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Simplify TX datapath.

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This commit is contained in:
Michael Brown
2006-06-16 00:19:46 +00:00
parent cce2e47ff4
commit bbd9e28061
9 changed files with 279 additions and 456 deletions
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92
src/net/ethernet.c
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@@ -25,7 +25,6 @@
#include <gpxe/if_ether.h>
#include <gpxe/netdevice.h>
#include <gpxe/pkbuff.h>
#include <gpxe/arp.h>
#include <gpxe/ethernet.h>
/** @file
@@ -38,70 +37,24 @@
static uint8_t eth_broadcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
/**
* Perform Ethernet routing
* Transmit Ethernet packet
*
* @v nethdr Generic network-layer header
* @ret llhdr Generic link-layer header
* @ret rc Return status code
* @v pkb Packet buffer
* @v netdev Network device
* @v net_protocol Network-layer protocol
* @v ll_dest Link-layer destination address
*
* Constructs the generic link-layer header based on the generic
* network-layer header, i.e. maps network-layer addresses (e.g. IPv4
* addresses) to MAC addresses.
*
* If the destination MAC address cannot be determined, an ARP request
* is sent for the requested network-layer address and -ENOENT is
* returned.
* Prepends the Ethernet link-layer header and transmits the packet.
*/
static int eth_route ( struct net_device *netdev,
const struct net_header *nethdr,
struct ll_header *llhdr ) {
int rc;
static int eth_transmit ( struct pk_buff *pkb, struct net_device *netdev,
struct net_protocol *net_protocol,
const void *ll_dest ) {
struct ethhdr *ethhdr = pkb_push ( pkb, ETH_HLEN );
/* Fill in the easy bits */
llhdr->net_proto = nethdr->net_protocol->net_proto;
memcpy ( llhdr->source_ll_addr, netdev->ll_addr, ETH_ALEN );
/* Work out the destination MAC address */
if ( nethdr->flags & PKT_FL_BROADCAST ) {
memcpy ( llhdr->dest_ll_addr, eth_broadcast, ETH_ALEN );
} else if ( nethdr->flags & PKT_FL_RAW_ADDR ) {
memcpy ( llhdr->dest_ll_addr, nethdr->dest_net_addr, ETH_ALEN);
} else if ( nethdr->flags & PKT_FL_MULTICAST ) {
/* IP multicast is a special case; there exists a
* direct mapping from IP address to MAC address
*/
assert ( nethdr->net_protocol->net_proto == htons(ETH_P_IP) );
llhdr->dest_ll_addr[0] = 0x01;
llhdr->dest_ll_addr[1] = 0x00;
llhdr->dest_ll_addr[2] = 0x5e;
llhdr->dest_ll_addr[3] = nethdr->dest_net_addr[1] & 0x7f;
llhdr->dest_ll_addr[4] = nethdr->dest_net_addr[2];
llhdr->dest_ll_addr[5] = nethdr->dest_net_addr[3];
} else {
/* Otherwise, look up the address using ARP */
if ( ( rc = arp_resolve ( netdev, nethdr, llhdr ) ) != 0 )
return rc;
}
return 0;
}
/**
* Fill in Ethernet link-layer header
*
* @v pkb Packet buffer
* @v llhdr Generic link-layer header
*
* Fills in the Ethernet link-layer header in the packet buffer based
* on information in the generic link-layer header.
*/
static void eth_fill_llh ( const struct ll_header *llhdr,
struct pk_buff *pkb ) {
struct ethhdr *ethhdr = pkb->data;
memcpy ( ethhdr->h_dest, llhdr->dest_ll_addr, ETH_ALEN );
memcpy ( ethhdr->h_source, llhdr->source_ll_addr, ETH_ALEN );
ethhdr->h_protocol = llhdr->net_proto;
memcpy ( ethhdr->h_dest, ll_dest, ETH_ALEN );
memcpy ( ethhdr->h_source, netdev->ll_addr, ETH_ALEN );
ethhdr->h_protocol = net_protocol->net_proto;
return netdev_transmit ( netdev, pkb );
}
/**
@@ -138,7 +91,7 @@ static void eth_parse_llh ( const struct pk_buff *pkb,
*/
static const char * eth_ntoa ( const void *ll_addr ) {
static char buf[18]; /* "00:00:00:00:00:00" */
uint8_t *eth_addr = ll_addr;
const uint8_t *eth_addr = ll_addr;
sprintf ( buf, "%02x:%02x:%02x:%02x:%02x:%02x",
eth_addr[0], eth_addr[1], eth_addr[2],
@@ -148,14 +101,13 @@ static const char * eth_ntoa ( const void *ll_addr ) {
/** Ethernet protocol */
struct ll_protocol ethernet_protocol = {
.name = "Ethernet",
.ll_proto = htons ( ARPHRD_ETHER ),
.ll_addr_len = ETH_ALEN,
.ll_header_len = ETH_HLEN,
.route = eth_route,
.fill_llh = eth_fill_llh,
.parse_llh = eth_parse_llh,
.ntoa = eth_ntoa,
.name = "Ethernet",
.ll_proto = htons ( ARPHRD_ETHER ),
.ll_addr_len = ETH_ALEN,
.ll_broadcast = eth_broadcast,
.transmit = eth_transmit,
.parse_llh = eth_parse_llh,
.ntoa = eth_ntoa,
};
LL_PROTOCOL ( ethernet_protocol );