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nvethernet: use maximum transmit buffer size

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1) Removes the limitation of 4KB per descriptor.
2) Adds maximum transmit buffer size as 0x3FFF.
3) Changes descripors threshold considering TSO/GSO.

Bug 200542488

Change-Id: Ic32d5e1e49df48b0da057349f8300d029410d322
Signed-off-by: Bhadram Varka <vbhadram@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2174519
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Bhadram Varka
2019-08-13 19:54:46 +05:30
committed by Revanth Kumar Uppala
parent 9c4438324c
commit e4f82ebb78
3 changed files with 17 additions and 11 deletions
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18
drivers/net/ethernet/nvidia/nvethernet/ether_linux.h
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@@ -120,14 +120,20 @@
/**
* @brief Maximum buffer length per DMA descriptor (4KB).
*/
#define ETHER_MAX_DATA_LEN_PER_TXD_BUF BIT(12)
#define ETHER_TX_MAX_BUFF_SIZE 0x3FFF
/**
* @brief In-case of TSO/GSO, Tx ring needs atleast MAX_SKB_FRAGS +
* one context descriptor +
* one descriptor for header/linear buffer payload
/* Descriptors required for maximum contiguous TSO/GSO packet
* one extra descriptor if there is linear buffer payload
*/
#define TX_DESC_THRESHOLD (MAX_SKB_FRAGS + 2)
#define ETHER_TX_MAX_SPLIT ((GSO_MAX_SIZE / ETHER_TX_MAX_BUFF_SIZE) + 1)
/* Maximum possible descriptors needed for an SKB:
* - Maximum number of SKB frags
* - Maximum descriptors for contiguous TSO/GSO packet
* - Possible context descriptor
* - Possible TSO header descriptor
*/
#define ETHER_TX_DESC_THRESHOLD (MAX_SKB_FRAGS + ETHER_TX_MAX_SPLIT + 2)
/**
*@brief Returns count of available transmit descriptors