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sfc: Refactor struct efx_tx_buffer to use a flags field

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Add a flags field to struct efx_tx_buffer, replacing the
continuation and map_single booleans.

Since a single descriptor cannot be both a TSO header and the last
descriptor for an skb, unionise efx_tx_buffer::{skb,tsoh} and add
flags for validity of these fields.

Clear all flags in free buffers (whereas previously the continuation
flag would be set).

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2012-05-17 20:52:20 +01:00
parent 8f4cccbbd9
commit 7668ff9c2a
3 changed files with 53 additions and 56 deletions
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4
drivers/net/ethernet/sfc/nic.c
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@ -401,8 +401,10 @@ void efx_nic_push_buffers(struct efx_tx_queue *tx_queue)
++tx_queue->write_count;
/* Create TX descriptor ring entry */
BUILD_BUG_ON(EFX_TX_BUF_CONT != 1);
EFX_POPULATE_QWORD_4(*txd,
FSF_AZ_TX_KER_CONT, buffer->continuation,
FSF_AZ_TX_KER_CONT,
buffer->flags & EFX_TX_BUF_CONT,
FSF_AZ_TX_KER_BYTE_COUNT, buffer->len,
FSF_AZ_TX_KER_BUF_REGION, 0,
FSF_AZ_TX_KER_BUF_ADDR, buffer->dma_addr);