = egress->equeue; + + struct tile_net_comps *comps = + info->comps_for_echannel[priv->echannel]; + + unsigned int len = skb->len; + unsigned char *data = skb->data; + + /* The ip header follows the ethernet header. */ + struct iphdr *ih = ip_hdr(skb); + unsigned int ih_len = ih->ihl * 4; + + /* Note that "nh == iph", by definition. */ + unsigned char *nh = skb_network_header(skb); + unsigned int eh_len = nh - data; + + /* The tcp header follows the ip header. */ + struct tcphdr *th = (struct tcphdr *)(nh + ih_len); + unsigned int th_len = th->doff * 4; + + /* The total number of header bytes. */ + unsigned int sh_len = eh_len + ih_len + th_len; + + /* Help compute "jh->check". */ + unsigned int isum_hack = + ((0xFFFF - ih->check) + + (0xFFFF - ih->tot_len) + + (0xFFFF - ih->id)); + + /* Help compute "uh->check". */ + unsigned int tsum_hack = th->check + (0xFFFF ^ htons(len)); + + struct skb_shared_info *sh = skb_shinfo(skb); + + /* The maximum payload size. */ + unsigned int gso_size = sh->gso_size; + + /* The size of the initial segments (including header). */ + unsigned int mtu = sh_len + gso_size; + + /* The size of the final segment (including header). */ + unsigned int mtu2 = len - ((sh->gso_segs - 1) * gso_size); + + /* Track tx stats. */ + unsigned int tx_packets = 0; + unsigned int tx_bytes = 0; + + /* Which segment are we on. */ + unsigned int segment; + + /* Get the initial ip "id". */ + u16 id = ntohs(ih->id); + + /* Get the initial tcp "seq". */ + u32 seq = ntohl(th->seq); + + /* The id of the current fragment (or -1). */ + long f_id; + + /* The size of the current fragment (or -1). */ + long f_size; + + /* The bytes used from the current fragment (or -1). */ + long f_used; + + /* The size of the current piece of payload. */ + long n; + + /* Prepare checksum info. */ + unsigned int csum_start = skb_checksum_start_offset(skb); + + /* The header/payload edesc's. */ + gxio_mpipe_edesc_t edesc_head = { { 0 } }; + gxio_mpipe_edesc_t edesc_body = { { 0 } }; + + /* Total number of edescs needed. */ + unsigned int num_edescs = 0; + + unsigned long irqflags; + + /* First reserved egress slot. */ + s64 slot; + + /* Empty packets (etc) would cause trouble below. */ + TSO_DROP_IF(skb->data_len == 0); + TSO_DROP_IF(sh->nr_frags == 0); + TSO_DROP_IF(sh->gso_segs == 0); + + /* We assume the frags contain the entire payload. */ + TSO_DROP_IF(skb_headlen(skb) != sh_len); + TSO_DROP_IF(len != sh_len + skb->data_len); + + /* Implicitly verify "gso_segs" and "gso_size". */ + TSO_DROP_IF(mtu2 > mtu); + + /* We only have HEADER_BYTES for each header. */ + TSO_DROP_IF(NET_IP_ALIGN + sh_len > HEADER_BYTES); + + /* Paranoia. */ + TSO_DROP_IF(skb->protocol != htons(ETH_P_IP)); + TSO_DROP_IF(ih->protocol != IPPROTO_TCP); + TSO_DROP_IF(skb->ip_summed != CHECKSUM_PARTIAL); + TSO_DROP_IF(csum_start != eh_len + ih_len); + + /* Prepare to egress the headers. */ + edesc_head.csum = 1; + edesc_head.csum_start = csum_start; + edesc_head.csum_dest = csum_start + skb->csum_offset; + edesc_head.xfer_size = sh_len; + + /* This is only used to specify the TLB. */ + edesc_head.stack_idx = large_buffer_stack; + edesc_body.stack_idx = large_buffer_stack; + + /* Reset. */ + f_id = -1; + f_size = -1; + f_used = -1; + + /* Determine how many edesc's are needed. */ + for (segment = 0; segment < sh->gso_segs; segment++) { + + /* Detect the final segment. */ + bool final = (segment == sh->gso_segs - 1); + + /* The segment size (including header). */ + unsigned int s_len = final ? mtu2 : mtu; + + /* The size of the payload. */ + unsigned int p_len = s_len - sh_len; + + /* The bytes used from the payload. */ + unsigned int p_used = 0; + + /* One edesc for the header. */ + num_edescs++; + + /* One edesc for each piece of the payload. */ + while (p_used < p_len) { + + /* Advance as needed. */ + while (f_used >= f_size) { + f_id++; + f_size = sh->frags[f_id].size; + f_used = 0; + } + + /* Use bytes from the current fragment. */ + n = p_len - p_used; + if (n > f_size - f_used) + n = f_size - f_used; + f_used += n; + p_used += n; + + num_edescs++; + } + } + + /* Verify all fragments consumed. */ + TSO_DROP_IF(f_id + 1 != sh->nr_frags); + TSO_DROP_IF(f_used != f_size); + + local_irq_save(irqflags); + + /* See comment in tile_net_tx(). */ + slot = gxio_mpipe_equeue_try_reserve(equeue, num_edescs); + if (slot < 0) { + local_irq_restore(irqflags); + return NETDEV_TX_BUSY; + } + + /* Reset. */ + f_id = -1; + f_size = -1; + f_used = -1; + + /* Prepare all the headers. */ + for (segment = 0; segment < sh->gso_segs; segment++) { + + /* Detect the final segment. */ + bool final = (segment == sh->gso_segs - 1); + + /* The segment size (including header). */ + unsigned int s_len = final ? mtu2 : mtu; + + /* The size of the payload. */ + unsigned int p_len = s_len - sh_len; + + /* The bytes used from the payload. */ + unsigned int p_used = 0; + + /* Access the header memory for this segment. */ + unsigned int bn = slot % EQUEUE_ENTRIES; + unsigned char *buf = + egress->headers + bn * HEADER_BYTES + NET_IP_ALIGN; + + /* The soon-to-be copied "ip" header. */ + struct iphdr *jh = (struct iphdr *)(buf + eh_len); + + /* The soon-to-be copied "tcp" header. */ + struct tcphdr *uh = (struct tcphdr *)(buf + eh_len + ih_len); + + unsigned int jsum; + + /* Copy the header. */ + memcpy(buf, data, sh_len); + + /* The packet size, not including ethernet header. */ + jh->tot_len = htons(s_len - eh_len); + + /* Update the ip "id". */ + jh->id = htons(id); + + /* Compute the "ip checksum". */ + jsum = isum_hack + htons(s_len - eh_len) + htons(id); + jh->check = csum_long(jsum) ^ 0xffff; + + /* Update the tcp "seq". */ + uh->seq = htonl(seq); + + /* Update some flags. */ + if (!final) { + uh->fin = 0; + uh->psh = 0; + } + + /* Compute the tcp pseudo-header checksum. */ + uh->check = csum_long(tsum_hack + htons(s_len)); + + /* Skip past the header. */ + slot++; + + /* Skip past the payload. */ + while (p_used < p_len) { + + /* Advance as needed. */ + while (f_used >= f_size) { + f_id++; + f_size = sh->frags[f_id].size; + f_used = 0; + } + + /* Use bytes from the current fragment. */ + n = p_len - p_used; + if (n > f_size - f_used) + n = f_size - f_used; + f_used += n; + p_used += n; + + slot++; + } + + id++; + seq += p_len; + } + + /* Reset "slot". */ + slot -= num_edescs; + + /* Flush the headers. */ + wmb(); + + /* Reset. */ + f_id = -1; + f_size = -1; + f_used = -1; + + /* Egress all the edescs. */ + for (segment = 0; segment < sh->gso_segs; segment++) { + + /* Detect the final segment. */ + bool final = (segment == sh->gso_segs - 1); + + /* The segment size (including header). */ + unsigned int s_len = final ? mtu2 : mtu; + + /* The size of the payload. */ + unsigned int p_len = s_len - sh_len; + + /* The bytes used from the payload. */ + unsigned int p_used = 0; + + /* Access the header memory for this segment. */ + unsigned int bn = slot % EQUEUE_ENTRIES; + unsigned char *buf = + egress->headers + bn * HEADER_BYTES + NET_IP_ALIGN; + + void *va; + + /* Egress the header. */ + edesc_head.va = va_to_tile_io_addr(buf); + gxio_mpipe_equeue_put_at(equeue, edesc_head, slot); + slot++; + + /* Egress the payload. */ + while (p_used < p_len) { + + /* Advance as needed. */ + while (f_used >= f_size) { + f_id++; + f_size = sh->frags[f_id].size; + f_used = 0; + } + + va = tile_net_frag_buf(&sh->frags[f_id]) + f_used; + + /* Use bytes from the current fragment. */ + n = p_len - p_used; + if (n > f_size - f_used) + n = f_size - f_used; + f_used += n; + p_used += n; + + /* Egress a piece of the payload. */ + edesc_body.va = va_to_tile_io_addr(va); + edesc_body.xfer_size = n; + edesc_body.bound = !(p_used < p_len); + gxio_mpipe_equeue_put_at(equeue, edesc_body, slot); + slot++; + } + + tx_packets++; + tx_bytes += s_len; + } + + /* Add a completion record. */ + add_comp(equeue, comps, slot - 1, skb); + + /* Update stats. */ + tile_net_stats_add(tx_packets, &priv->stats.tx_packets); + tile_net_stats_add(tx_bytes, &priv->stats.tx_bytes); + + local_irq_restore(irqflags); + + /* Make sure the egress timer is scheduled. */ + tile_net_schedule_egress_timer(info); + + return NETDEV_TX_OK; +} + +/* Analyze the body and frags for a transmit request. */ +static unsigned int tile_net_tx_frags(struct frag *frags, + struct sk_buff *skb, + void *b_data, unsigned int b_len) +{ + unsigned int i, n = 0; + + struct skb_shared_info *sh = skb_shinfo(skb); + + if (b_len != 0) { + frags[n].buf = b_data; + frags[n++].length = b_len; + } + + for (i = 0; i < sh->nr_frags; i++) { + skb_frag_t *f = &sh->frags[i]; + frags[n].buf = tile_net_frag_buf(f); + frags[n++].length = skb_frag_size(f); + } + + return n; +} + +/* Help the kernel transmit a packet. */ +static int tile_net_tx(struct sk_buff *skb, struct net_device *dev) +{ + struct tile_net_priv *priv = netdev_priv(dev); + struct tile_net_info *info = &__get_cpu_var(per_cpu_info); + struct tile_net_egress *egress = &egress_for_echannel[priv->echannel]; + gxio_mpipe_equeue_t *equeue = egress->equeue; + struct tile_net_comps *comps = + info->comps_for_echannel[priv->echannel]; + struct skb_shared_info *sh = skb_shinfo(skb); + unsigned int len = skb->len; + unsigned char *data = skb->data; + unsigned int num_frags; + struct frag frags[MAX_FRAGS]; + gxio_mpipe_edesc_t edescs[MAX_FRAGS]; + unsigned long irqflags; + gxio_mpipe_edesc_t edesc = { { 0 } }; + unsigned int i; + s64 slot; + + /* Save the timestamp. */ + dev->trans_start = jiffies; + + if (sh->gso_size != 0) + return tile_net_tx_tso(skb, dev); + + /* NOTE: This is usually 2, sometimes 3, for big writes. */ + num_frags = tile_net_tx_frags(frags, skb, data, skb_headlen(skb)); + + /* This is only used to specify the TLB. */ + edesc.stack_idx = large_buffer_stack; + + /* Prepare the edescs. */ + for (i = 0; i < num_frags; i++) { + edesc.xfer_size = frags[i].length; + edesc.va = va_to_tile_io_addr(frags[i].buf); + edescs[i] = edesc; + } + + /* Mark the final edesc. */ + edescs[num_frags - 1].bound = 1; + + /* Add checksum info to the initial edesc, if needed. */ + if (skb->ip_summed == CHECKSUM_PARTIAL) { + unsigned int csum_start = skb->csum_start - skb_headroom(skb); + edescs[0].csum = 1; + edescs[0].csum_start = csum_start; + edescs[0].csum_dest = csum_start + skb->csum_offset; + } + + local_irq_save(irqflags); + + /* Try to reserve slots for egress. If we fail due to the + * queue being full, we return NETDEV_TX_BUSY. This may lead + * to "Virtual device xxx asks to queue packet" warnings. + * + * We might consider retrying briefly here since We expect in + * principle that egress slots become available quickly as the + * hardware engine drains packets into the network. + * + * FIXME (bug# 9593): We should stop queues when they're full. + * We may want to consider making tile_net be multiqueue with + * one TX queue per CPU and ndo_select_queue defined + * accordingly. Initially we saw bad things happen when + * stopping the queue, so we are continuing to work on this + * for a future fix. + */ + slot = gxio_mpipe_equeue_try_reserve(equeue, num_frags); + if (slot < 0) { + local_irq_restore(irqflags); + return NETDEV_TX_BUSY; + } + + for (i = 0; i < num_frags; i++) + gxio_mpipe_equeue_put_at(equeue, edescs[i], slot++); + + /* Add a completion record. */ + add_comp(equeue, comps, slot - 1, skb); + + /* HACK: Track "expanded" size for short packets (e.g. 42 < 60). */ + tile_net_stats_add(1, &priv->stats.tx_packets); + tile_net_stats_add((len >= ETH_ZLEN) ? len : ETH_ZLEN, + &priv->stats.tx_bytes); + + local_irq_restore(irqflags); + + /* Make sure the egress timer is scheduled. */ + tile_net_schedule_egress_timer(info); + + return NETDEV_TX_OK; +} + +/* Deal with a transmit timeout. */ +static void tile_net_tx_timeout(struct net_device *dev) +{ + /* ISSUE: This doesn't seem useful for us. */ + netif_wake_queue(dev); +} + +/* Ioctl commands. */ +static int tile_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +{ + return -EOPNOTSUPP; +} + +/* Get system network statistics for device. */ +static struct net_device_stats *tile_net_get_stats(struct net_device *dev) +{ + struct tile_net_priv *priv = netdev_priv(dev); + return &priv->stats; +} + +/* Change the MTU. */ +static int tile_net_change_mtu(struct net_device *dev, int new_mtu) +{ + /* Check ranges. */ + if ((new_mtu < 68) || (new_mtu > 1500)) + return -EINVAL; + + /* Accept the value. */ + dev->mtu = new_mtu; + + return 0; +} + +/* Change the Ethernet address of the NIC. + * + * The hypervisor driver does not support changing MAC address. However, + * the hardware does not do anything with the MAC address, so the address + * which gets used on outgoing packets, and which is accepted on incoming + * packets, is completely up to us. + * + * Returns 0 on success, negative on failure. + */ +static int tile_net_set_mac_address(struct net_device *dev, void *p) +{ + struct sockaddr *addr = p; + + if (!is_valid_ether_addr(addr->sa_data)) + return -EINVAL; + + memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); + + return 0; +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +/* Polling 'interrupt' - used by things like netconsole to send skbs + * without having to re-enable interrupts. It's not called while + * the interrupt routine is executing. + */ +static void tile_net_netpoll(struct net_device *dev) +{ + disable_percpu_irq(ingress_irq); + tile_net_handle_ingress_irq(ingress_irq, NULL); + enable_percpu_irq(ingress_irq, 0); +} +#endif + +static const struct net_device_ops tile_net_ops = { + .ndo_open = tile_net_open, + .ndo_stop = tile_net_stop, + .ndo_start_xmit = tile_net_tx, + .ndo_do_ioctl = tile_net_ioctl, + .ndo_get_stats = tile_net_get_stats, + .ndo_change_mtu = tile_net_change_mtu, + .ndo_tx_timeout = tile_net_tx_timeout, + .ndo_set_mac_address = tile_net_set_mac_address, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = tile_net_netpoll, +#endif +}; + +/* The setup function. + * + * This uses ether_setup() to assign various fields in dev, including + * setting IFF_BROADCAST and IFF_MULTICAST, then sets some extra fields. + */ +static void tile_net_setup(struct net_device *dev) +{ + ether_setup(dev); + + dev->netdev_ops = &tile_net_ops; + dev->watchdog_timeo = TILE_NET_TIMEOUT; + + /* We want lockless xmit. */ + dev->features |= NETIF_F_LLTX; + + /* We support hardware tx checksums. */ + dev->features |= NETIF_F_HW_CSUM; + + /* We support scatter/gather. */ + dev->features |= NETIF_F_SG; + + /* We support TSO. */ + dev->features |= NETIF_F_TSO; + + dev->tx_queue_len = 0; + + dev->mtu = 1500; +} + +/* Allocate the device structure, register the device, and obtain the + * MAC address from the hypervisor. + */ +static void tile_net_dev_init(const char *name, const uint8_t *mac) +{ + int ret; + int i; + int nz_addr = 0; + struct net_device *dev; + struct tile_net_priv *priv; + + /* HACK: Ignore "loop" links. */ + if (strncmp(name, "loop", 4) == 0) + return; + + /* Allocate the device structure. This allocates "priv", calls + * tile_net_setup(), and saves "name". Normally, "name" is a + * template, instantiated by register_netdev(), but not for us. + */ + dev = alloc_netdev(sizeof(*priv), name, tile_net_setup); + if (!dev) { + pr_err("alloc_netdev(%s) failed\n", name); + return; + } + + priv = netdev_priv(dev); + + /* Initialize "priv". */ + + memset(priv, 0, sizeof(*priv)); + + priv->dev = dev; + + priv->channel = -1; + priv->loopify_channel = -1; + priv->echannel = -1; + + /* Get the MAC address and set it in the device struct; this must + * be done before the device is opened. If the MAC is all zeroes, + * we use a random address, since we're probably on the simulator. + */ + for (i = 0; i < 6; i++) + nz_addr |= mac[i]; + + if (nz_addr) { + memcpy(dev->dev_addr, mac, 6); + dev->addr_len = 6; + } else { + random_ether_addr(dev->dev_addr); + } + + /* Register the network device. */ + ret = register_netdev(dev); + if (ret) { + netdev_err(dev, "register_netdev failed %d\n", ret); + free_netdev(dev); + return; + } +} + +/* Module initialization. */ +static int __init tile_net_init_module(void) +{ + int i; + char name[GXIO_MPIPE_LINK_NAME_LEN]; + uint8_t mac[6]; + + pr_info("Tilera Network Driver\n"); + + mutex_init(&tile_net_devs_for_channel_mutex); + + /* Initialize each CPU. */ + on_each_cpu(tile_net_prepare_cpu, NULL, 1); + + /* Find out what devices we have, and initialize them. */ + for (i = 0; gxio_mpipe_link_enumerate_mac(i, name, mac) >= 0; i++) + tile_net_dev_init(name, mac); + + if (!network_cpus_init()) + network_cpus_map = *cpu_online_mask; + + return 0; +} + +module_init(tile_net_init_module); -- 1.6.5.2