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xen/pvcalls: implement write

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When the other end notifies us that there is data to be written
(pvcalls_back_conn_event), increment the io and write counters, and
schedule the ioworker.

Implement the write function called by ioworker by reading the data from
the data ring, writing it to the socket by calling inet_sendmsg.

Set out_error on error.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Stefano Stabellini 2017-07-06 11:01:08 -07:00 committed by Boris Ostrovsky
parent b3f9f773af
commit 5ad9918ffc
1 changed files with 71 additions and 0 deletions
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71
drivers/xen/pvcalls-back.c
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@ -177,6 +177,64 @@ static void pvcalls_conn_back_read(void *opaque)
static void pvcalls_conn_back_write(struct sock_mapping *map)
{
struct pvcalls_data_intf *intf = map->ring;
struct pvcalls_data *data = &map->data;
struct msghdr msg;
struct kvec vec[2];
RING_IDX cons, prod, size, array_size;
int ret;
cons = intf->out_cons;
prod = intf->out_prod;
/* read the indexes before dealing with the data */
virt_mb();
array_size = XEN_FLEX_RING_SIZE(map->ring_order);
size = pvcalls_queued(prod, cons, array_size);
if (size == 0)
return;
memset(&msg, 0, sizeof(msg));
msg.msg_flags |= MSG_DONTWAIT;
msg.msg_iter.type = ITER_KVEC|READ;
msg.msg_iter.count = size;
if (pvcalls_mask(prod, array_size) > pvcalls_mask(cons, array_size)) {
vec[0].iov_base = data->out + pvcalls_mask(cons, array_size);
vec[0].iov_len = size;
msg.msg_iter.kvec = vec;
msg.msg_iter.nr_segs = 1;
} else {
vec[0].iov_base = data->out + pvcalls_mask(cons, array_size);
vec[0].iov_len = array_size - pvcalls_mask(cons, array_size);
vec[1].iov_base = data->out;
vec[1].iov_len = size - vec[0].iov_len;
msg.msg_iter.kvec = vec;
msg.msg_iter.nr_segs = 2;
}
atomic_set(&map->write, 0);
ret = inet_sendmsg(map->sock, &msg, size);
if (ret == -EAGAIN || (ret >= 0 && ret < size)) {
atomic_inc(&map->write);
atomic_inc(&map->io);
}
if (ret == -EAGAIN)
return;
/* write the data, then update the indexes */
virt_wmb();
if (ret < 0) {
intf->out_error = ret;
} else {
intf->out_error = 0;
intf->out_cons = cons + ret;
prod = intf->out_prod;
}
/* update the indexes, then notify the other end */
virt_wmb();
if (prod != cons + ret)
atomic_inc(&map->write);
notify_remote_via_irq(map->irq);
}
static void pvcalls_back_ioworker(struct work_struct *work)
@ -847,6 +905,19 @@ static irqreturn_t pvcalls_back_event(int irq, void *dev_id)
static irqreturn_t pvcalls_back_conn_event(int irq, void *sock_map)
{
struct sock_mapping *map = sock_map;
struct pvcalls_ioworker *iow;
if (map == NULL || map->sock == NULL || map->sock->sk == NULL ||
map->sock->sk->sk_user_data != map)
return IRQ_HANDLED;
iow = &map->ioworker;
atomic_inc(&map->write);
atomic_inc(&map->io);
queue_work(iow->wq, &iow->register_work);
return IRQ_HANDLED;
}