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xsk: Use struct_size() helper
Improve readability and maintainability by using the struct_size() helper when allocating the AF_XDP rings. Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/1576759171-28550-13-git-send-email-magnus.karlsson@intel.com
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@ -18,14 +18,14 @@ void xskq_set_umem(struct xsk_queue *q, u64 size, u64 chunk_mask)
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q->chunk_mask = chunk_mask;
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}
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static u32 xskq_umem_get_ring_size(struct xsk_queue *q)
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static size_t xskq_get_ring_size(struct xsk_queue *q, bool umem_queue)
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{
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return sizeof(struct xdp_umem_ring) + q->nentries * sizeof(u64);
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}
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struct xdp_umem_ring *umem_ring;
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struct xdp_rxtx_ring *rxtx_ring;
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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) + q->nentries * sizeof(struct xdp_desc);
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if (umem_queue)
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return struct_size(umem_ring, desc, q->nentries);
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return struct_size(rxtx_ring, desc, q->nentries);
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}
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struct xsk_queue *xskq_create(u32 nentries, bool umem_queue)
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@ -43,8 +43,7 @@ struct xsk_queue *xskq_create(u32 nentries, bool umem_queue)
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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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size = xskq_get_ring_size(q, umem_queue);
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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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