diff options
| author | Bert Kenward <bkenward@solarflare.com> | 2016-11-17 10:51:54 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-18 11:55:38 -0500 |
| commit | e9117e5099ea29592c2a6180f368951948837a8b (patch) | |
| tree | 865d0862309b88b06a249b3cc949aee1589ba7ef /drivers/net/ethernet/sfc/farch.c | |
| parent | e17705c43b4273d2587297d5f8168ee432d9c94a (diff) | |
| download | linux-e9117e5099ea29592c2a6180f368951948837a8b.tar.bz2 | |
sfc: Firmware-Assisted TSO version 2
Add support for FATSOv2 to the driver. FATSOv2 offloads far more of the task
of TCP segmentation to the firmware, such that we now just pass a single
super-packet to the NIC. This means TSO has a great deal in common with a
normal DMA transmit, apart from adding a couple of option descriptors.
NIC-specific checks have been moved off the fast path and in to
initialisation where possible.
This also moves FATSOv1/SWTSO to a new file (tx_tso.c). The end of transmit
and some error handling is now outside TSO, since it is common with other
code.
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sfc/farch.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/farch.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/farch.c b/drivers/net/ethernet/sfc/farch.c index 4762ec444cb8..3d5b91bc4ce6 100644 --- a/drivers/net/ethernet/sfc/farch.c +++ b/drivers/net/ethernet/sfc/farch.c @@ -356,6 +356,21 @@ void efx_farch_tx_write(struct efx_tx_queue *tx_queue) } } +unsigned int efx_farch_tx_limit_len(struct efx_tx_queue *tx_queue, + dma_addr_t dma_addr, unsigned int len) +{ + /* Don't cross 4K boundaries with descriptors. */ + unsigned int limit = (~dma_addr & (EFX_PAGE_SIZE - 1)) + 1; + + len = min(limit, len); + + if (EFX_WORKAROUND_5391(tx_queue->efx) && (dma_addr & 0xf)) + len = min_t(unsigned int, len, 512 - (dma_addr & 0xf)); + + return len; +} + + /* Allocate hardware resources for a TX queue */ int efx_farch_tx_probe(struct efx_tx_queue *tx_queue) { |