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packet: Fixed TPACKET V3 to signal poll when block is closed rather than every packet 

Make TPACKET_V3 signal poll when block is closed rather than for every
packet. Side effect is that poll will be signaled when block retire
timer expires which didn't previously happen. Issue was visible when
sending packets at a very low frequency such that all blocks are retired
before packets are received by TPACKET_V3. This caused avoidable packet
loss. The fix ensures that the signal is sent when blocks are closed
which covers the normal path where the block is filled as well as the
path where the timer expires. The case where a block is filled without
moving to the next block (ie. all blocks are full) will still cause poll
to be signaled.

Signed-off-by: Dan Collins <dan@dcollins.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Collins 2014-12-19 16:49:25 +13:00 committed by David S. Miller
parent 02d6a746c3
commit da413eec72
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
net/packet/af_packet.c
View File

@ -785,6 +785,7 @@ static void prb_close_block(struct tpacket_kbdq_core *pkc1,
struct tpacket3_hdr *last_pkt; struct tpacket3_hdr *last_pkt;
struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
struct sock *sk = &po->sk;
if (po->stats.stats3.tp_drops) if (po->stats.stats3.tp_drops)
status |= TP_STATUS_LOSING; status |= TP_STATUS_LOSING;
@ -809,6 +810,8 @@ static void prb_close_block(struct tpacket_kbdq_core *pkc1,
/* Flush the block */ /* Flush the block */
prb_flush_block(pkc1, pbd1, status); prb_flush_block(pkc1, pbd1, status);
sk->sk_data_ready(sk);
pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1); pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
} }
@ -2052,12 +2055,12 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
smp_wmb(); smp_wmb();
#endif #endif
if (po->tp_version <= TPACKET_V2) if (po->tp_version <= TPACKET_V2) {
__packet_set_status(po, h.raw, status); __packet_set_status(po, h.raw, status);
else
prb_clear_blk_fill_status(&po->rx_ring);
sk->sk_data_ready(sk); sk->sk_data_ready(sk);
} else {
prb_clear_blk_fill_status(&po->rx_ring);
}
drop_n_restore: drop_n_restore:
if (skb_head != skb->data && skb_shared(skb)) { if (skb_head != skb->data && skb_shared(skb)) {