fa5045467b
igor: - Fix typos. - Delete trailing whitespace. manlint: - Use .Fo/.Fc/.Fa when describing functions. - Use .Xr. - Fill in SEE ALSO section. - Fix .Dt use: the section was specified incorrectly and the name had a lowercase character. - Continue new sentences on new lines. Miscellaneous: - Remove unnecessary quotes around "SEE ALSO" section headers. - Sprinkle .Dv use in spots with constants. Reported by: igor, make manlint Sponsored by: Dell EMC Isilon
242 lines
7.0 KiB
Groff
242 lines
7.0 KiB
Groff
.\" $FreeBSD$
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.Dd March 23, 2017
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.Dt IFLIBTXTX 9
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.Os
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.Sh NAME
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.Nm iflibtxrx
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.Nd Device Dependent Transmit and Receive Functions
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.Sh SYNOPSIS
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.In "ifdi_if.h"
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.Ss "Interface Manipulation Functions"
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.Ft int
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.Fo isc_txd_encap
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.Fa "void *sc"
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.Fa "if_pkt_into_t pi"
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.Fc
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.Ft void
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.Fo isc_txd_flush
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.Fa "void *sc"
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.Fa "uint16_t qid"
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.Fa "uint32_t _pidx_or_credits_"
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.Fc
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.Ft int *
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.Fo isc_txd_credits_update
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.Fa "void *sc"
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.Fa "uint16_t qid"
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.Fa "uint32_t credits"
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.Fc
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.Ft int *
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.Fo isc_rxd_available
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.Fa "void *sc"
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.Fa "uint16_t qsid"
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.Fa "uint32_t cidx"
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.Fc
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.Ft void *
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.Fo isc_rxd_refill
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.Fa "void *sc"
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.Fa "uint16_t qsid"
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.Fa "uint8_t flid"
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.Fa "uint32_t pidx"
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.Fa "uint64_t *paddrs"
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.Fa "caddr_t *vaddrs"
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.Fa "uint16_t count"
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.Fc
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.Ft void *
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.Fo isc_rxd_flush
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.Fa "void *sc"
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.Fa "uint16_t qsid"
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.Fa "uint8_t flid"
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.Fa "uint32_t pidx"
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.Fc
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.Ft int
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.Fo isc_rxd_pkt_get
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.Fa "void *sc"
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.Fa "if_rxd_info_t ri"
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.Fc
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.Ss "Global Variables"
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.Vt extern struct if_txrx
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.Sh DATA STRUCTURES
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The device dependent mechanisms for handling packet transmit and receive are
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primarily defined by the functions named above.
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The if_pkt_info data structure contains statistics and identifying info
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necessary for packet transmission.
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While the data structure for packet receipt is the if_rxd_info structure.
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.Pp
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.Ss The if_pkt_info Structure
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The fields of
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.Vt "struct if_pkt_info"
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are as follows:
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.Bl -tag -width ".Va if_capabilities" -offset indent
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.It Va ipi_len
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.Pq Vt "uint32_t"
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Denotes the size of packet to be sent on the transmit queue.
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.It Va ipi_segs
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.Pq Vt "bus_dma_segment_t *"
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A pointer to the bus_dma_segment of the device independent transfer queue
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defined in iflib.
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.It Va ipi_qsidx
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Unique index value assigned sequentially to each transmit queue.
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Used to reference the currently transmitting queue.
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.It Va ipi_nsegs
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.Pq Vt "uint16_t"
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Number of descriptors to be read into the device dependent transfer
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descriptors.
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.It Va ipi_ndescs
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.Pq Vt "uint16_t"
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Number of descriptors in use.
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Calculated by subtracting the old pidx value from the new pidx value.
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.It Va ipi_flags
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.Pq Vt "uint16_t"
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Flags defined on a per packet basis.
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.It Va ipi_pidx
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.Pq Vt "uint32_t"
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Value of first pidx sent to the isc_encap function for encapsulation and
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subsequent transmission.
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.It Va ipi_new_pidx
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.Pq Vt "uint32_t"
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Value set after the termination of the isc_encap function.
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This value will become the first pidx sent to the isc-encap the next time that
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the function is called.
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.It Va \fBThe Following Fields Are Used For Offload Handling\fP
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.It Va ipi_csum_flags
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.Pq Vt "uint64_t"
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Flags describing the checksum values, used on a per packet basis.
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.It Va ipi_tso_segsz
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.Pq Vt "uint16_t"
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Size of the TSO Segment Size.
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.It Va ipi_mflags
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.Pq Vt "uint16_t"
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Flags describing the operational parameters of the mbuf.
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.It Va ipi_vtag
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.Pq Vt "uint16_t"
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Contains the VLAN information in the Ethernet Frame.
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.It Va ipi_etype
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.Pq Vt "uint16_t"
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Type of ethernet header protocol as contained by the struct ether_vlan_header.
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.It Va ipi_ehrdlen
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.Pq Vt "uint8_t"
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Length of the Ethernet Header.
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.It Va ipi_ip_hlen
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.Pq Vt "uint8_t"
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Length of the TCP Header
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.It Va ipi_tcp_hlen
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.Pq Vt "uint8_t"
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Length of the TCP Header.
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.It Va ipi_tcp_hflags
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.Pq Vt "uint8_t"
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Flags describing the operational parameters of the TCP Header.
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.It Va ipi_ipproto
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.Pq Vt "uint8_t"
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Specifies the type of IP Protocol in use.
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Example TCP, UDP, or SCTP.
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.El
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.Ss The if_rxd_info Structure
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The fields of
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.Vt "struct if_rxd_info"
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are as follows:
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.Bl -tag -width ".Va if_capabilities" -offset indent
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.It Va iri_qsidx
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.Pq Vt "uint16_t"
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Unique index value assigned sequentially to each receive queue.
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Used to reference the currently receiving queue.
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.It Va iri_vtag
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.Pq Vt "uint16_t"
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Contains the VLAN information in the Ethernet Frame.
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.It Va iri_len
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.Pq Vt "uint16_t"
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Denotes the size of a received packet.
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.It Va iri_next_offset
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.Pq Vt "uint16_t"
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Denotes the offset value for the next packet to be receive.
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A Null value signifies the end of packet.
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.It Va iri_cidx
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.Pq Vt "uint32_t"
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Denotes the index value of the packet currently being processed in the
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consumer queue.
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.It Va iri_flowid
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.Pq Vt "uint32_t"
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Value of the RSS hash for the packet.
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.It Va iri_flags
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.Pq Vt "uint"
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Flags describing the operational parameters of the mbuf contained in the
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receive packet.
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.It Va iri_csum_flags
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.Pq Vt "uint32_t"
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Flags describing the checksum value contained in the receive packet.
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.It Va iri_csum_data
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.Pq Vt "uint32_t"
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Checksum data contained in the
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.Xr mbuf 9
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packet header.
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.It Va iri_m
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.Pq Vt "struct mbuf *"
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A mbuf for drivers that manage their own receive queues.
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.It Va iri_ifp
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.Pq Vt "struct ifnet *"
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A link back to the interface structure.
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Utilized by drivers that have multiple interface per softc.
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.It Va iri_rsstype
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.Pq Vt "uint8_t"
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The value of the RSS hash type.
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.It Va iri_pad
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.Pq Vt "uint8_t"
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The length of any padding contained by the received data.
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.It Va iri_qidx
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.Pq Vt "uint8_t"
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Represents the type of queue event.
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If value >= 0 then it is the freelist id otherwise it is a completion queue
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event.
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.El
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.Sh FUNCTIONS
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All function calls are associated exclusively with either packet transmission
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or receipt.
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The void *sc passed as the first arguement to all of the following functions
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represents the driver's softc.
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.Ss Transmit Packet Functions
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.Bl -ohang -offset indent
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.It Fn isc_txd_encap
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Transmit function that sends a packet on an interface.
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The if_pkt_info data structure contains data information fields describing the
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packet.
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This function returns 0 if successful, otherwise an error value is returned.
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.It Fn isc_txd_flush
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Flush function is called immediately after the isc_txd_encap function transmits
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a packet.
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It updates the hardware producer index or increments the descriptors used to
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pidx_or_credits in the queue designated by the qid number.
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This is often referred to as poking the doorbell register.
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.It Fn isc_txd_credits_update
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Credit function advances the buffer ring and calculates the credits
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(descriptors) processed.
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Until the I/O is complete it cleans the range in case of multisegments and
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updates the count of processed packets.
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The function returns the number of processed credits.
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.El
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.Ss Receive Packet Functions
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.Bl -ohang -offset indent
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.It Fn isc_rxd_available
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Function calculates the remaining number of descriptors from a position given
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by idx.
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The function returns this value.
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.It Fn isc_rxd_refill
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Starting with the physical address paddrs, the function reads a packet into the
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rx_ring until a value designated by count is reached.
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vaddrs is typically not needed and is provided for devices that place their own
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metadata in the packet header.
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.It Fn isc_rxd_flush
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Flush function updates the producer pointer on the free list flid in queue set
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number qid to pidx to reflect the presence of new buffers.
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.It Fn isc_rxd_pkt_get
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Process a single software descriptor.
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rxr->rx_base[i] contains a descriptor that describes a received packet.
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Hardware specific information about the buffer referred to by ri is returned in
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the data structure if_rxd_info
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.El
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.Sh SEE ALSO
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.Xr iflibdd 9 ,
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.Xr iflibdi 9 ,
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.Xr mbuf 9
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.Sh AUTHORS
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This manual page was written by
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.An Nicole Graziano
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