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Commit 8d86c61a authored by Santiago Leon's avatar Santiago Leon Committed by David S. Miller
Browse files

ibmveth: Add rx_copybreak



For small packets, create a new skb and copy the packet into it so we
avoid tearing down and creating a TCE entry.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarSantiago Leon <santil@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c08cc3cc
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+23 −6
Original line number Diff line number Diff line
@@ -122,6 +122,11 @@ module_param(tx_copybreak, uint, 0644);
MODULE_PARM_DESC(tx_copybreak,
	"Maximum size of packet that is copied to a new buffer on transmit");

static unsigned int rx_copybreak __read_mostly = 128;
module_param(rx_copybreak, uint, 0644);
MODULE_PARM_DESC(rx_copybreak,
	"Maximum size of packet that is copied to a new buffer on receive");

struct ibmveth_stat {
	char name[ETH_GSTRING_LEN];
	int offset;
@@ -1002,8 +1007,6 @@ static int ibmveth_poll(struct napi_struct *napi, int budget)

 restart_poll:
	do {
		struct sk_buff *skb;

		if (!ibmveth_rxq_pending_buffer(adapter))
			break;

@@ -1014,20 +1017,34 @@ static int ibmveth_poll(struct napi_struct *napi, int budget)
			ibmveth_debug_printk("recycling invalid buffer\n");
			ibmveth_rxq_recycle_buffer(adapter);
		} else {
			struct sk_buff *skb, *new_skb;
			int length = ibmveth_rxq_frame_length(adapter);
			int offset = ibmveth_rxq_frame_offset(adapter);
			int csum_good = ibmveth_rxq_csum_good(adapter);

			skb = ibmveth_rxq_get_buffer(adapter);
			if (csum_good)
				skb->ip_summed = CHECKSUM_UNNECESSARY;

			ibmveth_rxq_harvest_buffer(adapter);
			new_skb = NULL;
			if (length < rx_copybreak)
				new_skb = netdev_alloc_skb(netdev, length);

			if (new_skb) {
				skb_copy_to_linear_data(new_skb,
							skb->data + offset,
							length);
				skb = new_skb;
				ibmveth_rxq_recycle_buffer(adapter);
			} else {
				ibmveth_rxq_harvest_buffer(adapter);
				skb_reserve(skb, offset);
			}

			skb_put(skb, length);
			skb->protocol = eth_type_trans(skb, netdev);

			if (csum_good)
				skb->ip_summed = CHECKSUM_UNNECESSARY;

			netif_receive_skb(skb);	/* send it up */

			netdev->stats.rx_packets++;