Commit dcf70cef authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net/packet: constify prb_lookup_block() and __tpacket_v3_has_room() 



Goal is to be able to use __tpacket_v3_has_room() without holding
a lock.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d4b5bd98

net/packet/af_packet.c

+7 −7
Original line number Diff line number Diff line
@@ -1082,8 +1082,8 @@ static void *packet_current_rx_frame(struct packet_sock *po, 
	}

}



static void *prb_lookup_block(struct packet_sock *po,

				     struct packet_ring_buffer *rb,

static void *prb_lookup_block(const struct packet_sock *po,

			      const struct packet_ring_buffer *rb,

			      unsigned int idx,

			      int status)

{
@@ -1211,12 +1211,12 @@ static bool __tpacket_has_room(const struct packet_sock *po, int pow_off) 
	return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);

}



static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)

static bool __tpacket_v3_has_room(const struct packet_sock *po, int pow_off)

{

	int idx, len;



	len = po->rx_ring.prb_bdqc.knum_blocks;

	idx = po->rx_ring.prb_bdqc.kactive_blk_num;

	len = READ_ONCE(po->rx_ring.prb_bdqc.knum_blocks);

	idx = READ_ONCE(po->rx_ring.prb_bdqc.kactive_blk_num);

	if (pow_off)

		idx += len >> pow_off;

	if (idx >= len)