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enic: Feature Add: Replace LRO with GRO 

enic now uses the GRO mechanism instead of LRO to pass skbs to upper
layers.

Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vasanthy Kolluri 2010-06-24 10:49:25 +00:00 committed by David S. Miller
parent 72b8a169db
commit 88132f55d7
3 changed files with 9 additions and 80 deletions
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1
drivers/net/Kconfig
View File

@ -2615,7 +2615,6 @@ config EHEA
config ENIC
tristate "Cisco VIC Ethernet NIC Support"
depends on PCI && INET
select INET_LRO
help
This enables the support for the Cisco VIC Ethernet card.

9
drivers/net/enic/enic.h
View File

@ -20,8 +20,6 @@
#ifndef _ENIC_H_
#define _ENIC_H_
#include <linux/inet_lro.h>
#include "vnic_enet.h"
#include "vnic_dev.h"
#include "vnic_wq.h"
@ -34,13 +32,10 @@
#define DRV_NAME "enic"
#define DRV_DESCRIPTION "Cisco VIC Ethernet NIC Driver"
#define DRV_VERSION "1.3.1.1-pp"
#define DRV_VERSION "1.4.1.1"
#define DRV_COPYRIGHT "Copyright 2008-2009 Cisco Systems, Inc"
#define PFX DRV_NAME ": "
#define ENIC_LRO_MAX_DESC 8
#define ENIC_LRO_MAX_AGGR 64
#define ENIC_BARS_MAX 6
#define ENIC_WQ_MAX 8
@ -124,8 +119,6 @@ struct enic {
u64 rq_truncated_pkts;
u64 rq_bad_fcs;
struct napi_struct napi;
struct net_lro_mgr lro_mgr;
struct net_lro_desc lro_desc[ENIC_LRO_MAX_DESC];
/* interrupt resource cache line section */
____cacheline_aligned struct vnic_intr intr[ENIC_INTR_MAX];

79
drivers/net/enic/enic_main.c
View File

@ -1287,51 +1287,6 @@ static int enic_set_rq_alloc_buf(struct enic *enic)
return 0;
}
static int enic_get_skb_header(struct sk_buff *skb, void **iphdr,
void **tcph, u64 *hdr_flags, void *priv)
{
struct cq_enet_rq_desc *cq_desc = priv;
unsigned int ip_len;
struct iphdr *iph;
u8 type, color, eop, sop, ingress_port, vlan_stripped;
u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
u8 packet_error;
u16 q_number, completed_index, bytes_written, vlan, checksum;
u32 rss_hash;
cq_enet_rq_desc_dec(cq_desc,
&type, &color, &q_number, &completed_index,
&ingress_port, &fcoe, &eop, &sop, &rss_type,
&csum_not_calc, &rss_hash, &bytes_written,
&packet_error, &vlan_stripped, &vlan, &checksum,
&fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
&fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
&ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
&fcs_ok);
if (!(ipv4 && tcp && !ipv4_fragment))
return -1;
skb_reset_network_header(skb);
iph = ip_hdr(skb);
ip_len = ip_hdrlen(skb);
skb_set_transport_header(skb, ip_len);
/* check if ip header and tcp header are complete */
if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
return -1;
*hdr_flags = LRO_IPV4 | LRO_TCP;
*tcph = tcp_hdr(skb);
*iphdr = iph;
return 0;
}
static void enic_rq_indicate_buf(struct vnic_rq *rq,
struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
int skipped, void *opaque)
@ -1397,18 +1352,17 @@ static void enic_rq_indicate_buf(struct vnic_rq *rq,
if (enic->vlan_group && vlan_stripped) {
if ((netdev->features & NETIF_F_LRO) && ipv4)
lro_vlan_hwaccel_receive_skb(&enic->lro_mgr,
skb, enic->vlan_group,
vlan, cq_desc);
if (netdev->features & NETIF_F_GRO)
vlan_gro_receive(&enic->napi, enic->vlan_group,
vlan, skb);
else
vlan_hwaccel_receive_skb(skb,
enic->vlan_group, vlan);
} else {
if ((netdev->features & NETIF_F_LRO) && ipv4)
lro_receive_skb(&enic->lro_mgr, skb, cq_desc);
if (netdev->features & NETIF_F_GRO)
napi_gro_receive(&enic->napi, skb);
else
netif_receive_skb(skb);
@ -1438,7 +1392,6 @@ static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
static int enic_poll(struct napi_struct *napi, int budget)
{
struct enic *enic = container_of(napi, struct enic, napi);
struct net_device *netdev = enic->netdev;
unsigned int rq_work_to_do = budget;
unsigned int wq_work_to_do = -1; /* no limit */
unsigned int work_done, rq_work_done, wq_work_done;
@ -1478,12 +1431,9 @@ static int enic_poll(struct napi_struct *napi, int budget)
if (rq_work_done < rq_work_to_do) {
/* Some work done, but not enough to stay in polling,
* flush all LROs and exit polling
* exit polling
*/
if (netdev->features & NETIF_F_LRO)
lro_flush_all(&enic->lro_mgr);
napi_complete(napi);
vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
}
@ -1494,7 +1444,6 @@ static int enic_poll(struct napi_struct *napi, int budget)
static int enic_poll_msix(struct napi_struct *napi, int budget)
{
struct enic *enic = container_of(napi, struct enic, napi);
struct net_device *netdev = enic->netdev;
unsigned int work_to_do = budget;
unsigned int work_done;
int err;
@ -1528,12 +1477,9 @@ static int enic_poll_msix(struct napi_struct *napi, int budget)
if (work_done < work_to_do) {
/* Some work done, but not enough to stay in polling,
* flush all LROs and exit polling
* exit polling
*/
if (netdev->features & NETIF_F_LRO)
lro_flush_all(&enic->lro_mgr);
napi_complete(napi);
vnic_intr_unmask(&enic->intr[ENIC_MSIX_RQ]);
}
@ -2378,21 +2324,12 @@ static int __devinit enic_probe(struct pci_dev *pdev,
netdev->features |= NETIF_F_TSO |
NETIF_F_TSO6 | NETIF_F_TSO_ECN;
if (ENIC_SETTING(enic, LRO))
netdev->features |= NETIF_F_LRO;
netdev->features |= NETIF_F_GRO;
if (using_dac)
netdev->features |= NETIF_F_HIGHDMA;
enic->csum_rx_enabled = ENIC_SETTING(enic, RXCSUM);
enic->lro_mgr.max_aggr = ENIC_LRO_MAX_AGGR;
enic->lro_mgr.max_desc = ENIC_LRO_MAX_DESC;
enic->lro_mgr.lro_arr = enic->lro_desc;
enic->lro_mgr.get_skb_header = enic_get_skb_header;
enic->lro_mgr.features = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
enic->lro_mgr.dev = netdev;
enic->lro_mgr.ip_summed = CHECKSUM_COMPLETE;
enic->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
err = register_netdev(netdev);
if (err) {
printk(KERN_ERR PFX