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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/drivers/vector_kern.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/um/drivers/vector_kern.c')
-rw-r--r--arch/um/drivers/vector_kern.c1766
1 files changed, 1766 insertions, 0 deletions
diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
new file mode 100644
index 000000000..131b7cb29
--- /dev/null
+++ b/arch/um/drivers/vector_kern.c
@@ -0,0 +1,1766 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017 - 2019 Cambridge Greys Limited
+ * Copyright (C) 2011 - 2014 Cisco Systems Inc
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ */
+
+#include <linux/memblock.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/firmware.h>
+#include <linux/fs.h>
+#include <uapi/linux/filter.h>
+#include <init.h>
+#include <irq_kern.h>
+#include <irq_user.h>
+#include <net_kern.h>
+#include <os.h>
+#include "mconsole_kern.h"
+#include "vector_user.h"
+#include "vector_kern.h"
+
+/*
+ * Adapted from network devices with the following major changes:
+ * All transports are static - simplifies the code significantly
+ * Multiple FDs/IRQs per device
+ * Vector IO optionally used for read/write, falling back to legacy
+ * based on configuration and/or availability
+ * Configuration is no longer positional - L2TPv3 and GRE require up to
+ * 10 parameters, passing this as positional is not fit for purpose.
+ * Only socket transports are supported
+ */
+
+
+#define DRIVER_NAME "uml-vector"
+struct vector_cmd_line_arg {
+ struct list_head list;
+ int unit;
+ char *arguments;
+};
+
+struct vector_device {
+ struct list_head list;
+ struct net_device *dev;
+ struct platform_device pdev;
+ int unit;
+ int opened;
+};
+
+static LIST_HEAD(vec_cmd_line);
+
+static DEFINE_SPINLOCK(vector_devices_lock);
+static LIST_HEAD(vector_devices);
+
+static int driver_registered;
+
+static void vector_eth_configure(int n, struct arglist *def);
+static int vector_mmsg_rx(struct vector_private *vp, int budget);
+
+/* Argument accessors to set variables (and/or set default values)
+ * mtu, buffer sizing, default headroom, etc
+ */
+
+#define DEFAULT_HEADROOM 2
+#define SAFETY_MARGIN 32
+#define DEFAULT_VECTOR_SIZE 64
+#define TX_SMALL_PACKET 128
+#define MAX_IOV_SIZE (MAX_SKB_FRAGS + 1)
+
+static const struct {
+ const char string[ETH_GSTRING_LEN];
+} ethtool_stats_keys[] = {
+ { "rx_queue_max" },
+ { "rx_queue_running_average" },
+ { "tx_queue_max" },
+ { "tx_queue_running_average" },
+ { "rx_encaps_errors" },
+ { "tx_timeout_count" },
+ { "tx_restart_queue" },
+ { "tx_kicks" },
+ { "tx_flow_control_xon" },
+ { "tx_flow_control_xoff" },
+ { "rx_csum_offload_good" },
+ { "rx_csum_offload_errors"},
+ { "sg_ok"},
+ { "sg_linearized"},
+};
+
+#define VECTOR_NUM_STATS ARRAY_SIZE(ethtool_stats_keys)
+
+static void vector_reset_stats(struct vector_private *vp)
+{
+ vp->estats.rx_queue_max = 0;
+ vp->estats.rx_queue_running_average = 0;
+ vp->estats.tx_queue_max = 0;
+ vp->estats.tx_queue_running_average = 0;
+ vp->estats.rx_encaps_errors = 0;
+ vp->estats.tx_timeout_count = 0;
+ vp->estats.tx_restart_queue = 0;
+ vp->estats.tx_kicks = 0;
+ vp->estats.tx_flow_control_xon = 0;
+ vp->estats.tx_flow_control_xoff = 0;
+ vp->estats.sg_ok = 0;
+ vp->estats.sg_linearized = 0;
+}
+
+static int get_mtu(struct arglist *def)
+{
+ char *mtu = uml_vector_fetch_arg(def, "mtu");
+ long result;
+
+ if (mtu != NULL) {
+ if (kstrtoul(mtu, 10, &result) == 0)
+ if ((result < (1 << 16) - 1) && (result >= 576))
+ return result;
+ }
+ return ETH_MAX_PACKET;
+}
+
+static char *get_bpf_file(struct arglist *def)
+{
+ return uml_vector_fetch_arg(def, "bpffile");
+}
+
+static bool get_bpf_flash(struct arglist *def)
+{
+ char *allow = uml_vector_fetch_arg(def, "bpfflash");
+ long result;
+
+ if (allow != NULL) {
+ if (kstrtoul(allow, 10, &result) == 0)
+ return (allow > 0);
+ }
+ return false;
+}
+
+static int get_depth(struct arglist *def)
+{
+ char *mtu = uml_vector_fetch_arg(def, "depth");
+ long result;
+
+ if (mtu != NULL) {
+ if (kstrtoul(mtu, 10, &result) == 0)
+ return result;
+ }
+ return DEFAULT_VECTOR_SIZE;
+}
+
+static int get_headroom(struct arglist *def)
+{
+ char *mtu = uml_vector_fetch_arg(def, "headroom");
+ long result;
+
+ if (mtu != NULL) {
+ if (kstrtoul(mtu, 10, &result) == 0)
+ return result;
+ }
+ return DEFAULT_HEADROOM;
+}
+
+static int get_req_size(struct arglist *def)
+{
+ char *gro = uml_vector_fetch_arg(def, "gro");
+ long result;
+
+ if (gro != NULL) {
+ if (kstrtoul(gro, 10, &result) == 0) {
+ if (result > 0)
+ return 65536;
+ }
+ }
+ return get_mtu(def) + ETH_HEADER_OTHER +
+ get_headroom(def) + SAFETY_MARGIN;
+}
+
+
+static int get_transport_options(struct arglist *def)
+{
+ char *transport = uml_vector_fetch_arg(def, "transport");
+ char *vector = uml_vector_fetch_arg(def, "vec");
+
+ int vec_rx = VECTOR_RX;
+ int vec_tx = VECTOR_TX;
+ long parsed;
+ int result = 0;
+
+ if (transport == NULL)
+ return -EINVAL;
+
+ if (vector != NULL) {
+ if (kstrtoul(vector, 10, &parsed) == 0) {
+ if (parsed == 0) {
+ vec_rx = 0;
+ vec_tx = 0;
+ }
+ }
+ }
+
+ if (get_bpf_flash(def))
+ result = VECTOR_BPF_FLASH;
+
+ if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
+ return result;
+ if (strncmp(transport, TRANS_HYBRID, TRANS_HYBRID_LEN) == 0)
+ return (result | vec_rx | VECTOR_BPF);
+ if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
+ return (result | vec_rx | vec_tx | VECTOR_QDISC_BYPASS);
+ return (result | vec_rx | vec_tx);
+}
+
+
+/* A mini-buffer for packet drop read
+ * All of our supported transports are datagram oriented and we always
+ * read using recvmsg or recvmmsg. If we pass a buffer which is smaller
+ * than the packet size it still counts as full packet read and will
+ * clean the incoming stream to keep sigio/epoll happy
+ */
+
+#define DROP_BUFFER_SIZE 32
+
+static char *drop_buffer;
+
+/* Array backed queues optimized for bulk enqueue/dequeue and
+ * 1:N (small values of N) or 1:1 enqueuer/dequeuer ratios.
+ * For more details and full design rationale see
+ * http://foswiki.cambridgegreys.com/Main/EatYourTailAndEnjoyIt
+ */
+
+
+/*
+ * Advance the mmsg queue head by n = advance. Resets the queue to
+ * maximum enqueue/dequeue-at-once capacity if possible. Called by
+ * dequeuers. Caller must hold the head_lock!
+ */
+
+static int vector_advancehead(struct vector_queue *qi, int advance)
+{
+ int queue_depth;
+
+ qi->head =
+ (qi->head + advance)
+ % qi->max_depth;
+
+
+ spin_lock(&qi->tail_lock);
+ qi->queue_depth -= advance;
+
+ /* we are at 0, use this to
+ * reset head and tail so we can use max size vectors
+ */
+
+ if (qi->queue_depth == 0) {
+ qi->head = 0;
+ qi->tail = 0;
+ }
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->tail_lock);
+ return queue_depth;
+}
+
+/* Advance the queue tail by n = advance.
+ * This is called by enqueuers which should hold the
+ * head lock already
+ */
+
+static int vector_advancetail(struct vector_queue *qi, int advance)
+{
+ int queue_depth;
+
+ qi->tail =
+ (qi->tail + advance)
+ % qi->max_depth;
+ spin_lock(&qi->head_lock);
+ qi->queue_depth += advance;
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->head_lock);
+ return queue_depth;
+}
+
+static int prep_msg(struct vector_private *vp,
+ struct sk_buff *skb,
+ struct iovec *iov)
+{
+ int iov_index = 0;
+ int nr_frags, frag;
+ skb_frag_t *skb_frag;
+
+ nr_frags = skb_shinfo(skb)->nr_frags;
+ if (nr_frags > MAX_IOV_SIZE) {
+ if (skb_linearize(skb) != 0)
+ goto drop;
+ }
+ if (vp->header_size > 0) {
+ iov[iov_index].iov_len = vp->header_size;
+ vp->form_header(iov[iov_index].iov_base, skb, vp);
+ iov_index++;
+ }
+ iov[iov_index].iov_base = skb->data;
+ if (nr_frags > 0) {
+ iov[iov_index].iov_len = skb->len - skb->data_len;
+ vp->estats.sg_ok++;
+ } else
+ iov[iov_index].iov_len = skb->len;
+ iov_index++;
+ for (frag = 0; frag < nr_frags; frag++) {
+ skb_frag = &skb_shinfo(skb)->frags[frag];
+ iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
+ iov[iov_index].iov_len = skb_frag_size(skb_frag);
+ iov_index++;
+ }
+ return iov_index;
+drop:
+ return -1;
+}
+/*
+ * Generic vector enqueue with support for forming headers using transport
+ * specific callback. Allows GRE, L2TPv3, RAW and other transports
+ * to use a common enqueue procedure in vector mode
+ */
+
+static int vector_enqueue(struct vector_queue *qi, struct sk_buff *skb)
+{
+ struct vector_private *vp = netdev_priv(qi->dev);
+ int queue_depth;
+ int packet_len;
+ struct mmsghdr *mmsg_vector = qi->mmsg_vector;
+ int iov_count;
+
+ spin_lock(&qi->tail_lock);
+ spin_lock(&qi->head_lock);
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->head_lock);
+
+ if (skb)
+ packet_len = skb->len;
+
+ if (queue_depth < qi->max_depth) {
+
+ *(qi->skbuff_vector + qi->tail) = skb;
+ mmsg_vector += qi->tail;
+ iov_count = prep_msg(
+ vp,
+ skb,
+ mmsg_vector->msg_hdr.msg_iov
+ );
+ if (iov_count < 1)
+ goto drop;
+ mmsg_vector->msg_hdr.msg_iovlen = iov_count;
+ mmsg_vector->msg_hdr.msg_name = vp->fds->remote_addr;
+ mmsg_vector->msg_hdr.msg_namelen = vp->fds->remote_addr_size;
+ queue_depth = vector_advancetail(qi, 1);
+ } else
+ goto drop;
+ spin_unlock(&qi->tail_lock);
+ return queue_depth;
+drop:
+ qi->dev->stats.tx_dropped++;
+ if (skb != NULL) {
+ packet_len = skb->len;
+ dev_consume_skb_any(skb);
+ netdev_completed_queue(qi->dev, 1, packet_len);
+ }
+ spin_unlock(&qi->tail_lock);
+ return queue_depth;
+}
+
+static int consume_vector_skbs(struct vector_queue *qi, int count)
+{
+ struct sk_buff *skb;
+ int skb_index;
+ int bytes_compl = 0;
+
+ for (skb_index = qi->head; skb_index < qi->head + count; skb_index++) {
+ skb = *(qi->skbuff_vector + skb_index);
+ /* mark as empty to ensure correct destruction if
+ * needed
+ */
+ bytes_compl += skb->len;
+ *(qi->skbuff_vector + skb_index) = NULL;
+ dev_consume_skb_any(skb);
+ }
+ qi->dev->stats.tx_bytes += bytes_compl;
+ qi->dev->stats.tx_packets += count;
+ netdev_completed_queue(qi->dev, count, bytes_compl);
+ return vector_advancehead(qi, count);
+}
+
+/*
+ * Generic vector deque via sendmmsg with support for forming headers
+ * using transport specific callback. Allows GRE, L2TPv3, RAW and
+ * other transports to use a common dequeue procedure in vector mode
+ */
+
+
+static int vector_send(struct vector_queue *qi)
+{
+ struct vector_private *vp = netdev_priv(qi->dev);
+ struct mmsghdr *send_from;
+ int result = 0, send_len, queue_depth = qi->max_depth;
+
+ if (spin_trylock(&qi->head_lock)) {
+ if (spin_trylock(&qi->tail_lock)) {
+ /* update queue_depth to current value */
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->tail_lock);
+ while (queue_depth > 0) {
+ /* Calculate the start of the vector */
+ send_len = queue_depth;
+ send_from = qi->mmsg_vector;
+ send_from += qi->head;
+ /* Adjust vector size if wraparound */
+ if (send_len + qi->head > qi->max_depth)
+ send_len = qi->max_depth - qi->head;
+ /* Try to TX as many packets as possible */
+ if (send_len > 0) {
+ result = uml_vector_sendmmsg(
+ vp->fds->tx_fd,
+ send_from,
+ send_len,
+ 0
+ );
+ vp->in_write_poll =
+ (result != send_len);
+ }
+ /* For some of the sendmmsg error scenarios
+ * we may end being unsure in the TX success
+ * for all packets. It is safer to declare
+ * them all TX-ed and blame the network.
+ */
+ if (result < 0) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "sendmmsg err=%i\n",
+ result);
+ vp->in_error = true;
+ result = send_len;
+ }
+ if (result > 0) {
+ queue_depth =
+ consume_vector_skbs(qi, result);
+ /* This is equivalent to an TX IRQ.
+ * Restart the upper layers to feed us
+ * more packets.
+ */
+ if (result > vp->estats.tx_queue_max)
+ vp->estats.tx_queue_max = result;
+ vp->estats.tx_queue_running_average =
+ (vp->estats.tx_queue_running_average + result) >> 1;
+ }
+ netif_wake_queue(qi->dev);
+ /* if TX is busy, break out of the send loop,
+ * poll write IRQ will reschedule xmit for us
+ */
+ if (result != send_len) {
+ vp->estats.tx_restart_queue++;
+ break;
+ }
+ }
+ }
+ spin_unlock(&qi->head_lock);
+ }
+ return queue_depth;
+}
+
+/* Queue destructor. Deliberately stateless so we can use
+ * it in queue cleanup if initialization fails.
+ */
+
+static void destroy_queue(struct vector_queue *qi)
+{
+ int i;
+ struct iovec *iov;
+ struct vector_private *vp = netdev_priv(qi->dev);
+ struct mmsghdr *mmsg_vector;
+
+ if (qi == NULL)
+ return;
+ /* deallocate any skbuffs - we rely on any unused to be
+ * set to NULL.
+ */
+ if (qi->skbuff_vector != NULL) {
+ for (i = 0; i < qi->max_depth; i++) {
+ if (*(qi->skbuff_vector + i) != NULL)
+ dev_kfree_skb_any(*(qi->skbuff_vector + i));
+ }
+ kfree(qi->skbuff_vector);
+ }
+ /* deallocate matching IOV structures including header buffs */
+ if (qi->mmsg_vector != NULL) {
+ mmsg_vector = qi->mmsg_vector;
+ for (i = 0; i < qi->max_depth; i++) {
+ iov = mmsg_vector->msg_hdr.msg_iov;
+ if (iov != NULL) {
+ if ((vp->header_size > 0) &&
+ (iov->iov_base != NULL))
+ kfree(iov->iov_base);
+ kfree(iov);
+ }
+ mmsg_vector++;
+ }
+ kfree(qi->mmsg_vector);
+ }
+ kfree(qi);
+}
+
+/*
+ * Queue constructor. Create a queue with a given side.
+ */
+static struct vector_queue *create_queue(
+ struct vector_private *vp,
+ int max_size,
+ int header_size,
+ int num_extra_frags)
+{
+ struct vector_queue *result;
+ int i;
+ struct iovec *iov;
+ struct mmsghdr *mmsg_vector;
+
+ result = kmalloc(sizeof(struct vector_queue), GFP_KERNEL);
+ if (result == NULL)
+ return NULL;
+ result->max_depth = max_size;
+ result->dev = vp->dev;
+ result->mmsg_vector = kmalloc(
+ (sizeof(struct mmsghdr) * max_size), GFP_KERNEL);
+ if (result->mmsg_vector == NULL)
+ goto out_mmsg_fail;
+ result->skbuff_vector = kmalloc(
+ (sizeof(void *) * max_size), GFP_KERNEL);
+ if (result->skbuff_vector == NULL)
+ goto out_skb_fail;
+
+ /* further failures can be handled safely by destroy_queue*/
+
+ mmsg_vector = result->mmsg_vector;
+ for (i = 0; i < max_size; i++) {
+ /* Clear all pointers - we use non-NULL as marking on
+ * what to free on destruction
+ */
+ *(result->skbuff_vector + i) = NULL;
+ mmsg_vector->msg_hdr.msg_iov = NULL;
+ mmsg_vector++;
+ }
+ mmsg_vector = result->mmsg_vector;
+ result->max_iov_frags = num_extra_frags;
+ for (i = 0; i < max_size; i++) {
+ if (vp->header_size > 0)
+ iov = kmalloc_array(3 + num_extra_frags,
+ sizeof(struct iovec),
+ GFP_KERNEL
+ );
+ else
+ iov = kmalloc_array(2 + num_extra_frags,
+ sizeof(struct iovec),
+ GFP_KERNEL
+ );
+ if (iov == NULL)
+ goto out_fail;
+ mmsg_vector->msg_hdr.msg_iov = iov;
+ mmsg_vector->msg_hdr.msg_iovlen = 1;
+ mmsg_vector->msg_hdr.msg_control = NULL;
+ mmsg_vector->msg_hdr.msg_controllen = 0;
+ mmsg_vector->msg_hdr.msg_flags = MSG_DONTWAIT;
+ mmsg_vector->msg_hdr.msg_name = NULL;
+ mmsg_vector->msg_hdr.msg_namelen = 0;
+ if (vp->header_size > 0) {
+ iov->iov_base = kmalloc(header_size, GFP_KERNEL);
+ if (iov->iov_base == NULL)
+ goto out_fail;
+ iov->iov_len = header_size;
+ mmsg_vector->msg_hdr.msg_iovlen = 2;
+ iov++;
+ }
+ iov->iov_base = NULL;
+ iov->iov_len = 0;
+ mmsg_vector++;
+ }
+ spin_lock_init(&result->head_lock);
+ spin_lock_init(&result->tail_lock);
+ result->queue_depth = 0;
+ result->head = 0;
+ result->tail = 0;
+ return result;
+out_skb_fail:
+ kfree(result->mmsg_vector);
+out_mmsg_fail:
+ kfree(result);
+ return NULL;
+out_fail:
+ destroy_queue(result);
+ return NULL;
+}
+
+/*
+ * We do not use the RX queue as a proper wraparound queue for now
+ * This is not necessary because the consumption via napi_gro_receive()
+ * happens in-line. While we can try using the return code of
+ * netif_rx() for flow control there are no drivers doing this today.
+ * For this RX specific use we ignore the tail/head locks and
+ * just read into a prepared queue filled with skbuffs.
+ */
+
+static struct sk_buff *prep_skb(
+ struct vector_private *vp,
+ struct user_msghdr *msg)
+{
+ int linear = vp->max_packet + vp->headroom + SAFETY_MARGIN;
+ struct sk_buff *result;
+ int iov_index = 0, len;
+ struct iovec *iov = msg->msg_iov;
+ int err, nr_frags, frag;
+ skb_frag_t *skb_frag;
+
+ if (vp->req_size <= linear)
+ len = linear;
+ else
+ len = vp->req_size;
+ result = alloc_skb_with_frags(
+ linear,
+ len - vp->max_packet,
+ 3,
+ &err,
+ GFP_ATOMIC
+ );
+ if (vp->header_size > 0)
+ iov_index++;
+ if (result == NULL) {
+ iov[iov_index].iov_base = NULL;
+ iov[iov_index].iov_len = 0;
+ goto done;
+ }
+ skb_reserve(result, vp->headroom);
+ result->dev = vp->dev;
+ skb_put(result, vp->max_packet);
+ result->data_len = len - vp->max_packet;
+ result->len += len - vp->max_packet;
+ skb_reset_mac_header(result);
+ result->ip_summed = CHECKSUM_NONE;
+ iov[iov_index].iov_base = result->data;
+ iov[iov_index].iov_len = vp->max_packet;
+ iov_index++;
+
+ nr_frags = skb_shinfo(result)->nr_frags;
+ for (frag = 0; frag < nr_frags; frag++) {
+ skb_frag = &skb_shinfo(result)->frags[frag];
+ iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
+ if (iov[iov_index].iov_base != NULL)
+ iov[iov_index].iov_len = skb_frag_size(skb_frag);
+ else
+ iov[iov_index].iov_len = 0;
+ iov_index++;
+ }
+done:
+ msg->msg_iovlen = iov_index;
+ return result;
+}
+
+
+/* Prepare queue for recvmmsg one-shot rx - fill with fresh sk_buffs*/
+
+static void prep_queue_for_rx(struct vector_queue *qi)
+{
+ struct vector_private *vp = netdev_priv(qi->dev);
+ struct mmsghdr *mmsg_vector = qi->mmsg_vector;
+ void **skbuff_vector = qi->skbuff_vector;
+ int i;
+
+ if (qi->queue_depth == 0)
+ return;
+ for (i = 0; i < qi->queue_depth; i++) {
+ /* it is OK if allocation fails - recvmmsg with NULL data in
+ * iov argument still performs an RX, just drops the packet
+ * This allows us stop faffing around with a "drop buffer"
+ */
+
+ *skbuff_vector = prep_skb(vp, &mmsg_vector->msg_hdr);
+ skbuff_vector++;
+ mmsg_vector++;
+ }
+ qi->queue_depth = 0;
+}
+
+static struct vector_device *find_device(int n)
+{
+ struct vector_device *device;
+ struct list_head *ele;
+
+ spin_lock(&vector_devices_lock);
+ list_for_each(ele, &vector_devices) {
+ device = list_entry(ele, struct vector_device, list);
+ if (device->unit == n)
+ goto out;
+ }
+ device = NULL;
+ out:
+ spin_unlock(&vector_devices_lock);
+ return device;
+}
+
+static int vector_parse(char *str, int *index_out, char **str_out,
+ char **error_out)
+{
+ int n, len, err;
+ char *start = str;
+
+ len = strlen(str);
+
+ while ((*str != ':') && (strlen(str) > 1))
+ str++;
+ if (*str != ':') {
+ *error_out = "Expected ':' after device number";
+ return -EINVAL;
+ }
+ *str = '\0';
+
+ err = kstrtouint(start, 0, &n);
+ if (err < 0) {
+ *error_out = "Bad device number";
+ return err;
+ }
+
+ str++;
+ if (find_device(n)) {
+ *error_out = "Device already configured";
+ return -EINVAL;
+ }
+
+ *index_out = n;
+ *str_out = str;
+ return 0;
+}
+
+static int vector_config(char *str, char **error_out)
+{
+ int err, n;
+ char *params;
+ struct arglist *parsed;
+
+ err = vector_parse(str, &n, &params, error_out);
+ if (err != 0)
+ return err;
+
+ /* This string is broken up and the pieces used by the underlying
+ * driver. We should copy it to make sure things do not go wrong
+ * later.
+ */
+
+ params = kstrdup(params, GFP_KERNEL);
+ if (params == NULL) {
+ *error_out = "vector_config failed to strdup string";
+ return -ENOMEM;
+ }
+
+ parsed = uml_parse_vector_ifspec(params);
+
+ if (parsed == NULL) {
+ *error_out = "vector_config failed to parse parameters";
+ kfree(params);
+ return -EINVAL;
+ }
+
+ vector_eth_configure(n, parsed);
+ return 0;
+}
+
+static int vector_id(char **str, int *start_out, int *end_out)
+{
+ char *end;
+ int n;
+
+ n = simple_strtoul(*str, &end, 0);
+ if ((*end != '\0') || (end == *str))
+ return -1;
+
+ *start_out = n;
+ *end_out = n;
+ *str = end;
+ return n;
+}
+
+static int vector_remove(int n, char **error_out)
+{
+ struct vector_device *vec_d;
+ struct net_device *dev;
+ struct vector_private *vp;
+
+ vec_d = find_device(n);
+ if (vec_d == NULL)
+ return -ENODEV;
+ dev = vec_d->dev;
+ vp = netdev_priv(dev);
+ if (vp->fds != NULL)
+ return -EBUSY;
+ unregister_netdev(dev);
+ platform_device_unregister(&vec_d->pdev);
+ return 0;
+}
+
+/*
+ * There is no shared per-transport initialization code, so
+ * we will just initialize each interface one by one and
+ * add them to a list
+ */
+
+static struct platform_driver uml_net_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+
+static void vector_device_release(struct device *dev)
+{
+ struct vector_device *device = dev_get_drvdata(dev);
+ struct net_device *netdev = device->dev;
+
+ list_del(&device->list);
+ kfree(device);
+ free_netdev(netdev);
+}
+
+/* Bog standard recv using recvmsg - not used normally unless the user
+ * explicitly specifies not to use recvmmsg vector RX.
+ */
+
+static int vector_legacy_rx(struct vector_private *vp)
+{
+ int pkt_len;
+ struct user_msghdr hdr;
+ struct iovec iov[2 + MAX_IOV_SIZE]; /* header + data use case only */
+ int iovpos = 0;
+ struct sk_buff *skb;
+ int header_check;
+
+ hdr.msg_name = NULL;
+ hdr.msg_namelen = 0;
+ hdr.msg_iov = (struct iovec *) &iov;
+ hdr.msg_control = NULL;
+ hdr.msg_controllen = 0;
+ hdr.msg_flags = 0;
+
+ if (vp->header_size > 0) {
+ iov[0].iov_base = vp->header_rxbuffer;
+ iov[0].iov_len = vp->header_size;
+ }
+
+ skb = prep_skb(vp, &hdr);
+
+ if (skb == NULL) {
+ /* Read a packet into drop_buffer and don't do
+ * anything with it.
+ */
+ iov[iovpos].iov_base = drop_buffer;
+ iov[iovpos].iov_len = DROP_BUFFER_SIZE;
+ hdr.msg_iovlen = 1;
+ vp->dev->stats.rx_dropped++;
+ }
+
+ pkt_len = uml_vector_recvmsg(vp->fds->rx_fd, &hdr, 0);
+ if (pkt_len < 0) {
+ vp->in_error = true;
+ return pkt_len;
+ }
+
+ if (skb != NULL) {
+ if (pkt_len > vp->header_size) {
+ if (vp->header_size > 0) {
+ header_check = vp->verify_header(
+ vp->header_rxbuffer, skb, vp);
+ if (header_check < 0) {
+ dev_kfree_skb_irq(skb);
+ vp->dev->stats.rx_dropped++;
+ vp->estats.rx_encaps_errors++;
+ return 0;
+ }
+ if (header_check > 0) {
+ vp->estats.rx_csum_offload_good++;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ }
+ pskb_trim(skb, pkt_len - vp->rx_header_size);
+ skb->protocol = eth_type_trans(skb, skb->dev);
+ vp->dev->stats.rx_bytes += skb->len;
+ vp->dev->stats.rx_packets++;
+ napi_gro_receive(&vp->napi, skb);
+ } else {
+ dev_kfree_skb_irq(skb);
+ }
+ }
+ return pkt_len;
+}
+
+/*
+ * Packet at a time TX which falls back to vector TX if the
+ * underlying transport is busy.
+ */
+
+
+
+static int writev_tx(struct vector_private *vp, struct sk_buff *skb)
+{
+ struct iovec iov[3 + MAX_IOV_SIZE];
+ int iov_count, pkt_len = 0;
+
+ iov[0].iov_base = vp->header_txbuffer;
+ iov_count = prep_msg(vp, skb, (struct iovec *) &iov);
+
+ if (iov_count < 1)
+ goto drop;
+
+ pkt_len = uml_vector_writev(
+ vp->fds->tx_fd,
+ (struct iovec *) &iov,
+ iov_count
+ );
+
+ if (pkt_len < 0)
+ goto drop;
+
+ netif_trans_update(vp->dev);
+ netif_wake_queue(vp->dev);
+
+ if (pkt_len > 0) {
+ vp->dev->stats.tx_bytes += skb->len;
+ vp->dev->stats.tx_packets++;
+ } else {
+ vp->dev->stats.tx_dropped++;
+ }
+ consume_skb(skb);
+ return pkt_len;
+drop:
+ vp->dev->stats.tx_dropped++;
+ consume_skb(skb);
+ if (pkt_len < 0)
+ vp->in_error = true;
+ return pkt_len;
+}
+
+/*
+ * Receive as many messages as we can in one call using the special
+ * mmsg vector matched to an skb vector which we prepared earlier.
+ */
+
+static int vector_mmsg_rx(struct vector_private *vp, int budget)
+{
+ int packet_count, i;
+ struct vector_queue *qi = vp->rx_queue;
+ struct sk_buff *skb;
+ struct mmsghdr *mmsg_vector = qi->mmsg_vector;
+ void **skbuff_vector = qi->skbuff_vector;
+ int header_check;
+
+ /* Refresh the vector and make sure it is with new skbs and the
+ * iovs are updated to point to them.
+ */
+
+ prep_queue_for_rx(qi);
+
+ /* Fire the Lazy Gun - get as many packets as we can in one go. */
+
+ if (budget > qi->max_depth)
+ budget = qi->max_depth;
+
+ packet_count = uml_vector_recvmmsg(
+ vp->fds->rx_fd, qi->mmsg_vector, qi->max_depth, 0);
+
+ if (packet_count < 0)
+ vp->in_error = true;
+
+ if (packet_count <= 0)
+ return packet_count;
+
+ /* We treat packet processing as enqueue, buffer refresh as dequeue
+ * The queue_depth tells us how many buffers have been used and how
+ * many do we need to prep the next time prep_queue_for_rx() is called.
+ */
+
+ qi->queue_depth = packet_count;
+
+ for (i = 0; i < packet_count; i++) {
+ skb = (*skbuff_vector);
+ if (mmsg_vector->msg_len > vp->header_size) {
+ if (vp->header_size > 0) {
+ header_check = vp->verify_header(
+ mmsg_vector->msg_hdr.msg_iov->iov_base,
+ skb,
+ vp
+ );
+ if (header_check < 0) {
+ /* Overlay header failed to verify - discard.
+ * We can actually keep this skb and reuse it,
+ * but that will make the prep logic too
+ * complex.
+ */
+ dev_kfree_skb_irq(skb);
+ vp->estats.rx_encaps_errors++;
+ continue;
+ }
+ if (header_check > 0) {
+ vp->estats.rx_csum_offload_good++;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ }
+ pskb_trim(skb,
+ mmsg_vector->msg_len - vp->rx_header_size);
+ skb->protocol = eth_type_trans(skb, skb->dev);
+ /*
+ * We do not need to lock on updating stats here
+ * The interrupt loop is non-reentrant.
+ */
+ vp->dev->stats.rx_bytes += skb->len;
+ vp->dev->stats.rx_packets++;
+ napi_gro_receive(&vp->napi, skb);
+ } else {
+ /* Overlay header too short to do anything - discard.
+ * We can actually keep this skb and reuse it,
+ * but that will make the prep logic too complex.
+ */
+ if (skb != NULL)
+ dev_kfree_skb_irq(skb);
+ }
+ (*skbuff_vector) = NULL;
+ /* Move to the next buffer element */
+ mmsg_vector++;
+ skbuff_vector++;
+ }
+ if (packet_count > 0) {
+ if (vp->estats.rx_queue_max < packet_count)
+ vp->estats.rx_queue_max = packet_count;
+ vp->estats.rx_queue_running_average =
+ (vp->estats.rx_queue_running_average + packet_count) >> 1;
+ }
+ return packet_count;
+}
+
+static int vector_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ int queue_depth = 0;
+
+ if (vp->in_error) {
+ deactivate_fd(vp->fds->rx_fd, vp->rx_irq);
+ if ((vp->fds->rx_fd != vp->fds->tx_fd) && (vp->tx_irq != 0))
+ deactivate_fd(vp->fds->tx_fd, vp->tx_irq);
+ return NETDEV_TX_BUSY;
+ }
+
+ if ((vp->options & VECTOR_TX) == 0) {
+ writev_tx(vp, skb);
+ return NETDEV_TX_OK;
+ }
+
+ /* We do BQL only in the vector path, no point doing it in
+ * packet at a time mode as there is no device queue
+ */
+
+ netdev_sent_queue(vp->dev, skb->len);
+ queue_depth = vector_enqueue(vp->tx_queue, skb);
+
+ if (queue_depth < vp->tx_queue->max_depth && netdev_xmit_more()) {
+ mod_timer(&vp->tl, vp->coalesce);
+ return NETDEV_TX_OK;
+ } else {
+ queue_depth = vector_send(vp->tx_queue);
+ if (queue_depth > 0)
+ napi_schedule(&vp->napi);
+ }
+
+ return NETDEV_TX_OK;
+}
+
+static irqreturn_t vector_rx_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct vector_private *vp = netdev_priv(dev);
+
+ if (!netif_running(dev))
+ return IRQ_NONE;
+ napi_schedule(&vp->napi);
+ return IRQ_HANDLED;
+
+}
+
+static irqreturn_t vector_tx_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct vector_private *vp = netdev_priv(dev);
+
+ if (!netif_running(dev))
+ return IRQ_NONE;
+ /* We need to pay attention to it only if we got
+ * -EAGAIN or -ENOBUFFS from sendmmsg. Otherwise
+ * we ignore it. In the future, it may be worth
+ * it to improve the IRQ controller a bit to make
+ * tweaking the IRQ mask less costly
+ */
+
+ napi_schedule(&vp->napi);
+ return IRQ_HANDLED;
+
+}
+
+static int irq_rr;
+
+static int vector_net_close(struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ unsigned long flags;
+
+ netif_stop_queue(dev);
+ del_timer(&vp->tl);
+
+ if (vp->fds == NULL)
+ return 0;
+
+ /* Disable and free all IRQS */
+ if (vp->rx_irq > 0) {
+ um_free_irq(vp->rx_irq, dev);
+ vp->rx_irq = 0;
+ }
+ if (vp->tx_irq > 0) {
+ um_free_irq(vp->tx_irq, dev);
+ vp->tx_irq = 0;
+ }
+ napi_disable(&vp->napi);
+ netif_napi_del(&vp->napi);
+ if (vp->fds->rx_fd > 0) {
+ if (vp->bpf)
+ uml_vector_detach_bpf(vp->fds->rx_fd, vp->bpf);
+ os_close_file(vp->fds->rx_fd);
+ vp->fds->rx_fd = -1;
+ }
+ if (vp->fds->tx_fd > 0) {
+ os_close_file(vp->fds->tx_fd);
+ vp->fds->tx_fd = -1;
+ }
+ if (vp->bpf != NULL)
+ kfree(vp->bpf->filter);
+ kfree(vp->bpf);
+ vp->bpf = NULL;
+ kfree(vp->fds->remote_addr);
+ kfree(vp->transport_data);
+ kfree(vp->header_rxbuffer);
+ kfree(vp->header_txbuffer);
+ if (vp->rx_queue != NULL)
+ destroy_queue(vp->rx_queue);
+ if (vp->tx_queue != NULL)
+ destroy_queue(vp->tx_queue);
+ kfree(vp->fds);
+ vp->fds = NULL;
+ spin_lock_irqsave(&vp->lock, flags);
+ vp->opened = false;
+ vp->in_error = false;
+ spin_unlock_irqrestore(&vp->lock, flags);
+ return 0;
+}
+
+static int vector_poll(struct napi_struct *napi, int budget)
+{
+ struct vector_private *vp = container_of(napi, struct vector_private, napi);
+ int work_done = 0;
+ int err;
+ bool tx_enqueued = false;
+
+ if ((vp->options & VECTOR_TX) != 0)
+ tx_enqueued = (vector_send(vp->tx_queue) > 0);
+ if ((vp->options & VECTOR_RX) > 0)
+ err = vector_mmsg_rx(vp, budget);
+ else {
+ err = vector_legacy_rx(vp);
+ if (err > 0)
+ err = 1;
+ }
+ if (err > 0)
+ work_done += err;
+
+ if (tx_enqueued || err > 0)
+ napi_schedule(napi);
+ if (work_done < budget)
+ napi_complete_done(napi, work_done);
+ return work_done;
+}
+
+static void vector_reset_tx(struct work_struct *work)
+{
+ struct vector_private *vp =
+ container_of(work, struct vector_private, reset_tx);
+ netdev_reset_queue(vp->dev);
+ netif_start_queue(vp->dev);
+ netif_wake_queue(vp->dev);
+}
+
+static int vector_net_open(struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ unsigned long flags;
+ int err = -EINVAL;
+ struct vector_device *vdevice;
+
+ spin_lock_irqsave(&vp->lock, flags);
+ if (vp->opened) {
+ spin_unlock_irqrestore(&vp->lock, flags);
+ return -ENXIO;
+ }
+ vp->opened = true;
+ spin_unlock_irqrestore(&vp->lock, flags);
+
+ vp->bpf = uml_vector_user_bpf(get_bpf_file(vp->parsed));
+
+ vp->fds = uml_vector_user_open(vp->unit, vp->parsed);
+
+ if (vp->fds == NULL)
+ goto out_close;
+
+ if (build_transport_data(vp) < 0)
+ goto out_close;
+
+ if ((vp->options & VECTOR_RX) > 0) {
+ vp->rx_queue = create_queue(
+ vp,
+ get_depth(vp->parsed),
+ vp->rx_header_size,
+ MAX_IOV_SIZE
+ );
+ vp->rx_queue->queue_depth = get_depth(vp->parsed);
+ } else {
+ vp->header_rxbuffer = kmalloc(
+ vp->rx_header_size,
+ GFP_KERNEL
+ );
+ if (vp->header_rxbuffer == NULL)
+ goto out_close;
+ }
+ if ((vp->options & VECTOR_TX) > 0) {
+ vp->tx_queue = create_queue(
+ vp,
+ get_depth(vp->parsed),
+ vp->header_size,
+ MAX_IOV_SIZE
+ );
+ } else {
+ vp->header_txbuffer = kmalloc(vp->header_size, GFP_KERNEL);
+ if (vp->header_txbuffer == NULL)
+ goto out_close;
+ }
+
+ netif_napi_add_weight(vp->dev, &vp->napi, vector_poll,
+ get_depth(vp->parsed));
+ napi_enable(&vp->napi);
+
+ /* READ IRQ */
+ err = um_request_irq(
+ irq_rr + VECTOR_BASE_IRQ, vp->fds->rx_fd,
+ IRQ_READ, vector_rx_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (err < 0) {
+ netdev_err(dev, "vector_open: failed to get rx irq(%d)\n", err);
+ err = -ENETUNREACH;
+ goto out_close;
+ }
+ vp->rx_irq = irq_rr + VECTOR_BASE_IRQ;
+ dev->irq = irq_rr + VECTOR_BASE_IRQ;
+ irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
+
+ /* WRITE IRQ - we need it only if we have vector TX */
+ if ((vp->options & VECTOR_TX) > 0) {
+ err = um_request_irq(
+ irq_rr + VECTOR_BASE_IRQ, vp->fds->tx_fd,
+ IRQ_WRITE, vector_tx_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (err < 0) {
+ netdev_err(dev,
+ "vector_open: failed to get tx irq(%d)\n", err);
+ err = -ENETUNREACH;
+ goto out_close;
+ }
+ vp->tx_irq = irq_rr + VECTOR_BASE_IRQ;
+ irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
+ }
+
+ if ((vp->options & VECTOR_QDISC_BYPASS) != 0) {
+ if (!uml_raw_enable_qdisc_bypass(vp->fds->rx_fd))
+ vp->options |= VECTOR_BPF;
+ }
+ if (((vp->options & VECTOR_BPF) != 0) && (vp->bpf == NULL))
+ vp->bpf = uml_vector_default_bpf(dev->dev_addr);
+
+ if (vp->bpf != NULL)
+ uml_vector_attach_bpf(vp->fds->rx_fd, vp->bpf);
+
+ netif_start_queue(dev);
+ vector_reset_stats(vp);
+
+ /* clear buffer - it can happen that the host side of the interface
+ * is full when we get here. In this case, new data is never queued,
+ * SIGIOs never arrive, and the net never works.
+ */
+
+ napi_schedule(&vp->napi);
+
+ vdevice = find_device(vp->unit);
+ vdevice->opened = 1;
+
+ if ((vp->options & VECTOR_TX) != 0)
+ add_timer(&vp->tl);
+ return 0;
+out_close:
+ vector_net_close(dev);
+ return err;
+}
+
+
+static void vector_net_set_multicast_list(struct net_device *dev)
+{
+ /* TODO: - we can do some BPF games here */
+ return;
+}
+
+static void vector_net_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+ struct vector_private *vp = netdev_priv(dev);
+
+ vp->estats.tx_timeout_count++;
+ netif_trans_update(dev);
+ schedule_work(&vp->reset_tx);
+}
+
+static netdev_features_t vector_fix_features(struct net_device *dev,
+ netdev_features_t features)
+{
+ features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
+ return features;
+}
+
+static int vector_set_features(struct net_device *dev,
+ netdev_features_t features)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ /* Adjust buffer sizes for GSO/GRO. Unfortunately, there is
+ * no way to negotiate it on raw sockets, so we can change
+ * only our side.
+ */
+ if (features & NETIF_F_GRO)
+ /* All new frame buffers will be GRO-sized */
+ vp->req_size = 65536;
+ else
+ /* All new frame buffers will be normal sized */
+ vp->req_size = vp->max_packet + vp->headroom + SAFETY_MARGIN;
+ return 0;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void vector_net_poll_controller(struct net_device *dev)
+{
+ disable_irq(dev->irq);
+ vector_rx_interrupt(dev->irq, dev);
+ enable_irq(dev->irq);
+}
+#endif
+
+static void vector_net_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strscpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+}
+
+static int vector_net_load_bpf_flash(struct net_device *dev,
+ struct ethtool_flash *efl)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ struct vector_device *vdevice;
+ const struct firmware *fw;
+ int result = 0;
+
+ if (!(vp->options & VECTOR_BPF_FLASH)) {
+ netdev_err(dev, "loading firmware not permitted: %s\n", efl->data);
+ return -1;
+ }
+
+ spin_lock(&vp->lock);
+
+ if (vp->bpf != NULL) {
+ if (vp->opened)
+ uml_vector_detach_bpf(vp->fds->rx_fd, vp->bpf);
+ kfree(vp->bpf->filter);
+ vp->bpf->filter = NULL;
+ } else {
+ vp->bpf = kmalloc(sizeof(struct sock_fprog), GFP_ATOMIC);
+ if (vp->bpf == NULL) {
+ netdev_err(dev, "failed to allocate memory for firmware\n");
+ goto flash_fail;
+ }
+ }
+
+ vdevice = find_device(vp->unit);
+
+ if (request_firmware(&fw, efl->data, &vdevice->pdev.dev))
+ goto flash_fail;
+
+ vp->bpf->filter = kmemdup(fw->data, fw->size, GFP_ATOMIC);
+ if (!vp->bpf->filter)
+ goto free_buffer;
+
+ vp->bpf->len = fw->size / sizeof(struct sock_filter);
+ release_firmware(fw);
+
+ if (vp->opened)
+ result = uml_vector_attach_bpf(vp->fds->rx_fd, vp->bpf);
+
+ spin_unlock(&vp->lock);
+
+ return result;
+
+free_buffer:
+ release_firmware(fw);
+
+flash_fail:
+ spin_unlock(&vp->lock);
+ if (vp->bpf != NULL)
+ kfree(vp->bpf->filter);
+ kfree(vp->bpf);
+ vp->bpf = NULL;
+ return -1;
+}
+
+static void vector_get_ringparam(struct net_device *netdev,
+ struct ethtool_ringparam *ring,
+ struct kernel_ethtool_ringparam *kernel_ring,
+ struct netlink_ext_ack *extack)
+{
+ struct vector_private *vp = netdev_priv(netdev);
+
+ ring->rx_max_pending = vp->rx_queue->max_depth;
+ ring->tx_max_pending = vp->tx_queue->max_depth;
+ ring->rx_pending = vp->rx_queue->max_depth;
+ ring->tx_pending = vp->tx_queue->max_depth;
+}
+
+static void vector_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
+{
+ switch (stringset) {
+ case ETH_SS_TEST:
+ *buf = '\0';
+ break;
+ case ETH_SS_STATS:
+ memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+}
+
+static int vector_get_sset_count(struct net_device *dev, int sset)
+{
+ switch (sset) {
+ case ETH_SS_TEST:
+ return 0;
+ case ETH_SS_STATS:
+ return VECTOR_NUM_STATS;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static void vector_get_ethtool_stats(struct net_device *dev,
+ struct ethtool_stats *estats,
+ u64 *tmp_stats)
+{
+ struct vector_private *vp = netdev_priv(dev);
+
+ memcpy(tmp_stats, &vp->estats, sizeof(struct vector_estats));
+}
+
+static int vector_get_coalesce(struct net_device *netdev,
+ struct ethtool_coalesce *ec,
+ struct kernel_ethtool_coalesce *kernel_coal,
+ struct netlink_ext_ack *extack)
+{
+ struct vector_private *vp = netdev_priv(netdev);
+
+ ec->tx_coalesce_usecs = (vp->coalesce * 1000000) / HZ;
+ return 0;
+}
+
+static int vector_set_coalesce(struct net_device *netdev,
+ struct ethtool_coalesce *ec,
+ struct kernel_ethtool_coalesce *kernel_coal,
+ struct netlink_ext_ack *extack)
+{
+ struct vector_private *vp = netdev_priv(netdev);
+
+ vp->coalesce = (ec->tx_coalesce_usecs * HZ) / 1000000;
+ if (vp->coalesce == 0)
+ vp->coalesce = 1;
+ return 0;
+}
+
+static const struct ethtool_ops vector_net_ethtool_ops = {
+ .supported_coalesce_params = ETHTOOL_COALESCE_TX_USECS,
+ .get_drvinfo = vector_net_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_ts_info = ethtool_op_get_ts_info,
+ .get_ringparam = vector_get_ringparam,
+ .get_strings = vector_get_strings,
+ .get_sset_count = vector_get_sset_count,
+ .get_ethtool_stats = vector_get_ethtool_stats,
+ .get_coalesce = vector_get_coalesce,
+ .set_coalesce = vector_set_coalesce,
+ .flash_device = vector_net_load_bpf_flash,
+};
+
+
+static const struct net_device_ops vector_netdev_ops = {
+ .ndo_open = vector_net_open,
+ .ndo_stop = vector_net_close,
+ .ndo_start_xmit = vector_net_start_xmit,
+ .ndo_set_rx_mode = vector_net_set_multicast_list,
+ .ndo_tx_timeout = vector_net_tx_timeout,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_fix_features = vector_fix_features,
+ .ndo_set_features = vector_set_features,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = vector_net_poll_controller,
+#endif
+};
+
+static void vector_timer_expire(struct timer_list *t)
+{
+ struct vector_private *vp = from_timer(vp, t, tl);
+
+ vp->estats.tx_kicks++;
+ napi_schedule(&vp->napi);
+}
+
+
+
+static void vector_eth_configure(
+ int n,
+ struct arglist *def
+ )
+{
+ struct vector_device *device;
+ struct net_device *dev;
+ struct vector_private *vp;
+ int err;
+
+ device = kzalloc(sizeof(*device), GFP_KERNEL);
+ if (device == NULL) {
+ printk(KERN_ERR "eth_configure failed to allocate struct "
+ "vector_device\n");
+ return;
+ }
+ dev = alloc_etherdev(sizeof(struct vector_private));
+ if (dev == NULL) {
+ printk(KERN_ERR "eth_configure: failed to allocate struct "
+ "net_device for vec%d\n", n);
+ goto out_free_device;
+ }
+
+ dev->mtu = get_mtu(def);
+
+ INIT_LIST_HEAD(&device->list);
+ device->unit = n;
+
+ /* If this name ends up conflicting with an existing registered
+ * netdevice, that is OK, register_netdev{,ice}() will notice this
+ * and fail.
+ */
+ snprintf(dev->name, sizeof(dev->name), "vec%d", n);
+ uml_net_setup_etheraddr(dev, uml_vector_fetch_arg(def, "mac"));
+ vp = netdev_priv(dev);
+
+ /* sysfs register */
+ if (!driver_registered) {
+ platform_driver_register(&uml_net_driver);
+ driver_registered = 1;
+ }
+ device->pdev.id = n;
+ device->pdev.name = DRIVER_NAME;
+ device->pdev.dev.release = vector_device_release;
+ dev_set_drvdata(&device->pdev.dev, device);
+ if (platform_device_register(&device->pdev))
+ goto out_free_netdev;
+ SET_NETDEV_DEV(dev, &device->pdev.dev);
+
+ device->dev = dev;
+
+ *vp = ((struct vector_private)
+ {
+ .list = LIST_HEAD_INIT(vp->list),
+ .dev = dev,
+ .unit = n,
+ .options = get_transport_options(def),
+ .rx_irq = 0,
+ .tx_irq = 0,
+ .parsed = def,
+ .max_packet = get_mtu(def) + ETH_HEADER_OTHER,
+ /* TODO - we need to calculate headroom so that ip header
+ * is 16 byte aligned all the time
+ */
+ .headroom = get_headroom(def),
+ .form_header = NULL,
+ .verify_header = NULL,
+ .header_rxbuffer = NULL,
+ .header_txbuffer = NULL,
+ .header_size = 0,
+ .rx_header_size = 0,
+ .rexmit_scheduled = false,
+ .opened = false,
+ .transport_data = NULL,
+ .in_write_poll = false,
+ .coalesce = 2,
+ .req_size = get_req_size(def),
+ .in_error = false,
+ .bpf = NULL
+ });
+
+ dev->features = dev->hw_features = (NETIF_F_SG | NETIF_F_FRAGLIST);
+ INIT_WORK(&vp->reset_tx, vector_reset_tx);
+
+ timer_setup(&vp->tl, vector_timer_expire, 0);
+ spin_lock_init(&vp->lock);
+
+ /* FIXME */
+ dev->netdev_ops = &vector_netdev_ops;
+ dev->ethtool_ops = &vector_net_ethtool_ops;
+ dev->watchdog_timeo = (HZ >> 1);
+ /* primary IRQ - fixme */
+ dev->irq = 0; /* we will adjust this once opened */
+
+ rtnl_lock();
+ err = register_netdevice(dev);
+ rtnl_unlock();
+ if (err)
+ goto out_undo_user_init;
+
+ spin_lock(&vector_devices_lock);
+ list_add(&device->list, &vector_devices);
+ spin_unlock(&vector_devices_lock);
+
+ return;
+
+out_undo_user_init:
+ return;
+out_free_netdev:
+ free_netdev(dev);
+out_free_device:
+ kfree(device);
+}
+
+
+
+
+/*
+ * Invoked late in the init
+ */
+
+static int __init vector_init(void)
+{
+ struct list_head *ele;
+ struct vector_cmd_line_arg *def;
+ struct arglist *parsed;
+
+ list_for_each(ele, &vec_cmd_line) {
+ def = list_entry(ele, struct vector_cmd_line_arg, list);
+ parsed = uml_parse_vector_ifspec(def->arguments);
+ if (parsed != NULL)
+ vector_eth_configure(def->unit, parsed);
+ }
+ return 0;
+}
+
+
+/* Invoked at initial argument parsing, only stores
+ * arguments until a proper vector_init is called
+ * later
+ */
+
+static int __init vector_setup(char *str)
+{
+ char *error;
+ int n, err;
+ struct vector_cmd_line_arg *new;
+
+ err = vector_parse(str, &n, &str, &error);
+ if (err) {
+ printk(KERN_ERR "vector_setup - Couldn't parse '%s' : %s\n",
+ str, error);
+ return 1;
+ }
+ new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
+ if (!new)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ sizeof(*new));
+ INIT_LIST_HEAD(&new->list);
+ new->unit = n;
+ new->arguments = str;
+ list_add_tail(&new->list, &vec_cmd_line);
+ return 1;
+}
+
+__setup("vec", vector_setup);
+__uml_help(vector_setup,
+"vec[0-9]+:<option>=<value>,<option>=<value>\n"
+" Configure a vector io network device.\n\n"
+);
+
+late_initcall(vector_init);
+
+static struct mc_device vector_mc = {
+ .list = LIST_HEAD_INIT(vector_mc.list),
+ .name = "vec",
+ .config = vector_config,
+ .get_config = NULL,
+ .id = vector_id,
+ .remove = vector_remove,
+};
+
+#ifdef CONFIG_INET
+static int vector_inetaddr_event(
+ struct notifier_block *this,
+ unsigned long event,
+ void *ptr)
+{
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block vector_inetaddr_notifier = {
+ .notifier_call = vector_inetaddr_event,
+};
+
+static void inet_register(void)
+{
+ register_inetaddr_notifier(&vector_inetaddr_notifier);
+}
+#else
+static inline void inet_register(void)
+{
+}
+#endif
+
+static int vector_net_init(void)
+{
+ mconsole_register_dev(&vector_mc);
+ inet_register();
+ return 0;
+}
+
+__initcall(vector_net_init);
+
+
+