Various RX performance tweaks, do some explicit prefetching of packet data, etc. Signed-off-by: Olof Johansson Index: mainline/drivers/net/pasemi_mac.c =================================================================== --- mainline.orig/drivers/net/pasemi_mac.c +++ mainline/drivers/net/pasemi_mac.c @@ -481,6 +481,7 @@ static int pasemi_mac_clean_rx(struct pa rmb(); dp = &RX_DESC(mac, n); + prefetchw(dp); macrx = dp->macrx; if (!(macrx & XCT_MACRX_O)) @@ -502,8 +503,10 @@ static int pasemi_mac_clean_rx(struct pa if (info->dma == dma) break; } + prefetchw(info); skb = info->skb; + prefetchw(skb); info->dma = 0; pci_unmap_single(mac->dma_pdev, dma, skb->len, @@ -526,9 +529,7 @@ static int pasemi_mac_clean_rx(struct pa skb_put(skb, len); - skb->protocol = eth_type_trans(skb, mac->netdev); - - if ((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) { + if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) { skb->ip_summed = CHECKSUM_COMPLETE; skb->csum = (macrx & XCT_MACRX_CSUM_M) >> XCT_MACRX_CSUM_S; @@ -538,6 +539,7 @@ static int pasemi_mac_clean_rx(struct pa mac->stats.rx_bytes += len; mac->stats.rx_packets++; + skb->protocol = eth_type_trans(skb, mac->netdev); netif_receive_skb(skb); dp->ptr = 0; @@ -569,7 +571,7 @@ static int pasemi_mac_clean_tx(struct pa for (i = start; i < mac->tx->next_to_use; i++) { dp = &TX_DESC(mac, i); - if (!dp || (dp->mactx & XCT_MACTX_O)) + if (unlikely(dp->mactx & XCT_MACTX_O)) break; count++; @@ -957,7 +959,7 @@ static int pasemi_mac_start_tx(struct sk struct pasemi_mac_txring *txring; struct pasemi_mac_buffer *info; struct pas_dma_xct_descr *dp; - u64 dflags; + u64 dflags, mactx, ptr; dma_addr_t map; int flags; @@ -985,6 +987,9 @@ static int pasemi_mac_start_tx(struct sk if (dma_mapping_error(map)) return NETDEV_TX_BUSY; + mactx = dflags | XCT_MACTX_LLEN(skb->len); + ptr = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map); + txring = mac->tx; spin_lock_irqsave(&txring->lock, flags); @@ -1005,12 +1010,11 @@ static int pasemi_mac_start_tx(struct sk } } - dp = &TX_DESC(mac, txring->next_to_use); info = &TX_DESC_INFO(mac, txring->next_to_use); - dp->mactx = dflags | XCT_MACTX_LLEN(skb->len); - dp->ptr = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map); + dp->mactx = mactx; + dp->ptr = ptr; info->dma = map; info->skb = skb; -- - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html