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| author | Arnd Bergmann <arnd@arndb.de> | 2012-08-23 17:02:42 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2012-08-23 17:02:42 +0200 |
| commit | 1e72fe1fca4490474984d6356bbf66e2daa89f73 (patch) | |
| tree | 12d95820cbb2083a6c78cfe550a0f9b20b1246eb /drivers/net/ethernet/sfc/tx.c | |
| parent | 8a211d362cc94df2bb42323ab13d258650529bec (diff) | |
| parent | a46d2619d7180bda12bad2bf15bbd0731dfc2dcf (diff) | |
Merge branch 'imx/fixes-for-3.6' of git://git.linaro.org/people/shawnguo/linux-2.6 into fixes
* 'imx/fixes-for-3.6' of git://git.linaro.org/people/shawnguo/linux-2.6:
ARM: dts: imx51-babbage: fix esdhc cd/wp properties
ARM: imx6: spin the cpu until hardware takes it down
ARM i.MX6q: Add virtual 1/3.5 dividers in the LDB clock path
Also updates to Linux 3.6-rc2
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/net/ethernet/sfc/tx.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/tx.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c index 9b225a7769f..18713436b44 100644 --- a/drivers/net/ethernet/sfc/tx.c +++ b/drivers/net/ethernet/sfc/tx.c @@ -119,6 +119,25 @@ efx_max_tx_len(struct efx_nic *efx, dma_addr_t dma_addr) return len; } +unsigned int efx_tx_max_skb_descs(struct efx_nic *efx) +{ + /* Header and payload descriptor for each output segment, plus + * one for every input fragment boundary within a segment + */ + unsigned int max_descs = EFX_TSO_MAX_SEGS * 2 + MAX_SKB_FRAGS; + + /* Possibly one more per segment for the alignment workaround */ + if (EFX_WORKAROUND_5391(efx)) + max_descs += EFX_TSO_MAX_SEGS; + + /* Possibly more for PCIe page boundaries within input fragments */ + if (PAGE_SIZE > EFX_PAGE_SIZE) + max_descs += max_t(unsigned int, MAX_SKB_FRAGS, + DIV_ROUND_UP(GSO_MAX_SIZE, EFX_PAGE_SIZE)); + + return max_descs; +} + /* * Add a socket buffer to a TX queue * |