diff options
Diffstat (limited to 'drivers/net/ethernet/tile/tilepro.c')
| -rw-r--r-- | drivers/net/ethernet/tile/tilepro.c | 2397 |
1 files changed, 0 insertions, 2397 deletions
diff --git a/drivers/net/ethernet/tile/tilepro.c b/drivers/net/ethernet/tile/tilepro.c deleted file mode 100644 index 56d06282fbde..000000000000 --- a/drivers/net/ethernet/tile/tilepro.c +++ /dev/null @@ -1,2397 +0,0 @@ -/* - * Copyright 2011 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 <linux/module.h> -#include <linux/init.h> -#include <linux/moduleparam.h> -#include <linux/sched.h> -#include <linux/kernel.h> /* printk() */ -#include <linux/slab.h> /* kmalloc() */ -#include <linux/errno.h> /* error codes */ -#include <linux/types.h> /* size_t */ -#include <linux/interrupt.h> -#include <linux/in.h> -#include <linux/netdevice.h> /* struct device, and other headers */ -#include <linux/etherdevice.h> /* eth_type_trans */ -#include <linux/skbuff.h> -#include <linux/ioctl.h> -#include <linux/cdev.h> -#include <linux/hugetlb.h> -#include <linux/in6.h> -#include <linux/timer.h> -#include <linux/io.h> -#include <linux/u64_stats_sync.h> -#include <asm/checksum.h> -#include <asm/homecache.h> - -#include <hv/drv_xgbe_intf.h> -#include <hv/drv_xgbe_impl.h> -#include <hv/hypervisor.h> -#include <hv/netio_intf.h> - -/* For TSO */ -#include <linux/ip.h> -#include <linux/tcp.h> - - -/* - * First, "tile_net_init_module()" initializes all four "devices" which - * can be used by linux. - * - * Then, "ifconfig DEVICE up" calls "tile_net_open()", which analyzes - * the network cpus, then uses "tile_net_open_aux()" to initialize - * LIPP/LEPP, and then uses "tile_net_open_inner()" to register all - * the tiles, provide buffers to LIPP, allow ingress to start, and - * turn on hypervisor interrupt handling (and NAPI) on all tiles. - * - * If registration fails due to the link being down, then "retry_work" - * is used to keep calling "tile_net_open_inner()" until it succeeds. - * - * If "ifconfig DEVICE down" is called, it uses "tile_net_stop()" to - * stop egress, drain the LIPP buffers, unregister all the tiles, stop - * LIPP/LEPP, and wipe the LEPP queue. - * - * We start out with the ingress interrupt enabled on each CPU. When - * this interrupt fires, we disable it, and call "napi_schedule()". - * This will cause "tile_net_poll()" to be called, which will pull - * packets from the netio queue, filtering them out, or passing them - * to "netif_receive_skb()". If our budget is exhausted, we will - * return, knowing we will be called again later. Otherwise, we - * reenable the ingress interrupt, and call "napi_complete()". - * - * HACK: Since disabling the ingress interrupt is not reliable, we - * ignore the interrupt if the global "active" flag is false. - * - * - * NOTE: The use of "native_driver" ensures that EPP exists, and that - * we are using "LIPP" and "LEPP". - * - * NOTE: Failing to free completions for an arbitrarily long time - * (which is defined to be illegal) does in fact cause bizarre - * problems. The "egress_timer" helps prevent this from happening. - */ - - -/* HACK: Allow use of "jumbo" packets. */ -/* This should be 1500 if "jumbo" is not set in LIPP. */ -/* This should be at most 10226 (10240 - 14) if "jumbo" is set in LIPP. */ -/* ISSUE: This has not been thoroughly tested (except at 1500). */ -#define TILE_NET_MTU ETH_DATA_LEN - -/* HACK: Define this to verify incoming packets. */ -/* #define TILE_NET_VERIFY_INGRESS */ - -/* Use 3000 to enable the Linux Traffic Control (QoS) layer, else 0. */ -#define TILE_NET_TX_QUEUE_LEN 0 - -/* Define to dump packets (prints out the whole packet on tx and rx). */ -/* #define TILE_NET_DUMP_PACKETS */ - -/* Define to enable debug spew (all PDEBUG's are enabled). */ -/* #define TILE_NET_DEBUG */ - - -/* Define to activate paranoia checks. */ -/* #define TILE_NET_PARANOIA */ - -/* Default transmit lockup timeout period, in jiffies. */ -#define TILE_NET_TIMEOUT (5 * HZ) - -/* Default retry interval for bringing up the NetIO interface, in jiffies. */ -#define TILE_NET_RETRY_INTERVAL (5 * HZ) - -/* Number of ports (xgbe0, xgbe1, gbe0, gbe1). */ -#define TILE_NET_DEVS 4 - - - -/* Paranoia. */ -#if NET_IP_ALIGN != LIPP_PACKET_PADDING -#error "NET_IP_ALIGN must match LIPP_PACKET_PADDING." -#endif - - -/* Debug print. */ -#ifdef TILE_NET_DEBUG -#define PDEBUG(fmt, args...) net_printk(fmt, ## args) -#else -#define PDEBUG(fmt, args...) -#endif - - -MODULE_AUTHOR("Tilera"); -MODULE_LICENSE("GPL"); - - -/* - * Queue of incoming packets for a specific cpu and device. - * - * Includes a pointer to the "system" data, and the actual "user" data. - */ -struct tile_netio_queue { - netio_queue_impl_t *__system_part; - netio_queue_user_impl_t __user_part; - -}; - - -/* - * Statistics counters for a specific cpu and device. - */ -struct tile_net_stats_t { - struct u64_stats_sync syncp; - u64 rx_packets; /* total packets received */ - u64 tx_packets; /* total packets transmitted */ - u64 rx_bytes; /* total bytes received */ - u64 tx_bytes; /* total bytes transmitted */ - u64 rx_errors; /* packets truncated or marked bad by hw */ - u64 rx_dropped; /* packets not for us or intf not up */ -}; - - -/* - * Info for a specific cpu and device. - * - * ISSUE: There is a "dev" pointer in "napi" as well. - */ -struct tile_net_cpu { - /* The NAPI struct. */ - struct napi_struct napi; - /* Packet queue. */ - struct tile_netio_queue queue; - /* Statistics. */ - struct tile_net_stats_t stats; - /* True iff NAPI is enabled. */ - bool napi_enabled; - /* True if this tile has successfully registered with the IPP. */ - bool registered; - /* True if the link was down last time we tried to register. */ - bool link_down; - /* True if "egress_timer" is scheduled. */ - bool egress_timer_scheduled; - /* 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; -}; - - -/* - * Info for a specific device. - */ -struct tile_net_priv { - /* Our network device. */ - struct net_device *dev; - /* Pages making up the egress queue. */ - struct page *eq_pages; - /* Address of the actual egress queue. */ - lepp_queue_t *eq; - /* Protects "eq". */ - spinlock_t eq_lock; - /* The hypervisor handle for this interface. */ - int hv_devhdl; - /* The intr bit mask that IDs this device. */ - u32 intr_id; - /* True iff "tile_net_open_aux()" has succeeded. */ - bool partly_opened; - /* True iff the device is "active". */ - bool active; - /* Effective network cpus. */ - struct cpumask network_cpus_map; - /* Number of network cpus. */ - int network_cpus_count; - /* Credits per network cpu. */ - int network_cpus_credits; - /* For NetIO bringup retries. */ - struct delayed_work retry_work; - /* Quick access to per cpu data. */ - struct tile_net_cpu *cpu[NR_CPUS]; -}; - -/* Log2 of the number of small pages needed for the egress queue. */ -#define EQ_ORDER get_order(sizeof(lepp_queue_t)) -/* Size of the egress queue's pages. */ -#define EQ_SIZE (1 << (PAGE_SHIFT + EQ_ORDER)) - -/* - * The actual devices (xgbe0, xgbe1, gbe0, gbe1). - */ -static struct net_device *tile_net_devs[TILE_NET_DEVS]; - -/* - * The "tile_net_cpu" structures for each device. - */ -static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe0); -static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe1); -static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe0); -static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe1); - - -/* - * True if "network_cpus" was specified. - */ -static bool network_cpus_used; - -/* - * The actual cpus in "network_cpus". - */ -static struct cpumask network_cpus_map; - - - -#ifdef TILE_NET_DEBUG -/* - * printk with extra stuff. - * - * We print the CPU we're running in brackets. - */ -static void net_printk(char *fmt, ...) -{ - int i; - int len; - va_list args; - static char buf[256]; - - len = sprintf(buf, "tile_net[%2.2d]: ", smp_processor_id()); - va_start(args, fmt); - i = vscnprintf(buf + len, sizeof(buf) - len - 1, fmt, args); - va_end(args); - buf[255] = '\0'; - pr_notice(buf); -} -#endif - - -#ifdef TILE_NET_DUMP_PACKETS -/* - * Dump a packet. - */ -static void dump_packet(unsigned char *data, unsigned long length, char *s) -{ - int my_cpu = smp_processor_id(); - - unsigned long i; - char buf[128]; - - static unsigned int count; - - pr_info("dump_packet(data %p, length 0x%lx s %s count 0x%x)\n", - data, length, s, count++); - - pr_info("\n"); - - for (i = 0; i < length; i++) { - if ((i & 0xf) == 0) - sprintf(buf, "[%02d] %8.8lx:", my_cpu, i); - sprintf(buf + strlen(buf), " %2.2x", data[i]); - if ((i & 0xf) == 0xf || i == length - 1) { - strcat(buf, "\n"); - pr_info("%s", buf); - } - } -} -#endif - - -/* - * Provide support for the __netio_fastio1() swint - * (see <hv/drv_xgbe_intf.h> for how it is used). - * - * The fastio swint2 call may clobber all the caller-saved registers. - * It rarely clobbers memory, but we allow for the possibility in - * the signature just to be on the safe side. - * - * Also, gcc doesn't seem to allow an input operand to be - * clobbered, so we fake it with dummy outputs. - * - * This function can't be static because of the way it is declared - * in the netio header. - */ -inline int __netio_fastio1(u32 fastio_index, u32 arg0) -{ - long result, clobber_r1, clobber_r10; - asm volatile("swint2" - : "=R00" (result), - "=R01" (clobber_r1), "=R10" (clobber_r10) - : "R10" (fastio_index), "R01" (arg0) - : "memory", "r2", "r3", "r4", - "r5", "r6", "r7", "r8", "r9", - "r11", "r12", "r13", "r14", - "r15", "r16", "r17", "r18", "r19", - "r20", "r21", "r22", "r23", "r24", - "r25", "r26", "r27", "r28", "r29"); - return result; -} - - -static void tile_net_return_credit(struct tile_net_cpu *info) -{ - struct tile_netio_queue *queue = &info->queue; - netio_queue_user_impl_t *qup = &queue->__user_part; - - /* Return four credits after every fourth packet. */ - if (--qup->__receive_credit_remaining == 0) { - u32 interval = qup->__receive_credit_interval; - qup->__receive_credit_remaining = interval; - __netio_fastio_return_credits(qup->__fastio_index, interval); - } -} - - - -/* - * Provide a linux buffer to LIPP. - */ -static void tile_net_provide_linux_buffer(struct tile_net_cpu *info, - void *va, bool small) -{ - struct tile_netio_queue *queue = &info->queue; - - /* Convert "va" and "small" to "linux_buffer_t". */ - unsigned int buffer = ((unsigned int)(__pa(va) >> 7) << 1) + small; - - __netio_fastio_free_buffer(queue->__user_part.__fastio_index, buffer); -} - - -/* - * Provide a linux buffer for LIPP. - * - * Note that the ACTUAL allocation for each buffer is a "struct sk_buff", - * plus a chunk of memory that includes not only the requested bytes, but - * also NET_SKB_PAD bytes of initial padding, and a "struct skb_shared_info". - * - * Note that "struct skb_shared_info" is 88 bytes with 64K pages and - * 268 bytes with 4K pages (since the frags[] array needs 18 entries). - * - * Without jumbo packets, the maximum packet size will be 1536 bytes, - * and we use 2 bytes (NET_IP_ALIGN) of padding. ISSUE: If we told - * the hardware to clip at 1518 bytes instead of 1536 bytes, then we - * could save an entire cache line, but in practice, we don't need it. - * - * Since CPAs are 38 bits, and we can only encode the high 31 bits in - * a "linux_buffer_t", the low 7 bits must be zero, and thus, we must - * align the actual "va" mod 128. - * - * We assume that the underlying "head" will be aligned mod 64. Note - * that in practice, we have seen "head" NOT aligned mod 128 even when - * using 2048 byte allocations, which is surprising. - * - * If "head" WAS always aligned mod 128, we could change LIPP to - * assume that the low SIX bits are zero, and the 7th bit is one, that - * is, align the actual "va" mod 128 plus 64, which would be "free". - * - * For now, the actual "head" pointer points at NET_SKB_PAD bytes of - * padding, plus 28 or 92 bytes of extra padding, plus the sk_buff - * pointer, plus the NET_IP_ALIGN padding, plus 126 or 1536 bytes for - * the actual packet, plus 62 bytes of empty padding, plus some - * padding and the "struct skb_shared_info". - * - * With 64K pages, a large buffer thus needs 32+92+4+2+1536+62+88 - * bytes, or 1816 bytes, which fits comfortably into 2048 bytes. - * - * With 64K pages, a small buffer thus needs 32+92+4+2+126+88 - * bytes, or 344 bytes, which means we are wasting 64+ bytes, and - * could presumably increase the size of small buffers. - * - * With 4K pages, a large buffer thus needs 32+92+4+2+1536+62+268 - * bytes, or 1996 bytes, which fits comfortably into 2048 bytes. - * - * With 4K pages, a small buffer thus needs 32+92+4+2+126+268 - * bytes, or 524 bytes, which is annoyingly wasteful. - * - * Maybe we should increase LIPP_SMALL_PACKET_SIZE to 192? - * - * ISSUE: Maybe we should increase "NET_SKB_PAD" to 64? - */ -static bool tile_net_provide_needed_buffer(struct tile_net_cpu *info, - bool small) -{ -#if TILE_NET_MTU <= 1536 - /* Without "jumbo", 2 + 1536 should be sufficient. */ - unsigned int large_size = NET_IP_ALIGN + 1536; -#else - /* ISSUE: This has not been tested. */ - unsigned int large_size = NET_IP_ALIGN + TILE_NET_MTU + 100; -#endif - - /* Avoid "false sharing" with last cache line. */ - /* ISSUE: This is already done by "netdev_alloc_skb()". */ - unsigned int len = - (((small ? LIPP_SMALL_PACKET_SIZE : large_size) + - CHIP_L2_LINE_SIZE() - 1) & -CHIP_L2_LINE_SIZE()); - - unsigned int padding = 128 - NET_SKB_PAD; - unsigned int align; - - struct sk_buff *skb; - void *va; - - struct sk_buff **skb_ptr; - - /* Request 96 extra bytes for alignment purposes. */ - skb = netdev_alloc_skb(info->napi.dev, len + padding); - if (skb == NULL) - return false; - - /* Skip 32 or 96 bytes to align "data" mod 128. */ - align = -(long)skb->data & (128 - 1); - BUG_ON(align > padding); - skb_reserve(skb, align); - - /* This address is given to IPP. */ - va = skb->data; - - /* Buffers must not span a huge page. */ - BUG_ON(((((long)va & ~HPAGE_MASK) + len) & HPAGE_MASK) != 0); - -#ifdef TILE_NET_PARANOIA -#if CHIP_HAS_CBOX_HOME_MAP() - if (hash_default) { - HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)va); - if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3) - panic("Non-HFH ingress buffer! VA=%p Mode=%d PTE=%llx", - va, hv_pte_get_mode(pte), hv_pte_val(pte)); - } -#endif -#endif - - /* Invalidate the packet buffer. */ - if (!hash_default) - __inv_buffer(va, len); - - /* Skip two bytes to satisfy LIPP assumptions. */ - /* Note that this aligns IP on a 16 byte boundary. */ - /* ISSUE: Do this when the packet arrives? */ - skb_reserve(skb, NET_IP_ALIGN); - - /* Save a back-pointer to 'skb'. */ - skb_ptr = va - sizeof(*skb_ptr); - *skb_ptr = skb; - - /* Make sure "skb_ptr" has been flushed. */ - __insn_mf(); - - /* Provide the new buffer. */ - tile_net_provide_linux_buffer(info, va, small); - - return true; -} - - -/* - * Provide linux buffers for LIPP. - */ -static void tile_net_provide_needed_buffers(struct tile_net_cpu *info) -{ - while (info->num_needed_small_buffers != 0) { - if (!tile_net_provide_needed_buffer(info, true)) - goto oops; - info->num_needed_small_buffers--; - } - - while (info->num_needed_large_buffers != 0) { - if (!tile_net_provide_needed_buffer(info, false)) - goto oops; - info->num_needed_large_buffers--; - } - - return; - -oops: - - /* Add a description to the page allocation failure dump. */ - pr_notice("Could not provide a linux buffer to LIPP.\n"); -} - - -/* - * Grab some LEPP completions, and store them in "comps", of size - * "comps_size", and return the number of completions which were - * stored, so the caller can free them. - */ -static unsigned int tile_net_lepp_grab_comps(lepp_queue_t *eq, - struct sk_buff *comps[], - unsigned int comps_size, - unsigned int min_size) -{ - unsigned int n = 0; - - unsigned int comp_head = eq->comp_head; - unsigned int comp_busy = eq->comp_busy; - - while (comp_head != comp_busy && n < comps_size) { - comps[n++] = eq->comps[comp_head]; - LEPP_QINC(comp_head); - } - - if (n < min_size) - return 0; - - eq->comp_head = comp_head; - - return n; -} - - -/* - * Free some comps, and return true iff there are still some pending. - */ -static bool tile_net_lepp_free_comps(struct net_device *dev, bool all) -{ - struct tile_net_priv *priv = netdev_priv(dev); - - lepp_queue_t *eq = priv->eq; - - struct sk_buff *olds[64]; - unsigned int wanted = 64; - unsigned int i, n; - bool pending; - - spin_lock(&priv->eq_lock); - - if (all) - eq->comp_busy = eq->comp_tail; - - n = tile_net_lepp_grab_comps(eq, olds, wanted, 0); - - pending = (eq->comp_head != eq->comp_tail); - - spin_unlock(&priv->eq_lock); - - for (i = 0; i < n; i++) - kfree_skb(olds[i]); - - return pending; -} - - -/* - * 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_cpu *info) -{ - if (!info->egress_timer_scheduled) { - mod_timer(&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 (on behalf of any tile). - * - * ISSUE: Realistically, will the timer ever stop scheduling itself? - * - * ISSUE: This timer is almost never actually needed, so just use a global - * timer that can run on any tile. - * - * ISSUE: Maybe instead track number of expected completions, and free - * only that many, resetting to zero if "pending" is ever false. - */ -static void tile_net_handle_egress_timer(struct timer_list *t) -{ - struct tile_net_cpu *info = from_timer(info, t, egress_timer); - struct net_device *dev = info->napi.dev; - - /* The timer is no longer scheduled. */ - info->egress_timer_scheduled = false; - - /* Free comps, and reschedule timer if more are pending. */ - if (tile_net_lepp_free_comps(dev, false)) - tile_net_schedule_egress_timer(info); -} - - -static void tile_net_discard_aux(struct tile_net_cpu *info, int index) -{ - struct tile_netio_queue *queue = &info->queue; - netio_queue_impl_t *qsp = queue->__system_part; - netio_queue_user_impl_t *qup = &queue->__user_part; - - int index2_aux = index + sizeof(netio_pkt_t); - int index2 = - ((index2_aux == - qsp->__packet_receive_queue.__last_packet_plus_one) ? - 0 : index2_aux); - - netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index); - - /* Extract the "linux_buffer_t". */ - unsigned int buffer = pkt->__packet.word; - - /* Convert "linux_buffer_t" to "va". */ - void *va = __va((phys_addr_t)(buffer >> 1) << 7); - - /* Acquire the associated "skb". */ - struct sk_buff **skb_ptr = va - sizeof(*skb_ptr); - struct sk_buff *skb = *skb_ptr; - - kfree_skb(skb); - - /* Consume this packet. */ - qup->__packet_receive_read = index2; -} - - -/* - * Like "tile_net_poll()", but just discard packets. - */ -static void tile_net_discard_packets(struct net_device *dev) -{ - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info = priv->cpu[my_cpu]; - struct tile_netio_queue *queue = &info->queue; - netio_queue_impl_t *qsp = queue->__system_part; - netio_queue_user_impl_t *qup = &queue->__user_part; - - while (qup->__packet_receive_read != - qsp->__packet_receive_queue.__packet_write) { - int index = qup->__packet_receive_read; - tile_net_discard_aux(info, index); - } -} - - -/* - * Handle the next packet. Return true if "processed", false if "filtered". - */ -static bool tile_net_poll_aux(struct tile_net_cpu *info, int index) -{ - struct net_device *dev = info->napi.dev; - - struct tile_netio_queue *queue = &info->queue; - netio_queue_impl_t *qsp = queue->__system_part; - netio_queue_user_impl_t *qup = &queue->__user_part; - struct tile_net_stats_t *stats = &info->stats; - - int filter; - - int index2_aux = index + sizeof(netio_pkt_t); - int index2 = - ((index2_aux == - qsp->__packet_receive_queue.__last_packet_plus_one) ? - 0 : index2_aux); - - netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index); - - netio_pkt_metadata_t *metadata = NETIO_PKT_METADATA(pkt); - netio_pkt_status_t pkt_status = NETIO_PKT_STATUS_M(metadata, pkt); - - /* Extract the packet size. FIXME: Shouldn't the second line */ - /* get subtracted? Mostly moot, since it should be "zero". */ - unsigned long len = - (NETIO_PKT_CUSTOM_LENGTH(pkt) + - NET_IP_ALIGN - NETIO_PACKET_PADDING); - - /* Extract the "linux_buffer_t". */ - unsigned int buffer = pkt->__packet.word; - - /* Extract "small" (vs "large"). */ - bool small = ((buffer & 1) != 0); - - /* Convert "linux_buffer_t" to "va". */ - void *va = __va((phys_addr_t)(buffer >> 1) << 7); - - /* Extract the packet data pointer. */ - /* Compare to "NETIO_PKT_CUSTOM_DATA(pkt)". */ - unsigned char *buf = va + NET_IP_ALIGN; - - /* Invalidate the packet buffer. */ - if (!hash_default) - __inv_buffer(buf, len); - -#ifdef TILE_NET_DUMP_PACKETS - dump_packet(buf, len, "rx"); -#endif /* TILE_NET_DUMP_PACKETS */ - -#ifdef TILE_NET_VERIFY_INGRESS - if (pkt_status == NETIO_PKT_STATUS_OVERSIZE && len >= 64) { - dump_packet(buf, len, "rx"); - panic("Unexpected OVERSIZE."); - } -#endif - - filter = 0; - - if (pkt_status == NETIO_PKT_STATUS_BAD) { - /* Handle CRC error and hardware truncation. */ - filter = 2; - } else if (!(dev->flags & IFF_UP)) { - /* Filter packets received before we're up. */ - filter = 1; - } else if (NETIO_PKT_ETHERTYPE_RECOGNIZED_M(metadata, pkt) && - pkt_status == NETIO_PKT_STATUS_UNDERSIZE) { - /* Filter "truncated" packets. */ - filter = 2; - } else if (!(dev->flags & IFF_PROMISC)) { - if (!is_multicast_ether_addr(buf)) { - /* Filter packets not for our address. */ - const u8 *mine = dev->dev_addr; - filter = !ether_addr_equal(mine, buf); - } - } - - u64_stats_update_begin(&stats->syncp); - - if (filter != 0) { - - if (filter == 1) - stats->rx_dropped++; - else - stats->rx_errors++; - - tile_net_provide_linux_buffer(info, va, small); - - } else { - - /* Acquire the associated "skb". */ - struct sk_buff **skb_ptr = va - sizeof(*skb_ptr); - struct sk_buff *skb = *skb_ptr; - - /* Paranoia. */ - if (skb->data != buf) - panic("Corrupt linux buffer from LIPP! " - "VA=%p, skb=%p, skb->data=%p\n", - va, skb, skb->data); - - /* Encode the actual packet length. */ - skb_put(skb, len); - - /* NOTE: This call also sets "skb->dev = dev". */ - skb->protocol = eth_type_trans(skb, dev); - - /* Avoid recomputing "good" TCP/UDP checksums. */ - if (NETIO_PKT_L4_CSUM_CORRECT_M(metadata, pkt)) - skb->ip_summed = CHECKSUM_UNNECESSARY; - - netif_receive_skb(skb); - - stats->rx_packets++; - stats->rx_bytes += len; - } - - u64_stats_update_end(&stats->syncp); - - /* ISSUE: It would be nice to defer this until the packet has */ - /* actually been processed. */ - tile_net_return_credit(info); - - /* Consume this packet. */ - qup->__packet_receive_read = index2; - - return !filter; -} - - -/* - * Handle some packets for the given device on the current CPU. - * - * If "tile_net_stop()" is called on some other tile while this - * function is running, we will return, hopefully before that - * other tile asks us to call "napi_disable()". - * - * The "rotting packet" race condition occurs if a packet arrives - * during the extremely narrow window between the queue appearing to - * be empty, and the ingress interrupt being re-enabled. This happens - * a LOT under heavy network load. - */ -static int tile_net_poll(struct napi_struct *napi, int budget) -{ - struct net_device *dev = napi->dev; - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info = priv->cpu[my_cpu]; - struct tile_netio_queue *queue = &info->queue; - netio_queue_impl_t *qsp = queue->__system_part; - netio_queue_user_impl_t *qup = &queue->__user_part; - - unsigned int work = 0; - - if (budget <= 0) - goto done; - - while (priv->active) { - int index = qup->__packet_receive_read; - if (index == qsp->__packet_receive_queue.__packet_write) - break; - - if (tile_net_poll_aux(info, index)) { - if (++work >= budget) - goto done; - } - } - - napi_complete_done(&info->napi, work); - - if (!priv->active) - goto done; - - /* Re-enable the ingress interrupt. */ - enable_percpu_irq(priv->intr_id, 0); - - /* HACK: Avoid the "rotting packet" problem (see above). */ - if (qup->__packet_receive_read != - qsp->__packet_receive_queue.__packet_write) { - /* ISSUE: Sometimes this returns zero, presumably */ - /* because an interrupt was handled for this tile. */ - (void)napi_reschedule(&info->napi); - } - -done: - - if (priv->active) - tile_net_provide_needed_buffers(info); - - return work; -} - - -/* - * Handle an ingress interrupt for the given device on the current cpu. - * - * ISSUE: Sometimes this gets called after "disable_percpu_irq()" has - * been called! This is probably due to "pending hypervisor downcalls". - * - * ISSUE: Is there any race condition between the "napi_schedule()" here - * and the "napi_complete()" call above? - */ -static irqreturn_t tile_net_handle_ingress_interrupt(int irq, void *dev_ptr) -{ - struct net_device *dev = (struct net_device *)dev_ptr; - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info = priv->cpu[my_cpu]; - - /* Disable the ingress interrupt. */ - disable_percpu_irq(priv->intr_id); - - /* Ignore unwanted interrupts. */ - if (!priv->active) - return IRQ_HANDLED; - - /* ISSUE: Sometimes "info->napi_enabled" is false here. */ - - napi_schedule(&info->napi); - - return IRQ_HANDLED; -} - - -/* - * One time initialization per interface. - */ -static int tile_net_open_aux(struct net_device *dev) -{ - struct tile_net_priv *priv = netdev_priv(dev); - - int ret; - int dummy; - unsigned int epp_lotar; - - /* - * Find out where EPP memory should be homed. - */ - ret = hv_dev_pread(priv->hv_devhdl, 0, - (HV_VirtAddr)&epp_lotar, sizeof(epp_lotar), - NETIO_EPP_SHM_OFF); - if (ret < 0) { - pr_err("could not read epp_shm_queue lotar.\n"); - return -EIO; - } - - /* - * Home the page on the EPP. - */ - { - int epp_home = hv_lotar_to_cpu(epp_lotar); - homecache_change_page_home(priv->eq_pages, EQ_ORDER, epp_home); - } - - /* - * Register the EPP shared memory queue. - */ - { - netio_ipp_address_t ea = { - .va = 0, - .pa = __pa(priv->eq), - .pte = hv_pte(0), - .size = EQ_SIZE, - }; - ea.pte = hv_pte_set_lotar(ea.pte, epp_lotar); - ea.pte = hv_pte_set_mode(ea.pte, HV_PTE_MODE_CACHE_TILE_L3); - ret = hv_dev_pwrite(priv->hv_devhdl, 0, - (HV_VirtAddr)&ea, - sizeof(ea), - NETIO_EPP_SHM_OFF); - if (ret < 0) - return -EIO; - } - - /* - * Start LIPP/LEPP. - */ - if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy, - sizeof(dummy), NETIO_IPP_START_SHIM_OFF) < 0) { - pr_warn("Failed to start LIPP/LEPP\n"); - return -EIO; - } - - return 0; -} - - -/* - * Register with hypervisor on the current CPU. - * - * Strangely, this function does important things even if it "fails", - * which is especially common if the link is not up yet. Hopefully - * these things are all "harmless" if done twice! - */ -static void tile_net_register(void *dev_ptr) -{ - struct net_device *dev = (struct net_device *)dev_ptr; - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info; - - struct tile_netio_queue *queue; - - /* Only network cpus can receive packets. */ - int queue_id = - cpumask_test_cpu(my_cpu, &priv->network_cpus_map) ? 0 : 255; - - netio_input_config_t config = { - .flags = 0, - .num_receive_packets = priv->network_cpus_credits, - .queue_id = queue_id - }; - - int ret = 0; - netio_queue_impl_t *queuep; - - PDEBUG("tile_net_register(queue_id %d)\n", queue_id); - - if (!strcmp(dev->name, "xgbe0")) - info = this_cpu_ptr(&hv_xgbe0); - else if (!strcmp(dev->name, "xgbe1")) - info = this_cpu_ptr(&hv_xgbe1); - else if (!strcmp(dev->name, "gbe0")) - info = this_cpu_ptr(&hv_gbe0); - else if (!strcmp(dev->name, "gbe1")) - info = this_cpu_ptr(&hv_gbe1); - else - BUG(); - - /* Initialize the egress timer. */ - timer_setup(&info->egress_timer, tile_net_handle_egress_timer, - TIMER_PINNED); - - u64_stats_init(&info->stats.syncp); - - priv->cpu[my_cpu] = info; - - /* - * Register ourselves with LIPP. This does a lot of stuff, - * including invoking the LIPP registration code. - */ - ret = hv_dev_pwrite(priv->hv_devhdl, 0, - (HV_VirtAddr)&config, - sizeof(netio_input_config_t), - NETIO_IPP_INPUT_REGISTER_OFF); - PDEBUG("hv_dev_pwrite(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n", - ret); - if (ret < 0) { - if (ret != NETIO_LINK_DOWN) { - printk(KERN_DEBUG "hv_dev_pwrite " - "NETIO_IPP_INPUT_REGISTER_OFF failure %d\n", - ret); - } - info->link_down = (ret == NETIO_LINK_DOWN); - return; - } - - /* - * Get the pointer to our queue's system part. - */ - - ret = hv_dev_pread(priv->hv_devhdl, 0, - (HV_VirtAddr)&queuep, - sizeof(netio_queue_impl_t *), - NETIO_IPP_INPUT_REGISTER_OFF); - PDEBUG("hv_dev_pread(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n", - ret); - PDEBUG("queuep %p\n", queuep); - if (ret <= 0) { - /* ISSUE: Shouldn't this be a fatal error? */ - pr_err("hv_dev_pread NETIO_IPP_INPUT_REGISTER_OFF failure\n"); - return; - } - - queue = &info->queue; - - queue->__system_part = queuep; - - memset(&queue->__user_part, 0, sizeof(netio_queue_user_impl_t)); - - /* This is traditionally "config.num_receive_packets / 2". */ - queue->__user_part.__receive_credit_interval = 4; - queue->__user_part.__receive_credit_remaining = - queue->__user_part.__receive_credit_interval; - - /* - * Get a fastio index from the hypervisor. - * ISSUE: Shouldn't this check the result? - */ - ret = hv_dev_pread(priv->hv_devhdl, 0, - (HV_VirtAddr)&queue->__user_part.__fastio_index, - sizeof(queue->__user_part.__fastio_index), - NETIO_IPP_GET_FASTIO_OFF); - PDEBUG("hv_dev_pread(NETIO_IPP_GET_FASTIO_OFF) returned %d\n", ret); - - /* Now we are registered. */ - info->registered = true; -} - - -/* - * Deregister with hypervisor on the current CPU. - * - * This simply discards all our credits, so no more packets will be - * delivered to this tile. There may still be packets in our queue. - * - * Also, disable the ingress interrupt. - */ -static void tile_net_deregister(void *dev_ptr) -{ - struct net_device *dev = (struct net_device *)dev_ptr; - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info = priv->cpu[my_cpu]; - - /* Disable the ingress interrupt. */ - disable_percpu_irq(priv->intr_id); - - /* Do nothing else if not registered. */ - if (info == NULL || !info->registered) - return; - - { - struct tile_netio_queue *queue = &info->queue; - netio_queue_user_impl_t *qup = &queue->__user_part; - - /* Discard all our credits. */ - __netio_fastio_return_credits(qup->__fastio_index, -1); - } -} - - -/* - * Unregister with hypervisor on the current CPU. - * - * Also, disable the ingress interrupt. - */ -static void tile_net_unregister(void *dev_ptr) -{ - struct net_device *dev = (struct net_device *)dev_ptr; - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info = priv->cpu[my_cpu]; - - int ret; - int dummy = 0; - - /* Disable the ingress interrupt. */ - disable_percpu_irq(priv->intr_id); - - /* Do nothing else if not registered. */ - if (info == NULL || !info->registered) - return; - - /* Unregister ourselves with LIPP/LEPP. */ - ret = hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy, - sizeof(dummy), NETIO_IPP_INPUT_UNREGISTER_OFF); - if (ret < 0) - panic("Failed to unregister with LIPP/LEPP!\n"); - - /* Discard all packets still in our NetIO queue. */ - tile_net_discard_packets(dev); - - /* Reset state. */ - info->num_needed_small_buffers = 0; - info->num_needed_large_buffers = 0; - - /* Cancel egress timer. */ - del_timer(&info->egress_timer); - info->egress_timer_scheduled = false; -} - - -/* - * Helper function for "tile_net_stop()". - * - * Also used to handle registration failure in "tile_net_open_inner()", - * when the various extra steps in "tile_net_stop()" are not necessary. - */ -static void tile_net_stop_aux(struct net_device *dev) -{ - struct tile_net_priv *priv = netdev_priv(dev); - int i; - - int dummy = 0; - - /* - * Unregister all tiles, so LIPP will stop delivering packets. - * Also, delete all the "napi" objects (sequentially, to protect - * "dev->napi_list"). - */ - on_each_cpu(tile_net_unregister, (void *)dev, 1); - for_each_online_cpu(i) { - struct tile_net_cpu *info = priv->cpu[i]; - if (info != NULL && info->registered) { - netif_napi_del(&info->napi); - info->registered = false; - } - } - - /* Stop LIPP/LEPP. */ - if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy, - sizeof(dummy), NETIO_IPP_STOP_SHIM_OFF) < 0) - panic("Failed to stop LIPP/LEPP!\n"); - - priv->partly_opened = false; -} - - -/* - * Disable NAPI for the given device on the current cpu. - */ -static void tile_net_stop_disable(void *dev_ptr) -{ - struct net_device *dev = (struct net_device *)dev_ptr; - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info = priv->cpu[my_cpu]; - - /* Disable NAPI if needed. */ - if (info != NULL && info->napi_enabled) { - napi_disable(&info->napi); - info->napi_enabled = false; - } -} - - -/* - * Enable NAPI and the ingress interrupt for the given device - * on the current cpu. - * - * ISSUE: Only do this for "network cpus"? - */ -static void tile_net_open_enable(void *dev_ptr) -{ - struct net_device *dev = (struct net_device *)dev_ptr; - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info = priv->cpu[my_cpu]; - - /* Enable NAPI. */ - napi_enable(&info->napi); - info->napi_enabled = true; - - /* Enable the ingress interrupt. */ - enable_percpu_irq(priv->intr_id, 0); -} - - -/* - * tile_net_open_inner does most of the work of bringing up the interface. - * It's called from tile_net_open(), and also from tile_net_retry_open(). - * The return value is 0 if the interface was brought up, < 0 if - * tile_net_open() should return the return value as an error, and > 0 if - * tile_net_open() should return success and schedule a work item to - * periodically retry the bringup. - */ -static int tile_net_open_inner(struct net_device *dev) -{ - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info; - struct tile_netio_queue *queue; - int result = 0; - int i; - int dummy = 0; - - /* - * First try to register just on the local CPU, and handle any - * semi-expected "link down" failure specially. Note that we - * do NOT call "tile_net_stop_aux()", unlike below. - */ - tile_net_register(dev); - info = priv->cpu[my_cpu]; - if (!info->registered) { - if (info->link_down) - return 1; - return -EAGAIN; - } - - /* - * Now register everywhere else. If any registration fails, - * even for "link down" (which might not be possible), we - * clean up using "tile_net_stop_aux()". Also, add all the - * "napi" objects (sequentially, to protect "dev->napi_list"). - * ISSUE: Only use "netif_napi_add()" for "network cpus"? - */ - smp_call_function(tile_net_register, (void *)dev, 1); - for_each_online_cpu(i) { - struct tile_net_cpu *info = priv->cpu[i]; - if (info->registered) - netif_napi_add(dev, &info->napi, tile_net_poll, 64); - else - result = -EAGAIN; - } - if (result != 0) { - tile_net_stop_aux(dev); - return result; - } - - queue = &info->queue; - - if (priv->intr_id == 0) { - unsigned int irq; - - /* - * Acquire the irq allocated by the hypervisor. Every - * queue gets the same irq. The "__intr_id" field is - * "1 << irq", so we use "__ffs()" to extract "irq". - */ - priv->intr_id = queue->__system_part->__intr_id; - BUG_ON(priv->intr_id == 0); - irq = __ffs(priv->intr_id); - - /* - * Register the ingress interrupt handler for this - * device, permanently. - * - * We used to call "free_irq()" in "tile_net_stop()", - * and then re-register the handler here every time, - * but that caused DNP errors in "handle_IRQ_event()" - * because "desc->action" was NULL. See bug 9143. - */ - tile_irq_activate(irq, TILE_IRQ_PERCPU); - BUG_ON(request_irq(irq, tile_net_handle_ingress_interrupt, - 0, dev->name, (void *)dev) != 0); - } - - { - /* Allocate initial buffers. */ - - int max_buffers = - priv->network_cpus_count * priv->network_cpus_credits; - - info->num_needed_small_buffers = - min(LIPP_SMALL_BUFFERS, max_buffers); - - info->num_needed_large_buffers = - min(LIPP_LARGE_BUFFERS, max_buffers); - - tile_net_provide_needed_buffers(info); - - if (info->num_needed_small_buffers != 0 || - info->num_needed_large_buffers != 0) - panic("Insufficient memory for buffer stack!"); - } - - /* We are about to be active. */ - priv->active = true; - - /* Make sure "active" is visible to all tiles. */ - mb(); - - /* On each tile, enable NAPI and the ingress interrupt. */ - on_each_cpu(tile_net_open_enable, (void *)dev, 1); - - /* Start LIPP/LEPP and activate "ingress" at the shim. */ - if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy, - sizeof(dummy), NETIO_IPP_INPUT_INIT_OFF) < 0) - panic("Failed to activate the LIPP Shim!\n"); - - /* Start our transmit queue. */ - netif_start_queue(dev); - - return 0; -} - - -/* - * Called periodically to retry bringing up the NetIO interface, - * if it doesn't come up cleanly during tile_net_open(). - */ -static void tile_net_open_retry(struct work_struct *w) -{ - struct delayed_work *dw = to_delayed_work(w); - - struct tile_net_priv *priv = - container_of(dw, struct tile_net_priv, retry_work); - - /* - * Try to bring the NetIO interface up. If it fails, reschedule - * ourselves to try again later; otherwise, tell Linux we now have - * a working link. ISSUE: What if the return value is negative? - */ - if (tile_net_open_inner(priv->dev) != 0) - schedule_delayed_work(&priv->retry_work, - TILE_NET_RETRY_INTERVAL); - else - netif_carrier_on(priv->dev); -} - - -/* - * Called when a network interface is made active. - * - * Returns 0 on success, negative value on failure. - * - * The open entry point is called when a network interface is made - * active by the system (IFF_UP). At this point all resources needed - * for transmit and receive operations are allocated, the interrupt - * handler is registered with the OS (if needed), the watchdog timer - * is started, and the stack is notified that the interface is ready. - * - * If the actual link is not available yet, then we tell Linux that - * we have no carrier, and we keep checking until the link comes up. - */ -static int tile_net_open(struct net_device *dev) -{ - int ret = 0; - struct tile_net_priv *priv = netdev_priv(dev); - - /* - * We rely on priv->partly_opened to tell us if this is the - * first time this interface is being brought up. If it is - * set, the IPP was already initialized and should not be - * initialized again. - */ - if (!priv->partly_opened) { - - int count; - int credits; - - /* Initialize LIPP/LEPP, and start the Shim. */ - ret = tile_net_open_aux(dev); - if (ret < 0) { - pr_err("tile_net_open_aux failed: %d\n", ret); - return ret; - } - - /* Analyze the network cpus. */ - - if (network_cpus_used) - cpumask_copy(&priv->network_cpus_map, - &network_cpus_map); - else - cpumask_copy(&priv->network_cpus_map, cpu_online_mask); - - - count = cpumask_weight(&priv->network_cpus_map); - - /* Limit credits to available buffers, and apply min. */ - credits = max(16, (LIPP_LARGE_BUFFERS / count) & ~1); - - /* Apply "GBE" max limit. */ - /* ISSUE: Use higher limit for XGBE? */ - credits = min(NETIO_MAX_RECEIVE_PKTS, credits); - - priv->network_cpus_count = count; - priv->network_cpus_credits = credits; - -#ifdef TILE_NET_DEBUG - pr_info("Using %d network cpus, with %d credits each\n", - priv->network_cpus_count, priv->network_cpus_credits); -#endif - - priv->partly_opened = true; - - } else { - /* FIXME: Is this possible? */ - /* printk("Already partly opened.\n"); */ - } - - /* - * Attempt to bring up the link. - */ - ret = tile_net_open_inner(dev); - if (ret <= 0) { - if (ret == 0) - netif_carrier_on(dev); - return ret; - } - - /* - * We were unable to bring up the NetIO interface, but we want to - * try again in a little bit. Tell Linux that we have no carrier - * so it doesn't try to use the interface before the link comes up - * and then remember to try again later. - */ - netif_carrier_off(dev); - schedule_delayed_work(&priv->retry_work, TILE_NET_RETRY_INTERVAL); - - return 0; -} - - -static int tile_net_drain_lipp_buffers(struct tile_net_priv *priv) -{ - int n = 0; - - /* Drain all the LIPP buffers. */ - while (true) { - unsigned int buffer; - - /* NOTE: This should never fail. */ - if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&buffer, - sizeof(buffer), NETIO_IPP_DRAIN_OFF) < 0) - break; - - /* Stop when done. */ - if (buffer == 0) - break; - - { - /* Convert "linux_buffer_t" to "va". */ - void *va = __va((phys_addr_t)(buffer >> 1) << 7); - - /* Acquire the associated "skb". */ - struct sk_buff **skb_ptr = va - sizeof(*skb_ptr); - struct sk_buff *skb = *skb_ptr; - - kfree_skb(skb); - } - - n++; - } - - return n; -} - - -/* - * Disables a network interface. - * - * Returns 0, this is not allowed to fail. - * - * The close entry point is called when an interface is de-activated - * by the OS. The hardware is still under the drivers control, but - * needs to be disabled. A global MAC reset is issued to stop the - * hardware, and all transmit and receive resources are freed. - * - * ISSUE: How closely does "netif_running(dev)" mirror "priv->active"? - * - * Before we are called by "__dev_close()", "netif_running()" will - * have been cleared, so no NEW calls to "tile_net_poll()" will be - * made by "netpoll_poll_dev()". - * - * Often, this can cause some tiles to still have packets in their - * queues, so we must call "tile_net_discard_packets()" later. - * - * Note that some other tile may still be INSIDE "tile_net_poll()", - * and in fact, many will be, if there is heavy network load. - * - * Calling "on_each_cpu(tile_net_stop_disable, (void *)dev, 1)" when - * any tile is still "napi_schedule()"'d will induce a horrible crash - * when "msleep()" is called. This includes tiles which are inside - * "tile_net_poll()" which have not yet called "napi_complete()". - * - * So, we must first try to wait long enough for other tiles to finish - * with any current "tile_net_poll()" call, and, hopefully, to clear - * the "scheduled" flag. ISSUE: It is unclear what happens to tiles - * which have called "napi_schedule()" but which had not yet tried to - * call "tile_net_poll()", or which exhausted their budget inside - * "tile_net_poll()" just before this function was called. - */ -static int tile_net_stop(struct net_device *dev) -{ - struct tile_net_priv *priv = netdev_priv(dev); - - PDEBUG("tile_net_stop()\n"); - - /* Start discarding packets. */ - priv->active = false; - - /* Make sure "active" is visible to all tiles. */ - mb(); - - /* - * On each tile, make sure no NEW packets get delivered, and - * disable the ingress interrupt. - * - * Note that the ingress interrupt can fire AFTER this, - * presumably due to packets which were recently delivered, - * but it will have no effect. - */ - on_each_cpu(tile_net_deregister, (void *)dev, 1); - - /* Optimistically drain LIPP buffers. */ - (void)tile_net_drain_lipp_buffers(priv); - - /* ISSUE: Only needed if not yet fully open. */ - cancel_delayed_work_sync(&priv->retry_work); - - /* Can't transmit any more. */ - netif_stop_queue(dev); - - /* Disable NAPI on each tile. */ - on_each_cpu(tile_net_stop_disable, (void *)dev, 1); - - /* - * Drain any remaining LIPP buffers. NOTE: This "printk()" - * has never been observed, but in theory it could happen. - */ - if (tile_net_drain_lipp_buffers(priv) != 0) - printk("Had to drain some extra LIPP buffers!\n"); - - /* Stop LIPP/LEPP. */ - tile_net_stop_aux(dev); - - /* - * ISSUE: It appears that, in practice anyway, by the time we - * get here, there are no pending completions, but just in case, - * we free (all of) them anyway. - */ - while (tile_net_lepp_free_comps(dev, true)) - /* loop */; - - /* Wipe the EPP queue, and wait till the stores hit the EPP. */ - memset(priv->eq, 0, sizeof(lepp_queue_t)); - mb(); - - return 0; -} - - -/* - * Prepare the "frags" info for the resulting LEPP command. - * - * If needed, flush the memory used by the frags. - */ -static unsigned int tile_net_tx_frags(lepp_frag_t *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); - - phys_addr_t cpa; - - if (b_len != 0) { - - if (!hash_default) - finv_buffer_remote(b_data, b_len, 0); - - cpa = __pa(b_data); - frags[n].cpa_lo = cpa; - frags[n].cpa_hi = cpa >> 32; - frags[n].length = b_len; - frags[n].hash_for_home = hash_default; - n++; - } - - for (i = 0; i < sh->nr_frags; i++) { - - skb_frag_t *f = &sh->frags[i]; - unsigned long pfn = page_to_pfn(skb_frag_page(f)); - - /* FIXME: Compute "hash_for_home" properly. */ - /* ISSUE: The hypervisor checks CHIP_HAS_REV1_DMA_PACKETS(). */ - int hash_for_home = hash_default; - - /* FIXME: Hmmm. */ - if (!hash_default) { - void *va = pfn_to_kaddr(pfn) + f->page_offset; - BUG_ON(PageHighMem(skb_frag_page(f))); - finv_buffer_remote(va, skb_frag_size(f), 0); - } - - cpa = ((phys_addr_t)pfn << PAGE_SHIFT) + f->page_offset; - frags[n].cpa_lo = cpa; - frags[n].cpa_hi = cpa >> 32; - frags[n].length = skb_frag_size(f); - frags[n].hash_for_home = hash_for_home; - n++; - } - - return n; -} - - -/* - * This function takes "skb", consisting of a header template and a - * payload, and hands it to LEPP, to emit as one or more segments, - * each consisting of a possibly modified header, plus a piece of the - * payload, via a process known as "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, which must be handled carefully in LEPP. - * - * See "emulate_large_send_offload()" for some reference code, which - * does not handle checksumming. - * - * ISSUE: How do we make sure that high memory DMA does not migrate? - */ -static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev) -{ - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info = priv->cpu[my_cpu]; - struct tile_net_stats_t *stats = &info->stats; - - struct skb_shared_info *sh = skb_shinfo(skb); - - 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 == ih", 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. */ - /* NOTE: This may be less than skb_headlen(skb). */ - unsigned int sh_len = eh_len + ih_len + th_len; - - /* The number of payload bytes at "skb->data + sh_len". */ - /* This is non-zero for sendfile() without HIGHDMA. */ - unsigned int b_len = skb_headlen(skb) - sh_len; - - /* The total number of payload bytes. */ - unsigned int d_len = b_len + skb->data_len; - - /* The maximum payload size. */ - unsigned int p_len = sh->gso_size; - - /* The total number of segments. */ - unsigned int num_segs = sh->gso_segs; - - /* The temporary copy of the command. */ - u32 cmd_body[(LEPP_MAX_CMD_SIZE + 3) / 4]; - lepp_tso_cmd_t *cmd = (lepp_tso_cmd_t *)cmd_body; - - /* Analyze the "frags". */ - unsigned int num_frags = - tile_net_tx_frags(cmd->frags, skb, data + sh_len, b_len); - - /* The size of the command, including frags and header. */ - size_t cmd_size = LEPP_TSO_CMD_SIZE(num_frags, sh_len); - - /* The command header. */ - lepp_tso_cmd_t cmd_init = { - .tso = true, - .header_size = sh_len, - .ip_offset = eh_len, - .tcp_offset = eh_len + ih_len, - .payload_size = p_len, - .num_frags = num_frags, - }; - - unsigned long irqflags; - - lepp_queue_t *eq = priv->eq; - - struct sk_buff *olds[8]; - unsigned int wanted = 8; - unsigned int i, nolds = 0; - - unsigned int cmd_head, cmd_tail, cmd_next; - unsigned int comp_tail; - - - /* Paranoia. */ - BUG_ON(skb->protocol != htons(ETH_P_IP)); - BUG_ON(ih->protocol != IPPROTO_TCP); - BUG_ON(skb->ip_summed != CHECKSUM_PARTIAL); - BUG_ON(num_frags > LEPP_MAX_FRAGS); - /*--BUG_ON(num_segs != (d_len + (p_len - 1)) / p_len); */ - BUG_ON(num_segs <= 1); - - - /* Finish preparing the command. */ - - /* Copy the command header. */ - *cmd = cmd_init; - - /* Copy the "header". */ - memcpy(&cmd->frags[num_frags], data, sh_len); - - - /* Prefetch and wait, to minimize time spent holding the spinlock. */ - prefetch_L1(&eq->comp_tail); - prefetch_L1(&eq->cmd_tail); - mb(); - - - /* Enqueue the command. */ - - spin_lock_irqsave(&priv->eq_lock, irqflags); - - /* Handle completions if needed to make room. */ - /* NOTE: Return NETDEV_TX_BUSY if there is still no room. */ - if (lepp_num_free_comp_slots(eq) == 0) { - nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0); - if (nolds == 0) { -busy: - spin_unlock_irqrestore(&priv->eq_lock, irqflags); - return NETDEV_TX_BUSY; - } - } - - cmd_head = eq->cmd_head; - cmd_tail = eq->cmd_tail; - - /* Prepare to advance, detecting full queue. */ - /* NOTE: Return NETDEV_TX_BUSY if the queue is full. */ - cmd_next = cmd_tail + cmd_size; - if (cmd_tail < cmd_head && cmd_next >= cmd_head) - goto busy; - if (cmd_next > LEPP_CMD_LIMIT) { - cmd_next = 0; - if (cmd_next == cmd_head) - goto busy; - } - - /* Copy the command. */ - memcpy(&eq->cmds[cmd_tail], cmd, cmd_size); - - /* Advance. */ - cmd_tail = cmd_next; - - /* Record "skb" for eventual freeing. */ - comp_tail = eq->comp_tail; - eq->comps[comp_tail] = skb; - LEPP_QINC(comp_tail); - eq->comp_tail = comp_tail; - - /* Flush before allowing LEPP to handle the command. */ - /* ISSUE: Is this the optimal location for the flush? */ - __insn_mf(); - - eq->cmd_tail = cmd_tail; - - /* NOTE: Using "4" here is more efficient than "0" or "2", */ - /* and, strangely, more efficient than pre-checking the number */ - /* of available completions, and comparing it to 4. */ - if (nolds == 0) - nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4); - - spin_unlock_irqrestore(&priv->eq_lock, irqflags); - - /* Handle completions. */ - for (i = 0; i < nolds; i++) - dev_consume_skb_any(olds[i]); - - /* Update stats. */ - u64_stats_update_begin(&stats->syncp); - stats->tx_packets += num_segs; - stats->tx_bytes += (num_segs * sh_len) + d_len; - u64_stats_update_end(&stats->syncp); - - /* Make sure the egress timer is scheduled. */ - tile_net_schedule_egress_timer(info); - - return NETDEV_TX_OK; -} - - -/* - * Transmit a packet (called by the kernel via "hard_start_xmit" hook). - */ -static int tile_net_tx(struct sk_buff *skb, struct net_device *dev) -{ - struct tile_net_priv *priv = netdev_priv(dev); - int my_cpu = smp_processor_id(); - struct tile_net_cpu *info = priv->cpu[my_cpu]; - struct tile_net_stats_t *stats = &info->stats; - - unsigned long irqflags; - - struct skb_shared_info *sh = skb_shinfo(skb); - - unsigned int len = skb->len; - unsigned char *data = skb->data; - - unsigned int csum_start = skb_checksum_start_offset(skb); - - lepp_frag_t frags[1 + MAX_SKB_FRAGS]; - - unsigned int num_frags; - - lepp_queue_t *eq = priv->eq; - - struct sk_buff *olds[8]; - unsigned int wanted = 8; - unsigned int i, nolds = 0; - - unsigned int cmd_size = sizeof(lepp_cmd_t); - - unsigned int cmd_head, cmd_tail, cmd_next; - unsigned int comp_tail; - - lepp_cmd_t cmds[1 + MAX_SKB_FRAGS]; - - - /* - * This is paranoia, since we think that if the link doesn't come - * up, telling Linux we have no carrier will keep it from trying - * to transmit. If it does, though, we can't execute this routine, - * since data structures we depend on aren't set up yet. - */ - if (!info->registered) - return NETDEV_TX_BUSY; - - - /* Save the timestamp. */ - netif_trans_update(dev); - - -#ifdef TILE_NET_PARANOIA -#if CHIP_HAS_CBOX_HOME_MAP() - if (hash_default) { - HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)data); - if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3) - panic("Non-HFH egress buffer! VA=%p Mode=%d PTE=%llx", - data, hv_pte_get_mode(pte), hv_pte_val(pte)); - } -#endif -#endif - - -#ifdef TILE_NET_DUMP_PACKETS - /* ISSUE: Does not dump the "frags". */ - dump_packet(data, skb_headlen(skb), "tx"); -#endif /* TILE_NET_DUMP_PACKETS */ - - - if (sh->gso_size != 0) - return tile_net_tx_tso(skb, dev); - - - /* Prepare the commands. */ - - num_frags = tile_net_tx_frags(frags, skb, data, skb_headlen(skb)); - - for (i = 0; i < num_frags; i++) { - - bool final = (i == num_frags - 1); - - lepp_cmd_t cmd = { - .cpa_lo = frags[i].cpa_lo, - .cpa_hi = frags[i].cpa_hi, - .length = frags[i].length, - .hash_for_home = frags[i].hash_for_home, - .send_completion = final, - .end_of_packet = final - }; - - if (i == 0 && skb->ip_summed == CHECKSUM_PARTIAL) { - cmd.compute_checksum = 1; - cmd.checksum_data.bits.start_byte = csum_start; - cmd.checksum_data.bits.count = len - csum_start; - cmd.checksum_data.bits.destination_byte = - csum_start + skb->csum_offset; - } - - cmds[i] = cmd; - } - - - /* Prefetch and wait, to minimize time spent holding the spinlock. */ - prefetch_L1(&eq->comp_tail); - prefetch_L1(&eq->cmd_tail); - mb(); - - - /* Enqueue the commands. */ - - spin_lock_irqsave(&priv->eq_lock, irqflags); - - /* Handle completions if needed to make room. */ - /* NOTE: Return NETDEV_TX_BUSY if there is still no room. */ - if (lepp_num_free_comp_slots(eq) == 0) { - nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0); - if (nolds == 0) { -busy: - spin_unlock_irqrestore(&priv->eq_lock, irqflags); - return NETDEV_TX_BUSY; - } - } - - cmd_head = eq->cmd_head; - cmd_tail = eq->cmd_tail; - - /* Copy the commands, or fail. */ - /* NOTE: Return NETDEV_TX_BUSY if the queue is full. */ - for (i = 0; i < num_frags; i++) { - - /* Prepare to advance, detecting full queue. */ - cmd_next = cmd_tail + cmd_size; - if (cmd_tail < cmd_head && cmd_next >= cmd_head) - goto busy; - if (cmd_next > LEPP_CMD_LIMIT) { - cmd_next = 0; - if (cmd_next == cmd_head) - goto busy; - } - - /* Copy the command. */ - *(lepp_cmd_t *)&eq->cmds[cmd_tail] = cmds[i]; - - /* Advance. */ - cmd_tail = cmd_next; - } - - /* Record "skb" for eventual freeing. */ - comp_tail = eq->comp_tail; - eq->comps[comp_tail] = skb; - LEPP_QINC(comp_tail); - eq->comp_tail = comp_tail; - - /* Flush before allowing LEPP to handle the command. */ - /* ISSUE: Is this the optimal location for the flush? */ - __insn_mf(); - - eq->cmd_tail = cmd_tail; - - /* NOTE: Using "4" here is more efficient than "0" or "2", */ - /* and, strangely, more efficient than pre-checking the number */ - /* of available completions, and comparing it to 4. */ - if (nolds == 0) - nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4); - - spin_unlock_irqrestore(&priv->eq_lock, irqflags); - - /* Handle completions. */ - for (i = 0; i < nolds; i++) - dev_consume_skb_any(olds[i]); - - /* HACK: Track "expanded" size for short packets (e.g. 42 < 60). */ - u64_stats_update_begin(&stats->syncp); - stats->tx_packets++; - stats->tx_bytes += ((len >= ETH_ZLEN) ? len : ETH_ZLEN); - u64_stats_update_end(&stats->syncp); - - /* 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) -{ - PDEBUG("tile_net_tx_timeout()\n"); - PDEBUG("Transmit timeout at %ld, latency %ld\n", jiffies, - jiffies - dev_trans_start(dev)); - - /* XXX: 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. - * - * Returns the address of the device statistics structure. - */ -static void tile_net_get_stats64(struct net_device *dev, - struct rtnl_link_stats64 *stats) -{ - struct tile_net_priv *priv = netdev_priv(dev); - u64 rx_packets = 0, tx_packets = 0; - u64 rx_bytes = 0, tx_bytes = 0; - u64 rx_errors = 0, rx_dropped = 0; - int i; - - for_each_online_cpu(i) { - struct tile_net_stats_t *cpu_stats; - u64 trx_packets, ttx_packets, trx_bytes, ttx_bytes; - u64 trx_errors, trx_dropped; - unsigned int start; - - if (priv->cpu[i] == NULL) - continue; - cpu_stats = &priv->cpu[i]->stats; - - do { - start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); - trx_packets = cpu_stats->rx_packets; - ttx_packets = cpu_stats->tx_packets; - trx_bytes = cpu_stats->rx_bytes; - ttx_bytes = cpu_stats->tx_bytes; - trx_errors = cpu_stats->rx_errors; - trx_dropped = cpu_stats->rx_dropped; - } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); - - rx_packets += trx_packets; - tx_packets += ttx_packets; - rx_bytes += trx_bytes; - tx_bytes += ttx_bytes; - rx_errors += trx_errors; - rx_dropped += trx_dropped; - } - - stats->rx_packets = rx_packets; - stats->tx_packets = tx_packets; - stats->rx_bytes = rx_bytes; - stats->tx_bytes = tx_bytes; - stats->rx_errors = rx_errors; - stats->rx_dropped = rx_dropped; -} - -/* - * Change the Ethernet Address of the NIC. - * - * The hypervisor driver does not support changing MAC address. However, - * the IPP 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 the NetIO program or kernel driver which is actually - * handling them. - * - * 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 -EADDRNOTAVAIL; - - /* ISSUE: Note that "dev_addr" is now a pointer. */ - memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); - - return 0; -} - - -/* - * Obtain the MAC address from the hypervisor. - * This must be done before opening the device. - */ -static int tile_net_get_mac(struct net_device *dev) -{ - struct tile_net_priv *priv = netdev_priv(dev); - - char hv_dev_name[32]; - int len; - - __netio_getset_offset_t offset = { .word = NETIO_IPP_PARAM_OFF }; - - int ret; - - /* For example, "xgbe0". */ - strcpy(hv_dev_name, dev->name); - len = strlen(hv_dev_name); - - /* For example, "xgbe/0". */ - hv_dev_name[len] = hv_dev_name[len - 1]; - hv_dev_name[len - 1] = '/'; - len++; - - /* For example, "xgbe/0/native_hash". */ - strcpy(hv_dev_name + len, hash_default ? "/native_hash" : "/native"); - - /* Get the hypervisor handle for this device. */ - priv->hv_devhdl = hv_dev_open((HV_VirtAddr)hv_dev_name, 0); - PDEBUG("hv_dev_open(%s) returned %d %p\n", - hv_dev_name, priv->hv_devhdl, &priv->hv_devhdl); - if (priv->hv_devhdl < 0) { - if (priv->hv_devhdl == HV_ENODEV) - printk(KERN_DEBUG "Ignoring unconfigured device %s\n", - hv_dev_name); - else - printk(KERN_DEBUG "hv_dev_open(%s) returned %d\n", - hv_dev_name, priv->hv_devhdl); - return -1; - } - - /* - * Read the hardware address from the hypervisor. - * ISSUE: Note that "dev_addr" is now a pointer. - */ - offset.bits.class = NETIO_PARAM; - offset.bits.addr = NETIO_PARAM_MAC; - ret = hv_dev_pread(priv->hv_devhdl, 0, - (HV_VirtAddr)dev->dev_addr, dev->addr_len, - offset.word); - PDEBUG("hv_dev_pread(NETIO_PARAM_MAC) returned %d\n", ret); - if (ret <= 0) { - printk(KERN_DEBUG "hv_dev_pread(NETIO_PARAM_MAC) %s failed\n", - dev->name); - /* - * Since the device is configured by the hypervisor but we - * can't get its MAC address, we are most likely running - * the simulator, so let's generate a random MAC address. - */ - eth_hw_addr_random(dev); - } - - 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) -{ - struct tile_net_priv *priv = netdev_priv(dev); - disable_percpu_irq(priv->intr_id); - tile_net_handle_ingress_interrupt(priv->intr_id, dev); - enable_percpu_irq(priv->intr_id, 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_stats64 = tile_net_get_stats64, - .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) -{ - netdev_features_t features = 0; - - ether_setup(dev); - dev->netdev_ops = &tile_net_ops; - dev->watchdog_timeo = TILE_NET_TIMEOUT; - dev->tx_queue_len = TILE_NET_TX_QUEUE_LEN; - - /* MTU range: 68 - 1500 */ - dev->mtu = TILE_NET_MTU; - dev->min_mtu = ETH_MIN_MTU; - dev->max_mtu = TILE_NET_MTU; - - features |= NETIF_F_HW_CSUM; - features |= NETIF_F_SG; - - /* We support TSO iff the HV supports sufficient frags. */ - if (LEPP_MAX_FRAGS >= 1 + MAX_SKB_FRAGS) - features |= NETIF_F_TSO; - - /* We can't support HIGHDMA without hash_default, since we need - * to be able to finv() with a VA if we don't have hash_default. - */ - if (hash_default) - features |= NETIF_F_HIGHDMA; - - dev->hw_features |= features; - dev->vlan_features |= features; - dev->features |= features; -} - - -/* - * Allocate the device structure, register the device, and obtain the - * MAC address from the hypervisor. - */ -static struct net_device *tile_net_dev_init(const char *name) -{ - int ret; - struct net_device *dev; - struct tile_net_priv *priv; - - /* - * 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, NET_NAME_UNKNOWN, - tile_net_setup); - if (!dev) { - pr_err("alloc_netdev(%s) failed\n", name); - return NULL; - } - - priv = netdev_priv(dev); - - /* Initialize "priv". */ - - memset(priv, 0, sizeof(*priv)); - - /* Save "dev" for "tile_net_open_retry()". */ - priv->dev = dev; - - INIT_DELAYED_WORK(&priv->retry_work, tile_net_open_retry); - - spin_lock_init(&priv->eq_lock); - - /* Allocate "eq". */ - priv->eq_pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, EQ_ORDER); - if (!priv->eq_pages) { - free_netdev(dev); - return NULL; - } - priv->eq = page_address(priv->eq_pages); - - /* Register the network device. */ - ret = register_netdev(dev); - if (ret) { - pr_err("register_netdev %s failed %d\n", dev->name, ret); - __free_pages(priv->eq_pages, EQ_ORDER); - free_netdev(dev); - return NULL; - } - - /* Get the MAC address. */ - ret = tile_net_get_mac(dev); - if (ret < 0) { - unregister_netdev(dev); - __free_pages(priv->eq_pages, EQ_ORDER); - free_netdev(dev); - return NULL; - } - - return dev; -} - - -/* - * Module cleanup. - * - * FIXME: If compiled as a module, this module cannot be "unloaded", - * because the "ingress interrupt handler" is registered permanently. - */ -static void tile_net_cleanup(void) -{ - int i; - - for (i = 0; i < TILE_NET_DEVS; i++) { - if (tile_net_devs[i]) { - struct net_device *dev = tile_net_devs[i]; - struct tile_net_priv *priv = netdev_priv(dev); - unregister_netdev(dev); - finv_buffer_remote(priv->eq, EQ_SIZE, 0); - __free_pages(priv->eq_pages, EQ_ORDER); - free_netdev(dev); - } - } -} - - -/* - * Module initialization. - */ -static int tile_net_init_module(void) -{ - pr_info("Tilera Network Driver\n"); - - tile_net_devs[0] = tile_net_dev_init("xgbe0"); - tile_net_devs[1] = tile_net_dev_init("xgbe1"); - tile_net_devs[2] = tile_net_dev_init("gbe0"); - tile_net_devs[3] = tile_net_dev_init("gbe1"); - - return 0; -} - - -module_init(tile_net_init_module); -module_exit(tile_net_cleanup); - - -#ifndef MODULE - -/* - * The "network_cpus" boot argument specifies the cpus that are dedicated - * to handle ingress packets. - * - * The parameter should be in the form "network_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 int __init network_cpus_setup(char *str) -{ - int rc = cpulist_parse_crop(str, &network_cpus_map); - if (rc != 0) { - pr_warn("network_cpus=%s: malformed cpu list\n", str); - } else { - - /* Remove dedicated cpus. */ - cpumask_and(&network_cpus_map, &network_cpus_map, - cpu_possible_mask); - - - if (cpumask_empty(&network_cpus_map)) { - pr_warn("Ignoring network_cpus='%s'\n", str); - } else { - pr_info("Linux network CPUs: %*pbl\n", - cpumask_pr_args(&network_cpus_map)); - network_cpus_used = true; - } - } - - return 0; -} -__setup("network_cpus=", network_cpus_setup); - -#endif |