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965a990984
Here, the bind syscall is added. Binding an AF_XDP socket, means
associating the socket to an umem, a netdev and a queue index. This
can be done in two ways.
The first way, creating a "socket from scratch". Create the umem using
the XDP_UMEM_REG setsockopt and an associated fill queue with
XDP_UMEM_FILL_QUEUE. Create the Rx queue using the XDP_RX_QUEUE
setsockopt. Call bind passing ifindex and queue index ("channel" in
ethtool speak).
The second way to bind a socket, is simply skipping the
umem/netdev/queue index, and passing another already setup AF_XDP
socket. The new socket will then have the same umem/netdev/queue index
as the parent so it will share the same umem. You must also set the
flags field in the socket address to XDP_SHARED_UMEM.
v2: Use PTR_ERR instead of passing error variable explicitly.
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* XDP user-space ring structure
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* Copyright(c) 2018 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/slab.h>
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#include "xsk_queue.h"
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void xskq_set_umem(struct xsk_queue *q, struct xdp_umem_props *umem_props)
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{
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if (!q)
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return;
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q->umem_props = *umem_props;
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}
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static u32 xskq_umem_get_ring_size(struct xsk_queue *q)
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{
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return sizeof(struct xdp_umem_ring) + q->nentries * sizeof(u32);
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}
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static u32 xskq_rxtx_get_ring_size(struct xsk_queue *q)
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{
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return (sizeof(struct xdp_ring) +
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q->nentries * sizeof(struct xdp_desc));
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}
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struct xsk_queue *xskq_create(u32 nentries, bool umem_queue)
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{
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struct xsk_queue *q;
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gfp_t gfp_flags;
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size_t size;
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q = kzalloc(sizeof(*q), GFP_KERNEL);
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if (!q)
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return NULL;
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q->nentries = nentries;
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q->ring_mask = nentries - 1;
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gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN |
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__GFP_COMP | __GFP_NORETRY;
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size = umem_queue ? xskq_umem_get_ring_size(q) :
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xskq_rxtx_get_ring_size(q);
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q->ring = (struct xdp_ring *)__get_free_pages(gfp_flags,
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get_order(size));
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if (!q->ring) {
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kfree(q);
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return NULL;
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}
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return q;
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}
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void xskq_destroy(struct xsk_queue *q)
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{
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if (!q)
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return;
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page_frag_free(q->ring);
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kfree(q);
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}
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