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597 lines
17 KiB
597 lines
17 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* (C) Copyright 2020 Hewlett Packard Enterprise Development LP |
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* Copyright (C) 1999-2009 Silicon Graphics, Inc. All rights reserved. |
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*/ |
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|
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/* |
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* Cross Partition Network Interface (XPNET) support |
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* |
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* XPNET provides a virtual network layered on top of the Cross |
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* Partition communication layer. |
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* |
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* XPNET provides direct point-to-point and broadcast-like support |
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* for an ethernet-like device. The ethernet broadcast medium is |
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* replaced with a point-to-point message structure which passes |
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* pointers to a DMA-capable block that a remote partition should |
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* retrieve and pass to the upper level networking layer. |
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* |
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*/ |
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|
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include "xp.h" |
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|
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/* |
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* The message payload transferred by XPC. |
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* |
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* buf_pa is the physical address where the DMA should pull from. |
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* |
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* NOTE: for performance reasons, buf_pa should _ALWAYS_ begin on a |
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* cacheline boundary. To accomplish this, we record the number of |
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* bytes from the beginning of the first cacheline to the first useful |
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* byte of the skb (leadin_ignore) and the number of bytes from the |
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* last useful byte of the skb to the end of the last cacheline |
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* (tailout_ignore). |
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* |
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* size is the number of bytes to transfer which includes the skb->len |
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* (useful bytes of the senders skb) plus the leadin and tailout |
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*/ |
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struct xpnet_message { |
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u16 version; /* Version for this message */ |
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u16 embedded_bytes; /* #of bytes embedded in XPC message */ |
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u32 magic; /* Special number indicating this is xpnet */ |
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unsigned long buf_pa; /* phys address of buffer to retrieve */ |
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u32 size; /* #of bytes in buffer */ |
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u8 leadin_ignore; /* #of bytes to ignore at the beginning */ |
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u8 tailout_ignore; /* #of bytes to ignore at the end */ |
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unsigned char data; /* body of small packets */ |
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}; |
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/* |
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* Determine the size of our message, the cacheline aligned size, |
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* and then the number of message will request from XPC. |
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* |
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* XPC expects each message to exist in an individual cacheline. |
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*/ |
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#define XPNET_MSG_SIZE XPC_MSG_PAYLOAD_MAX_SIZE |
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#define XPNET_MSG_DATA_MAX \ |
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(XPNET_MSG_SIZE - offsetof(struct xpnet_message, data)) |
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#define XPNET_MSG_NENTRIES (PAGE_SIZE / XPC_MSG_MAX_SIZE) |
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#define XPNET_MAX_KTHREADS (XPNET_MSG_NENTRIES + 1) |
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#define XPNET_MAX_IDLE_KTHREADS (XPNET_MSG_NENTRIES + 1) |
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/* |
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* Version number of XPNET implementation. XPNET can always talk to versions |
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* with same major #, and never talk to versions with a different version. |
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*/ |
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#define _XPNET_VERSION(_major, _minor) (((_major) << 4) | (_minor)) |
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#define XPNET_VERSION_MAJOR(_v) ((_v) >> 4) |
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#define XPNET_VERSION_MINOR(_v) ((_v) & 0xf) |
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#define XPNET_VERSION _XPNET_VERSION(1, 0) /* version 1.0 */ |
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#define XPNET_VERSION_EMBED _XPNET_VERSION(1, 1) /* version 1.1 */ |
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#define XPNET_MAGIC 0x88786984 /* "XNET" */ |
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#define XPNET_VALID_MSG(_m) \ |
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((XPNET_VERSION_MAJOR(_m->version) == XPNET_VERSION_MAJOR(XPNET_VERSION)) \ |
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&& (msg->magic == XPNET_MAGIC)) |
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#define XPNET_DEVICE_NAME "xp0" |
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/* |
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* When messages are queued with xpc_send_notify, a kmalloc'd buffer |
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* of the following type is passed as a notification cookie. When the |
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* notification function is called, we use the cookie to decide |
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* whether all outstanding message sends have completed. The skb can |
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* then be released. |
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*/ |
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struct xpnet_pending_msg { |
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struct sk_buff *skb; |
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atomic_t use_count; |
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}; |
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static struct net_device *xpnet_device; |
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|
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/* |
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* When we are notified of other partitions activating, we add them to |
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* our bitmask of partitions to which we broadcast. |
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*/ |
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static unsigned long *xpnet_broadcast_partitions; |
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/* protect above */ |
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static DEFINE_SPINLOCK(xpnet_broadcast_lock); |
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/* |
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* Since the Block Transfer Engine (BTE) is being used for the transfer |
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* and it relies upon cache-line size transfers, we need to reserve at |
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* least one cache-line for head and tail alignment. The BTE is |
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* limited to 8MB transfers. |
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* |
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* Testing has shown that changing MTU to greater than 64KB has no effect |
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* on TCP as the two sides negotiate a Max Segment Size that is limited |
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* to 64K. Other protocols May use packets greater than this, but for |
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* now, the default is 64KB. |
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*/ |
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#define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES) |
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/* 68 comes from min TCP+IP+MAC header */ |
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#define XPNET_MIN_MTU 68 |
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/* 32KB has been determined to be the ideal */ |
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#define XPNET_DEF_MTU (0x8000UL) |
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/* |
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* The partid is encapsulated in the MAC address beginning in the following |
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* octet and it consists of two octets. |
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*/ |
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#define XPNET_PARTID_OCTET 2 |
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|
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/* Define the XPNET debug device structures to be used with dev_dbg() et al */ |
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static struct device_driver xpnet_dbg_name = { |
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.name = "xpnet" |
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}; |
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static struct device xpnet_dbg_subname = { |
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.init_name = "", /* set to "" */ |
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.driver = &xpnet_dbg_name |
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}; |
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static struct device *xpnet = &xpnet_dbg_subname; |
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/* |
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* Packet was recevied by XPC and forwarded to us. |
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*/ |
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static void |
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xpnet_receive(short partid, int channel, struct xpnet_message *msg) |
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{ |
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struct sk_buff *skb; |
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void *dst; |
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enum xp_retval ret; |
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if (!XPNET_VALID_MSG(msg)) { |
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/* |
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* Packet with a different XPC version. Ignore. |
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*/ |
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xpc_received(partid, channel, (void *)msg); |
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xpnet_device->stats.rx_errors++; |
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return; |
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} |
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dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size, |
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msg->leadin_ignore, msg->tailout_ignore); |
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/* reserve an extra cache line */ |
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skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES); |
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if (!skb) { |
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dev_err(xpnet, "failed on dev_alloc_skb(%d)\n", |
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msg->size + L1_CACHE_BYTES); |
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xpc_received(partid, channel, (void *)msg); |
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xpnet_device->stats.rx_errors++; |
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return; |
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} |
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/* |
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* The allocated skb has some reserved space. |
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* In order to use xp_remote_memcpy(), we need to get the |
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* skb->data pointer moved forward. |
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*/ |
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skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data & |
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(L1_CACHE_BYTES - 1)) + |
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msg->leadin_ignore)); |
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/* |
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* Update the tail pointer to indicate data actually |
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* transferred. |
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*/ |
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skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore)); |
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/* |
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* Move the data over from the other side. |
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*/ |
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if ((XPNET_VERSION_MINOR(msg->version) == 1) && |
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(msg->embedded_bytes != 0)) { |
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dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, " |
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"%lu)\n", skb->data, &msg->data, |
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(size_t)msg->embedded_bytes); |
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skb_copy_to_linear_data(skb, &msg->data, |
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(size_t)msg->embedded_bytes); |
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} else { |
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dst = (void *)((u64)skb->data & ~(L1_CACHE_BYTES - 1)); |
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dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t" |
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"xp_remote_memcpy(0x%p, 0x%p, %u)\n", dst, |
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(void *)msg->buf_pa, msg->size); |
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ret = xp_remote_memcpy(xp_pa(dst), msg->buf_pa, msg->size); |
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if (ret != xpSuccess) { |
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/* |
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* !!! Need better way of cleaning skb. Currently skb |
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* !!! appears in_use and we can't just call |
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* !!! dev_kfree_skb. |
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*/ |
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dev_err(xpnet, "xp_remote_memcpy(0x%p, 0x%p, 0x%x) " |
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"returned error=0x%x\n", dst, |
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(void *)msg->buf_pa, msg->size, ret); |
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xpc_received(partid, channel, (void *)msg); |
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xpnet_device->stats.rx_errors++; |
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return; |
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} |
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} |
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dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p " |
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"skb->end=0x%p skb->len=%d\n", (void *)skb->head, |
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(void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb), |
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skb->len); |
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skb->protocol = eth_type_trans(skb, xpnet_device); |
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skb->ip_summed = CHECKSUM_UNNECESSARY; |
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dev_dbg(xpnet, "passing skb to network layer\n" |
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"\tskb->head=0x%p skb->data=0x%p skb->tail=0x%p " |
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"skb->end=0x%p skb->len=%d\n", |
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(void *)skb->head, (void *)skb->data, skb_tail_pointer(skb), |
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skb_end_pointer(skb), skb->len); |
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xpnet_device->stats.rx_packets++; |
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xpnet_device->stats.rx_bytes += skb->len + ETH_HLEN; |
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netif_rx_ni(skb); |
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xpc_received(partid, channel, (void *)msg); |
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} |
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/* |
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* This is the handler which XPC calls during any sort of change in |
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* state or message reception on a connection. |
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*/ |
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static void |
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xpnet_connection_activity(enum xp_retval reason, short partid, int channel, |
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void *data, void *key) |
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{ |
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DBUG_ON(partid < 0 || partid >= xp_max_npartitions); |
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DBUG_ON(channel != XPC_NET_CHANNEL); |
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switch (reason) { |
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case xpMsgReceived: /* message received */ |
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DBUG_ON(data == NULL); |
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xpnet_receive(partid, channel, (struct xpnet_message *)data); |
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break; |
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case xpConnected: /* connection completed to a partition */ |
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spin_lock_bh(&xpnet_broadcast_lock); |
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__set_bit(partid, xpnet_broadcast_partitions); |
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spin_unlock_bh(&xpnet_broadcast_lock); |
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netif_carrier_on(xpnet_device); |
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dev_dbg(xpnet, "%s connected to partition %d\n", |
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xpnet_device->name, partid); |
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break; |
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default: |
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spin_lock_bh(&xpnet_broadcast_lock); |
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__clear_bit(partid, xpnet_broadcast_partitions); |
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spin_unlock_bh(&xpnet_broadcast_lock); |
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if (bitmap_empty((unsigned long *)xpnet_broadcast_partitions, |
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xp_max_npartitions)) { |
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netif_carrier_off(xpnet_device); |
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} |
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dev_dbg(xpnet, "%s disconnected from partition %d\n", |
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xpnet_device->name, partid); |
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break; |
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} |
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} |
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static int |
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xpnet_dev_open(struct net_device *dev) |
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{ |
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enum xp_retval ret; |
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dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %ld, " |
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"%ld)\n", XPC_NET_CHANNEL, xpnet_connection_activity, |
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(unsigned long)XPNET_MSG_SIZE, |
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(unsigned long)XPNET_MSG_NENTRIES, |
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(unsigned long)XPNET_MAX_KTHREADS, |
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(unsigned long)XPNET_MAX_IDLE_KTHREADS); |
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ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL, |
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XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, |
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XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS); |
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if (ret != xpSuccess) { |
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dev_err(xpnet, "ifconfig up of %s failed on XPC connect, " |
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"ret=%d\n", dev->name, ret); |
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return -ENOMEM; |
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} |
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dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name); |
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return 0; |
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} |
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static int |
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xpnet_dev_stop(struct net_device *dev) |
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{ |
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xpc_disconnect(XPC_NET_CHANNEL); |
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dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name); |
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return 0; |
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} |
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/* |
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* Notification that the other end has received the message and |
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* DMA'd the skb information. At this point, they are done with |
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* our side. When all recipients are done processing, we |
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* release the skb and then release our pending message structure. |
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*/ |
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static void |
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xpnet_send_completed(enum xp_retval reason, short partid, int channel, |
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void *__qm) |
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{ |
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struct xpnet_pending_msg *queued_msg = (struct xpnet_pending_msg *)__qm; |
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DBUG_ON(queued_msg == NULL); |
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dev_dbg(xpnet, "message to %d notified with reason %d\n", |
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partid, reason); |
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if (atomic_dec_return(&queued_msg->use_count) == 0) { |
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dev_dbg(xpnet, "all acks for skb->head=-x%p\n", |
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(void *)queued_msg->skb->head); |
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dev_kfree_skb_any(queued_msg->skb); |
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kfree(queued_msg); |
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} |
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} |
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static void |
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xpnet_send(struct sk_buff *skb, struct xpnet_pending_msg *queued_msg, |
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u64 start_addr, u64 end_addr, u16 embedded_bytes, int dest_partid) |
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{ |
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u8 msg_buffer[XPNET_MSG_SIZE]; |
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struct xpnet_message *msg = (struct xpnet_message *)&msg_buffer; |
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u16 msg_size = sizeof(struct xpnet_message); |
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enum xp_retval ret; |
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msg->embedded_bytes = embedded_bytes; |
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if (unlikely(embedded_bytes != 0)) { |
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msg->version = XPNET_VERSION_EMBED; |
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dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n", |
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&msg->data, skb->data, (size_t)embedded_bytes); |
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skb_copy_from_linear_data(skb, &msg->data, |
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(size_t)embedded_bytes); |
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msg_size += embedded_bytes - 1; |
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} else { |
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msg->version = XPNET_VERSION; |
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} |
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msg->magic = XPNET_MAGIC; |
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msg->size = end_addr - start_addr; |
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msg->leadin_ignore = (u64)skb->data - start_addr; |
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msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb); |
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msg->buf_pa = xp_pa((void *)start_addr); |
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dev_dbg(xpnet, "sending XPC message to %d:%d\n" |
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"msg->buf_pa=0x%lx, msg->size=%u, " |
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"msg->leadin_ignore=%u, msg->tailout_ignore=%u\n", |
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dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size, |
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msg->leadin_ignore, msg->tailout_ignore); |
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atomic_inc(&queued_msg->use_count); |
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ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, XPC_NOWAIT, msg, |
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msg_size, xpnet_send_completed, queued_msg); |
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if (unlikely(ret != xpSuccess)) |
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atomic_dec(&queued_msg->use_count); |
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} |
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/* |
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* Network layer has formatted a packet (skb) and is ready to place it |
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* "on the wire". Prepare and send an xpnet_message to all partitions |
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* which have connected with us and are targets of this packet. |
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* |
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* MAC-NOTE: For the XPNET driver, the MAC address contains the |
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* destination partid. If the destination partid octets are 0xffff, |
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* this packet is to be broadcast to all connected partitions. |
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*/ |
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static netdev_tx_t |
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xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct xpnet_pending_msg *queued_msg; |
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u64 start_addr, end_addr; |
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short dest_partid; |
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u16 embedded_bytes = 0; |
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dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p " |
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"skb->end=0x%p skb->len=%d\n", (void *)skb->head, |
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(void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb), |
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skb->len); |
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|
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if (skb->data[0] == 0x33) { |
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dev_kfree_skb(skb); |
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return NETDEV_TX_OK; /* nothing needed to be done */ |
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} |
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|
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/* |
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* The xpnet_pending_msg tracks how many outstanding |
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* xpc_send_notifies are relying on this skb. When none |
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* remain, release the skb. |
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*/ |
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queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC); |
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if (queued_msg == NULL) { |
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dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping " |
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"packet\n", sizeof(struct xpnet_pending_msg)); |
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|
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dev->stats.tx_errors++; |
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dev_kfree_skb(skb); |
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return NETDEV_TX_OK; |
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} |
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|
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/* get the beginning of the first cacheline and end of last */ |
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start_addr = ((u64)skb->data & ~(L1_CACHE_BYTES - 1)); |
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end_addr = L1_CACHE_ALIGN((u64)skb_tail_pointer(skb)); |
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|
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/* calculate how many bytes to embed in the XPC message */ |
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if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) { |
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/* skb->data does fit so embed */ |
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embedded_bytes = skb->len; |
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} |
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|
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/* |
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* Since the send occurs asynchronously, we set the count to one |
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* and begin sending. Any sends that happen to complete before |
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* we are done sending will not free the skb. We will be left |
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* with that task during exit. This also handles the case of |
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* a packet destined for a partition which is no longer up. |
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*/ |
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atomic_set(&queued_msg->use_count, 1); |
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queued_msg->skb = skb; |
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|
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if (skb->data[0] == 0xff) { |
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/* we are being asked to broadcast to all partitions */ |
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for_each_set_bit(dest_partid, xpnet_broadcast_partitions, |
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xp_max_npartitions) { |
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|
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xpnet_send(skb, queued_msg, start_addr, end_addr, |
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embedded_bytes, dest_partid); |
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} |
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} else { |
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dest_partid = (short)skb->data[XPNET_PARTID_OCTET + 1]; |
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dest_partid |= (short)skb->data[XPNET_PARTID_OCTET + 0] << 8; |
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|
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if (dest_partid >= 0 && |
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dest_partid < xp_max_npartitions && |
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test_bit(dest_partid, xpnet_broadcast_partitions) != 0) { |
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|
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xpnet_send(skb, queued_msg, start_addr, end_addr, |
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embedded_bytes, dest_partid); |
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} |
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} |
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|
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dev->stats.tx_packets++; |
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dev->stats.tx_bytes += skb->len; |
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|
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if (atomic_dec_return(&queued_msg->use_count) == 0) { |
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dev_kfree_skb(skb); |
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kfree(queued_msg); |
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} |
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|
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return NETDEV_TX_OK; |
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} |
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|
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/* |
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* Deal with transmit timeouts coming from the network layer. |
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*/ |
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static void |
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xpnet_dev_tx_timeout(struct net_device *dev, unsigned int txqueue) |
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{ |
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dev->stats.tx_errors++; |
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} |
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|
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static const struct net_device_ops xpnet_netdev_ops = { |
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.ndo_open = xpnet_dev_open, |
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.ndo_stop = xpnet_dev_stop, |
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.ndo_start_xmit = xpnet_dev_hard_start_xmit, |
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.ndo_tx_timeout = xpnet_dev_tx_timeout, |
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.ndo_set_mac_address = eth_mac_addr, |
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.ndo_validate_addr = eth_validate_addr, |
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}; |
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|
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static int __init |
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xpnet_init(void) |
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{ |
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int result; |
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|
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if (!is_uv_system()) |
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return -ENODEV; |
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|
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dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME); |
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|
|
xpnet_broadcast_partitions = kcalloc(BITS_TO_LONGS(xp_max_npartitions), |
|
sizeof(long), |
|
GFP_KERNEL); |
|
if (xpnet_broadcast_partitions == NULL) |
|
return -ENOMEM; |
|
|
|
/* |
|
* use ether_setup() to init the majority of our device |
|
* structure and then override the necessary pieces. |
|
*/ |
|
xpnet_device = alloc_netdev(0, XPNET_DEVICE_NAME, NET_NAME_UNKNOWN, |
|
ether_setup); |
|
if (xpnet_device == NULL) { |
|
kfree(xpnet_broadcast_partitions); |
|
return -ENOMEM; |
|
} |
|
|
|
netif_carrier_off(xpnet_device); |
|
|
|
xpnet_device->netdev_ops = &xpnet_netdev_ops; |
|
xpnet_device->mtu = XPNET_DEF_MTU; |
|
xpnet_device->min_mtu = XPNET_MIN_MTU; |
|
xpnet_device->max_mtu = XPNET_MAX_MTU; |
|
|
|
/* |
|
* Multicast assumes the LSB of the first octet is set for multicast |
|
* MAC addresses. We chose the first octet of the MAC to be unlikely |
|
* to collide with any vendor's officially issued MAC. |
|
*/ |
|
xpnet_device->dev_addr[0] = 0x02; /* locally administered, no OUI */ |
|
|
|
xpnet_device->dev_addr[XPNET_PARTID_OCTET + 1] = xp_partition_id; |
|
xpnet_device->dev_addr[XPNET_PARTID_OCTET + 0] = (xp_partition_id >> 8); |
|
|
|
/* |
|
* ether_setup() sets this to a multicast device. We are |
|
* really not supporting multicast at this time. |
|
*/ |
|
xpnet_device->flags &= ~IFF_MULTICAST; |
|
|
|
/* |
|
* No need to checksum as it is a DMA transfer. The BTE will |
|
* report an error if the data is not retrievable and the |
|
* packet will be dropped. |
|
*/ |
|
xpnet_device->features = NETIF_F_HW_CSUM; |
|
|
|
result = register_netdev(xpnet_device); |
|
if (result != 0) { |
|
free_netdev(xpnet_device); |
|
kfree(xpnet_broadcast_partitions); |
|
} |
|
|
|
return result; |
|
} |
|
|
|
module_init(xpnet_init); |
|
|
|
static void __exit |
|
xpnet_exit(void) |
|
{ |
|
dev_info(xpnet, "unregistering network device %s\n", |
|
xpnet_device[0].name); |
|
|
|
unregister_netdev(xpnet_device); |
|
free_netdev(xpnet_device); |
|
kfree(xpnet_broadcast_partitions); |
|
} |
|
|
|
module_exit(xpnet_exit); |
|
|
|
MODULE_AUTHOR("Silicon Graphics, Inc."); |
|
MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)"); |
|
MODULE_LICENSE("GPL");
|
|
|