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sfc: Add support for reading packet length from prefix

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Define a flag for struct efx_rx_buffer and efx_rx_packet() that
indicates packet length must be read from the prefix.  If this
is set, read the length in __efx_rx_packet() (when the prefix
should have arrived in cache).

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2013-04-27 01:55:18 +01:00
parent 02e121650b
commit 3dced740c2
2 changed files with 14 additions and 2 deletions
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4
drivers/net/ethernet/sfc/net_driver.h
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@ -263,6 +263,7 @@ struct efx_rx_buffer {
#define EFX_RX_PKT_CSUMMED 0x0002
#define EFX_RX_PKT_DISCARD 0x0004
#define EFX_RX_PKT_TCP 0x0040
#define EFX_RX_PKT_PREFIX_LEN 0x0080 /* length is in prefix only */
/**
* struct efx_rx_page_state - Page-based rx buffer state
@ -668,6 +669,8 @@ struct vfdi_status;
* @rx_prefix_size: Size of RX prefix before packet data
* @rx_packet_hash_offset: Offset of RX flow hash from start of packet data
* (valid only if @rx_prefix_size != 0; always negative)
* @rx_packet_len_offset: Offset of RX packet length from start of packet data
* (valid only for NICs that set %EFX_RX_PKT_PREFIX_LEN; always negative)
* @rx_hash_key: Toeplitz hash key for RSS
* @rx_indir_table: Indirection table for RSS
* @rx_scatter: Scatter mode enabled for receives
@ -800,6 +803,7 @@ struct efx_nic {
unsigned int rx_pages_per_batch;
unsigned int rx_prefix_size;
int rx_packet_hash_offset;
int rx_packet_len_offset;
u8 rx_hash_key[40];
u32 rx_indir_table[128];
bool rx_scatter;