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xen.950
xsa140-qemut-2.patch
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File xsa140-qemut-2.patch of Package xen.950
References: bsc#939712 XSA-140 From 2d7d80e8dc160904fa7276cc05da26c062a50066 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi <stefanha@redhat.com> Date: Wed, 15 Jul 2015 18:16:59 +0100 Subject: [PATCH 2/7] rtl8139: drop tautologous if (ip) {...} statement The previous patch stopped using the ip pointer as an indicator that the IP header is present. When we reach the if (ip) {...} statement we know ip is always non-NULL. Remove the if statement to reduce nesting. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> --- hw/rtl8139.c | 305 +++++++++++++++++++++++++++---------------------------- 1 file changed, 151 insertions(+), 154 deletions(-) Index: xen-4.4.2-testing/tools/qemu-xen-traditional-dir-remote/hw/rtl8139.c =================================================================== --- xen-4.4.2-testing.orig/tools/qemu-xen-traditional-dir-remote/hw/rtl8139.c +++ xen-4.4.2-testing/tools/qemu-xen-traditional-dir-remote/hw/rtl8139.c @@ -2137,187 +2137,184 @@ static int rtl8139_cplus_transmit_one(RT ip_protocol = ip->ip_p; ip_data_len = be16_to_cpu(ip->ip_len) - hlen; - if (ip) + if (txdw0 & CP_TX_IPCS) { - if (txdw0 & CP_TX_IPCS) - { - DEBUG_PRINT(("RTL8139: +++ C+ mode need IP checksum\n")); + DEBUG_PRINT(("RTL8139: +++ C+ mode need IP checksum\n")); - if (hlen<sizeof(ip_header) || hlen>eth_payload_len) {/* min header length */ - /* bad packet header len */ - /* or packet too short */ - } - else - { - ip->ip_sum = 0; - ip->ip_sum = ip_checksum(ip, hlen); - DEBUG_PRINT(("RTL8139: +++ C+ mode IP header len=%d checksum=%04x\n", hlen, ip->ip_sum)); - } + if (hlen<sizeof(ip_header) || hlen>eth_payload_len) {/* min header length */ + /* bad packet header len */ + /* or packet too short */ } - - if ((txdw0 & CP_TX_LGSEN) && ip_protocol == IP_PROTO_TCP) + else { -#if defined (DEBUG_RTL8139) - int large_send_mss = (txdw0 >> 16) & CP_TC_LGSEN_MSS_MASK; -#endif - DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task TSO MTU=%d IP data %d frame data %d specified MSS=%d\n", - ETH_MTU, ip_data_len, saved_size - ETH_HLEN, large_send_mss)); - - int tcp_send_offset = 0; - int send_count = 0; + ip->ip_sum = 0; + ip->ip_sum = ip_checksum(ip, hlen); + DEBUG_PRINT(("RTL8139: +++ C+ mode IP header len=%d checksum=%04x\n", hlen, ip->ip_sum)); + } + } - /* maximum IP header length is 60 bytes */ - uint8_t saved_ip_header[60]; + if ((txdw0 & CP_TX_LGSEN) && ip_protocol == IP_PROTO_TCP) + { + int large_send_mss = (txdw0 >> 16) & CP_TC_LGSEN_MSS_MASK; - /* save IP header template; data area is used in tcp checksum calculation */ - memcpy(saved_ip_header, eth_payload_data, hlen); + DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task TSO MTU=%d IP data %d frame data %d specified MSS=%d\n", + ETH_MTU, ip_data_len, saved_size - ETH_HLEN, large_send_mss)); - /* a placeholder for checksum calculation routine in tcp case */ - uint8_t *data_to_checksum = eth_payload_data + hlen - 12; - // size_t data_to_checksum_len = eth_payload_len - hlen + 12; + int tcp_send_offset = 0; + int send_count = 0; - /* pointer to TCP header */ - tcp_header *p_tcp_hdr = (tcp_header*)(eth_payload_data + hlen); + /* maximum IP header length is 60 bytes */ + uint8_t saved_ip_header[60]; - int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr); + /* save IP header template; data area is used in tcp checksum calculation */ + memcpy(saved_ip_header, eth_payload_data, hlen); - /* ETH_MTU = ip header len + tcp header len + payload */ - int tcp_data_len = ip_data_len - tcp_hlen; - int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen; + /* a placeholder for checksum calculation routine in tcp case */ + uint8_t *data_to_checksum = eth_payload_data + hlen - 12; + // size_t data_to_checksum_len = eth_payload_len - hlen + 12; - DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP data len %d TCP hlen %d TCP data len %d TCP chunk size %d\n", - ip_data_len, tcp_hlen, tcp_data_len, tcp_chunk_size)); + /* pointer to TCP header */ + tcp_header *p_tcp_hdr = (tcp_header*)(eth_payload_data + hlen); - /* note the cycle below overwrites IP header data, - but restores it from saved_ip_header before sending packet */ + int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr); - int is_last_frame = 0; + /* ETH_MTU = ip header len + tcp header len + payload */ + int tcp_data_len = ip_data_len - tcp_hlen; + int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen; - for (tcp_send_offset = 0; tcp_send_offset < tcp_data_len; tcp_send_offset += tcp_chunk_size) - { - uint16_t chunk_size = tcp_chunk_size; + DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP data len %d TCP hlen %d TCP data len %d TCP chunk size %d\n", + ip_data_len, tcp_hlen, tcp_data_len, tcp_chunk_size)); - /* check if this is the last frame */ - if (tcp_send_offset + tcp_chunk_size >= tcp_data_len) - { - is_last_frame = 1; - chunk_size = tcp_data_len - tcp_send_offset; - } + /* note the cycle below overwrites IP header data, + but restores it from saved_ip_header before sending packet */ - DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP seqno %08x\n", be32_to_cpu(p_tcp_hdr->th_seq))); + int is_last_frame = 0; - /* add 4 TCP pseudoheader fields */ - /* copy IP source and destination fields */ - memcpy(data_to_checksum, saved_ip_header + 12, 8); + for (tcp_send_offset = 0; tcp_send_offset < tcp_data_len; tcp_send_offset += tcp_chunk_size) + { + uint16_t chunk_size = tcp_chunk_size; - DEBUG_PRINT(("RTL8139: +++ C+ mode TSO calculating TCP checksum for packet with %d bytes data\n", tcp_hlen + chunk_size)); + /* check if this is the last frame */ + if (tcp_send_offset + tcp_chunk_size >= tcp_data_len) + { + is_last_frame = 1; + chunk_size = tcp_data_len - tcp_send_offset; + } - if (tcp_send_offset) - { - memcpy((uint8_t*)p_tcp_hdr + tcp_hlen, (uint8_t*)p_tcp_hdr + tcp_hlen + tcp_send_offset, chunk_size); - } + DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP seqno %08x\n", be32_to_cpu(p_tcp_hdr->th_seq))); - /* keep PUSH and FIN flags only for the last frame */ - if (!is_last_frame) - { - TCP_HEADER_CLEAR_FLAGS(p_tcp_hdr, TCP_FLAG_PUSH|TCP_FLAG_FIN); - } + /* add 4 TCP pseudoheader fields */ + /* copy IP source and destination fields */ + memcpy(data_to_checksum, saved_ip_header + 12, 8); - /* recalculate TCP checksum */ - ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum; - p_tcpip_hdr->zeros = 0; - p_tcpip_hdr->ip_proto = IP_PROTO_TCP; - p_tcpip_hdr->ip_payload = cpu_to_be16(tcp_hlen + chunk_size); + DEBUG_PRINT(("RTL8139: +++ C+ mode TSO calculating TCP checksum for packet with %d bytes data\n", tcp_hlen + chunk_size)); - p_tcp_hdr->th_sum = 0; + if (tcp_send_offset) + { + DEBUG_PRINT(("RTL8139: +++ C+ mode calculating TCP checksum for packet with %d bytes data\n", ip_data_len)); + memcpy((uint8_t*)p_tcp_hdr + tcp_hlen, (uint8_t*)p_tcp_hdr + tcp_hlen + tcp_send_offset, chunk_size); + } - int tcp_checksum = ip_checksum(data_to_checksum, tcp_hlen + chunk_size + 12); - DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP checksum %04x\n", tcp_checksum)); + /* keep PUSH and FIN flags only for the last frame */ + if (!is_last_frame) + { + TCP_HEADER_CLEAR_FLAGS(p_tcp_hdr, TCP_FLAG_PUSH|TCP_FLAG_FIN); + } - p_tcp_hdr->th_sum = tcp_checksum; + /* recalculate TCP checksum */ + ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum; + p_tcpip_hdr->zeros = 0; + p_tcpip_hdr->ip_proto = IP_PROTO_TCP; + p_tcpip_hdr->ip_payload = cpu_to_be16(tcp_hlen + chunk_size); - /* restore IP header */ - memcpy(eth_payload_data, saved_ip_header, hlen); + p_tcp_hdr->th_sum = 0; - /* set IP data length and recalculate IP checksum */ - ip->ip_len = cpu_to_be16(hlen + tcp_hlen + chunk_size); + int tcp_checksum = ip_checksum(data_to_checksum, tcp_hlen + chunk_size + 12); + DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP checksum %04x\n", tcp_checksum)); - /* increment IP id for subsequent frames */ - ip->ip_id = cpu_to_be16(tcp_send_offset/tcp_chunk_size + be16_to_cpu(ip->ip_id)); + p_tcp_hdr->th_sum = tcp_checksum; - ip->ip_sum = 0; - ip->ip_sum = ip_checksum(eth_payload_data, hlen); - DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP header len=%d checksum=%04x\n", hlen, ip->ip_sum)); + /* restore IP header */ + memcpy(eth_payload_data, saved_ip_header, hlen); - int tso_send_size = ETH_HLEN + hlen + tcp_hlen + chunk_size; - DEBUG_PRINT(("RTL8139: +++ C+ mode TSO transferring packet size %d\n", tso_send_size)); - rtl8139_transfer_frame(s, saved_buffer, tso_send_size, 0); + /* set IP data length and recalculate IP checksum */ + ip->ip_len = cpu_to_be16(hlen + tcp_hlen + chunk_size); - /* add transferred count to TCP sequence number */ - p_tcp_hdr->th_seq = cpu_to_be32(chunk_size + be32_to_cpu(p_tcp_hdr->th_seq)); - ++send_count; - } + /* increment IP id for subsequent frames */ + ip->ip_id = cpu_to_be16(tcp_send_offset/tcp_chunk_size + be16_to_cpu(ip->ip_id)); - /* Stop sending this frame */ - saved_size = 0; + ip->ip_sum = 0; + ip->ip_sum = ip_checksum(eth_payload_data, hlen); + DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP header len=%d checksum=%04x\n", hlen, ip->ip_sum)); + + int tso_send_size = ETH_HLEN + hlen + tcp_hlen + chunk_size; + DEBUG_PRINT(("RTL8139: +++ C+ mode TSO transferring packet size %d\n", tso_send_size)); + rtl8139_transfer_frame(s, saved_buffer, tso_send_size, 0); + + /* add transferred count to TCP sequence number */ + p_tcp_hdr->th_seq = cpu_to_be32(chunk_size + be32_to_cpu(p_tcp_hdr->th_seq)); + ++send_count; } - else if (txdw0 & (CP_TX_TCPCS|CP_TX_UDPCS)) - { - DEBUG_PRINT(("RTL8139: +++ C+ mode need TCP or UDP checksum\n")); - /* maximum IP header length is 60 bytes */ - uint8_t saved_ip_header[60]; - memcpy(saved_ip_header, eth_payload_data, hlen); + /* Stop sending this frame */ + saved_size = 0; + } + else if (txdw0 & (CP_TX_TCPCS|CP_TX_UDPCS)) + { + DEBUG_PRINT(("RTL8139: +++ C+ mode need TCP or UDP checksum\n")); - uint8_t *data_to_checksum = eth_payload_data + hlen - 12; - // size_t data_to_checksum_len = eth_payload_len - hlen + 12; + /* maximum IP header length is 60 bytes */ + uint8_t saved_ip_header[60]; + memcpy(saved_ip_header, eth_payload_data, hlen); - /* add 4 TCP pseudoheader fields */ - /* copy IP source and destination fields */ - memcpy(data_to_checksum, saved_ip_header + 12, 8); + uint8_t *data_to_checksum = eth_payload_data + hlen - 12; + // size_t data_to_checksum_len = eth_payload_len - hlen + 12; - if ((txdw0 & CP_TX_TCPCS) && ip_protocol == IP_PROTO_TCP) - { - DEBUG_PRINT(("RTL8139: +++ C+ mode calculating TCP checksum for packet with %d bytes data\n", ip_data_len)); + /* add 4 TCP pseudoheader fields */ + /* copy IP source and destination fields */ + memcpy(data_to_checksum, saved_ip_header + 12, 8); - ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum; - p_tcpip_hdr->zeros = 0; - p_tcpip_hdr->ip_proto = IP_PROTO_TCP; - p_tcpip_hdr->ip_payload = cpu_to_be16(ip_data_len); + if ((txdw0 & CP_TX_TCPCS) && ip_protocol == IP_PROTO_TCP) + { + DEBUG_PRINT(("RTL8139: +++ C+ mode calculating TCP checksum for packet with %d bytes data\n", ip_data_len)); - tcp_header* p_tcp_hdr = (tcp_header *) (data_to_checksum+12); + ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum; + p_tcpip_hdr->zeros = 0; + p_tcpip_hdr->ip_proto = IP_PROTO_TCP; + p_tcpip_hdr->ip_payload = cpu_to_be16(ip_data_len); - p_tcp_hdr->th_sum = 0; + tcp_header* p_tcp_hdr = (tcp_header *) (data_to_checksum+12); - int tcp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12); - DEBUG_PRINT(("RTL8139: +++ C+ mode TCP checksum %04x\n", tcp_checksum)); + p_tcp_hdr->th_sum = 0; - p_tcp_hdr->th_sum = tcp_checksum; - } - else if ((txdw0 & CP_TX_UDPCS) && ip_protocol == IP_PROTO_UDP) - { - DEBUG_PRINT(("RTL8139: +++ C+ mode calculating UDP checksum for packet with %d bytes data\n", ip_data_len)); + int tcp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12); + DEBUG_PRINT(("RTL8139: +++ C+ mode TCP checksum %04x\n", tcp_checksum)); - ip_pseudo_header *p_udpip_hdr = (ip_pseudo_header *)data_to_checksum; - p_udpip_hdr->zeros = 0; - p_udpip_hdr->ip_proto = IP_PROTO_UDP; - p_udpip_hdr->ip_payload = cpu_to_be16(ip_data_len); + p_tcp_hdr->th_sum = tcp_checksum; + } + else if ((txdw0 & CP_TX_UDPCS) && ip_protocol == IP_PROTO_UDP) + { + DEBUG_PRINT(("RTL8139: +++ C+ mode calculating UDP checksum for packet with %d bytes data\n", ip_data_len)); - udp_header *p_udp_hdr = (udp_header *) (data_to_checksum+12); + ip_pseudo_header *p_udpip_hdr = (ip_pseudo_header *)data_to_checksum; + p_udpip_hdr->zeros = 0; + p_udpip_hdr->ip_proto = IP_PROTO_UDP; + p_udpip_hdr->ip_payload = cpu_to_be16(ip_data_len); - p_udp_hdr->uh_sum = 0; + udp_header *p_udp_hdr = (udp_header *) (data_to_checksum+12); - int udp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12); - DEBUG_PRINT(("RTL8139: +++ C+ mode UDP checksum %04x\n", udp_checksum)); + p_udp_hdr->uh_sum = 0; - p_udp_hdr->uh_sum = udp_checksum; - } + int udp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12); + DEBUG_PRINT(("RTL8139: +++ C+ mode UDP checksum %04x\n", udp_checksum)); - /* restore IP header */ - memcpy(eth_payload_data, saved_ip_header, hlen); + p_udp_hdr->uh_sum = udp_checksum; } + + /* restore IP header */ + memcpy(eth_payload_data, saved_ip_header, hlen); } - } + } skip_offload: /* update tally counter */
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