14  * 1) Allocates TX WQE array using coherent DMA mapping
15  * 2) Allocates TX completion counter using coherent DMA mapping
30 	/* Write TX WQE base address into MMIO reg */  in mlxbf_gige_tx_init()
33 	/* Allocate address for TX completion count */  in mlxbf_gige_tx_init()
42 	/* Write TX CC base address into MMIO reg */  in mlxbf_gige_tx_init()
56  * namely the TX WQE array and the TX completion counter
92 /* Function that returns status of TX ring:
93  *          0: TX ring is full, i.e. there are no
94  *             available un-used entries in TX ring.
95  *   non-null: TX ring is not full, i.e. there are
96  *             some available entries in TX ring.
98  *             how many TX entries are available, but
103  * (prev_tx_ci == tx_pi) then the TX ring is empty.
141 	 * index (in SW) equals TX consumer index (from HW).  These  in mlxbf_gige_handle_tx_complete()
143 	 * to be supported, that is TX consumer index wrapped from 0xFFFF  in mlxbf_gige_handle_tx_complete()
144 	 * to 0 while TX completion index is still < 0xFFFF.  in mlxbf_gige_handle_tx_complete()
148 		/* Each TX WQE is 16 bytes. The 8 MSB store the 2KB TX  in mlxbf_gige_handle_tx_complete()
150 		 * about the TX WQE.  in mlxbf_gige_handle_tx_complete()
167 	/* Since the TX ring was likely just drained, check if TX queue  in mlxbf_gige_handle_tx_complete()
168 	 * had previously been stopped and now that there are TX buffers  in mlxbf_gige_handle_tx_complete()
169 	 * available the TX queue can be awakened.  in mlxbf_gige_handle_tx_complete()
178 /* Function to advance the tx_wqe_next pointer to next TX WQE */
184 	/* Check if 'next' pointer is beyond end of TX ring */  in mlxbf_gige_update_tx_wqe_next()
202 	/* If needed, linearize TX SKB as hardware DMA expects this */  in mlxbf_gige_start_xmit()
242 	/* Get address of TX WQE */  in mlxbf_gige_start_xmit()
247 	/* Put PA of buffer address into first 64-bit word of TX WQE */  in mlxbf_gige_start_xmit()
250 	/* Set TX WQE pkt_len appropriately  in mlxbf_gige_start_xmit()
256 	/* Write entire 2nd word of TX WQE */  in mlxbf_gige_start_xmit()
265 		/* Create memory barrier before write to TX PI */  in mlxbf_gige_start_xmit()
270 	/* Check if the last TX entry was just used */  in mlxbf_gige_start_xmit()
272 		/* TX ring is full, inform stack */  in mlxbf_gige_start_xmit()
275 		/* Since there is no separate "TX complete" interrupt, need  in mlxbf_gige_start_xmit()
277 		 * which processes TX completions, and will hopefully drain  in mlxbf_gige_start_xmit()
278 		 * the TX ring allowing the TX queue to be awakened.  in mlxbf_gige_start_xmit()