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xsk: add Rx queue setup and mmap support

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Another setsockopt (XDP_RX_QUEUE) is added to let the process allocate
a queue, where the kernel can pass completed Rx frames from the kernel
to user process.

The mmapping of the queue is done using the XDP_PGOFF_RX_QUEUE offset.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Björn Töpel
2018-05-02 13:01:25 +02:00
committed by Alexei Starovoitov
parent 423f38329d
commit b9b6b68e8a
5 changed files with 62 additions and 12 deletions
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11
net/xdp/xsk_queue.c
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@@ -21,7 +21,13 @@ static u32 xskq_umem_get_ring_size(struct xsk_queue *q)
return sizeof(struct xdp_umem_ring) + q->nentries * sizeof(u32);
}
struct xsk_queue *xskq_create(u32 nentries)
static u32 xskq_rxtx_get_ring_size(struct xsk_queue *q)
{
return (sizeof(struct xdp_ring) +
q->nentries * sizeof(struct xdp_desc));
}
struct xsk_queue *xskq_create(u32 nentries, bool umem_queue)
{
struct xsk_queue *q;
gfp_t gfp_flags;
@@ -36,7 +42,8 @@ struct xsk_queue *xskq_create(u32 nentries)
gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN |
__GFP_COMP | __GFP_NORETRY;
size = xskq_umem_get_ring_size(q);
size = umem_queue ? xskq_umem_get_ring_size(q) :
xskq_rxtx_get_ring_size(q);
q->ring = (struct xdp_ring *)__get_free_pages(gfp_flags,
get_order(size));