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sfc: Stop TX queues before they fill up

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We now have a definite upper bound on the number of descriptors per
skb; use that to stop the queue when the next packet might not fit.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings
2012-05-22 01:27:58 +01:00
parent 7668ff9c2a
commit 14bf718fb9
3 changed files with 112 additions and 115 deletions
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5
drivers/net/ethernet/sfc/net_driver.h
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@@ -665,6 +665,8 @@ struct vfdi_status;
* should be allocated for this NIC
* @rxq_entries: Size of receive queues requested by user.
* @txq_entries: Size of transmit queues requested by user.
* @txq_stop_thresh: TX queue fill level at or above which we stop it.
* @txq_wake_thresh: TX queue fill level at or below which we wake it.
* @tx_dc_base: Base qword address in SRAM of TX queue descriptor caches
* @rx_dc_base: Base qword address in SRAM of RX queue descriptor caches
* @sram_lim_qw: Qword address limit of SRAM
@@ -775,6 +777,9 @@ struct efx_nic {
unsigned rxq_entries;
unsigned txq_entries;
unsigned int txq_stop_thresh;
unsigned int txq_wake_thresh;
unsigned tx_dc_base;
unsigned rx_dc_base;
unsigned sram_lim_qw;