diff options
| author | Sunil Goutham <sgoutham@cavium.com> | 2017-05-02 18:36:51 +0530 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-05-02 15:41:20 -0400 |
| commit | 5e848e4c5d77438e126c97702ec3bea477f550a9 (patch) | |
| tree | 247528970eb0abd195b637de07eabdf45034e13f /drivers/net/ethernet/cavium/thunder | |
| parent | 5836b4429777bf57ca8fc02b154263aa54d97508 (diff) | |
| download | op-kernel-dev-5e848e4c5d77438e126c97702ec3bea477f550a9.zip op-kernel-dev-5e848e4c5d77438e126c97702ec3bea477f550a9.tar.gz | |
net: thunderx: Optimize RBDR descriptor handling
Receive buffer's physical address or iova will anyway not
go beyond 49bits, since it is the max supported HW address.
As per perf, updating bitfields i.e buf_addr:42 in RBDR
descriptor entry consumes lots of cpu cycles, hence changed
it to a 64bit field with alignment requirements taken care of.
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/cavium/thunder')
| -rw-r--r-- | drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 8 | ||||
| -rw-r--r-- | drivers/net/ethernet/cavium/thunder/q_struct.h | 10 |
2 files changed, 5 insertions, 13 deletions
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c index 12f9709..dfc85a1 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c @@ -257,7 +257,7 @@ static int nicvf_init_rbdr(struct nicvf *nic, struct rbdr *rbdr, } desc = GET_RBDR_DESC(rbdr, idx); - desc->buf_addr = (u64)rbuf >> NICVF_RCV_BUF_ALIGN; + desc->buf_addr = (u64)rbuf & ~(NICVF_RCV_BUF_ALIGN_BYTES - 1); } nicvf_get_page(nic); @@ -286,7 +286,7 @@ static void nicvf_free_rbdr(struct nicvf *nic, struct rbdr *rbdr) /* Release page references */ while (head != tail) { desc = GET_RBDR_DESC(rbdr, head); - buf_addr = ((u64)desc->buf_addr) << NICVF_RCV_BUF_ALIGN; + buf_addr = desc->buf_addr; phys_addr = nicvf_iova_to_phys(nic, buf_addr); dma_unmap_page_attrs(&nic->pdev->dev, buf_addr, RCV_FRAG_LEN, DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC); @@ -297,7 +297,7 @@ static void nicvf_free_rbdr(struct nicvf *nic, struct rbdr *rbdr) } /* Release buffer of tail desc */ desc = GET_RBDR_DESC(rbdr, tail); - buf_addr = ((u64)desc->buf_addr) << NICVF_RCV_BUF_ALIGN; + buf_addr = desc->buf_addr; phys_addr = nicvf_iova_to_phys(nic, buf_addr); dma_unmap_page_attrs(&nic->pdev->dev, buf_addr, RCV_FRAG_LEN, DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC); @@ -364,7 +364,7 @@ refill: break; desc = GET_RBDR_DESC(rbdr, tail); - desc->buf_addr = (u64)rbuf >> NICVF_RCV_BUF_ALIGN; + desc->buf_addr = (u64)rbuf & ~(NICVF_RCV_BUF_ALIGN_BYTES - 1); refill_rb_cnt--; new_rb++; } diff --git a/drivers/net/ethernet/cavium/thunder/q_struct.h b/drivers/net/ethernet/cavium/thunder/q_struct.h index f363472..e47205a 100644 --- a/drivers/net/ethernet/cavium/thunder/q_struct.h +++ b/drivers/net/ethernet/cavium/thunder/q_struct.h @@ -359,15 +359,7 @@ union cq_desc_t { }; struct rbdr_entry_t { -#if defined(__BIG_ENDIAN_BITFIELD) - u64 rsvd0:15; - u64 buf_addr:42; - u64 cache_align:7; -#elif defined(__LITTLE_ENDIAN_BITFIELD) - u64 cache_align:7; - u64 buf_addr:42; - u64 rsvd0:15; -#endif + u64 buf_addr; }; /* TCP reassembly context */ |
