From 5e848e4c5d77438e126c97702ec3bea477f550a9 Mon Sep 17 00:00:00 2001 From: Sunil Goutham Date: Tue, 2 May 2017 18:36:51 +0530 Subject: 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 Signed-off-by: David S. Miller --- drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 8 ++++---- drivers/net/ethernet/cavium/thunder/q_struct.h | 10 +--------- 2 files changed, 5 insertions(+), 13 deletions(-) (limited to 'drivers/net') diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c index 12f9709bb180..dfc85a169127 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 f36347237a54..e47205aa87ea 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 */ -- cgit v1.2.3