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[gve] Remove separate concept of "packet descriptor"

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The Linux driver occasionally uses the terminology "packet descriptor"
to refer to the portion of the descriptor excluding the buffer
address.  This is not a helpful separation, and merely adds
complexity.

Simplify the code by removing this artifical separation.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-09-29 14:45:32 +01:00
parent ee9aea7893
commit 610089b98e
2 changed files with 25 additions and 37 deletions
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34
src/drivers/net/gve.c
View File

@@ -1283,19 +1283,19 @@ static int gve_transmit ( struct net_device *netdev, struct io_buffer *iobuf ) {
/* Populate descriptor */
index = ( tx->prod++ & ( tx->count - 1 ) );
desc = &tx->desc.tx[index];
memset ( &desc->pkt, 0, sizeof ( desc->pkt ) );
if ( offset ) {
desc->pkt.type = GVE_TX_TYPE_CONT;
desc->type = GVE_TX_TYPE_CONT;
desc->count = 0;
desc->total = 0;
} else {
desc->pkt.type = GVE_TX_TYPE_START;
desc->pkt.count = count;
desc->pkt.total = cpu_to_be16 ( len );
desc->type = GVE_TX_TYPE_START;
desc->count = count;
desc->total = cpu_to_be16 ( len );
}
desc->pkt.len = cpu_to_be16 ( frag_len );
desc->len = cpu_to_be16 ( frag_len );
DBGC2 ( gve, "GVE %p TX %#04x %#02x:%#02x len %#04x/%#04x at "
"%#08zx\n", gve, index, desc->pkt.type,
desc->pkt.count, be16_to_cpu ( desc->pkt.len ),
be16_to_cpu ( desc->pkt.total ),
"%#08zx\n", gve, index, desc->type, desc->count,
be16_to_cpu ( desc->len ), be16_to_cpu ( desc->total ),
gve_address ( tx, index ) );
}
assert ( ( tx->prod - tx->cons ) <= tx->fill );
@@ -1363,22 +1363,22 @@ static void gve_poll_rx ( struct net_device *netdev ) {
cmplt = &rx->cmplt.rx[index];
/* Check sequence number */
if ( ( cmplt->pkt.seq & GVE_RX_SEQ_MASK ) != seq )
if ( ( cmplt->seq & GVE_RX_SEQ_MASK ) != seq )
break;
seq = gve_next ( seq );
/* Parse completion */
len = be16_to_cpu ( cmplt->pkt.len );
len = be16_to_cpu ( cmplt->len );
DBGC2 ( gve, "GVE %p RX %#04x %#02x:%#02x len %#04zx at "
"%#08zx\n", gve, index, cmplt->pkt.seq,
cmplt->pkt.flags, len, gve_address ( rx, index ) );
"%#08zx\n", gve, index, cmplt->seq, cmplt->flags,
len, gve_address ( rx, index ) );
/* Accumulate a complete packet */
if ( cmplt->pkt.flags & GVE_RXF_ERROR ) {
if ( cmplt->flags & GVE_RXF_ERROR ) {
total = 0;
} else {
total += len;
if ( cmplt->pkt.flags & GVE_RXF_MORE )
if ( cmplt->flags & GVE_RXF_MORE )
continue;
}
gve->seq = seq;
@@ -1393,7 +1393,7 @@ static void gve_poll_rx ( struct net_device *netdev ) {
/* Copy data */
if ( iobuf ) {
len = be16_to_cpu ( cmplt->pkt.len );
len = be16_to_cpu ( cmplt->len );
memcpy ( iob_put ( iobuf, len ),
gve_buffer ( rx, rx->cons ), len );
}
@@ -1406,7 +1406,7 @@ static void gve_poll_rx ( struct net_device *netdev ) {
iob_pull ( iobuf, GVE_RX_PAD );
netdev_rx ( netdev, iobuf );
} else {
rc = ( ( cmplt->pkt.flags & GVE_RXF_ERROR ) ?
rc = ( ( cmplt->flags & GVE_RXF_ERROR ) ?
-EIO : -ENOMEM );
netdev_rx_err ( netdev, NULL, rc );
}

28
src/drivers/net/gve.h
View File

@@ -524,8 +524,8 @@ struct gve_buffer {
uint64_t addr;
} __attribute__ (( packed ));
/** A transmit packet descriptor */
struct gve_tx_packet {
/** A transmit descriptor */
struct gve_tx_descriptor {
/** Type */
uint8_t type;
/** Reserved */
@@ -536,12 +536,6 @@ struct gve_tx_packet {
uint16_t total;
/** Length of this descriptor */
uint16_t len;
} __attribute__ (( packed ));
/** A transmit descriptor */
struct gve_tx_descriptor {
/** Packet descriptor */
struct gve_tx_packet pkt;
/** Buffer descriptor */
struct gve_buffer buf;
} __attribute__ (( packed ));
@@ -573,16 +567,6 @@ struct gve_rx_descriptor {
struct gve_buffer buf;
} __attribute__ (( packed ));
/** A receive packet descriptor */
struct gve_rx_packet {
/** Length */
uint16_t len;
/** Flags */
uint8_t flags;
/** Sequence number */
uint8_t seq;
} __attribute__ (( packed ));
/** Receive error */
#define GVE_RXF_ERROR 0x08
@@ -596,8 +580,12 @@ struct gve_rx_packet {
struct gve_rx_completion {
/** Reserved */
uint8_t reserved[60];
/** Packet descriptor */
struct gve_rx_packet pkt;
/** Length */
uint16_t len;
/** Flags */
uint8_t flags;
/** Sequence number */
uint8_t seq;
} __attribute__ (( packed ));
/** Padding at the start of all received packets */