Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

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

drivers/net/ibmveth.c

+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++;