diff options
Diffstat (limited to 'sys/dev/mxge/mxge_lro.c')
| -rw-r--r-- | sys/dev/mxge/mxge_lro.c | 357 |
1 files changed, 0 insertions, 357 deletions
diff --git a/sys/dev/mxge/mxge_lro.c b/sys/dev/mxge/mxge_lro.c deleted file mode 100644 index b313059..0000000 --- a/sys/dev/mxge/mxge_lro.c +++ /dev/null @@ -1,357 +0,0 @@ -/****************************************************************************** - -Copyright (c) 2007-2008, Myricom Inc. -All rights reserved. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are met: - - 1. Redistributions of source code must retain the above copyright notice, - this list of conditions and the following disclaimer. - - 2. Neither the name of the Myricom Inc, nor the names of its - contributors may be used to endorse or promote products derived from - this software without specific prior written permission. - -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" -AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE -LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF -SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN -CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) -ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -POSSIBILITY OF SUCH DAMAGE. - -***************************************************************************/ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/endian.h> -#include <sys/mbuf.h> -#include <sys/kernel.h> -#include <sys/socket.h> -#include <sys/sysctl.h> -#include <sys/bus.h> - -#include <net/if.h> -#include <net/ethernet.h> -#include <net/if_media.h> - -#include <netinet/in_systm.h> -#include <netinet/in.h> -#include <netinet/ip.h> -#include <netinet/tcp.h> - -#include <machine/bus.h> -#include <machine/in_cksum.h> - -#include <dev/mxge/mxge_mcp.h> -#include <dev/mxge/if_mxge_var.h> - -#include "opt_inet.h" - -#ifdef INET - -/* Assume len is a multiple of 4 */ -static uint16_t -mxge_csum_generic(uint16_t *raw, int len) -{ - uint32_t csum; - csum = 0; - while (len > 0) { - csum += *raw; - raw++; - csum += *raw; - raw++; - len -= 4; - } - csum = (csum >> 16) + (csum & 0xffff); - csum = (csum >> 16) + (csum & 0xffff); - return (uint16_t)csum; -} - - -void -mxge_lro_flush(struct mxge_slice_state *ss, struct lro_entry *lro) -{ - mxge_softc_t *mgp = ss->sc; - struct ifnet *ifp; - struct ip *ip; - struct tcphdr *tcp; - uint32_t *ts_ptr; - uint32_t tcplen, tcp_csum; - - if (lro->append_cnt) { - /* incorporate the new len into the ip header and - * re-calculate the checksum */ - ip = lro->ip; - ip->ip_len = htons(lro->len - ETHER_HDR_LEN); - ip->ip_sum = 0; - ip->ip_sum = 0xffff ^ - mxge_csum_generic((uint16_t*)ip, - sizeof (*ip)); - - lro->m_head->m_pkthdr.csum_flags = CSUM_IP_CHECKED | - CSUM_IP_VALID | CSUM_DATA_VALID | CSUM_PSEUDO_HDR; - lro->m_head->m_pkthdr.csum_data = 0xffff; - lro->m_head->m_pkthdr.len = lro->len; - - /* incorporate the latest ack into the tcp header */ - tcp = (struct tcphdr *) (ip + 1); - tcp->th_ack = lro->ack_seq; - tcp->th_win = lro->window; - /* incorporate latest timestamp into the tcp header */ - if (lro->timestamp) { - ts_ptr = (uint32_t *)(tcp + 1); - ts_ptr[1] = htonl(lro->tsval); - ts_ptr[2] = lro->tsecr; - } - /* - * update checksum in tcp header by re-calculating the - * tcp pseudoheader checksum, and adding it to the checksum - * of the tcp payload data - */ - tcp->th_sum = 0; - tcplen = lro->len - sizeof(*ip) - ETHER_HDR_LEN; - tcp_csum = lro->data_csum; - tcp_csum += in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, - htons(tcplen + IPPROTO_TCP)); - tcp_csum += mxge_csum_generic((uint16_t*)tcp, - tcp->th_off << 2); - tcp_csum = (tcp_csum & 0xffff) + (tcp_csum >> 16); - tcp_csum = (tcp_csum & 0xffff) + (tcp_csum >> 16); -#if 0 - IOLog("pseudo = 0x%x, generic = 0x%x, sum = %x\n", - in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, - htons(tcplen + IPPROTO_TCP)), - mxge_csum_generic((uint16_t*)tcp, - tcp->th_off << 2), - htons(0xffff ^ tcp_csum)); -#endif - tcp->th_sum = 0xffff ^ tcp_csum; - } - ifp = mgp->ifp; - (*ifp->if_input)(mgp->ifp, lro->m_head); - ss->lro_queued += lro->append_cnt + 1; - ss->lro_flushed++; - lro->m_head = NULL; - lro->timestamp = 0; - lro->append_cnt = 0; - SLIST_INSERT_HEAD(&ss->lro_free, lro, next); -} - -int -mxge_lro_rx(struct mxge_slice_state *ss, struct mbuf *m_head, uint32_t csum) -{ - struct ether_header *eh; - struct ip *ip; - struct tcphdr *tcp; - uint32_t *ts_ptr; - struct mbuf *m_nxt, *m_tail; - struct lro_entry *lro; - int hlen, ip_len, tcp_hdr_len, tcp_data_len, tot_len; - int opt_bytes, trim; - uint32_t seq, tmp_csum, device_mtu; - - eh = mtod(m_head, struct ether_header *); - if (eh->ether_type != htons(ETHERTYPE_IP)) - return 1; - ip = (struct ip *) (eh + 1); - if (ip->ip_p != IPPROTO_TCP) - return 1; - - /* ensure there are no options */ - if ((ip->ip_hl << 2) != sizeof (*ip)) - return -1; - - /* .. and the packet is not fragmented */ - if (ip->ip_off & htons(IP_MF|IP_OFFMASK)) - return -1; - - /* verify that the IP header checksum is correct */ - tmp_csum = mxge_csum_generic((uint16_t *)ip, sizeof (*ip)); - if (__predict_false((tmp_csum ^ 0xffff) != 0)) { - ss->lro_bad_csum++; - return -1; - } - - /* find the TCP header */ - tcp = (struct tcphdr *) (ip + 1); - - /* ensure no bits set besides ack or psh */ - if ((tcp->th_flags & ~(TH_ACK | TH_PUSH)) != 0) - return -1; - - /* check for timestamps. Since the only option we handle are - timestamps, we only have to handle the simple case of - aligned timestamps */ - - opt_bytes = (tcp->th_off << 2) - sizeof (*tcp); - tcp_hdr_len = sizeof (*tcp) + opt_bytes; - ts_ptr = (uint32_t *)(tcp + 1); - if (opt_bytes != 0) { - if (__predict_false(opt_bytes != TCPOLEN_TSTAMP_APPA) || - (*ts_ptr != ntohl(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP))) - return -1; - } - - ip_len = ntohs(ip->ip_len); - tcp_data_len = ip_len - (tcp->th_off << 2) - sizeof (*ip); - - - /* - * If frame is padded beyond the end of the IP packet, - * then we must trim the extra bytes off the end. - */ - tot_len = m_head->m_pkthdr.len; - trim = tot_len - (ip_len + ETHER_HDR_LEN); - if (trim != 0) { - if (trim < 0) { - /* truncated packet */ - return -1; - } - m_adj(m_head, -trim); - tot_len = m_head->m_pkthdr.len; - } - - m_nxt = m_head; - m_tail = NULL; /* -Wuninitialized */ - while (m_nxt != NULL) { - m_tail = m_nxt; - m_nxt = m_tail->m_next; - } - - hlen = ip_len + ETHER_HDR_LEN - tcp_data_len; - seq = ntohl(tcp->th_seq); - - SLIST_FOREACH(lro, &ss->lro_active, next) { - if (lro->source_port == tcp->th_sport && - lro->dest_port == tcp->th_dport && - lro->source_ip == ip->ip_src.s_addr && - lro->dest_ip == ip->ip_dst.s_addr) { - /* Try to append it */ - - if (__predict_false(seq != lro->next_seq || - (tcp_data_len == 0 && - lro->ack_seq == tcp->th_ack))) { - /* out of order packet or dup ack */ - SLIST_REMOVE(&ss->lro_active, lro, - lro_entry, next); - mxge_lro_flush(ss, lro); - return -1; - } - - if (opt_bytes) { - uint32_t tsval = ntohl(*(ts_ptr + 1)); - /* make sure timestamp values are increasing */ - if (__predict_false(lro->tsval > tsval || - *(ts_ptr + 2) == 0)) { - return -1; - } - lro->tsval = tsval; - lro->tsecr = *(ts_ptr + 2); - } - - lro->next_seq += tcp_data_len; - lro->ack_seq = tcp->th_ack; - lro->window = tcp->th_win; - lro->append_cnt++; - if (tcp_data_len == 0) { - m_freem(m_head); - return 0; - } - /* subtract off the checksum of the tcp header - * from the hardware checksum, and add it to the - * stored tcp data checksum. Byteswap the checksum - * if the total length so far is odd - */ - tmp_csum = mxge_csum_generic((uint16_t*)tcp, - tcp_hdr_len); - csum = csum + (tmp_csum ^ 0xffff); - csum = (csum & 0xffff) + (csum >> 16); - csum = (csum & 0xffff) + (csum >> 16); - if (lro->len & 0x1) { - /* Odd number of bytes so far, flip bytes */ - csum = ((csum << 8) | (csum >> 8)) & 0xffff; - } - csum = csum + lro->data_csum; - csum = (csum & 0xffff) + (csum >> 16); - csum = (csum & 0xffff) + (csum >> 16); - lro->data_csum = csum; - - lro->len += tcp_data_len; - - /* adjust mbuf so that m->m_data points to - the first byte of the payload */ - m_adj(m_head, hlen); - /* append mbuf chain */ - lro->m_tail->m_next = m_head; - /* advance the last pointer */ - lro->m_tail = m_tail; - /* flush packet if required */ - device_mtu = ss->sc->ifp->if_mtu; - if (lro->len > (65535 - device_mtu)) { - SLIST_REMOVE(&ss->lro_active, lro, - lro_entry, next); - mxge_lro_flush(ss, lro); - } - return 0; - } - } - - if (SLIST_EMPTY(&ss->lro_free)) - return -1; - - /* start a new chain */ - lro = SLIST_FIRST(&ss->lro_free); - SLIST_REMOVE_HEAD(&ss->lro_free, next); - SLIST_INSERT_HEAD(&ss->lro_active, lro, next); - lro->source_port = tcp->th_sport; - lro->dest_port = tcp->th_dport; - lro->source_ip = ip->ip_src.s_addr; - lro->dest_ip = ip->ip_dst.s_addr; - lro->next_seq = seq + tcp_data_len; - lro->mss = tcp_data_len; - lro->ack_seq = tcp->th_ack; - lro->window = tcp->th_win; - - /* save the checksum of just the TCP payload by - * subtracting off the checksum of the TCP header from - * the entire hardware checksum - * Since IP header checksum is correct, checksum over - * the IP header is -0. Substracting -0 is unnecessary. - */ - tmp_csum = mxge_csum_generic((uint16_t*)tcp, tcp_hdr_len); - csum = csum + (tmp_csum ^ 0xffff); - csum = (csum & 0xffff) + (csum >> 16); - csum = (csum & 0xffff) + (csum >> 16); - lro->data_csum = csum; - - lro->ip = ip; - /* record timestamp if it is present */ - if (opt_bytes) { - lro->timestamp = 1; - lro->tsval = ntohl(*(ts_ptr + 1)); - lro->tsecr = *(ts_ptr + 2); - } - lro->len = tot_len; - lro->m_head = m_head; - lro->m_tail = m_tail; - return 0; -} - -#endif /* INET */ -/* - This file uses Myri10GE driver indentation. - - Local Variables: - c-file-style:"linux" - tab-width:8 - End: -*/ |
