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Re: [PATCH v2 1/2] igb: RX descriptors handling cleanup
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From: |
Tomasz Dzieciol |
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Subject: |
Re: [PATCH v2 1/2] igb: RX descriptors handling cleanup |
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Date: |
Thu, 27 Apr 2023 09:48:26 +0200 |
On Thu, Apr 27, 2023 at 04:24:10PM +0900, Akihiko Odaki wrote:
> On 2023/04/27 1:09, Tomasz Dzieciol wrote:
> > Format of Intel 82576 was changed in comparison to Intel 82574 extended
> > descriptors. This change updates filling of advanced descriptors fields
> > accordingly:
> > * remove TCP ACK detection
> > * add IPv6 with extensions traffic detection
> > * fragment checksum and IP ID is filled only when RXCSUM.IPPCSE is set (in
> > addition to RXCSUM.PCSD bit cleared condition)
> >
> > Refactoring is done in preparation for support of multiple advanced
> > descriptors RX modes, especially packet-split modes.
> >
> > Signed-off-by: Tomasz Dzieciol <t.dzieciol@partner.samsung.com>
>
> As I wrote earlier:
> > Please rebase to:
> > https://protect2.fireeye.com/v1/url?k=512318e9-30a80dd9-512293a6-000babffaa23-3bee4c44b5723bf0&q=1&e=355018c1-72f7-43ba-be71-fd86193bc66d&u=https%3A%2F%2Fpatchew.org%2FQEMU%2F20230420054657.50367-1-akihiko.odaki%40daynix.com%2F
> >
> > And add a cover letter with the following lines:
> > Based-on: <20230420054657.50367-1-akihiko.odaki@daynix.com>
> > ("[PATCH v2 00/41] igb: Fix for DPDK")
> >
> > I want the series to be merged first as it includes several bug fixes.
>
> Also, next time CC: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
> He is a reviewer of igb.
I rebased it to v3, just didn't added cover letter. Should I rebase it to v2 as
pointed by the link you provided or to v4 as it it currently the newest?
I will apply rest of comments.
>
> > ---
> > hw/net/e1000e_core.c | 16 +-
> > hw/net/e1000x_regs.h | 1 +
> > hw/net/igb_core.c | 505 ++++++++++++++++++++++++---------------
> > hw/net/igb_regs.h | 21 +-
> > hw/net/trace-events | 6 +-
> > tests/qtest/libqos/igb.c | 5 +
> > 6 files changed, 344 insertions(+), 210 deletions(-)
> >
> > diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c
> > index 78373d7db7..d874809d93 100644
> > --- a/hw/net/e1000e_core.c
> > +++ b/hw/net/e1000e_core.c
> > @@ -1418,11 +1418,11 @@ e1000e_write_hdr_to_rx_buffers(E1000ECore *core,
> > }
> > static void
> > -e1000e_write_to_rx_buffers(E1000ECore *core,
> > - hwaddr ba[MAX_PS_BUFFERS],
> > - e1000e_ba_state *bastate,
> > - const char *data,
> > - dma_addr_t data_len)
> > +e1000e_write_payload_to_rx_buffers(E1000ECore *core,
> > + hwaddr ba[MAX_PS_BUFFERS],
> > + e1000e_ba_state *bastate,
> > + const char *data,
> > + dma_addr_t data_len)
> > {
> > while (data_len > 0) {
> > uint32_t cur_buf_len = core->rxbuf_sizes[bastate->cur_idx];
> > @@ -1594,8 +1594,8 @@ e1000e_write_packet_to_guest(E1000ECore *core, struct
> > NetRxPkt *pkt,
> > while (copy_size) {
> > iov_copy = MIN(copy_size, iov->iov_len - iov_ofs);
> > - e1000e_write_to_rx_buffers(core, ba, &bastate,
> > - iov->iov_base + iov_ofs,
> > iov_copy);
> > + e1000e_write_payload_to_rx_buffers(core, ba, &bastate,
> > + iov->iov_base +
> > iov_ofs, iov_copy);
> > copy_size -= iov_copy;
> > iov_ofs += iov_copy;
> > @@ -1607,7 +1607,7 @@ e1000e_write_packet_to_guest(E1000ECore *core, struct
> > NetRxPkt *pkt,
> > if (desc_offset + desc_size >= total_size) {
> > /* Simulate FCS checksum presence in the last
> > descriptor */
> > - e1000e_write_to_rx_buffers(core, ba, &bastate,
> > + e1000e_write_payload_to_rx_buffers(core, ba, &bastate,
> > (const char *) &fcs_pad,
> > e1000x_fcs_len(core->mac));
> > }
> > }
> > diff --git a/hw/net/e1000x_regs.h b/hw/net/e1000x_regs.h
> > index 13760c66d3..344fd10359 100644
> > --- a/hw/net/e1000x_regs.h
> > +++ b/hw/net/e1000x_regs.h
> > @@ -827,6 +827,7 @@ union e1000_rx_desc_packet_split {
> > /* Receive Checksum Control bits */
> > #define E1000_RXCSUM_IPOFLD 0x100 /* IP Checksum Offload Enable */
> > #define E1000_RXCSUM_TUOFLD 0x200 /* TCP/UDP Checksum Offload
> > Enable */
> > +#define E1000_RXCSUM_IPPCSE 0x1000 /* IP Payload Checksum enable */
> > #define E1000_RXCSUM_PCSD 0x2000 /* Packet Checksum Disable */
> > #define E1000_RING_DESC_LEN (16)
> > diff --git a/hw/net/igb_core.c b/hw/net/igb_core.c
> > index 96b7335b31..47c4a16e84 100644
> > --- a/hw/net/igb_core.c
> > +++ b/hw/net/igb_core.c
> > @@ -267,6 +267,21 @@ igb_rx_use_legacy_descriptor(IGBCore *core)
> > return false;
> > }
> > +typedef struct E1000E_RingInfo_st {
> > + int dbah;
> > + int dbal;
> > + int dlen;
> > + int dh;
> > + int dt;
> > + int idx;
> > +} E1000E_RingInfo;
> > +
> > +static uint32_t
> > +igb_rx_queue_desctyp_get(IGBCore *core, const E1000E_RingInfo *r)
> > +{
> > + return core->mac[E1000_SRRCTL(r->idx) >> 2] &
> > E1000_SRRCTL_DESCTYPE_MASK;
> > +}
> > +
> > static inline bool
> > igb_rss_enabled(IGBCore *core)
> > {
> > @@ -694,15 +709,6 @@ static uint32_t igb_rx_wb_eic(IGBCore *core, int
> > queue_idx)
> > return (ent & E1000_IVAR_VALID) ? BIT(ent & 0x1f) : 0;
> > }
> > -typedef struct E1000E_RingInfo_st {
> > - int dbah;
> > - int dbal;
> > - int dlen;
> > - int dh;
> > - int dt;
> > - int idx;
> > -} E1000E_RingInfo;
> > -
> > static inline bool
> > igb_ring_empty(IGBCore *core, const E1000E_RingInfo *r)
> > {
> > @@ -941,6 +947,14 @@ igb_has_rxbufs(IGBCore *core, const E1000E_RingInfo
> > *r, size_t total_size)
> > bufsize;
> > }
> > +static uint32_t
> > +igb_get_queue_rx_header_buf_size(IGBCore *core, const E1000E_RingInfo *r)
> > +{
> > + uint32_t srr_size = (core->mac[E1000_SRRCTL(r->idx) >> 2] &
> > + E1000_SRRCTL_BSIZEHDR_MASK) >> 8;
> > + return srr_size * 64;
>
> Instead, do:
> uint32_t srrctl = core->mac[E1000_SRRCTL(r->idx) >> 2];
> return (srrctl & E1000_SRRCTL_BSIZEHDRSIZE_MASK) >>
> E1000_SRRCTL_BSIZEHDRSIZE_SHIFT;
>
> x >> E1000_SRRCTL_BSIZEHDRSIZE_SHIFT is identical with: (x >> 8) * 64
>
> Also, you should use E1000_SRRCTL_BSIZEHDRSIZE_MASK rather than
> E1000_SRRCTL_BSIZEHDR_MASK here. Section 8.10.2 of the datasheet says the
> field is 3-bit.
>
> > +}
> > +
> > void
> > igb_start_recv(IGBCore *core)
> > {
> > @@ -1225,21 +1239,34 @@ igb_read_lgcy_rx_descr(IGBCore *core, struct
> > e1000_rx_desc *desc,
> > }
> > static inline void
> > -igb_read_adv_rx_descr(IGBCore *core, union e1000_adv_rx_desc *desc,
> > - hwaddr *buff_addr)
> > +igb_read_adv_rx_single_buf_descr(IGBCore *core, union e1000_adv_rx_desc
> > *desc,
> > + hwaddr *buff_addr)
> > {
> > *buff_addr = le64_to_cpu(desc->read.pkt_addr);
> > }
> > static inline void
> > igb_read_rx_descr(IGBCore *core, union e1000_rx_desc_union *desc,
> > - hwaddr *buff_addr)
> > + hwaddr buff_addr[MAX_PS_BUFFERS],
>
> Don't use an array here. Instead use a struct as e1000_adv_rx_desc does; it
> will be more explicit and easier to read. And I think this should be rather
> part of the next patch.
>
> > + const E1000E_RingInfo *r)
> > {
> > + uint32_t desc_type;
> > +
> > if (igb_rx_use_legacy_descriptor(core)) {
> > - igb_read_lgcy_rx_descr(core, &desc->legacy, buff_addr);
> > - } else {
> > - igb_read_adv_rx_descr(core, &desc->adv, buff_addr);
> > + igb_read_lgcy_rx_descr(core, &desc->legacy, &buff_addr[1]);
> > + buff_addr[0] = 0;
> > + return;
> > }
> > +
> > + /* modes other than advanced single buffer descriptor not supported */
> > + desc_type = igb_rx_queue_desctyp_get(core, r);
> > + if (desc_type != E1000_SRRCTL_DESCTYPE_ADV_ONEBUF) {
> > + trace_igb_wrn_rx_desc_modes_not_supp(desc_type);
> > + }
> > +
> > + /* advanced single buffer descriptor */
> > + igb_read_adv_rx_single_buf_descr(core, &desc->adv, &buff_addr[1]);
> > + buff_addr[0] = 0;
> > }
> > static void
> > @@ -1281,15 +1308,11 @@ igb_verify_csum_in_sw(IGBCore *core,
> > }
> > static void
> > -igb_build_rx_metadata(IGBCore *core,
> > - struct NetRxPkt *pkt,
> > - bool is_eop,
> > - const E1000E_RSSInfo *rss_info, uint16_t etqf, bool
> > ts,
> > - uint16_t *pkt_info, uint16_t *hdr_info,
> > - uint32_t *rss,
> > - uint32_t *status_flags,
> > - uint16_t *ip_id,
> > - uint16_t *vlan_tag)
> > +igb_build_rx_metadata_common(IGBCore *core,
> > + struct NetRxPkt *pkt,
> > + bool is_eop,
> > + uint32_t *status_flags,
> > + uint16_t *vlan_tag)
> > {
> > struct virtio_net_hdr *vhdr;
> > bool hasip4, hasip6, csum_valid;
> > @@ -1298,7 +1321,6 @@ igb_build_rx_metadata(IGBCore *core,
> > *status_flags = E1000_RXD_STAT_DD;
> > /* No additional metadata needed for non-EOP descriptors */
> > - /* TODO: EOP apply only to status so don't skip whole function. */
> > if (!is_eop) {
> > goto func_exit;
> > }
> > @@ -1315,64 +1337,6 @@ igb_build_rx_metadata(IGBCore *core,
> > trace_e1000e_rx_metadata_vlan(*vlan_tag);
> > }
> > - /* Packet parsing results */
> > - if ((core->mac[RXCSUM] & E1000_RXCSUM_PCSD) != 0) {
> > - if (rss_info->enabled) {
> > - *rss = cpu_to_le32(rss_info->hash);
> > - trace_igb_rx_metadata_rss(*rss);
> > - }
> > - } else if (hasip4) {
> > - *status_flags |= E1000_RXD_STAT_IPIDV;
> > - *ip_id = cpu_to_le16(net_rx_pkt_get_ip_id(pkt));
> > - trace_e1000e_rx_metadata_ip_id(*ip_id);
> > - }
> > -
> > - if (l4hdr_proto == ETH_L4_HDR_PROTO_TCP && net_rx_pkt_is_tcp_ack(pkt))
> > {
> > - *status_flags |= E1000_RXD_STAT_ACK;
> > - trace_e1000e_rx_metadata_ack();
> > - }
> > -
> > - if (pkt_info) {
> > - *pkt_info = rss_info->enabled ? rss_info->type : 0;
> > -
> > - if (etqf < 8) {
> > - *pkt_info |= BIT(11) | (etqf << 4);
> > - } else {
> > - if (hasip4) {
> > - *pkt_info |= E1000_ADVRXD_PKT_IP4;
> > - }
> > -
> > - if (hasip6) {
> > - *pkt_info |= E1000_ADVRXD_PKT_IP6;
> > - }
> > -
> > - switch (l4hdr_proto) {
> > - case ETH_L4_HDR_PROTO_TCP:
> > - *pkt_info |= E1000_ADVRXD_PKT_TCP;
> > - break;
> > -
> > - case ETH_L4_HDR_PROTO_UDP:
> > - *pkt_info |= E1000_ADVRXD_PKT_UDP;
> > - break;
> > -
> > - case ETH_L4_HDR_PROTO_SCTP:
> > - *pkt_info |= E1000_ADVRXD_PKT_SCTP;
> > - break;
> > -
> > - default:
> > - break;
> > - }
> > - }
> > - }
> > -
> > - if (hdr_info) {
> > - *hdr_info = 0;
> > - }
> > -
> > - if (ts) {
> > - *status_flags |= BIT(16);
> > - }
> > -
> > /* RX CSO information */
> > if (hasip6 && (core->mac[RFCTL] & E1000_RFCTL_IPV6_XSUM_DIS)) {
> > trace_e1000e_rx_metadata_ipv6_sum_disabled();
> > @@ -1426,58 +1390,125 @@ func_exit:
> > }
> > static inline void
> > -igb_write_lgcy_rx_descr(IGBCore *core, struct e1000_rx_desc *desc,
> > +igb_write_lgcy_rx_descr(IGBCore *core,
> > + struct e1000_rx_desc *d,
>
> Why renaming desc to d?
>
> > struct NetRxPkt *pkt,
> > - const E1000E_RSSInfo *rss_info, uint16_t etqf,
> > bool ts,
> > + const E1000E_RSSInfo *rss_info,
> > uint16_t length)
> > {
> > - uint32_t status_flags, rss;
> > - uint16_t ip_id;
> > + uint32_t status_flags;
> > assert(!rss_info->enabled);
> > - desc->length = cpu_to_le16(length);
> > - desc->csum = 0;
> > - igb_build_rx_metadata(core, pkt, pkt != NULL,
> > - rss_info, etqf, ts,
> > - NULL, NULL, &rss,
> > - &status_flags, &ip_id,
> > - &desc->special);
> > - desc->errors = (uint8_t) (le32_to_cpu(status_flags) >> 24);
> > - desc->status = (uint8_t) le32_to_cpu(status_flags);
> > + memset(d, 0, sizeof(*d));
> > + d->length = cpu_to_le16(length);
> > + igb_build_rx_metadata_common(core, pkt, pkt != NULL,
> > + &status_flags,
> > + &d->special);
> > +
> > + d->errors = (uint8_t) (le32_to_cpu(status_flags) >> 24);
> > + d->status = (uint8_t) le32_to_cpu(status_flags);
> > +}
> > +
> > +static uint16_t
> > +igb_rx_desc_get_packet_type(IGBCore *core, struct NetRxPkt *pkt, uint16_t
> > etqf)
> > +{
> > + uint16_t pkt_type = 0;
> > + bool hasip4, hasip6;
> > + EthL4HdrProto l4hdr_proto;
> > +
> > + net_rx_pkt_get_protocols(pkt, &hasip4, &hasip6, &l4hdr_proto);
> > +
> > + if (hasip6 && !(core->mac[RFCTL] & E1000_RFCTL_IPV6_DIS)) {
> > + eth_ip6_hdr_info *ip6hdr_info = net_rx_pkt_get_ip6_info(pkt);
> > + pkt_type |= ip6hdr_info->has_ext_hdrs ? E1000_ADVRXD_PKT_IP6E :
> > + E1000_ADVRXD_PKT_IP6;
> > + } else if (hasip4) {
> > + pkt_type = E1000_ADVRXD_PKT_IP4;
> > + }
> > +
> > + if (etqf < 8) {
> > + pkt_type |= (BIT(11) >> 4) | etqf;
> > + return pkt_type;
> > + }
> > +
> > + switch (l4hdr_proto) {
> > + case ETH_L4_HDR_PROTO_TCP:
> > + pkt_type |= E1000_ADVRXD_PKT_TCP;
> > + break;
> > + case ETH_L4_HDR_PROTO_UDP:
> > + pkt_type |= E1000_ADVRXD_PKT_UDP;
> > + break;
> > + case ETH_L4_HDR_PROTO_SCTP:
> > + pkt_type |= E1000_ADVRXD_PKT_SCTP;
> > + break;
> > + default:
> > + break;
> > + }
> > +
> > + return pkt_type;
> > }
> > static inline void
> > -igb_write_adv_rx_descr(IGBCore *core, union e1000_adv_rx_desc *desc,
> > +igb_write_adv_rx_descr(IGBCore *core,
> > + union e1000_adv_rx_desc *d,
> > struct NetRxPkt *pkt,
> > - const E1000E_RSSInfo *rss_info, uint16_t etqf, bool
> > ts,
> > + const E1000E_RSSInfo *rss_info,
> > + uint16_t etqf,
> > + bool ts,
> > uint16_t length)
> > {
> > - memset(&desc->wb, 0, sizeof(desc->wb));
> > + bool hasip4, hasip6;
> > + EthL4HdrProto l4hdr_proto;
> > + uint16_t rss_type = 0, pkt_type;
> > + bool eop = (pkt != NULL);
> > + memset(&d->wb, 0, sizeof(d->wb));
> > +
> > + d->wb.upper.length = cpu_to_le16(length);
> > + igb_build_rx_metadata_common(core, pkt, eop,
> > + &d->wb.upper.status_error,
> > + &d->wb.upper.vlan);
> > +
> > + if (!eop) {
> > + return;
> > + }
> > +
> > + net_rx_pkt_get_protocols(pkt, &hasip4, &hasip6, &l4hdr_proto);
> > - desc->wb.upper.length = cpu_to_le16(length);
> > + if ((core->mac[RXCSUM] & E1000_RXCSUM_PCSD) && rss_info->enabled) {
>
> I think the older style better described that RSS and checksumming is
> mutally exclusive.
>
> > + d->wb.lower.hi_dword.rss = cpu_to_le32(rss_info->hash);
> > + rss_type = rss_info->type;
> > + trace_igb_rx_metadata_rss(d->wb.lower.hi_dword.rss, rss_type);
> > + } else if (!(core->mac[RXCSUM] & E1000_RXCSUM_PCSD) &&
> > + core->mac[RXCSUM] & E1000_RXCSUM_IPPCSE &&
> > + hasip4) {
> > + d->wb.lower.hi_dword.csum_ip.ip_id =
> > cpu_to_le16(net_rx_pkt_get_ip_id(pkt));
> > + trace_e1000e_rx_metadata_ip_id(d->wb.lower.hi_dword.csum_ip.ip_id);
> > + }
> > - igb_build_rx_metadata(core, pkt, pkt != NULL,
> > - rss_info, etqf, ts,
> > - &desc->wb.lower.lo_dword.pkt_info,
> > - &desc->wb.lower.lo_dword.hdr_info,
> > - &desc->wb.lower.hi_dword.rss,
> > - &desc->wb.upper.status_error,
> > - &desc->wb.lower.hi_dword.csum_ip.ip_id,
> > - &desc->wb.upper.vlan);
> > + if (ts) {
> > + d->wb.upper.status_error |= BIT(16);
> > + }
> > +
> > + pkt_type = igb_rx_desc_get_packet_type(core, pkt, etqf);
> > + trace_e1000e_rx_metadata_pkt_type(pkt_type);
> > + d->wb.lower.lo_dword.pkt_info = cpu_to_le16(rss_type | (pkt_type <<
> > 4));
> > }
> > static inline void
> > -igb_write_rx_descr(IGBCore *core, union e1000_rx_desc_union *desc,
> > - struct NetRxPkt *pkt, const E1000E_RSSInfo *rss_info,
> > - uint16_t etqf, bool ts, uint16_t length)
> > +igb_write_rx_descr(IGBCore *core,
> > + union e1000_rx_desc_union *desc,
> > + struct NetRxPkt *pkt,
> > + const E1000E_RSSInfo *rss_info,
> > + uint16_t etqf,
> > + bool ts,
> > + uint16_t(*written)[MAX_PS_BUFFERS],
> > + const E1000E_RingInfo *r)
> > {
> > if (igb_rx_use_legacy_descriptor(core)) {
> > - igb_write_lgcy_rx_descr(core, &desc->legacy, pkt, rss_info,
> > - etqf, ts, length);
> > + igb_write_lgcy_rx_descr(core, &desc->legacy, pkt, rss_info,
> > (*written)[1]);
> > } else {
> > - igb_write_adv_rx_descr(core, &desc->adv, pkt, rss_info,
> > - etqf, ts, length);
> > + igb_write_adv_rx_descr(core, &desc->adv, pkt, rss_info, etqf, ts,
> > (*written)[1]);
> > }
> > }
> > @@ -1513,19 +1544,6 @@ igb_pci_dma_write_rx_desc(IGBCore *core, PCIDevice
> > *dev, dma_addr_t addr,
> > }
> > }
> > -static void
> > -igb_write_to_rx_buffers(IGBCore *core,
> > - PCIDevice *d,
> > - hwaddr ba,
> > - uint16_t *written,
> > - const char *data,
> > - dma_addr_t data_len)
> > -{
> > - trace_igb_rx_desc_buff_write(ba, *written, data, data_len);
> > - pci_dma_write(d, ba + *written, data, data_len);
> > - *written += data_len;
> > -}
> > -
> > static void
> > igb_update_rx_stats(IGBCore *core, const E1000E_RingInfo *rxi,
> > size_t pkt_size, size_t pkt_fcs_size)
> > @@ -1551,6 +1569,136 @@ igb_rx_descr_threshold_hit(IGBCore *core, const
> > E1000E_RingInfo *rxi)
> > ((core->mac[E1000_SRRCTL(rxi->idx) >> 2] >> 20) & 31) * 16;
> > }
> > +typedef struct igb_ba_state_st {
> > + uint16_t written[MAX_PS_BUFFERS];
> > + uint8_t cur_idx;
> > +} igb_ba_state;
> > +
> > +typedef struct {
> > + size_t size;
> > + size_t total_size;
> > + size_t ps_hdr_len;
> > + size_t desc_size;
> > + size_t desc_offset;
> > + uint32_t rx_desc_packet_buf_size;
> > + uint32_t rx_desc_header_buf_size;
> > + struct iovec *iov;
> > + size_t iov_ofs;
> > + bool is_first;
> > + igb_ba_state bastate;
> > + hwaddr ba[MAX_PS_BUFFERS];
> > +} igb_packet_tx_dma_state;
>
> Follow the convention described in docs/devel/style.rst for new typedefs.
>
> Also, it says tx but it's used for rx.
>
> > +
> > +static void
> > +igb_truncate_to_descriptor_size(igb_packet_tx_dma_state *pdma_st, size_t
> > *size)
> > +{
> > + if (*size > pdma_st->rx_desc_packet_buf_size) {
> > + *size = pdma_st->rx_desc_packet_buf_size;
> > + }
> > +}
> > +
> > +static void
> > +igb_write_payload_to_rx_buffers(IGBCore *core,
> > + PCIDevice *d,
> > + hwaddr (*ba)[MAX_PS_BUFFERS],
>
>
> > + igb_ba_state *bastate,
> > + uint32_t cur_buf_len,
> > + const char *data,
> > + dma_addr_t data_len)
> > +{
> > + while (data_len > 0) {
> > + assert(bastate->cur_idx < MAX_PS_BUFFERS);
> > +
> > + uint32_t cur_buf_bytes_left = cur_buf_len -
> > + bastate->written[bastate->cur_idx];
> > + uint32_t bytes_to_write = MIN(data_len, cur_buf_bytes_left);
> > +
> > + trace_igb_rx_desc_buff_write(bastate->cur_idx,
> > + (*ba)[bastate->cur_idx],
> > + bastate->written[bastate->cur_idx],
> > + data,
> > + bytes_to_write);
> > +
> > + pci_dma_write(d,
> > + (*ba)[bastate->cur_idx] +
> > + bastate->written[bastate->cur_idx],
> > + data, bytes_to_write);
> > +
> > + bastate->written[bastate->cur_idx] += bytes_to_write;
> > + data += bytes_to_write;
> > + data_len -= bytes_to_write;
> > +
> > + if (bastate->written[bastate->cur_idx] == cur_buf_len) {
> > + bastate->cur_idx++;
> > + }
> > + }
> > +}
> > +
> > +static void
> > +igb_write_packet_payload_to_descr_addr(IGBCore *core,
>
> The names of igb_write_payload_to_rx_buffers() and
> igb_write_packet_payload_to_descr_addr() don't disambiguate themselves.
> Since igb_write_payload_to_rx_buffers() only writes a framgent of the
> payload, you may rename it to igb_write_payload_fragment_to_rx_buffers(),
> and rename igb_write_packet_payload_to_descr_addr() to
> igb_write_payload_to_rx_buffers().
>
> > + struct NetRxPkt *pkt,
> > + PCIDevice *d,
> > + igb_packet_tx_dma_state *pdma_st,
> > + size_t *copy_size)
> > +{
> > + static const uint32_t fcs_pad;
> > + size_t iov_copy;
> > +
> > + /* Copy packet payload */
> > + while (*copy_size) {
> > + iov_copy = MIN(*copy_size, pdma_st->iov->iov_len -
> > pdma_st->iov_ofs);
> > + igb_write_payload_to_rx_buffers(core, d,
> > + &pdma_st->ba,
> > + &pdma_st->bastate,
> > + pdma_st->rx_desc_packet_buf_size,
> > + pdma_st->iov->iov_base +
> > pdma_st->iov_ofs,
> > + iov_copy);
> > +
> > + *copy_size -= iov_copy;
> > + pdma_st->iov_ofs += iov_copy;
> > + if (pdma_st->iov_ofs == pdma_st->iov->iov_len) {
> > + pdma_st->iov++;
> > + pdma_st->iov_ofs = 0;
> > + }
> > + }
> > +
> > + if (pdma_st->desc_offset + pdma_st->desc_size >= pdma_st->total_size) {
> > + /* Simulate FCS checksum presence in the last descriptor */
> > + igb_write_payload_to_rx_buffers(core, d,
> > + &pdma_st->ba,
> > + &pdma_st->bastate,
> > + pdma_st->rx_desc_packet_buf_size,
> > + (const char *) &fcs_pad,
> > + e1000x_fcs_len(core->mac));
> > + }
> > +}
> > +
> > +static void
> > +igb_write_to_rx_buffers(IGBCore *core,
> > + struct NetRxPkt *pkt,
> > + PCIDevice *d,
> > + igb_packet_tx_dma_state *pdma_st)
> > +{
> > + size_t copy_size;
> > +
> > + if (!(pdma_st->ba)[1]) {
> > + /* as per intel docs; skip descriptors with null buf addr */
> > + trace_e1000e_rx_null_descriptor();
> > + return;
> > + }
> > +
> > + if (pdma_st->desc_offset >= pdma_st->size) {
> > + return;
> > + }
> > +
> > + pdma_st->desc_size = pdma_st->total_size - pdma_st->desc_offset;
> > + igb_truncate_to_descriptor_size(pdma_st, &pdma_st->desc_size);
> > + copy_size = pdma_st->size - pdma_st->desc_offset;
> > + igb_truncate_to_descriptor_size(pdma_st, ©_size);
> > + pdma_st->bastate.cur_idx = 1;
> > + igb_write_packet_payload_to_descr_addr(core, pkt, d, pdma_st,
> > ©_size);
> > +}
> > +
> > static void
> > igb_write_packet_to_guest(IGBCore *core, struct NetRxPkt *pkt,
> > const E1000E_RxRing *rxr,
> > @@ -1560,91 +1708,58 @@ igb_write_packet_to_guest(IGBCore *core, struct
> > NetRxPkt *pkt,
> > PCIDevice *d;
> > dma_addr_t base;
> > union e1000_rx_desc_union desc;
> > - size_t desc_size;
> > - size_t desc_offset = 0;
> > - size_t iov_ofs = 0;
> > -
> > - struct iovec *iov = net_rx_pkt_get_iovec(pkt);
> > - size_t size = net_rx_pkt_get_total_len(pkt);
> > - size_t total_size = size + e1000x_fcs_len(core->mac);
> > - const E1000E_RingInfo *rxi = rxr->i;
> > - size_t bufsize = igb_rxbufsize(core, rxi);
> > -
> > + const E1000E_RingInfo *rxi;
> > + size_t rx_desc_len;
> > +
> > + igb_packet_tx_dma_state pdma_st = {0};
> > + pdma_st.is_first = true;
> > + pdma_st.size = net_rx_pkt_get_total_len(pkt);
> > + pdma_st.total_size = pdma_st.size + e1000x_fcs_len(core->mac);
> > +
> > + rxi = rxr->i;
> > + rx_desc_len = core->rx_desc_len;
> > + pdma_st.rx_desc_packet_buf_size =
> > + igb_rxbufsize(core, rxi);
> > + pdma_st.rx_desc_header_buf_size =
> > + igb_get_queue_rx_header_buf_size(core, rxi);
> > + pdma_st.iov = net_rx_pkt_get_iovec(pkt);
> > d = pcie_sriov_get_vf_at_index(core->owner, rxi->idx % 8);
> > if (!d) {
> > d = core->owner;
> > }
> > do {
> > - hwaddr ba;
> > - uint16_t written = 0;
> > + memset(&pdma_st.bastate, 0, sizeof(igb_ba_state));
> > bool is_last = false;
> > - desc_size = total_size - desc_offset;
> > -
> > - if (desc_size > bufsize) {
> > - desc_size = bufsize;
> > - }
> > -
> > if (igb_ring_empty(core, rxi)) {
> > return;
> > }
> > base = igb_ring_head_descr(core, rxi);
> > + pci_dma_read(d, base, &desc, rx_desc_len);
> > + trace_e1000e_rx_descr(rxi->idx, base, rx_desc_len);
> > - pci_dma_read(d, base, &desc, core->rx_desc_len);
> > -
> > - trace_e1000e_rx_descr(rxi->idx, base, core->rx_desc_len);
> > -
> > - igb_read_rx_descr(core, &desc, &ba);
> > -
> > - if (ba) {
> > - if (desc_offset < size) {
> > - static const uint32_t fcs_pad;
> > - size_t iov_copy;
> > - size_t copy_size = size - desc_offset;
> > - if (copy_size > bufsize) {
> > - copy_size = bufsize;
> > - }
> > -
> > - /* Copy packet payload */
> > - while (copy_size) {
> > - iov_copy = MIN(copy_size, iov->iov_len - iov_ofs);
> > -
> > - igb_write_to_rx_buffers(core, d, ba, &written,
> > - iov->iov_base + iov_ofs,
> > iov_copy);
> > + igb_read_rx_descr(core, &desc, pdma_st.ba, rxi);
> > - copy_size -= iov_copy;
> > - iov_ofs += iov_copy;
> > - if (iov_ofs == iov->iov_len) {
> > - iov++;
> > - iov_ofs = 0;
> > - }
> > - }
> > -
> > - if (desc_offset + desc_size >= total_size) {
> > - /* Simulate FCS checksum presence in the last
> > descriptor */
> > - igb_write_to_rx_buffers(core, d, ba, &written,
> > - (const char *) &fcs_pad,
> > e1000x_fcs_len(core->mac));
> > - }
> > - }
> > - } else { /* as per intel docs; skip descriptors with null buf addr
> > */
> > - trace_e1000e_rx_null_descriptor();
> > - }
> > - desc_offset += desc_size;
> > - if (desc_offset >= total_size) {
> > + igb_write_to_rx_buffers(core, pkt, d, &pdma_st);
> > + pdma_st.desc_offset += pdma_st.desc_size;
> > + if (pdma_st.desc_offset >= pdma_st.total_size) {
> > is_last = true;
> > }
> > - igb_write_rx_descr(core, &desc, is_last ? core->rx_pkt : NULL,
> > - rss_info, etqf, ts, written);
> > - igb_pci_dma_write_rx_desc(core, d, base, &desc, core->rx_desc_len);
> > -
> > - igb_ring_advance(core, rxi, core->rx_desc_len /
> > E1000_MIN_RX_DESC_LEN);
> > -
> > - } while (desc_offset < total_size);
> > -
> > - igb_update_rx_stats(core, rxi, size, total_size);
> > + igb_write_rx_descr(core, &desc,
> > + is_last ? pkt : NULL,
> > + rss_info,
> > + etqf, ts,
> > + &pdma_st.bastate.written,
> > + rxi);
> > + pci_dma_write(d, base, &desc, rx_desc_len);
> > + igb_ring_advance(core, rxi,
> > + rx_desc_len / E1000_MIN_RX_DESC_LEN);
> > + } while (pdma_st.desc_offset < pdma_st.total_size);
> > +
> > + igb_update_rx_stats(core, rxi, pdma_st.size, pdma_st.total_size);
> > }
> > static bool
> > diff --git a/hw/net/igb_regs.h b/hw/net/igb_regs.h
> > index 82ff195dfc..b14ca834ad 100644
> > --- a/hw/net/igb_regs.h
> > +++ b/hw/net/igb_regs.h
> > @@ -76,6 +76,15 @@ union e1000_adv_rx_desc {
> > } wb; /* writeback */
> > };
> > +#define IGB_MAX_PS_BUFFERS 2
> > +#define IGB_MAX_RX_DESC_LEN (sizeof(uint64_t) * MAX_PS_BUFFERS)
> > +
> > +#define RX_DESC_ADV_HDR_LEN_OFFSET (21 - 16)
> > +#define RX_DESC_ADV_HDR_LEN_MASK ((BIT(10) - 1) << \
> > + RX_DESC_ADV_HDR_LEN_OFFSET)
> > +#define RX_DESC_ADV_HDR_SPH BIT(15)
> > +#define RX_DESC_ADV_ST_ERR_HBO_OFFSET BIT(3 + 20)
> > +
>
> These should be added afer /* new */
>
> And use the name ADVRXD to denote the advanced Rx descriptor to make it
> consistent with ADVTXD.
>
> > /* from igb/e1000_phy.h */
> > /* IGP01E1000 Specific Registers */
> > @@ -452,6 +461,7 @@ union e1000_adv_rx_desc {
> > #define E1000_SRRCTL_BSIZEHDRSIZE_MASK 0x00000F00
> > #define E1000_SRRCTL_BSIZEHDRSIZE_SHIFT 2 /* Shift _left_ */
> > #define E1000_SRRCTL_DESCTYPE_ADV_ONEBUF 0x02000000
> > +#define E1000_SRRCTL_DESCTYPE_HDR_SPLIT 0x04000000
> > #define E1000_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS 0x0A000000
> > #define E1000_SRRCTL_DESCTYPE_MASK 0x0E000000
> > #define E1000_SRRCTL_DROP_EN 0x80000000
> > @@ -692,11 +702,12 @@ union e1000_adv_rx_desc {
> > #define E1000_STATUS_NUM_VFS_SHIFT 14
> > -#define E1000_ADVRXD_PKT_IP4 BIT(4)
> > -#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)
> > +#define E1000_ADVRXD_PKT_IP4 BIT(0)
> > +#define E1000_ADVRXD_PKT_IP6 BIT(2)
> > +#define E1000_ADVRXD_PKT_IP6E BIT(3)
> > +#define E1000_ADVRXD_PKT_TCP BIT(4)
> > +#define E1000_ADVRXD_PKT_UDP BIT(5)
> > +#define E1000_ADVRXD_PKT_SCTP BIT(6)
> > static inline uint8_t igb_ivar_entry_rx(uint8_t i)
> > {
> > diff --git a/hw/net/trace-events b/hw/net/trace-events
> > index e4a98b2c7d..9a02261360 100644
> > --- a/hw/net/trace-events
> > +++ b/hw/net/trace-events
> > @@ -277,9 +277,9 @@ igb_core_mdic_write_unhandled(uint32_t addr) "MDIC
> > WRITE: PHY[%u] UNHANDLED"
> > igb_link_set_ext_params(bool asd_check, bool speed_select_bypass, bool
> > pfrstd) "Set extended link params: ASD check: %d, Speed select bypass: %d,
> > PF reset done: %d"
> > igb_rx_desc_buff_size(uint32_t b) "buffer size: %u"
> > -igb_rx_desc_buff_write(uint64_t addr, uint16_t offset, const void* source,
> > uint32_t len) "addr: 0x%"PRIx64", offset: %u, from: %p, length: %u"
> > +igb_rx_desc_buff_write(uint8_t idx, uint64_t addr, uint16_t offset, const
> > void* source, uint32_t len) "buffer #%u, addr: 0x%"PRIx64", offset: %u,
> > from: %p, length: %u"
> > -igb_rx_metadata_rss(uint32_t rss) "RSS data: 0x%X"
> > +igb_rx_metadata_rss(uint32_t rss, uint16_t rss_pkt_type) "RSS data: rss:
> > 0x%X, rss_pkt_type: 0x%X"
> > igb_irq_icr_clear_gpie_nsicr(void) "Clearing ICR on read due to
> > GPIE.NSICR enabled"
> > igb_irq_set_iam(uint32_t icr) "Update IAM: 0x%x"
> > @@ -294,6 +294,8 @@ igb_irq_eitr_set(uint32_t eitr_num, uint32_t val)
> > "EITR[%u] = 0x%x"
> > igb_set_pfmailbox(uint32_t vf_num, uint32_t val) "PFMailbox[%d]: 0x%x"
> > igb_set_vfmailbox(uint32_t vf_num, uint32_t val) "VFMailbox[%d]: 0x%x"
> > +igb_wrn_rx_desc_modes_not_supp(int desc_type) "Not supported descriptor
> > type: %d"
> > +
> > # igbvf.c
> > igbvf_wrn_io_addr_unknown(uint64_t addr) "IO unknown register 0x%"PRIx64
> > diff --git a/tests/qtest/libqos/igb.c b/tests/qtest/libqos/igb.c
> > index a603468beb..4e720ee7e7 100644
> > --- a/tests/qtest/libqos/igb.c
> > +++ b/tests/qtest/libqos/igb.c
> > @@ -55,6 +55,7 @@ static void igb_pci_start_hw(QOSGraphObject *obj)
> > {
> > static const uint8_t address[] = E1000E_ADDRESS;
> > QE1000E_PCI *d = (QE1000E_PCI *) obj;
> > + uint32_t srrctl0;
> > uint32_t val;
> > /* Enable the device */
> > @@ -109,6 +110,10 @@ static void igb_pci_start_hw(QOSGraphObject *obj)
> > E1000_RAH_AV | E1000_RAH_POOL_1 |
> > le16_to_cpu(*(uint16_t *)(address + 4)));
> > + /* Set supported receive descriptor mode */
> > + srrctl0 = e1000e_macreg_read(&d->e1000e, E1000_SRRCTL(0));
> > + e1000e_macreg_write(&d->e1000e, E1000_SRRCTL(0), srrctl0 | BIT(25));
>
> As I wrote in previous review:
> > You don't need to read the initial value. The Linux driver also
> > doesn't do that.
> >
> > Also use: E1000_SRRCTL_DESCTYPE_ADV_ONEBUF
>
> > +
> > /* Enable receive */
> > e1000e_macreg_write(&d->e1000e, E1000_RFCTL, E1000_RFCTL_EXTEN);
> > e1000e_macreg_write(&d->e1000e, E1000_RCTL, E1000_RCTL_EN);
>