Have the MAC strip the ethernet FCS on rx so it is not included in the hardware
checksum and add code to support IPv4 TCP/UDP hardware checksums.
This commit is contained in:
heas
parent
d39b670320
commit
9bcc8b955c
167
sys/dev/ic/gem.c
167
sys/dev/ic/gem.c
@ -1,4 +1,4 @@
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/* $NetBSD: gem.c,v 1.34 2005/02/04 02:10:36 perry Exp $ */
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/* $NetBSD: gem.c,v 1.35 2005/02/20 18:29:00 heas Exp $ */
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/*
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*
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@ -34,8 +34,9 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: gem.c,v 1.34 2005/02/04 02:10:36 perry Exp $");
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__KERNEL_RCSID(0, "$NetBSD: gem.c,v 1.35 2005/02/20 18:29:00 heas Exp $");
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#include "opt_inet.h"
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#include "bpfilter.h"
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#include <sys/param.h>
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@ -59,6 +60,15 @@ __KERNEL_RCSID(0, "$NetBSD: gem.c,v 1.34 2005/02/04 02:10:36 perry Exp $");
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#include <net/if_media.h>
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#include <net/if_ether.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#endif
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#if NBPFILTER > 0
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#include <net/bpf.h>
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#endif
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@ -241,6 +251,8 @@ gem_attach(sc, enaddr)
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ifp->if_softc = sc;
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ifp->if_flags =
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IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST;
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ifp->if_capabilities |= IFCAP_CSUM_TCPv4_Rx | IFCAP_CSUM_UDPv4_Rx
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| IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4;
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ifp->if_start = gem_start;
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ifp->if_ioctl = gem_ioctl;
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ifp->if_watchdog = gem_watchdog;
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@ -831,11 +843,18 @@ gem_init(struct ifnet *ifp)
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/* Encode Receive Descriptor ring size: four possible values */
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v = gem_ringsize(GEM_NRXDESC /*XXX*/);
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/* Set receive h/w checksum offset */
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#ifdef INET
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v |= (ETHER_HDR_LEN + sizeof(struct ip) +
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((sc->sc_ethercom.ec_capenable & ETHERCAP_VLAN_MTU) ?
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ETHER_VLAN_ENCAP_LEN : 0)) << GEM_RX_CONFIG_CXM_START_SHFT;
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#endif
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/* Enable DMA */
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bus_space_write_4(t, h, GEM_RX_CONFIG,
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v|(GEM_THRSH_1024<<GEM_RX_CONFIG_FIFO_THRS_SHIFT)|
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(2<<GEM_RX_CONFIG_FBOFF_SHFT)|GEM_RX_CONFIG_RXDMA_EN|
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(0<<GEM_RX_CONFIG_CXM_START_SHFT));
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(2<<GEM_RX_CONFIG_FBOFF_SHFT)|GEM_RX_CONFIG_RXDMA_EN);
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/*
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* The following value is for an OFF Threshold of about 3/4 full
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* and an ON Threshold of 1/4 full.
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@ -853,7 +872,7 @@ gem_init(struct ifnet *ifp)
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/* step 12. RX_MAC Configuration Register */
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v = bus_space_read_4(t, h, GEM_MAC_RX_CONFIG);
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v |= GEM_MAC_RX_ENABLE;
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v |= GEM_MAC_RX_ENABLE | GEM_MAC_RX_STRIP_CRC;
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bus_space_write_4(t, h, GEM_MAC_RX_CONFIG, v);
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/* step 14. Issue Transmit Pending command */
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@ -1114,6 +1133,39 @@ gem_start(ifp)
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sc->sc_txwin = 0;
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flags |= GEM_TD_INTERRUPT_ME;
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}
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#ifdef INET
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/* h/w checksum */
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if (ifp->if_csum_flags_tx & (M_CSUM_TCPv4 |
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M_CSUM_UDPv4) && m0->m_pkthdr.csum_flags &
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(M_CSUM_TCPv4|M_CSUM_UDPv4)) {
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struct ether_header *eh;
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uint16_t offset, start;
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eh = mtod(m0, struct ether_header *);
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switch (ntohs(eh->ether_type)) {
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case ETHERTYPE_IP:
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start = ETHER_HDR_LEN;
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break;
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case ETHERTYPE_VLAN:
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start = ETHER_HDR_LEN +
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ETHER_VLAN_ENCAP_LEN;
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break;
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default:
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/* unsupported, drop it */
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m_free(m0);
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continue;
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}
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start += m0->m_pkthdr.csum_data >> 16;
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offset = (m0->m_pkthdr.csum_data &
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0xffff) + start;
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flags |= (start <<
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GEM_TD_CXSUM_STARTSHFT) |
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(offset <<
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GEM_TD_CXSUM_STUFFSHFT) |
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GEM_TD_CXSUM_ENABLE;
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}
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#endif
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}
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if (seg == dmamap->dm_nsegs - 1) {
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flags |= GEM_TD_END_OF_PACKET;
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@ -1339,7 +1391,6 @@ gem_rint(sc)
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struct ifnet *ifp = &sc->sc_ethercom.ec_if;
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bus_space_tag_t t = sc->sc_bustag;
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bus_space_handle_t h = sc->sc_h;
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struct ether_header *eh;
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struct gem_rxsoft *rxs;
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struct mbuf *m;
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u_int64_t rxstat;
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@ -1402,11 +1453,8 @@ gem_rint(sc)
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}
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#endif
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/*
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* No errors; receive the packet. Note the Gem
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* includes the CRC with every packet.
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*/
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len = GEM_RD_BUFLEN(rxstat) - ETHER_CRC_LEN;
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/* No errors; receive the packet. */
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len = GEM_RD_BUFLEN(rxstat);
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/*
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* Allocate a new mbuf cluster. If that fails, we are
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@ -1424,7 +1472,6 @@ gem_rint(sc)
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}
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m->m_data += 2; /* We're already off by two */
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eh = mtod(m, struct ether_header *);
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m->m_pkthdr.rcvif = ifp;
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m->m_pkthdr.len = m->m_len = len;
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@ -1437,6 +1484,102 @@ gem_rint(sc)
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bpf_mtap(ifp->if_bpf, m);
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#endif /* NPBFILTER > 0 */
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#ifdef INET
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/* hardware checksum */
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if (ifp->if_csum_flags_rx & (M_CSUM_UDPv4 | M_CSUM_TCPv4)) {
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struct ether_header *eh;
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struct ip *ip;
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struct udphdr *uh;
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int32_t hlen, pktlen;
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if (sc->sc_ethercom.ec_capenable & ETHERCAP_VLAN_MTU) {
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pktlen = m->m_pkthdr.len - ETHER_HDR_LEN -
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ETHER_VLAN_ENCAP_LEN;
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eh = (struct ether_header *) mtod(m, caddr_t) +
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ETHER_VLAN_ENCAP_LEN;
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} else {
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pktlen = m->m_pkthdr.len - ETHER_HDR_LEN;
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eh = mtod(m, struct ether_header *);
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}
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if (ntohs(eh->ether_type) != ETHERTYPE_IP)
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goto swcsum;
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ip = (struct ip *) ((caddr_t)eh + ETHER_HDR_LEN);
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/* IPv4 only */
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if (ip->ip_v != IPVERSION)
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goto swcsum;
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hlen = ip->ip_hl << 2;
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if (hlen < sizeof(struct ip))
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goto swcsum;
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/* too short, truncated, fragment */
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if ((ntohs(ip->ip_len) < hlen) ||
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(ntohs(ip->ip_len) > pktlen) ||
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(ntohs(ip->ip_off) & (IP_MF | IP_OFFMASK)))
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goto swcsum;
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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if (! (ifp->if_csum_flags_rx & M_CSUM_TCPv4))
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goto swcsum;
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if (pktlen < (hlen + sizeof(struct tcphdr)))
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goto swcsum;
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m->m_pkthdr.csum_flags = M_CSUM_TCPv4;
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break;
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case IPPROTO_UDP:
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if (! (ifp->if_csum_flags_rx & M_CSUM_UDPv4))
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goto swcsum;
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if (pktlen < (hlen + sizeof(struct udphdr)))
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goto swcsum;
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uh = (struct udphdr *)((caddr_t)ip + hlen);
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/* no checksum */
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if (uh->uh_sum == 0)
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goto swcsum;
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m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
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break;
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default:
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goto swcsum;
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}
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/* the uncomplemented sum is expected */
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m->m_pkthdr.csum_data = (~rxstat) & GEM_RD_CHECKSUM;
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/* if the pkt had ip options, we have to deduct them */
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if (hlen > sizeof(struct ip)) {
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uint16_t *opts;
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uint32_t optsum, temp;
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optsum = 0;
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temp = hlen - sizeof(struct ip);
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opts = (uint16_t *) ((caddr_t) ip +
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sizeof(struct ip));
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while (temp > 1) {
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optsum += ntohs(*opts++);
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temp -= 2;
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}
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while (optsum >> 16)
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optsum = (optsum >> 16) +
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(optsum & 0xffff);
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/* Deduct ip opts sum from hwsum (rfc 1624). */
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m->m_pkthdr.csum_data =
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~((~m->m_pkthdr.csum_data) - ~optsum);
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while (m->m_pkthdr.csum_data >> 16)
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m->m_pkthdr.csum_data =
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(m->m_pkthdr.csum_data >> 16) +
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(m->m_pkthdr.csum_data &
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0xffff);
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}
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m->m_pkthdr.csum_flags |= M_CSUM_DATA |
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M_CSUM_NO_PSEUDOHDR;
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} else
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swcsum:
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m->m_pkthdr.csum_flags = 0;
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#endif
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/* Pass it on. */
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(*ifp->if_input)(ifp, m);
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}
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