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c835a67733
Extend alloc_netdev{,_mq{,s}}() to take name_assign_type as argument, and convert all users to pass NET_NAME_UNKNOWN. Coccinelle patch: @@ expression sizeof_priv, name, setup, txqs, rxqs, count; @@ ( -alloc_netdev_mqs(sizeof_priv, name, setup, txqs, rxqs) +alloc_netdev_mqs(sizeof_priv, name, NET_NAME_UNKNOWN, setup, txqs, rxqs) | -alloc_netdev_mq(sizeof_priv, name, setup, count) +alloc_netdev_mq(sizeof_priv, name, NET_NAME_UNKNOWN, setup, count) | -alloc_netdev(sizeof_priv, name, setup) +alloc_netdev(sizeof_priv, name, NET_NAME_UNKNOWN, setup) ) v9: move comments here from the wrong commit Signed-off-by: Tom Gundersen <teg@jklm.no> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
609 lines
18 KiB
C
609 lines
18 KiB
C
/*
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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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* Copyright (C) 1999-2009 Silicon Graphics, Inc. All rights reserved.
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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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#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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* 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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struct net_device *xpnet_device;
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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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/* 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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/* Define the XPNET debug device structures to be used with dev_dbg() et al */
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struct device_driver xpnet_dbg_name = {
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.name = "xpnet"
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};
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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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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, %hu)\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%hx) "
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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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static int
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xpnet_dev_change_mtu(struct net_device *dev, int new_mtu)
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{
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/* 68 comes from min TCP+IP+MAC header */
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if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) {
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dev_err(xpnet, "ifconfig %s mtu %d failed; value must be "
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"between 68 and %ld\n", dev->name, new_mtu,
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XPNET_MAX_MTU);
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return -EINVAL;
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}
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dev->mtu = new_mtu;
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dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu);
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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 int
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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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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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* 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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dev->stats.tx_errors++;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
|
|
}
|
|
|
|
/* get the beginning of the first cacheline and end of last */
|
|
start_addr = ((u64)skb->data & ~(L1_CACHE_BYTES - 1));
|
|
end_addr = L1_CACHE_ALIGN((u64)skb_tail_pointer(skb));
|
|
|
|
/* calculate how many bytes to embed in the XPC message */
|
|
if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) {
|
|
/* skb->data does fit so embed */
|
|
embedded_bytes = skb->len;
|
|
}
|
|
|
|
/*
|
|
* Since the send occurs asynchronously, we set the count to one
|
|
* and begin sending. Any sends that happen to complete before
|
|
* we are done sending will not free the skb. We will be left
|
|
* with that task during exit. This also handles the case of
|
|
* a packet destined for a partition which is no longer up.
|
|
*/
|
|
atomic_set(&queued_msg->use_count, 1);
|
|
queued_msg->skb = skb;
|
|
|
|
if (skb->data[0] == 0xff) {
|
|
/* we are being asked to broadcast to all partitions */
|
|
for_each_set_bit(dest_partid, xpnet_broadcast_partitions,
|
|
xp_max_npartitions) {
|
|
|
|
xpnet_send(skb, queued_msg, start_addr, end_addr,
|
|
embedded_bytes, dest_partid);
|
|
}
|
|
} else {
|
|
dest_partid = (short)skb->data[XPNET_PARTID_OCTET + 1];
|
|
dest_partid |= (short)skb->data[XPNET_PARTID_OCTET + 0] << 8;
|
|
|
|
if (dest_partid >= 0 &&
|
|
dest_partid < xp_max_npartitions &&
|
|
test_bit(dest_partid, xpnet_broadcast_partitions) != 0) {
|
|
|
|
xpnet_send(skb, queued_msg, start_addr, end_addr,
|
|
embedded_bytes, dest_partid);
|
|
}
|
|
}
|
|
|
|
dev->stats.tx_packets++;
|
|
dev->stats.tx_bytes += skb->len;
|
|
|
|
if (atomic_dec_return(&queued_msg->use_count) == 0) {
|
|
dev_kfree_skb(skb);
|
|
kfree(queued_msg);
|
|
}
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
/*
|
|
* Deal with transmit timeouts coming from the network layer.
|
|
*/
|
|
static void
|
|
xpnet_dev_tx_timeout(struct net_device *dev)
|
|
{
|
|
dev->stats.tx_errors++;
|
|
}
|
|
|
|
static const struct net_device_ops xpnet_netdev_ops = {
|
|
.ndo_open = xpnet_dev_open,
|
|
.ndo_stop = xpnet_dev_stop,
|
|
.ndo_start_xmit = xpnet_dev_hard_start_xmit,
|
|
.ndo_change_mtu = xpnet_dev_change_mtu,
|
|
.ndo_tx_timeout = xpnet_dev_tx_timeout,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
};
|
|
|
|
static int __init
|
|
xpnet_init(void)
|
|
{
|
|
int result;
|
|
|
|
if (!is_shub() && !is_uv())
|
|
return -ENODEV;
|
|
|
|
dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME);
|
|
|
|
xpnet_broadcast_partitions = kzalloc(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;
|
|
|
|
/*
|
|
* 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");
|