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simplify the code to initialize the RDT while in netmap mode.

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This commit is contained in:
Luigi Rizzo 2013-05-09 16:57:02 +00:00
parent 39e499a8d2
commit 1405478115
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=250413
2 changed files with 9 additions and 20 deletions
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15
sys/dev/e1000/if_em.c
View file

@ -4333,6 +4333,8 @@ em_initialize_receive_unit(struct adapter *adapter)
for (int i = 0; i < adapter->num_queues; i++, rxr++) {
/* Setup the Base and Length of the Rx Descriptor Ring */
u32 rdt = adapter->num_rx_desc - 1; /* default */
bus_addr = rxr->rxdma.dma_paddr;
E1000_WRITE_REG(hw, E1000_RDLEN(i),
adapter->num_rx_desc * sizeof(struct e1000_rx_desc));
@ -4344,18 +4346,11 @@ em_initialize_receive_unit(struct adapter *adapter)
/*
* an init() while a netmap client is active must
* preserve the rx buffers passed to userspace.
* In this driver it means we adjust RDT to
* something different from na->num_rx_desc - 1.
*/
if (ifp->if_capenable & IFCAP_NETMAP) {
struct netmap_adapter *na = NA(adapter->ifp);
struct netmap_kring *kring = &na->rx_rings[i];
int t = na->num_rx_desc - 1 - kring->nr_hwavail;
E1000_WRITE_REG(hw, E1000_RDT(i), t);
} else
if (ifp->if_capenable & IFCAP_NETMAP)
rdt -= NA(adapter->ifp)->rx_rings[i].nr_hwavail;
#endif /* DEV_NETMAP */
E1000_WRITE_REG(hw, E1000_RDT(i), adapter->num_rx_desc - 1);
E1000_WRITE_REG(hw, E1000_RDT(i), rdt);
}
/* Set PTHRESH for improved jumbo performance */

14
sys/dev/e1000/if_lem.c
View file

@ -3361,19 +3361,13 @@ lem_initialize_receive_unit(struct adapter *adapter)
* Tail Descriptor Pointers
*/
E1000_WRITE_REG(&adapter->hw, E1000_RDH(0), 0);
rctl = adapter->num_rx_desc - 1; /* default RDT value */
#ifdef DEV_NETMAP
/* preserve buffers already made available to clients */
if (ifp->if_capenable & IFCAP_NETMAP) {
struct netmap_adapter *na = NA(adapter->ifp);
struct netmap_kring *kring = &na->rx_rings[0];
int t = na->num_rx_desc - 1 - kring->nr_hwavail;
if (t >= na->num_rx_desc)
t -= na->num_rx_desc;
E1000_WRITE_REG(&adapter->hw, E1000_RDT(0), t);
} else
if (ifp->if_capenable & IFCAP_NETMAP)
rctl -= NA(adapter->ifp)->rx_rings[0].nr_hwavail;
#endif /* DEV_NETMAP */
E1000_WRITE_REG(&adapter->hw, E1000_RDT(0), adapter->num_rx_desc - 1);
E1000_WRITE_REG(&adapter->hw, E1000_RDT(0), rctl);
return;
}