|
| From: | Akihiko Odaki |
| Subject: | Re: [PATCH v2 32/41] igb: Implement Rx SCTP CSO |
| Date: | Fri, 21 Apr 2023 02:56:29 +0900 |
| User-agent: | Mozilla/5.0 (X11; Linux aarch64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 |
On 2023/04/21 1:22, Sriram Yagnaraman wrote:
-----Original Message----- From: Akihiko Odaki <akihiko.odaki@daynix.com> Sent: Thursday, 20 April 2023 07:47 Cc: Sriram Yagnaraman <sriram.yagnaraman@est.tech>; Jason Wang <jasowang@redhat.com>; Dmitry Fleytman <dmitry.fleytman@gmail.com>; Michael S . Tsirkin <mst@redhat.com>; Alex Bennée <alex.bennee@linaro.org>; Philippe Mathieu-Daudé <philmd@linaro.org>; Thomas Huth <thuth@redhat.com>; Wainer dos Santos Moschetta <wainersm@redhat.com>; Beraldo Leal <bleal@redhat.com>; Cleber Rosa <crosa@redhat.com>; Laurent Vivier <lvivier@redhat.com>; Paolo Bonzini <pbonzini@redhat.com>; qemu-devel@nongnu.org; Tomasz Dzieciol <t.dzieciol@partner.samsung.com>; Akihiko Odaki <akihiko.odaki@daynix.com> Subject: [PATCH v2 32/41] igb: Implement Rx SCTP CSO Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com> --- hw/net/igb_regs.h | 1 + include/net/eth.h | 4 ++- include/qemu/crc32c.h | 1 + hw/net/e1000e_core.c | 5 ++++ hw/net/igb_core.c | 15 +++++++++- hw/net/net_rx_pkt.c | 64 +++++++++++++++++++++++++++++++++++-------- net/eth.c | 4 +++ util/crc32c.c | 8 ++++++ 8 files changed, 89 insertions(+), 13 deletions(-) diff --git a/hw/net/igb_regs.h b/hw/net/igb_regs.h index e6ac26dc0e..4b4ebd3369 100644 --- a/hw/net/igb_regs.h +++ b/hw/net/igb_regs.h @@ -670,6 +670,7 @@ union e1000_adv_rx_desc { #define E1000_ADVRXD_PKT_IP6 BIT(6) #define E1000_ADVRXD_PKT_TCP BIT(8) #define E1000_ADVRXD_PKT_UDP BIT(9) +#define E1000_ADVRXD_PKT_SCTP BIT(10) static inline uint8_t igb_ivar_entry_rx(uint8_t i) { diff --git a/include/net/eth.h b/include/net/eth.h index 048e434685..75e7f1551c 100644 --- a/include/net/eth.h +++ b/include/net/eth.h @@ -224,6 +224,7 @@ struct tcp_hdr { #define IP_HEADER_VERSION_6 (6) #define IP_PROTO_TCP (6) #define IP_PROTO_UDP (17) +#define IP_PROTO_SCTP (132) #define IPTOS_ECN_MASK 0x03 #define IPTOS_ECN(x) ((x) & IPTOS_ECN_MASK) #define IPTOS_ECN_CE 0x03 @@ -379,7 +380,8 @@ typedef struct eth_ip4_hdr_info_st { typedef enum EthL4HdrProto { ETH_L4_HDR_PROTO_INVALID, ETH_L4_HDR_PROTO_TCP, - ETH_L4_HDR_PROTO_UDP + ETH_L4_HDR_PROTO_UDP, + ETH_L4_HDR_PROTO_SCTP } EthL4HdrProto; typedef struct eth_l4_hdr_info_st { diff --git a/include/qemu/crc32c.h b/include/qemu/crc32c.h index 5b78884c38..88b4d2b3b3 100644 --- a/include/qemu/crc32c.h +++ b/include/qemu/crc32c.h @@ -30,5 +30,6 @@ uint32_t crc32c(uint32_t crc, const uint8_t *data, unsigned int length); +uint32_t iov_crc32c(uint32_t crc, const struct iovec *iov, size_t +iov_cnt); #endif diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c index 27124bba07..8b35735799 100644 --- a/hw/net/e1000e_core.c +++ b/hw/net/e1000e_core.c @@ -1114,6 +1114,11 @@ e1000e_verify_csum_in_sw(E1000ECore *core, return; } + if (l4hdr_proto != ETH_L4_HDR_PROTO_TCP && + l4hdr_proto != ETH_L4_HDR_PROTO_UDP) { + return; + } + if (!net_rx_pkt_validate_l4_csum(pkt, &csum_valid)) { trace_e1000e_rx_metadata_l4_csum_validation_failed(); return; diff --git a/hw/net/igb_core.c b/hw/net/igb_core.c index 4dc8e3ae7b..b7f7e765a5 100644 --- a/hw/net/igb_core.c +++ b/hw/net/igb_core.c @@ -1212,7 +1212,7 @@ igb_build_rx_metadata(IGBCore *core, uint16_t *vlan_tag) { struct virtio_net_hdr *vhdr; - bool hasip4, hasip6; + bool hasip4, hasip6, csum_valid; EthL4HdrProto l4hdr_proto; *status_flags = E1000_RXD_STAT_DD; @@ -1272,6 +1272,10 @@ igb_build_rx_metadata(IGBCore *core, *pkt_info |= E1000_ADVRXD_PKT_UDP; break; + case ETH_L4_HDR_PROTO_SCTP: + *pkt_info |= E1000_ADVRXD_PKT_SCTP; + break; + default: break; } @@ -1304,6 +1308,15 @@ igb_build_rx_metadata(IGBCore *core, if (igb_rx_l4_cso_enabled(core)) { switch (l4hdr_proto) { + case ETH_L4_HDR_PROTO_SCTP: + if (!net_rx_pkt_validate_l4_csum(pkt, &csum_valid)) {Forgive my naive question, doesn't tap device validate SCTP checksum? Is it something we can improve? I can help with adding in linux tap device if you think that would make this code simpler, just like UDP/TCP.
No, Linux does not provide an option to enable SCTP checksum offloading for a tap device so we have no choice but validating checksum by ourselves.
+ trace_e1000e_rx_metadata_l4_csum_validation_failed(); + goto func_exit; + } + if (!csum_valid) { + *status_flags |= E1000_RXDEXT_STATERR_TCPE; + } + /* fall through */ case ETH_L4_HDR_PROTO_TCP: *status_flags |= E1000_RXD_STAT_TCPCS; break; diff --git a/hw/net/net_rx_pkt.c b/hw/net/net_rx_pkt.c index 1de42b4f51..3575c8b9f9 100644 --- a/hw/net/net_rx_pkt.c +++ b/hw/net/net_rx_pkt.c @@ -16,6 +16,7 @@ */ #include "qemu/osdep.h" +#include "qemu/crc32c.h" #include "trace.h" #include "net_rx_pkt.h" #include "net/checksum.h" @@ -554,32 +555,73 @@ _net_rx_pkt_calc_l4_csum(struct NetRxPkt *pkt) return csum; } -bool net_rx_pkt_validate_l4_csum(struct NetRxPkt *pkt, bool *csum_valid) +static bool +_net_rx_pkt_validate_sctp_sum(struct NetRxPkt *pkt) { - uint16_t csum; + size_t csum_off; + size_t off = pkt->l4hdr_off; + size_t vec_len = pkt->vec_len; + struct iovec *vec; + uint32_t calculated = 0; + uint32_t original; + bool valid; - trace_net_rx_pkt_l4_csum_validate_entry(); + for (vec = pkt->vec; vec->iov_len < off; vec++) { + off -= vec->iov_len; + vec_len--; + } - if (pkt->l4hdr_info.proto != ETH_L4_HDR_PROTO_TCP && - pkt->l4hdr_info.proto != ETH_L4_HDR_PROTO_UDP) { - trace_net_rx_pkt_l4_csum_validate_not_xxp(); + csum_off = off + 8; + + if (!iov_to_buf(vec, vec_len, csum_off, &original, + sizeof(original))) { return false; } - if (pkt->l4hdr_info.proto == ETH_L4_HDR_PROTO_UDP && - pkt->l4hdr_info.hdr.udp.uh_sum == 0) { - trace_net_rx_pkt_l4_csum_validate_udp_with_no_checksum(); + if (!iov_from_buf(vec, vec_len, csum_off, + &calculated, sizeof(calculated))) { return false; } + calculated = crc32c(0xffffffff, + (uint8_t *)vec->iov_base + off, vec->iov_len - off); + calculated = iov_crc32c(calculated ^ 0xffffffff, vec + 1, vec_len - 1); + valid = calculated == le32_to_cpu(original); + iov_from_buf(vec, vec_len, csum_off, &original, sizeof(original)); + + return valid; +} + +bool net_rx_pkt_validate_l4_csum(struct NetRxPkt *pkt, bool +*csum_valid) { + uint32_t csum; + + trace_net_rx_pkt_l4_csum_validate_entry(); + if (pkt->hasip4 && pkt->ip4hdr_info.fragment) { trace_net_rx_pkt_l4_csum_validate_ip4_fragment(); return false; } - csum = _net_rx_pkt_calc_l4_csum(pkt); + switch (pkt->l4hdr_info.proto) { + case ETH_L4_HDR_PROTO_UDP: + if (pkt->l4hdr_info.hdr.udp.uh_sum == 0) { + trace_net_rx_pkt_l4_csum_validate_udp_with_no_checksum(); + return false; + } + /* fall through */ + case ETH_L4_HDR_PROTO_TCP: + csum = _net_rx_pkt_calc_l4_csum(pkt); + *csum_valid = ((csum == 0) || (csum == 0xFFFF)); + break; + + case ETH_L4_HDR_PROTO_SCTP: + *csum_valid = _net_rx_pkt_validate_sctp_sum(pkt); + break; - *csum_valid = ((csum == 0) || (csum == 0xFFFF)); + default: + trace_net_rx_pkt_l4_csum_validate_not_xxp(); + return false; + } trace_net_rx_pkt_l4_csum_validate_csum(*csum_valid); diff --git a/net/eth.c b/net/eth.c index 5307978486..7f02aea010 100644 --- a/net/eth.c +++ b/net/eth.c @@ -211,6 +211,10 @@ void eth_get_protocols(const struct iovec *iov, size_t iovcnt, size_t iovoff, *l5hdr_off = *l4hdr_off + sizeof(l4hdr_info->hdr.udp); } break; + + case IP_PROTO_SCTP: + l4hdr_info->proto = ETH_L4_HDR_PROTO_SCTP; + break; } } diff --git a/util/crc32c.c b/util/crc32c.c index 762657d853..ea7f345de8 100644 --- a/util/crc32c.c +++ b/util/crc32c.c @@ -113,3 +113,11 @@ uint32_t crc32c(uint32_t crc, const uint8_t *data, unsigned int length) return crc^0xffffffff; } +uint32_t iov_crc32c(uint32_t crc, const struct iovec *iov, size_t +iov_cnt) { + while (iov_cnt--) { + crc = crc32c(crc, iov->iov_base, iov->iov_len) ^ 0xffffffff; + iov++; + } + return crc ^ 0xffffffff; +} -- 2.40.0
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