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<203d7186.13d6.199b3a225b3.Coremail.bloodyevil@163.com> From: Stephen Hemminger Date: Mon, 6 Oct 2025 14:47:54 +0200 X-Gm-Features: AS18NWAH9KwyKdiaJgSacdVuxS8mTi5GNOnHqbN5ndvbuZGewCgtiY4xVM3u1y4 Message-ID: Subject: =?UTF-8?B?UmU6IFtVUkdFTlRdIENyaXRpY2FsIElzc3VlOiBDaGVsc2lvIE5JQyAoY3hnYmUpIGZhaQ==?= =?UTF-8?B?bHMgdG8gc2VuZCBaZXJvLUNvcHkgcGFja2V0cyBhbmQgcHJvdmlkZXMgaW5jb21wbGV0ZSBIVyBvZmZs?= =?UTF-8?B?b2FkIGluIERQREsg44CQ57Sn5oCl5oqA5pyv6Zeu6aKY44CRQ2hlbHNpbyDnvZHljaEgKGN4Z2JlKSA=?= =?UTF-8?B?5ZyoIERQREsg5Lit5peg5rOV5Y+R6YCB6Zu25ou36LSd5YiG54mH5YyF5LiU56Gs5Lu25Y246L295Yqf?= =?UTF-8?B?6IO95LiN5a6M5pW0?= To: bloodyevil Cc: dev Content-Type: multipart/alternative; boundary="000000000000c4b91a06407cdcca" X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org --000000000000c4b91a06407cdcca Content-Type: text/plain; charset="UTF-8" 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Please put this in a bugzilla report.

On Mon, Oct 6, 2025, 12:00 bloodyevil <bloodyevil@163.com> wrote:

Dear DPDK Development Team and Chelsio Support Team,

We are writing to report two = severe, fundamental issues we've encountered while using Chelsio T5/T6 = series NICs (with the=C2=A0cxgbe=C2=A0PMD) in our high-performance real-time audio= streaming application. These problems prevent us from leveraging core DPDK= features and require your urgent attention.

Issue #1:= Complete Failure to Transmit Zero-Copy (Multi-Segment) Packets

To achieve the lowest latency, we are us= ing the standard DPDK zero-copy mechanism: attaching an external shared mem= ory buffer (from=C2=A0rte_memzone) containing our audio payload to an mbuf header using= =C2=A0rte_pktmbuf_atta= ch_extbuf. This correctly creates a=C2=A0multi-segment mbuf=C2=A0(nb_segs > 1).

However, we have found that the=C2=A0cxgbe=C2=A0driver is completely unable to transmit these= multi-segment mbufs. Any attempt to send such a packet via=C2=A0rte_eth_tx_burst=C2=A0fails (returns 0 or results in silent packet drops), regardless of wheth= er hardware offloads are enabled or disabled. The=C2=A0= cxgbe=C2=A0PMD's capabi= lity report (tx_offload_capa<= /span>) cor= rectly=C2=A0do= es not include=C2=A0the=C2=A0RTE_ETH_TX_OFFLOAD_MULTI_SEGS=C2=A0flag.

This means that for the=C2=A0cxgbe=C2=A0driver= , the standard zero-copy path in DPDK is entirely non-functional.

Issue #2: Incomplete Hardware Checksum Offload<= /p>

Forced to abandon zero-copy, we implemented a= "single-copy" workaround by using=C2=A0rte_memcpy=C2=A0to create a cont= iguous, single-segment mbuf. While this allows packets to be transmitted, w= e discovered a second critical issue:=C2=A0the hardware checksum offload functionality is= incomplete.

Specifically:

  • We set the full = offload flags on the mbuf:=C2=A0m->ol_flags |=3D RTE_MBUF_F_TX_IPV4 | RTE_MBUF_F_TX_IP_C= KSUM | RTE_MBUF_F_TX_UDP_CKSUM;.

  • We zero out bot= h the IP and UDP checksum fields in their respective headers before transmi= ssion.

  • Packet captures reveal that only the<= span>=C2=A0UDP check= sum=C2=A0is correctly calculated and filled in by the hardware. = The=C2=A0IP ch= ecksum=C2=A0field remains zeroed, causing the packet to be treat= ed as invalid and dropped by the network.

  • Fo= r the packet to be transmitted successfully, we are forced to=C2=A0manually calculate the= IP checksum in software=C2=A0(ip_h->hdr_checksum =3D rte_ipv4_cksum(ip_h);<= span style=3D"white-space:normal;word-break:break-word">) while keeping the= UDP checksum field zeroed for hardware offload.

    • This proves that although the=C2=A0cxgbe=C2=A0PMD reports sup= port for=C2=A0RT= E_ETH_TX_OFFLOAD_IPV4_CKSUM, it=C2=A0does not actually perform IP checksum offloading<= /strong>=C2= =A0in practice.

    For contrast, w= e must emphasize that both of the core functionalities we've described= =E2=80=94zero-copy (multi-segment mbuf) transmission and full (IP+UDP) hard= ware checksum offloading=E2=80=94work perfectly on the same testbed when us= ing NICs from Intel (igc/i40e) and onboard Realtek(RTL8125) controllers. Th= is strongly suggests that the issues are specific to the Chelsio cxgbe PMD.=

    Our Dilemma

    These two issues leave us in an untenable position:

    • The ideal=C2=A0= zero-copy path is co= mpletely broken, preventing us from realizing a primary performance benefit o= f DPDK.

    • The fallback=C2=A0single-copy path is highly ineff= icient, as it not only incurs the CPU cost of a=C2=A0memcpy=C2=A0but also requires t= he additional CPU overhead of software IP checksum calculation, largely def= eating the purpose of hardware offloads.

    Our= Questions

    = We urgently need y= our help to clarify the following:

      • Is thi= s behavior from the cxgbe PMD (offlo= ading only UDP checksum) consistent with the design expectations for a PMD = in DPDK?

      • Does the DPDK framework provide any de= bugging mechanisms to trace why an explicitly set offload flag (RTE_MBUF_F_TX_IP_CKSUM) would be ignored by a P= MD without reporting an error?


    Resolving these issues is cri= tical to the success of our project. Any information or guidance you can pr= ovide would be greatly appreciated.

    Our Envir= onment

    • DPDK Version:=C2=A025.07

    • NIC Model:=C2=A0Chelsio T520-CR=

    • OS & Kernel:=C2=A0Tinycore64 16.0 kernel 6.6.63

    Thank you for your time and= attention to this urgent matter. We look forward to your response.<= /p>

    Best regards,




    =E5= =B0=8A=E6=95=AC=E7=9A=84 DPDK =E5=BC=80=E5=8F=91=E5=9B=A2=E9=98=9F=E5=92=8C= Chelsio =E6=8A=80=E6=9C=AF=E6=94=AF=E6=8C=81=E5=9B=A2=E9=98=9F=EF=BC=9A

    =E6=82=A8=E4=BB=AC=E5= =A5=BD=EF=BC=81

    =E6=88=91=E4= =BB=AC=E6=AD=A3=E5=9C=A8=E5=BC=80=E5=8F=91=E4=B8=80=E4=B8=AA=E5=AF=B9=E6=80= =A7=E8=83=BD=E8=A6=81=E6=B1=82=E6=9E=81=E9=AB=98=E7=9A=84=E5=AE=9E=E6=97=B6= =E9=9F=B3=E9=A2=91=E6=B5=81=E9=A1=B9=E7=9B=AE=EF=BC=8C=E4=BD=86=E7=9B=AE=E5= =89=8D=E5=9C=A8=E4=BD=BF=E7=94=A8 Chelsio T5/T6 =E7=B3=BB=E5=88=97=E7=BD=91= =E5=8D=A1=EF=BC=88cxgbe=C2= =A0PMD=EF=BC=89=E6=97=B6=EF=BC=8C=E9=81=87=E5=88=B0=E4=BA=86=E4=B8= =A4=E4=B8=AA=E4=B8=A5=E9=87=8D=E7=9A=84=E5=BA=95=E5=B1=82=E5=8A=9F=E8=83=BD= =E9=9A=9C=E7=A2=8D=EF=BC=8C=E5=AF=BC=E8=87=B4 DPDK =E7=9A=84=E6=A0=B8=E5=BF= =83=E4=BC=98=E5=8A=BF=E6=97=A0=E6=B3=95=E5=8F=91=E6=8C=A5=E3=80=82=E6=88=91= =E4=BB=AC=E6=81=B3=E8=AF=B7=E6=82=A8=E4=BB=AC=E7=9A=84=E7=B4=A7=E6=80=A5=E6= =8F=B4=E5=8A=A9=E3=80=82

    =E3=80=90=E6=A0=B8= =E5=BF=83=E9=97=AE=E9=A2=98=E4=B8=80=EF=BC=9A=E9=9B=B6=E6=8B=B7=E8=B4=9D=EF= =BC=88=E5=A4=9A=E6=AE=B5 mbuf=EF=BC=89=E6=95=B0=E6=8D=AE=E5=8C=85=E5=AE=8C= =E5=85=A8=E6=97=A0=E6=B3=95=E5=8F=91=E9=80=81=E3=80=91

    <= p style=3D"white-space:normal;word-break:break-word">=E4=B8=BA=E4=BA=86=E5=AE=9E=E7=8E=B0=E6= =9C=80=E4=BD=8E=E5=BB=B6=E8=BF=9F=EF=BC=8C=E6=88=91=E4=BB=AC=E9=87=87=E7=94= =A8 DPDK =E6=A0=87=E5=87=86=E7=9A=84=E9=9B=B6=E6=8B=B7=E8=B4=9D=E6=9C=BA=E5= =88=B6=EF=BC=9A=E9=80=9A=E8=BF=87=C2=A0rte_pktmbuf_attach_extbuf=C2=A0=E5=87=BD= =E6=95=B0=EF=BC=8C=E5=B0=86=E5=A4=96=E9=83=A8=E5=85=B1=E4=BA=AB=E5=86=85=E5= =AD=98=EF=BC=88rte_memzone=EF=BC= =89=E4=B8=AD=E7=9A=84=E9=9F=B3=E9=A2=91=E6=95=B0=E6=8D=AE=E9=99=84=E5=8A=A0= =E5=88=B0 mbuf =E5=A4=B4=E9=83=A8=E4=B9=8B=E5=90=8E=E3=80=82=E6=AD=A4=E6=93= =8D=E4=BD=9C=E4=BC=9A=E5=88=9B=E5=BB=BA=E4=B8=80=E4=B8=AA=E5=A4=9A=E6=AE=B5 mbuf=C2=A0(nb_segs > 1)=E3=80=82

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    • DPDK =E7=89=88=E6=9C=AC=EF=BC=9A25.07

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    • =E7=BD=91=E5=8D=A1=E5=9E=8B=E5=8F=B7=EF=BC=9AChelsio T520-CR

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