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path: root/target/linux/cns3xxx/files/drivers/net/ethernet/cavium/cns3xxx_eth.c
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* cns3xxx: update to linux 3.10Felix Fietkau2014-07-311-29/+38
| | | | | | | | Signed-off-by: Felix Fietkau <nbd@openwrt.org> Backport of r41917 git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@41921 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: ethernet - revert: clean up tx descs only when neededFelix Fietkau2014-04-291-8/+4
| | | | | | | | | | | | | This reverts commit 0772ab938c0aedd7f4cc7127059d6ce8cf929dfa. Trying to optimize calls to eth_complete_tx in this fasion causes a regression where when sending only the tx queue can get disabled until a packet is received. This original call to eth_schedule_poll() is scheduled so it should not cause a performance issue. Signed-off-by: Tim Harvey <tharvey@gateworks.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40592 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: ethernet - clean up tx descs only when neededFelix Fietkau2014-02-271-4/+8
| | | | | | | | | | | We already clean up tx descriptors in the napi eth_poll() function so it would likely be rare to run out of available descriptors in eth_xmit. Thus we can clean them up only when needed and return busy only when we still don't have enough. Signed-off-by: Tim Harvey <tharvey@gateworks.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39762 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: ethernet - resolve SMP issueFelix Fietkau2014-02-271-2/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The combination of r35942 and r35952 causes an issue where eth_schedule_poll() can be called from a different CPU between the call to napi_complete() and the setting of cur_index which can break the rx ring accounting and cause ethernet latency and/or ethernet stalls. The issue can be easilly created by adding a couple of artificial delays such as: @@ -715,6 +715,7 @@ static int eth_poll(struct napi_struct *napi, int budget) if (!received) { napi_complete(napi); +udelay(1000); enable_irq(IRQ_CNS3XXX_SW_R0RXC); } @@ -727,6 +728,7 @@ static int eth_poll(struct napi_struct *napi, int budget) rx_ring->cur_index = i; wmb(); +udelay(1000); enable_rx_dma(sw); return received; This patch moves the setting of cur_index back up where it needs to be and addresses the original corner case that r35942 was trying to catch in an improved fashion by checking to see if the rx descriptor ring has become full before interrupts were re-enabled so that a poll can be scheduled again and avoid an rx stall caused by rx interrupts ceasing to fire again. Signed-off-by: Tim Harvey <tharvey@gateworks.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39761 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: ethernet - clean the tx ring before refilling the rx ring to reduce ↵Felix Fietkau2013-03-111-4/+4
| | | | | | memory pressure git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35953 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: ethernet - clean the tx ring only in the poll function, not in the ↵Felix Fietkau2013-03-111-6/+11
| | | | | | xmit handler git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35952 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: increase number of ethernet driver rx buffersFelix Fietkau2013-03-101-1/+1
| | | | git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35951 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: prevent the ethernet driver from accessing uninitialized dma ↵Felix Fietkau2013-03-101-1/+2
| | | | | | descriptor entries git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35950 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: minor ethernet driver cleanupFelix Fietkau2013-03-101-35/+19
| | | | git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35949 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: use kmalloc instead of kzalloc for ethernet rx buffersFelix Fietkau2013-03-101-1/+1
| | | | git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35943 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: fix an rx irq handling corner caseFelix Fietkau2013-03-101-5/+5
| | | | | | | | | | | | | | | | When an rx interrupt comes in, rx interrupts are disabled and NAPI polling is scheduled. During the NAPI poll, the driver first processes received frames in the ring, then fills the dma descriptor slots with new buffers and calls tx complete, before finally re-enabling rx interrupts and completing NAPI (if below the budget). If the hardware rx queue overflows before the napi complete is called, the hardware will not throw any further rx interrupts and rx processing stops completely. Fix this by keeping NAPI polling scheduled until it completes a poll without receiving any packets, and also handle NAPI completion before refilling rx or completing tx. git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35942 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: fix ethernet driver memory barrier usageFelix Fietkau2013-03-101-5/+8
| | | | git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35941 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: reduce buffer allocation size to 2048 bytes, improves ethernet ↵Felix Fietkau2013-03-101-1/+1
| | | | | | performance git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35917 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: add linux 3.8 support and use it by defaultFelix Fietkau2013-03-091-3/+3
| | | | git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35908 3c298f89-4303-0410-b956-a3cf2f4a3e73
* cns3xxx: convert ethernet patches to filesLuka Perkov2012-11-111-0/+1349
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34161 3c298f89-4303-0410-b956-a3cf2f4a3e73
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